Seeking expert advice: How to treat sodium sulfate wastewater?
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The wastewater at a rate of 10 tons per hour contains 5 wt% sodium sulfate, and it cannot be discharged directly. We would like to first separate some pure water using membrane separation, and then concentrate the remaining wastewater through triple-effect evaporation. Is this approach feasible? Are there any better separation methods? Thank you!
There are no better separation methods. However, you need to consider steam consumption; if the steam supply is insufficient, you can try MVR.
Treatment can be carried out using membrane concentration + MVR, with the process consisting of ultrafiltration + RO + high-pressure flat membranes. This step allows the salt concentration to be increased to 15%~20%, and around 7 tons of water can be separated; the remaining approximately 3 tons of concentrated water is sent to the MVR system. This can **reduce operating costs; three-effect evaporation is not recommended.
What is cryogenic crystallization, and is the equipment investment high?
Extraction treatment can be carried out using a CWL-type centrifugal extractor
What other components are present in the water besides sodium sulfate? It would be best to provide detailed parameters so that a solution can be proposed. Hehe
Summer♂Blue posted on 2016-4-26 13:15 Requesting the same: cryogenic crystallization + membrane separation