Sun Zhiye, Li Mei, Wang Guofeng, Yan Xiaojun, Li Yi, Lan Meichao, Liu Rukang, Li Baoan
Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University Tianjin 300072 PR China
State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300072 PR China.
RSC Adv. 2020 Aug 4;10(48):28838-28847. doi: 10.1039/d0ra04120c. eCollection 2020 Aug 3.
A pilot-scale anaerobic/anoxic/aerobic-membrane aerated biofilm reactor (A/O-MABR) system was constructed to enhance carbon and nitrogen removal. The effects of major operating parameters including the nitrate recycling ratio (), sludge recycling ratio (), and aerobic tank dissolved oxygen (DO) concentration on the system performance were investigated. The average removal efficiencies of the chemical oxygen demand (COD), ammonium nitrogen (NH -N), and total nitrogen (TN) were 89.0 ± 3.2%, 98.8 ± 1.3%, and 68.5 ± 4.2%, respectively, and their effluent concentrations were averagely 22.6 ± 7.3, 0.32 ± 0.2, and 13.3 ± 1.2 mg L. The suspended sludge and biofilm in aerobic tank facilitated the simultaneous nitrification and denitrification (SND) processes. Indeed, unique biofilm layered structure and abundant microbial community in the biofilm on MABR would enhance nitrogen removal. Compared with the A/O system, the A/O-MABR system exhibited higher nitrifying bacteria oxygen uptake rate (OUR) of 58.1 and 54.5 mgO per gMLSS per h in suspended sludge and biofilm, respectively, and the lower mixed liquor suspended solid (MLSS) concentration of 1800 mg L. Moreover, high-throughput sequencing indicated that putative nitrogen removal bacteria such as and could be effectively enriched in the biofilm. Since the volume proportions of the anaerobic, anoxic, aerobic and settling tank in the existing A/O system of the WWTP was not changed, the A/O-MABR system was simple and practical for the upgrading of A/O system.
构建了中试规模的厌氧/缺氧/好氧膜曝气生物膜反应器（A/O-MABR）系统以提高碳氮去除效果。研究了主要运行参数，包括硝酸盐回流比（）、污泥回流比（）和好氧池溶解氧（DO）浓度对系统性能的影响。化学需氧量（COD）、氨氮（NH -N）和总氮（TN）的平均去除效率分别为89.0±3.2%、98.8±1.3%和68.5±4.2%，其出水浓度平均分别为22.6±7.3、0.32±0.2和13.3±1.2mg/L。好氧池中的悬浮污泥和生物膜促进了同步硝化反硝化（SND）过程。实际上，MABR上生物膜独特的分层结构和丰富的微生物群落会提高氮去除效果。与A/O系统相比，A/O-MABR系统在悬浮污泥和生物膜中分别表现出更高的硝化细菌氧摄取率（OUR），分别为每克MLSS每小时58.1和54.5mgO，且混合液悬浮固体（MLSS）浓度更低，为1800mg/L。此外，高通量测序表明，诸如和等假定的脱氮细菌可以在生物膜中有效富集。由于污水处理厂现有A/O系统中厌氧、缺氧、好氧和沉淀池的体积比例未改变，A/O-MABR系统对于A/O系统的升级改造而言简单实用。
