CN111977894A - Domestic sewage treatment system and control method - Google Patents

Abstract

A domestic sewage treatment system and a control method, the system comprises a buffer device, a decomposition device, a reuse device and an output device; the buffer device stores the received domestic sewage, and filters out floating objects larger than a preset volume; The buffer device filters out the treated domestic sewage, performs preliminary precipitation treatment, and then performs hydrolysis reaction and acidification reaction to decompose organic solids and predetermined types of organic matter into small-molecule-soluble organic pollutants; Convert it into ammonia nitrogen, and then remove ammonia nitrogen through aerobic nitrification and anoxic denitrification; the recycling device performs solid-liquid separation treatment on the domestic sewage treated by the decomposition device to obtain exfoliated biofilm and domestic sewage; the exfoliated biofilm is input to decomposition The device reuses the sludge, disinfects the domestic sewage and outputs it; the output device filters the domestic sewage output by the recycling device with activated carbon and outputs it to the external water use mechanism.

Description

Domestic sewage treatment system and control method

technical field

The invention relates to the field of environmental treatment, in particular to a domestic sewage treatment system and a control method.

Background technique

The domestic sewage in the industrial plant area mainly comes from the drainage of workshops, production, administrative office buildings, baths, canteens and toilets of other ancillary buildings. Main water quality indicators in the domestic sewage in the factory area: BOD ₅ (100-200mg/L), SS (150-200mg/L), COD (200-400mg/L), NH ₃ -N (30-40mg/L), pH ( 6 to 9). Compared with the typical domestic sewage water quality indicators, the indicators of domestic sewage in the production area are in the lower range. However, with the further implementation of the national zero-discharge policy of wastewater, the factory, as a relatively independent industrial production and living area, realizes the recycling and reuse of water resources in the production area, so as to achieve ultra-low or even zero discharge of sewage. The destination of the domestic sewage in the factory area after treatment is designed to be water for greening and spraying. According to the characteristics of domestic sewage in industrial production areas, advanced treatment of domestic sewage is carried out, so that the water quality index reaches the standard of green water for sewage reuse. Therefore, it is urgent in the industry to research and develop a domestic sewage treatment system suitable for the factory area, which can be equipped with a computer DCS control method with increasingly powerful data processing to complete automatic sewage treatment, and provide a system and method for automatic, coordinated, and continuous operation control of the sewage treatment system. .

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a domestic sewage treatment system and a control method, and the use of the system and the control method can improve the domestic sewage treatment efficiency and reduce the operation cost.

In order to achieve the above purpose, the domestic sewage treatment system provided by the present invention includes a buffer device, a decomposition device, a reuse device and an output device; the buffer device is used to store the received domestic sewage and filter out the Floating matter larger than a preset volume in the domestic sewage; the decomposition device is used to perform preliminary precipitation treatment on the domestic sewage filtered and treated by the buffer device, perform hydrolysis reaction and acidification reaction on the treated domestic sewage, and decompose the domestic sewage. The organic solids and predetermined types of organic matter in the plant are decomposed into small-molecule-soluble organic pollutants; the organic pollutants are converted into ammonia nitrogen through the metabolism of membrane organisms, and then removed through aerobic nitrification and anoxic denitrification processes. Ammonia nitrogen, output the domestic sewage after the ammonia nitrogen is removed; the reuse device is used to perform solid-liquid separation treatment on the domestic sewage treated by the decomposition device to obtain detached biofilm and domestic sewage; input the detached biofilm The sludge is reused in the decomposition device, and the domestic sewage obtained by the separation treatment is disinfected and then output; the output device is used to filter the domestic sewage output by the recycling device with activated carbon and then output it to an external water use mechanism.

In the above-mentioned domestic sewage treatment system, preferably, the buffer device includes a grid well and a regulating tank; the grid well is used to filter out floating objects larger than a preset volume in the domestic sewage; The domestic sewage after the grid well has been filtered to filter the floating objects is stored to provide stable water quality and quantity for the decomposition device.

In the above-mentioned domestic sewage treatment system, preferably, the decomposition device includes a primary sedimentation tank, an anaerobic hydrolysis tank, a primary contact oxidation tank, and a secondary contact oxidation tank; the primary sedimentation tank is connected to the buffer device, and uses The anaerobic hydrolysis tank is connected with the primary sedimentation tank, and is used for hydrolysis and preliminary sedimentation of the domestic sewage treated by the primary sedimentation tank. The acidification reaction decomposes the organic solids and predetermined types of organic matter in the domestic sewage into small-molecule dissolved organic matter; the first-stage contact oxidation tank is connected with the anaerobic hydrolysis tank, and the second-stage contact oxidation tank is connected with the first-stage contact oxidation tank. The first-level contact oxidation tank and the second-level contact oxidation tank are used to convert the organic pollutants in the domestic sewage treated by the anaerobic hydrolysis tank into ammonia nitrogen through the metabolism of membrane organisms, The ammonia nitrogen is then removed through aerobic nitrification and anoxic denitrification processes.

