CN217148712U - Coupling denitrification system - Google Patents
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- CN217148712U CN217148712U CN202123242100.XU CN202123242100U CN217148712U CN 217148712 U CN217148712 U CN 217148712U CN 202123242100 U CN202123242100 U CN 202123242100U CN 217148712 U CN217148712 U CN 217148712U
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Abstract
The utility model relates to a sewage treatment technical field provides a coupling denitrogenation system. The utility model provides a coupling denitrogenation system improves anaerobic ammonium oxidation's total nitrogen clearance to more than 90%, improves the denitrogenation load of biomembrane anaerobic ammonium oxidation technology. Meanwhile, the sludge inoculation of the system is carried out in the granular sludge reactor, the anaerobic ammonium oxidation sludge is convenient to inoculate, the anaerobic ammonium oxidation strain is taken out, mechanical facilities such as a crane and a forklift are not needed in the inoculation process, and the labor cost is reduced by 90% in the construction process; and the operation is stable; meanwhile, the operation with water can be realized, and the inoculation of the anaerobic ammonia oxidation sludge can be realized under the condition of no production stop. Solves the problems of high cost, long time consumption, difficult or even impossible to implement in actual engineering for inoculating strains in the biofilm anaerobic ammonia oxidation process.
Description
Technical Field
The utility model relates to a sewage treatment technical field especially relates to a coupling denitrogenation system.
Background
The anaerobic ammonia oxidation process is the most advanced international biological denitrification process at present, ammonia nitrogen and nitrite nitrogen are directly converted into nitrogen under the action of anaerobic ammonia oxidizing bacteria, and compared with the traditional biological denitrification process, the anaerobic ammonia oxidation process has the advantages of high denitrification load, low operation cost, no residual sludge, emission reduction of greenhouse gases and the like. The integrated biological membrane anaerobic ammonia oxidation process has the advantages of stable operation, strong impact load resistance and wide limitation conditions on the concentration of suspended matters, COD (chemical oxygen demand) and toxic substances of inlet water, and can be widely applied to the treatment of various high ammonia nitrogen industrial wastewater.
The starting process of the anaerobic ammonia oxidation engineering project needs to inoculate a large amount of anaerobic ammonia oxidation bacteria, but the anaerobic ammonia oxidation bacteria of the integrated biofilm anaerobic ammonia oxidation process mainly exist on a carrier in a system, only the anaerobic ammonia oxidation bacteria in the carrier form can be used as inoculated sludge, the processes of taking out, transporting, inoculating and the like of the carrier of the anaerobic ammonia oxidation bacteria from the integrated biofilm reactor are long in time consumption, large in workload and high in cost, particularly, the carrier is taken out from a reactor which normally runs, a new carrier is reinstalled into a tank, water inflow of the system needs to be stopped, the liquid level of the reaction tank is reduced, the carrier is lifted out from the reaction tank by using large-scale mechanical equipment, the time consumption of the carrier taking-out process generally needs 7-14 days, the new carrier installation needs 3-7 days, the total water stop time needs 10-21 days, the general wastewater treatment facility basically runs at full load, and due to the pressure of the treated water volume, long-time water cut-off cannot be realized.
The integrated anaerobic ammonia oxidation process theoretically has the total nitrogen removal rate of 89 percent (generally only reaching 80 percent) and low total nitrogen removal rate; the direct water outlet is difficult to reach the discharge standard.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a coupled denitrification system. The coupled denitrification system provided by the utility model can efficiently remove the total nitrogen; and the anaerobic ammonium oxidation sludge is convenient to inoculate.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
the utility model provides a coupling denitrification system, which comprises an integrated biomembrane reactor; the integrated bio-membrane reactor is provided with a reactor water inlet and a reactor water outlet, and the reactor water inlet or the reactor water outlet is communicated with the granular sludge reactor;
the granular sludge reactor comprises a granular sludge reactor body;
the inner cavity of the granular sludge reactor body is sequentially provided with a water distributor, a sludge inoculation port, a gas separator and an inclined plate from bottom to top;
a water weir groove is arranged at the outer top of the granular sludge reactor body; in the vertical direction, the water weir groove is positioned above the inclined plate;
the granular sludge reactor is communicated with a reactor water inlet of the integrated biological membrane reactor through a water weir groove; or:
the integrated biomembrane reactor is communicated with a water distributor of the granular sludge reactor through a reactor water outlet.
