Oxygen mass transfer and post-denitrification in a modified rotating drum biological contactor
Oxygen mass transfer and post-denitrification in a modified rotating drum biological contactor
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改进的转鼓生物接触器中的氧传质和后反硝化
DOI：
10.1016/j.bej.2019.01.008
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发表时间：
2019-04-15
影响因子：
3.9
通讯作者：
Peng, Yongzhen
中科院分区：
文献类型：
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作者：
Li, Ning;Zeng, Wei;Peng, Yongzhen
介绍了一种实验室规模的转鼓式生物接触器(RDBC)，并对其进行了非生物氧传递速率和生活污水处理能力的研究。溶解氧传递试验表明，转鼓转速和浸没程度对料液中DO有较大影响，体积氧传递系数K(L)a为2.3~25.9h(-1)，有效地实现了反应器内的厌氧/缺氧/好氧状态。提出了利用RDBC处理人工含氮污水的后脱氮工艺。当水力停留时间为16h，分流比为3：1，缺氧转速为6rpm时，出水NH_4~+-N和TN分别为2.3 mg L~(-1)和7.3 mg L~(-1)，NH_4~+-N和TN的去除效率分别为94.1%和80.9%。亚硝化单胞菌和克氏假丝酵母在缺氧载体生物膜中占主导地位，说明好氧和厌氧氨氧化细菌的共存增加了缺氧后生物膜中TN的损失。本研究为污水生物处理提供了一种创新的非曝气技术，对简化操作、节约能源具有一定的指导意义。
A lab-scale rotating drum biological contactor (RDBC) was implemented and accessed concerning abiotic oxygen transfer rate and treatment capacity for domestic sewage. The dissolved oxygen (DO) transfer test showed that the rotational speed and the submergence level of drum greatly affected the DO in bulk liquid with the volumetric oxygen transfer coefficient K(L)a of 2.3-25.9 h(-1), effectively achieving anaerobic/anoxic/aerobic conditions in the reactor. The post-denitrification process was proposed using the RDBC to degrade the synthetic nitrogen-containing sewage wastewater. When the hydraulic retention time was 16 h, the flow distribution ratio was 3:1 and the anoxic rotational speed was 6 rpm, the effluent NH4+-N and TN were 2.3 mg L-1 and 7.3 mg L-1 with the NH4+-N and TN removal efficiency of 94.1% and 80.9%, respectively. The Nitrosomonas europaea and Candidatus Kuenenia dominated in the anoxic carried-biofilm, indicating that the coexisting of aerobic and anaerobic ammonium oxidation bacteria enhanced the TN loss in the post-anoxic tank. This study provides an innovative non-aeration technology for biological wastewater treatment and has implications to simplify operation and save energy.