CN207062088U - The sewage-treatment plant of total nitrogen is removed without additional carbon - Google Patents

Abstract

The utility model provides the sewage-treatment plant that a kind of no additional carbon removes total nitrogen, the device includes the anoxic pond being sequentially communicated, anaerobic pond, pre- Aerobic Pond, MBR ponds, sterilization and clear water reserviors and sludge-tank, the anoxic pond is connected with water inlet pipe, sterilization and clear water reserviors are connected with outlet pipe, and the manhole of convenient maintenance is equipped with above each pond, suction pump, air valve, blower fan electrically connect with switch board, realize the control of water inlet, aeration, backflow, spoil disposal and water outlet.Beneficial effect is to use the device, advantage nitrifier and denitrifying bacterium can be preferably enriched with, nitrification and denitrification are synchronously carried out, and can preferably remove total nitrogen, when removing total nitrogen, removing 1 TN needs 1.5-2 BOD, that is, removing 1mg/L TN needs 1.5-2mg/L BOD, during total nitrogen is removed, substantially reduce the consumption to carbon source, so that water inlet is in carbon source deficiency, and in the case of not adding carbon source in addition, it can preferably remove total nitrogen.

Description

The sewage-treatment plant of total nitrogen is removed without additional carbon

Technical field

A kind of sewage-treatment plant is the utility model is related to, the sewage of total nitrogen is removed more particularly, to a kind of no additional carbon Processing unit, perform effluent quality《Water environment quality standard (GB3838-2002)》The dirt of IV class (TN≤10) standard Water process.

Background technology

Printed and distributed in State Council《Water prevention and cure of pollution action plan》In mention, to select having prominent influence on quality of water environment Total nitrogen, the index such as total phosphorus, basin, regional pollution thing prediction emission the binding indicator system are included in research, and clearly Ask, during " 13 ", remittance eutrophication Hu Ku river and coastal region and above city should implement total nitrogen emission control, Schedule has also been put in total phosphorus control, will carry out control in part basin, region.

State Bureau of Environmental Protection's issue《Urban wastewater treatment firm pollutant emission standard》Exposure draft, propose first special Emission limit (special emission limit it is overall with《Water environment quality standard》(GB3838-2002) IV class water quality requirement Quite (except total nitrogen), can meet that the needs of controlling is discharged in ecological environment sensitizing range to sewage treatment plant.Meanwhile ammonia nitrogen and total Nitrogen index is proposed to meet the limit value of body eutrophication demand for control).This time revision is proposed for sensitizing range simultaneously Applicable special emission limit is, it is specified that the sewage discharge of ecological environment sensitizing range need to be improved to surface water IV class water quality requirements.It is special Require that processing effluent COD concentration is not higher than 30mg/L in other emission limit, SS concentration is not higher than 5mg/L.Thus, most domestic The existing sewage-treatment plant of sewage treatment plant can not meet new water quality requirement, the deficiency in which structure be present, anxious Transformation need to be optimized.

The content of the invention

The purpose of this utility model is to provide the sewage-treatment plant that a kind of no additional carbon removes total nitrogen, in favor of solving Sewage disposal at present occur carbon source deficiency, denitrogenation dephosphorizing treatment effect it is unstable not up to standard and add external carbon source remove total nitrogen The problems such as cost is high

The technical solution adopted in the utility model is to provide the sewage-treatment plant that a kind of no additional carbon removes total nitrogen, its In：The device includes the anoxic pond being sequentially communicated, anaerobic pond, pre- Aerobic Pond, MBR ponds, sterilization and clear water reserviors and sludge Pond, reflux I is provided with pre- Aerobic Pond, reflux II is provided with MBR ponds, MBR membrane modules are provided with MBR ponds, with MBR films The suction pump of component connection, pre- Aerobic Pond and MBR bottom of pond portion is equipped with micro-hole aerator, mixed liquor is connected with reflux I Return duct II, mixed-liquor return pipe I is connected with reflux II, on mixed-liquor return pipe I and mixed-liquor return pipe II Air valve is provided with, micro-hole aerator and MBR membrane modules are connected with being connected the blower fan of air duct, and the anoxic pond is connected with into water Pipe, is sterilized and clear water reserviors are connected with outlet pipe, and the manhole of convenient maintenance, suction pump, gas are equipped with above each pond Valve, blower fan electrically connect with switch board, realize the control of water inlet, aeration, backflow, spoil disposal and water outlet.

