UASB-A/O-ASBR工艺实现晚期垃圾渗滤液深度除碳脱氮

针对晚期垃圾渗滤液实现深度除碳脱氮,采用上流式厌氧污泥床(upflow anaerobic sludge blanket,UASB)-缺氧/好氧反应器(anoxic/aerobic reactor,A/O)-厌氧氨氧化反应器(anaerobic sequencing batch reactor,ASBR)组合工艺,以短程硝化-厌氧氨氧化耦合反应为依托,通过UASB实现有机物的大部分降解,在A/O中实现短程硝化,在ASBR中通过厌氧氨氧化深度脱氮.研究结果表明:当进水ρ(CODcr)、ρ(NH_4~+-N)和ρ(TN)分别为2 220 mg/L、1 400~1 450 mg/L和1 450~1 500 mg/L;最终出水分别为98、7、25 mg/L,实现了分别为95.6%、98.3%和99.5%的高去除率.故该工艺无须投加任何外碳源,最终实现化学需氧量(chemical oxygen demand,COD)、氨氮(NH_4~+-N)和总氮(total nitrogen,TN)的高效、深度去除.

Advanced Removal Nitrogen and Carbon of Landfill Leachate by the UASB-A/O-ASBR Process

In order to implement deep removal of carbon and nitrogen from the mature landfill leachate, the combined process, which consists of an upflow anaerobic sludge blanket ( UASB) , an anoxic/aerobic reactor ( A/O) and anaerobic sequencing batch reactor ( ASBR) was used for landfill leachate treatment. Based on the coupling partial nitrification and anaerobic ammonium oxidation reaction, most of the organic compounds were degraded by UASB. The partial nitrification was achieved in A/O reactor. Deep nitrogen removal was carried out by anaerobic ammonium oxidation in ASBR. Results show that when the influent concentration of p(CODcr), p(NH4+-N) and p(TN) are 2220, 1400-1450 and 1450-1500 mg/L, the final effluent is 98, 7 and 25 mg/L with a total removal efficiencies of 95. 6%, 98. 3% and 99. 5%, respectively. Efficient removal of COD, ammonia nitrogen ( NH4+-N) and total nitrogen ( TN) is achieved by the process without the need of any external carbon source.