1 project overview: (in case of coating wastewater)

A lot of waste water will be produced in the production process. Generally speaking, coating wastewater with high concentration of pollutants, complex composition, high water content, high pollution. A new sewage treatment station is planned to be built, and the waste water produced in the coating line is treated. In accordance with the requirements of the environmental protection department, the enterprise wastewater treatment to achieve the "integrated wastewater discharge standard" (8978-1996 GB) level A emission standards.

My company according to the basic situation and discharge requirements of the coating waste water, in line with the principle of less investment, low operation cost, high processing efficiency, to your company reported this design, for your company leadership review.

2 treatment of water

According to the relevant data provided by your company.

3 influent water quality

According to the information provided by your company and the same kind of project sewage water quality, the relevant indicators are as follows

Unit: mg/L (except PH)

4 water quality

Design water to achieve the "comprehensive wastewater discharge standard" (8978-1996 GB) level A emission standards, the relevant indicators are as follows:

Unit: mg/L (except PH)

5 principles of Technology

Through the analysis of the water quality of coating wastewater and the discussion of the emission requirements, the design of the method of physical chemistry and biochemical technology is adopted to deal with the waste water.

Wastewater is first entered into the aeration regulating tank, regulating the water quantity, the average and the water quality. The waste water is then raised to the first stage coagulation reaction tank through the lifting pump. Mixed flocculation reaction tank is divided into three spaces: the first frame is added into the wastewater of calcium hydroxide, adjusted to pH 10 to 10.5, the wastewater of zinc, nickel, phosphate transformation become solid precipitates; second on the grid to the wastewater with PAC, destruction of colloidal nuances of suspended particles in the water formed stable system, aggregation of suspended particles; the third lattice to the wastewater in PAM, integrated with significant precipitation properties of floc suspended solids in water clusters. After the treatment, the waste water flows into the inclined tube sedimentation tank, and the solid precipitate and the specific gravity of the wastewater are removed.

Inclined tube sedimentation tank effluent into the two mixed flocculation tank, two mixed flocculation tank is also divided into three grids: the first case will waste water PH callback to 8 ~ 7, in favor of the subsequent biochemical unit and flocculation unit treatment efficiency. Second R PAC, so that the water formed flocs. Third R PAM, and then flow into the solid-liquid separation of dissolved air flotation machine.

Flotation machine water flowing into hydrolytic acidification tank, by hydrolysis and acidification, the wastewater in macromolecular organic matter decomposition into small molecular organic matters, will be difficult to degradation of organic matter transformation for easily degradable organic matter, so as to improve the wastewater can be biochemically. Then the waste water flows into the contact oxidation tank, to the waste water in aeration, through the metabolism of microorganisms will waste water pollution in the decomposition, absorption, so that the waste water purification. Contact oxidation pond effluent into the secondary sedimentation tank sludge water separation, biochemistry waterways lift pump rate through the sand tank, a carbon filter tank of water pollutants further adsorption filtration final effluent could meet the discharging standard.

Sedimentation tank sludge, air flotation scum machines are discharged into sludge tank, then through the plate and frame filter press dewatering drying after the reunification of Sinotrans.

6 wastewater treatment process