CN114873853A - Sewage treatment system of garbage compression transfer station - Google Patents

Abstract

The invention discloses a sewage treatment system of a garbage compression transfer station, comprising a first sedimentation tank, a buffer tank, a coarse filter tank, a sewage reactor, a second sedimentation tank and a reuse tank; the sewage generated by the garbage compression transfer station passes through the first sedimentation tank. The sedimentation tank removes impurities and precipitable impurities and enters the buffer tank for temporary storage; the sewage treatment system is provided with a high-load operation mode and a low-load operation mode; compared with the prior art, the present invention is suitable for higher water content. Co-gasification of sludge and coal from municipal sewage treatment for resource/energy utilization. Compared with the existing technology of using the existing facilities of the waste compression transfer station, fully considering the operation of the waste compression station, the characteristics of sewage production and water use, it is helpful for the standard discharge of sewage and the recycling of reclaimed water in the waste compression transfer station.

Description

Wastewater Compression Transfer Station Sewage Treatment System

technical field

The invention relates to the technical field of environmental engineering, in particular to a sewage treatment and reuse system of a waste compression transfer station.

Background technique

As of 2020, the annual removal and transportation of urban domestic waste in my country is 235 million tons, and the per capita waste generation is about 0.8 kg/(person·day). Domestic waste usually undergoes a compression transfer process from the production end to the final treatment (incineration, landfill, etc.) to reduce waste transfer costs. About 3% to 5% of the garbage weight will be produced during the transfer compression process of domestic garbage, which is sometimes called landfill leachate in different scenarios. At the same time, certain sewage will also be generated during the process of garbage truck cleaning, ground flushing, and equipment flushing in the compression transfer station. The above-mentioned parts constitute the main part of the sewage in the domestic waste compression transfer station. The life compression transfer station usually only operates continuously during the day, and the operation time does not exceed 8 hours. Due to the source of sewage in the domestic compression transfer station and the characteristics of the operation of the domestic compression transfer station, the sewage of the domestic compression transfer station has the characteristics of high pollutant concentration, drastic changes in water quality, concentrated discharge, and high content of insoluble impurities. However, at present, most domestic compression transfer stations only set sedimentation tanks for sewage, and a large amount of sewage from compression stations has not been properly treated and reused.

Patent document CN112939339A provides a landfill leachate treatment system and an application method thereof, wherein the landfill leachate treatment system includes an upper layer area and a lower layer area, and the upper layer area is provided with a dosing device, a coagulation reaction tank, a clean water tank, a gas Floating device and activated carbon filter, and a biochemical tank is arranged in the lower area; the coagulation reaction tank extracts the landfill leachate through the liquid inlet pipe, and the liquid inlet pipe is provided with a landfill leachate extraction pump, and the dosing device is connected to the coagulation reaction tank. The coagulation reaction tank is equipped with a paddle mixer; the air flotation device is connected to the coagulation reaction tank; the biochemical tank is connected to the air flotation device; It is suitable for the standard sewage treatment and reuse system of the compression transfer station.

SUMMARY OF THE INVENTION

In order to solve at least one technical problem existing in the above-mentioned background art, the present invention provides a sewage treatment system for a waste compression transfer station.

For achieving the above object, the technical scheme of the present invention is:

The sewage treatment system of the garbage compression transfer station includes a first sedimentation tank, a buffer tank, a coarse filter, a sewage reactor, a second sedimentation tank and a reuse tank;

The sewage generated by the garbage compression transfer station is removed by the first sedimentation tank to remove impurities and precipitated impurities, and then enters the buffer tank for temporary storage;

The sewage treatment system is provided with a high-load operation mode and a low-load operation mode;

The high-load operation mode is as follows: the sewage in the buffer tank enters the coarse filter at 70% to 130% of the normal flow of the system design to remove insoluble impurities in the sewage, and then enters the sewage reactor for biochemical treatment, and the treated sewage enters the first stage. The second sedimentation tank removes the sludge in the sewage, and then discharges up to the standard;

The low-load operation mode is as follows: the sewage in the buffer tank enters the coarse filter at 20% to 70% of the normal flow of the system design to remove insoluble impurities in the sewage, and then enters the sewage reactor for biochemical treatment, and the treated sewage enters the first stage. The second sedimentation tank removes the sludge in the sewage, and the obtained clear liquid enters the reuse tank for use as reclaimed water.

Further, during the normal operation period of the garbage compression transfer station, and the remaining untreated amount of the sewage treatment system is greater than 150% to 200% of the demand for reuse water, the sewage treatment system operates in a high-load mode; the garbage compression transfer station operates at a low load or stops operation. During the period, and the remaining untreated amount of the sewage treatment system is less than 150% to 200% of the demand for reuse water, the sewage treatment system operates in a low-load mode.

Further, the sewage reactor is an MBBR reactor.

Further, the MBBR reactor is a fluidized bed reactor or a fixed bed reactor.

