阅读说明：本技术 一种聚酯废水的处理方法及其装置 (Polyester wastewater treatment method and device ) 是由 孙芳芳 刘李杰 杨勇 于 2021-08-03 设计创作，主要内容包括：本发明公开一种聚酯废水的处理方法及其装置。本发明直接将市政污泥作为碳源和载体培养复合菌剂,让复合菌剂中的各种菌达到最优化的状态,然后再用这种高活性状态的复合菌去处理废水,与传统的在废水系统外驯化活性污泥相比耗时更短,通过厌氧和好氧的步骤,氮素通过硝化和反硝化过程转化为氮气排出,大分子碳水化合物得到分解,转化为小分子无机碳,废水COD和总氮得到降低。(The invention discloses a method and a device for treating polyester wastewater. The invention directly uses municipal sludge as a carbon source and a carrier to culture the composite microbial inoculum, so that various bacteria in the composite microbial inoculum reach an optimal state, and then uses the composite bacteria in a high-activity state to treat wastewater.)

1. A method for treating polyester wastewater is characterized by comprising the following steps:

step (1), domesticating microorganism composite bacteria and activated sludge;

1-1, preparing the microorganism composite bacteria into a composite microbial inoculum stock solution, activating, and then sequentially activating and culturing the activated stock solution to prepare the composite microbial inoculum active diluent. The compound microbial inoculum active diluent is a mixed solution of compound microbial inoculum stock solution, molasses and water; the composite microbial inoculum stock solution is a mixed solution of a solid microbial composite microbial inoculum, molasses and water;

the solid microbial compound bacteria comprise lactobacillus, prevotella, acetobacter, candida boidinii, veillonella and rhodospirillum;

1-2, in the pre-acclimation stage, adding tap water and the composite microbial inoculum active diluent into an acclimation pool for aeration every day, stirring for 8-10 hours, and then adding a certain amount of municipal sludge for acclimation; after pre-acclimation is finished, adding raw polyester water and the composite microbial inoculum active diluent into an acclimation pool every day for aeration, stirring for 8-10 hours, and then adding municipal sludge for secondary acclimation;

1-3, the supernatant of the domestication tank enters a sedimentation tank in an overflow mode, and the sludge at the bottom of the sedimentation tank is domesticated sludge which can be used as domesticated composite bacteria seeds and is respectively added into an aerobic tank and an anaerobic tank of the wastewater treatment main reaction system.

And (2) adding raw polyester water into a main wastewater treatment reaction system, setting different reaction tanks according to the anaerobic, aerobic and sedimentation principles, and adding domesticated sludge and a composite microbial inoculum active diluent into the aerobic tank and the anaerobic tank.

And (3) detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard.

2. The method for treating polyester wastewater according to claim 1, wherein the solid microbial composite specifically comprises the following components in percentage by mass:

3. the method for treating polyester wastewater according to claim 1, wherein: the mass ratio of the composite microbial inoculum stock solution to the molasses to the water is 1 (0.5-2) to 50; the mass ratio of the solid microbial compound inoculum to the molasses to the water is 1 (2-10) to 100.

4. The method for treating polyester wastewater according to claim 1, wherein: the activation condition of the compound microbial inoculum active diluent is as follows: culturing for 3-5 days under aerobic condition at normal temperature, wherein aeration is needed in the period of 3-5 minutes each time and 2-4 times each day;

the culture conditions of the compound microbial inoculum active diluent are as follows: placing the activated complex microbial inoculum active diluent at the constant temperature of 28-40 ℃ for culturing for 20-48 h.

5. The method for treating polyester wastewater according to claim 1, wherein: the activation condition of the composite microbial inoculum stock solution is as follows: and (3) performing sealed activation culture for 5-10 days under a complete anaerobic condition at normal temperature.

6. The method for treating polyester wastewater according to claim 1, wherein the acclimation tank is kept in a facultative state, and aeration is performed once every 2 to 4 hours for 10 to 30 minutes; the pH, the Dissolved Oxygen (DO) and the oxidation-reduction potential (ORP) in the domestication pond are required to be kept within a certain range, wherein the pH is 6-9, the DO is 1-3, and the ORP is 50-150 mv.

