CN100469718C - Device and method for treating refractory wastewater by hydrolysis-composite membrane biology - Google Patents

Abstract

A device and method for treating refractory wastewater by hydrolysis-composite membrane biology relates to a device and method for treating refractory wastewater by hydrolysis-composite membrane biology. The device includes a multi-chamber hydrolysis reactor (1), a composite membrane bioreactor (2), the treatment method is: anoxic hydrolysis: the wastewater to be treated enters the multi-compartment hydrolysis reactor (1) through the water inlet pipe (1-8), and the wastewater is hydrolyzed under anoxic conditions, and the reaction process Control in the hydrolysis stage; aerobic degradation/membrane separation: the wastewater treated by anaerobic hydrolysis in the multi-compartment hydrolysis reactor (1) enters the contact oxidation zone (2-1) of the composite membrane bioreactor (2) for aerobic biological treatment, the wastewater treated in the contact oxidation zone (2-1) enters the membrane separation zone (2-2) of the composite membrane bioreactor (2) for further aerobic biological treatment, and the multi-compartment hydrolysis reactor (1 ) and a part of the precipitated sludge in the composite membrane bioreactor (2) flow back to the diversion area (1-1) of the multi-compartment hydrolysis reactor (1).

Description

Device and method for treating refractory wastewater by hydrolysis-composite membrane biology

technical field

The invention relates to a device and method for treating refractory wastewater by a hydrolysis-composite membrane biological method, and belongs to the technical field of organic sewage (waste) water treatment.

Background technique

For the refractory industrial wastewater with a large volume and wide area, it is difficult to meet the discharge standard by using a single aerobic biological method or anaerobic biological method, and the operating cost is too high if the physical and chemical method is used. The method of using anoxic hydrolysis to pretreat refractory wastewater followed by aerobic biological treatment has been gradually recognized. Anoxic hydrolysis pretreatment has a short hydraulic retention time, a high conversion rate of refractory organic matter, and can greatly improve the biodegradability of wastewater. The organic matter converted by hydrolysis can be efficiently degraded in the subsequent aerobic stage. The joint treatment of refractory wastewater by anoxic hydrolysis process and aerobic process has been confirmed by a large number of researches and practical projects. However, in practical applications, there are still problems such as the residence time cannot be guaranteed, short flow and channel flow occur, wastewater and sludge cannot be fully mixed and contacted, and the treatment effect cannot be guaranteed. In the traditional biological treatment process, the separation effect of mud and water in the secondary sedimentation tank is not good, and the concentration of suspended solids in the effluent is high, which is prone to sludge bulking. In order to effectively solve these problems, membrane biotechnology has been developed rapidly. The invention organically integrates and combines the two, and proposes a hydrolysis-composite membrane biological wastewater treatment method and device.

Contents of the invention

Technical problem: The object of the present invention is to provide a device and method for treating refractory wastewater by hydrolysis-composite membrane biological method, which organically combines hydrolysis and composite membrane biological method to overcome the poor biodegradability of refractory wastewater existing in the existing process , The residence time cannot be guaranteed, short flow and channel flow are prone to occur, wastewater and sludge cannot be fully mixed and contacted, and the mud-water separation effect is not good. By using the method of the invention, the treated waste water can be discharged up to the standard and meet the requirements of resource utilization.

Technical solution: The device for treating refractory wastewater by the hydrolysis-composite membrane biological method of the present invention includes a multi-chamber hydrolysis reactor and a composite membrane bioreactor, wherein the outlet end of the multi-chamber hydrolysis reactor is connected to the composite membrane bioreactor through a connecting pipe. The water inlets of the reactors are connected, and a membrane module is placed in the composite membrane bioreactor, and the membrane module is connected with the membrane separation outlet pipe; Return the mixed solution of the composite membrane bioreactor to the water inlet pipe of the multi-compartment hydrolysis reactor; the compressed air pipe is connected to the aeration pipe at the lower part of the composite membrane bioreactor, at the outlet of the sludge collection area at the bottom of the composite membrane bioreactor Connect to the inlet end of the switch valve, one outlet end of the switch valve is connected to the remaining sludge pipe, the other outlet end of the switch valve and the outlet of the second control valve at the bottom of the multi-chamber hydrolysis reactor are respectively connected to the inlet end of the second reflux pump. The outlet of the secondary reflux pump is connected to the diversion area in the multi-compartment hydrolysis reactor.

