ICEA, Department of Civil, Architectural and Environmental Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
DII, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
Waste Manag. 2017 Sep;67:193-202. doi: 10.1016/j.wasman.2017.05.006. Epub 2017 May 9.
Hybrid Bioreactor Landfills are designed to enhance and speed up biological processes, aiming at reducing the duration of post operational phase until landfill completion. S.An.A.® (Semi-aerobic, Anaerobic, Aerated) concept consists in a Hybrid Bioreactor featuring a first semi-aerobic phase to enhance the methane production occurring in the following anaerobic step and a forced aeration for the abatement of the residual emissions. At the end of the last step, semi-aerobic conditions are restored and flushing applied for leaching residual non-biodegradable compounds. Results of the application of S.An.A.® concept to a lab scale bioreactor system showed that pre-aeration was effective in controlling the concentration of VFA, increasing pH and stimulating methane production during anaerobic phase; in particular with intermittent airflow the methane potential was 50% higher respect to control reactors. Forced aeration reduced organic compounds and nitrogen concentration in leachate of an order of magnitude, better performing in low airflow reactors. S.An.A.® Hybrid bioreactors proved to be an efficient system both for increasing methane production and reaching landfill completion in shorter time, suggesting that with proper landfill management, the duration of post-closure care might be reduced by 25-35%.
混合生物反应器垃圾填埋场旨在增强和加速生物过程，旨在缩短运营后阶段的时间，直至垃圾填埋场完成。S.An.A.®（半好氧、厌氧、曝气）概念是一种混合生物反应器，具有第一个半好氧阶段，以增强随后的厌氧步骤中发生的甲烷生产，并强制曝气以减少残留排放。在最后一步结束时，恢复半好氧条件并进行冲洗以浸出残留的不可生物降解化合物。将 S.An.A.®概念应用于实验室规模生物反应器系统的结果表明，预曝气可有效控制 VFA 的浓度，提高 pH 值并刺激厌氧阶段的甲烷生产；特别是间歇式气流使甲烷潜力比对照反应器高 50%。强制曝气将有机化合物和氮浓度降低了一个数量级，在低气流反应器中的效果更好。S.An.A.®混合生物反应器被证明是一种有效系统，既能增加甲烷产量，又能在更短的时间内达到垃圾填埋场完成，这表明通过适当的垃圾填埋场管理，关闭后护理的持续时间可能会减少 25-35%。
