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Treatment method of industrial wastewater in silicon wafer mortar recovery

A technology for industrial wastewater and treatment methods, which is applied in ceramic wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as lack of water resources, and achieve the effect of saving water resources

Inactive Publication Date: 2013-11-27
HENAN XINDAXIN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology does not provide a solution to the pollution of the industrial waste water itself. my country is a country with relatively short water resources, and the recycling and reuse of water resources is particularly important.

Method used

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  • Treatment method of industrial wastewater in silicon wafer mortar recovery
  • Treatment method of industrial wastewater in silicon wafer mortar recovery
  • Treatment method of industrial wastewater in silicon wafer mortar recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 A kind of industrial wastewater treatment and resource recycling method, see figure 1 , including the following steps:

[0023] (1) Wastewater pretreatment: collect and store the pickling wastewater, alkali washing wastewater and ion exchange resin washing wastewater generated during the recycling process of crystal silicon cutting waste mortar, and then separate the pickling wastewater, alkali washing wastewater and ion exchange resin Washing wastewater is mixed to obtain mixed wastewater A. The volume ratio of the acid washing wastewater, alkali washing wastewater and ion exchange resin washing wastewater is 1:0.5~1:1~1.5, for example: pickling wastewater, alkali washing wastewater and ion exchange The volume ratio of resin washing wastewater is 1:0.5:1, the volume ratio of pickling wastewater, alkali washing wastewater and ion exchange resin washing wastewater is 1: 1: 1.5, the volume ratio of pickling wastewater, alkali washing wastewater and ion exchan...

Embodiment 2

[0038] Example 2 The method and steps of this example are basically the same as in Example 1, except that the reagent used in the flocculation and sedimentation treatment is a mixture of coagulant polyaluminum chloride and polyferric sulfate flocculant, and the coagulant is polymerized The quality of aluminum chloride accounts for 0.1 to 0.3% of the quality of mixed wastewater A, such as 0.1%, 0.2%, and 0.3%. The mass of polyferric sulfate accounts for 0.01-0.03% of the mass of mixed wastewater A, such as 0.01%, 0.02%, and 0.03%.

[0039] The design of this industrial wastewater treatment system is carried out according to the characteristics of the recycling industry of crystal silicon cutting waste mortar, including pretreatment of the system, pH value adjustment, flocculation and sedimentation treatment, anaerobic, aerobic, acid hydrolysis, high-density aerobic A series of processes such as filtration, flocculation and bottom treatment, secondary sedimentation, final sedime...

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Abstract

The invention relates to a treatment method of industrial wastewater in silicon wafer mortar recovery, aiming at recycling and purifying industrial wastewater of silicon wafer mortar by utilizing the method and the system. According to the invention, the industrial wastewater is classified and mixed and is purified by sequentially carrying out the following procedures: wastewater pretreatment, flocculation and sedimentation treatment, anaerobic treatment, aerobic treatment, twice sedimentation, hydrolysis acidification, high-density aerobic filtration, final precipitation and advanced treatment. The treatment method provided by the invention has the advantages that advanced treatment is carried out on a large amount of industrial wastewater containing acid and alkali corrosion and high COD content through the steps and the industrial wastewater in industrial production is recycled, so that the industrial wastewater is recycled to save water resources.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating industrial wastewater in the recovery of crystal silicon wafer mortar. Background technique [0002] Solar crystalline silicon wafers are the basic materials of the photovoltaic industry. During the process of cutting crystalline silicon wafers into pieces, a large amount of waste mortar will be generated, which needs to be recycled. The recycling of waste mortar requires the use of cutting fluid and cutting blades. Solid-liquid separation and chemical purification and other treatments include acid washing, alkali washing, water washing and classification, extraction and separation, pH adjustment, ion exchange and impurity removal, distillation and drying of materials in waste mortar. These processes will produce a large amount of industrial wastewater. According to statistics, about 30-50 tons of industrial wastewater is produced for every ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/12
Inventor 王杰高敏杰张孟雷徐元清
Owner HENAN XINDAXIN SCI & TECH
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