CN205773895U - A kind of municipal sewage denitrification and dephosphorization equipment - Google Patents

Abstract

The utility model discloses an urban sewage denitrification and dephosphorization equipment, which comprises a denitrification dephosphorization reactor, a middle settling tank, a diverter, a short-range nitrification reactor and an anammox reactor which are sequentially connected through a main pipeline; The anaerobic ammonium oxidation reactor is equipped with an online water quality measuring instrument and a flow controller, and the flow controller is connected with a flow divider; the online water quality measuring instrument can monitor the nitrogen composition in the effluent of the anammox reactor in real time and content, through the flow controller and flow divider to control the distribution ratio of the medium sedimentation tank supernatant into the short-path nitrification reactor and the anaerobic ammonium oxidation reactor; And denitrification phosphorus removal reactor to achieve further removal of nitrogen. The utility model provides a set of high-efficiency, low-consumption and low-cost urban sewage nitrogen and phosphorus removal equipment.

Description

A device for denitrification and dephosphorization of urban sewage

technical field

The utility model relates to a device for denitrifying and dephosphorizing urban sewage, which belongs to the technical field of urban sewage treatment.

Background technique

The shortage of water resources and energy and the deteriorating quality of water environment have become the bottleneck of social and economic development. It is imperative to increase the rate and degree of sewage treatment, improve the efficiency of nitrogen and phosphorus removal in sewage treatment plants, and reduce the energy consumption of sewage treatment. In recent years, sewage treatment discharge standards have become increasingly stringent, and with the improvement of treatment requirements, the energy consumption of sewage treatment process has also increased. In the traditional sewage treatment technology, due to the competition and contradiction between denitrification and phosphorus removal in the reaction substrate (carbon source) and reaction space in the denitrification and phosphorus removal process, it is difficult to obtain a good effect of simultaneous removal of N and P. A large amount of additional energy is required to obtain satisfactory results.

The utility model has developed a kind of denitrification and dephosphorization equipment for urban sewage. It adopts a short-range nitrification reactor that efficiently accumulates NO ₂ ^ˉ -N, and introduces a multi-point water inlet mechanism for the short-range nitrification section and the anaerobic ammonium oxidation section, and reasonably distributes it into the short-range nitrification. Reactor and anammox reactor influent ratio, to achieve efficient and stable autotrophic denitrification efficiency, and return the effluent of anaerobic ammonium oxidation reactor to the denitrification phosphorus removal reactor in the previous stage, in the anaerobic/ Under the condition of anoxic alternating operation, the refluxing NO ₃ ^ˉ and NO ₂ ^ˉ are used as electron acceptors to integrate the denitrification process and the phosphorus removal process into one, so as to achieve the purpose of simultaneous phosphorus and nitrogen removal.

Utility model content

The purpose of the utility model is to provide a device for denitrification and dephosphorization of urban sewage.

The technical scheme that the utility model takes is:

A kind of denitrification and dephosphorization equipment for urban sewage, comprising a denitrification dephosphorization reactor, a middle sedimentation tank, a splitter, a short-range nitrification reactor and anaerobic ammonium oxidation reactor connected in sequence through a main pipeline; the denitrification dephosphorization reaction A sludge return pipe is provided between the intermediate sedimentation tank and the intermediate sedimentation tank to introduce the sludge in the intermediate sedimentation tank into the denitrification phosphorus removal reactor; between the denitrification phosphorus removal reactor and the anaerobic ammonia oxidation reactor The effluent from the oxyammox reactor is introduced into the sewage return pipe of the denitrification dephosphorization reactor; there is a pipeline between the diverter and the anammox reactor, which can lead the effluent from the diverter into the anammox reactor ; Between the short-path nitrification reactor and the anammox reactor, there is a sewage return pipe that can lead the effluent of the anammox reactor into the short-path nitrification reactor; An on-line measuring instrument and a flow controller, and the flow controller is connected with a shunt.

Further, the denitrification phosphorus removal reactor is provided with a water inlet pipe, a sludge return pipe, a sewage return pipe, a water outlet pipe, a vent pipe, an aeration facility and a stirring facility.

Further, the denitrification dephosphorization reactor is composed of anaerobic zone and facultative zone, water inlet pipe and sludge return pipe are set in anaerobic zone, sewage return pipe, water outlet pipe, vent pipe, aeration facility and stirring The facility is set in the aerobic area.

