The role of electron donors generated from UV photolysis for accelerating pyridine biodegradation
- 8 April 2015
- journal article
- research article
- Published by Wiley in Biotechnology & Bioengineering
- Vol. 112 (9), 1792-1800
- https://doi.org/10.1002/bit.25605
Abstract
Employing an internal circulation baffled biofilm reactor (ICBBR), we evaluated the mechanisms by which photolysis accelerated the biodegradation and mineralization of pyridine (C5H5N), a nitrogen-containing heterocyclic compound. We tested the hypothesis that pyridine oxidation is accelerated because a key photolysis intermediate, succinate, is as electron donor that promotes the initial mono-oxygenation of pyridine. Experimentally, longer photolysis time generated more electron-donor products (succinate), which stimulated faster pyridine biodegradation. This pattern was confirmed by directly adding succinate, and the stimulation effect occurred similarly with addition of the same equivalents of acetate and formate. Succinate, whether generated by UV photolysis or added directly, also accelerated mono-oxygenation of the first biodegradation intermediate, 2-hydroxyl pyridine (2HP). 2HP and pyridine were mutually inhibitory in that their mono-oxygenations competed for internal electron donor; thus, the addition of any readily biodegradable donor accelerated both mono-oxygenation steps, as well as mineralization. Biotechnol. Bioeng. 2015;112: 1792–1800.Funding Information
- National Natural Science Foundation of China (50978164)
- Key project of basic research in Shanghai (11JC1409100)
- Special Fund of State Key Joint Laboratory of Environment Simulation and Pollution Control (13K09ESPCT)
- Special Foundation of Chinese Colleges and Universities Doctoral Discipline (20113127110002)
- United States National Science Foundation (0651794)
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