聚硅酸铝絮凝处理医院污水

以聚硅酸铝为混凝剂,用化学法絮凝处理医院污水,并用二氧化氯杀菌。考查了pH、加入混凝剂的体积、搅拌速度、搅拌时间、沉降时间等条件对CODCr去除率的影响。结果表明,在pH为7.7时,每100 mL污水中聚硅酸铝的体积为0.2 mL,搅拌速度为60 r/min,搅拌时间为25 s,沉降20 min后,CODCr去除率可达88%左右,经二氧化氯杀菌后污水水质达到国家二级排放标准,可直接排放,不会对环境造成污染,明显优于传统的铁系混凝剂的处理效果。聚硅酸铝原料来源广泛,价格低廉,水处理成本仅为0.30元/t,有实际应用的价值。

Treatment of Hospital Waste Water With Polysilicate Aluminum

Hospital waste water was treated with polysilicate aluminum as coagulant,and using chlorine dioxide to kill bacteria.Conditional experiments were investigated about influence of pH,volume of coagulant,mixing speed,mixing time and sedimentation time to the removal rate of COD_(Cr).The results show that the removal rate of COD_(Cr) can reach 88% under the conditions of pH 7.7,0.2 mL flocculation agent per 100 mL waste water,60 r/min mixing speed,25 s mixing time and 20 min sedimentation time.Water quality can reach the 2nd standard to drain off water in China after killing bacteria with cholorine dioxide.It can be drained off directly without pollution.It is more perfect than traditional Fe-family coagulant.The raw materials of polysilicate aluminum are abundant and inexpensive.The cost of the waste water treatment is only 0.30 Yuan/t.The practical application of polysilicate aluminum is advisable.