Further, the intermediate sedimentation tank is provided with a water inlet pipe, a water outlet pipe and a sludge return pipe.

Further, the short-path nitrification reactor is provided with a water inlet pipe, a water outlet pipe, a sludge return pipe, a sewage return pipe, a vent pipe, a temperature controller, a DO measuring instrument and an aeration facility.

Further, the anaerobic ammonium oxidation reactor is provided with a water inlet pipe, a water outlet pipe, a vent pipe, a backwash pipe, and a temperature controller.

The beneficial effects of the utility model are:

1) The denitrification and phosphorus removal reactor in the urban sewage denitrification and phosphorus removal equipment of the utility model is divided into anaerobic zone and facultative oxygen zone. Anoxic or aerobic conditions can be used to judge the needs of electron acceptors, which can not only realize the efficient utilization of organic matter and ensure the effect of phosphorus removal, but also carry out advanced treatment of nitrogen oxides in the effluent of the anammox reactor;

2) The short-range nitrification reactor of the urban sewage denitrification and phosphorus removal equipment of the utility model only needs to control the reaction temperature and aeration rate to achieve the maximum nitrous accumulation, and control the short-range nitrification reaction through the diversion of the supernatant in the middle sedimentation tank The proportion of sewage in the reactor and the anammox reactor, so as to realize the efficient autotrophic denitrification process. Compared with the existing semi-short-range nitrification reactor, the short-range nitrification reactor and the anammox reaction The control conditions of the device are more convenient and stable;

3) The urban sewage denitrification and phosphorus removal equipment of the utility model can monitor the nitrogen composition and content in the effluent of the anammox reactor in real time, and control the supernatant of the sedimentation tank to enter the short-range nitrification reaction according to the nitrogen content in the effluent The ratio of the reactor to the anammox reactor, and the flexible control of the return flow of the anammox reactor, so as to obtain efficient pollutant removal effect.

Description of drawings

Fig. 1 is a structural schematic diagram of the urban sewage denitrification and dephosphorization equipment of the present utility model.

Description of drawings: 1. Denitrification phosphorus removal reactor; 11. Water inlet pipe; 12. Aeration facility; 13. Stirring facility; 14. Gas flow meter; 15. Fan; 16. Vent pipe; 2. Sink Pool; 21. Pipeline; 22. Sludge return pipe; 23. Vent pipe; 3. Splitter; 31. Pipeline; 32. Pipeline; 33. Pipeline; 34. Flow controller; 35. Water quality online Measuring instrument; 4. Short-range nitrification reactor; 41. Temperature controller; 42. DO measuring instrument; 43. Gas flow meter; 44. Fan; 45. Aeration facility; 46. Sludge return pipe; 47. Vent pipe ;5, anammox reactor; 51, pipeline; 52, backwash pipe; 53, temperature controller; 54, vent pipe; 55, outlet pipe;

detailed description

Below in conjunction with specific embodiment and accompanying drawing, the utility model is further explained and illustrated.

Example:

As shown in Figure 1, the urban sewage denitrification and phosphorus removal equipment of the present utility model includes a denitrification and phosphorus removal reactor 1, a middle sedimentation tank 2, a splitter 3, a short-range nitrification reactor 4 and anaerobic reactors connected in sequence through the main pipeline. Ammoxidation reactor 5; the denitrification dephosphorization reactor 1 is connected with the middle sedimentation tank 2 through a pipeline 21; the middle sedimentation tank 2 is connected with the diverter 3 through a pipeline 31; the diverter 3 is connected with the short-range nitrification The reactor 4 is connected by a pipeline 32; the short-path nitrification reactor 4 is connected with the anammox reactor 5 by a pipeline 51; The sludge in the middle settling tank 2 is introduced into the sludge return pipe 22 of the denitrification dephosphorization reactor 1; between the denitrification dephosphorization reactor 1 and the anammox reactor 5, an anammox reaction The effluent of the device 5 is introduced into the sewage return pipe 57 of the denitrification dephosphorization reactor 1; the effluent of the diverter 3 can be introduced into the anammox reactor 5 between the splitter 3 and the anammox reactor 5 The pipeline 33; between the short-path nitrification reactor 4 and the anammox reactor 5, there is a sewage return pipe 56 that can lead the effluent of the anammox reactor 5 into the short-path nitrification reactor 4; The oxygen ammoxidation reactor 5 is provided with an online water quality measuring instrument 35 and a flow controller 34 , and the flow controller 34 is connected with the flow divider 3 .

