Engineering Department, Palermo University, Viale delle Scienze ed. 8, 90128, Palermo, Italy; GENOCOV Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Edifici Q, c/ de les Sitges s/n, Universitat Autònoma de Barcelona, 08193, Bellaterra, Barcelona, Spain.
Engineering Department, Palermo University, Viale delle Scienze ed. 8, 90128, Palermo, Italy.
J Environ Manage. 2023 Oct 1;343:118272. doi: 10.1016/j.jenvman.2023.118272. Epub 2023 May 29.
The aim of this work was to study the effect of organic loading rate on the production of Polyhydroxyalkanoates (PHA) from sewage sludge. Synthesis of PHA using sewage sludge as platform was achieved in this work. Three pilot-scale selection-sequencing batch reactors (S-SBR) were used for obtaining a culture able to accumulate PHA following a strategy of aerobic dynamic feeding (ADF) at different volumetric organic-loading-rate (vOLR): 1.3, 1.8 and 0.8 g COD L d for S-SBR 1, S-SBR 2 and S-SBR 3, respectively. Decreasing the vOLR enhanced the general performance of the process as for organic matter removal (from 99.2% ± 0.3% in S-SBR-3 to 92 ± 2 in S-SBR-2) while the opposite trend was recorded for PHA production (6.0 PHA % w/w in S-SBR-3 vs 13.7 PHA % w/w in S-SBR-2 at the end of the feast phase). Furthermore, indirect and direct emissions, as N2O, were evaluated during the process for the first time. Finally, three accumulation tests were performed achieving 24% w/w.
本工作旨在研究有机负荷率对污水污泥中聚羟基烷酸酯（PHA）生产的影响。本工作利用污水污泥作为平台合成了 PHA。采用三个中试选择-序批式反应器（S-SBR），采用有氧动态进料（ADF）策略，在不同体积有机负荷率（vOLR）下获得能够积累 PHA 的培养物：S-SBR1、S-SBR2 和 S-SBR3 分别为 1.3、1.8 和 0.8 g COD L d。降低 vOLR 增强了工艺的整体性能，如有机物去除（从 S-SBR-3 的 99.2%±0.3%到 S-SBR-2 的 92±2%），而 PHA 生产则呈现相反的趋势（在饱食阶段结束时，S-SBR-3 为 6.0 PHA%w/w，S-SBR-2 为 13.7 PHA%w/w）。此外，首次在该过程中评估了间接和直接排放物，如 N2O。最后，进行了三次积累测试，达到了 24%w/w。
