Biodegradation of 2,4,6-trinitrophenol (picric acid) in a biological aerated filter (BAF) |
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| Authors: | Jinyou Shen Rui He Hongxia Yu Lianjun Wang Jianfa Zhang Xiuyun Sun Jiansheng Li Weiqing Han Lu Xu |
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| Institution: | 1. College of Pharmacy, Catholic University of Daegu, Hayang, Gyeongsan 712-702, Republic of Korea;2. College of Natural Science, Kangwon National University, Kangwon 200-701, Republic of Korea;3. School of Life Science and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu 702-701, Republic of Korea;1. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006,China;2. Institute of Chemistry, Environmental-science and Engineering-study Center, Shanxi University, Taiyuan 030006, China;1. Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India;2. Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039, India |
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| Abstract: | This study demonstrated the microbial purification of a model wastewater containing 2,4,6-trinitrophenol (TNP), which was carried out in a continuously working biological aerated filter (BAF). The main emphasis was on the operating performance of the reactor as a function of the pollution load. TNP was degraded at a maximum volumetric removal rate of 2.53 g TNP/L d, with low residual COD and TNP concentration. Overloading of TNP inhibited the nitrite-oxidizing activity, resulting in poor TNP degradation performance in the BAF system. The inhibition depended on some factors, such as influent concentrations and flow rates of the influent. It is assumed that nitrite-oxidizing occurred spontaneously during TNP degradation in the BAF system, could have significant influence on TNP wastewater treatment. One year after the reactor start-up, the dominance of Rhodococcus, which was initially inoculated in the reactor, was confirmed by analysis of 16S rDNA sequence of the PCR products separated by DGGE. |
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