Two pilot subsurface wastewater infiltration systems(SWISs) were filled with the same mixed matrix and operated in the intermittent feeding mode with hydraulic loading of 0.1 m^3/(m^2·d) for 140 d.One of SWISs wa...Two pilot subsurface wastewater infiltration systems(SWISs) were filled with the same mixed matrix and operated in the intermittent feeding mode with hydraulic loading of 0.1 m^3/(m^2·d) for 140 d.One of SWISs was fed with wastewater which was previously settled(ST),and the other with the same wastewater but in addition treated with a coagulation process(CT).After 140 d of operation,in the upper layer of ST system the effective porosity decreased by 4.1%and the organic matter(OM) content increased by 246.4%,whereas only decreased by 0.7%and increased by 35.7%of CT system,respectively.During the study,clogging didn't occur in CT system and occurred in ST system.Effluent chemical oxygen demand(COD),total phosphorus(TP) and ammonia nitrogen(NH_4^+ —N) concentrations in CT system were less than those in ST system.In ST system,effluent COD,TP,NH_4^+—N concentrations increased and suspended solid(SS) concentration decreased after clogging.The results indicated that the use of a prior coagulation treatment was a good alternative for improving the effluent quality and avoiding an anticipated clogging.展开更多
基金National Natural Science Foundations of China(Nos.41001321,41471394,41571455)Major Original Program in Shenyang Normal University,China(No.ZD201403)+2 种基金Ecology and Environment Research Center Director Foundation of Shenyang Normal University,China(No.EERC-T-201601)Natural Science Foundation of Liaoning Province,China(NO.2015010585-301)Liaoning BaiQianWan Talents Program,China(No.2015(45)
文摘Two pilot subsurface wastewater infiltration systems(SWISs) were filled with the same mixed matrix and operated in the intermittent feeding mode with hydraulic loading of 0.1 m^3/(m^2·d) for 140 d.One of SWISs was fed with wastewater which was previously settled(ST),and the other with the same wastewater but in addition treated with a coagulation process(CT).After 140 d of operation,in the upper layer of ST system the effective porosity decreased by 4.1%and the organic matter(OM) content increased by 246.4%,whereas only decreased by 0.7%and increased by 35.7%of CT system,respectively.During the study,clogging didn't occur in CT system and occurred in ST system.Effluent chemical oxygen demand(COD),total phosphorus(TP) and ammonia nitrogen(NH_4^+ —N) concentrations in CT system were less than those in ST system.In ST system,effluent COD,TP,NH_4^+—N concentrations increased and suspended solid(SS) concentration decreased after clogging.The results indicated that the use of a prior coagulation treatment was a good alternative for improving the effluent quality and avoiding an anticipated clogging.