The multi-compartment hydrolysis reactor is composed of 3 to 7 hydrolysis reaction chambers connected in series. The upper part of each hydrolysis reaction chamber is open, and the bottom of each hydrolysis reaction chamber is equipped with a mud discharge pipe. The last of the hydrolysis reaction chamber The first level is the sedimentation area, and a rectification area is set on the upper part of the sedimentation area. The zones are connected at the lower part of the hydrolysis reaction chamber, and a deflector at an angle of 30 to 60° to the vertical line is arranged at the lower end of the partition, and the deflector zone in the first-stage hydrolysis reaction chamber is connected with the water inlet pipe.

The composite membrane bioreactor includes a contact oxidation zone and a membrane separation zone connected at the lower part, and the sludge collection zone is located at the lower part of the membrane separation zone; hanging or suspended fillers are arranged in the contact oxidation zone, and membrane modules are placed in the membrane separation zone , the lower part of the contact oxidation zone and the membrane separation zone is equipped with an aeration pipe, and the slope i of the bottom plate of the composite membrane bioreactor is 1:100-2:100.

The method for treating refractory wastewater by hydrolysis-composite membrane biological method of the present invention comprises the following steps:

1.) Anoxic hydrolysis: the wastewater to be treated enters the multi-compartment hydrolysis reactor through the water inlet pipe, and the wastewater is hydrolyzed under anoxic conditions, and the reaction process is controlled in the hydrolysis stage;

2.) Aerobic degradation/membrane separation: The wastewater treated by the anoxic hydrolysis of the multi-chamber hydrolysis reactor enters the contact oxidation zone of the composite membrane bioreactor for aerobic biological treatment, and the suspension or suspension type is set in the contact oxidation zone Filler, the active organisms are attached to the filler in the membrane bioreactor, aeration and oxygen supply are carried out through the aeration tube at the bottom of the membrane bioreactor, and the wastewater is subjected to biological oxidation treatment in this area; the wastewater treated in the contact oxidation zone , enter the membrane separation zone of the composite membrane bioreactor for further aerobic biological treatment, and separate the mud and water through the membrane modules set in the membrane separation zone; the membrane modules trap the refractory macromolecular organic matter and activated sludge in the reactor , increase the sludge concentration in the reactor, reduce the concentration of organic matter in the effluent, and complete the separation of mud and water; return part of the mud-water mixture in the composite membrane bioreactor to the diversion area in the multi-chamber hydrolysis reactor; A part of the precipitated sludge in the chamber hydrolysis reactor and the composite membrane bioreactor flows back to the diversion area of the multi-chamber hydrolysis reactor.

In the anoxic hydrolysis step, the pH value of the wastewater is adjusted to 6.5-9.0, the hydrolysis temperature is 5-32°C, the oxidation-reduction potential is controlled between -100mV-50mV, and the hydraulic retention time is 6-8h. In the aerobic degradation/membrane separation step, the gas-water ratio is 20-30:1, and the residence time is 8-12 hours.

In the prior art, aerobic degradation is generally carried out in a separate reactor. After the waste water is aerobically degraded, it is then subjected to traditional mud-water separation or membrane separation in a secondary settling tank. The invention combines aerobic degradation and separation in a composite membrane bioreactor. The composite membrane bioreactor of the present invention is divided into a contact oxidation zone (filler zone), a membrane separation zone and a sludge zone, wherein, the growth mode of microorganisms has suspension growth and attachment growth, and constitutes a system composed of bacteria, fungi, algae, protozoa A complex ecosystem composed of multiple trophic levels such as metazoans and metazoans. Compared with the traditional biochemical treatment reactor, in the composite membrane bioreactor, a variety of different activity capabilities, respiration types, The nutrient type microbial system improves the processing capacity and stability of the reactor. At the same time, due to the existence of membrane separation, the microorganisms in the system are trapped here, and the nitrifying and denitrifying bacteria with a long generation time stay here to form simultaneous nitrification and denitrification. Consequently, the biofacies exposed to the oxidized zone become more abundant. For the membrane separation zone, due to the existence of the contact oxidation zone, some microorganisms can be immobilized and grown, which can play a role in slowing down membrane fouling.