Effect of the present utility model is to use the device, can preferably be enriched with advantage nitrifier and denitrifying bacterium, and nitrification is made Synchronously carried out with denitrification, can preferably remove total nitrogen, when removing total nitrogen, removing 1 TN needs 1.5-2 BOD, that is, removing 1mg/L TN needs 1.5-2mg/L BOD, during total nitrogen is removed, substantially reduces to carbon source Consumption so that water inlet in the case of not adding carbon source in addition, can preferably remove total nitrogen in carbon source deficiency.

Brief description of the drawings

Fig. 1 is the schematic device that no additional carbon of the present utility model removes total nitrogen.

In figure：

1st, anoxic pond 2, anaerobic pond 3, pre- Aerobic Pond 4, MBR ponds 5, sterilization and clear water reserviors

6th, sludge-tank 7, reflux I 8, suction pump 9, reflux II 10, switch board

11st, micro-hole aerator 12, mixed-liquor return pipe I 13, mixed-liquor return pipe II 14, membrane module

15th, manhole 16, air valve 17, water inlet pipe 18, outlet pipe 19, blower fan 20, air duct

Embodiment

It is illustrated with reference to the sewage-treatment plant structure that accompanying drawing removes total nitrogen to no additional carbon of the present utility model.

As shown in figure 1, the sewage-treatment plant structure that no additional carbon of the present utility model removes total nitrogen is：The device bag The anoxic pond 1 being sequentially communicated, anaerobic pond 2, pre- Aerobic Pond 3, MBR ponds 4, sterilization and clear water reserviors 5 and sludge-tank 6 are included, it is pre- good Reflux I 7 is provided with oxygen pond 3, reflux II 9 is provided with MBR ponds 4, MBR membrane modules 14 are provided with MBR ponds 4, with MBR films The suction pump 8 that component 14 connects, pre- Aerobic Pond and MBR bottom of pond portion is equipped with micro-hole aerator 11, is connected with reflux I 7 Mixed-liquor return pipe II 13, mixed-liquor return pipe I 12 is connected with reflux II 9, in mixed-liquor return pipe I 12 and mixed liquor Air valve 16, micro-hole aerator 11 and MBR membrane modules 14 are provided with return duct II 13 with being connected the blower fan 19 of air duct 20 It is connected, the anoxic pond 1 is connected with water inlet pipe 17, sterilizes and clear water reserviors 5 are connected with outlet pipe 18, and above each pond Be equipped with the manhole 15 of convenient maintenance, suction pump 8, air valve 16, blower fan 19 electrically connect with switch board 10, realize water inlet, aeration, The control of backflow, spoil disposal and water outlet.

The anoxic pond 1, anaerobic pond 2, pre- Aerobic Pond 3, the sludge age in MBR ponds 4 are more than 180d, nitrification and anti- Nitrification is synchronously carried out.

What the sewage-treatment plant function that no additional carbon of the present utility model removes total nitrogen was realized in：

1：The sewage that will intake of water inlet pipe 17 is divided into four parts, and using multipoint water feeding mode, 75% enters anoxic pond 1, and 15% Into anaerobic pond 2,5% enters pre- Aerobic Pond 3, and remaining 5% enters MBR ponds 4；Intake by the way of multipoint water feeding, according to Certain proportion has respectively entered different process section, preferably can be distributed carbon source；

2：The mixed liquor of 75% water inlet and the backflow of pre- Aerobic Pond 3 carries out hybrid reaction, hydraulic detention time in anoxic pond 1 For 3h, under anoxic conditions by the denitrification of denitrifying bacterium by from the nitrate transformation that the backflow of pre- Aerobic Pond 3 is brought into Nitrogen is overflowed into air；

3：After the processing of anoxic pond 1, sewage enters the mixing of the water inlet and the backflow of MBR ponds 4 in anaerobic pond 2 with 15% Liquid carries out hybrid reaction, under anaerobic, the nitrate brought into is flowed back under the denitrification of denitrifying bacterium from MBR ponds 4 Change into nitrogen to overflow into air, the residence time of anaerobism section is 3h；

4：After the processing of anaerobic pond 2, sewage enters in pre- Aerobic Pond 3, the water inlet hybrid reaction with 15%, pre- aerobic Section, bottom of pond is provided with micro-hole aerator 11, and using the using and the reserved of air blower 19, nitrobacteria is by the ammonia nitrogen in sewage and organic nitrogen ammonia Ammonia nitrogen is melted into, by the nitrification of nitrifier, by mineralized nitrogen into nitrate, residence time of pre- aerobic section is 2h, water outlet Dissolved oxygen control passes through mixed-liquor return pipe II 13 in 1.0-1.5mg/L, the mixed liquor of pre- aerobic section by reflux I 7 Anoxic pond 1 is back to, wherein backflow uses stripping reflux device I 7, reflux ratio is 100% -200%, and this backflow is normally opened, is led to The regulation of valve 16 is crossed to control capacity of returns, adds chemical dephosphorization device at this stage, carries out dephosphorization；

