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

A treatment method, crystalline silicon technology, applied in the direction of energy wastewater treatment, water/sewage multi-stage treatment, degassed water/sewage treatment, etc., can solve the problems of large economic investment, long time, hindering large-scale application of wastewater treatment methods, etc. , achieve the effect of reducing COD and good treatment effect

Active Publication Date: 2009-06-17
WUXI SUNTECH POWER CO LTD
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Problems solved by technology

[0006] 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-ment

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 1As shown, 5 tons of raw water with isopropanol content of 1-2% is transported from the raw water pool of crystalline silicon texturing wastewater to the pretreatment pool and heated to 60±3°C with municipal steam, the pH value is adjusted to 6, and then transported to Vacuum tank, use trace steam to keep it warm, at the same time use compressed air to aerate the vacuum tank, and vacuumize while aerating, maintain the vacuum degree in the vacuum tank at -0.04~-0.085MPa, keep the vacuum The temperature in the tank is 40-60°C, the aeration time is 30 minutes, and the vacuuming time is 40 minutes at the same time. The gas pumped out by the vacuum pump is condensed in the series condenser through the supply of industrial chilled water. The temperature of the industrial chilled water is the condensation The temperature is set at 12°C, and the condensed liquid is periodically discharged to the recovery liquid storage tank. The aerated liquid in the vacuum tan...

Embodiment 2

[0039] Using a process similar to that in Example 1, heat 4 tons of raw water with an isopropanol content of 1 to 2% to 75°C, adjust the pH value to 10, transport it to a vacuum tank, keep it warm with a small amount of steam, and aerate it for a period of time Set it to 45 minutes, and at the same time set the vacuum time to 60 minutes, set the condensation temperature to 9°C, and use a series condenser. The concentration of isopropanol recovered once was determined to be 15.15%, and the COD removal rate was 63.5%. After the secondary treatment, the secondary recovered isopropanol obtained was determined to be 37.31% in concentration.

Embodiment 3

[0041] Using a process similar to that in Example 1, heat 4 tons of primary treatment recovery liquid with a content of isopropanol of about 10% to 75° C., adjust the pH value to 10, transport it to a vacuum tank, keep it warm with a small amount of steam, and expose The gas time is set to 45 minutes, the vacuum time is set to 60 minutes, the condensation temperature is set to 9°C, and a series condenser is used. The secondary recovered isopropanol concentration was determined to be 40.31%, and the COD removal rate was 50.44%.

[0042] The processing method of crystalline silicon texturing wastewater provided by the present invention is compared with existing wastewater treatment methods:

[0043] COD removal usually adopts multi-stage filtration, biological treatment, Fenton reaction and other methods. Multi-stage filtration usually requires a large investment in equipment, and is prone to secondary pollution during the process. Some filter units mainly play a role of interce...

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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

technical field [0001] 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 [0002] 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. [0003] The so-called suede refers to a series of regular or irregular surface shapes with different heights and sizes that exist on the surface of objects. Due to...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/02C02F1/66C02F1/20
CPCY02W10/37
Inventor 周华李松强
Owner WUXI SUNTECH POWER CO LTD
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