Further, the sludge generated in the buffer tank, the coarse filter tank, the sewage reactor, the second sedimentation tank and the reuse tank is regularly discharged into the first sedimentation tank, and the accumulated insoluble impurities in the first sedimentation are regularly cleaned and removed. Send to the garbage compression device for compression and dehydration.

Further, the insoluble impurities are compressed and dehydrated together after being mixed with the household garbage.

Further, a sterilization device is arranged in the recycle pool.

Further, when the concentration of sewage pollutants produced by the waste compression transfer station is greater than 150% of the design value, the sewage treatment system operates in a high-load mode throughout the day.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention utilizes the existing facilities of the garbage compression transfer station, fully considers the operation of the garbage compression station, the characteristics of sewage production and water use, and is helpful for the standard discharge of sewage in the garbage compression transfer station and the recycling of reclaimed water.

Description of drawings

1 is a flowchart of a high-load operation mode of a sewage treatment system provided by an embodiment of the present invention;

2 is a flowchart of a low-load operation mode of a sewage treatment system provided by an embodiment of the present invention;

In the figure: 1. The first sedimentation tank; 2. The buffer tank; 3. The coarse filter tank; 4. The sewage reactor; 5. The second sedimentation tank; 6. The reuse tank.

Detailed ways

The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

Example 1:

This embodiment provides a sewage treatment system for a waste compression transfer station. The system includes the following devices: a first sedimentation tank 1, a buffer tank 2, a coarse filter tank 3, a sewage reactor 4, a second sedimentation tank 5 and a reuse tank 6.

The sewage generated by the domestic waste compression station passes through the first sedimentation tank 1 to remove large debris and precipitable impurities, and then enters the buffer tank for temporary storage. The sewage treatment system has a high-load operation mode and a low-load operation mode. The existing sedimentation tank (ie the first sedimentation tank 1) of the garbage compression station is used to settle the sedimentable and floating impurities in the sewage, and a special person is arranged to clean the impurities in the sedimentation tank regularly. The garbage compression station usually operates from 6:00 to 14:00. It will complete a whole day of compression in 8 hours, and will generate a large amount of compressed sewage in a short period of time, and basically no sewage is generated during other periods. The buffer pool 2 can store the sewage generated by the garbage compression transfer station for 3 days, which is used to buffer a large amount of garbage press filtrate produced in a short time and balance the pollutant concentration (COD) of sewage from different sources (different types of garbage press filtrate and vehicle/road washing sewage). , NH3-N, etc.), so as to achieve a relatively stable water intake and pollutant load, and avoid excessive impact on the sewage system. The sewage reactor preferably adopts the MBBR reactor 4. This type of reactor adopts immobilized biofilm, and the sludge circulation and water circulation separation can better adapt to the treatment scenarios where the sewage pollutant load and the water volume change frequently.

1) High-load mode: In the high-load mode, the sewage treatment of the domestic waste compression transfer station aims to meet the management standard of sewage. The sewage in the buffer tank enters the coarse filter 3 to remove the insoluble impurities in the sewage at 70% to 130% of the normal flow of the system design, and then enters the MBBR reactor 4 for biochemical treatment, and the treated sewage enters the second sedimentation tank 5 to remove the sewage Sludge in the final discharge, such as the municipal sewage system.

2) Low-load mode: In low-load mode, the sewage treatment of the domestic waste compression transfer station aims to reuse sewage. The sewage in buffer, 2 enters the coarse filter 3 at 20% to 70% of the normal flow of the system design to remove insoluble impurities in the sewage, and then enters the MBBR reactor for biochemical treatment, and the treated sewage enters the second sedimentation tank 5 to remove sewage Sludge in the sludge, the obtained clear liquid enters the reuse pool 6 and is used as reclaimed water. Preferably, a sterilization device is also provided in the recycling pool 6 .

During the normal operation period of the domestic waste compression station, and the remaining untreated amount of the sewage treatment system is greater than 150% to 200% of the demand for reused water, the sewage treatment system operates in a high-load mode. During the period of low-load operation or stop operation of the domestic waste compression station, and the remaining untreated amount of the sewage treatment system is less than 150% to 200% of the demand for reuse water, the sewage treatment system will operate at a low load.

In a specific embodiment, the MBBR reactor 4 is a fluidized bed reactor. It can better adapt to the characteristics of high COD concentration in the sewage of the compression station, quickly realize the dynamic balance of the biofilm, realize automatic stripping, and effectively reduce the amount of sludge produced.

