Department of Civil Engineering, University of Granada, Campus Fuentenueva 18071, Granada, Spain.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2012;47(1):54-9. doi: 10.1080/10934529.2012.629580.
The feasibility of a biological aerated filter for the treatment of a partially stabilized leachate from a landfill receiving non-recyclable wastes was assessed in laboratory-scale experiments. Maximum COD, BOD(5) and TSS removal efficiencies achievable by the biofilter as well as the optimal hydraulic and organic loading rates were determined by laboratory-scale tests in batch and continuous mode. Experiments in batch mode which lasted for 7 days showed that COD and BOD(5) removal efficiencies were stabilized after the second day of operation and kept at around 56-60% and 83-97%, respectively, for the rest of the period studied. The remaining fraction (approximately 40% of the COD) was found to be composed of recalcitrant or not easily biodegradable compounds. The COD and BOD(5) removal efficiencies decreased with increasing hydraulic loading rates. The plant worked under optimal conditions at hydraulic loading rates of 0.71 and 1.41 m(3)/m(2)d (hydraulic retention times of 15.95 and 7.97 h, respectively) and at COD loading rates below 14 kg COD/m(3), where COD removal efficiencies were around 60%. TSS removal efficiencies were not significantly influenced by the hydraulic loading rate. The results obtained demonstrated the feasibility of a biological aerated filter for the removal of the biodegradable fraction of the organic matter contained in the leachate. However, a physicochemical process was found to be necessary as pre- or post-treatment for the removal of the recalcitrant fraction.
采用实验室规模的间歇和连续试验，评估了曝气生物滤池处理接收不可回收废物的垃圾填埋场部分稳定渗滤液的可行性。生物滤池所能达到的最大 COD、BOD5 和 TSS 去除效率，以及最佳水力和有机负荷率，均通过实验室规模的间歇和连续试验确定。持续 7 天的间歇试验表明，COD 和 BOD5 的去除效率在运行第二天后稳定，在研究期间的剩余时间内，分别保持在 56-60%和 83-97%左右。其余部分（约 COD 的 40%）被发现由难生物降解或不易生物降解的化合物组成。COD 和 BOD5 的去除效率随水力负荷率的增加而降低。该装置在水力负荷率为 0.71 和 1.41 m3/m2d（水力停留时间分别为 15.95 和 7.97 h）和 COD 负荷率低于 14 kg COD/m3 时，处于最佳条件下运行，此时 COD 去除效率约为 60%。TSS 去除效率不受水力负荷率的显著影响。研究结果表明，曝气生物滤池可用于去除渗滤液中可生物降解的有机物。然而，为了去除难生物降解的部分，发现需要进行物理化学处理作为预处理或后处理。
