Dhiman Sourbh, Balakrishnan Malini, Naddeo Vincenzo, Ahsan Naved
Department of Civil Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi, 110025 India.
The Energy and Resources Institute (TERI), Darbari Seth Block, IHC Complex, Lodhi Road, New Delhi, 110003 India.
Water Air Soil Pollut. 2023;234(3):141. doi: 10.1007/s11270-023-06173-3. Epub 2023 Feb 16.
This study assesses the performance of waste sugarcane bagasse ash (SBA)-based ceramic membrane in anaerobic membrane bioreactor (AnMBR) treating low-strength wastewater. The AnMBR was operated in sequential batch reactor (SBR) mode at hydraulic retention time (HRT) of 24 h, 18 h, and 10 h to understand the effect on organics removal and membrane performance. Feast-famine conditions were also examined to evaluate system performance under variable influent loadings. An average removal of >90% chemical oxygen demand (COD) was obtained at each HRT and starvation periods up to 96 days did not significantly affect removal efficiency. However, feast-famine conditions affected extracellular polymeric substances (EPS) production and consequently the membrane fouling. EPS production was high (135 mg/g MLVSS) when the system was restarted at 18 h HRT after shutdown (96 days) with corresponding high transmembrane pressure (TMP) build-up; however, the EPS content stabilized at ~60-80 mg/g MLVSS after a week of operation. Similar phenomenon of high EPS and high TMP was experienced after other shutdowns (94 and 48 days) as well. Permeate flux was 8.8±0.3, 11.2±0.1 and 18.4±3.4 L/m h at 24 h, 18 h and 10 h HRT, respectively. Filtration-relaxation (4 min - 1 min) and backflush (up to 4 times operating flux) helped control fouling rate. Surface deposits (that significantly attributed to fouling) could be effectively removed by physical cleaning, resulting in nearly complete flux recovery. Overall, SBR-AnMBR system equipped with waste-based ceramic membrane appears promising for treatment of low-strength wastewater with disruptions in feeding.
The online version contains supplementary material available at 10.1007/s11270-023-06173-3.
本研究评估了以废弃甘蔗渣灰（SBA）为基础的陶瓷膜在厌氧膜生物反应器（AnMBR）中处理低强度废水的性能。AnMBR以序批式反应器（SBR）模式运行，水力停留时间（HRT）分别为24小时、18小时和10小时，以了解对有机物去除和膜性能的影响。还研究了 feast-famine 条件，以评估可变进水负荷下的系统性能。在每个HRT下，化学需氧量（COD）的平均去除率均>90%，长达96天的饥饿期对去除效率没有显著影响。然而，feast-famine 条件影响了胞外聚合物（EPS）的产生，进而影响了膜污染。当系统在停机（96天）后以18小时HRT重启时，EPS产量较高（135毫克/克MLVSS），相应的跨膜压力（TMP）也较高；然而，运行一周后，EPS含量稳定在~60-80毫克/克MLVSS。在其他停机（94天和48天）后也出现了类似的高EPS和高TMP现象。在24小时、18小时和10小时HRT下，渗透通量分别为8.8±0.3、11.2±0.1和18.4±3.4升/平方米·小时。过滤-松弛（4分钟-1分钟）和反冲洗（高达4倍运行通量）有助于控制污染速率。通过物理清洗可以有效去除显著导致污染的表面沉积物，使通量几乎完全恢复。总体而言，配备基于废弃物的陶瓷膜的SBR-AnMBR系统在处理进料中断情况下的低强度废水方面似乎很有前景。
在线版本包含可在10.1007/s11270-023-06173-3获取的补充材料。
