复合混凝剂去除湖泊水中磷的研究

Study on Removal of Phosphorus from Lake Water by Compound Coagulant

研究了PAC(聚合氯化铝)和PFS(聚合硫酸铁)两种无机高分子混凝剂对奉心湖水总磷的混凝效果;通过采用PAC与PFS不同比例混合剂配比后,探究了适用于奉心湖水中磷的无机高分子混凝剂的配比与沉淀时间,在PAC∶PFC=2∶1的混凝剂配比下除磷效果最佳,最佳用量为60mg/L,最佳沉淀时间为35min,最佳水力条件为:快搅拌速度400r/min,时间1 min;慢搅拌速度100r/min,时间6 min;除磷效率高达86.67%,TP浓度由0.052 mg/L降至0.022mg/L,通过预处理后湖水水质达到Ⅱ类地表水水质控制要求。

The coagulation effect of two inorganic polymer coagulants,PAC(Poly Aluminum Chloride)and PFS(Poly Ferric Sulfate)on the total phosphorus in Fengxin Lake water was studied.Through the use of different ratios of PAC and PFS mixtures,the ratio and precipitation time of the inorganic polymer coagulant suitable for phosphorus in Fengxin Lake water were determined.The phosphorus removal effect is the best under the coagulant ratio of PAC∶PFC=2∶1,and the best dosage is 60 mg/L,the best precipitation time is 35 min,the best hydraulic conditions were:fast stirring speed is400 r/min,time 1 min;slow stirring speed is 100 r/min,time is 6 min.Phosphorus removal efficiency is as high as86.67%,the concentration of TP was reduced from 0.052 mg/L to 0.022 mg/L.After pretreatment,the lake water quality reached Class II surface water quality control requirements.