DMBR短程硝化反硝化处理餐厨垃圾厌氧沼液

Treatment of Food Waste Digestate by DMBR with Partial Nitrification and Denitrification

以中空玻璃纤维编织管作为膜组件材料,自行设计制作了一套动态膜生物反应器(DMBR),研究了该装置在短程硝化反硝化条件下对餐厨垃圾厌氧沼液的处理效果。结果表明,通过逐渐提高沼液比例并控制DO浓度为0.8~1.2 mg/L、温度为35℃,可在16 d左右基本实现DMBR短程硝化反应的启动。系统稳定运行阶段,当进水COD和NH+4-N浓度均值分别为6944和650 mg/L、水力停留时间(HRT)为30 h时,COD、NH+4-N和TN去除率分别可达92%、92%和68%,COD和NH_(4)^(+)-N容积负荷分别达到5.13 kg/(m^(3)·d)和0.48 kg/(m^(3)·d),NO_(2)^(-)-N积累率稳定在84%以上、最高值达到90.38%。经处理后,餐厨垃圾厌氧沼液可稳定达到纳管标准,其溶解性微生物代谢产物荧光峰几乎完全被去除,说明该工艺可显著降解甚至完全去除类蛋白物质。

A set of dynamic membrane bioreactor(DMBR)was designed and manufactured with hollow glass fiber braided tube as membrane module,and the treatment effect of the device on food waste digestate under the condition of partial nitrification and denitrification was investigated.Start-up of the partial nitrification of the DMBR could be achieved within about 16 days by gradually increasing the proportion of digestate and controlling the DO concentration between 0.8-1.2 mg/L and the temperature at 35℃.When the average COD and NH_(4)^(+)-N were 6944 mg/L and 650 mg/L,and HRT was 30 h,the removal rates of COD,NH_(4)^(+)-N and TN were 92%,92%and 68%,respectively,and the volumetric loads of COD and NH_(4)^(+)-N were 5.13 kg/(m^(3)·d)and 0.48 kg/(m^(3)·d),respectively.The accumulation rate of NO_(2)^(-)-N was more than 84%,and the highest value was 90.38%.The concentration of the pollutants in the treated food waste digestate could meet the discharge standard for sewage entering into sewer network,and the fluorescence peak of the dissolved microbial metabolites was almost removed completely,which showed that the process could significantly degrade or even completely remove the protein-like substances.