In the above-mentioned domestic sewage treatment system, preferably, the recycling device includes a secondary sedimentation tank, a disinfection tank and a sludge tank; the secondary sedimentation tank is respectively connected with the secondary contact oxidation tank and the anaerobic hydrolysis tank , used for solid-liquid separation treatment of the domestic sewage treated in the secondary contact oxidation tank to obtain sludge, shed biofilm and domestic sewage; input the shed biofilm into the anaerobic hydrolysis tank for sludge treatment Reuse; the disinfection tank is connected with the secondary sedimentation tank, and is used to disinfect the domestic sewage treated by the secondary sedimentation tank; the sludge tank is respectively connected with the secondary sedimentation tank and the primary sedimentation tank connected to each other for storing the sludge separated by the secondary sedimentation tank, and inputting the domestic sewage overflowing from the sludge precipitation to the primary sedimentation tank.

In the above-mentioned domestic sewage treatment system, preferably, the system further comprises an aeration fan, and the aeration fan is connected to the primary sedimentation tank, the primary contact oxidation tank, the secondary contact oxidation tank and the The recycling device is connected to the precipitation treatment of the domestic sewage in the decomposition device, and the organic pollutants are converted into ammonia nitrogen and the domestic sewage in the ammonia nitrogen removal stage is subjected to aeration treatment; and, the output device is used for aeration treatment. The domestic sewage that is filtered by activated carbon is subjected to aeration treatment.

In the above-mentioned domestic sewage treatment system, preferably, the system further includes a rotating mechanical group, and the rotating mechanical group includes a sewage lifting pump, a sludge return pump, an intermediate water pump and a recycling water pump; the sewage lifting pump is used to The domestic sewage stored in the buffer device is pumped into the decomposition device; the sludge return pump is used to pump the shed biofilm into the decomposition device for sludge reuse; the intermediate water pump is used to The sterilized domestic sewage in the recycling device is pumped into the output device for activated carbon filtration; the recycling water pump is used to pump the domestic sewage filtered by the activated carbon in the output device into an external water-use mechanism and / or pumped into the activated carbon filtering equipment in the output device to provide backwash water.

In the above-mentioned domestic sewage treatment system, preferably, the system further includes a control device, and the control device includes a sewage lift pump control module, an aeration fan control module, a sludge return pump control module and a reuse water pump control module; The sewage lifting pump control module is used to start the sewage lifting pump to pump domestic sewage into the decomposition device when the domestic sewage stored in the buffer device is higher than the first predetermined water amount; When the domestic sewage is lower than the second predetermined water volume, the sewage lifting pump is turned off, and the domestic sewage is stopped to be pumped into the decomposition device; the aeration fan control module is used to control the aeration fan according to the received control command. Carry out aeration treatment on the preliminary precipitation treatment of domestic sewage in the decomposition device, convert the organic pollutants into ammonia nitrogen and remove the domestic sewage in the ammonia nitrogen stage; and/or, filter the activated carbon in the output device. The domestic sewage is subjected to aeration treatment; the sludge return pump control module is configured to control the sludge return pump to start running for a second time period after the sewage lift pump operates for a first time period; After the sewage lift pump stops running, stop the sludge return pump; the reuse water pump control module is used to control the reuse water pump according to the received control command to filter the domestic sewage filtered by the activated carbon in the output device Backwash water is provided by pumping to an external water use mechanism and/or pumping to an activated carbon filter in the output device.

The present invention also provides a control method for a domestic sewage treatment system, the method comprising: receiving domestic sewage and filtering out floating objects larger than a preset volume in the domestic sewage; performing preliminary sedimentation treatment on the domestic sewage, and treating the treated sewage The domestic sewage undergoes a hydrolysis reaction and an acidification reaction to decompose the organic solids and predetermined types of organic substances in the domestic sewage into small-molecule-soluble organic pollutants; the organic pollutants are converted into ammonia nitrogen through the metabolism of membrane organisms, and then pass through The ammonia nitrogen is removed by aerobic nitrification and anoxic denitrification; the solid-liquid separation treatment is performed on the domestic sewage after removing the ammonia nitrogen to obtain a detached biofilm and domestic sewage; the detached biofilm is returned for reuse, and the separation treatment is performed The obtained domestic sewage is disinfected and then filtered with activated carbon to obtain output water; the output water is output to an external water use mechanism.

In the above control method, preferably, the method further comprises: in the process of preliminary precipitation treatment of domestic sewage, converting the organic pollutants into ammonia nitrogen and removing the ammonia nitrogen, performing aeration treatment on the domestic sewage and, performing air aeration treatment on the domestic sewage during the activated carbon filtration process of the domestic sewage.

In the above control method, preferably, the method further includes: when the domestic sewage stored in the buffer device is higher than a first predetermined amount of water, pumping domestic sewage into the decomposition device; when the buffer device stores domestic sewage; When the domestic sewage is lower than the second predetermined amount of water, the pumping of domestic sewage into the decomposition device is stopped.