Preferably, the denitrification dephosphorization reactor 1 adopts the suspended growth activated sludge tank type, and the tank is divided into anaerobic zone and facultative zone, the water inlet pipe 11 and the sludge return pipe 22 are arranged in the anaerobic zone, and the sewage return pipe 57. The aeration facility 12, the stirring facility 13 and the vent pipe 16 are set in the aerobic area, and the aeration facility 12 is also connected with a gas flow meter 14 and a fan 15.

Preferably, the intermediate sedimentation tank 2 is provided with a sludge return pipe 22 , and a vent pipe 23 is provided on the sludge return pipe 22 .

Preferably, the short-path nitrification reactor 4 adopts the suspended growth activated sludge tank type, and the mud-water separation area is embedded in the tank, and the reactor is equipped with a temperature controller 41, a DO measuring instrument 42, an aeration device 45, and a sludge reflux Pipe 46 and vent pipe 47, the aeration facility 45 is also connected with a gas flow meter 43 and a fan 44.

Preferably, the anammox reactor 5 adopts a biofilm reactor, and is provided with a backwash pipe 52 , a temperature controller 53 , a vent pipe 54 and a water outlet pipe 55 .

The urban sewage nitrogen and phosphorus removal equipment of the utility model operates in the following manner: the pretreated urban sewage is introduced into the denitrification and phosphorus removal reactor 1 through the water inlet pipe 11, and the denitrification and phosphorus removal reactor 1 is composed of anaerobic zone and facultative oxygen The anaerobic zone receives the return sludge in the middle settling tank 2 through the sludge return pipe 22, and the anaerobic zone receives the reflux liquid of the anammox reactor 5 through the sewage return pipe 57. When there are more nitrogen oxides in the reflux liquid of the anammox reactor 5, which can satisfy the required electron acceptors for denitrification and dephosphorization, stop the aeration facility 12 in the facultative zone of the denitrification dephosphorization reactor 1, Turn on the stirring facility 13. At this time, the denitrification and phosphorus removal bacteria enriched in the denitrification and phosphorus removal reactor 1 use the nitrogen oxides in the reflux liquid as electron acceptors. At this time, the anaerobic/anoxic working conditions are adopted to operate, and nitrogen , phosphorus removal; when nitrogen oxides are less in the reflux liquid of the anammox reactor 5, when not enough to satisfy the required electron acceptor of phosphorus removal, close the stirring facility 13, open the aeration facility 12, at this moment Anaerobic/aerobic working conditions are adopted to realize the removal of phosphorus; the mixed liquid in the denitrification phosphorus removal reactor 1 enters the intermediate sedimentation tank 2 through the pipeline 21, and the sludge and water are separated in the intermediate sedimentation tank 2, and the sludge is passed through the sewage Part of the mud return pipe 22 returns to the anaerobic zone of the denitrification phosphorus removal reactor 1, and the supernatant enters the flow divider 3 through the pipeline 31, and is divided by the flow divider 3, and part of the sewage enters the short-path nitrification reactor 4 through the pipeline 32, and a part Sewage enters the anammox reactor 5 through the pipeline 33; the flow distribution ratio of the pipeline 32 and the pipeline 33 is determined by the flow controller 34 according to the NH ₄ ⁺ - of the anammox reactor 5 detected by the water quality online measuring instrument 35 N content is determined; the sewage entering the short-range nitrification reactor 4 through the pipeline 32 undergoes a short-range nitrification reaction here, so that the NH ₄ ⁺ -N in the sewage is converted into NO ₂ ^ˉ -N, and the aerobic zone and the short-range nitrification reactor 4 in the short-range nitrification reactor 4 A sludge return pipeline 46 that can return the sludge in the sedimentation zone to the aerobic zone is provided between the sedimentation zones, and the sewage in the short-path nitrification reactor 4 enters the anammox reactor 5 through the pipeline 51, and the sludge in the anammox The sewage entering the reactor 5 through the pipeline 51 and the pipeline 33 is mixed and stored, and under the action of the anammox bacteria enriched in the anammox reactor 5, the NH ₄ ⁺ -N in the influent and NO ₂ ^ˉ -N can be removed, and a small amount of NO ₃ ^ˉ -N will be produced at the same time. Part of the effluent of the anaerobic ammonium oxidation reactor 5 is discharged through the outlet pipe 55, and the other part is returned to the denitrification and phosphorus removal reaction through the sewage return pipe 57 Device 1 provides electron acceptors for denitrification and phosphorus removal bacteria, and removes nitrate in the reflux liquid.

