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Polishing wastewater treatment method and polishing wastewater treatment system

A treatment method and wastewater technology, applied in the field of polishing wastewater treatment and polishing wastewater treatment system, can solve the problems of low efficiency of polishing wastewater treatment

Active Publication Date: 2017-02-15
WGTECH JIANGXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a polishing wastewater treatment method and a polishing wastewater treatment system for the problem of low polishing wastewater treatment efficiency

Method used

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  • Polishing wastewater treatment method and polishing wastewater treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1 ton of polishing waste water is processed, containing cerium dioxide and sodium salt suspending agent sodium hexametaphosphate and sodium polyacrylate in the polishing waste water, adding 10g of sodium hydroxide in the polishing waste water to adjust the pH value of the polishing waste water to be 8.0, After the water quality is uniform, add 250g of polyaluminum chloride and 5g of polyacrylamide to the polishing waste water; then carry out precipitation treatment on the polishing waste water after adding sodium hydroxide and flocculant for 2h.

[0068] The gravimetric method was used to detect the content of ceria in the supernatant of the polishing waste liquid and the precipitation treatment. After testing, the removal rate of ceria in the supernatant reaches 85%.

Embodiment 2

[0070] 1 ton of polishing waste water is processed, containing cerium dioxide and sodium salt suspending agent sodium hexametaphosphate and sodium polyacrylate in the polishing waste water, adding 11g of sodium hydroxide to the polishing waste water to adjust the pH value of the polishing waste water to be 8.5, It is recorded as the intermediate liquid. After the water quality is uniform, 240g of polyaluminum chloride and 6g of polyacrylamide are added to the polishing wastewater; then the polishing wastewater added with sodium hydroxide and flocculant is subjected to precipitation treatment for 0.5h. The precipitated sludge is introduced into a filter press for pressure filtration treatment, the filter residue intercepted by the filter press is collected, and the cerium oxide in the filter residue is recovered. The filtrate obtained by filtration is mixed with the intermediate liquid and processed again.

[0071] The gravimetric method was used to detect the content of ceria ...

Embodiment 3

[0073] 1 ton of polishing waste water is treated. The polishing waste water contains cerium dioxide and sodium salt suspending agent sodium hexametaphosphate and sodium polyacrylate. Adding 12g of sodium hydroxide to the polishing waste water to adjust the pH of the polishing waste water is 9.0 to obtain intermediate liquid. After the water quality is uniform, add 260g of polyaluminum chloride and 4g of polyacrylamide to the polishing wastewater; then pass the polishing wastewater with sodium hydroxide and flocculant into it for precipitation treatment for 2h. The precipitated sludge is introduced into a vacuum filter for filtration treatment, the filter residue is collected, and the cerium oxide in the filter residue is recovered. The filtrate passing through the vacuum filter is mixed with the intermediate liquid for further processing.

[0074] The gravimetric method was used to detect the content of ceria in the supernatant of the polishing waste liquid and the precipitat...

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Abstract

The invention relates to a polishing wastewater treatment method. Polishing wastewater contains cerium dioxide and a sodium salt suspending agent. The polishing wastewater treatment method comprises following steps: strong base is added to the polishing wastewater to damage a suspension characteristic of the polishing wastewater, and an intermediate liquid is obtained; a flocculating agent is added to the intermediate liquid for flocculation treatment, a reaction liquid is obtained, and the flocculating agent contains polyaluminum chloride and polyacrylamide; the reaction liquid is subjected to sedimentation treatment. The strong base is added to the polishing wastewater and can react with the suspending agent in the polishing wastewater to damage the suspension characteristic of the suspending agent, or the suspending agent is dissolved in an alkaline environment to result in failure of the suspending agent in the polishing wastewater, meanwhile, the viscous state of the polishing wastewater is damaged, the polishing wastewater becomes prone to sedimentation, then the commonly used flocculating agent is added, and by means of the scheme, the sedimentation rate is greatly increased.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a polishing wastewater treatment method and a polishing wastewater treatment system. Background technique [0002] The glass thinning industry will use polishing powder to polish the chemically etched glass. The main component of the polishing powder is ceria. When used, the polishing powder is prepared into a solution of a certain concentration. In order to avoid the precipitation of the polishing powder during use and affect the quality of the polishing product, the polishing powder manufacturer will add a certain amount of suspending agent to the polishing powder during the production process. However, adding a suspending agent also increases the difficulty of treating the polishing waste liquid. [0003] At present, the method commonly used in the industry is natural precipitation. Due to the large amount of polishing wastewater and the addition of suspending agent, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/001C02F1/5236C02F1/56C02F1/66C02F9/00C02F2001/007C02F2103/12
Inventor 易伟华张迅皮帅李远洋
Owner WGTECH JIANGXI
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