In the above control method, preferably, outputting the output water to an external water use mechanism further comprises: providing backwash water for the activated carbon filter device through the output water.

The present invention also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and running on the processor, the processor implementing the above method when the computer program is executed.

The present invention also provides a computer-readable storage medium storing a computer program for executing the above method.

The beneficial technical effects of the present invention are as follows: the coordinated, continuous and automatic operation of functions such as sewage lifting, aeration, sludge return, filter operation backwashing, and purified water reuse in domestic sewage treatment is realized, the efficiency of domestic sewage treatment is improved, and the running costs.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present application, and do not constitute a limitation to the present invention. In the attached image:

1 is a schematic diagram of the principle of a domestic sewage treatment system provided by an embodiment of the present invention;

2 is a schematic diagram of an application structure of a domestic sewage treatment system provided by an embodiment of the present invention;

3 is a schematic flowchart of a control method of a domestic sewage treatment system provided by an embodiment of the present invention;

4 is a schematic diagram of a working logic flow diagram of an aeration fan provided by an embodiment of the present invention;

FIG. 5 is a schematic flowchart of the working logic of the domestic sewage lift pump provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of the working logic of the sludge return pump provided by an embodiment of the present invention;

FIG. 7 is a schematic flow chart of the working logic of the reuse water pump provided by an embodiment of the present invention;

FIG. 8 is a schematic flowchart of the working logic of an activated carbon filter provided by an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so as to fully understand and implement the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects. It should be noted that, as long as there is no conflict, each embodiment of the present invention and each feature of each embodiment can be combined with each other, and the formed technical solutions all fall within the protection scope of the present invention.

Additionally, the steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although shown in a logical order in the flowcharts, in some cases, may be executed differently The steps shown or described are performed in the order shown herein.

Please refer to FIG. 1 , a domestic sewage treatment system provided by the present invention, the system includes a buffer device, a decomposition device, a recycling device and an output device; the buffer device is used for storing received The domestic sewage is filtered out, and the floating objects larger than the preset volume in the domestic sewage are filtered out; the decomposition device is used to perform preliminary precipitation treatment on the domestic sewage filtered and treated by the buffer device, and the treated domestic sewage is used for preliminary precipitation treatment. Hydrolysis reaction and acidification reaction, decompose organic solids and predetermined types of organic substances in domestic sewage into small-molecule-soluble organic pollutants; through the metabolism of membrane organisms, the organic pollutants are converted into ammonia nitrogen, and then through aerobic nitrification and the anoxic denitrification process to remove the ammonia nitrogen, and output the domestic sewage after removing the ammonia nitrogen; the reuse device is used to perform solid-liquid separation treatment on the domestic sewage treated by the decomposition device to obtain detached biofilm and domestic sewage. sewage; inputting the shed biofilm into the decomposition device for sludge reuse, and sterilizing the domestic sewage obtained by separation treatment and outputting; the output device is used to process the domestic sewage output from the recycling device. The activated carbon is filtered and output to the external water use mechanism. In this embodiment, the buffer device can be connected with the domestic sewage collection structure to receive the domestic sewage input from the outside, and then use the decomposition device, the reuse device, etc. to process it to obtain relatively clean domestic water, and finally pass through the output device for further treatment. After filtering, it can be handed over to the external water use agency; during the period, automatic connection control is adopted between each device, for example, the DCS control system in the prior art is comprehensively regulated, and its control logic will be described in detail in the subsequent embodiments, here I won't go into details.

In the above embodiment, the buffer device may include a grid well and a regulating pool; the grid well is used to filter out the floating objects larger than a preset volume in the domestic sewage; the regulating pool is used to store the The grid well filters the domestic sewage after the floating matter is filtered, and provides stable water quality and quantity for the decomposition device. The decomposition device may include a primary sedimentation tank, an anaerobic hydrolysis tank, a primary contact oxidation tank, and a secondary contact oxidation tank; the primary sedimentation tank is connected to the buffer device, and is used for life after the buffer device is processed. The sewage is subjected to pre-aeration and preliminary precipitation treatment; the anaerobic hydrolysis tank is connected to the primary sedimentation tank, and is used for hydrolysis and acidification of the domestic sewage treated by the primary sedimentation tank, and the organic solids in the domestic sewage are removed. and predetermined categories of organic matter are decomposed into small molecule dissolved organic matter; the first-stage contact oxidation tank is connected with the anaerobic hydrolysis tank, the second-level contact oxidation tank is connected with the first-level contact oxidation tank, the first-level contact oxidation tank is connected with the first-level contact oxidation tank The contact oxidation tank and the secondary contact oxidation tank are used to convert the organic pollutants in the domestic sewage treated by the anaerobic hydrolysis tank into ammonia nitrogen through the metabolism of membrane organisms, and then through aerobic nitrification and anoxic denitrification The process removes the ammonia nitrogen. The recycling device includes a secondary sedimentation tank, a disinfection tank and a sludge tank; the secondary sedimentation tank is respectively connected with the secondary contact oxidation tank and the anaerobic hydrolysis tank, and is used for the secondary contact oxidation tank. The treated domestic sewage is subjected to solid-liquid separation treatment to obtain sludge, exfoliated biofilm and domestic sewage; the exfoliated biofilm is input into the anaerobic hydrolysis tank for sludge reuse; the disinfection tank and the two The sedimentation tank is connected to the secondary sedimentation tank for disinfection treatment; the sludge tank is connected to the secondary sedimentation tank and the primary sedimentation tank, respectively, and is used to store the secondary sedimentation tank for separation the sludge, and the domestic sewage overflowed by the sludge precipitation is input to the primary sedimentation tank.

