DOI: 10.11799/ce202502003
Design and application of high-salt wastewater treatment technology in coal chemical industry:a case study
CHENG Haitao
WANG Xiaoqiang
WANG Yuqian
ZHAO Zemeng
Abstract：The modified design for wastewater treatment is introduced,for the high-salt wastewater produced by the concentration unit of the reuse water unit of China Coal Inner Mongolia Mengda New Energy Chemical Company,which has the characteristics of large COD change,high hardness,high total silicon and high salinity.After technical transformation,the process adopted is:high-density tank+multi-media filter+ultrafiltration+ion exchange resin+reverse osmosis+silicon removal sedimentation tank+purification+nanofiltration+advanced oxidation(AOP)+multi-effect evaporation crystallization.The overall operation of the system is stable,and the nanofiltration salt separation effect is excellent.The water recovery rate is 98.1%,which is used in circulating water station.The purity of the by-products of sodium chloride is 98.8%,satisfying the Grade I standard of industrial dry salt of"Sodium Chloride for Coal Chemical By-product Industry"(T/CCT 002-2019),and the purity of the sodium sulfate is 99.3%,meeting the grade A standard of"Sodium Sulfate for Coal Chemical By-product Industry"(T/CCT 001-2019).The salt recovery rate is 88.2%,and the impurity salt rate is 11.8%,achieving the resource utilization of water and salt and meeting the standard for zero liquid discharge.
Keywords：coal chemical industryhigh salt wastewaternanofiltrationevaporation crystallization
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 19-26 )