Enhanced biodegradation of pyridine using sequencing batch biofilm reactor under intermittent micro-aerobic condition. Issue 8 (2nd April 2020)

• Record Type: Journal Article
• Authors: Sun, Guoping; Wan, Junfeng; Sun, Yichen; Xie, Yunfei; Ren, Shengtao; Wang, Yan
• Is Part Of: Environmental technology. Volume 41:Issue 8(2020)
• Page Start: 1034
• Page End: 1043
• Publication Date: 2020-04-02
• Subjects: Pyridine -- intermittent micro-aerobic condition -- sequencing batch biofilm reactor (SBBR) -- kinetic study -- biodegradation pathway; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2018.1518995
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: A sequencing batch biofilm reactor under intermittent micro-aerobic or anaerobic conditions was investigated to remove pyridine at various concentrations from synthetic wastewater. The results showed that over 98% of pyridine (influent concentration ≤200 mg L −1 ) was degraded under intermittent micro-aerobic condition, while about 21% of pyridine was removed under anaerobic condition. Additionally, at least 60% of nitrogen located in the pyridine ring was transformed to ammonium. At the same time, the sulphate reduction was obviously inhibited under intermittent micro-aerobic conditions. The microscopic observation showed that abundant microorganisms were attached on the surface or inside of porous biocarriers under intermittent micro-aerobic conditions after a short-term period of operation. High-throughput sequencing analysis demonstrated that Azotobacter, Rhodobacteraceae and Tolumonas were the dominant species in the intermittent micro-aerobic system. The kinetic study at steady period showed that pyridine degradation was fitted well with the pseudo-first-order model ( R 2 > 0.96). The two possible intermediate products were identified and the possible biodegradation pathway of pyridine was proposed under micro-aerobic condition. GRAPHICAL ABSTRACT: