To discharge or reuse wastewater up to the standard after treatment, various chemicals are required in the treatment process.

Chemical Treatment of Wastewater

These chemicals can be classified according to their use:

  • Flocculant: It uses for solid-liquid separation, used in the primary sedimentation tank, secondary sedimentation tank, flotation tank, and tertiary treatment or advanced treatment.Such as Poly Aluminium Chloride (PAC).
  • Coagulant chemicals: Auxiliary flocculant strengthens the coagulation effect.Such as Polyacrylamide (PAM).
  • Conditioning chemicals: It is used for conditioning the sludge before dewatering, which includes some flocculants and coagulation aids.Such as ferric chloride wastewater treatment.
  • Demulsifier: It is mainly used for pretreatment of oily wastewater containing emulsified oil before flotation.Such as Surfactant.
  • Defoamer: It is mainly used to eliminate a large amount of foam in the process of aeration or agitation.
  • pH regulation chemicals: It is used to adjust the pH value of acidic wastewater and alkaline wastewater to neutral.Such as Sulfuric acid or sodium hydroxide in water treatment.
  • Redox chemicals: It is used for the treatment of industrial wastewater containing oxidative or reducing substances.Such as chlorine water treatment
  • Disinfectant: disinfectant for water treatment.Such as sodium hypochlorite water treatment.

Although there are many types of chemicals, a chemical is used on different occasions and has different functions, so it will have different names.