The influence of chloride and alkalinity on the release of heavy metal manganese in the drinking water network
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Abstract:
Static release experiments were designed to investigate the effect of different chloride concentrations and alkalinity of source water on manganese release in drinking water distribution systems. We sampled pipe scale from the drinking water network of Zhengzhou and prepared experiment water with different concentrations of chloride ( 5mg/L, 23.1mg/L, 60mg/L, 90mg/L) and alkalinity ( 52.5mg/L, 125mg/L, 200mg/L) . A reactor was designed for simulating manganese release. We analyzed the effect of chloride and a lkalinity concentration changes on the manganese release of water pipe scale. The results indicated that the chloride concentration and alkalinity were highly correlated with the manganese release in drinking water network. Chloride was the primary factor affecting the manganese release of water pipe scale. In this experiment, when the concentration of chloride was 30mg/L, with a residence time of 60 hours, the manganese release reached the maximum of 108mg/L, and then the release became steady . Under the condition that the concentration of chloride promoted manganese release, the alkalinity and the manganese release of pipe scale showed an obvious correlation. The results of the experiment can provide a reference for studying manganese release in drinking water distribution systems after water source switching .
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