7. The method for treating polyester wastewater according to claim 1, wherein the addition volume ratio of municipal sludge, tap water and composite microbial inoculum active diluent in the pre-acclimation stage is 10:6: 3-1; in the secondary domestication stage, the volume ratio of the added amount of municipal sludge, raw polyester water and the active diluent of the composite microbial inoculum is 10:6: 3-1.

8. The method for treating polyester wastewater according to claim 1, wherein the main reaction system for wastewater treatment comprises an anaerobic tank, an aerobic tank, a sedimentation tank and a water outlet tank which are connected in sequence; and adding a composite microbial inoculum active diluent and domesticated sludge into the anaerobic tank and the aerobic tank.

9. The method for treating polyester wastewater according to claim 1, wherein the volume ratio of the complex microbial inoculum active diluent to the acclimated sludge is 0.35-0.5: 50 to 100.

10. A biochemical treatment device for polyester wastewater is characterized by comprising a wastewater treatment main reaction system, a domestication tank and a sedimentation tank 1;

the domestication pond is provided with a municipal sludge adding port, a tap water adding port, a composite microbial inoculum active diluent adding port and a polyester raw water adding port, the upper end of the domestication pond is provided with an overflow port, and the overflow port is connected with an inlet of the sedimentation pond 1; the lower end of the sedimentation tank 1 is provided with a sludge outlet;

the main reaction system for wastewater treatment comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence; the water outlet of the anaerobic tank is connected with the water inlet of the aerobic tank through a pipeline, the water outlet of the aerobic tank is connected with the water inlet of the sedimentation tank 2 through a pipeline, and the water outlet of the sedimentation tank 2 is connected with the water inlet of the water outlet tank through a pipeline. The anaerobic tank and the aerobic tank are both provided with a composite microbial inoculum active diluent adding port and a sludge adding port; the sludge adding ports of the anaerobic tank and the aerobic tank are connected with the sludge outlet of the sedimentation tank 1 through pipelines.

Technical Field

The invention belongs to the technical field of wastewater treatment, and relates to a method and a device for treating polyester wastewater.

Background

Polyester is an important raw material in the chemical fiber industry, and is a general name of a high molecular compound formed by polycondensation of dihydric alcohol or polyhydric alcohol and dibasic acid or polybasic acid. Polyesters are generally classified into two major groups, saturated polyesters, mainly polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and the like, and unsaturated polyesters, mainly polyester glass reinforced plastics, and the like. The world polyester industry has huge scale, and the discharge amount of the polyester production wastewater in China is quite large, if the polyester production wastewater is directly discharged into a river channel without being treated, the polyester production wastewater can cause serious harm to the receiving water body and the surrounding environment.

The polyester production wastewater refers to various wastewater generated in the polyester production process, and the components of the wastewater mainly comprise unreacted polybasic acid, polyhydric alcohol, micromolecular acid, oligomer and the like. The polyester wastewater is characterized in that: the COD concentration is high, the fluctuation is large, the acidity is more, and the wastewater discharge fluctuation is large. Compared with the chemical method, the biological method has the characteristics of large occupied area, long reaction time, complex process, troublesome operation, special requirements on the quality of inlet water and the like, but the unit treatment cost is far lower than that of the chemical method, and the operation cost is lower. For biological treatment, anaerobic treatment or aerobic treatment is used independently, and the effluent quality is difficult to reach the national first-grade discharge standard or the treatment cost is too high. The anaerobic treatment has economic attraction to the high-concentration polyester production wastewater, can effectively reduce the organic load of the polyester production wastewater, improve the biodegradability and the subsequent aerobic treatment efficiency of the wastewater, and has low sludge yield and low power consumption; the start time of aerobic treatment is short, and the effluent quality is good, so the anaerobic treatment is generally adopted and then the aerobic biological treatment is connected in series, and the process is generally regarded as the most economic and reasonable treatment method at present. Because the COD concentration of waste water is high and the emission is great, adopt traditional biochemical treatment means to be difficult to high-efficient the problem of solving waste water discharge to reach standard, simultaneously, need consider the influence that N, P element is low to the microorganism probably to cause in the waste water to and the problem of handling of hazardous waste.

The invention provides a wastewater treatment method, which combines bacteria domestication and a wastewater treatment system and ensures the effluent quality of the system on the premise of high efficiency and stability.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a polyester wastewater treatment method which is efficient, stable, economical and reasonable and has no adverse effect on the whole wastewater treatment system.

