... acid phosphate fertilizer industry: acid, liquor, sewage, water, fluorine-containing silica gel silicic acid, phosphoric acid ... acid, liquid, electrolyte and so on.5) water treatment industry: water, high pure water, sewerage (sewage leather, electroplating effluent,electronic ... sewage, etc.).6) iron and steel enterprise: pickling system, sulfuric acid, hydrochloric acid positions, with impurities of ...