CN213327182U

CN213327182U - Biochemical desorption system of high enriched salt water COD

Info

Publication number: CN213327182U
Application number: CN202021145906.XU
Authority: CN
Inventors: 王岱; 巢志理; 田磊
Original assignee: Shaanxi Research Design Institute of Petroleum and Chemical Industry
Current assignee: Shaanxi Chemical Research Institute Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-06-01
Anticipated expiration: 2030-06-19

Abstract

A biochemical removal system of COD of high concentration salt water, the buffer water tank of the chemical pool links with water inlet of intake pump of the biochemical pool, the water outlet of intake pump of the biochemical pool links with water inlet of the biochemical pool, the membrane filters the systematic submergence in the biochemical pool, the water outlet of the membrane filters the systematic water inlet linking with water pump of membrane filtration, the membrane filters the systematic water pump to link with top producing the water tank; the bottom of the water production tank is connected with an inlet of a backwashing water pump of the membrane filtration system through a pipeline; the inlet of the backwashing water pump of the membrane filtration system is connected with the water production pipeline of the membrane filtration system through a pipeline; the outlet of the aeration fan is connected with the inlet of an aeration buffer, and the air outlet of the aeration buffer is connected with a membrane filtration system and an aeration head arranged at the bottom of the biochemical tank; the activated carbon particles loaded with biochemical flora are uniformly mixed in the biochemical pool under the action of aeration, COD in the water is adsorbed by the activated carbon and is biochemically decomposed by the biochemical flora, and the process control target of the high-concentration brine chromaticity and the COD can be economically realized.

Description

Biochemical desorption system of high enriched salt water COD

Technical Field

The utility model belongs to the technical field of industrial wastewater treatment, concretely relates to biochemical desorption system of high enriched salt solution COD.

Background

The components of pollutants in the coal chemical industry wastewater are complex, the biochemical degradability is poor, the wastewater is deeply treated by membrane separation technologies such as reverse osmosis and the like after biochemical treatment, the salt and refractory organic matters in the produced concentrated water are separated and enriched while high-quality reuse water is obtained, and the treatment difficulty of the produced high-concentration brine is higher. Generally, the salt content is more than 10000mg/L, the effective degradation of organic pollutants is difficult to realize by single biochemical treatment, and the COD process control target is difficult to achieve. With the tightening of environmental protection policies, how to realize zero emission (salt content of 30000-60000 mg/L and COD of 200-500 mg/L) of high-salt and high-COD refractory wastewater, especially COD removal treatment becomes an industrial problem, and common treatment methods for the wastewater comprise high-salt biochemical treatment (strengthening strains, adding fillers and the like), advanced oxidation (ozone catalytic oxidation and the like), activated carbon adsorption, electrochemical technology and the like.

In practical engineering application, the problems of unreasonable investment, operation and management exist when the above technologies are singly utilized, and particularly, the process indexes cannot reach the standard. According to engineering experience, when the TDS of the high-concentration brine is 40000-50000 mg/L or so, the COD value of the brine cannot exceed 150mg/L in principle, otherwise, the final product salt cannot meet the quality requirement of the first-class product. Especially when the salt resource utilization rate needs to reach more than 90 percent, the COD value needs to be strictly controlled. The treatment effect of combining one or more technologies of the processes is often greatly superior to that of single technology utilization, and the method is an effective means for solving the problem that the current process indexes reach the standard.

Disclosure of Invention

In order to overcome above-mentioned prior art's not enough, the utility model aims at providing a biochemical desorption system of high enriched salt solution COD, specific salt-tolerant combination fungus crowd, activated carbon adsorption and membrane filter system combination take off COD process systems to the activated carbon is the carrier when guaranteeing COD adsorption rate, has improved biochemical reaction's substrate concentration, thereby improves biochemical reaction rate, and more economic realization high enriched salt solution colourity and COD reach the process control target.

In order to realize the purpose, the utility model discloses a technical scheme is:

a high-concentration salt water COD biochemical removal system comprises a biochemical pond water inlet buffer water tank, wherein the biochemical pond buffer water tank is connected with a water inlet of a biochemical pond water inlet pump, a water outlet of the biochemical pond water inlet pump is connected with a water inlet of the biochemical pond, a membrane filtration system is immersed in the biochemical pond, a water outlet of the membrane filtration system is connected with a water inlet of a membrane filtration system water production pump, and the membrane filtration system water production pump is connected with the top of a water production tank; the bottom of the water production tank is connected with an inlet of a backwashing water pump of the membrane filtration system through a pipeline; the inlet of the backwashing water pump of the membrane filtration system is connected with the water production pipeline of the membrane filtration system through a pipeline; the outlet of the aeration fan is connected with the inlet of the aeration buffer, and the air outlet of the aeration buffer is connected with the membrane filtration system and the aeration head arranged at the bottom of the biochemical tank.

