CN204848550U - Industrial waste water treatment system - Google Patents

Abstract

The utility model provides an industrial wastewater treatment system, which comprises a regulating tank, a mixing tank, a coagulation sedimentation tank, a primary intermediate pool, a ceramic ultrafiltration membrane assembly, a secondary intermediate pool, a reverse osmosis membrane assembly, and a product water tank connected in sequence. ; The coagulation sedimentation tank is respectively provided with a PAC dosing device, a PAM dosing device and a sludge tank; the sludge tank is also connected with a plate and frame filter press; one end of the ceramic ultrafiltration membrane assembly is provided with an ultra Membrane cleaning device, the other end is provided with a concentrated water storage tank, a three-effect evaporator and a dehydrator in sequence; one end of the reverse osmosis membrane module is provided with a reverse osmosis membrane cleaning device, and the other end is sequentially provided with a concentrated water storage tank, a three-effect Evaporators and dehydrators. The treatment system of the utility model can not only remove pollutants such as fluorine ions, nitrogen, phosphorus, and suspended solids in wastewater, but also realize zero discharge of nitrogen and phosphorus in the effluent, no concentrated water discharge, simple process flow, and convenient operation.

Description

An industrial wastewater treatment system

technical field

The invention relates to an industrial waste water treatment system, in particular to a polysilicon production waste water treatment system.

Background technique

At present, polysilicon is the key basic material for manufacturing integrated circuits and photovoltaic solar cells, and is an important cornerstone for the development of the country's information industry and photovoltaic new energy industry. However, during the production process, polysilicon production enterprises produce a large amount of complex industrial wastewater containing fluorine, nitrogen, and phosphorus. If it cannot be treated well, it will seriously pollute the water body and endanger the environment. With the implementation of the new Environmental Protection Law and the Taihu Lake Basin Management Regulations, especially in the Taihu Lake Basin in southern my country, zero discharge of nitrogen and phosphorus after treatment of production wastewater is required. Therefore, how to treat production wastewater to achieve zero discharge of nitrogen and phosphorus has become a major issue that must be solved for environmental governance of polysilicon production enterprises.

At present, the wastewater treatment methods of polysilicon production enterprises generally adopt simple adjustment, neutralization, mixing, flocculation sedimentation, filtration and other processes, which cannot achieve zero discharge of nitrogen and phosphorus in wastewater, and if ordinary ultrafiltration membrane filtration is used, sand is required. Filtration, carbon filtration and other pretreatment processes, the process is long and the operation is complicated. Membrane filtration has the problem of concentrated water, and direct discharge will pollute the environment.

Utility model content

In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides an industrial wastewater treatment system, which can not only remove fluoride ions, nitrogen, phosphorus, suspended solids and other pollutants in the wastewater, but also realize zero discharge of nitrogen and phosphorus in the effluent, without Concentrated water discharge, simple process flow, convenient operation, long service life of membrane, no secondary pollution.

The purpose of this utility model is to realize by following scheme:

An industrial wastewater treatment system, comprising a regulating tank, a mixing tank, a coagulation sedimentation tank, a primary intermediate pool, a ceramic ultrafiltration membrane module, a secondary intermediate pool, a reverse osmosis membrane module, and a product water tank connected in sequence; the coagulation A PAC dosing device, a PAM dosing device and a sludge tank are respectively arranged on the sedimentation tank; the sludge tank is also connected with a plate and frame filter press; one end of the ceramic ultrafiltration membrane assembly is provided with an ultrafiltration membrane cleaning device, The other end is provided with a concentrated water storage tank, a three-effect evaporator and a dehydrator in sequence; one end of the reverse osmosis membrane module is provided with a reverse osmosis membrane cleaning device, and the other end is provided with a concentrated water storage tank, a three-effect evaporator and a dehydrator in sequence .

Preferably, a sludge tank lift pump is arranged between the coagulation sedimentation tank and the sludge tank.

Preferably, a sludge pump is provided between the sludge tank and the plate-and-frame filter press.

Preferably, a concentrated water lift pump is arranged between the concentrated water storage tank and the three-effect evaporator.

Preferably, a reverse osmosis membrane booster pump is arranged between the secondary intermediate water tank and the reverse osmosis membrane module.

Preferably, the mixing tank is provided with a dosing device capable of adjusting the pH value.

Preferably, an ultrafiltration membrane booster pump is arranged between the first-stage intermediate water tank and the ceramic ultrafiltration membrane module.

Preferably, the ceramic ultrafiltration membrane module and the reverse osmosis membrane module share a concentrated water storage tank, a three-effect evaporator and a dehydrator.

The beneficial effects of the utility model:

1. The system of this utility model can not only remove pollutants such as fluoride ions and suspended solids in wastewater, but also remove nitrogen and phosphorus in wastewater, and realize zero discharge of nitrogen and phosphorus in the effluent;

2. The utility model adopts the ceramic membrane module, the technological process is simple, and the pretreatment units such as sand filter and carbon filter before the ultrafiltration membrane are omitted, which reduces the lifting of water, saves investment and power consumption;

3. The ceramic membrane module has stronger anti-pollution, anti-acid and alkali capabilities, and longer service life of the membrane;

4. The ceramic membrane module has stronger impact resistance and mechanical shear resistance, and is not easy to scale;

5. Three-effect evaporator is used to treat the concentrated water to realize zero discharge of concentrated water and no secondary pollution.

