Biofilm Research Institute, Qingdao Spring Water Treatment Co. Ltd, Qingdao 266555, P. R. China E-mail:
Dongguan Water Group Co., Ltd, Dongguan 523109, P. R. China.
Water Sci Technol. 2022 Dec;86(12):3051-3066. doi: 10.2166/wst.2022.380.
The pure-MBBR process was applied to remove ammonia in a full-scale micro-polluted-water treatment plant with a daily treatment capacity of 260 × 10 m/d, Guangdong, China. The relationship between treatment efficiency, physical and chemical properties and microbial diversity in the process of biofilm growth was explored, and the oxygen transfer model of biofilm was established. The results show that the effluent of two-stage pure MBBR process is stable and up to standard after 10 days' incubation. The nitrification loads of two-stage biofilm was stable on the 14th day. The biomass and biofilm thickness lagged behind the nitrification load, and reached a relatively stable level on the 28th day. The species richness of biofilm basically reached a stable level on the 21st day, and the microbial diversity of primary biofilm was higher. In the primary and secondary stage at different periods, the relative abundance of dominant nitrifying bacteria Nitrospira reaches 8.48-13.60%, 6.48-9.27%, and Nitrosomonas reaches 2.89-5.64%, 0.00-3.48%. The pure MBBR system mainly adopts perforated aeration. Through the cutting and blocking of bubbles by suspended carriers, the oxygen transfer rate of the system was greatly improved.
采用纯 MBBR 工艺在中国广东一座日处理能力为 260×10^4m^3/d 的全规模微污染水处理厂去除氨氮。考察了生物膜生长过程中处理效率、理化性质和微生物多样性之间的关系，并建立了生物膜的氧传递模型。结果表明，两段式纯 MBBR 工艺经过 10 天的培养后，出水稳定达标。两段式生物膜的硝化负荷在第 14 天稳定，生物量和生物膜厚度滞后于硝化负荷，在第 28 天达到相对稳定水平。生物膜的物种丰富度基本在第 21 天达到稳定水平，初级生物膜的微生物多样性较高。在不同时期的一、二级中，优势硝化细菌 Nitrospira 的相对丰度分别达到 8.48-13.60%、6.48-9.27%，Nitrosomonas 达到 2.89-5.64%、0.00-3.48%。纯 MBBR 系统主要采用穿孔曝气，通过悬浮载体对气泡的切割和阻挡，大大提高了系统的氧传递速率。
