生物活性炭去除垃圾渗滤液中难降解有机物

Remove Refractory Organics from Landfill Leachate using Biological Activated Carbon

对比SBR和生物活性炭(biological activated carbon,BAC)处理垃圾渗滤液效果,COD去除率分别稳定在10%和25%左右,表明BAC可以去除部分难降解有机物.原位测定SBR和BAC反应器1个运行周期生物降解有机物二氧化碳(CO2)产生量分别为109和306mg,BAC比SBR生物分解有机物量多,表明BAC可以生物分解部分难降解有机物.采用Freundlich方程拟合新活性炭,生物再生活性炭和吸附饱和活性炭的吸附等温线,1/n值分别为2.56,2.94和19.05,表明新活性炭吸附能力最强,生物再生活性炭次之,吸附饱和活性炭最差,生物再生使活性炭的吸附能力得到较好的恢复,证明了生物再生现象的存在.进一步分析认为吸附延长了有机物在反应器内的停留时间,提高了生物分解量.生物再生是BAC去除难降解有机物的本质原因.

COD removal effect of landfill leachate was compared using biological activated carbon （BAC） reactors and SBR treatment. COD removal efficiency was stable at around 10% and 25 %. It showed that BAC can remove part of refractory organics. The output of carbon dioxide in reactors was 109 and 306 mg. The quantity of biological decomposition of organic matter in BAC was more than SBR, indicating that BAC could partially biodegrade refractory organics. The adsorption isotherms of activated carbon, activated carbon of adsorption saturated and biological regeneration activated carbon was compared. And fitted by Freundlich equation, 1/n values were 2.56, 2.94 and 19.05, respectively. It was clearly showed that the strongest adsorption was new activated carbon, biological regeneration activated carbon was the second, and activated carbon adsorption saturation was the worst. It proved the existence of bioregeneration. Further analysis indicated that extending the organics residence time in the reactor,improved the amount of biological decomposition. Bioregeneration is the essential reason of refractory organics decomposed by BAC.