CN201990576U - A printing and dyeing wastewater treatment system - Google Patents

Abstract

The utility model discloses a dyeing waste water treatment system which comprises a comprehensive waste water pretreatment system, an advanced reuse treatment system and a sludge treatment system, wherein the sludge treatment system comprises a sludge tank; the comprehensive waste water pretreatment system comprises a regulation tank, a coagulation and sedimentation tank, a drain tank, a biological hydrolysis and acidification tank, an aerobic contact oxidation tank, a radial flow-type secondary sedimentation tank and a middle water tank, which are connected in sequence; the advanced reuse treatment system comprises an automatic backwash-type sand filtering system, a pressure-type ultrafiltration membrane system, a reverse osmosis (RO) membrane system and an RO reused water tank; the sludge outlet of the radial flow-type secondary sedimentation tank is communicated with the sludge tank; and the water outlet of the middle water tank is communicated with the automatic backwash-type sand filtering system. According to the utility model, the quality of the advanced reuse water meets the effluent quality standards, the water resources are saved by means of advanced reuse, the chemical oxygen demand (COD) is reduced every year, and the ammonia nitrogen discharge can meet the standards.

Description

A printing and dyeing wastewater treatment system

technical field

The utility model relates to the technical field of multistage treatment of industrial waste water, in particular to a printing and dyeing waste water treatment system.

Background technique

The printing and dyeing industry is a major user of water and sewage. Printing and dyeing enterprises generally have a sewage treatment system. The existing sewage treatment system mainly adopts physical and chemical pretreatment processes. After the sewage is treated up to the standard, it is directly discharged into the pipe, as shown in Figure 1. Urban sewage treatment pipe network or directly discharged into surface water bodies. However, since the existing system does not carry out biochemical treatment, ammonia nitrogen exceeds the standard, and considering the increasing shortage and serious pollution of water resources, it is necessary to carry out in-depth treatment of printing and dyeing wastewater no matter from the perspective of enterprise cost or social environmental protection. After processing, it is reused in production.

Utility model content

The utility model provides a printing and dyeing wastewater treatment system in order to solve the problems existing in the above-mentioned prior art. After advanced treatment, most of the printing and dyeing wastewater can be recycled to the production workshop, and the rest of the concentrated water can be directly collected according to the local pipe discharge standard. pipe discharge.

The purpose of this utility model is achieved through the following technical solutions:

A printing and dyeing wastewater treatment system, including a comprehensive wastewater pre-treatment system, a deep reuse treatment system and a sludge treatment system, the sludge treatment system includes a sludge pool, and the comprehensive wastewater pre-treatment system includes sequentially connected adjustment pools, Coagulation sedimentation tank, drainage tank, biological hydrolysis acidification tank, aerobic contact oxidation tank, radial flow secondary sedimentation tank and intermediate water tank; the deep reuse treatment system includes automatic backwashing sand filter system connected in sequence, pressurized Ultrafiltration membrane system, RO membrane system (RO reverse osmosis integrated membrane treatment system) and RO reuse water tank; the sludge outlet of the radial flow secondary sedimentation tank is connected to the sludge tank; the outlet of the intermediate tank is connected to the automatic Backwash sand filter system.

A grid well is arranged at the front end of the adjustment pool.

The biological hydrolysis and acidification tank is equipped with a submersible mixing system to prevent sludge deposition.

The biological hydrolysis acidification tank and the aerobic contact oxidation tank are equipped with a waste gas collection and treatment system.

Compared with the prior art, the utility model has the following beneficial effects:

1. Adopt a more targeted (hydrolytic acidification) A/(aerobic contact oxidation) O process to solve the problem of excessive ammonia nitrogen;

2. The water quality requirements for deep reuse, especially the indicators such as chroma and total hardness, meet the water quality standards for effluent;

3. In response to the national call for energy conservation and emission reduction, it has great environmental benefits. The deep reuse treatment system reuses a large amount of water, which can save sewage discharge fees and tap water fees; through deep water reuse, water resources can be saved, and COD emissions can be reduced every year, and Ammonia nitrogen can discharge up to standard;

4. High treatment efficiency, low engineering investment, low operating cost, low floor space, stable operation of the wastewater treatment system, safety and reliability, and flexible operation;

5. Properly handle the sludge generated during the wastewater treatment process to avoid secondary pollution;

6. Take effective prevention and control measures for waste gas and noise pollution generated during wastewater treatment to reduce their impact on the surrounding environment.