The biochemical pool is filled with 200-300 mu m granular activated carbon serving as a carrier of added strains, the filling volume ratio of the activated carbon is 10-15%, and the hydraulic retention time of the biochemical pool is 24 hours.

The aeration buffer adopts a diaphragm type microporous aerator with phi of 200.

The membrane filtration system has the filtration precision of less than 1 mu m and the water pumping quantity of less than 150L/h, and comprises but is not limited to ultrafiltration.

The utility model has the advantages that:

1. when the method is applied to zero discharge of high-salinity wastewater, the chromaticity of the final effluent can be ensured to be less than 10 times, the COD (chemical oxygen demand) is less than 100mg/L, and the sodium chloride and the sodium sulfate which are subsequently evaporated and crystallized can reach the standard of a first-grade product under the condition of the effluent quality.

2. The special flora is combined with the activated carbon carrier, and the removal rate of COD (chemical oxygen demand) of the high-salt biochemical wastewater reaches more than 50 percent.

3. The produced water is filtered by the immersed ultrafiltration, SS in the produced water is less than 1mg/L, most strains are filtered, the strain density of the biochemical pool is ensured, and the pollution to a subsequent treatment unit is reduced.

4. The service life of the active carbon can reach one year after the biochemical action of the biochemical flora.

Drawings

Fig. 1 is a schematic diagram of the system structure of the present invention.

Wherein, 1 is biochemical pond water inlet buffer tank, 2 is biochemical pond intake pump, 3 is biochemical pond, 4 is membrane filtration system, 5 is membrane filtration system product water pump, 6 is membrane filtration system backwash water pump, 7 is aeration fan, 8 is aeration buffer, 9 is the aeration head, 10 is the product water tank.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, a high concentration salt water COD biochemical removal system comprises a biochemical pool water inlet buffer water tank 1, and is characterized in that the biochemical pool buffer water tank 1 is connected with a water inlet of a biochemical pool water inlet pump 2, a water outlet of the biochemical pool water inlet pump 2 is connected with a water inlet of a biochemical pool 3, a membrane filtration system 4 is immersed in the biochemical pool 3, a water outlet of the membrane filtration system 4 is connected with a water inlet of a membrane filtration system water production pump 5, and the membrane filtration system water production pump 5 is connected with the top of a water production tank 10; the bottom of the water production tank 10 is connected with an inlet of a membrane filtration system backwashing water pump 6 through a pipeline; an inlet of a backwashing water pump 6 of the membrane filtration system is connected with a water production pipeline of the membrane filtration system 4 through a pipeline; the outlet of the aeration fan 7 is connected with the inlet of an aeration buffer 8, and the outlet of the aeration buffer 8 is connected with the membrane filtration system 4 and an aeration head 9 arranged at the bottom of the biochemical pool 3.

The biochemical pool 3 is filled with 200-300 mu m granular activated carbon which is used as a carrier of added strains, the filling volume ratio of the activated carbon is 10-15%, and the hydraulic retention time of the biochemical pool is 24 h.

The aeration buffer 8 adopts a diaphragm type microporous aerator with phi 200.

The membrane filtration system 4 has the filtration precision of less than 1 mu m and the water pumping quantity of less than 150L/h, and comprises but is not limited to ultrafiltration.

The utility model discloses a theory of operation is:

after entering the buffer water tank 1 of the biochemical pool, the incoming water enters the biochemical pool 3 through the feed pump 2 of the biochemical pool. The aeration fan 7 generates high-pressure gas which is divided into two paths by the aeration buffer 8, one path of the high-pressure gas enters the aeration head 9 to provide oxygen for biochemical reaction, and the other path of the high-pressure gas enters the membrane filtration system 4 to enable the membrane filaments to shake to prevent pollution. The incoming water and the active carbon particles loaded with biochemical flora are uniformly mixed in the biochemical pool 3 under the action of aeration, and COD in the water is absorbed by the active carbon. The adsorption of the activated carbon to COD improves the substrate concentration of biochemical reaction, enhances the biochemical reaction rate, and the COD adsorbed on the activity is quickly decomposed by biochemical bacteria. The water filtered by the membrane filtration system 4 is pumped to the water production tank 10 by the membrane filtration system water production pump 5, and the SS in the water production can be reduced to be less than 0.1 mg/L. After running for a period of time, the membrane system needs to be backwashed by using the produced water in the water production tank 10 through the backwashing water pump 6. Through the active carbon adsorption, the biochemical bacteria decomposition and the filtration of a membrane filtration system, the removal rate of COD in the produced water can reach more than 50 percent.