The invention is realized by the following technical scheme:

a treatment method of polyester wastewater comprises the following steps:

step (1), domesticating microorganism composite bacteria and activated sludge;

1-1, preparing the microorganism composite bacteria into a composite microbial inoculum stock solution, activating, and then sequentially activating and culturing the activated stock solution to prepare the composite microbial inoculum active diluent. The compound microbial inoculum active diluent is a mixed solution of compound microbial inoculum stock solution, molasses and water; the composite microbial inoculum stock solution is a mixed solution of a solid microbial composite microbial inoculum, molasses and water;

the solid microbial compound inoculant comprises the following components in percentage by mass:

the other strains are used for assisting main strains (lactobacillus and prevotella) to digest and decompose various organic matters, such as photosynthetic bacteria and nitrobacteria.

Preferably, the mass ratio of the composite microbial inoculum stock solution, the molasses and the water is 1 (0.5-2) to 50;

preferably, the activation conditions of the complex microbial inoculum active diluent are as follows: culturing for 3-5 days under aerobic condition at normal temperature, wherein aeration is needed in the period of 3-5 minutes each time and 2-4 times each day;

preferably, the culture conditions of the complex microbial inoculum active diluent are as follows: placing the activated complex microbial inoculum active diluent at the constant temperature of 28-40 ℃ for culturing for 20-48 h.

Preferably, the mass ratio of the solid microbial compound inoculant to the molasses to the water is 1 (2-10): 100;

preferably, the activation condition of the complex microbial inoculum stock solution is as follows: performing sealed activation culture for 5-10 days under the complete anaerobic condition at normal temperature;

adding tap water and the composite microbial inoculum active diluent into a domestication pool for aeration every 10-14 days before 1-2, stirring for 8-10 hours, then adding a certain amount of municipal sludge for pre-domestication, then keeping adding raw polyester water and the composite microbial inoculum active diluent into the domestication pool for aeration every day after the pre-domestication is finished, stirring for 8-10 hours, and then adding municipal sludge for secondary domestication;

preferably, the acclimatization pond is kept in a facultative state, aeration is carried out once within 2-4 hours, and the aeration time is 10-30 minutes each time; the pH, the Dissolved Oxygen (DO) and the oxidation-reduction potential (ORP) in the domestication pond are required to be kept within a certain range, wherein the pH is 6-9, the DO is 1-3, and the ORP is 50-150 mv.

Preferably, the addition volume ratio of municipal sludge, tap water and the composite microbial inoculum active diluent in the pre-acclimation stage is 10:6: 3-1; in the secondary domestication stage, the volume ratio of the addition amount of the municipal sludge, the raw polyester water and the composite microbial inoculum active diluent is 10:6: 3-1;

the polyester raw water is polyester wastewater discharged from a factory without any treatment.

1-3, the supernatant of the domestication tank enters a sedimentation tank in an overflow mode, and the sludge at the bottom of the sedimentation tank is domesticated sludge which can be used as domesticated composite bacteria seeds and is respectively added into an aerobic tank and an anaerobic tank of the wastewater treatment main reaction system.

And (2) adding raw polyester water into a main wastewater treatment reaction system, setting different reaction tanks according to the anaerobic, aerobic and sedimentation principles, and adding domesticated sludge and a composite microbial inoculum active diluent into the aerobic tank and the anaerobic tank.

Preferably, the main reaction system for wastewater treatment comprises an anaerobic tank, an aerobic tank, a sedimentation tank and a water outlet tank which are connected in sequence; and adding a composite microbial inoculum active diluent and domesticated sludge into the anaerobic tank and the aerobic tank.

Preferably, the volume ratio of the composite microbial inoculum active diluent to the domesticated sludge is 0.35-0.5: 50 to 100.

And (3) detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard.