Description of drawings

Fig. 1 is the schematic flow sheet of existing wastewater treatment system;

Fig. 2 is a schematic flow chart of an embodiment of the present invention.

Detailed ways

Describe the utility model in detail below in conjunction with accompanying drawing.

As shown in Figure 2, a printing and dyeing wastewater treatment system is divided into three parts, including a comprehensive wastewater pretreatment system, an advanced reuse treatment system and a sludge treatment system.

1. Comprehensive wastewater pre-treatment system

The comprehensive wastewater pre-treatment system first pre-treats through pH adjustment and coagulation sedimentation, and then adopts the secondary biochemical combined treatment process of "hydrolytic acidification and biological contact oxidation" to treat the wastewater to the primary standard (COD≦100mg/L), Finally, the effluent from the secondary sedimentation tank enters the advanced treatment system.

The comprehensive wastewater pretreatment system includes a regulating tank 1, a coagulation sedimentation tank 2, a drainage tank 3, a biological hydrolysis acidification tank 4, an aerobic contact oxidation tank 5, a radial flow secondary sedimentation tank 6 and an intermediate pool 7, which are connected in sequence.

After the comprehensive wastewater is collected, it first enters the regulating pool, and the front end of the pool is provided with a grid well 8 to remove fibers, garbage and other substances. The regulating pool is conducive to uniform water quality and quantity, and ensures the stability of subsequent treatment. After uniform water quality and quantity, the pH of the wastewater is adjusted, and the coagulation reaction is carried out by adding coagulants, flocculants, etc. to remove some organic matter, reduce the load and difficulty of subsequent biochemical treatment, and set up an advection primary sedimentation tank for sedimentation.

The pretreated wastewater is poured into the biological hydrolysis and acidification tank from the drainage tank. The biological hydrolysis and acidification tank is equipped with contact fillers, which are mainly attached to heterotrophic facultative microorganisms to reach the stage of hydrolysis and acidification. A submersible mixing system is also installed to prevent sludge Sedimentation is also conducive to the full contact reaction of wastewater and sludge. Under the action of facultative bacteria, the macromolecule and complex organic matter in the wastewater are degraded into small molecules and simple organic matter, which improves the biodegradability of the wastewater, improves the subsequent aerobic biochemical treatment conditions, and has good decolorization of dyes effect. At the same time, the subsequent aerobic mixed liquid and the sludge of the secondary sedimentation tank are returned to carry out denitrification biological denitrification in a facultative state (dissolved oxygen is less than 0.5mg/L) to reduce the ammonia nitrogen content in the wastewater.

The effluent from hydrolysis and acidification is connected to the aerobic contact oxidation tank, aerated by a blower (dissolved oxygen is about 1-2 mg/L), and the microorganisms (aerobic bacteria) in a suspended state in the tank are used to adsorb organic pollutants in the wastewater , Decomposition, so as to achieve the purpose of removing organic pollutants and purifying water quality. The aerobic pool is equipped with a vortex flowmeter, which can control the air volume according to the frequency conversion, which can save operating costs. The effluent from the aerobic contact oxidation tank flows into the radial flow secondary settling tank for mud-water separation, and the effluent flows to the intermediate pool by itself for deep reuse treatment.

In the process of comprehensive wastewater pre-treatment, pollution such as waste gas and noise will be generated, which will have a great impact on the surrounding environment. Therefore, the prevention and control of waste gas in the sewage treatment system and the prevention and control of noise pollution in the sewage treatment system will be added.

During the operation of the sewage treatment system, due to the metabolism of microorganisms, a certain amount of odorous waste gas will be generated, which will pollute the surrounding atmospheric environment. The collection and treatment system 9 collects and discharges the odorous gas generated in the biochemical system in a centralized manner, so as to reduce the pollution to the surrounding atmospheric environment.

