Anaerobic treatment of wastewater from various sources is becoming increasingly popular as it can convert 73% of the chemical oxygen demand present in the wastewater to biogas. Methane in the biogas is the major contributor to produce energy in subsequent downstream processes. However, a significant amount of methane usually escapes to the environment through the treated effluent. This study proposes a model that can predict the recovery of dissolved methane and other performance parameters from the effluent of an anaerobic reactor using porous and dense hollow fiber membrane contactors (HFMCs) for the pilot- or large-scale application. The model introduced a distribution factor, m, to the liquid mass transfer coefficient to fit the experimental removal of dissolved methane and the methane desorption flux, J_CH4, through the HFMCs. The factor m was found to have a linear relationship with the average J_CH4. Further, it was found that a net energy gain of 0.34 MJ·m^-3 (0.024 MJ·kg^-1CH₄ for 16 mg·L^-1 dissolved methane in the feed) is achieved for an effluent flow rate of 11 m³·d^-1, with a methane content of 35% recovered from the HFMC. A break-even payback period will be attained when multiple modules of HFMC are used. The model provides simplified investigation of the potential and effectiveness of the HFMCs for dissolved methane recovery from anaerobic effluent, with further verification using data from pilot- and large-scale systems.

对各种来源的废水进行厌氧处理正变得越来越流行，因为它可以将废水中 73% 的化学需氧量转化为沼气。沼气中的甲烷是在随后的下游过程中产生能量的主要贡献者。然而，大量的甲烷通常通过处理后的流出物逃逸到环境中。本研究提出了一个模型，该模型可以预测厌氧反应器流出物中溶解甲烷的回收率和其他性能参数，该模型使用多孔和致密的中空纤维膜接触器 (HFMC) 进行中试或大规模应用。该模型在液体传质系数中引入了分布因子 m，以拟合溶解甲烷的实验去除和甲烷解吸通量 J _CH4，通过 HFMC。_{发现因子 m 与平均 J CH4}具有线性关系。此外，发现对于11 m ³的流出物流速，实现了0.34 MJ·m ^-3的净能量增益（0.024 MJ·kg ^-1 CH ₄对于进料中的16 mg·L ^-1溶解的甲烷） ·d ^-1，从HFMC中回收的甲烷含量为35%。当使用多个 HFMC 模块时，将达到收支平衡的投资回收期。该模型提供了对 HFMC 从厌氧流出物中回收溶解甲烷的潜力和有效性的简化研究，并使用来自中试和大规模系统的数据进行了进一步验证。