Treatment of high-salinity wastewater (salt removal, organic matter removal)
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At present, our company has a flow of wastewater amounting to 500 t/d, which contains some organic substances; however, the main component is chloroform. We are looking for ways to remove chloroform. Do any experts have any suggestions? After removing the organic substances, the wastewater contains sodium chloride and calcium chloride. I am looking for a way to separate these two compounds; sodium chloride may contain calcium chloride within it. It is intended to be treated as ordinary solid waste, but I want to obtain calcium chloride of industrial quality. Do any experts have any good suggestions?
First, steam the water; the salt then crystallizes out in chloroform, followed by solid-liquid separation.
Actually, the main goal is to separate sodium chloride from calcium chloride. According to what you said, the salts may contain a small amount of chloroform; is it possible to remove that beforehand?
Chloroform can be separated by evaporation, while calcium chloride can be separated by crystallization.
Chloroform is heavier than water and not suitable for removal by simple evaporation.
The chloroform content is below one part in a thousand.
If the calcium chloride content is so low, it would be too costly to extract it, making it uneconomical. Furthermore, the boiling point of a saturated sodium chloride solution is lower than that of a calcium chloride solution; therefore, sodium chloride refined salt precipitates first, leaving the calcium chloride solution containing some sodium chloride. When extracting industrial-grade calcium chloride, if you do it this way, there’s something wrong with your approach
Firstly, based on our experience, the water in question should be wastewater resulting from extraction; chloroform is used as an extractant in this process. We have handled such wastewater in the fiber industry over the first half of this year. If you are interested, please leave your contact information so that we can send you some technical materials for you to review first
This post was last edited by Gorou’s Eight Trigrams Staff on 2015-12-24 at 12:49. Hello! Yes, for wastewater containing synthetic fibers, if you have any relevant information, feel free to call me; we can discuss potential cooperation.
First, remove chloroform using a clarification tank; then, depending on their concentrations, sodium chloride and calcium chloride are processed – if their concentrations are low, membrane concentration is used first, followed by evaporation of the concentrated solution.