| abstract |
The invention discloses a salt-containing glycerin wastewater treatment system and a process. The whole process flow mainly includes a reaction process, an evaporation process, a crystallization process, a filtration process and a drying process. This invention proposes for the first time the use of the "principle of ammonia-alkali reaction" to treat high-salt glycerin wastewater, which mainly solves the problem of a large amount of glycerin wastewater containing calcium chloride produced in the production process of propylene oxide and epichlorohydrin in the chlor-alkali industry, and focuses on solving the traditional method of wastewater treatment The process produces low-value-added calcium chloride with low quality, basically accumulated as solid waste, etc., which are difficult to handle, and the adverse effects of chloride ions on the biochemical process of wastewater treatment. By extracting calcium ions and chloride ions separately, the calcium The ion extraction rate reaches over 99%, and the chloride ion extraction rate reaches over 95%, and high-quality calcium carbonate and ammonium chloride are produced as by-products, which have high economic benefits and social and environmental protection benefits. |