1. The COD absorbed by the activated carbon is decomposed, the regeneration of the activated carbon is completed, and the service life of the activated carbon is prolonged

2. Biochemically and filtering in a pool, forming system internal circulation by aeration quantity difference, canceling a conveying pump and an active carbon carrier reflux pump which are conveyed to a sedimentation tank, preventing carrier loss and removing the pool capacity of a filtering pool;

3. because the biochemical system separates the biochemical retention time from the hydraulic retention time, the COD of the produced water is only related to the COD adsorption speed of the carrier. The hydraulic retention time can be shortened to 4-6 hours by increasing the amount of the activated carbon;

4. as the biochemical bacteria and the COD are both attached to the active carbon, the capsule is retained in the biochemical pool, and the biochemical time is unrelated to the hydraulic retention time, thus being capable of realizing full biochemistry; and the fine carbon particles are more favorable for the attachment and the biochemistry of biochemical bacteria, the biochemical efficiency is improved, the free COD content in water is reduced, and the COD of produced water can be reduced to below 50 ppm or even 30 ppm.

Examples

A coal chemical industry enterprise generates strong brine of 100m through reverse osmosis concentration³The water quality of the inlet water of the high-salinity wastewater COD-removing treatment system is shown in the table 1, and the treatment capacity of the system is 0.05m³/h，L×H×W 1200×1200×650mm3=0.936m³And the filling amount of the activated carbon is 15 percent.

After entering the biochemical tank, the reverse osmosis concentrated water is subjected to biochemical treatment for 20 hours and is filtered out by immersion type ultrafiltration.

After an external air source enters the aeration buffer, air is supplied to the aeration head and the immersed ultrafiltration respectively, so that the suspension state of the activated carbon in the biochemical tank is ensured, and the dissolved oxygen in water is 2-4 mg/L.

The activated carbon is 200-300 mu m granular coal activated carbon, and the iodine value is 1000.

The final water production index after treatment is as required in table 2 below.

The above description is only an example of the implementation steps of the present invention, and it should be noted that, for those skilled in the art, various modifications and changes can be made without departing from the technical principle of the present invention, and these modifications and changes should be considered as the protection scope of the present invention.

Claims

1. A high-concentration salt water COD biochemical removal system comprises a biochemical pond water inlet buffer water tank (1) and is characterized in that the biochemical pond water inlet buffer water tank (1) is connected with a water inlet of a biochemical pond water inlet pump (2), a water outlet of the biochemical pond water inlet pump (2) is connected with a water inlet of a biochemical pond (3), a membrane filtration system (4) is immersed in the biochemical pond (3), a water outlet of the membrane filtration system (4) is connected with a water inlet of a membrane filtration system water production pump (5), and the membrane filtration system water production pump (5) is connected with the top of a water production tank (10); the bottom of the water production tank (10) is connected with an inlet of a backwashing water pump (6) of the membrane filtration system through a pipeline; an inlet of a backwashing water pump (6) of the membrane filtration system is connected with a water production pipeline of the membrane filtration system (4) through a pipeline; the outlet of the aeration fan (7) is connected with the inlet of an aeration buffer (8), and the air outlet of the aeration buffer (8) is connected with the membrane filtration system (4) and an aeration head (9) arranged at the bottom of the biochemical tank (3).

2. The biochemical removal system for COD in high concentration brine according to claim 1, wherein the biochemical pool (3) is filled with 200-300 μm granular activated carbon as a carrier of added strains, the filling volume ratio of the activated carbon is 10-15%, and the hydraulic retention time of the biochemical pool is 24 h.

3. The biochemical removal system for high concentration brine COD according to claim 1, characterized in that the aeration buffer (8) is membrane micro-porous aerator, phi 200.

4. The biochemical removal system for COD in high concentration brine according to claim 1, wherein the membrane filtration system (4) has a filtration precision of < 1 μm and a pumping capacity of < 150L/h, including but not limited to ultrafiltration.