Journal
BIORESOURCE TECHNOLOGY
Volume 289, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121754
Keywords
Acetonitrile wastewater; Membrane-aerated bioreactor; Aerated zone; Non-aerated zone; Biological nitrogen removal
Funding
- Industry-University-Research Cooperation Project of China [028108011]
- National Natural Science Foundation of China [51708297]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province of China [SJCX17_0251]
- Priority Academic Program Development of Jiangsu Higher Education Institutions of China (PAPD)
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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.
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