To sum up, in practical work, the domestic sewage treatment system provided by the present invention can structurally include grid wells, sewage conditioning tanks, primary sedimentation tanks, anaerobic hydrolysis tanks, primary contact oxidation tanks, and secondary contact oxidation tanks , secondary sedimentation tank, disinfection tank, sludge tank, intermediate tank, activated carbon filter, reuse tank; domestic sewage from industrial production areas enters the grid well, and the large particles of debris in the water are intercepted and filtered, and the effluent enters the sewage conditioning tank . The sewage in the adjustment tank is pumped into the primary sedimentation tank by the sewage lift pump, and the primary sedimentation and pre-aeration are carried out. It is a small molecular substance, reducing the load of subsequent treatment, degrading part of the COD, and the effluent overflows to the first-level contact oxidation tank and the second-level contact oxidation tank. The contact oxidation tank adopts a technologically advanced membrane bioreactor, which uses the metabolism of the biofilm to convert organic pollutants into ammonia nitrogen first, and at the same time removes both organic matter and ammonia nitrogen through aerobic nitrification and anoxic denitrification. The contact oxidation tank has a built-in elastic three-dimensional filler, which has a large specific surface area, which can maintain a high biomass per unit volume, and has a high activity, which can remove organic pollutants at a high speed. The effluent of the secondary contact oxidation tank enters the secondary sedimentation tank for solid-liquid separation. The main function of the secondary sedimentation tank is to remove the shed biofilm brought out by the effluent of the contact oxidation tank. The sludge in the secondary sedimentation tank is transported to the anaerobic hydrolysis tank through the sludge return pump to complete the sludge return. Bottom sludge is regularly transported outwards. The effluent from the secondary sedimentation tank overflows to the disinfection tank for disinfection by chlorine tablets. The effluent from the disinfection tank overflows to the intermediate pool. The intermediate water tank is lifted into the activated carbon filter by the intermediate water pump for filtration, and the water produced by the filter enters the recycling water tank, and the final purified water is reused by the recycling water pump.

In an embodiment of the present invention, the system further includes a rotating mechanical group, and the rotating mechanical group includes a sewage lifting pump, a sludge return pump, an intermediate water pump and a recycling water pump; the sewage lifting pump is used for the buffering The domestic sewage stored in the device is pumped into the decomposition device; the sludge return pump is used for pumping the exfoliated biofilm into the decomposition device for sludge reuse; the intermediate water pump is used for the return of the sludge. The domestic sewage after the disinfection treatment in the device is pumped into the output device for activated carbon filtration; the reuse water pump is used to pump the domestic sewage filtered by the activated carbon in the output device into an external water use mechanism and/or pump The activated carbon filtering equipment fed into the output device provides backwash water. Referring to Figure 2 again, the above structure can be functionally divided into four parts, as follows:

1. Grill wells, regulating pools;

Since domestic sewage contains a certain amount of large floating objects (such as toilet paper, vegetable roots, plastic bags, etc.), it is intercepted by a grille to ensure the normal operation of the subsequent treatment equipment. The grille is designed at the entrance of the adjustment tank. The function of the regulating tank has the following two aspects: first, as a reservoir for sewage storage; second, water quality buffer, so that the water quality and water quantity of the anaerobic-contact oxidation treatment equipment are stable.

2. Primary sedimentation tank, anaerobic hydrolysis tank, primary and secondary contact oxidation tank;

Primary sedimentation tank: carry out pre-aeration and preliminary sedimentation of sewage, and recycle the overflow sewage of sludge tank at the same time.

Anaerobic hydrolysis tank: carry out hydrolysis and acidification reactions, decompose organic solids and non-biodegradable organic substances in sewage into small molecular dissolved organic substances, reduce the subsequent treatment load, and degrade part of COD.

Primary and secondary contact oxidation tanks: This unit adopts advanced membrane bioreactors, which utilize the metabolism of biofilms to first convert organic pollutants into ammonia nitrogen, and at the same time, through aerobic nitrification and anoxic denitrification processes, both organic matter and Ammonia nitrogen is removed. The biological contact oxidation tank has a built-in elastic three-dimensional filler, which has a large specific surface area, which can maintain a high biomass per unit volume, and has a high activity, which can remove organic pollutants at a high speed.