The invention also aims to provide a biochemical treatment device for polyester wastewater, which comprises a main wastewater treatment reaction system, a domestication tank and a sedimentation tank 1;

the domestication pond is provided with a municipal sludge adding port, a tap water adding port, a composite microbial inoculum active diluent adding port and a polyester raw water adding port, the upper end of the domestication pond is provided with an overflow port, and the overflow port is connected with an inlet of the sedimentation pond 1; the lower end of the sedimentation tank 1 is provided with a sludge outlet;

the main reaction system for wastewater treatment comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence; the water outlet of the anaerobic tank is connected with the water inlet of the aerobic tank through a pipeline, the water outlet of the aerobic tank is connected with the water inlet of the sedimentation tank 2 through a pipeline, and the water outlet of the sedimentation tank 2 is connected with the water inlet of the water outlet tank through a pipeline. The anaerobic tank and the aerobic tank are both provided with a composite microbial inoculum active diluent adding port and a sludge adding port; the sludge adding ports of the anaerobic tank and the aerobic tank are connected with the sludge outlet of the sedimentation tank 1 through pipelines.

By adopting the technical scheme, after the wastewater treatment, the COD at the water outlet end can be reduced to below 500ppm from the original 30000-58000 ppm, the wastewater discharge index is met, the efficiency is high, the stability is high, and no adverse effect is caused on the whole wastewater treatment system.

The invention directly uses municipal sludge as a carbon source and a carrier to culture the composite microbial inoculum, so that various bacteria in the composite microbial inoculum reach an optimal state, and then uses the composite bacteria in a high-activity state to treat wastewater.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, municipal sludge is directly used as a carbon source and a carrier to culture the composite microbial inoculum, and the sludge domestication is placed in a wastewater treatment system, so that the domestication time of the sludge is greatly shortened, and the treatment efficiency of wastewater is greatly improved;

2. the invention adopts the composite microbial inoculum, and the activity and the adaptability of the composite microbial inoculum are greatly enhanced by specific activation culture of the stock solution and the diluent of the composite microbial inoculum, the activity of the composite microbial inoculum is kept at a higher level, and the influence of the external environment is less;

3. the invention introduces a high-concentration activated sludge method, so that various bacteria in the composite microbial inoculum can reach an optimized state, and the specific and efficient treatment of the polyester wastewater can be realized more quickly;

4. the method does not basically produce secondary pollution, has low cost and simple and convenient operation, and has higher comprehensive treatment capacity on the polyester wastewater.

Drawings

FIG. 1 is a schematic view of the structure of a biochemical treatment apparatus for polyester wastewater according to the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples.

FIG. 1 is a biochemical treatment apparatus for polyester wastewater, which comprises a main wastewater treatment reaction system, a domestication tank and a sedimentation tank 1;

the domestication pond is provided with a municipal sludge adding port, a tap water adding port, a composite microbial inoculum active diluent adding port and a polyester raw water adding port, the upper end of the domestication pond is provided with an overflow port, and the overflow port is connected with an inlet of the sedimentation pond 1; the lower end of the sedimentation tank 1 is provided with a sludge outlet;

the main reaction system for wastewater treatment comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence; the water outlet of the anaerobic tank is connected with the water inlet of the aerobic tank through a pipeline, the water outlet of the aerobic tank is connected with the water inlet of the sedimentation tank 2 through a pipeline, and the water outlet of the sedimentation tank 2 is connected with the water inlet of the water outlet tank through a pipeline. The anaerobic tank and the aerobic tank are both provided with a composite microbial inoculum active diluent adding port and a sludge adding port; the sludge adding ports of the anaerobic tank and the aerobic tank are connected with the sludge outlet of the sedimentation tank 1 through pipelines.

The method for treating polyester wastewater based on the device is specifically shown in the following examples.

Example 1:

(1) synthesizing a composite microbial inoculum active diluent;

uniformly mixing 1 part by weight of composite microbial inoculum, 2 parts by weight of molasses and 100 parts by weight of water to prepare a solution a; placing the solution a in an anaerobic environment for sealed culture for 5 days to obtain an activated solution a;

uniformly mixing 1 part by weight of the activated solution a, 1 part by weight of molasses and 50 parts by weight of water to prepare a solution b; placing the solution b in an aerobic environment for culturing for 3 days, aerating for 2-4 times every day, and aerating for 3-5 minutes each time to obtain an activated solution b; placing the activated solution b in an environment of 40 ℃ for constant-temperature culture for 20h to obtain a composite microbial inoculum diluent;

the solid microbial compound inoculant is prepared by mixing the following bacteria in a certain mass percentage;