Preferably, the granular sludge reactor body is a cylinder; the height of the granular sludge reactor body is 10-20 m.
Preferably, the inner cavity of the granular sludge reactor body is also provided with a stirrer; in the vertical direction, the stirrer is positioned between the water distributor and the gas separator.
Preferably, the granular sludge reactor further comprises a return pipe; the return pipe is positioned outside the granular sludge reactor body, and one end of the return pipe is communicated with the water distributor; in the vertical direction, the other end of the return pipe is located 0.5-1 m below the gas separator.
Preferably, a return pump is arranged on the pipeline of the return pipe.
Preferably, the integrated biofilm reactor further comprises an integrated biofilm reactor body; the inner cavity of the integrated biofilm reactor body is filled with filler, an aerator positioned at the bottom of the filler, a blower communicated with the aerator and positioned at the outer side of the integrated biofilm reactor body, and a sludge inlet positioned at the bottom of the integrated biofilm reactor body.
Preferably, the coupled denitrification system further comprises a regulating tank and a sedimentation tank; the sedimentation tank is provided with a sedimentation tank water inlet, a sedimentation tank water outlet and a sludge outlet;
the regulating tank is communicated with the granular sludge reactor through a water distributor;
the granular sludge reactor is communicated with a reactor water inlet of the integrated biological membrane reactor through a water weir groove;
the integrated biofilm reactor is communicated with a water inlet of a sedimentation tank of the sedimentation tank through a water outlet of the reactor;
the sludge outlet of the sedimentation tank is respectively communicated with the integrated biofilm reactor and the granular sludge reactor;
or:
the regulating tank is communicated with the integrated biofilm reactor through a water inlet of the reactor;
the integrated biofilm reactor is communicated with a water distributor of the granular sludge reactor through a reactor water outlet;
the granular sludge reactor is communicated with a water inlet of a sedimentation tank of the sedimentation tank through a water weir groove;
and a sludge outlet of the sedimentation tank is communicated and refluxed to the integrated biofilm reactor.
The utility model provides a coupling denitrification system, which comprises an integrated biomembrane reactor; the integrated biofilm reactor is provided with a reactor water inlet and a reactor water outlet, and the reactor water inlet or the reactor water outlet is communicated with the granular sludge reactor; the granular sludge reactor comprises a granular sludge reactor body; the inner cavity of the granular sludge reactor body is sequentially provided with a water distributor, a sludge inoculation port, a gas separator and an inclined plate from bottom to top; a water weir groove is arranged at the outer top of the granular sludge reactor body; in the vertical direction, the water weir groove is positioned above the inclined plate; the granular sludge reactor is communicated with a reactor water inlet of the integrated biological membrane reactor through a water weir groove; or: the integrated biomembrane reactor is communicated with a water distributor of the granular sludge reactor through a reactor water outlet.
The utility model provides a coupling denitrogenation system improves anaerobic ammonium oxidation's total nitrogen clearance to more than 90%, improves the denitrogenation load of biomembrane anaerobic ammonium oxidation technology. Meanwhile, the sludge of the system is inoculated in the granular sludge reactor without closing the integrated biological membrane reactor; moreover, the processes of inoculation and taking out in the granular sludge reactor are convenient, mechanical facilities such as cranes, forklifts and the like are not needed, and the labor cost is reduced by 90% in the construction process; and the operation is stable; meanwhile, the operation with water can be realized, and the inoculation of the anaerobic ammonia oxidation sludge can be realized under the condition of no production stop. Solves the problems of high cost, long time consumption, difficult or even impossible to implement in actual engineering for inoculating strains in the biofilm anaerobic ammonia oxidation process.
Drawings
FIG. 1 is a schematic structural view of a granular sludge reactor provided by the present invention;
FIG. 2 is a schematic diagram of an integrated biofilm reactor for use in the present invention;
FIG. 3 is a coupled denitrification system of a granular sludge reactor before an integrated biofilm reactor;
FIG. 4 is a coupled denitrification system with a granular sludge reactor after an integrated biofilm reactor;
wherein, 1 is a granular sludge reactor, 11 is a granular sludge reactor body, 12 is a water distributor, 13 is a gas separator, 14 is an inclined plate, 15 is a sludge inoculation port, 16 is a stirrer, 17 is a return pipe, and 18 is a water weir groove;
2, an integrated biofilm reactor, 20, a reactor water inlet, a blower, an aerator, a filler, a reactor water outlet and a sludge inlet, 21, 22 and 25, wherein the integrated biofilm reactor is an integrated biofilm reactor body;
3 is a regulating tank;
4 is a sedimentation tank, 41 is a sedimentation tank water inlet, 42 is a sedimentation tank water outlet, and 43 is a sludge outlet.