In the aerobic degradation/membrane separation step, the wastewater treated by anoxic hydrolysis is subjected to aerobic biological treatment under the action of activated sludge to achieve efficient degradation. After aerobic degradation of waste water, the membrane module is used to separate the mud and water, and the refractory macromolecular organic matter and activated sludge are trapped in the reactor, which greatly increases the sludge concentration in the reactor and reduces the organic matter in the effluent. concentration.

In order to further effectively implement the method of the present invention, part of the mud-water mixture in the composite membrane bioreactor can be regularly returned to the anoxic hydrolysis section, and denitrification and denitrification are carried out in the anoxic hydrolysis step; the anoxic hydrolysis reactor can also be Part of the sedimented sludge from the composite membrane bioreactor is returned to the anoxic hydrolysis section, so that the anoxic hydrolysis reaction can always maintain a high sludge concentration and reduce the discharge of excess sludge.

The deflector can make the water evenly distributed and ensure full mixing with the sludge. Since the reaction is controlled in the hydrolysis stage in the hydrolysis reactor, no gas is generated, and the setting of the deflector can keep the water flow in a turbulent flow state in the flow diversion area, and maintain a laminar flow state in the reaction area. Therefore, in the hydrolysis reactor, the water flow is generally in the push flow state, and the cells are also in the push flow state, and there will be no short flow and channel flow, thus ensuring the contact and mixing of wastewater and sludge; and, in each hydrolysis In the reaction chamber, the wastewater flows forward in the diversion area and the reaction area to ensure sufficient residence time for the hydrolysis reaction. The refractory wastewater can be fully degraded and become a degradable or easily degradable intermediate product, which greatly improves the waste water. biochemical.

Further, diversion slopes can be provided at the bottom of each cell, and the angle of the slopes is 50-60°. The setting of the diversion slope can not only play the role of diversion, but also reduce the dead volume of the reactor.

The wastewater treated by the multi-chamber hydrolysis reactor first enters the contact oxidation zone of the composite membrane bioreactor. Hanging or suspended fillers are set in the contact oxidation zone, and active organisms are attached to the fillers in the membrane bioreactor, and the aeration tube at the bottom of the reactor is used for aeration and oxygen supply, and the waste water is oxidized and degraded in this zone. The wastewater after aerobic treatment enters the membrane separation area of the composite membrane bioreactor. Sludge-water separation is carried out through the membrane module installed in the membrane separation area. The membrane module can trap the refractory macromolecular organic matter and activated sludge in the reactor, which increases the sludge concentration in the reactor and reduces the organic matter in the effluent. concentration. It effectively overcomes the shortcomings of poor mud-water separation in the secondary sedimentation tank, high concentration of suspended solids in the effluent, and prone to sludge bulking in the traditional biological treatment process. The bottom of the reactor is a sludge collecting area, and the bottom slope i=1:100～2:100.

The composite membrane bioreactor is divided into a biological contact oxidation zone, a membrane separation zone and a sludge collection zone, with clear functions, uniform and reasonable water flow distribution, and the treatment efficiency of the reactor is ensured.

Beneficial effects: According to the wastewater treatment method and device of the present invention, the organic combination and integration of hydrolysis and composite membrane biological method can effectively treat refractory wastewater.

(1) The combination of hydrolysis and composite membrane biological method, the wastewater undergoes hydrolysis and aerobic degradation process. The refractory organic matter is partially decomposed to become degradable or easily degradable intermediate products, which greatly improves its biodegradability; the aerobic degradation process plays an efficient degradation role. After the refractory wastewater is treated by the method of the invention, it can meet the requirements of standard discharge and resource utilization.

(2) The membrane separation step can effectively separate mud and water, reduce the concentration of organic matter in the effluent, and maintain the sludge concentration in the reactor; the improvement of mud-water separation efficiency is conducive to the recycling of sludge and reduces the discharge of excess sludge.

(3) The cell form of the multi-compartment hydrolysis reactor is similar to that of the upflow sludge bed, but the reaction process is only controlled in the hydrolysis stage, and no gas is generated. Therefore, the flow state of the cell is different from the upflow anaerobic sludge bed and anaerobic baffle reactor, and the overall flow state is plug flow. The compartments are also push flow, thus ensuring the contact and mixing of wastewater and sludge to ensure the treatment effect.

