改性硅藻土对城市污水的深度处理

Advanced Treatment of Municipal Wastewater Using Modified Diatomite

采用天然和改性硅藻土对污水处理厂二级处理出水进行深度处理的实验研究,考察了天然硅藻土处理水样时,搅拌时间、投加量和动静态实验对去除效率的影响,并分析了硅藻土改性前后对水样的去除效率和出水水质.结果表明:天然硅藻土处理水样,搅拌时间30min,投加量300 mg/L时,能取得较好的处理效果,出水水质满足排放标准的一级B标准；相同条件下,投加改性硅藻土,去除效率优于天然硅藻土,去除率提高了20％ ～ 40％,其处理后出水能够达到排放标准的一级A标准,能够满足回用的基本要求.

The feasibility of using raw and modified diatomite for advanced treatment of secondary sewage effluents is investigated in this study.The influences of the stirring time,the diatomite amount and different reactor on treatment effect are studied.Water quality after treatment with raw diatomite and modified diatomite is also discussed.It is shown that,under conditions of the stirring time set at 30 mins and 300 mg/L of the dosage,the maximum removal rate with the raw diatomite can be achieved and the effluent is suitable for the level B discharge standards.Under the same conditions,modified diatomite is thus considered much better than raw diatomite,it has 20%~40% higher removal rate for the effective treatment of secondary sewage effluents and the effluent with modified diatomite can meet the level A discharge standards,which can be reused.