Two pilot subsurface wastewater infdtrafion systems （SWISs） were filled with the same mixed matrix and operated in the intermittent feeding mode with hydraulic loading of 0. 1 m3/ （m2 d） for 140 d. One of SWISs w...Two pilot subsurface wastewater infdtrafion systems （SWISs） were filled with the same mixed matrix and operated in the intermittent feeding mode with hydraulic loading of 0. 1 m3/ （m2 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, dogging didn＇t occur in CT system and occurred in ST system. Effluent chemical oxygen demand （COD）, total phosphorus （TP） and ammonia nitrogen （NH4＋ --N ） concentrations in CT system were less than those in ST system. In ST system, effluent COD, TP, NH4＋ --N concentrations increased and suspended solid （SS） concentration decreased after dogging. The results indicated that the use of a prior coagulation treatment was a good alternative for improving the effluent quality and avoiding an anticipated dogging.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 infdtrafion systems （SWISs） were filled with the same mixed matrix and operated in the intermittent feeding mode with hydraulic loading of 0. 1 m3/ （m2 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, dogging didn＇t occur in CT system and occurred in ST system. Effluent chemical oxygen demand （COD）, total phosphorus （TP） and ammonia nitrogen （NH4＋ --N ） concentrations in CT system were less than those in ST system. In ST system, effluent COD, TP, NH4＋ --N concentrations increased and suspended solid （SS） concentration decreased after dogging. The results indicated that the use of a prior coagulation treatment was a good alternative for improving the effluent quality and avoiding an anticipated dogging.