During the operation of the biochemical treatment system, the air blower is required to continuously provide air, which generates large noise pollution and affects the living environment of the surrounding residents. Therefore, soundproof covers are added to the blower, and measures such as soundproof walls and soundproof windows are used for the fan room to reduce the impact of noise .

2. Deep reuse processing system

The wastewater in the middle pool continues to be treated in depth. The deep reuse treatment system adopts the double-membrane treatment technology of automatic cleaning sand filter and "pressurized UF ultrafiltration membrane and reverse osmosis RO integrated membrane" for deep reuse treatment. Recycled water meets the water quality requirements for high-grade reused water. The advanced treatment water is reused to the production workshop, and the rest of the deep membrane separation concentrated water is discharged according to the three-level standard. If the discharge standard is raised, the concentrated water from membrane separation can be treated by additional treatment facilities.

The deep reuse treatment system includes an automatic backwash sand filter system 10, a pressurized ultrafiltration membrane system 11, an RO membrane system (RO reverse osmosis integrated membrane treatment system) 12 and an RO reuse water pool 13 connected in sequence;

The advanced reuse treatment system uses the effluent of the biochemical secondary settling tank as raw water, which is lifted by the intermediate pool into the advanced treatment system through a pump, and the outlet of the intermediate pool is connected to the automatic backwashing sand filter system. In order to ensure the stable operation of the subsequent double-membrane system, an automatic backwash sand filter system is added in the front section to further remove suspended solids, colloids and other substances in the wastewater, and the effluent is then filtered into the pressurized ultrafiltration membrane system to remove the wastewater. bacteria, viruses, organic matter and chroma, etc., improve the water quality of the subsequent RO reverse osmosis integrated membrane treatment system, prolong its service life, and ensure the stability of the overall deep recycling process. The effluent from the ultrafiltration membrane system enters the RO reverse osmosis integrated membrane system. Through the concentration and interception capacity of the RO membrane, the desalination and purification of the effluent water quality can be reused for dyeing and printing water quality requirements. Membrane system dope can be discharged directly through nanotubes if it reaches the third-level nanotube discharge standard. If the discharge standard is raised, the concentrated water from membrane separation can be treated by additional treatment facilities.

3. Sludge treatment system

The sludge treatment system includes a sludge tank 14. The sludge outlet of the radial-flow secondary settling tank is connected to the sludge tank. The sludge generated in the radial-flow secondary settling tank is connected to the sludge tank, and the reduced sludge passes through the mortar pump. It is sent to the belt-type thickening integrated filter press for dehydration treatment, and the treated sludge is transported outside for treatment, and the filtrate is connected to the hydrolysis and acidification tank to avoid secondary pollution.

The above disclosures are only a few specific embodiments of the present application, but the present application is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present application.

Claims (4)

1. A printing and dyeing wastewater treatment system, comprising a comprehensive wastewater pretreatment system, a deep reuse treatment system and a sludge treatment system, the sludge treatment system comprising a sludge pond, characterized in that the comprehensive wastewater pretreatment system comprises A regulating tank, a coagulation sedimentation tank, a drainage tank, a biological hydrolysis acidification tank, an aerobic contact oxidation tank, a radial flow secondary settling tank and an intermediate tank connected in sequence; the deep reuse treatment system includes a sequentially connected automatic backwashing Sand filter system, pressurized ultrafiltration membrane system, RO membrane system and RO reuse water tank; the sludge outlet of the radial flow secondary sedimentation tank is connected to the sludge tank; the outlet of the intermediate tank is connected to the automatic backwashing type Sand filter system. 2. A printing and dyeing wastewater treatment system according to claim 1, characterized in that, a grid well is arranged at the front end of the adjustment pool. 3. A printing and dyeing wastewater treatment system as claimed in claim 1, wherein a submersible mixing and stirring system for preventing sludge deposition is provided in the biological hydrolysis acidification tank. 4. A printing and dyeing wastewater treatment system as claimed in claim 1, characterized in that a waste gas collection and treatment system is arranged on the biological hydrolysis acidification tank and the aerobic contact oxidation tank. the

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