(2) domestication of composite bacteria and sludge;

adding 6 tons of tap water and 1 ton of the composite microbial inoculum active diluent into a 400-square domestication tank every day, aerating and stirring for 8 hours, and then adding 10 tons of municipal sludge; when the total amount of the municipal sludge, the tap water and the composite microbial inoculum active diluent added into the domestication pond reaches about 200, namely 12 days continuously, 10 tons of municipal sludge, 6 tons of polyester raw water and 1 ton of the composite microbial inoculum active diluent are added into the domestication pond every day. The acclimation pond needs to keep a facultative state, aeration is carried out once every 2 hours, and the aeration time is 10 minutes each time; in the domestication pond, the pH value is 6.0, the DO value is 2.3, and the ORP value is 60 mv.

(3) Polyester wastewater discharged from a factory without any treatment is added into a wastewater treatment main reaction system shown in figure 1, different reaction tanks are arranged according to the anaerobic, aerobic and sedimentation principles, and the main reaction system comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence. The domestication tank is connected with the sedimentation tank to carry out the preliminary treatment of sewage and domesticate the sludge. 75t of acclimated sludge in the sedimentation tank 1 and 0.35t of composite microbial inoculum active diluent are added into the aerobic tank and the anaerobic tank.

(4) And detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard. If the index is not qualified, the reaction is carried out by continuously refluxing.

Example 2:

(1) synthesizing a composite microbial inoculum active diluent;

uniformly mixing 1 part by weight of composite microbial inoculum, 4 parts by weight of molasses and 100 parts by weight of water to prepare a solution a; placing the solution a in an anaerobic environment for sealed culture for 5 days to obtain an activated solution a;

uniformly mixing 1 part by weight of the activated solution a, 1.5 parts by weight of molasses and 50 parts by weight of water to prepare a solution b; placing the solution b in an aerobic environment for culturing for 3 days, aerating for 2-4 times every day, and aerating for 3-5 minutes each time to obtain an activated solution b; placing the activated solution b in an environment of 40 ℃ for constant-temperature culture for 20h to obtain a composite microbial inoculum diluent;

mixing the following bacteria in a mass content ratio to form a solid microbial compound inoculant;

(2) carrying out domestication of the bacteria;

adding 6 tons of tap water and 1 ton of the composite microbial inoculum active diluent into a 400-square domestication tank every day, aerating and stirring for 9 hours, and then adding 10 tons of municipal sludge; when the total amount of the municipal sludge, the tap water and the composite microbial inoculum active diluent added into the domestication pond reaches about 200, namely 12 days continuously, 10 tons of municipal sludge, 6 tons of polyester raw water and 1 ton of the composite microbial inoculum active diluent are added into the domestication pond every day. The acclimation pond needs to keep a facultative state, aeration is carried out once in 3 hours, and the aeration time is 30 minutes each time; in the domestication pond, the pH value is 6.7, the DO value is 0.9, and the ORP value is 100 mv.

(3) Polyester wastewater discharged from a factory without any treatment is added into a wastewater treatment main reaction system shown in figure 1, different reaction tanks are arranged according to the anaerobic, aerobic and sedimentation principles, and the main reaction system comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence. The domestication tank is connected with the sedimentation tank to carry out the preliminary treatment of sewage and domesticate the sludge. 60t of acclimated sludge in the sedimentation tank 1 and 0.4t of composite microbial inoculum active diluent are added into the aerobic tank and the anaerobic tank.

(4) And detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard. If the index is not qualified, the reaction is carried out by continuously refluxing.

Example 3:

(1) synthesizing a composite microbial inoculum active diluent;

uniformly mixing 1 part by weight of composite microbial inoculum, 8 parts by weight of molasses and 100 parts by weight of water to prepare a solution a; placing the solution a in an anaerobic environment for sealed culture for 5 days to obtain an activated solution a;

uniformly mixing 1 part by weight of the activated solution a, 0.5 part by weight of molasses and 50 parts by weight of water to prepare a solution b; placing the solution b in an aerobic environment for culturing for 3 days, aerating for 2-4 times every day, and aerating for 3-5 minutes each time to obtain an activated solution b; placing the activated solution b in an environment of 40 ℃ for constant-temperature culture for 20h to obtain a composite microbial inoculum diluent;

mixing the following bacteria in a mass ratio to form a solid microbial compound inoculant;

