making process of instead alum use high purity poly aluminium chloride coagulant

making process of instead alum use high purity poly aluminium chloride coagulant
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  • What is high-purity poly-aluminum chloride (PACL)?
  • Poly-aluminum chloride (PACl) is one of the common coagulants for water and wastewater treatment. A new Chinese national standard of PACl has been implemented, where the concentration of insoluble substances, iron and heavy metals is to be controlled strictly, then researches on the preparation of high-purity PACl are needed.
  • Is polyaluminum chloride a good coagulant for water treatment?
  • Polyaluminum chloride (PAC) is highly effective coagulant for water treatment over conventional coagulants because of low dosage requirement, shorter flocculation time, smaller amount of sludge, high efficiency and low aluminum residual in treated water [ 6 ].
  • What is the coagulation time for aluminum sulfate and aluminum chloride coagulants?
  • However, for aluminum sulfate and aluminum chloride coagulants the coagulation time and settling time were reached to 15 and 35 min, respectively. The results revealed that the residual aluminum concentration in the treated water was very small for synthesized PAC coagulant which was <0.2 mg L −1.
  • Do aluminum coagulants with iron improve coagulation performance?
  • For example, iron content is relatively high; there are certain iron (0.1–3%) remained in the resulting PACl products. It has been known that aluminum coagulants with iron usually boost the coagulation performance, however, in some specific fields, there are strict restrictions for the iron content.