3. Secondary sedimentation tank, sludge return, disinfection tank, sludge tank;

Secondary sedimentation tank: For solid-liquid separation, the main function of the secondary sedimentation tank is to remove the exfoliated biofilm brought out from the effluent of the contact oxidation tank.

Sludge return: The sludge deposited at the bottom of the secondary sedimentation tank (falling off biofilm) is transported to the anaerobic hydrolysis tank through the sludge return pump for sludge reuse.

Disinfection pool: Manually add chlorine tablets on a regular basis for disinfection.

Sludge tank: Temporarily store the sludge, the bottom sludge is regularly shipped out, and the upper sewage overflows back to the primary sedimentation tank.

4. Intermediate pool, activated carbon filter, reuse pool;

Intermediate pool: The water from the disinfection pool enters the intermediate pool.

Activated carbon filter: The activated carbon filter can realize the functions of filtration and organic matter adsorption. The water in the intermediate pool is transported to the activated carbon filter through the intermediate water pump for filtration to reduce suspended solids and some organic matter in the water.

Reuse pool: The effluent from the filter enters the recycle pool, and the purified water is transported to the outside for reuse through the reuse pump, and backwash water is provided to the filter at the same time.

In an embodiment of the present invention, the system further includes an aeration fan, the aeration fan is connected to the primary sedimentation tank, the primary contact oxidation tank, the secondary contact oxidation tank, and the recycling device is connected to the precipitation treatment of the domestic sewage in the decomposition device, the conversion of the organic pollutants into ammonia nitrogen and the aeration treatment of the domestic sewage in the ammonia nitrogen stage; and the activated carbon in the output device. The filtered domestic sewage is subjected to aeration treatment. In another embodiment of the present invention, the system further includes a control device, the control device includes a sewage lift pump control module, an aeration fan control module, a sludge return pump control module and a recycling water pump control module; the sewage The lift pump control module is used to turn on the sewage lift pump to pump domestic sewage to the decomposition device when the domestic sewage stored in the buffer device is higher than a first predetermined amount of water; when the domestic sewage stored in the buffer device is When the water volume is lower than the second predetermined amount, the sewage lifting pump is turned off, and domestic sewage is stopped to be pumped into the decomposition device; the aeration fan control module is used to control the aeration fan to the Preliminary precipitation treatment of domestic sewage in the decomposition device, converting the organic pollutants into ammonia nitrogen and removing the domestic sewage in the ammonia nitrogen stage for aeration treatment; and/or, performing activated carbon filtration in the output device for domestic sewage. performing aeration treatment; the sludge return pump control module is configured to control the sludge return pump to start running for a second time period after the sewage lifting pump operates for a first certain period of time; and, when the sewage lifts After the pump stops running, the operation of the sludge return pump is stopped; the recycling water pump control module is used to control the recycling water pump to pump the domestic sewage filtered by the activated carbon in the output device according to the received control command. Backwash water is supplied to an external water use mechanism and/or to a device that is pumped into the output device for activated carbon filtration. Therefore, in the whole process of the above-mentioned embodiment, the aeration fan regularly aerates the primary sedimentation tank, the primary oxidation tank, and the secondary oxidation tank. To sum up, in actual work, the control device may include five control modules, each of which has a corresponding control logic, which will be described in detail in subsequent embodiments, and will not be described one by one here.

Please refer to FIG. 3 , the present invention also provides a control method of a domestic sewage treatment system, the method comprising:

S301 Receive domestic sewage and filter out floating objects larger than a preset volume in the domestic sewage;

S302 performs preliminary precipitation treatment on the domestic sewage, performs hydrolysis reaction and acidification reaction on the treated domestic sewage, and decomposes organic solids and predetermined types of organic matter in the domestic sewage into small-molecule-soluble organic pollutants;

S303 converts the organic pollutants into ammonia nitrogen through the metabolism of membrane organisms, and then removes the ammonia nitrogen through aerobic nitrification and anoxic denitrification;

S304 performs solid-liquid separation treatment on the domestic sewage after the ammonia nitrogen is removed to obtain detached biofilm and domestic sewage;

S305, the detached biofilm is recycled and reused, and the domestic sewage obtained by the separation treatment is disinfected and filtered with activated carbon to obtain output water;

S306 outputs the output water to an external water use mechanism.

In the above-mentioned embodiment, the method may further include: in the process of preliminary precipitation treatment of domestic sewage, during the process of converting the organic pollutants into ammonia nitrogen and removing the ammonia nitrogen, performing aeration treatment on the domestic sewage; and , the domestic sewage is subjected to aeration treatment during the activated carbon filtration process of the domestic sewage. For details, please refer to Figure 4. In the aeration treatment process, it can be divided into two modes, namely contact oxidation treatment gas supply and activated carbon filter scrubbing gas; among them, in the contact oxidation treatment gas supply mode, the domestic sewage is upgraded When the pump is running (when there are multiple domestic sewage lifting pumps, any domestic sewage lifting pump) starts the aeration fan in the interlocking state, and stops the interlocking when the domestic sewage lifting pumps (all domestic sewage lifting pumps) are stopped. The aeration fan in the input state.

