高pH湖泊水处理中残余铝的影响因素及控制措施
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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.
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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[2]祁嘉义.临床元素化学[M].北京:化学工业出版社,2000.
[3]高雅,毕哲,王东升,等.优化混凝处理低温低浊黄河水及对余铝的控制[J].环境工程学报,2013(10):3737-3742.
[4]蒋绍阶,梁建军.净水中残余铝的危害与控制[J].重庆建筑大学学报,1992,21(6):27-30.
[5]朱灵峰,田艳娥,黄豆豆,等.高碱度水混凝过程中残余铝控制影响因素的研究[J].河南工业大学学报,2013,47(2):197-201.
[6]张振杰,侯煜堃,陈浩,等.南水北调水混凝过程中残余铝控制的影响试验研究[J].供水技术,2016,10(6):1-5.
[7]肖定华.降低饮用水中残余铝的中试研究[J].供水技术,2011(4):14-17.
[8]李润生,金立新,李凯,等.高盐基度PAC降低饮用水中残留铝的研究[J].中国给水排水,2013,29(7):52-55.
[9]张振杰,侯煜堃,陈浩,等.水解聚合铝溶液中形态分布的定量模拟研究[J].环境科学学报,1995,15(1):39-47.
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