Treatment process for polycrystalline silicon cutting mortar recovered wastewater

A technology for processing and cutting waste sand, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of reducing pollutant emissions, simple management, and low construction and operation costs

Active Publication Date: 2014-05-21
SHANGHAI EMPEROR OF CLEANING HI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wastewater treated by the above method is still difficult to meet the first-level standard of the integrated sewage discharge standard (GB8978-1996), and t

Method used

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  • Treatment process for polycrystalline silicon cutting mortar recovered wastewater

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Effect test

Embodiment 1

[0031] A trial production test was carried out on a polysilicon cutting mortar recycling wastewater treatment process (see attached figure 1 ), the system design water volume is 800m 3 / d. Influent water (most data) indicators are: COD concentration is 15000mg / L~25000mg / L, pH is 11~13, SS (suspended solids in water quality) concentration is 10000mg / L~30000mg / L, silicate concentration is 20000mg / L L~30000mg / L.

[0032] Polysilicon cutting mortar recycling wastewater treatment process: adjust the pH of the polysilicon cutting mortar recycling wastewater to react to precipitate silicate radicals and flocculate the suspended solids of silicon carbide powder, then pass through plate and frame filter press to achieve solid-liquid analysis, then oxidize it by Fenton, and then undergo hydrolysis and acidification Treatment, followed by UASB anaerobic treatment, then contact oxidation aerobic treatment, and finally solid-liquid separation through the secondary sedimentation tank. in...

Embodiment 2

[0042] A trial production test was carried out on the waste water recovered from a polysilicon cutting mortar. The design water volume of the system is 600m 3 / d. Influent water (most data) indicators are: COD concentration is 15000mg / L~25000mg / L, pH is 11~13, SS (suspended solids in water quality) concentration is 10000mg / L~30000mg / L, silicate concentration is 20000mg / L L~30000mg / L.

[0043] Polysilicon cutting mortar recycling wastewater treatment process: adjust the pH of the polysilicon cutting mortar recycling wastewater to react to precipitate silicate radicals and flocculate the suspended solids of silicon carbide powder, then pass through plate and frame filter press to achieve solid-liquid analysis, then oxidize it by Fenton, and then undergo hydrolysis and acidification treatment, followed by UASB anaerobic treatment, then contact oxidation aerobic treatment, and finally solid-liquid separation through the secondary sedimentation tank; among them,

[0044] The desc...

Embodiment 3

[0053] Trial production test was carried out on polysilicon cutting mortar recovery wastewater treatment process, the design water volume of the system is 700m 3 / d. Influent water (most data) indicators are: COD concentration is 15000mg / L~25000mg / L, pH is 11~13, SS (suspended solids in water quality) concentration is 10000mg / L~30000mg / L, silicate concentration is 20000mg / L L~30000mg / L.

[0054] Polysilicon cutting mortar recycling wastewater treatment process: adjust the pH of the polysilicon cutting mortar recycling wastewater to react to precipitate silicate radicals and flocculate the suspended solids of silicon carbide powder, then pass through plate and frame filter press to achieve solid-liquid analysis, then oxidize it by Fenton, and then undergo hydrolysis and acidification treatment, followed by UASB anaerobic treatment, then contact oxidation aerobic treatment, and finally solid-liquid separation through the secondary sedimentation tank; among them,

[0055] The d...

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Abstract

The invention discloses a treatment process for polycrystalline silicon cutting mortar recovered wastewater. The treatment process comprises the following steps: regulating pH of polycrystalline silicon cutting mortar recovered wastewater to 9.5-9.9, reacting and filter-pressing; carrying out Fenton oxidation treatment; implementing hydrolytic acidification treatment, upflow anaerobic sludge blanket (UASB) anaerobic treatment and aerobiotic contact oxidation treatment, and carrying out solid-liquid separation through settling by a secondary sedimentation tank. The treatment process is simple and convenient in flow, relatively low in construction and operation cost, simple in management, and capable of effectively treating the polycrystalline silicon cutting mortar recovered wastewater.

Description

technical field [0001] The invention relates to a treatment process for recycling waste water from polysilicon cutting waste mortar. Background technique [0002] In June 2004, after Shanghai developed its own cutting machine, the cutting of polysilicon wafers developed rapidly in China, and the consumption of cutting mortar also increased accordingly, accompanied by a large amount of cutting waste mortar. In order to recover and recycle the resources in the waste mortar, it is necessary to recycle the waste mortar, and a part of waste water will be generated in this process. The COD concentration of this wastewater is generally 15000mg / L~25000mg / L, the pH is 11~13, the SS concentration is 10000mg / L~30000mg / L, the silicate concentration is 20000mg / L~30000mg / L, and the organic matter is mainly polyethylene glycol Alcohol has a complex structure and poor biodegradability, and it is very difficult to treat wastewater. If it is not properly treated and discharged into water bo...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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