In an embodiment of the present invention, the method further includes: when the domestic sewage stored in the buffer device is higher than a first predetermined amount of water, pumping domestic sewage into the decomposition device; when the domestic sewage stored in the buffer device is higher than a first predetermined amount of water; When the domestic sewage is lower than the second predetermined water volume, the pumping of the domestic sewage into the decomposition device is stopped. In actual work, this process is the operation control logic of the sewage lifting pump. Please refer to Figure 5. Take three pump equipment as an example. When the level is high (L≥3.0m), start the domestic sewage lifting pump in the state of interlocking input, and stop the domestic sewage lifting pump in the state of interlocking input when the liquid level in the regulating tank is low (L≤0.8m).

Referring to FIG. 6 , in an embodiment of the present invention, the control logic of the above step S305 in actual work is as follows: ), start timing, after 2400S (persons skilled in the art can choose and set according to the actual situation), the sludge recycling pump runs for 15min in the interlocking state, then stops running, resets the timing time, and circulates like this; When stopping (all domestic sewage lifting pumps), stop the sludge return pump in the state of interlocking.

In an embodiment of the present invention, outputting the output water to an external water use mechanism further includes: providing backwash water for the activated carbon filter device through the output water. In actual work, the control logic of the water pump here is divided into two modes, namely external water supply and activated carbon filter backwashing. For details, please refer to Figure 7:

1. External water supply mode:

When the liquid level is high (L≥3.5m), start the reuse water pump in the state of interlocking input, and stop the reuse water pump in the state of interlocking input when the liquid level is low (L≤1.5m).

2. Activated carbon filter backwash mode:

Start and stop according to the activated carbon filter backwash program control steps.

Please refer to FIG. 8 again, in an embodiment of the present invention, the control logic of the activated carbon filter is divided into operation program control and backwash program control;

Activated carbon filter operation program control:

1. Positive washing (open the discharge valve of the positive washing, open the water inlet valve after the positive washing discharge valve is in place, and start the intermediate water pump in the selected state after the water inlet valve is in place; after all the above are satisfied, the program starts timing, and the time reaches the set time automatically. to the next step);

2. Operation (open the water outlet valve, after the outlet valve is opened in place, close the front washing discharge valve, after the step water valve is open, the outlet valve is open, and the selected intermediate water pump is satisfied, the program starts timing, when the program is in this step, the middle The water pump automatically starts and stops according to the liquid level of the intermediate pool. When the intermediate water pump is out of operation, it will not count the time, and when it is running, it will count);

3. Standby (the accumulative running time reaches the set time, stop the selected intermediate water pump, close the water inlet valve and the water outlet valve, and the program ends when it is in place, and prompts the operator to perform backwashing)

Activated carbon filter backwash program control:

The program control panel adds the selection function of the reused water pump and aeration fan (the selected reused water pump and aeration fan are automatically started and stopped according to the program control steps). The steps of backwashing the activated carbon filter are as follows:

1. Drainage: Open the backwash discharge valve. After the backwash discharge valve is opened in place, open the positive wash discharge valve, start timing, and automatically enter the next step when the time is up;

2. Air wash: close the discharge valve of the front wash, start the selected Roots blower, open the intake valve, start timing, and go to the next step when the time is up;

3. Water washing: close the intake valve (execute at the same time when the fan is stopped), open the backwash inlet valve, after the backwash inlet valve is opened in place, start the selected reuse pump; the program starts timing; when the time is up, it will automatically enter the next step;

4. Front washing: stop the selected water pump for reuse. After the pump is stopped, the backwash inlet valve and the backwash drain valve are closed; To enter automatically enter the next step;

5. Standby: stop the intermediate water pump, close the discharge valve of the positive wash, close the water inlet valve, and the program resets the accumulated running time.

The beneficial technical effects of the present invention are as follows: the coordinated, continuous and automatic operation of functions such as sewage lifting, aeration, sludge return, filter operation backwashing, and purified water reuse in domestic sewage treatment is realized, the efficiency of domestic sewage treatment is improved, and the running costs.

The present invention also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and running on the processor, the processor implementing the above method when the computer program is executed.

The present invention also provides a computer-readable storage medium storing a computer program for executing the above method.

As shown in FIG. 9 , the electronic device 600 may further include: a communication module 110 , an input unit 120 , an audio processing unit 130 , a display 160 , and a power supply 170 . It is worth noting that the electronic device 600 does not necessarily include all the components shown in FIG. 9 ; in addition, the electronic device 600 may also include components not shown in FIG. 9 , and reference may be made to the prior art.

