Microbial detoxification of 3,5-xylenol via a novel process with sequential methyl oxidation by Rhodococcus sp. CHJ602

Yao, Ni-Hong; Du, Yanan; Xiong, Jia-Xi; Xiao, Ying; He, Hanghang; Xie, Zefeng; Huang, Duo; Qin, Song; Chen, Jing; Duan, Yan; Chao, Han-Chieh

doi:10.1016/j.envres.2023.115258

Cited by 4 publications

(2 citation statements)

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“…in the nitrogen removal process. Some researchers have reported that Rhodococcus sp., a Gram-positive bacterium, could be used in bioremediate environmental pollutants [21][22][23]. It has been found to exhibit impressive tolerance to various environments such as coking wastewater [24], Antarctic sea ice [25], and polluted soil [26].…”

Section: Isolation and Identification Of Strain S2mentioning

confidence: 99%

“…Furthermore, HN-AD bacteria existing in landfill leachate may be able to adjust to high ammonium concentrations. In previous studies, HN-AD bacteria such as Stenotrophomonas maltophilia DQ01 [21] and Alcaligenes faecalis TF-1 [22] were isolated from landfill leachates and exhibited good performance in carrying out nitrogen removal. However, although these strains showed considerable nitrification ability, they only showed low denitrification ability.…”

Section: Introductionmentioning

confidence: 99%

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A Newly Isolated Rhodococcus sp. S2 from Landfill Leachate Capable of Heterotrophic Nitrification and Aerobic Denitrification

Chen,

Li,

Zhang

et al. 2024

Water

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Nitrogen removal through heterotrophic nitrification–aerobic denitrification (HN–AD) has been acknowledged as one of the most efficient and cost-effective nitrogen removal processes. This study involved the isolation of a novel HN–AD bacterium (Rhodococcus sp. S2) from landfill leachate. Rhodococcus sp. S2 exhibited high nitrogen removal performance under aerobic conditions without the accumulation of nitrite as an intermediate. The maximum removal efficiencies for NH4+-N, NO2−-N, and NO3−-N were found to be 99.97 ± 0.3%, 99.79 ± 0.14%, and 83.53 ± 0.31%, respectively. Additionally, Rhodococcus sp. S2 demonstrated simultaneous nitrifying and denitrifying capabilities and showed a preference for utilizing NH4+-N in mixed nitrogen sources. The optimal nitrogen removal conditions for Rhodococcus sp. S2 were as follows: sodium acetate as a carbon source, a C/N ratio of 16, a shaking speed of 200 rpm, a pH of 9, and a temperature of 35 °C. Genome sequencing results revealed the presence of nitrate reductases (NarG), nitrate oxidoreductase (NxrA), and nitrite reductase (NirBD) in Rhodococcus sp. S2, providing further evidence of its HN–AD capability. In treating raw wastewater under the aforementioned experimental conditions, S2 achieved a maximum TN removal efficiency of 57.16 ± 0.52% with the addition of sodium acetate as a carbon source. These results suggest that Rhodococcus sp. S2 might be a promising candidate for wastewater nitrogen removal.

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