System and treatment process for purification and salt separation of electroplating high-salt wastewater
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A high-salt wastewater treatment technology, applied in water/sewage treatment, biological water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of high-salt wastewater treatment, complex components, etc., and achieve continuous production , Improve the separation effect, the effect of smooth and simple system flow
Inactive Publication Date: 2019-10-29
GUANGZHOU ANSAI CHEM IND
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According to different industry products, the salt composition in high-salt wastewater varies greatly. According to statistics, the amount of high-salt wastewater in Guangdong Province exceeds 300,000 tons, and the amount of solids converted into crystal salts reaches nearly 100,000 tons. Electroplating sweat is reverse osmosis The concentrated res
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Embodiment 1
[0031] An electroplating high-salt wastewater purification and salt separation system, which includes:
[0032] Pretreatment unit: used to treat ammonia nitrogen, COD, cyanide and metal substances in wastewater;
[0033] Filtration treatment unit: used to filter the pretreated wastewater to obtain super-concentrated waste liquid and return water;
[0034] Evaporation and crystallization unit: using heat pump low-temperature evaporation components and induced seeds to treat super-concentrated waste liquid to recover crystallized salt;
[0035] The pretreatment unit, filtration treatment unit and evaporation crystallization unit are connected in sequence.
[0036] The filtration treatment unit includes a membrane filter unit and a reverse osmosis unit, and the high-salt wastewater first enters the membrane filter unit to filter impurities after passing through the pretreatment unit;
[0037] The membrane filter part and the reverse osmosis part are connected in sequence, the f...
Embodiment 2
[0043] An electroplating high-salt wastewater purification and salt separation process:
[0044] The high-salt wastewater from an electroplating factory was purified and salt-separated. After multiple tests, the salt content of the high-salt wastewater was 21-30wt%, Cl - The concentration is 1500~2000 mg / L, SO 4 2- The concentration is 2000~2500 mg / L, K + The concentration is 600~850 mg / L, COD 130~160 mg / L, Ni 2+ The concentration is 200~350 mg / L, Zn 2+ The concentration is 200~350 mg / L, Cr 2+ The concentration is 200~350 mg / L, Cu 2+ The concentration is 200~350 mg / L;
[0045] 1) Pretreatment of high-salt wastewater: add microbial strains to high-salt wastewater to remove ammonia nitrogen, COD, organic matter and cyanide in the wastewater, and after standing still, add hydroxide ions and carbonate ions to generate hydroxide in the wastewater Chromium precipitation, nickel hydroxide precipitation, copper hydroxide precipitation, zinc carbonate and other precipitates are ...
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Abstract
The invention belongs to the technical field of polluted wastewater treatment, and specifically relates to a system and a treatment process for purification and salt separation of electroplating high-salt wastewater. The system comprises a high-salt wastewater pretreatment unit, a filtration treatment unit and an evaporation crystallization unit. The treatment process comprises the following steps: 1) high-salt wastewater pretreatment: a step of treating ammonia nitrogen, COD, organic matters and cyanide in wastewater, and allowing metal substances in the wastewater to be precipitated; 2) filtration treatment: a step of subjecting the wastewater to membrane filtration so as to obtain ultra-concentrated wastewater and a filtrate; 3) reverse osmosis treatment: a step of subjecting the filtrate to reverse osmosis filtration so as to obtain a filter residue and reflux reclaimed water; and 4) evaporation crystallization treatment: a step of allowing the filter residue to undergo pH value adjustment and crystallization treatment by using a heat-pump low-temperature evaporation technology and adding an inducing seed crystal so as to recover crystalline salt. According to the invention, byadoption of the heat-pump low-temperature evaporation technology, energy consumption is greatly saved; and a salt product and circulating reclaimed water are obtained, so zero discharge and resourceful utilization of the wastewater can be realized, and the purpose of circular economy is reached.
Description
technical field [0001] The invention belongs to the technical field of polluted wastewater treatment, and in particular relates to an electroplating high-salt wastewater purification and salt separation system and a treatment process thereof. Background technique [0002] With the acceleration of my country's industrialization process, high-salt wastewater will be produced in many production areas, such as printing and dyeing, papermaking, chemical industry, pesticides, seafood processing, etc. According to different industry products, the salt composition in high-salt wastewater varies greatly. According to statistics, the amount of high-salt wastewater in Guangdong Province exceeds 300,000 tons, and the amount of solids converted into crystal salts reaches nearly 100,000 tons. Electroplating sweat is reverse osmosis The concentrated residual wastewater contains a large amount of sodium salt and a small amount of potassium salt, and its composition is extremely complex. The...
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