Detailed Description
The utility model provides a coupling denitrification system, which comprises an integrated bio-membrane reactor 2; the integrated bio-membrane reactor 2 is provided with a reactor water inlet 21 and a reactor water outlet 25, and the reactor water inlet 21 or the reactor water outlet 25 is communicated with the granular sludge reactor 1;
the granular sludge reactor 1 comprises a granular sludge reactor body 11;
the inner cavity of the granular sludge reactor body 11 is sequentially provided with a water distributor 12, a sludge inoculation port 15, a gas separator 13 and an inclined plate 14 from bottom to top;
a water weir groove 18 is arranged at the outer top of the granular sludge reactor body 11; the weir grooves 18 are located above the inclined plates 14 in the vertical direction;
the granular sludge reactor 1 is communicated with a reactor water inlet 21 of the integrated biological membrane reactor 2 through a water weir groove 18; or:
the integrated bio-membrane reactor 2 is communicated with the water distributor 12 of the granular sludge reactor 1 through a reactor water outlet 25.
In the present invention, the raw materials used in the present invention are preferably commercially available products unless otherwise specified.
In the utility model, the positions of the integrated biological membrane reactor and the granular sludge reactor in the coupled denitrification system are determined according to whether the wastewater to be treated contains toxic and harmful substances, and when the toxic and harmful substances do not exist in the wastewater to be treated, the granular sludge reactor is arranged at the front end of the integrated biological membrane reactor; when toxic and harmful substances exist in the wastewater to be treated, the granular sludge reactor is arranged at the rear end of the integrated biological membrane reactor.
The utility model provides a coupling denitrification system, which comprises a granular sludge reactor 1; the schematic structural diagram of the granular sludge reactor 1 is shown in fig. 1, and the structure of the granular sludge reactor 1 in the coupled denitrification system of the present invention is described in detail with reference to fig. 1.
In the present invention, the granular sludge reactor 1 includes a granular sludge reactor body 11.
In the present invention, the granular sludge reactor body 11 is preferably a cylinder. In the utility model, the height of the granular sludge reactor body 11 is preferably 10-20 m; the diameter is preferably 3 to 10 m. In the present invention, the material of the granular sludge reactor body 11 is preferably carbon steel or stainless steel.
The utility model discloses in, the inner chamber of granular sludge reactor body 11 has set gradually water-locator 12, mud inoculation mouth 15, gas separator 13 and swash plate 14 by bottom to top.
In the present invention, the water distributor 12 is preferably located at the bottom of the inner cavity of the granular sludge reactor body 11.
In the present invention, the inclination of the inclined plate 14 relative to the horizontal plane is preferably 45 to 60 °. In the present invention, the material of the sloping plate 14 preferably comprises plastic or stainless steel.
In the present invention, the sludge inoculation port 15 is preferably provided on the side wall of the granular sludge reactor body 11.
In the utility model, a water weir groove 18 is arranged at the outer top of the granular sludge reactor body 11; the weir trough 18 is located above the sloping plate 14 in the vertical direction.
In the utility model, the inner cavity of the granular sludge reactor body 11 is preferably provided with a stirrer 16; in the vertical direction, the stirrer 16 is preferably located between the water distributor 12 and the gas separator 13.
In the present invention, the granular sludge reactor 1 preferably further comprises a return pipe 17, and the return pipe 17 is preferably located outside the granular sludge reactor body 11; one end of the return pipe 17 is preferably communicated with the water distributor 12; the other end of the return pipe 17 is located 0.5-1 m below the gas separator 13 in the vertical direction.
In the present invention, a reflux pump 19 is preferably provided on the pipeline of the reflux pipe 17.
The utility model provides a coupling denitrogenation system includes integration biofilm reactor 2. Fig. 2 is a schematic structural diagram of the integrated biofilm reactor provided by the present invention, and the integrated biofilm reactor 2 provided by the present invention is described in detail below with reference to fig. 2.