(2) domestication of composite bacteria and sludge;

adding 6 tons of tap water and 1 ton of the composite microbial inoculum active diluent into a 400-square domestication tank every day, aerating and stirring for 9 hours, and then adding 10 tons of municipal sludge; when the total amount of the municipal sludge, the tap water and the composite microbial inoculum active diluent added into the domestication pond reaches about 200, namely 12 days continuously, 10 tons of municipal sludge, 6 tons of polyester raw water and 1 ton of composite microbial inoculum active diluent are added into the domestication pond every day. The acclimation pond needs to keep a facultative state, aeration is carried out once in 4 hours, and the aeration time is 30 minutes each time; the pH value in the domestication pond is 6.0, and the DO value in the domestication pond is 2.3, and the ORP value in the domestication pond is 80 mv.

(3) Polyester wastewater discharged from a factory without any treatment is added into a wastewater treatment main reaction system shown in figure 1, different reaction tanks are arranged according to the anaerobic, aerobic and sedimentation principles, and the main reaction system comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence. The domestication tank is connected with the sedimentation tank to carry out the preliminary treatment of sewage and domesticate the sludge. 80t of acclimated sludge in the sedimentation tank 1 and 0.35t of composite microbial inoculum active diluent are added into the aerobic tank and the anaerobic tank.

(4) And detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard. If the index is not qualified, the reaction is carried out by continuously refluxing.

Example 4:

(1) synthesizing a composite microbial inoculum active diluent;

uniformly mixing 1 part by weight of composite microbial inoculum, 7 parts by weight of molasses and 100 parts by weight of water to prepare a solution a; placing the solution a in an anaerobic environment for sealed culture for 5 days to obtain an activated solution a;

uniformly mixing 1 part by weight of the activated solution a, 2 parts by weight of molasses and 50 parts by weight of water to prepare a solution b; placing the solution b in an aerobic environment for culturing for 3 days, aerating for 2-4 times every day, and aerating for 3-5 minutes each time to obtain an activated solution b; placing the activated solution b in an environment of 40 ℃ for constant-temperature culture for 20h to obtain a composite microbial inoculum diluent;

mixing the following bacteria in a mass content ratio to form a solid microbial compound inoculant;

(2) domestication of composite bacteria and sludge;

adding 6 tons of tap water and 1 ton of the composite microbial inoculum active diluent into a 400-square domestication tank every day, aerating and stirring for 10 hours, and then adding 10 tons of municipal sludge; when the total amount of the municipal sludge, the tap water and the composite microbial inoculum active diluent added into the domestication pond reaches about 200, namely 12 days continuously, 10 tons of municipal sludge, 6 tons of polyester raw water and 1 ton of composite microbial inoculum active diluent are added into the domestication pond every day. The acclimation pond needs to keep a facultative state, aeration is carried out once in 3 hours, and the aeration time is 20 minutes each time; the pH value in the domestication pond is 6.0, and the DO value in the domestication pond is 2.6, and the ORP value in the domestication pond is 120 mv.

(3) Polyester wastewater discharged from a factory without any treatment is added into a wastewater treatment main reaction system shown in figure 1, different reaction tanks are arranged according to the anaerobic, aerobic and sedimentation principles, and the main reaction system comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence. The domestication tank is connected with the sedimentation tank to carry out the preliminary treatment of sewage and domesticate the sludge. 100t of acclimated sludge in the sedimentation tank 1 and 0.5t of composite microbial inoculum active diluent are added into the aerobic tank and the anaerobic tank.

(4) And detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard. If the index is not qualified, the reaction is carried out by continuously refluxing.

Comparative example

(1) Synthesizing a composite microbial inoculum active diluent;

uniformly mixing 1 part by weight of composite microbial inoculum, 2 parts by weight of molasses and 100 parts by weight of water to prepare a solution a; placing the solution a in an anaerobic environment for sealed culture for 5 days to obtain an activated solution a;

uniformly mixing 1 part by weight of the activated solution a, 1 part by weight of molasses and 50 parts by weight of water to prepare a solution b; placing the solution b in an aerobic environment for culturing for 3 days, aerating for 2-4 times every day, and aerating for 3-5 minutes each time to obtain an activated solution b; placing the activated solution b in an environment of 40 ℃ for constant-temperature culture for 20h to obtain a composite microbial inoculum diluent;

the solid microbial compound inoculant is prepared by mixing the following bacteria in a certain mass percentage;

