Acetonitrile wastewater treatment enhanced by a hybrid membrane-aerated bioreactor containing aerated and non-aerated zones. (October 2019)

• Record Type: Journal Article
• Authors: Mei, Xiang; Chen, Ying; Fang, Chenhong; Xu, Lijie; Li, Junhui; Bi, Shuqi; Liu, Juan; Wang, Yong; Li, Pengpeng; Guo, Zhongwei; Qin, Hailing; Gu, Jiawei; Xiao, Yanyan; Yang, Xu; Zhou, Baochang; Zhang, Ze
• Is Part Of: Bioresource technology. Volume 289(2019)
• Publication Date: 2019-10
• Subjects: Acetonitrile wastewater -- Membrane-aerated bioreactor -- Aerated zone -- Non-aerated zone -- Biological nitrogen removal; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.121754
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A membrane-aerated bioreactor (MAB) with aerated and non-aerated zones was constructed. HF-MAB and SR-MAB were used to enhance acetonitrile (ACN) wastewater treatment. Two zones synergistically promoted ACN degradation, nitrification and denitrification. HF-MAB achieved an ACN removal loading of 1.116 kg/m 3 ·d without secondary pollution. The performances of the HF-MAB were slightly better than those of the SR-MAB. Abstract: Acetonitrile (ACN) is a very volatile, toxic and nitrogen-rich organic compound. To enhance ACN wastewater treatment, a novel hybrid membrane-aerated bioreactor (MAB) containing aerated and non-aerated zones was established. A polypropylene hollow fiber membrane module (HF) and a silicone rubber membrane module (SR) were separately used as the bubble-free aeration diffuser and the biofilm carrier, and the non-aerated zones of these two types of reactors were packed with ceramsite. When the influent ACN loading was 1.200 kg/m 3 ·d, under aeration pressures of 20 kPa in the HF-MAB and 40 kPa in the SR-MAB, ACN removal loadings of 1.116 kg/m 3 ·d and 1.004 kg/m 3 ·d, respectively, were achieved, and the TN (total nitrogen) removal loadings were 0.267 kg/m 3 ·d and 0.246 kg/m 3 ·d, respectively. In the MABs, different stratified biofilm structures of the two zones and the diffusion and counter-diffusion of oxygen synergistically promoted ACN degradation, nitrification and denitrification.