In the present invention, the integrated biofilm reactor 2 comprises a reactor water inlet 21, an integrated biofilm reactor body 20 and a reactor water outlet 25.
In the present invention, the inner cavity of the integrated bio-membrane reactor body 20 is filled with a filler 24. In the utility model, the filler is preferably a combined filler made of polyurethane and polypropylene materials; more preferably, the polypropylene filler is used as a framework, and the polyurethane filler is arranged on the polypropylene filler; the functional microorganisms are mainly attached to the polyurethane filler. In the utility model discloses in, the preferred filling amount of filler in integrated biofilm reactor is 40 ~ 60%. The filler is preferably fixed on a steel structure arranged in the integrated biofilm reactor through a stainless steel wire; the distance between the stainless steel wires is preferably 100-200 mm.
In the present invention, the integrated biofilm reactor body 20 includes an aerator 23 located at the bottom of the packing 24.
In the present invention, the integrated biofilm reactor body 20 comprises a blower 22 in communication with the aerator 23 and located outside the integrated biofilm reactor body 20.
In the present invention, the integrated bio-membrane reactor body 20 comprises a sludge inlet 26 located at the bottom of the integrated bio-membrane reactor body 20.
The utility model discloses in, work as granular sludge reactor 1 is in during the place ahead of integration biofilm reactor 2, granular sludge reactor 1 through water weir groove 18 with integration biofilm reactor 2's reactor water inlet 21 intercommunication.
In the present invention, when the granular sludge reactor 1 is located behind the integrated biofilm reactor 2, the integrated biofilm reactor 2 is communicated with the water distributor 12 of the granular sludge reactor 1 through the reactor water outlet 25.
The utility model provides a coupling denitrogenation system still includes equalizing basin 3 and sedimentation tank 4.
In the present invention, the sedimentation tank 4 preferably includes a sedimentation tank water inlet 41, a sedimentation tank water outlet 42, and a sludge outlet 43.
In the utility model, the granular sludge reactor 1 can be arranged before the integrated biological membrane reactor 2 or behind the integrated biological membrane reactor 2; the complete schematic of the coupled denitrification system has two cases, as shown in fig. 3 and fig. 4, respectively.
The coupled denitrification system of the granular sludge reactor 1 before the integrated biofilm reactor 2 is described below with reference to fig. 3.
The utility model provides a coupling denitrification system, which comprises a regulating tank 3, a granular sludge reactor 1, an integrated bio-membrane reactor 2 and a sedimentation tank 4 which are communicated in sequence; the regulating tank 3 is communicated with the granular sludge reactor 1 through a water distributor 12; the granular sludge reactor 1 is communicated with a reactor water inlet 21 of the integrated biological membrane reactor 2 through a water weir groove 18; the integrated biofilm reactor 2 is communicated with a sedimentation tank water inlet 41 of a sedimentation tank 4 through a reactor water outlet 25; and a sludge outlet 43 of the sedimentation tank 4 is respectively communicated with the integrated biofilm reactor 2 and the granular sludge reactor 1. The utility model discloses in, on the pipeline between the mud-outlet 43 of sedimentation tank 4 and the integration biofilm reactor 2 on the pipeline between the mud-outlet 43 of sedimentation tank 4 and the granular sludge reactor 1 preferably set up the backwash pump.
The coupled denitrification system of the granular sludge reactor 1 after the integrated biofilm reactor 2 is described below with reference to fig. 4.
The utility model provides a coupling denitrification system, which comprises a regulating tank 3, an integrated biomembrane reactor 2, a granular sludge reactor 1 and a sedimentation tank 4 which are communicated in sequence; the regulating tank 3 is communicated with the integrated biofilm reactor 2 through a reactor water inlet 21; the integrated bio-membrane reactor 2 is communicated with a water distributor 12 in the granular sludge reactor 2 through a reactor water outlet 25; the granular sludge reactor 2 is communicated with a sedimentation tank water inlet 41 of the sedimentation tank 4 through a water weir groove 18; and a sludge outlet 43 of the sedimentation tank 4 is communicated and reflows to the integrated biomembrane reactor 2.
The utility model discloses in, the preferred backwash pump that is provided with on the pipeline of the mud outlet 43 intercommunication backward flow of sedimentation tank 4.