Description of drawings

Fig. 1 is the structural block diagram of the utility model system;

1. Regulating tank; 2. Mixing tank; 3. Dosing device; 4. Coagulation sedimentation tank; 5. PAC dosing device; 6. PAM dosing device; 7. Sludge tank lift pump; 8. Sludge tank ; 9. Sludge pump; 10. Plate and frame filter press; 11. First-level intermediate pool; 12. Ceramic ultrafiltration membrane module; 13. Ultrafiltration membrane booster pump; 14. Ultrafiltration membrane cleaning device; 15. Two 16. Reverse osmosis membrane booster pump; 17. Reverse osmosis membrane module; 18. Reverse osmosis membrane cleaning device; 19. Product water tank; 20. Concentrated water storage tank; 21. Concentrated water lift pump; 22. Three Efficient evaporator; 23. Dehydrator.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is explained in detail.

Referring to the accompanying drawings, the production wastewater first enters the regulating tank 1, the influent water quality is adjusted, and then enters the mixing tank 2, and the acid or alkali is added through the dosing device 3 to adjust the PH value of the wastewater and perform a mixed reaction for the subsequent Sequential flocculation and sedimentation create favorable conditions.

Then the waste water enters the coagulation sedimentation tank 4, PAC (polyaluminum chloride) is added through the PAC dosing device 5, and PAM (polyacrylamide) is added by the PAM dosing device 6, so that the waste water passes through the compressed electric double layer and the adsorption electrode. And, adsorption bridging, sedimentation and net capture, etc., quickly form dense alum flowers and larger flocs, and under the action of centrifugal force, the dense alum flowers and larger floc particles are precipitated to remove the waste water A large amount of suspended solids, fluoride ions and phosphate ions, etc., and the supernatant after precipitation enter the first-level intermediate pool 11 . The sludge produced in the coagulation sedimentation tank 4 is lifted to the sludge tank 8 through the sludge lifting pump 7, and then lifted to the plate and frame filter press 10 through the sludge pump 9 for sludge dehydration, and the filtrate after the sludge dehydration is returned to It is reprocessed in the regulating tank, and the dehydrated mud cake is transported outside for harmless treatment.

The ceramic ultrafiltration membrane module 12 is connected to the ultrafiltration membrane booster pump 13, and the water is lifted from the primary intermediate pool 11 to the ceramic ultrafiltration membrane module 12 for filtration to remove suspended solids and other pollutants, and the effluent enters the secondary intermediate pool 15. The reverse osmosis membrane booster pump 16 is connected to the reverse osmosis membrane module 17, and the water in the secondary intermediate pool 15 is lifted to the reverse osmosis membrane module 17 for filtration treatment to remove various inorganic salt pollutants such as nitrogen and phosphorus in the water .

The ceramic ultrafiltration membrane module 12 is connected with a ceramic ultrafiltration membrane cleaning device 14, and the reverse osmosis membrane module 17 is connected with a reverse osmosis membrane cleaning device 18, which can perform automatic online cleaning and Chemical cleaning reduces membrane fouling and clogging and prolongs membrane life.

Ceramic ultrafiltration membrane module 12 and reverse osmosis membrane module 17 filter the concentrated water produced in the wastewater and discharge it into the concentrated water storage tank 20. The concentrated water is lifted directly to the three-effect evaporator 22 through the concentrated water lift pump 21 for evaporation and separation of brine. The supersaturated magma is processed by the centrifugal dehydrator 23, and the crystalline solid is transported outside for treatment after dehydration, and finally realizes zero discharge of nitrogen and phosphorus in concentrated water and wastewater.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (8)

1. A kind of industrial wastewater treatment system, it is characterized in that, comprises the regulating pond, mixing pond, coagulation sedimentation pond, one-level intermediate pond, ceramic ultrafiltration membrane assembly, two-stage intermediate pond, reverse osmosis membrane assembly, product water tank; the coagulation sedimentation tank is respectively provided with a PAC dosing device, a PAM dosing device and a sludge tank; the sludge tank is also connected with a plate and frame filter press; one end of the ceramic ultrafiltration membrane assembly is provided with Ultrafiltration membrane cleaning device, the other end is provided with a concentrated water storage tank, a three-effect evaporator and a dehydrator in sequence; one end of the reverse osmosis membrane module is provided with a reverse osmosis membrane cleaning device, and the other end is sequentially provided with a concentrated water storage tank, three Evaporator and dehydrator. 2. The industrial wastewater treatment system according to claim 1, characterized in that a sludge tank lift pump is arranged between the coagulation sedimentation tank and the sludge tank. 3. The industrial wastewater treatment system according to claim 1, wherein a sludge pump is arranged between the sludge tank and the plate-and-frame filter press. 4. The industrial wastewater treatment system according to claim 1, wherein a concentrated water lift pump is arranged between the concentrated water storage tank and the three-effect evaporator. 5. The industrial wastewater treatment system according to claim 1, wherein a reverse osmosis membrane booster pump is arranged between the secondary intermediate pool and the reverse osmosis membrane module. 6. The industrial wastewater treatment system according to claim 1, characterized in that, the mixing tank is provided with a dosing device capable of adjusting the pH value. 7. The industrial wastewater treatment system according to claim 1, characterized in that an ultrafiltration membrane booster pump is arranged between the first-stage intermediate pool and the ceramic ultrafiltration membrane assembly. 8. The industrial wastewater treatment system according to claim 1, wherein the ceramic ultrafiltration membrane module and the reverse osmosis membrane module share a concentrated water storage tank, a three-effect evaporator and a dehydrator.