Using the equipment of the utility model to carry out the denitrification and dephosphorization treatment of urban sewage comprises the following steps:

1) Denitrification and phosphorus removal: urban sewage (the total amount of sewage is denoted as Q) is pretreated by slag removal and enters the denitrification and phosphorus removal reactor 1 through the water inlet pipe 11, and then inoculated with the denitrification and phosphorus removal reactor obtained from the urban sewage plant. Activated sludge (SRT is 6d, HRT is 5h), and the sludge concentration MLSS after inoculation is 3000-4000mg/L. When electron acceptors are needed, stop the aeration facilities in the facultative oxygen zone and start the stirring facilities at the same time. At this time, the denitrification phosphorus removal reactor 1 is operating under anaerobic/anoxic conditions, and the denitrification phosphorus removal reactor 1 is rich in The integrated denitrification and phosphorus removal bacteria use the nitrogen oxides in the reflux liquid as electron acceptors to realize the simultaneous removal of nitrogen and phosphorus; When the electron acceptor required by phosphorus is used, the agitation is stopped and the aeration is turned on. At this time, the unit operates under anaerobic/aerobic conditions to achieve phosphorus removal;

2) Intermediate sedimentation tank: After urban sewage passes through the denitrification phosphorus removal reactor 1, most of the organic matter and phosphorus-containing substances are removed, and part of the nitrogen is also removed here; then, the mixed solution enters the intermediate sedimentation tank 2 for mud-water separation ; Part of the sludge in the middle sedimentation tank 2 (the amount of sludge is recorded as r, r=20%~50%Q) is returned to the anaerobic zone of the denitrification phosphorus removal reactor 1, and the rest of the sludge is discharged; A certain proportion enters the short-path nitrification reactor 4 and the anammox reactor 5 respectively;

3) Diverter: Introduce the effluent from the middle sedimentation tank 2 into the diverter 3, divide it into two parts in the diverter 3, and the first part is effluent (the amount of sewage is recorded as q ₁ , q ₁ =50%～70%Q) Enter the short-range nitrification reactor, the second part of the effluent (the amount of sewage is recorded as q ₂ , q ₂ =30%~50%Q) enters the anammox reactor, and passes through the online water quality analyzer on the anammox reactor 5 Carry out real-time monitoring of the nitrogen composition and content in the effluent of the anammox reactor 5, and output the result to the flow controller to control the proportion of sewage entering the short-path nitrification reactor 4 and the anammox reactor 5; when the effluent When the NH ₄ ⁺ -N content is high, reduce the amount of sewage entering the anammox reactor 5, and when the NO ₂ ^-N content in the effluent is high, increase the amount of sewage entering the anammox reactor 5; When the NO ₃ ^ˉ -N content in the effluent is high, increase the amount of sewage that flows back from the anammox reactor 5 to the denitrification phosphorus removal reactor 1 (the amount of sewage is denoted as R ₁ , R ₁ =50%～100%Q) ;

4) Short-range nitrification: The short-range nitrification reactor 4 adopts a continuous flow reaction device, which is put into the nitrification sludge obtained from the urban sewage plant. After inoculation, the sludge concentration MLSS is 3000-6000mg/L. The over-exposure pretreatment consumes the bacteria in the sludge, and then realizes the efficient operation of the short-cut nitrification under the conditions of controlling the temperature at 30°C, DO at 0.5mg/L, SRT at 8d, and HRT at 4h; the short-cut nitrification unit is rich in NO ₂ The effluent of ^ˉ -N and another part of the supernatant of the intermediate sedimentation tank enter the anammox reactor 5; the short-path nitrification reactor 4 realizes continuous aeration through the aeration facility 45 during the above-mentioned operation, and the DO measuring instrument 42 real-time Monitor the change of DO in the short-cut nitrification reactor 4, control the aeration rate through the fan 44 and the gas flow meter 43, monitor and control the sewage temperature at 30°C in real time through the temperature controller 41; realize the short-cut nitrification reactor through the sludge return pipe 46 4 The sludge in the sedimentation zone and the aeration zone is mixed; the regular sludge discharge and operation and maintenance of the short-range nitrification reactor 4 are realized through the vent pipe 47;

