厌氧-准好氧运行加速生物反应器填埋场垃圾稳定的研究

通过厌氧型、好氧型和准好氧型生物反应器填埋场的比较,提出了厌氧-准好氧联合运行加速生物反应器填埋场垃圾降解和稳定的填埋场运行方法,并通过模拟试验进行了研究.结果表明,按厌氧方式运行710 d的模拟垃圾柱改为按准好氧方式运行360 d后,每天回灌1次的D1柱和每周回灌2次的D4柱渗滤液COD浓度分别由705 mg/L和669 mg/L下降到135mg/L和178 mg/L,氨氮浓度由650 mg/L和877 mg/L降到不能检出水平;而继续按厌氧方式运行的垃圾柱D2和D3的渗滤液COD浓度仅分别由435mg/L和852 mg/L下降到295 mg/L和596 mg/L,氨氮浓度由654 mg/L和1 107 mg/L下降到469mg/L和783 mg/L.模拟厌氧型生物反应器填埋场垃圾柱稳定后期改为按准好氧方式运行,能加快渗滤液COD和氨氮浓度的衰减速率,而较高的渗滤液回灌频率更能强化这一优势.

Acceleration the Stabilization of Waste in Bioreactor Landfill by Sequential Anaerobic and Semi-Aerobic Operation

Based on the comparison between anaerobic,aerobic and semi-aerobic bioreactor landfill,the method to acceleration the stabilization process of waste in bioreactor landfill by sequential anaerobic and semi-aerobic operation mode was brought forward and put into practice in simulated experiment.When the operation mode was changed from anaerobic mode to semi-aerobic mode in the 710th day,the COD concentration of simulated bioreactor landfill column D1(leachate recirculation once everyday) and D4(leachate recirculation twice every week) was dropped from 705mg/L,669mg/L to 135mg/L,178mg/L and the ammonia-N concentration was dropped from 650mg/L,877mg/L to undetectable level after 360 days.At the same time,the COD concentration of control column D2 and D3 was dropped from 435mg/L,852mg/L to 295mg/L,596mg/L and the ammonia-N concentration was dropped from 654mg/L,(1 107mg/L) to 469mg/L,783mg/L.The rate of COD and ammonia-N concentration drop in leachate was enhanced largely after the operation mode of simulated bioreactor landfill column was changed from anaerobic mode to semi-aerobic mode.It was also shown that higher leachate recirculation frequency is more favorable for this process.