State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, PR China.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, PR China; Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, 211800, PR China.
Chemosphere. 2019 Jul;227:117-123. doi: 10.1016/j.chemosphere.2019.03.186. Epub 2019 Apr 3.
Untreated terephthalic acid (TPA) wastewaters with high organic loads will cause severe environmental pollution problems. In this study, a lab-scale moving bed biofilm reactor, where biomass of Delftia sp. WL-3 is attached to polypropylene carrier elements, has been tested for TPA bioremediation at 25-27 °C. The system achieved stable operation after a short 15-day start-up period. During the operation period of 65 days, stable chemical oxygen demand (COD) and TPA removal efficiencies of 68% and 76% were maintained with an organic load rate (OLR) and hydraulic retention time of 2.5 kg COD·(m·d) and 24 h, respectively. In addition, the Scanning Electron Microscope (SEM) showed that high-densities of WL-3 biomass accumulated on the surface of the carrier and formed a rich biofilm, indicating polypropylene carrier can improve the degradation efficiency. On the contrary, the biodegradation ability of stain WL-3 without the polypropylene carrier declined significantly with removal efficiencies of 10% and 15% for COD and TPA. Furthermore, the system exhibited excellent robustness to different OLR and influent matrix ratios, indicating its potential for applications in the treatment of TPA-containment wastewater in the field.
未经处理的对苯二甲酸（TPA）废水有机负荷高，会造成严重的环境污染问题。本研究采用附着在聚丙烯载体上的 Delftia sp. WL-3 生物量的实验室规模移动床生物膜反应器，在 25-27°C 下对 TPA 进行生物修复。该系统在 15 天的短启动期后实现了稳定运行。在 65 天的运行期间，以 2.5kgCOD·(m·d)的有机负荷率（OLR）和 24h 的水力停留时间，分别保持了 68%和 76%的稳定化学需氧量（COD）和 TPA 去除效率。此外，扫描电子显微镜（SEM）显示，高密度的 WL-3 生物量积聚在载体表面并形成了丰富的生物膜，表明聚丙烯载体可以提高降解效率。相反，没有聚丙烯载体的 WL-3 生物量的生物降解能力显著下降，COD 和 TPA 的去除效率分别为 10%和 15%。此外，该系统对不同的 OLR 和进水基质比表现出优异的鲁棒性，表明其在处理 TPA 包容废水中具有应用潜力。
