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Recycling treatment method for automobile coating wastewater

A technology for coating wastewater and treatment methods, applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc.

Active Publication Date: 2014-04-23
新疆德安环保科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the influent COD of this water quality is 1100mg / L, and the biochemical ratio is 0.37, which is not a typical coating wastewater quality and is easy to treat

Method used

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  • Recycling treatment method for automobile coating wastewater
  • Recycling treatment method for automobile coating wastewater
  • Recycling treatment method for automobile coating wastewater

Examples

Experimental program
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Effect test

Embodiment

[0030] 1) Collect the waste water and waste liquid produced in the workshop in the phosphating pool or high-concentration waste water regulating pool respectively. The influent water quality: pH is 8.07, COD is 4078mg / L, BOD is 986mg / L, and total zinc is 42mg / L, total phosphorus 105mg / L, nickel 36mg / L.

[0031] 2) Phosphating wastewater enters the phosphating wastewater reaction sedimentation tank for intermittent treatment, adding liquid caustic soda to adjust the pH value to 10.2, calcium chloride 800mg / l, chlorosulfuric iron 75mg / L, and anionic polyacrylamide 3mg / L for treatment , After 24 hours of standing still after treatment, the supernatant is discharged into the production wastewater adjustment tank, and the mud is discharged into the phosphating sludge concentration tank.

[0032] 3) A small amount of high-concentration wastewater is added to the production wastewater adjustment pool every day, and the water quality and quantity are adjusted with the treated phospha...

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Abstract

The invention provides a recycling treatment method for automobile coating wastewater. The recycling treatment method comprises the following steps: adjusting wastewater, pre-treating, carrying out microbiological treatment, carrying out cohesion treatment, carrying out fiber filtering, carrying out nano filtering and carrying out sludge floating slag treatment; in a cohesion process, the pH (Potential of Hydrogen) value is controlled to 10.0-10.5 so that hydroxyapatite [Ca5(OH)(PO4)3] and zinc hydroxide sediment are generated by a phosphate radical and zinc ions. The pre-treating step adopts secondary coagulation treatment; solid-liquid separation after a cohesion reaction respectively adopts an inclined tube settler and an air floating tank, namely an inclined plate sedimentation basin is used for removing heavy metal compound sediment with the great specific gravity and the air floating tank is used for removing organic matters with the light specific gravity. The microbiological treatment adopts an HCR which is an efficient jet bioreactor so that the biological reaction efficiency in the reactor is greatly improved. Desalting treatment adopts a nano filtering device with a low operation cost to remove a lot of salts and fine impurities, so that output water can be recycled to afforest and irrigate.

Description

technical field [0001] The invention relates to sewage treatment and reuse technology, and the method is suitable for the treatment and reuse process of automobile waste water, especially suitable for the treatment of automobile painting waste water. Background technique [0002] The painting of automobiles and their parts is one of the links that generate the most wastewater discharge in the automobile manufacturing process. The water quality has the following characteristics: ① There are many types of wastewater and complex components: the wastewater generated in the coating process is mainly divided into degreasing concentrated liquid, spraying wastewater, and electrophoresis concentrated water. Contains emulsified oils, surfactants, phosphates, heavy metal ions (such as Zn 2+ ), fillers (such as titanium dioxide), solvents and other pollutants; ② Irregular discharge: Except for some washing water, which is continuously overflowed and discharged, most of the wastewater o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 马莉达徐志宗
Owner 新疆德安环保科技股份有限公司
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