不同化学试剂对富营养化水体去磷效果的比较

A Comparative Study on the Effects of Different Chemical Reagents on Remove of Phosphorus from Eutrophic Water

为探索控制水华爆发的方法,本实验以荆州市东门护城河水为实验对象,用三氯化铝、三氯化铁和氢氧化钙对其进行处理,研究了三种絮凝剂的投加量对总磷处理效果的影响,并比较了不同温度下各种絮凝剂的絮凝效果。结果表明:氢氧化钙在投加量为205.9 mg/L时达到最佳效果,最佳反应pH在11.3,最佳反应温度为27℃;三氯化铝在投加量为58.3 mg/L时达到最佳效果,最佳反应pH在6.9,最佳反应温度为30℃;三氯化铁在投加量为43.1 mg/L时达到最佳效果,最佳反应pH为7.1,最佳反应温度为27℃。结论:在实际应用时根据不同的气温条件,采用氢氧化钙和三氯化铁单独或配合使用能达到较好的控制水华的效果。

The paper is aimed to find out a method to control water bloom.The water which is from the moat of East Gate of Jingzhou City was used in the experiment.And aluminum chloride,ferric chloride and calcium hydroxide have been selected to deal with the water samples.The effects of three flocculating agents on remove of phosphorus were studied and a comparative study on the effect of different flocculating agents on the flocculation in different temperatures was made.The results were shown that the best dosage of calcium hydroxide was 205.9 mg/L,the best responsible pH was 11.3,and the best temperature was 27 ℃.but for aluminum chloride the best dosage was 58.3 mg/ L,the best responsible pH was 6.9,the best temperature was 30 ℃,for the ferric chloride,the best dosage was 43.1 mg/L,the best responsible pH was 7.1,and the best responsible temperature was 27 ℃.We can get a better effect of controlling water bloom using calcium hydroxide and ferric chloride singly or multiply according to the temperature.