三段序列间歇式活性污泥法中间氧化吸附处理垃圾渗滤液试验研究

Treatment of landfill leachate by three-stage SBR process and mid-oxidation with adsorption

采用厌氧、好氧2个反应器三段SBR工艺,中间通过投加臭氧来氧化部分有机物处理垃圾渗滤液。在COD质量浓度为3013mg/L,BOD质量浓度为1298mg/L,NH4+-N质量浓度为195mg/L,TN质量浓度为272mg/L,厌氧、兼氧及好氧停留时间分别为24、3h和1h,没有中间氧化的情况下,COD、BOD、NH4+-N、TN的去除率分别为97.3%、97.8%、91.3%、92.1%。厌氧出水投加30mg/L臭氧中间氧化的情况下,各指标的去除率分别为96.7%、97.1%、87.7%、92.8%。在臭氧中间氧化后进入兼氧之前投加20mg/L粉末活性炭后,各指标的去除率可以达到98.5%、99.3%、94.6%、94.7%。臭氧和粉末炭的同时投加有利于对COD和NH4+-N的去除。粉末活性炭的投加一方面可以吸附部分有机物,另一方面可以消除臭氧对后续工艺的影响。

A process of three-stage SBR process in two reactors with mid-oxidation by ozone is used for the treatment of landfill leachate. When COD of landfill leachate is 3 013 mg/L, BOD, 1 298 mg/L, NH4^＋ -NR, 195 mg/L, TN, 272 mg/L, the removal rates of COD, BOD, NH4^＋-N and TN are 97.3%, 97.8%, 91.3%, 92.1% without the mid-oxidation, when the hydraulic retention times of anaerobic stage, anoxic stage and oxic stage are 24h, 3h and 1h, respectively. With 30 mg/L of ozone dosed in the outlet of anaerobic SBR, the total removal of COD, BOD, NH4^＋ -N and TN are 96.7% ,97.1% ,87.7%, 92.8 %. 20 mg/L of powder activated carbon（PAC） dosed can increase the removal of COD, BOD, NH4^＋ -N and TN to 98.5 %, 99.3% ,94.6% ,94.7%, respectively. PAC can remove some organisms in water and decrease the effect of ozone on the following oxic process.