(4) The composite membrane bioreactor is divided into a biological contact oxidation zone, a membrane separation zone and a sludge collection zone. The functions are clear, and the water distribution is uniform and reasonable to ensure the treatment efficiency of the reactor.

(5) The growth mode of microorganisms includes not only suspension growth, but also attachment growth. There are different microbial environments at different stages of the treatment process, realizing the diversity of biological phases.

The inventor used the method of the present invention to carry out a hydrolysis-composite membrane biological method treatment test on printing and dyeing wastewater. The results showed that the printing and dyeing wastewater with influent COD _cr of 600mg/L-1400mg/L and chroma of 150-400 times, after hydrolysis - After composite membrane biological treatment, the COD _cr of the effluent is below 100mg/L, and the chroma is below 10 times, all of which have reached the Class I standard (COD _cr ≤100mg/L, chromaticity ≤40 times). The COD _cr removal rate of this process is about 90%. Among them, the COD _cr removal rate of the multi-chamber hydrolysis reactor is 50%-65%. The COD _cr removal rate of the aerobic composite membrane bioreactor reaches about 80%. Chromaticity removal rate is above 96%.

Description of drawings

Fig. 1 is the process flow chart of the inventive method.

Fig. 2 is a schematic diagram of the process device of the present invention.

Fig. 3 is a structural schematic diagram of a multi-chamber hydrolysis reactor.

Fig. 4 is a structural schematic diagram of a composite membrane bioreactor.

The above figure includes: multi-chamber hydrolysis reactor 1, diversion area 1-1, reaction area 1-2, sedimentation area 1-3, rectification area 1-4, deflector plate 1-5, and sludge discharge Pipe 1-6, connecting pipe 1-7, hydrolysis reactor inlet pipe 1-8, hydrolysis reaction chamber 1-9, partition 1-91; composite membrane bioreactor 2, contact oxidation zone 2-1, membrane separation zone 2-2, mud collection area 2-3, packing 2-4, membrane module 2-5, aeration pipe 2-6, bottom plate 2-7, bioreactor water inlet 2-8, slope i; membrane separation water pipe B. First control valve 3-1, second control valve 3-2, first return pump 4-1, second return pump 4-2, mixed liquid return pipe 6, compressed air pipe A, switching valve 5, remaining Sludge pipe7.

Fig. 5 is a schematic diagram of COD _cr changes over time when printing and dyeing wastewater is treated.

Fig. 6 is a schematic diagram of the change of COD _cr removal rate over time in the treatment of printing and dyeing wastewater.

Detailed ways

The device for treating refractory wastewater by hydrolysis-composite membrane biological method of the present invention comprises a multi-compartment hydrolysis reactor 1 and a composite membrane bioreactor 2, wherein the outlet end of the multi-compartment hydrolysis reactor 1 connects with the connecting pipe 1-7 The water inlets 2-8 of the composite membrane bioreactor 2 are connected, and the membrane module in the composite membrane bioreactor 2 is connected with a membrane separation outlet pipe B. In the composite membrane bioreactor 2, through the first control valve 3 -1. The first reflux pump 4-1 and the mixed liquid reflux pipe 6 are connected to the water inlet pipe 1-8 of the multi-compartment hydrolysis reactor 1; the compressed air pipe A and the aeration pipe 2 in the lower part of the composite membrane bioreactor 2- 6-phase connection, the outlet of the mud collection area 2-3 at the bottom of the composite membrane bioreactor 2 is connected to the inlet of the switching valve 5, one outlet of the switching valve 5 is connected to the remaining sludge pipe 7, and the other outlet of the switching valve 5 is connected to the multi- The outlet of the second control valve 3-2 at the bottom of the cell hydrolysis reactor 1 is respectively connected to the inlet end of the second reflux pump 4-2, and the outlet end of the second reflux pump 4-2 is connected to the diversion in the multi-cell hydrolysis reactor 1 District 1-1. The multi-compartment hydrolysis reactor 1 is composed of 3 to 7 hydrolysis reaction chambers 1-9 connected in series. Mud emptying pipe 1-6, the last stage of hydrolysis reaction chamber 1-9 is sedimentation area 1-3, and rectification area 1-4 is arranged on the upper part of sedimentation area 1-3, and the outlet of rectification area 1-4 is connected with The pipes 1-7 are connected; a partition 1-91 is set in the hydrolysis reaction chamber 1-9, and each hydrolysis reaction chamber 1-9 is divided into a diversion area 1-1 and a reaction area 1-2, and the two areas The lower part of the hydrolysis reaction chamber 1-9 communicates, and the lower end of the dividing plate 1-91 is provided with a deflector 1-5 that is 30 to 60° from the vertical line, and the flow guide in the first-stage hydrolysis reaction chamber 1-9 Zone 1-1 is connected to water inlet pipe 1-8. The composite membrane bioreactor 2 includes a contact oxidation zone 2-1 and a membrane separation zone 2-2 connected to the lower part, and the sludge collection zone 2-3 is located at the bottom of the membrane separation zone 2-2; the contact oxidation zone 2-1 Hanging or suspended packing 2-4 is installed inside, membrane module 2-5 is placed in membrane separation zone 2-2, aeration tube 2-6 is installed in the lower part of contact oxidation zone 2-1 and membrane separation zone 2-2, The slope i of the bottom plate 2-7 of the composite membrane bioreactor 2 is 1:100-2:100.

