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在原水pH值为6.5～8.5的条件下,采用常规的生活饮用水净化工艺(混凝/沉淀/过滤/消毒),在原水中投加高盐基度(≥85%)的聚氯化铝(PAC)混凝剂,投加量控制在1.0～5.0mg/L(以Al2O3计),控制沉淀水浊度在1.0～3.0 NTU、滤后水浊度≤1.0 NTU,可使净化后饮用水中的残留铝含量在0.05～0.11 mg/L,明显低于《生活饮用水卫生标准》(GB 5749—2006)的铝含量限值(0.2 mg/L),为生活饮用水卫生安全提供了有力保障。另外,与其他铝盐混凝剂相比,采用高盐基度PAC混凝剂净化生活饮用水的药剂成本更低,有利于提高水厂的经济效益和降低居民生活成本。
In the raw water pH value of 6.5 to 8.5 conditions, the use of conventional drinking water purification process (coagulation / sedimentation / filtration / disinfection), in the raw water dosage of high-base (≥ 85%) polyaluminum chloride PAC) coagulant dosage control in 1.0 ~ 5.0mg / L (calculated as Al2O3), control the sediment turbidity in the 1.0 ~ 3.0 NTU, filtered water turbidity ≤ 1.0 NTU, purified drinking water Of the residual aluminum content of 0.05 ~ 0.11 mg / L, significantly lower than the “drinking water health standards” (GB 5749-2006) of the aluminum content limit (0.2 mg / L), for the health and safety of drinking water provides a strong guarantee . In addition, compared with other aluminum salt coagulants, the use of high-salt-based PAC coagulants to purify domestic drinking water is cheaper and helps to improve the economic benefits of waterworks and reduce the living cost of residents.