Treatment system and treatment method for wastewater during production of waterborne furniture paint

Abstract

The invention relates to a treatment system and a treatment method for wastewater during production of waterborne furniture paint. The treatment system comprises a dosing pond, a coagulation pond, a precipitating pond, a hydrolytic acidification pond, a biological contact oxidation pond and the like, wherein the wastewater is introduced in the coagulation pond, a coagulant in the dosing pond is pumped into the coagulation pond, and the wastewater in the coagulation pond enters the precipitating pond; a sludge discharging pipe is arranged at the bottom part of the precipitating pond; a precipitating pond water outlet is formed in the upper part of the precipitating pond; a sludge discharging pipe for discharging coagulated and precipitated sludge is formed in the bottom part of the coagulation pond; effluent of the precipitating pond enters the hydrolytic acidification pond; a gas collection hole is formed in the top part of the hydrolytic acidification pond; CO2 and methane generated in the hydrolytic acidification pond escape from the gas collection hole, so that gas-liquid separation is realized; the effluent of the hydrolytic acidification pond enters the biological contact oxidation pond; a water outlet is formed in the bottom part of the biological contact oxidation pond; filler in the biological contact oxidation pond is immersed by the wastewater in the biological contact oxidation pond. The treatment system disclosed by the invention is capable of increasing the removal efficiency of organic matters in the wastewater and is simple in operation.

Description

technical field [0001] The invention relates to a wastewater treatment system and a treatment method, in particular to a wastewater treatment system and a treatment method in the production of water-based furniture paint, and belongs to the innovative technology of the wastewater treatment system and treatment method in the production of water-based furniture paint. Background technique [0002] A few days ago, the Ministry of Environmental Protection reviewed and approved the "13th Five-Year" Volatile Organic Compounds Pollution Prevention and Control Work Plan. Prior to this, Guangdong, Beijing, Tianjin, Zhejiang and other provinces and cities have successively issued policies on VOCs. With the implementation of VOCs governance policies across the country, the coatings industry has ushered in a storm of "oil to water". Water-based coatings use water instead of organic solvents, which can greatly reduce environmental pollution. However, some waste water, sewage, waste liqu...

AI Technical Summary

Problems solved by technology

However, some waste water, sewage, waste liquid, waste residue and other substances produced in the production process do not pollute the water source less than oil-based paint. If the post-treatment is not proper, the environmental pollution is still serious.

In addition, there are a lot of equipment to be cleaned in the production of water-based coatings, such as paint tanks, filters and filter media, storage tanks, storage tanks, etc., which are frequently and complicated to clean. Therefore, a large amount of wastewater will be generated in the production process of water-based coatings manufacturers

Due to the dispersion of water-based paint in water, large foam and incomplete demulsification are often encountered in the process of treating wastewater containing water-based paint

At the same time, the components of this type of wastewater are relatively complex, generally synthetic resin compounds with complex structures and large molecular weights and soluble organic solvents. This type of organic wastewater is difficult to meet the discharge standards after being treated by traditional biological oxidation methods. Once the wastewater Discharged into the environment, because the organic matter in the wastewater is difficult to be decomposed and has long-term persistence, it will remain in environmental media such as water and soil for a long time

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