摘要
针对微山湖源水pH季节性变化的水质特征,对自来水厂处理过程中残余铝的影响因素进行了系统研究,确定了采用不同铝盐混凝剂对不同pH条件下残余铝的有效控制措施。研究结果表明:夏季原水pH值<7.5,使用传统PAC作为混凝剂时,出厂水残余铝浓度可以控制在0.17 mg/L以下;当原水pH值>8.1,使用PAC混凝时,出厂水残余铝浓度接近限值0.20mg/L,而使用AlCl_3·6H_2O、Al_2(SO_4)_3·18H_2O作为应急混凝剂,出厂水pH值可以降到7.6,残余铝浓度为0.15 mg/L,低于0.20 mg/L的饮用水标准要求。研究结果可供有相似水源的自来水厂参考。
Aiming at the seasonal pH variation of raw water from Weishan Lake, influence factors of residual aluminum in the water treatment process was studied systematically, and effective control methods of residual aluminum were determined, which different aluminum salt coagulants were used under different pH conditions. The results showed that traditional PAC was used as coagulant when pH value of raw water was less than 7. 5 in summer, residual aluminum could be controlled below 0. 17 mg/L. PAC was used as coagulation that residual aluminum concentration in the effluent was close to the limit value of 0. 20 mg/L when pH value of raw water was more than 8. 1, but the pilot experiment found that AlCl_3·6 H_2O and Al_2(SO_4)_3 · 18 H_2O was used as emergent coagulant, and pH value of effluent could be reduced to 7. 6. Also,residual aluminum was 0. 15 mg/L,which was lower than 0. 20 mg/L required by drinking water standard. The results would be used as reference in similar water source waterworks.
引文
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