给水厂铝超标的影响因素与调控措施

Influencing Factors and Control Measures of Excessive Aluminum in Water Supply Plant

研究了山东地区引黄水库水水厂存在的季节性铝超标问题。结果表明,出厂水中铝主要来自进水所含及铝盐混凝剂引入,出厂水铝超标的主要原因为进水pH变化造成的混凝效果不佳导致的溶解性铝过量。当进水pH小于8.2时,现用的聚合氯化铝不会造成出厂水铝超标;当pH在8.2~8.4时,更换为铁盐混凝剂可取得较高的效果,其中聚合硫酸铁具有更佳的pH适应性;当pH大于8.4时,先降低进水pH才能取得有效的调控效果。采用聚合氯化铝铁有效地解决了水厂铝超标问题,为引黄水库水水厂出厂水的铝含量保障提供了技术支持。

The problem of seasonal excessive aluminum existed in water supply plants of reservoir water from Yellow River Water Diversion in Shandong area was studied. The results showed that, the aluminum in the factory water mainly came from the influent water and the introduction of aluminum salt coagulant, the main reason for the excessive aluminum in the factory water was the excessive amount of soluble aluminum caused by the poor coagulation effect due to the change of influent pH. When the pH of influent was less than 8.2, polyaluminium chloride would not cause aluminum exceeded in the factory water;when the pH was 8.2~8.4, Fe-based coagulant could achieve better effect, of which the polyferric sulfate was the best pH adaptability;when the pH was higher than 8.4, only by reducing the pH could achieve effective control effect. The use of polyaluminum ferric chloride effectively solved the problem of excessive aluminum in water plants, and provides technical support for ensuring the aluminum content of the factory water in the water plant of the Yellow River Diversion Reservoir.