... ,non-metallic mineral processing industries.4), chlor-alkali industry: hydrochloric acid, liquid, electrolyte and so on. ... wastewater, textile wastewater, food wastewater, sewage, the pharmaceutical industry, sewage, etc.).6) iron and steel enterprise: pickling ... of alkaline, acidic, corrosive posts.8) coal industry, coal chemical industry in the corrosive liquids, coal slurry delivery; washing ...