In this embodiment, the method and device of the present invention are used to treat printing and dyeing wastewater. The influent COD _cr of printing and dyeing wastewater to be treated is 600mg/L-1400mg/L, and the chroma is 150-400 times.

The process flow is shown in Figure 1, including anoxic hydrolysis, aerobic degradation/membrane separation steps. Using the device of the present invention, the device is shown in Figure 2, wherein the anoxic hydrolysis step is carried out in the hydrolysis reactor 1, and the aerobic degradation/membrane separation step is carried out in the composite membrane bioreactor 2.

The pH value of the waste water is adjusted to 6.5-9.0, and the gravity flow from the stabilized water tank enters the multi-compartment hydrolysis reactor 1 for hydrolysis pretreatment; the water temperature is 5-32° C., and the residence time is 6-8 hours. The residence time of the composite membrane bioreactor is 8~12h, the influent organic load is 2.08kgCOD _cr /(m ³ ·d)~3.60kgCOD _cr /(m ³ ·d), the sludge concentration is 3~7g/L, and the gas The water ratio is 20-30:1.

Figure 3 is a structural diagram of the multi-compartment hydrolysis reactor 1. The hydrolysis reactor in the test is composed of 5 interconnected compartments, and the compartments are separated by baffles. The bottom of each compartment is equipped with a mud discharge pipe, and the last compartment is a sedimentation chamber. , the remaining chambers are hydrolysis reaction chambers, each hydrolysis reaction chamber is divided into a diversion area 1-1 and a biochemical reaction area 1-2, and the biochemical reaction area 1-2 is equipped with cultivated and acclimated activated sludge. The waste water flows forward in push flow state in each hydrolysis reaction chamber, and hydrolysis reaction occurs in the biochemical reaction zone 1-2. After the hydrolysis reaction, it enters the precipitation zone 1-3 for precipitation treatment, and enters the composite membrane bioreactor 2 through the gravity flow of the rectification zone 1-4. Deflectors 1-5 with α=45° are arranged at the bottom of the multi-chamber hydrolysis reactor, and mud discharge pipes 1-6 are arranged at the bottom of each chamber.

The wastewater after hydrolysis pretreatment is subjected to biological aerobic degradation and membrane separation in composite membrane bioreactor 2 . The composite membrane bioreactor 2 is divided into three parts: a contact oxidation zone 2-1, a membrane separation zone 2-2 and a sludge collection zone 2-3, and its structure is shown in FIG. 4 . The waste water is first degraded through the contact oxidation zone 2-1 equipped with fillers 2-4, and then membrane separated through the membrane module 2-5 in the membrane separation zone 2-2. The aeration is provided by an air pump, measured by a gas flow meter, and supplied with aeration and oxygen by the aeration pipes 2-6 at the bottom of the membrane bioreactor 2 . The sludge enters the sludge collection area 2-3 through the bottom plate 2-7 with a bottom slope of 1:100.