5：After the processing of pre- Aerobic Pond 3, sewage enters in MBR ponds 4, the water inlet hybrid reaction with 5%, wherein use It is aerobic MBR, MBR membrane modules 14 is placed in Aerobic Pond, bottom of pond is provided with micro-hole aerator 11, carries out biological nitration effect, Nitrobacteria by the ammonia nitrogen in sewage and organic nitrogen ammonification into ammonia nitrogen, by the nitrification of nitrifier, by mineralized nitrogen into nitre Hydrochlorate, residence time 4h；Under condition of negative pressure caused by suction pump 8, the water in mixed liquor is completed by Flat Membrane in MBR ponds Separation of solid and liquid, sludge are sunk, and mixed liquor is back in anaerobic pond 2 by reflux II 9 by mixed-liquor return pipe I 12, its Middle backflow is same use stripping reflux device, and reflux ratio is 100% -200%, this backflow be it is normally opened, by the regulation of valve 16 come Capacity of returns is controlled, excess sludge enters sludge-tank 6, and caused sludge quantity is seldom, and about 4-6 month spoil disposals are once；MBR ponds 4 In micro-hole aerator and the air quantity source blower fan 19 of the aeration of membrane module is conveyed by air duct 20, blower fan 19 1 is with one It is standby.

6th, anoxic pond 1, anaerobic pond 2, pre- Aerobic Pond 3, the sludge age in MBR ponds 4 are more than 180d, can be enriched with advantage well Nitrifier and denitrifying bacterium, nitrification and denitrification synchronously progress, can preferably remove total nitrogen under the conditions of being somebody's turn to do.

7：Entered the water outlet of MBR ponds 4 and then go through sterilization and clear water reserviors 5, residence time 2h, this method removes 1 TN 1.5-2 BOD are needed, that is, removing 1mg/L TN needs 1.5-2mg/L BOD, during total nitrogen is removed, subtracts significantly The small consumption to carbon source.Effluent quality performs《Water environment quality standard (GB3838-2002)》IV class (TN≤10) is marked Standard, effluent index COD:25— 30mg/L、BOD：4—6mg/L、SS≤1mg/L、TP：0.2—0.3mg/L、NH3-N：1- 3mg/L、 TN：9-10mg/L, then discharged by outlet pipe 18, be emitted into river course or pipe network.

8th, by being provided with automatic control system in switch board 10, realize water inlet, aeration, backflow, spoil disposal and water outlet from Dynamicization controls.

9th, it is designed with people above anoxic pond 1, anaerobic pond 2, pre- Aerobic Pond 3, MBR ponds 4, sterilization and 5 each pond of clear water reserviors Hole 15, convenient maintenance.

Claims (2)

1. a kind of no additional carbon removes the sewage-treatment plant of total nitrogen, it is characterized in that：The device include be sequentially communicated lack Oxygen pond (1), anaerobic pond (2), pre- Aerobic Pond (3), MBR ponds (4), sterilization and clear water reserviors (5) and sludge-tank (6), pre- Aerobic Pond (3) reflux I (7) is provided with, reflux II (9) is provided with MBR ponds (4), MBR membrane modules are provided with MBR ponds (4) (14) suction pump (8), being connected with MBR membrane modules (14), pre- Aerobic Pond and MBR bottom of pond portion are equipped with micro-hole aerator (11), Mixed-liquor return pipe II (13) is connected with reflux I (7), mixed-liquor return pipe I is connected with reflux II (9) (12) air valve (16), micro-hole aerator (11), are provided with mixed-liquor return pipe I (12) and mixed-liquor return pipe II (13) And MBR membrane modules (14) are connected with being connected the blower fan (19) of air duct (20), the anoxic pond (1) is connected with water inlet pipe (17), sterilize and clear water reserviors (5) are connected with outlet pipe (18), and the manhole of convenient maintenance is equipped with above each pond (15), suction pump (8), air valve (16), blower fan (19) electrically connect with switch board (10), realize water inlet, aeration, backflow, spoil disposal And the control of water outlet.

2. the sewage-treatment plant of total nitrogen is removed without additional carbon according to claim 1, it is characterized in that：The anoxic pond (1), anaerobic pond (2), pre- Aerobic Pond (3), the pond that MBR ponds (4) are more than sludge age 180d.