(2) the acclimation of the composite bacteria and the sludge is carried out by using a high-concentration activated sludge method, as mentioned in CN 202010738900.1;

a. inoculating sludge (the sludge concentration is 1 g/L);

b. culturing and domesticating:

(i) culturing: 150 parts of sewage with lower concentration (ammonia nitrogen is less than 20mg/L, COD is less than 200mg/L) is added into a domestication pool, aeration is stopped after continuous aeration is carried out for 3 days, supernatant is discharged after static sedimentation is carried out for 2.5 hours, the water inlet aeration drainage step is repeated until the sludge sedimentation ratio (SV) is 20 percent, which indicates that the sludge is mature, and the repeated process needs 20 days;

(ii) domestication: ensuring the stability of the quality of the incoming water, namely adopting a method of gradually increasing the water inlet amount under the condition that the ammonia nitrogen is less than 200mg/L and the COD is less than 800 mg/L. And increasing one-stage water inflow every 7 days, wherein each stage of water inflow is implemented by adopting a time control method, and each stage of water inflow is increased to 25% of the existing water inflow. The water inlet time of the domestication pond is increased from 1 hour per cycle to 2 hours per cycle in four times in one month, so that the microorganisms in the sewage are gradually adapted to the water quality of the inlet water. It takes 3 months to complete from start-up to normal operation (full load water intake).

(3) Polyester wastewater discharged from a factory without any treatment is added into a wastewater treatment main reaction system shown in figure 1, different reaction tanks are arranged according to the anaerobic, aerobic and sedimentation principles, and the main reaction system comprises an anaerobic tank, an aerobic tank, a sedimentation tank 2 and a water outlet tank which are connected in sequence. The domestication pond is connected with the sedimentation pond for domesticating the sludge. And (3) adding the acclimated sludge and the composite microbial inoculum active diluent in the sedimentation tank 1 for 0.35t into the aerobic tank and the anaerobic tank.

(4) And detecting the effluent of the sedimentation tank 2, and discharging after reaching the standard. If the index is not qualified, the reaction is carried out by continuously refluxing.

Detection method

Taking 5 batches of different polyester wastewater, and respectively taking 10L wastewater samples, wherein 2L of each water sample is taken to measure the COD value, and the rest water samples are respectively marked as a water sample A, a water sample B, a water sample C, a water sample D and a water sample E. Then, the water sample a was processed by the procedure described in example 1, the water sample B was processed by the procedure described in example 2, the water sample C was processed by the procedure described in example 3, the water sample D was processed by the procedure described in example 4, the water sample E was processed by the procedure described in comparative example, 5 experiments were performed independently without interference, and the test results were as follows: (COD Unit ppm)

TABLE 1

Water sample		Time required for starting to treat raw water	COD of raw water	COD of effluent
					Water sample A	Example 1	12 days	48410	392
Water sample B	Example 2	12 days	42055	400
					Water sample C	Example 3	12 days	41660	424
Water sample D	Example 4	12 days	35620	479
					Water sample E	Comparative example	3 months old	32735	971

And (4) conclusion: through the test, the COD removal rate of the final effluent water of the water sample A is about 99.19 percent; the removal rate of COD in the final effluent of the water sample B is about 99.05 percent, and the removal rate of COD in the final effluent of the water sample C is about 98.98 percent; the removal rate of the water sample D in the final effluent COD is about 98.66%, the removal rate of the water sample E in the final effluent COD is about 97.03%, and all water samples reach the indirect discharge standard and can be discharged. Compared with the traditional sludge domestication mode, the method can be used for treating raw water on day 12, the required time is shorter, the operation is simpler and more convenient, and the treatment efficiency of the wastewater is greatly improved. In conclusion, the invention has better comprehensive treatment capacity on polyester wastewater.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It will be apparent to those skilled in the art that modifications may be made to the above-described embodiments, or equivalents may be substituted for elements thereof without departing from the spirit of the invention, and any such modifications, equivalents, improvements or additions are intended to be included within the scope of the invention.

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above embodiments, and all embodiments are within the scope of the present invention as long as the requirements of the present invention are met.