Hou Yuqiu, Liu Mei, Tan Xiao, Hou Siyu, Yang Ping
College of Architecture and Environment, Sichuan University Chengdu 610065 China
RSC Adv. 2021 Aug 10;11(44):27322-27332. doi: 10.1039/d1ra03286k. eCollection 2021 Aug 9.
A moving bed biofilm reactor (MBBR) is a kind of commonly used biological sewage treatment process. A carrier, the core of MBBR, could directly affect the treatment efficiency of MBBR. In this experiment, a hybrid carrier composed of an MBBR carrier and fluidized bed porous carrier was innovatively utilized to treat low-concentration simulated domestic sewage through an MBBR reactor to investigate the effects of different hydraulic retention times (HRT) and different carrier dose ratios on the reactor performance. The results indicated that when the volume ratio of the carrier dosage was 5% : 20% when the reactor HRT was 5 h, the removal rates of ammonia nitrogen, total nitrogen (TN) and chemical oxygen demand (COD) were optimal, which were 96.5%, 60.9% and 91.5%, respectively. The ammonia nitrogen, total nitrogen and COD concentrations of the effluent were 1.04 mg L, 12.20 mg L and 29.02 mg L, respectively. Furthermore, the total biomass concentration in the hybrid carrier biofilm reactor (HCBR) was 3790.35 mg L, which also reached the highest value. As the experiment progressed, the concentrations of protein, polysaccharide and soluble microbial products (SMP) were reduced to 7.68 mg L, 11.10 mg L and 18.08 mg L, respectively. This was basically consistent with the results of the three-dimensional fluorescence spectrum. The results showed that the combined-carrier biofilm reactor could reduce the volumetric filling rate, improving the removal capability of organic matter and the denitrification efficiency. This study provided technical support for the composite carrier biofilm wastewater treatment technology, and also had a good prospect of application.
移动床生物膜反应器（MBBR）是一种常用的生物污水处理工艺。载体作为MBBR的核心，会直接影响MBBR的处理效率。在本实验中，创新性地利用由MBBR载体和流化床多孔载体组成的混合载体，通过MBBR反应器处理低浓度模拟生活污水，以研究不同水力停留时间（HRT）和不同载体投加比例对反应器性能的影响。结果表明，当反应器HRT为5 h且载体投加量的体积比为5%∶20%时，氨氮、总氮（TN）和化学需氧量（COD）的去除率最佳，分别为96.5%、60.9%和91.5%。出水氨氮、总氮和COD浓度分别为1.04 mg/L、12.20 mg/L和29.02 mg/L。此外，混合载体生物膜反应器（HCBR）中的总生物量浓度为3790.35 mg/L，也达到了最高值。随着实验进行，蛋白质、多糖和可溶性微生物产物（SMP）的浓度分别降至7.68 mg/L、11.10 mg/L和18.08 mg/L。这与三维荧光光谱结果基本一致。结果表明，复合载体生物膜反应器可降低体积填充率，提高有机物去除能力和反硝化效率。本研究为复合载体生物膜污水处理技术提供了技术支持，且具有良好的应用前景。