As shown in FIG. 9 , the central processing unit 100 , also sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, and the central processing unit 100 receives input and controls various aspects of the electronic device 600 component operation.

Wherein, the memory 140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure can be stored, and a program executing the related information can also be stored. And the central processing unit 100 can execute the program stored in the memory 140 to realize information storage or processing.

The input unit 120 provides input to the central processing unit 100 . The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600 . The display 160 is used for displaying display objects such as images and characters. The display can be, for example, but not limited to, an LCD display.

The memory 140 may be solid state memory, eg, read only memory (ROM), random access memory (RAM), SIM card, and the like. There may also be memories that retain information even when powered off, selectively erased and provided with more data, examples of which are sometimes referred to as EPROMs or the like. Memory 140 may also be some other type of device. Memory 140 includes buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application/function storage part 142 for storing application programs and function programs or for performing operations of the electronic device 600 through the central processing unit 100 .

The memory 140 may also include a data store 143 for storing data such as contacts, digital data, pictures, sounds and/or any other data used by the electronic device. The driver storage section 144 of the memory 140 may include various drivers of the electronic device for communication functions and/or for executing other functions of the electronic device (eg, a messaging application, a contact book application, etc.).

The communication module 110 is the transmitter/receiver 110 that transmits and receives signals via the antenna 111 . A communication module (transmitter/receiver) 110 is coupled to the central processing unit 100 to provide input signals and receive output signals, as may be the case with conventional mobile communication terminals.

Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module, and/or a wireless local area network module. Communication module (transmitter/receiver) 110 is also coupled to speaker 131 and microphone 132 via audio processor 130 to provide audio output via speaker 131 and to receive audio input from microphone 132 for general telecommunication functions. Audio processor 130 may include any suitable buffers, decoders, amplifiers, and the like. In addition, the audio processor 130 is also coupled to the central processing unit 100 so as to enable recording on the local unit through the microphone 132 and to play back the sound stored on the local unit through the speaker 131 .

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flows of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. A domestic sewage treatment system is characterized by comprising a buffering device, a decomposition device, a recycling device and an output device;

the buffer device is used for storing the received domestic sewage and filtering floating objects larger than a preset volume in the domestic sewage;

the decomposition device is used for carrying out primary precipitation treatment on the domestic sewage filtered and treated by the cache device, carrying out hydrolysis reaction and acidification reaction on the treated domestic sewage, and decomposing organic solids and organic matters of a preset category in the domestic sewage into small-molecule soluble organic pollutant; converting the organic pollutants into ammonia nitrogen through the metabolism of membrane organisms, removing the ammonia nitrogen through aerobic nitrification and anoxic denitrification processes, and outputting the domestic sewage after the ammonia nitrogen is removed;

the recycling device is used for carrying out solid-liquid separation treatment on the domestic sewage treated by the decomposition device to obtain a falling biological film and domestic sewage; inputting the falling biological membrane into the decomposition device for sludge recycling, and outputting the domestic sewage obtained by separation treatment after disinfection treatment;

the output device is used for outputting the domestic sewage output by the recycling device to an external water mechanism after being filtered by active carbon.

2. The domestic sewage treatment system of claim 1 wherein said buffering means comprises a grid well and a conditioning tank;

the grating well is used for filtering floating objects larger than a preset volume in the domestic sewage;

the adjusting tank is used for storing the domestic sewage after the floating objects are filtered by the grille well, and the decomposing device is used for providing stable water quality and water quantity.

3. The domestic sewage treatment system of claim 1 wherein said decomposition means comprises a primary settling tank, an anaerobic hydrolysis tank, a primary contact oxidation tank and a secondary contact oxidation tank;

the primary sedimentation tank is connected with the buffer device and is used for carrying out pre-aeration and primary sedimentation treatment on the domestic sewage treated by the buffer device;

the anaerobic hydrolysis tank is connected with the primary sedimentation tank and is used for carrying out hydrolysis and acidification reactions on the domestic sewage treated by the primary sedimentation tank and decomposing organic solids and organic matters of a preset category in the domestic sewage into micromolecular soluble organic matters;

the first-stage contact oxidation pond with the anaerobic hydrolysis pond links to each other, the second grade contact oxidation pond with the first-stage contact oxidation pond links to each other, the first-stage contact oxidation pond with the second grade contact oxidation pond is used for through the biological metabolism of membrane will organic pollutant in the domestic sewage after the anaerobic hydrolysis pond is handled turns into the ammonia nitrogen, and the rethread aerobic nitrification and oxygen deficiency denitrification process get rid of the ammonia nitrogen.