In the utility modelIn the novel process, the treatment capacity of the coupled denitrification system is preferably 4000-5000 m 3 /d。
The method for coupled denitrification by using the coupled denitrification system of FIG. 3 comprises the following steps:
the wastewater flows into a regulating tank 3 for regulation;
the regulated wastewater enters the granular sludge reactor 1 from the water distributor 12 to carry out anaerobic ammoxidation reaction of the granular sludge, and sludge reaction purified water is obtained;
the sludge reaction purified water enters the integrated biological membrane reactor 2 from a reactor water inlet 21 to carry out integrated biological membrane anaerobic ammonia oxidation reaction to obtain anaerobic ammonia oxidation purified water;
the anaerobic ammonia oxidation purified water enters the sedimentation tank 4 from a water inlet 41 of the sedimentation tank to obtain purified water.
The utility model discloses flow into equalizing basin 3 with waste water and adjust.
The utility model discloses in, the waste water is preferably coal chemical industry waste water, landfill leachate, fermentation class pharmacy waste water or sludge digestion liquid of producing. The utility model discloses in, COD in the waste water is 700 ~ 1500 mg/L, and ammonia nitrogen concentration is 500 ~ 2500 mg/L.
In the present invention, the conditioning agent preferably comprises one or more of sodium hydroxide, sodium bicarbonate and sodium carbonate. In the utility model discloses, the pH value of regulation is preferably 7.0 ~ 8.0. In the present invention, the purpose of the adjustment is to regulate the pH of the system.
After the waste water after obtaining the regulation, the utility model discloses the waste water after will regulating gets into granular sludge reactor 1 by water-locator 12 and carries out granular sludge anaerobic ammonia oxidation reaction, obtains the sludge reaction purified water.
In the utility model, before the granular sludge reactor performs the anaerobic ammonium oxidation reaction of the granular sludge, the granular sludge reactor preferably further comprises the step of performing anaerobic ammonium oxidation sludge inoculation on the granular sludge reactor through the sludge inoculation port; the parameters for anaerobic ammonia oxidation sludge inoculation include: after the sludge is inoculated, the sludge concentration in the granular sludge reactor is preferably 1500-3000 mg/L.
The utility model discloses in, during the granular sludge anaerobic ammonia oxidation reaction, the preferred 3 ~ 8m/h of liquid upflow speed in the granular sludge reactor.
After obtaining sludge reaction purified water, the utility model discloses will sludge reaction purified water gets into integration biofilm reactor 2 by reactor water inlet 21, carries out integration biofilm anaerobic ammonium oxidation reaction, obtains anaerobic ammonium oxidation purified water.
The utility model discloses in, the temperature of integration biomembrane anaerobic ammonium oxidation reaction is 30 ~ 35 ℃, and the pH value is preferred 7.0 ~ 8.0.
The utility model discloses in, in integrated biofilm reactor's the play water: the proportion of ammonia nitrogen to nitrite state concentration is preferably 1: 1.32, the ammonia nitrogen concentration is 20-50 mg/L, the nitrite nitrogen concentration is 25-60 mg/L, the reactor DO is less than 0.1mg/L, and the pH value is preferably 7.0-8.0.
After the anammox purified water is obtained, the utility model discloses will anammox purified water gets into sedimentation tank 4 by sedimentation tank water inlet 41, obtains purifying out water.
The utility model discloses it is right the time of sediment does not do specifically inject, as long as can realize the sediment can.
The utility model discloses in, deposit preferably still to obtain sediment mud, sediment mud is preferred to be returned to granular sludge reactor or integration biofilm reactor through the backwash pump.
In the utility model, the granular sludge reactor can intercept anaerobic ammonia oxidation granular sludge; the return sludge utilizes the organic matter of the inlet water and nitrate nitrogen brought by the return sludge to carry out short-cut denitrification to generate nitrite nitrogen, and meanwhile, the return sludge also contains the nitrite nitrogen; anaerobic ammonia oxidation granular sludge in the granular sludge reactor utilizes nitrite nitrogen generated by short-range denitrification and nitrite nitrogen in returned sludge to oxidize ammonia nitrogen, so as to realize total nitrogen removal.
