The commonly used chemicals in tap water treatment include the following:
Flocculant: Flocculant is used to aggregate small particles suspended in water into larger flocs for subsequent filtration and sedimentation. Common flocculants include polyaluminum chloride (PAC), polyferric sulfate (PSF), and polyacrylamide (PAM).
Disinfectant: Disinfectants are used to inactivate bacteria, viruses, and other microorganisms in water, ensuring the hygiene and safety of tap water. Common disinfectants include chlorine gas, sodium hypochlorite (bleaching powder), ozone, and chloramine. Among them, chlorine gas and sodium hypochlorite are the most commonly used disinfectants.
PH regulator: pH regulator is used to control the acidity and alkalinity of water to ensure its stability and suitable water quality conditions. Commonly used pH regulators include lime, alunite, sodium bicarbonate, and hydrochloric acid.
Corrosion inhibitor: Corrosion inhibitor PAPE is used to prevent corrosion of metal pipelines and equipment in water and extend their service life. Common corrosion inhibitors include sodium phosphite, polymer corrosion inhibitors, and organic corrosion inhibitors.
Adsorbent: Adsorbent is used to remove pollutants such as organic matter, odor, chromaticity, and heavy metals from water. Common adsorbents include activated carbon, zeolite, and silica gel.
Chelating agent: Chelating agent is used to form stable complexes with metal ions in water to reduce the impact of metal ions on water quality and equipment. Common chelating agents include EDTA (ethylene diamine tetraacetic acid) and citric acid.
It should be noted that the specific water treatment process and reagent selection may vary depending on the water source, water quality requirements, and the characteristics of the treatment process. Therefore, in practical applications, the selection and use of reagents should be based on water quality testing and engineering needs, combined with the advice of professional personnel.