The sedimented sludge from multi-compartment hydrolysis reactor 1 and composite membrane bioreactor 2 is returned to the pool head of multi-compartment hydrolysis reactor 1 by the sludge return pump, which is beneficial to sludge digestion and makes the treatment process have sufficient sludge balance capacity, the excess sludge is discharged from the system through the excess sludge pipe 7.

The method can carry out denitrification treatment at the same time, the wastewater enters the multi-chamber hydrolysis reactor 1, and under anoxic conditions, the organic nitrogen in the wastewater undergoes ammonification under the action of ammonifying bacteria to generate ammonia nitrogen; the multi-chamber hydrolysis reactor 1 The effluent enters the membrane bioreactor 2, and under the action of nitrifying bacteria, the ammonia nitrogen is converted into nitrate nitrogen and nitrite nitrogen; part of the mixed liquid in the composite membrane bioreactor 2 is returned by the pump to the multi-chamber hydrolysis reactor 1 At the head of the pool or other cells in the front section, denitrification is completed under anoxic conditions to achieve the purpose of denitrification; in addition, the organisms are attached to the fillers 2-4 in the membrane bioreactor 2, and the nitrogen in the wastewater is deposited on the biofilm Under the action of simultaneous nitrification and denitrification denitrification, so as to achieve the purpose of denitrification.

The printing and dyeing wastewater was treated with the above method and device, and the results were as follows after running for 150 days:

The change of COD _cr of printing and dyeing wastewater treated by hydrolysis-composite membrane biological method is shown in Figure 5. The test is divided into two stages, and the influent COD _cr is 1000mg/L～1400mg/L and 600mg/L～800mg/L respectively. In the two-stage test, the effluent COD _cr of multi-compartment hydrolysis reactor 1 was 300mg/L-700mg/L and 200mg/L-400mg/L; the effluent COD _cr of membrane modules 2-5 in composite membrane bioreactor 2 were all in Below 100mg/L, reaching the Class I emission standard of the textile dyeing and finishing industry. The supernatant COD _cr of the composite membrane bioreactor 2 is 100mg/L-300mg/L higher than the membrane effluent COD _cr , which shows that the interception effect of the membrane is remarkable.

The temporal change of COD _cr removal rate of wastewater is shown in Fig. 6. It can be seen that the hydrolysis-composite membrane biological treatment process operates stably, and the removal rate has been maintained at about 90%. Within 100 days, the COD _cr removal rate of multi-compartment hydrolysis reactor 1 was about 50%. With the extension of the operation course, the COD _cr removal rate increased to about 65%. The COD _cr removal rate of composite membrane bioreactor 2 reaches 80%.

It has been determined that the chromaticity removal rate of the hydrolysis-composite membrane biological treatment process is above 96%, among which, the chromaticity removal rate of the multi-cell hydrolysis reactor reaches more than 90%. It can be seen that the chromaticity removal is mainly in the multi-cell hydrolysis section.

In summary, the effluent COD _cr of the printing and dyeing wastewater treated by hydrolysis-composite membrane biology is below 100mg/L, which can stably meet the Class I discharge standard of the textile dyeing and finishing industry, and can be partially utilized as resources.

Claims (6)