The method for coupled denitrification by using the coupled denitrification system shown in FIG. 4 comprises the following steps:
the wastewater flows into a regulating tank 3 for regulation;
the regulated wastewater enters an integrated biomembrane reactor 2 from a reactor water inlet 21 to carry out integrated biomembrane anammox reaction to obtain anammox purified water;
the anaerobic ammonia oxidation purified water enters a granular sludge reactor 1 from a water distributor 12 to carry out anaerobic ammonia oxidation reaction on granular sludge, so that sludge reaction purified water is obtained;
and (3) allowing the sludge reaction purified water to enter a sedimentation tank 4 from a sedimentation tank water inlet 41 for sedimentation to obtain purified water.
In the method for coupled denitrification by using the coupled denitrification system shown in fig. 4, except that the integrated biofilm anaerobic ammonia oxidation reaction and the granular sludge anaerobic ammonia oxidation reaction have the sequence, the other parameters are consistent with the parameters of the method for coupled denitrification by using the coupled denitrification system shown in fig. 3.
The coupled denitrification system provided by the present invention is described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
In the coupled denitrification system shown in FIG. 3, the granular sludge reactor body is a cylinder with a diameter of 10m and an effective volume of 785m 3 (ii) a The integrated bio-membrane reactor is internally provided with immobilized filler, the filling ratio of the filler is 50% of the tank volume of the reactor, the filler is combined filler made of polyurethane and polypropylene materials, 6 pieces of polyurethane filler with the thickness of 80mm multiplied by 10mm are fixed on a filler plate made of polypropylene materials by the combined filler, the polyurethane filler is fixed on a steel structure arranged in the integrated bio-membrane reactor through stainless steel wires, the distance between the stainless steel wires is 150mm, and the bio-membrane is attached to the filler.
The COD concentration of the effluent of the anaerobic reactor of a certain food processing enterprise is 650mg/L, the ammonia nitrogen concentration is 500mg/L, the original anaerobic effluent is denitrified by adopting the traditional nitrification and denitrification process, the sludge settleability is poor due to denitrification, the sludge in the system is difficult to effectively intercept, the operation is unstable, and the stable standard discharge is difficult to realize; because 20-25% of raw water is used for providing an organic carbon source in the denitrification process, the anaerobic treatment water quantity is reduced, and the methane yield is reduced by 20-25%; meanwhile, the aeration energy consumption is high, the sludge yield is high, and the sludge treatment cost is high.
In order to solve this problem, the coupled denitrification system described in FIG. 3 is used for treatment; the sludge of the integrated biomembrane reactor completely returns to the granular sludge reactor, enters the granular sludge reactor together with water in the regulating tank through a water distributor at the bottom in the granular sludge reactor, and is inoculated with sludge at the initial stage to form anaerobic ammonia oxidation granular sludge; inoculating anaerobic ammonium oxidation granular sludge, and pumping the inoculated anaerobic ammonium oxidation granular sludge into the granular sludge reactor through a sludge inoculation port on the side wall of the granular sludge reactor, wherein the inoculation amount is 15.7m 3 The sludge concentration of the granular sludge in the granular sludge reactor after sludge inoculation is controlled to be 1500-3000 mg/L, the sludge quantity m which needs to be inoculated is calculated according to the water content (P%) of the inoculated sludge, the sludge concentration (C) of the sludge in the granular sludge reactor and the volume (V) of the granular sludge reactor, wherein m is C multiplied by V/P, the water content P of the inoculated granular sludge in the project is 90%, the sludge concentration C after inoculation is controlled to be 2000mg/L, and the volume of the granular sludge reactor is 785 m/L 3 The inoculation sludge was calculated to be 2000 × 785 ÷ 0.1 ÷ 1000000 ═ 15.7 t.
The inlet water is lifted to a granular sludge reactor by a lift pump, and the inlet water flow is 5000m 3 The sludge return flow of the integrated biofilm reactor is 5000m 3 Completely reflowing to the granular sludge reactor, wherein the flow rate of a reflux pump of an internal circulation pipeline of the granular sludge reactor is 0, the rising flow rate of liquid in the granular sludge reactor is 5.3m/h, the ammonia nitrogen concentration of the reflowed sludge of the integrated biofilm reactor is 10mg/L, nitrite nitrogen is 20mg/L, nitrate nitrogen is 20mg/L, the granular sludge reactor contains reflowed sludge, and the reflowed sludge is subjected to short-range denitrification by utilizing organic matters in inlet water and 20mg/L nitrate in the reflowed sludge to generate about 18mg/L nitrite nitrogen; and the return sludge also carries 20mg/L nitrite nitrogen, and the generated nitrite nitrogen and nitrite state in the return sludge are both used as substrates of anaerobic ammonia oxidation granular sludge to convert ammonia nitrogen in the inlet water into nitrogen.
