MBBR—MBR组合工艺处理生活垃圾沥滤液的研究

Treatment of leachate from a domestic waste incineration plant by MBBR-MBR combined process

室温下,采用缺氧/两级好氧MBBR—MBR组合工艺对厌氧处理后的垃圾焚烧厂沥滤液进行处理。实验结果表明:在进水pH约为7、进水流量1.0 L/d和总回流比400%的条件下,即使沥滤液的NH4+-N高约1 650 mg/L、COD约为6 500 mg/L时,组合工艺对COD、NH4+-N、TN的去除率仍达到80%、99%、81%左右,出水NH4+-N<15mg/L,该工艺能实现对高浓度NH4+-N的有效去除。另外,二级好氧MBBR和MBR中的亚硝氮积累率分别达到90%、80%左右。这两个反应器中亚硝酸菌的数量远多于硝酸菌。

A lab-scale combined process comprised of the moving bed biofilm reactor （MBBR） and the membrane biological reactor （MBR） has been used for treating the leachate from a municipal solid waste incineration plant, after being treated by anaerobic process. The results show that the combined process is effective when the influent pH is about 7 ,influent flow 1.0 L/d,and total reflux ratio 400%, and even when the NH4＋-N of the leachate is around 1 650 mg/L and COD 6 500 rag/L, the removing rates of COD, NH4＋-N and TN can still reach about 80%, 99% and 81% ,respectively. The effluent NH4＋-N is less than 15 mg/L. It indicates that this process can effectively remove highly concentrated NH4＋-N. Furthermore, short-cut nitrification with about 90% and 80% of nitrite accumu- lation takes place in the second stage of aerobic MBBR （MBBR2） and the MBR. The amount of nitrite bateria is much more than that of the nitrate bacteria in both of the MBBR2 and MBR.