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夏季同一时期3种长江原水浊度和氨氮较低,中央沙库区原水藻类和高锰酸盐指数较高。有机物图谱分析表明,3种原水中多以苯系物、酞酸酯类等小分子有机物为主,浓度均比较低。混凝剂硫酸铝、聚硫氯化铝和聚合硫酸铝铁对于同种原水浊度的去除效果比较接近,其中聚合硫酸铝铁略好。对于陈行水库原水和青草沙库区原水,硫酸铝的最佳投量为30 mg/L,对于中央沙库区原水,在增加硫酸铝投量或改变混凝剂种类的情况下均难以达到良好的混凝效果,而预加氯工艺可有效改善其混凝效果,提高高锰酸盐指数的去除率。
In the same period of summer, the turbidity and ammonia nitrogen of three kinds of Yangtze River raw water were lower, and the raw water algae and permanganate index in the central sand bank were higher. The analysis of organic compounds showed that most of the three kinds of raw water mainly consisted of small molecule organic substances such as benzene series and phthalate esters, with relatively low concentrations. The coagulant aluminum sulphate, polyaluminum sulphide and polymerized ferric sulphate are close to the removal of the same kind of raw water turbidity, of which the polymerized ferric sulphate is slightly better. For the raw water of Chenhang reservoir and raw water of Qingcaosha reservoir, the optimum dosage of aluminum sulfate is 30 mg / L, which is hard to reach for the raw water in the central sand reservoir with increasing dosage of aluminum sulfate or changing the type of coagulant Good coagulation effect, and pre-chlorination process can effectively improve the coagulation effect and improve the removal rate of permanganate index.