The ammonia nitrogen concentration of the effluent of the granular sludge reactor is 250mg/L, nitrate nitrogen and nitrite nitrogen are not contained, the effluent of the granular sludge reactor enters an integrated biomembrane reactor, the temperature of the integrated biomembrane reactor is controlled to be 30-35 ℃, the pH is controlled to be 7.0-8.0, the DO at the head end of the integrated biomembrane reactor is less than 0.5mg/L, the DO at the tail end of the integrated biomembrane reactor is less than 1.0mg/L, short-range nitration reaction and anaerobic ammonia oxidation occur simultaneously, the ammonia nitrogen concentration of the effluent of the integrated biomembrane reactor is 10mg/L, the nitrite nitrogen is 20mg/L, the nitrate nitrogen is 20mg/L, the TN of the effluent is 50mg/L, and the removal rate of TN is 90 percent, which is higher than that of a conventional anaerobic ammonia oxidation system.
The granular sludge and floc sludge exist in the granular sludge reactor of the coupled denitrification system, the system runs stably after running for 6 months, and 15m sludge is taken out from the granular sludge reactor 3 Anaerobic ammonia oxidation granular sludge is used as seed sludge, before taking the sludge, a water inlet and a reflux pump on a reflux pipe connected with a granular sludge reactor are stopped, the reflux pump on a sludge reflux pipeline of an integrated biomembrane reactor and a sedimentation tank is closed, the granular sludge is directly transported to a tank car from a sludge inoculation pipe at the bottom, a valve of the sludge inoculation pipe is opened after 10min, and the granular sludge is put into the tank car.
Example 2
In the coupled denitrification system shown in FIG. 4, the granular sludge reactor body is a cylinder with a diameter of 8m and an effective volume of 502m 3 (ii) a The integrated bio-membrane reactor is internally provided with immobilized filler, the filling ratio of the filler is 60 percent of the tank volume of the reactor, the filler is combined filler made of polyurethane and polypropylene materials, 6 pieces of polyurethane filler with the thickness of 80mm multiplied by 10mm are fixed on a filler plate made of polypropylene materials by the combined filler, the polyurethane filler is fixed on a steel structure arranged in the integrated bio-membrane reactor through stainless steel wires, the distance between the stainless steel wires is 150mm, and the bio-membrane is attached to the filler.
The COD concentration of a certain chemical wastewater is about 700mg/L, the ammonia nitrogen concentration is 700mg/L, and the wastewater contains substances for inhibiting the granular sludge, the rear end of the integrated biological membrane reactor arranged in the granular sludge reactor is used as a deep denitrification system of the integrated biological membrane reactor, and meanwhile, the sludge cultured in the granular sludge reactor can be used as anaerobic ammonia oxidation sludge to be inoculated to other projects.
The water inlet flow of the system is 5000m 3 D, passing water inAnd lifting the mixed liquor sludge to an integrated biofilm reactor by a water inlet pump, wherein the concentration of the mixed liquor sludge in the integrated biofilm reactor is 2500mg/L, the temperature of the integrated biofilm reactor is controlled to be 30-35 ℃, the pH is controlled to be 7.0-8.0, the DO at the head end of the integrated biofilm reactor is less than 0.2mg/L, the DO at the tail end of the integrated biofilm reactor is controlled to be less than 1.0mg/L, the shortcut nitrifying bacteria in the mixed liquor in the integrated biofilm reactor convert ammonia nitrogen into nitrite nitrogen, and the anaerobic ammonia oxidizing bacteria on the biofilm convert ammonia nitrogen into nitrogen. The mixed liquid of the integrated biomembrane reactor is lifted by a water inlet pump to enter the bottom of the granular sludge reactor, and the flow of the water inlet pump of the granular sludge reactor is 9000m 3 And d, intercepting and enriching anaerobic ammonia oxidation granular sludge in the granular sludge reactor, converting ammonia nitrogen and nitrite nitrogen in mixed liquor by anaerobic ammonia oxidation granular sludge in the granular sludge reactor into nitrogen for removal, allowing the mixed liquor of the granular sludge reactor to enter a rear-end sedimentation tank for sludge-water separation, wherein the ammonia nitrogen concentration of effluent is 10mg/L, the nitrate nitrogen is 35mg/L, the nitrate nitrogen does not contain nitrite nitrogen, the TN of effluent is 45mg/L, the TN removal rate is 93.6%, and the effluent is directly discharged after reaching the standard. The sludge in the sedimentation tank flows back to the head end of the integrated biofilm reactor, and the sludge return flow of the sedimentation tank is 4000m 3 /d。
