Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad 826004, Jharkhand, India.
Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad 826004, Jharkhand, India.
Waste Manag. 2020 May 1;108:41-50. doi: 10.1016/j.wasman.2020.04.031. Epub 2020 Apr 24.
In the present study, the treatment of synthetic landfill leachate was carried out using a lab-scale anaerobic hybrid membrane bioreactor (An-HMBR). The reactor was operated for 250 days at two days of hydraulic retention time (HRT). Average chemical oxygen demand (COD) removal efficiency was ≥ 88% at steady-state conditions at 100% raw leachate. As organic loading rate (OLR) increased from 1.6 to 13.9 Kg COD m d, flux gradually declined from 70 to 52 L/m h (LMH) within 250 days. Chemical membrane cleaning enhanced the flux up to 75% of the initial flux at the final stage of the reactor. Reversible fouling (>90%) dominated over irreversible fouling (<8%). Membrane fouling was mainly caused by extracellular polymeric substances (EPS) fraction, which resulted in cake layer formation on the ceramic membrane used in the An-HMBR system. Membrane resistance increased with variables in the following order OLR > MLSS (mixed liquor suspended solids) > EPS > SMP (soluble microbial products). A nonlinear regression model developed for prediction of membrane resistance at different OLR can predict with an error of ±7%.
在本研究中，使用实验室规模的厌氧混合膜生物反应器（An-HMBR）处理合成垃圾渗滤液。在水力停留时间（HRT）为 2 天的条件下，该反应器运行了 250 天。在稳态条件下，当进水渗滤液 100%为原水时，平均化学需氧量（COD）去除率≥88%。随着有机负荷率（OLR）从 1.6 增加到 13.9 Kg COD m d，通量在 250 天内逐渐从 70 降至 52 L/m h（LMH）。化学膜清洗可将通量提高至反应器末期初始通量的 75%。可恢复性污染（>90%）占主导地位，不可逆污染（<8%）。膜污染主要是由胞外聚合物物质（EPS）引起的，这导致陶瓷膜上形成了滤饼层。膜阻力随变量的变化按以下顺序增加：OLR > MLSS（混合液悬浮固体）> EPS > SMP（可溶性微生物产物）。针对不同 OLR 开发的膜阻力预测非线性回归模型可预测误差为±7%。
