城市景观水系混凝除磷试验研究

Study on the phosphorus removal from landscape water system by coagulation

通过混凝除磷试验考察了不同混凝剂对微污染的校园景观水系中痕量磷的去除效果及其影响因素,同时研究了硫酸亚铁强化混凝对水中不同形态磷的去除效果及聚丙烯酰胺的助凝作用。小试结果表明硫酸亚铁的除磷效果最好,最适投加质量浓度为8 mg/L,最佳pH为7,在投加质量浓度为2 mg/L时就能将水体中各形态的磷有效去除。示范工程运行结果表明,硫酸亚铁处理效果稳定、除磷率高,是经济有效的除磷混凝剂。

Phosphorus removal by coagulation with different coagulants has been studied.The removal effects of different coagulants on the trace phosphorus in the micro-polluted landscape water system in the university campus and their influencing factors are investigated.Meanwhile,the removal effect of enhanced ferrous sulfate on different forms of phosphorus in water and the coagulation aid effect of PAM are studied.The experimental results show that the phosphorus removal effect of ferrous sulfate is the best,with the optimum mass concentration of 8 mg/L and the best pH=7.Different forms of phosphorus in water can be removed effectively when the dosage is only 2 mg/L.The operation results of demonstrative project shows that with stable operating results and high efficiency of phosphorus removal,ferrous sulfate is a kind of economic and effective coagulant for phosphorus removal.