The granular sludge reactor in the coupled denitrification system is debugged and started, inoculated sludge is directly injected into the granular sludge reactor through the sludge inoculation port, after the system is started after 3 months of operation, the system has the condition of inoculation as seed sludge, anaerobic ammonia oxidation granular sludge is discharged from the sludge inoculation port, and the granular sludge reactor can provide inoculated granular sludge about 60m every 3 months 3 。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A coupled denitrification system comprising an integrated biofilm reactor (2); the integrated bio-membrane reactor (2) is provided with a reactor water inlet (21) and a reactor water outlet (25), and is characterized in that the reactor water inlet (21) or the reactor water outlet (25) is communicated with the granular sludge reactor (1);
the granular sludge reactor (1) comprises a granular sludge reactor body (11);
the inner cavity of the granular sludge reactor body (11) is sequentially provided with a water distributor (12), a sludge inoculation port (15), a gas separator (13) and an inclined plate (14) from bottom to top;
a water weir groove (18) is arranged at the outer top of the granular sludge reactor body (11); the water weir trough (18) is positioned above the inclined plate (14) in the vertical direction;
the granular sludge reactor (1) is communicated with a reactor water inlet (21) of the integrated biological membrane reactor (2) through a water weir groove (18); or:
the integrated biofilm reactor (2) is communicated with a water distributor (12) of the granular sludge reactor (1) through a reactor water outlet (25).
2. The coupled denitrification system according to claim 1, wherein the granular sludge reactor body (11) is a cylinder; the height of the granular sludge reactor body (11) is 10-20 m.
3. The coupled denitrification system according to claim 1, wherein the inner cavity of the granular sludge reactor body (11) is further provided with an agitator (16); in the vertical direction, the stirrer (16) is positioned between the water distributor (12) and the gas separator (13).
4. The coupled denitrification system according to claim 1, wherein the granular sludge reactor (1) further comprises a return pipe (17); the return pipe (17) is positioned outside the granular sludge reactor body (11), and one end of the return pipe (17) is communicated with the water distributor (12); in the vertical direction, the other end of the return pipe (17) is located 0.5-1 m below the gas separator (13).
5. The coupled denitrification system according to claim 4, wherein the return pipe (17) is provided with a return pump (19) on its piping.
6. The coupled denitrification system according to claim 1, wherein the integrated biofilm reactor (2) further comprises an integrated biofilm reactor body (20); the integrated bio-membrane reactor comprises an integrated bio-membrane reactor body (20), wherein a filler (24) is filled in an inner cavity of the integrated bio-membrane reactor body (20), an aerator (23) positioned at the bottom of the filler (24), a blower (22) communicated with the aerator (23) and positioned on the outer side of the integrated bio-membrane reactor body (20), and a sludge inlet (26) positioned at the bottom of the integrated bio-membrane reactor body (20).
7. The coupled denitrification system according to any one of claims 1 to 6, wherein the coupled denitrification system further comprises a regulating tank (3) and a settling tank (4); the sedimentation tank (4) is provided with a sedimentation tank water inlet (41), a sedimentation tank water outlet (42) and a sludge outlet (43);
the regulating tank (3) is communicated with the granular sludge reactor (1) through a water distributor (12);
the integrated biofilm reactor (2) is communicated with a sedimentation tank water inlet (41) of the sedimentation tank (4) through a reactor water outlet (25);
a sludge outlet (43) of the sedimentation tank (4) is respectively communicated with the integrated biofilm reactor (2) and the granular sludge reactor (1);
or:
the regulating tank (3) is communicated with the integrated biofilm reactor (2) through a reactor water inlet (21);
the granular sludge reactor (1) is communicated with a sedimentation tank water inlet (41) of the sedimentation tank (4) through a water weir groove (18);
and a sludge outlet (43) of the sedimentation tank (4) is communicated and reflows to the integrated biofilm reactor (2).
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