Sanaei Daryoush, Mirshafiee Amir, Adibzadeh Amir
Student Research Committee, Baqiyatallah University of Medical Sciences Tehran Iran
Health Research Center, Life Style Institute, Baqiyatallah University of Medical Sciences Tehran Iran
RSC Adv. 2025 Jan 29;15(4):2947-2957. doi: 10.1039/d4ra08021a. eCollection 2025 Jan 23.
In addition to their advantages as promising methods for wastewater treatment, CWs exhibit poor performance in terms of N and P removal efficiency in the effluent of wastewater treatment plants. By focusing on this issue, we designed CWs integrated with a biochar-doped activated carbon cloth (ACC) electrode and alum sludge from water treatment plants as a substrate to achieve concomitant organic matter and nutrient removal efficiency. Compared with the use of one layer of alum sludge in CWs (CWs-C3) with ACC electrodes inserted in two layers, which uses one layer of alum sludge, a significant improvement in removal efficiency was achieved (96% for COD; 89% for TN; and 77% for TP). The findings revealed that the application of potential accompanied by the insertion of a cathode ACC electrode into the first layer of alum sludge was beneficial for completing nitrification and facilitating denitrification in the cathode and anode regions, respectively, resulting in increased removal of organic matter and nutrients. Further evaluation revealed that the TN-TP synergetic removal mechanism was influenced by the use of Fe as an electron donor and as a driving force for the development of autotrophic denitrifying bacteria to increase nitrate reduction. Additionally, the formation of FePO and AlPO and their adsorption through the interaction of FeOOH and AlOOH with phosphate constitute the main removal mechanism for TP in wastewater. Another reason for the increased removal efficiency in the CW-C3 reactor was the greater abundance and microbial diversity effectuated by the application of potential in the anode and cathode regions. In summary, a promising strategy for simultaneously promoting organic matter and nutrients and utilizing CWs on a large scale and in practical applications was proposed.
除了作为有前景的废水处理方法具有优势外，人工湿地在污水处理厂出水的氮和磷去除效率方面表现不佳。针对这一问题，我们设计了一种人工湿地，将生物炭掺杂的活性炭布（ACC）电极与来自水处理厂的明矾污泥作为基质相结合，以实现有机物和营养物质的同步去除效率。与在两层中插入ACC电极的人工湿地（CWs-C3）中使用一层明矾污泥相比，去除效率有了显著提高（化学需氧量为96%；总氮为89%；总磷为77%）。研究结果表明，在第一层明矾污泥中插入阴极ACC电极所伴随的电位施加，有利于分别在阴极和阳极区域完成硝化作用并促进反硝化作用，从而提高有机物和营养物质的去除率。进一步评估表明，总氮-总磷协同去除机制受铁作为电子供体以及作为自养反硝化细菌生长驱动力以增加硝酸盐还原的影响。此外，磷酸铁和磷酸铝的形成以及它们通过氢氧化铁和氢氧化铝与磷酸盐的相互作用而产生的吸附，构成了废水中总磷的主要去除机制。CW-C3反应器中去除效率提高的另一个原因是阳极和阴极区域施加电位所带来的更丰富的微生物数量和微生物多样性效应。总之，提出了一种在大规模实际应用中同时促进有机物和营养物质去除以及利用人工湿地的有前景的策略。
