Processing method of crystalline silicon texture etch wastewater and system for the same

Abstract

The invention belongs to the field of etching process of crystalline silicon solar cell. In particular, the invention relates to a method for treating crystalline silicon etching waste water and a system used by the method. The method for treating the crystalline silicon etching waste water comprises: by heating the crystalline silicon etching waste water and after adjusting the pressure and pH value, blowing off the waste water in the vacuum state; and condensing gaseous mixture of isopropanol blown off from the waste water by a condenser, obtaining the isopropanol with certain concentration, completing the first treatment, and simultaneously reducing COD of the waste water to a lower level. Moreover, the isopropanol recovering liquor after the first treatment is subjected to secondary treatment to obtain the isopropanol recovering liquor with higher concentration. By the method for treating the crystalline silicon etching waste water, the isopropanol can be effectively recovered from the crystalline silicon etching waste water, and the COD of the waste water can also be reduced.

Description

A treatment method for crystalline silicon texturing wastewater and a system used in the treatment method technical field The invention belongs to the field of crystalline silicon solar cell texturing technology, and in particular, the invention relates to a treatment method of crystalline silicon texturing wastewater and a system used in the treatment method. Background technique Since the advent of solar cells, improving the conversion efficiency of solar cells has been the goal of scientists and engineers. Improving the intrinsic characteristics of solar cells and improving the ability of solar cells to absorb light are the two main directions to improve the conversion efficiency of solar cells. Anti-reflection film and suede are the main means to improve the light absorption of solar cells. Therefore, in the field of solar cells, how to prepare an effective textured surface is a very hot topic. The so-called suede refers to a series of regular or irregular surface s...

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Problems solved by technology

To discharge the above-mentioned wastewater, the isopropanol must be blown off by aeration, and it takes a long time to completely blow off it, and the generated isopropanol gas is easy to pollute the environment, which hinders the development and application of this kind of wastewater aeration treatment process

Although the organic isopropanol in the above-mentioned waste water can be oxidized to the inorganic state by adopting Fenton (fenton) reaction reagent, it needs larger economic investment, and it is not conducive to the reuse of the isopropanol in the environmental protection demand and this waste water. , which hinders the large-scale application of this wastewater treatment method in texturing wastewater treatment

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