回灌型准好氧填埋场脱氮特性及加速稳定化研究

采用2个模拟填埋生物反应器,1号柱渗滤液简单回灌,2号柱为渗滤液回灌准好氧联合运行方式,研究了渗滤液回灌准好氧生物反应器填埋场的脱氮特性及加速垃圾稳定化特性.研究结果表明:渗滤液回灌准好氧填埋场具有很强的脱氮能力,2号柱由厌氧运行方式改为准好氧条件下,渗滤液中的氨氮和凯式氮浓度分别由最大值的3 198 mg/L和3 345 mg/L降低到第160 d的73 mg/L和81 mg/L,去除率分别为97.7%和97.6%,pH快速升高到8.0左右,COD浓度快速降低.渗滤液中溶解性有机物(DOM)分级结果表明,2号柱HA和FA含量的增加明显快于1号柱.2号柱DOM的三维荧光光谱特性发生了较大变化,荧光基团从60 d结构简单的类蛋白物质转变为95 d结构复杂的类胡敏酸和富里酸物质,而l号柱渗滤液DOM荧光基团一直是结构简单的类蛋白物质.结果表明回灌准好氧生物反应器填埋场的稳定化速度远快于简单回灌的生物反应器填埋场.

Nitrogen removal and accelerating the stabilization of waste in recirculated semi-aerobic bioreactor landfills

Two simulated landfill bioreactors were established, in which column 1 was leachate recirculated only, column 2 was operated by leachate recirculated combining with semi aerobic. The removal rate of ammonia nitrogen and accelerating the stabilization process of waste in bioreactor landfill were investigated. Results demonstrated that there was strong nitrogen removal ability in the semi-aerobic bioreactor landfill. When the operation mode was changed from anaerobic mode to semi-aerobic mode in the 60th day, the ammonia nitrogen and Kjeldahl nitrogen concentration was respectively dropped from 3 198 mg/L and 3 345 mg/L to 73 mg/L and 81 mg/L at 160 days. The removal rate respectively was 97.7% ang 97.6%. pH was increased to about 8.0 and COD concentration of simulated bioreactor landfill column 2 was dropped quickly. The results of DOM fractionation showed that the content of humic acid (HA) and fulvic-acid (FA) from column 2 leachates increased more fast than those of column 1.The three-dimensional excitation-emission matrix fluorescence spectroscopy (3DEEM) characteristic of dissolved organic matter(DOM) changed greatly, and fluorescence peak changed from protein-like fluorescence at 60 d to humic-like and fulvic-like florescence in column 2. But fluorescence peak of leachate DOM was protein-like fluorescence at 60 d and 95 d in column 1. Those indicated that the operation of leachate recirculated combining with semi-aerobic accelerate stabilization process.