4. The domestic sewage treatment system of claim 3 wherein said recycling means comprises a secondary sedimentation tank, a disinfection tank and a sludge tank;

the secondary sedimentation tank is respectively connected with the secondary contact oxidation tank and the anaerobic hydrolysis tank and is used for carrying out solid-liquid separation treatment on the domestic sewage treated by the secondary contact oxidation tank to obtain sludge, a falling biological membrane and domestic sewage; inputting the falling biological membrane into the anaerobic hydrolysis tank for sludge recycling;

the disinfection tank is connected with the secondary sedimentation tank and is used for disinfecting the domestic sewage treated by the secondary sedimentation tank;

the sludge tank is respectively connected with the secondary sedimentation tank and the primary sedimentation tank and is used for storing the sludge separated by the secondary sedimentation tank and inputting the domestic sewage overflowed by the sludge sedimentation into the primary sedimentation tank.

5. The domestic sewage treatment system of claim 4, further comprising an aeration fan, wherein said aeration fan is connected to said primary sedimentation tank, said primary contact oxidation tank, said secondary contact oxidation tank and said recycling device, and is used for performing aeration treatment on the domestic sewage in said decomposition device for preliminary sedimentation treatment, converting said organic pollutants into ammonia nitrogen and removing said ammonia nitrogen; and carrying out aeration treatment on the domestic sewage subjected to active carbon filtration in the output device.

6. The domestic sewage treatment system of claim 5, wherein said system further comprises a rotating machinery group, said rotating machinery group comprising a sewage lift pump, a sludge recirculation pump, an intermediate water pump, and a reuse water pump;

the sewage lifting pump is used for pumping the domestic sewage stored in the buffer device into the decomposition device;

the sludge reflux pump is used for pumping the falling biological membrane into the decomposition device for sludge recycling;

the intermediate water pump is used for pumping the domestic sewage after the disinfection treatment in the recycling device to the output device for active carbon filtration;

the recycling water pump is used for pumping the domestic sewage filtered by the activated carbon in the output device to an external water using mechanism and/or pumping the domestic sewage to an activated carbon filtering device in the output device to provide backwashing water.

7. The domestic sewage treatment system of claim 6, wherein said system further comprises a control device comprising a sewage lift pump control module, an aeration blower control module, a sludge return pump control module, and a reuse pump control module;

the sewage lifting pump control module is used for starting the sewage lifting pump to pump domestic sewage into the decomposition device when the domestic sewage stored in the buffer device is higher than a first preset water amount; when the domestic sewage stored in the buffer device is lower than a second preset water amount, the sewage lifting pump is closed, and the domestic sewage is stopped from being pumped into the decomposition device;

the aeration fan control module is used for controlling the aeration fan to carry out preliminary sedimentation treatment on the domestic sewage in the decomposition device and convert the organic pollutants into ammonia nitrogen and carry out aeration treatment on the domestic sewage in the ammonia nitrogen removal stage according to the received control instruction; and/or, the domestic sewage filtered by the active carbon in the output device is subjected to aeration treatment;

the sludge reflux pump control module is used for controlling the sludge reflux pump to start to operate for a second time period after the sewage lifting pump operates for a first certain time period; and stopping the operation of the sludge reflux pump after the operation of the sewage lifting pump is stopped;

the reuse water pump control module is used for controlling the reuse water pump to pump the domestic sewage filtered by the activated carbon in the output device into an external water using mechanism and/or pump the domestic sewage into the output device for providing backwashing water by the activated carbon filtering equipment according to the received control instruction.

8. A control method for a domestic sewage treatment system according to claim 1, wherein said method comprises:

receiving domestic sewage and filtering floating objects larger than a preset volume in the domestic sewage;

carrying out primary precipitation treatment on the domestic sewage, carrying out hydrolysis reaction and acidification reaction on the treated domestic sewage, and decomposing organic solids and organic matters of a predetermined category in the domestic sewage into small-molecule soluble organic pollutant;

converting the organic pollutants into ammonia nitrogen through the metabolism of membrane organisms, and removing the ammonia nitrogen through aerobic nitrification and anoxic denitrification processes;

carrying out solid-liquid separation treatment on the domestic sewage from which the ammonia nitrogen is removed to obtain a falling biological film and domestic sewage;

the falling biological membrane is recycled by refluxing, and the domestic sewage obtained by separation treatment is disinfected and then filtered by activated carbon to obtain output water;

and outputting the output water to an external water mechanism.

9. The control method according to claim 8, characterized in that the method further comprises:

in the primary precipitation treatment process of the domestic sewage, converting the organic pollutants into ammonia nitrogen and carrying out aeration treatment on the domestic sewage in the process of removing the ammonia nitrogen; and carrying out aeration treatment on the domestic sewage in the process of filtering the domestic sewage by using the activated carbon.

10. The control method according to claim 8, characterized in that the method further comprises:

when the domestic sewage stored in the buffer device is higher than a first preset water amount, pumping the domestic sewage into the decomposition device;

and when the domestic sewage stored in the buffer device is lower than a second preset water amount, stopping pumping the domestic sewage into the decomposition device.

11. The control method according to claim 8, wherein the means for outputting the output water to the external water further comprises: and supplying backwashing water for the activated carbon filtering equipment through the output water.

12. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 8 to 11 when executing the computer program.

13. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 8 to 11.

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