Abstract Direct membrane filtration (DMF) process is a promising technology for up-concentration and recovery of organic matter (OM) from municipal wastewater. This study investigates anaerobic digestibility of up-concentrated OM obtained from the DMF process. Effluent from a primary sedimentation basin was used as feed water. Effect of polyaluminum chloride (PACl) addition to the DMF process on the anaerobic digestibility of obtained up-concentrated OM was also investigated because PACl is sometimes used as a coagulant in the DMF process for improving effluent quality and OM recovery, and for mitigating membrane fouling. Batch anaerobic digestion experiments were conducted to achieve these objectives. Fitting the obtained data to the reaction curve model revealed that maximum biogas production based on feed volatile solids (VSfed) from up-concentrated OM containing PACl reached 0.56 L-Biogas/g-VSfed, which was higher than from up-concentrated OM without PACl (0.47 L-Biogas/g-VSfed), waste activated sludge (0.35 L-Biogas/g-VSfed), and mixed sludge (0.48 L-Biogas/g-VSfed). Methane yield based on degraded VS (VSdeg) of up-concentrated OM containing PACl was 0.56 L-CH4/g-VSdeg, which was also highest. These results indicate the up-concentrated OM obtained from the DMF process has high potential for biogas production, and the addition of PACl in the DMF process (∼4.3 mg-Al/L) could enhance the biogas production.

中文翻译：

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城市污水直接膜过滤得到的浓缩有机物的厌氧消化率

摘要 直接膜过滤 (DMF) 工艺是一种很有前途的技术，可用于从城市污水中浓缩和回收有机物 (OM)。本研究调查了从 DMF 过程中获得的高浓度 OM 的厌氧消化率。来自初级沉淀池的出水被用作给水。还研究了在 DMF 工艺中添加聚氯化铝 (PACl) 对所获得的高浓度 OM 厌氧消化率的影响，因为 PACl 有时在 DMF 工艺中用作混凝剂，以提高出水质量和 OM 回收率，并减轻膜污染. 进行分批厌氧消化实验以实现这些目标。将获得的数据拟合到反应曲线模型显示基于进料挥发性固体 (VSfed) 的最大沼气产量达到 0.56 L-Biogas/g-VSfed，高于不含 PACl 的上浓缩 OM (0.47 L-Biogas/g-VSfed)、废弃活性污泥 (0.35 L-Biogas/g-VSfed) 和混合污泥 (0.48 L-Biogas/g-VSfed)。基于含有 PACl 的浓缩 OM 的降解 VS (VSdeg) 的甲烷产量为 0.56 L-CH4/g-VSdeg，这也是最高的。这些结果表明从 DMF 过程中获得的高浓度 OM 具有很高的沼气生产潜力，并且在 DMF 过程中添加 PACl（~4.3 mg-Al/L）可以提高沼气生产。废弃活性污泥（0.35 L-沼气/g-VSfed）和混合污泥（0.48 L-沼气/g-VSfed）。基于含有 PACl 的浓缩 OM 的降解 VS (VSdeg) 的甲烷产量为 0.56 L-CH4/g-VSdeg，这也是最高的。这些结果表明从 DMF 过程中获得的高浓度 OM 具有很高的沼气生产潜力，并且在 DMF 过程中添加 PACl（~4.3 mg-Al/L）可以提高沼气生产。废弃活性污泥（0.35 L-沼气/g-VSfed）和混合污泥（0.48 L-沼气/g-VSfed）。基于含有 PACl 的浓缩 OM 的降解 VS (VSdeg) 的甲烷产量为 0.56 L-CH4/g-VSdeg，这也是最高的。这些结果表明从 DMF 过程中获得的高浓度 OM 具有很高的沼气生产潜力，并且在 DMF 过程中添加 PACl（~4.3 mg-Al/L）可以提高沼气生产。