1. A device for hydrolysis-composite membrane biological method for treating refractory wastewater, characterized in that the device comprises a multi-compartment hydrolysis reactor (1) and a composite membrane bioreactor (2), wherein the multi-compartment hydrolysis reactor The water outlet of (1) is connected with the water inlet (2-8) of the composite membrane bioreactor (2) through the connecting pipe (1-7), and the membrane module (2- 5), the membrane module (2-5) is connected with the membrane separation outlet pipe (B), and the composite membrane bioreactor (2) passes through the first control valve (3-1), the first return pump (4-1) , the water inlet pipe (1-8) that is connected to the multi-compartment hydrolysis reactor (1) by the mixed solution return pipe (6); the aeration pipe ( 2-6) are connected to each other, the outlet of the mud collection area (2-3) at the bottom of the composite membrane bioreactor (2) is connected to the inlet port of the switching valve (5), and an outlet port of the switching valve (5) is connected to the remaining sludge The pipe (7), the other outlet of the switching valve (5) and the outlet of the second control valve (3-2) at the bottom of the multi-chamber hydrolysis reactor (1) are respectively connected to the inlet of the second reflux pump (4-2) , the outlet of the second reflux pump (4-2) is connected to the diversion area (1-1) in the multi-compartment hydrolysis reactor (1). 2. The device for treating refractory wastewater by hydrolysis-composite membrane biological method according to claim 1, characterized in that the multi-compartment hydrolysis reactor (1) consists of 3 to 7 hydrolysis reaction chambers (1-9) connected in series Composition, the upper part of each hydrolysis reaction chamber (1-9) is open type, the bottom of each hydrolysis reaction chamber (1-9) is provided with mud discharge empty pipe (1-6), hydrolysis reaction chamber (1-9 ) is the settling area (1-3), and a rectifying area (1-4) is arranged on the upper part of the settling area (1-3), and the rectifying area (1-4) is connected with the connecting pipe (1-7) Through; divider (1-91) is set in hydrolysis reaction chamber (1-9), each hydrolysis reaction chamber (1-9) is divided into a diversion zone (1-1) and a reaction zone (1-2 ), the two districts are communicated at the bottom of the hydrolysis reaction chamber (1-9), the lower end of the partition (1-91) is provided with a deflector (1-5) which is 30-60° with the vertical line, the first The diversion area (1-1) in the first-stage hydrolysis reaction chamber (1-9) is connected with the water inlet pipe (1-8). 3. The device for treating refractory wastewater by hydrolysis-composite membrane biological method according to claim 1, characterized in that said composite membrane bioreactor (2) comprises a contact oxidation zone (2-1) connected to the lower part, Membrane separation zone (2-2), sludge collection zone (2-3) is located in the lower part of membrane separation zone (2-2); suspension or suspension filler (2-4) is set in contact oxidation zone (2-1) , the membrane module (2-5) is placed in the membrane separation area (2-2), the contact oxidation area (2-1), the lower part of the membrane separation area (2-2) is equipped with an aeration tube (2-6), and the composite The slope (i) of the bottom plate (2-7) of the membrane bioreactor (2) is 1:100-2:100. 4. a hydrolysis-composite membrane biological method as claimed in claim 1 is characterized in that the method comprises the following steps: 1.) Anoxic hydrolysis: the wastewater to be treated enters the multi-compartment hydrolysis reactor (1) through the water inlet pipe (1-8), and the wastewater is hydrolyzed under anoxic conditions, and the reaction process is controlled in the hydrolysis stage; 2.) Aerobic degradation/membrane separation: the wastewater treated by anaerobic hydrolysis in the multi-compartment hydrolysis reactor (1) enters the contact oxidation zone (2-1) of the composite membrane bioreactor (2) for aerobic biological treatment, Suspended or suspended packing (2-4) is set in the contact oxidation zone (2-1), and active organisms are attached to the packing in the membrane bioreactor, and pass through the aeration pipe (2-4) at the bottom of the membrane bioreactor. 6) Aeration and oxygen supply are carried out, and the wastewater is subjected to biological oxidation treatment in this zone; the wastewater treated in the contact oxidation zone (2-1) enters the membrane separation zone (2-2) of the composite membrane bioreactor (2) Further carry out aerobic biological treatment, through the membrane module (2-5) set in the membrane separation zone (2-2) to separate mud and water; the membrane module retains the refractory macromolecular organic matter, activated sludge, etc. in the reactor, Increase the sludge concentration in the reactor, reduce the concentration of organic matter in the effluent, and complete the separation of mud and water; return part of the mud-water mixture in the composite membrane bioreactor (2) to the diversion area in the multi-chamber hydrolysis reactor (1) (1-1); Return a part of sedimentation sludge in the multi-compartment hydrolysis reactor (1) and the composite membrane bioreactor (2) to the diversion area (1-1) of the multi-compartment hydrolysis reactor (1) . 5. The hydrolysis-composite membrane biological method for treating refractory wastewater according to claim 4, characterized in that: in the anoxic hydrolysis step, the pH value of the wastewater is adjusted to 6.5-9.0, and the hydrolysis temperature is 5-32 ℃, the redox potential is controlled between -100mV and 50mV, and the hydraulic retention time is 6 to 8h. 6. The hydrolysis-composite membrane biological method for treating refractory wastewater according to claim 4, characterized in that: in the aerobic degradation/membrane separation step, the gas-water ratio is 20-30:1, and the residence time 8 to 12 hours.

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