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A kind of wastewater treatment method in photovoltaic industry

A technology for wastewater treatment and industry, applied in the field of wastewater treatment technology, can solve the problems of difficult wastewater and difficult to remove suspended solids in wastewater, and achieve the effect of easy subsequent treatment and reduced content

Inactive Publication Date: 2016-02-03
SHANGHAI SHERAGREEN ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wastewater contains a large amount of sodium silicate, and sodium silicate can make the suspended solids in the water more uniformly dispersed and the colloidal particles more stable. Generally, it is difficult to remove the colloidal particles in the wastewater with conventional agents such as polyaluminum chloride and polyacrylamide. Therefore, it is difficult to remove suspended solids in wastewater by coagulation
The conventional method of water treatment to remove suspended solids is nothing more than the method of filtration and sedimentation, but it is also very difficult to filter unstabilized wastewater

Method used

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  • A kind of wastewater treatment method in photovoltaic industry

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Embodiment 1

[0032] The alkaline washing wastewater is collected in the alkaline wastewater pool, and the pickling wastewater is collected in the acidic wastewater pool. The alkali washing wastewater in the alkali washing wastewater pool is passed into the sedimentation tank, and calcium oxide is added into the sedimentation tank. In order to mix the calcium oxide and the alkali washing wastewater as quickly as possible, the sedimentation tank is designed as a stirring tank, and the calcium oxide meets water to react to form hydroxide Calcium, the generated calcium hydroxide reacts with the sodium silicate salt in the alkali washing wastewater to form calcium silicate precipitates. In addition, a mud scraper can be installed in the sedimentation tank to avoid the generated calcium silicate precipitates and impurities contained in calcium oxide The sludge discharge pipe is blocked, so that the sludge cannot be discharged by relying on hydrostatic pressure. The hydraulic load in the sedimenta...

Embodiment 2

[0034] The alkaline washing wastewater is collected in the alkaline wastewater pool, and the pickling wastewater is collected in the acidic wastewater pool. The alkali washing wastewater in the alkali washing wastewater pool is passed into the sedimentation tank, and magnesium chloride is added to the sedimentation tank. In order to mix the magnesium chloride and the alkali washing wastewater as quickly as possible, the sedimentation tank is designed as a stirring tank, and the magnesium chloride and the sodium silicate in the alkali washing wastewater The reaction generates magnesium silicate precipitation. In addition, a mud scraper can be installed in the sedimentation tank to avoid the generated magnesium silicate precipitation and impurities contained in magnesium chloride from clogging the sludge discharge pipe, resulting in the inability to discharge the sludge by relying on hydrostatic pressure. The hydraulic load is 0.5mm / s, and it stays in the sedimentation tank for 4...

Embodiment 3

[0036]The alkaline washing wastewater is collected in the alkaline wastewater pool, and the pickling wastewater is collected in the acidic wastewater pool. The alkali washing wastewater in the alkali washing wastewater pool is passed into the sedimentation tank, and calcium oxide and magnesium chloride are added to the sedimentation tank. In order to mix the calcium oxide, magnesium chloride and alkali washing wastewater as quickly as possible, the sedimentation tank is designed as a stirring tank, and the calcium oxide meets water. The reaction generates calcium hydroxide, and the generated calcium hydroxide reacts with the sodium silicate salt in the alkali washing wastewater to form a calcium silicate precipitate, and the magnesium chloride reacts with the sodium silicate salt in the alkali washing wastewater to form a magnesium silicate precipitate. In addition, the sedimentation tank A mud scraper can be installed in the sedimentation tank to avoid the generated calcium si...

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Abstract

The invention discloses a wastewater treatment method in a photovoltaic industry. The wastewater treatment method comprises the following steps: respectively collecting alkaline wash wastewater and pickling wastewater; adding metal ions needed by generation of silicate into the alkaline wash wastewater, reacting the metal ions with sodium silicate in the alkaline wash wastewater to generate a silicate precipitate, and filtering the silicate precipitate, thereby obtaining filtrate; adding the obtained filtrate into the pickling wastewater, thereby regulating the PH value to be 7.5-8.5; adding a coagulant and a coagulant aid into the pickling wastewater, thereby obtaining a coagulating precipitate; and concentrating the coagulating precipitate, and performing filter pressing. According to the method disclosed by the invention, colloidal particles in the wastewater can be destabilized, so that subsequent wastewater treatment is easily performed.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a wastewater treatment method in the photovoltaic industry. Background technique [0002] In the process of producing silicon carbide, the amount of sewage and pollutants discharged in different process sections and at different times will be very different. The sources of wastewater in this process mainly include recycled material soaking wastewater, alkaline washing wastewater, and pickling wastewater. , and domestic wastewater in the factory area, etc., whose main feature is that the treatment of alkaline washing wastewater is relatively difficult. This difficulty is mainly manifested in: after the reclaimed material is soaked and cleaned in water, alkali will be added to remove the silicon dioxide in the raw material, because the sodium silicate formed by the silicon dioxide in contact with alkali is soluble in water, and it can be removed by washing with water . However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 李志鹏
Owner SHANGHAI SHERAGREEN ENVIRONMENTAL TECH