5) Anaerobic ammonium oxidation: Anaerobic ammonium oxidation reactor 5 adopts biofilm reactor with volcanic rock filter material, filling rate is 50%, upward flow operation mode, filtration rate is 1.8m/h, and its reaction is controlled The temperature is 25～35℃; under the action of the enriched anammox bacteria in this unit, the NH ₄ ⁺ -N and NO ₂ ^ˉ -N in the influent water are removed, and a small amount of NO ₃ ^ˉ - is produced at the same time Part of the effluent from N flows back to the denitrification and phosphorus removal reactor to provide electron acceptors for denitrification and phosphorus removal bacteria. At the same time, it can also further treat the residual nitrogen oxides in the effluent to improve the overall denitrification performance of the system. In addition, part of the effluent from the anammox reactor flows back to the short-path nitrification reactor (the amount of sewage is denoted as R ₂ , R ₂ =50%~100%Q).

In this example, the main indicators of influent water quality are as follows: COD: 200-300 mg/L, NH ₄ ⁺ -N: 15-30 mg/L, TN: 25-40 mg/L, TP: 2-4 mg/L, SS: 130~320mg/L, pH value: 6.9~7.1. According to the steps of the specific implementation above, after 3 months of domestication and cultivation, the effluent water quality of this set of devices is as follows: COD: <25.0mg/L, NH ₄ ⁺ -N: <1.0mg/L, TN: <7.0 mg/L, TP: <0.5mg/L, the quality of the effluent is far superior to the requirements of the first-class A standard of the "Integrated Wastewater Discharge Standard (GB8978-1996)". The analysis methods used in the test are in accordance with the standard methods in "Water and Wastewater Monitoring and Analysis Methods (Fourth Edition)".

SRT: sludge age; HRT: hydraulic retention time; MLSS: mixed liquor suspended solids concentration.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (6)

1. A kind of urban sewage denitrification and dephosphorization equipment, is characterized in that: comprise the denitrification dephosphorization reactor that is connected successively by main line, middle settling tank, shunt, short-range nitrification reactor and anaerobic ammonium oxidation reactor; Between the denitrification phosphorus removal reactor and the intermediate sedimentation tank, there is a sludge return pipe that can import the sludge in the intermediate sedimentation tank into the denitrification phosphorus removal reactor; between the denitrification phosphorus removal reactor and the anammox reactor There is a sewage return pipe that can lead the effluent of the anammox reactor into the denitrification dephosphorization reactor; between the splitter and the anammox reactor, there is a sewage return pipe that can lead the effluent of the splitter into the anammox The pipeline of the oxidation reactor; the sewage return pipe that can lead the effluent of the anammox reactor to the short-path nitrification reactor is provided between the short-path nitrification reactor and the anammox reactor; the anammox The reactor is equipped with an online water quality measuring instrument and a flow controller, and the flow controller is connected with a flow divider. 2. A kind of urban sewage denitrification and dephosphorization equipment according to claim 1, characterized in that: the denitrification dephosphorization reactor is provided with a water inlet pipe, a sludge return pipe, a sewage return pipe, an outlet pipe, and a venting pipe. pipes, aeration facilities and mixing facilities. 3. A kind of urban sewage denitrification and dephosphorization equipment according to claim 2, characterized in that: the denitrification dephosphorization reactor is composed of anaerobic zone and facultative oxygen zone, and the water inlet pipe and the sludge return pipe are arranged at In the anaerobic zone, sewage return pipes, outlet pipes, vent pipes, aeration facilities and stirring facilities are set in the facultative zone. 4. A device for denitrification and dephosphorization of urban sewage according to claim 1, characterized in that: said intermediate settling tank is provided with a water inlet pipe, a water outlet pipe and a sludge return pipe. 5. A kind of urban sewage denitrification and dephosphorization equipment according to claim 1, characterized in that: said short-path nitrification reactor is provided with water inlet pipe, water outlet pipe, sludge return pipe, sewage return pipe, vent pipe, Temperature controller, DO measuring instrument and aeration facility. 6. A kind of urban sewage denitrification and dephosphorization equipment according to claim 1, characterized in that: the anammox reactor is provided with a water inlet pipe, a water outlet pipe, a vent pipe, a backwash pipe, and a temperature controller .