碳源对晚期垃圾渗滤液短程硝化的影响

Effect of Carbon Source on the Short-cut Nitrification of the Mature Municipal Landfill Leachate

为了考察碳源对晚期垃圾渗滤液短程硝化的影响,采用"两级UASB-缺氧-好氧系统"处理城市生活垃圾晚期渗滤液.系统进水COD质量浓度为4.3g/L左右,进水氨氮质量浓度为2.8 g/L,故COD与氨氮质量浓度之比很低,为1.5左右.首先在UASB1中实现同时反硝化与产甲烷反应,一部分COD在UASB2中进一步去除,在A/O反应器中利用残余COD进行反硝化以及NH_4^+-N的彻底硝化.试验结果表明,未投外加碳源时,原水中可降解COD几乎全部作为一级UASB的反硝化碳源被利用,A/O池缺氧段反硝化碳源不足.在A/O池的A段投加相当于1 g/L COD质量浓度的无水乙酸钠作为电子供体促进反硝化后,由于反硝化产生大量的碱度,补充了硝化所消耗的碱度,使pH值维持在一个比较合适的范围,可实现稳定的短程硝化,亚硝态氮累积率由未投加碳源时的20%提高到87%,系统出水氨氮质量浓度为0.01 g/L左右,氨氮的去除率也由未投加碳源时的92%提高到99.6%.

A system consisted of two-stage UASB-Anoxic/Oxic reactor(A/O)was used to study the short-cut nitrification of the mature municipal landfill leachate with low COD and high ammonia concentration.The COD concentration of influent leachate was 4.3 g/L,and the ammonia concentration of influent leachate was 2.8 g/L,so the ratio of C/N was only 1.5.The uasbl methane production and the denitrification happened at the same time.The concentration of uasbl effluent COD was removed further in the uasb 2.Then nitrificat...