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  • Which industry produces the most waste salt in China?
  • In the synthesis of pesticide intermediates, pharmaceutical preparations, printing, and dyeing, as well as the water treatment process of evaporation and crystallization of high salt wastewater, accompanied by the generation of a large amount of by-product salt, namely waste salt. The chemical industry is the largest source of waste salt in China.
  • How oxidation technology is used in the treatment of industrial waste salt?
  • By combining the salt washing technology with in-situ oxidation technology for the treatment of industrial waste salt, the chemical oxygen demand (COD) of the waste salt solution is reduced by 99% during the treatment process, and at the same time, produce refined crystalline salt with high purity. (Xu et al. 2019 ).
  • How to treat high-salt wastewater in coal chemical industry of China?
  • This review is mainly about the treatment technologies of salt-containing wastewater and high-salt wastewater in coal chemical industry of China. In the treatment of high-salt wastewater, coal chemical industry projects in China mostly use the “double membrane” reuse technology of “ultrafiltration + reverse osmosis”.
  • How is waste salt treated?
  • The initial step in the treatment of waste salt is drying. Following drying, the waste salt is then sent to a pyrolysis furnace for further processing. The crucial aspect of pyrolytic carbonization is temperature control. The waste salt is pyrolyzed at temperatures ranging from 300 to 850°C after drying.