Ko Jae Hac, Ma Zeyu, Jin Xiao, Xu Qiyong
a Key Laboratory for Eco-Efficient Polysilicate Materials, School of Environment and Energy , Peking University Shenzhen Graduate School , Guangdong , People's Republic of China.
J Air Waste Manag Assoc. 2016 Dec;66(12):1245-1256. doi: 10.1080/10962247.2016.1209596.
Research has been conducted to investigate the effects of daily aeration frequency on leachate quality and waste settlement in simulated hybrid landfill bioreactors. Four laboratory-scale reactors were constructed and operated for about 10 months to simulate different bioreactor operations, including one anaerobic bioreactor and three hybrid bioreactors with different aeration frequencies (one, two, and four times per day). Chemical oxygen demand (COD) and biochemical oxygen demand (BOD) reduced more than 96% of the initial concentrations in all aerated bioreactors. The differences of COD and BOD reductions among tested aeration frequencies were relatively small. For ammonia nitrogen, the higher aeration frequency (two or four times per day) resulted in the quicker reduction. Overall, the concentrations of heavy metals (Cr, Co, Cu, Mn, Ni, and Zn) decreased over time except Cd and Pb. The reduction of redox-sensitive metal concentrations (Mn, Co, Ni, and Cu) was greater in aerated bioreactors than in anaerobic bioreactor. Settlement of municipal solid waste (MSW) was enhanced with higher frequency of aeration events (four times per day).
In recent years, hybird bioreactor landfill technology has gained a lot of attention. Appropriate aeration rate is crucial for hybrid bioreactor operation, but few studies have been done and different results were obtained. Research was conducted to investigate the effects of daily aeration frequency on leachate quality and waste settlement. Results indicated that aeration can effectively accelerate waste stabilization and remove organic carbon concentration and total nitrogen in the leachate.
已开展研究以调查每日曝气频率对模拟混合式垃圾填埋生物反应器中渗滤液质量和垃圾沉降的影响。构建了四个实验室规模的反应器并运行约10个月，以模拟不同的生物反应器运行情况，包括一个厌氧生物反应器和三个曝气频率不同的混合生物反应器（每天一次、两次和四次）。在所有曝气生物反应器中，化学需氧量（COD）和生化需氧量（BOD）降低至初始浓度的96%以上。测试的曝气频率之间COD和BOD降低的差异相对较小。对于氨氮，较高的曝气频率（每天两次或四次）导致其更快降低。总体而言，除镉和铅外，重金属（铬、钴、铜、锰、镍和锌）的浓度随时间下降。曝气生物反应器中对氧化还原敏感的金属浓度（锰、钴、镍和铜）的降低幅度大于厌氧生物反应器。城市固体废物（MSW）的沉降随着曝气事件频率的增加（每天四次）而增强。
近年来，混合式生物反应器填埋技术备受关注。合适的曝气速率对混合式生物反应器的运行至关重要，但相关研究较少且结果各异。开展了研究以调查每日曝气频率对渗滤液质量和垃圾沉降的影响。结果表明，曝气可有效加速垃圾稳定化，并去除渗滤液中的有机碳浓度和总氮。
