添加生物基质对地下渗滤系统污水处理效果的影响

Influences of adding bio-substrates to subsurface wastewater infiltration systems on the wastewater treatment effect

构建了以土壤-煤渣分层装填的1#及土壤-煤渣-生物基质分层装填的2#两套地下渗滤系统(SWI)模拟装置,考察生物基质对SWI污水处理效果的影响。水力负荷为10 cm/d时,监测两装置进出水中COD、总磷、氨氮和总氮的变化情况。结果表明:当系统运行稳定后,装置处理效果显著,出水水质均可达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级A标准,1#装置对COD、总磷、氨氮和总氮的去除率分别为89.75%、99.65%、93.66%、74.94%,2#装置分别为92.28%、99.85%、92.78%、84.49%。2#装置对TN的去除率较1#装置要高,添加生物基质可强化系统对TN的脱除能力。

Two sets of simulated apparatuses of a subsurface wastewater infiltration system （SWI） have been establi-shed with different fillers,including Apparatus 1# filled with soil and cinder in layers,and Apparatus 2# filled with soil,cinder and bio-substrate in layers,respectively. The influences of bio-substrates on SWI treatment effects are investigated. When the hydraulic load is 10 cm/d,the changes of COD,TP,NH4＋-N,and TN in inflow and effluent water of the two apparatuses are monitored. The results show that after the system has run steadily ,the treatment effect of the system is remarkable. The water quality of the effluent from both of the apparatuses can reach the First Level A standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants （GB 18918—2002）. The removing rates of COD,TP,NH4＋-N,and TN by Apparatus 1# are 89.75%,99.65%,93.66%,and 74.94%, respectively,while the removing rates by Apparatus 2# are 92.28%,99.85%,92.78%,and 84.49%, respectively. The TN removing rate by Apparatus 2# is higher than those by Apparatus 1# . Adding bio-substrate to SWI can enhance the system removing capacity for TN.