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A cadmium-ammonia waste water zero-discharge process for a thin-film solar cell production line

A solar cell and production line technology, which is applied in the direction of energy wastewater treatment, water pollutants, multi-stage water treatment, etc., can solve the problems of incompatibility and other problems, achieve localization, reduce investment and operating costs, and solve zero discharge of cadmium and ammonia wastewater Effect

Active Publication Date: 2017-10-24
HANGZHOU GREEN ENVIRONMENTAL PROTECTION TECH DEV +1
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Problems solved by technology

[0005] After many years of theoretical research and related engineering practice, the inventor invented the zero discharge process of cadmium and ammonia wastewater in the thin film solar cell production line to solve the problem that the currently introduced thin film solar cell production line does not match the wastewater treatment

Method used

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  • A cadmium-ammonia waste water zero-discharge process for a thin-film solar cell production line

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example 1

[0034] Example 1: A thin-film solar technology Co., Ltd., copper indium gallium selenium solar cell module industrialization project (first phase project).

[0035] 1. Design water volume

[0036] The volume of cadmium and ammonia wastewater in the workshop is 87.8m3 / d, with an average of 3.66m3 / h.

[0037] 2. Design water quality

[0038] Total Cd57.62mg / L, ammonia 5161.69mg / L, S concentration 369.59mg / L, COD Cr 10000.00mg / L, pH9~11.

[0039] 3. Material output

[0040] (1) The produced water is reused in the pure water station of the production process, with a water volume of 87.8m 3 / d, water quality main control indicators: the concentration of cadmium and other metals is less than 0.0005mg / L, the concentration of ammonia nitrogen is 0.60mg / L, COD cr 2.90mg / L, pH6.5~7.5.

[0041] (2) Tail gas emission, the total amount of ammonia gas is 169.95g / d.

[0042] (3) Hazardous waste entrusted to qualified units for disposal: its solid components: compounds containing cadmi...

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Abstract

The invention relates to a cadmium-ammonia waste water zero-discharge process for a thin-film solar cell production line. According to main steps of the process, the cadmium-ammonia waste water from a workshop firstly flows through a first-stage precipitating tank to precipitate most suspended particles, the precipitates after being dehydrated are treated as hazardous waste, and a liquid supernatant is discharged as waste water into an adjusting tank; the waste water is subjected to precipitation of compounds of cadmium and other metals through a second-stage precipitating tank, the precipitates after being dehydrated are treated as hazardous waste, and a liquid supernatant as waste water is lifted to an evaporator and subjected to evaporation and crystallization; the crystals contain cadmium and are treated as hazardous waste, noncondensable gas is discharged after being treated and meeting standards, and a condensate adopted as waste water is lifted to an ammonia degassing membrane to remove ammonia; a thick aqueous ammonium sulfate solution at the acid side of the membrane is discharged into the adjusting tank, and the waste water is filtered by a reverse osmosis membrane; and membrane thick water is discharged into the adjusting tank and produced water is returned to a production process. The process can achieve zero discharge of the cadmium-ammonia waste water of the thin-film solar cell production line, achieves localization of engineering equipment and agents, and reduces the investment and running cost.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a process for zero discharge of cadmium and ammonia wastewater in a thin-film solar cell production line. Background technique [0002] At present, in the production line of thin-film solar cells imported from abroad, the commonly used raw materials are thiourea, ammonia water and cadmium, molybdenum, copper, indium, gallium, selenium, zinc and other compounds, and the production wastewater contains high concentrations of cadmium and ammonia and a small amount of sulfur , glass particles, molybdenum particles and copper, indium, gallium, selenium, zinc and other compounds. This wastewater is called cadmium-ammonia wastewater because of its relatively high concentration of cadmium and ammonia. Cadmium ammonia wastewater has the characteristics of high concentration, high toxicity, and strong hazards. The discharge standard control is very strict, and it is also a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/16C02F101/20
CPCC02F1/04C02F1/08C02F1/20C02F1/441C02F1/56C02F9/00C02F2001/007C02F2101/16C02F2101/20C02F2301/08Y02W10/37
Inventor 奕家鸣奕锦伟
Owner HANGZHOU GREEN ENVIRONMENTAL PROTECTION TECH DEV
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