A kind of silica gel wastewater treatment method

A waste water treatment, silica gel technology, applied in the direction of natural water treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high cost, low process efficiency, poor effect, etc.

Active Publication Date: 2020-05-05
SHANDONG JINHUI MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low efficiency, high cost and poor effect of the existing silica gel pickling wastewater treatment process, the present invention provides a silica gel wastewater treatment method

Method used

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Embodiment Construction

[0019] The present invention is described below in conjunction with examples, which are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0020] Silica gel production wastewater with a silica gel content of 0.52%, a salt content of 2-3%, and a pH of 2-3, totaling 10 tons, will be harmlessly recycled and treated. The specific steps are:

[0021] 1) One-time pressure filtration: introduce the wastewater into the sedimentation tank, let it settle for 1 hour, pump out the wastewater containing a lot of sediment at the bottom, and perform pressure filtration. The pressure of the filter pressure is 0.4MPa, and 200kg of large-particle silica gel particle slurry containing water is separated. ;

[0022] 2) Immersion ultrafiltration: Negative pressure suction operation mode is adopted, the pore size of the ultrafiltration membrane used in the immersion ultrafiltration equipment is 0.0341 μm, and the material of the immersion ...

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Abstract

The invention discloses a silica gel wastewater treatment method which comprises the steps of two times of filter presses, two times of ultrafiltration, three times of nanofiltration, evaporation crystallization and the like which are interpenetrated with each other. The method has the beneficial effects the the process of the silica gel wastewater treatment method can be recyclable, zero emissioncan be realized, and water, silica gel and inorganic salts in silica gel wastewater can be recovered; in the process, except for adding of pH adjusting substances, no other medicaments are added, andno other impurities are introduced, so the the process integration level is high, and the cost is saved; the silica gel wastewater treatment method adopts an enhanced submerged ultrafiltration film to pretreat the silica gel wastewater, does not need to adjust the pH value of the silica gel wastewater in the early stage, and can achieve the purpose of pretreatment by adjusting the pH value of nanofiltration produced water.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a silica gel wastewater treatment method. Background technique [0002] The wastewater generated during the silica gel preparation process mainly comes from the silica gel pickling process. The acidity of the pickling wastewater is high, and the pH value is 2-3. It contains a large amount of sulfate and silicate and residual silica gel, which makes the pickling wastewater difficult to treat. [0003] The existing silica gel pickling wastewater treatment process generally uses quicklime to adjust the pH first, and then adds flocculants, such as polyaluminum chloride, polyferric chloride, polyacrylamide, etc., to make the silicon-containing wastewater flocculate and precipitate, and then press filter to Solid-liquid separation. The above-mentioned treatment process will generate a large amount of solid waste, and introduce a large amount of calcium and magnesium impurities into the wastewat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01B33/14C02F103/34
CPCC01B33/14C02F1/001C02F1/04C02F1/442C02F1/444C02F1/66C02F9/00C02F2001/007C02F2103/34C02F2301/08Y02P20/10
Inventor 宋玉志张兵涛李爱波梁萍宋晓萌
Owner SHANDONG JINHUI MEMBRANE TECH
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