摘要
为探究混凝法处理城市降雨地表径流污染物的有效性及可行性,采用混凝烧杯试验,研究径流污染物浓度、混凝剂类型[聚合硫酸铝(PAS)、聚合氯化铝(PAC)、聚合硫酸铁(PFS)、聚合氯化铁(PFC)、聚合氯化铝铁(PAFC)]、混凝剂投加量(13、17、26、35、44 mg/L)对混凝法削减径流污染物的影响。结果表明,混凝法对低、中、高3种污染物浓度水平的雨水径流污染物削减作用如下:浊度的平均削减率分别为77.48%、77.82%、58.38%,COD_(cr)的平均去除率分别为77.92%、65.30%、32.46%,TN的削减率分别是52.23%、23.39%、38.35%,TP的削减率分别是60.91%、59.64%、66.02%,随着混凝剂投加量的增加混凝法对浊度的削减率逐渐提高,不同混凝剂对COD_(cr)、TN、TP的削减率随投加量的变化差异显著。PFC对浊度、COD_(cr)及TP的综合平均削减率均高于另外4种混凝剂,对于低浓度TN的去除率,PAFC要明显优于其他混凝剂,而PFS受污染物TN浓度的影响较小,削减率稳定,抗负荷冲击能力强。此方法可应用于城市雨水径流面源污染控制。
In order to explore the effectiveness and feasibility of coagulation method on removing urban rainfall-runoff pollutants,the beaker test of coagulation is adopted to study the effects of runoff pollution concentration,coagulant types[(polyalumi rlillm sulfate(PAS),polyaluminium chloride(PAC),polymeric ferric sulfate(PFS),polyferric chloride(PFC),poly aluminum ferric chloride(PAFC))]and coagulant dosage(13,17,26,35 and 44 mg/L)on reducing runoff pollutants by coagulation method.The results indicate that coagulation method has a good ability to reduce three stormwater runoff pollution concentrations:the pollution reduction rates of turbidity,COD_(cr),TN and TP by coagulation method reach to 77.48%,77.82%and 58.38%;77.92%,65.30%and 32.46%;52.23%,23.39%and 38.35%;60.91%,59.64%and 66.02%respectively.With the increase of coagulant dosage,the turbidity reduction rate of coagulation method shows a gradually increasing trend.The difference in the reduction rate of turbidity,COD_(cr),TN and TP by coagulation method is significant with the chang of coagulant dosage.The reduction rate of turbidity,COD_(cr)and TP of PFC is greater than that of the other four coagulants.For the removal rate of TN of low pollution concentration level,PAFC is superior to other coagulants.The reduction rate of TN of PFS is affected less by the pollution concentration level,which is stable,and has a lot of resistance to the load impact.The coagulation method can be used to control the non-point source pollution of urban stormwater runoff.
作者
乐俐
Yue Li(Tianjin Cement Industry Design&Research Institute Co.,Ltd,Tianjin 300400,China)
出处
《黑龙江科学》
2023年第14期56-60,共5页
Heilongjiang Science
基金
国家水体污染控制与治理科技重大专项(2009ZX07314-002-01)。
关键词
混凝法
雨水径流
面源污染
削减
Coagulation method
Stormwater runoff
Non-point source pollution
Reduction
