回流对陈垃圾生物反应器处理老年渗滤液污染物影响

Effects of Recirculation on Mature Landfill Leachate

为了研究回流对陈垃圾反应器处理老年渗滤液污染物的影响,构建了回流的陈垃圾生物反应器,试验了不同温度、负荷和回流比条件下反应器对污染物的去除效果。结果表明,在较低水力负荷12.8~25.5 L/(d.m2)的情况下,陈垃圾反应器对NH3-N、BOD5和COD等污染物的去除率分别达到90%、95%和70%以上。在不同温度下提高水力负荷,回流会抑制氨氮和COD的去除,但可显著提高TN的去除率,表明回流可作为提高老年渗滤液TN去除率的途径之一。利用氮同位素示踪技术发现反应器中有Anammox脱氮途径存在。但是可利用碳源的缺乏仍是提高老年渗滤液脱氮效率的限制因子。

A laboratory scale bioreactor with a recirculation system was developed to simulate treating aged refuse from a landfill in Shanghai. Study with bioreactor focused on its removal of the pollutants in leachate in terms of NH^-N, BOD and COD with various recirculation ratios and under different temperatures and loadings. The findings revealed that by increasing hydraulic loading it would be possible to significantly improve removal of total nitrogen （TN）though removal efficiencies of COD and NH3-N could be inhibited, thus indicating recirculation would be an approach to upgrading TN-removing of a mature landfill leachate. However scarcity of carbon source in mature leachate is still a limiting factor for nitrogen removal.