摘要
用沸石、活性炭和粘土陶粒3种基质按照不同的含量和组合方式构建了4组地下渗滤系统模拟装置,其中柱1和柱2采用分层装填方式,柱3和柱4则采用完全混合装填方式;柱1和柱3中沸石、活性炭和粘土陶粒的体积比为3∶2∶2,在柱2和柱4中体积比为8∶3∶3。实验采用人工配制的生活污水,进水中CODCr、TN和NH4＋-N的浓度分别为280.6-329.8 mg/L、18.9-23.7 mg/L和15.1-19.5 mg/L。通过监测CODCr、TN和NH4＋-N的浓度变化,研究不同水力负荷对污染物去除效果的影响。结果表明：污染物的去除与水力负荷呈负相关。当水力负荷在0.1-0.3 m^3/（m^2·d）时,系统对污染物净化效果较好,出水均能满足《城镇污水处理厂污染物排放标准》二级标准;当水力负荷为0.4 m^3/（m^2·d）时,系统对污染物的去除效果与0.1 m^3/（m^2·d）时相比显著下降,其中CODCr和TN与之前相比均有10%-20%的下降,分层装填的系统净化效果下降尤为明显。因此,在实际工程中推荐使用混合装填方式,并在保证出水水质的情况下尽可能采用较大的水力负荷,以提高系统的处理性能。
In this study, 4 subsurface infiltration systems were built with zeolite, activated carbon and clay ceramsite in different contents and combinations. Column 1 and 2 were filled in a layered mode, whereas column 3 and 4 were filled in a mixed mode. The volume ratios of zeolite, activated carbon and clay ceramsite in 4 columns were 3∶2∶2, 8∶3∶3, 3∶2∶2and 8∶3∶3, respectively. Artificial domestic wastewater was used in the experiments, and the concentrations of CODCr,total nitrogen（TN） and NH4＋-N in the influent were 280.6 - 329.8 mg/L, 18.9 - 23.7 mg/L and 15.1 - 19.5mg/L,respectively. The concentrations of pollutants in the effluent were monitored to study pollutant removal efficiency under different hydraulic loading rates. The result showed that the hydraulic loading rate caused a negative influence on pollutant removal. When the hydraulic loading rates were between 0.1 and 0.3 m^3/（m^2·d）, the subsurface infiltration systems had a good purified effect, and effluent could meet the second standard of ＂urban sewage treatment plant emission standards＂. However, the treatment effect decreased significantly when the hydraulic loading rate increased to 0.4 m^3/（m^2·d）. Compared with the hydraulic loading rate of 0.1 m^3/（m^2·d）, the removal rate of CODCrand TN were decreased by 10% - 20%, especially in the column with layered packing mode. Therefore, the mixed filling mode is recommended in the actual project, and the higher hydraulic loading rate can be adopted to improve the capacity of the system if the water quality is qualified.
出处
《城市环境与城市生态》
CAS
2015年第2期43-46,共4页
Urban Environment & Urban Ecology
基金
徒骇河
马颊河流域水污染防治与水质改善技术集成与综合示范--基于河流水质改善的流域村镇生活污水处理及资源化利用关键技术研究(2012ZX07203-004-07)
大沽河综合整治技术对策及管理方法研究(JK2012-22)
关键词
水力负荷
改良式地下渗滤系统
农村生活污水
hydraulic loading rate
modified subsurface soil infiltration system
rural domestic wastewater
