Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, Istanbul, Turkey; BioCo Research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Gent, Belgium.
Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, Istanbul, Turkey.
Bioresour Technol. 2022 May;351:126965. doi: 10.1016/j.biortech.2022.126965. Epub 2022 Mar 9.
Energy-rich sludge can be obtained from primary clarifiers preceding biological reactors. Alternatively, the incoming wastewater can be sent to a very-high-loaded activated sludge system, i.e., a so-called A-stage. However, the effects of applying an A-stage instead of a primary clarifier, on the subsequent sludge digestion for long-term operation is still unknown. In this study, biogas production and permeate quality, and filterability characteristics were investigated in a lab-scale anaerobic membrane bioreactor for primary sludge and A-stage sludge (A-sludge) treatment. A higher specific methane yield was obtained from digestion of A-sludge compared to primary sludge. Similarly, specific methanogenic activity was higher when the anaerobic membrane bioreactor was fed with A-sludge compared to primary sludge. Plant-wide mass balance analysis indicated that about 35% of the organic matter in wastewater was recovered as methane by including an A-stage, compared to about 20% with a primary clarifier.
富含能量的污泥可以从生物反应器前的初次沉淀池获得。或者，可以将进入的废水送入超高负荷活性污泥系统，即所谓的 A 段。然而，在长期运行中，应用 A 段而不是初次沉淀池对后续污泥消化的影响尚不清楚。在这项研究中，在实验室规模的厌氧膜生物反应器中研究了原污泥和 A 段污泥（A 污泥）处理的沼气产量、渗透液质量和过滤特性。与原污泥相比，A 污泥消化产生的单位甲烷产量更高。同样，当厌氧膜生物反应器进料为 A 污泥时，比进料为原污泥时的甲烷生成活性更高。全厂质量平衡分析表明，与使用初次沉淀池相比，通过包括 A 段，废水中约 35%的有机物被回收为甲烷，而使用初次沉淀池则约为 20%。
