School of Engineering and Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, Victoria 3000, Australia; Department of Civil Engineering, University of the Philippines - Los Baños, Pili Drive, College, Laguna 4031, Philippines.
School of Engineering and Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, Victoria 3000, Australia.
Sci Total Environ. 2022 Oct 1;841:156601. doi: 10.1016/j.scitotenv.2022.156601. Epub 2022 Jun 15.
Various studies provide information about the high potential of using hollow fiber membrane contactors (HFMCs) for the recovery of dissolved methane from anaerobically treated wastewater effluent and the effects of different operating conditions on their performance. However, majority of those studies evaluated HFMCs at bench scale under favorable conditions, i.e. clean water as feed under short-term operations. This study evaluated the performance of porous HFMC and dense HFMC (in terms of dissolved methane removal efficiency and methane desorption flux) subjected to anaerobic feed during long-term operation of one month. The study will provide better understanding of the performance of HFMCs with conditions expected at large-scale wastewater treatment systems. From the results, the decrease in the performance of HFMCs and the increase in the mass transfer resistance per week under varying feed flux were determined. These relationships were utilized in a numerical model to incorporate the effect of long-term operation to evaluate the performance of upscaled HFMCs. The fit of the model with the experimental data with one month of operation was evaluated and the relative errors were 11.9 % and 15.3 % for porous HFMC and dense HFMC, respectively. Moreover, results showed that dense HFMC will provide better performance than porous HFMC if it were to be operated longer than two weeks before cleaning. The net energy for porous HFMC and dense HFMC were optimized to be 0.07 and 0.02 kWh·d, respectively. Although these results are specific to the operations and conditions used for the HFMCs in this study, the methodology established for incorporating the effect of long-term operation will be highly relevant in evaluating the performance of HFMCs in large-scale wastewater treatment applications. This will contribute to the improved recovery of dissolved methane to reduce the greenhouse gas emissions in the atmosphere and to provide additional source of clean and sustainable energy.
各种研究提供了有关使用中空纤维膜接触器 (HFMC) 从厌氧处理废水流出物中回收溶解甲烷的高潜力的信息，以及不同操作条件对其性能的影响。然而，大多数这些研究在有利条件下，即在清洁水作为进料的情况下，在实验室规模上评估了 HFMC。本研究评估了多孔 HFMC 和致密 HFMC（就溶解甲烷去除效率和甲烷解吸通量而言）在一个月的长期运行期间在厌氧进料条件下的性能。该研究将更好地了解在大型废水处理系统中预期条件下 HFMC 的性能。结果确定了 HFMC 性能的下降和每周传质阻力的增加，这与进料通量的变化有关。这些关系被用于数值模型中，以纳入长期运行的影响来评估放大 HFMC 的性能。用一个月的运行数据对模型进行了拟合，多孔 HFMC 和致密 HFMC 的相对误差分别为 11.9%和 15.3%。此外，结果表明，如果在清洗前操作超过两周，致密 HFMC 将提供比多孔 HFMC 更好的性能。多孔 HFMC 和致密 HFMC 的净能量分别优化为 0.07 和 0.02 kWh·d。尽管这些结果特定于本研究中 HFMC 所使用的操作和条件，但建立的方法将对评估 HFMC 在大型废水处理应用中的性能具有重要意义。这将有助于提高溶解甲烷的回收，以减少大气中的温室气体排放，并提供清洁和可持续能源的额外来源。