In a specific embodiment, the sludge and impurities generated in the buffer tank 2, the coarse filter tank 3, the sewage reactor 4, the second sedimentation tank 5 and the reuse tank 6 are regularly discharged into the first sedimentation tank 1 . The accumulated insoluble impurities in the first sedimentation tank 1 are cleaned regularly and sent to the garbage compression device for compression and dehydration. Preferably, the insoluble impurities can be compressed and dehydrated together after being mixed with household waste. Due to the high COD of the sewage in the compression station, the sludge output rate is much higher than that of the domestic sewage, which is about 100t DS/10,000 m3. However, because the total amount of sewage is small, the output of sludge is not much. Taking the most common 100t/d compression transfer station in Guangzhou as an example, the total amount of sewage produced is about 5 tons per day, and the sludge produced by sewage treatment is about 250kg (calculated at 80% moisture content), and a separate sludge dewatering station is constructed. , storage, and transportation equipment will result in more waste of resources and investment. It is the most economical and reasonable treatment method to use the existing garbage compression equipment in the garbage compression transfer station to dewater the sludge and transport it to the domestic garbage terminal treatment facility together with the garbage.

When the concentration of sewage pollutants produced by the domestic waste compression station is greater than 150% of the design value, the waste water treatment system of the domestic waste compression transfer station can operate in a high-load mode throughout the day. Due to changes in the weather and the type of garbage to be compressed in the domestic garbage compression transfer station, the COD concentration of sewage generated by garbage compression may change significantly, and the daily average concentration may sometimes change by 2 to 3 times. When the sewage treatment is implemented, the high-load mode operation is prioritized to ensure the discharge of sewage up to the standard.

The above table shows the water quality of a waste compression transfer station treated by this system. The TCOD of pollutants in the sewage of the waste compression transfer station is 6640-8100 mg/L, and the NH3-N is between 78-97 mg/L. After the system treatment of the present invention, the quality of the sewage effluent in the high-load mode can stably reach GB T 31962. - The relevant requirements for the water quality of sewage discharged into urban sewers stipulated in 2015; the water quality of the effluent can stably meet the water quality requirements for road and vehicle washing stipulated in GBT18920-2020 urban sewage recycling and utilization in the low-load treatment mode.

Example 2:

Referring to Example 1, the difference is that the MBBR reactor 4 is a fixed bed reactor. It can better adapt to the large concentration of COD in the sewage of the compression station, and can effectively reduce the amount of sludge produced. When the resistance in the reactor increases, the immobilized membrane module of the reactor needs to be removed periodically.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those of ordinary skill in the art to understand the content of the present invention and implement them accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. The sewage treatment system of the garbage compression transfer station is characterized by comprising a first sedimentation tank, a buffer tank, a rough filtration tank, a sewage reactor, a second sedimentation tank and a reuse water tank;

the sewage generated by the garbage compression transfer station enters a buffer tank for temporary storage after impurities and precipitable impurities are removed by a first sedimentation tank;

the sewage treatment system is provided with a high-load operation mode and a low-load operation mode;

the high-load operation mode is as follows: sewage in the buffer tank enters a coarse filtration tank to remove insoluble impurities in the sewage at 70-130% of the normal flow of the system design, then enters a sewage reactor to carry out biochemical treatment, and the treated sewage enters a second sedimentation tank to remove sludge in the sewage and then reaches the standard to be discharged;

the low-load operation mode is as follows: sewage in the buffer tank enters a coarse filtration tank to remove insoluble impurities in the sewage by 20-70% of the normal flow of the system design, then enters a sewage reactor to carry out biochemical treatment, the treated sewage enters a second sedimentation tank to remove sludge in the sewage, and the obtained clear liquid enters a reuse water tank to be used as reclaimed water.

2. The waste compression transfer station sewage treatment system of claim 1, wherein when the waste compression transfer station is in a normal operation period and the remaining untreated amount of the sewage treatment system is 150% to 200% greater than the demand of the reuse water, the sewage treatment system operates in a high-load mode; and when the garbage compression transfer station runs in a low-load mode or stops working, and the residual untreated capacity of the sewage treatment system is 150-200% smaller than the demand of the reuse water, the sewage treatment system runs in a low-load mode.

3. The waste compression transfer station sewage treatment system of claim 1, wherein the sewage reactor is an MBBR reactor.

4. The waste compression transfer station sewage treatment system of claim 3, wherein the MBBR reactor is a fluidized bed reactor or a fixed bed reactor.

5. The waste water treatment system of the waste compression transfer station as claimed in claim 1, wherein the sludge generated in the buffer tank, the coarse filtration tank, the waste water reactor, the second sedimentation tank and the reuse water tank is discharged into the first sedimentation tank at regular time, and the insoluble impurities accumulated in the first sedimentation tank are cleaned at regular time and sent to the waste compression device for compression and dehydration.

6. The sewage treatment system of the garbage compression transfer station as claimed in claim 5, wherein the insoluble impurities are compressed and dehydrated together with the domestic garbage after being mixed.

7. The sewage treatment system of the garbage compression transfer station as claimed in claim 1, wherein a sterilization device is provided in the reuse water tank.

8. The waste water treatment system of the waste compression transfer station of claim 1, wherein when the concentration of the waste water pollutants generated by the waste compression transfer station is greater than 150% of a designed value, the waste water treatment system is operated in a high-load mode all day.

Images