改良填料对地下渗滤系统污水处理效果研究

Study on the Effect of Improved Packing on the Sewage Treatment of Subsurface Wastewater Infiltration System

为提高SWIS的水力渗透性能和改善系统内部氧化还原环境,组建了3套改良地下渗滤系统,1~#土壤-生物基质,2~#土壤-煤渣-生物基质,3~#土壤-煤渣,在水力负荷10 cm/d运行时,研究填料改良对地下渗滤系统污水处理效果的影响。结果表明,COD、TP、NH_4^+-N和TN的平均去除率,1~#分别为86.31%、99.83%、92.56%和46.78%,2~#分别为88.60%、99.57%、92.83%和79.99%,3~#分别为85.17%、99.84%、93.68%和65.12%。3套装置对COD、TP和NH_4^+-N均有较好的去除效果,平均去除率均超过85%,且2~#装置脱氮效果较为突出,说明煤渣与生物基质分层装填可改善系统内部氧化还原环境,并补充反硝化碳源强化脱氮效果,进而提高地下渗滤系统污水处理效果。

In order to improve the hydraulic permeability of SWlS and the redox environment of SWIS, three sets of the subsurface wastewater infiltration system were set up, which were soil-biological matrix 1^#, soil-cinder-biological matrix 2^# and soil-cinder matrix 3^#, the effect of filler improvement on the sewage treatment efficiency of subsurface wastewater infiltration system was studied when hydraulic loading was 10 cm/d. The results showed that the average removal rates of COD, TP, NH4^＋-N and TN in 1^# were 86.31%, 99.83%, 92.56% and 46.78% respectively, the 2^# were 88.60%, 99.57%, 92.83% and 79.99% and 3^# devices were 85.17%, 99.84%, 93.68% and 65.12% respectively. The three sets of devices had a good removal efficiency of COD, TP and NH4＋-N, the average removal rate was more than 85%, and 2^# device denitrification was more prominent, indicating cinder Layered stratification with biological substrates could improve the internal redox environment of the system, and complement the denitrification carbon source to enhance the denitrification effect so as to improve the sewage treatment effect of the subsurface infiltration system.