Shitu Abubakar, Chen Wei, Tadda Musa Abubakar, Zhang Yadong, Ye Zhangying, Liu Dezhao, Zhu Songming, Zhao Jian
College of Bio-systems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China; Department of Agricultural and Environmental Engineering, Faculty of Engineering, Bayero University, Kano, Nigeria.
College of Bio-systems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China.
Chemosphere. 2023 Jul;330:138772. doi: 10.1016/j.chemosphere.2023.138772. Epub 2023 Apr 23.
Fabricating low-cost and efficient biofilm carriers for moving bed biofilm reactors in wastewater treatment is crucial for achieving environmental sustainability. Herein, a novel sponge biocarrier doped with NaOH-loaded biochar and nano ferrous oxalate (sponge-CFeO@NBC) was prepared and evaluated for nitrogenous compounds removal from recirculating aquaculture systems (RAS) wastewater by stepwise increasing ammonium nitrogen (NH-N) loading rates. The prepared NBC, sponge-CFeO@NBC, and matured biofilms were characterized using SEM, FTIR, BET, and N adsorption-desorption techniques. The results reveal that the highest removal rates of NH-N reached 99.28 ± 1.3% was yielded by the bioreactor filled with sponge-CFeO@NBC, with no obvious nitrite (NO-N) accumulation in the final phase. The reactor packed with sponge-CFeO@NBC biocarrier had the highest relative abundance of functional microorganisms responsible for nitrogen metabolism than in the control reactor, confirmed from 16S rRNA gene sequencing analysis. Our study provides new insights into the newly developed biocarriers for enhancing RAS biofilters treatment performance in keeping water quality within the acceptable level for the rearing of aquatic species.
制造用于废水处理中移动床生物膜反应器的低成本高效生物膜载体对于实现环境可持续性至关重要。在此，制备了一种掺杂负载NaOH的生物炭和纳米草酸亚铁的新型海绵生物载体（海绵-CFeO@NBC），并通过逐步提高铵氮（NH-N）负荷率来评估其对循环水养殖系统（RAS）废水含氮化合物的去除效果。使用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、比表面积分析仪（BET）和氮吸附-脱附技术对制备的生物炭（NBC）、海绵-CFeO@NBC和成熟生物膜进行了表征。结果表明，填充海绵-CFeO@NBC的生物反应器对NH-N的最高去除率达到99.28±1.3%，在最后阶段没有明显的亚硝酸盐（NO-N）积累。从16S rRNA基因测序分析证实，填充海绵-CFeO@NBC生物载体的反应器中负责氮代谢的功能微生物的相对丰度高于对照反应器。我们的研究为新开发的生物载体提供了新的见解，有助于提高RAS生物滤池的处理性能，使水质保持在水产养殖可接受的水平内。
