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4. Sustainable treatment of nitrate-containing wastewater by an autotrophic hydrogen-oxidizing bacterium

Author

Chen, Yi-Zhen, Zhang, Li-Juan, Ding, Ling-Yun, Zhang, Yao-Yu, Wang, Xi-Song, Qiao, Xue-Jiao, Pan, Bao-Zhu, Wang, Zhi-Wu, Xu, Nan, Tao, Hu-Chun, Chen, Yi-Zhen, Zhang, Li-Juan, Ding, Ling-Yun, Zhang, Yao-Yu, Wang, Xi-Song, Qiao, Xue-Jiao, Pan, Bao-Zhu, Wang, Zhi-Wu, Xu, Nan, and Tao, Hu-Chun

Abstract

Bacteria are key denitrifiers in the reduction of nitrate (NO3--N), which is a contaminant in wastewater treatment plants (WWTPs). They can also produce carbon dioxide (CO2) and nitrous oxide (N2O). In this study, the autotrophic hydrogen-oxidizing bacterium Rhodoblastus sp. TH20 was isolated for sustainable treatment of NO3--N in wastewater. Efficient removal of NO3--N and recovery of biomass nitrogen were achieved. Up to 99% of NO3--N was removed without accumulation of nitrite and N2O, consuming CO2 of 3.25 mol for each mole of NO3--N removed. The overall removal rate of NO3--N reached 1.1 mg L-1 h(-1) with a biomass content of approximately 0.71 g L-1 within 72 h. TH20 participated in NO3--N assimilation and aerobic denitrification. Results from N-15-labeled-nitrate test indicated that removed NO3--N was assimilated into organic nitrogen, showing an assimilation efficiency of 58%. Seventeen amino acids were detected, accounting for 43% of the biomass. Nitrogen loss through aerobic denitrification was only approximately 42% of total nitrogen. This study suggests that TH20 can be applied in WWTP facilities for water purification and production of valuable biomass to mitigate CO2 and N2O emissions. (C) 2022 Published by Elsevier B.V. on behalf of Chinese Society for Environmental Sciences, Harbin Institute of Technology, Chinese Research Academy of Environmental Sciences.

Published
2022

10. Ubiquity of polystyrene digestion and biodegradation within yellow mealworms, larvae of Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae)

Author

Shan, M.H., Yang, Shanshan, Wu, Wei-Min, Fan, Han-Qing, Brandon, Anja Malawi, Receveur, Joseph, Li, Yiran, Fan, Rui, Wang, Zhi-Yue, Gao, Shu-Hong, McClellan, Rebecca, Daliang, Ning, Phillips, Debra, Wang, Hongtao, Peng, Bo-Yu, Li, Ping, Cai, Shen-Yang, Ding, Ling-Yun, Cai, Wei-Wei, Yang, Jun, Zheng, Min, Ren, Jie, Zhang, Ya-Lei, Gao, Jie, Xing, Defeng, Ren, Nan-Qi, Waymouth, Robert, Zhou, Jizhong, Tao, Hu-Chun, Picard, Christine, Benbow, Mark, and Criddle, Craig

Subjects
0301 basic medicine, China, Environmental Engineering, Health, Toxicology and Mutagenesis, media_common.quotation_subject, Insect, 010501 environmental sciences, Biology, 01 natural sciences, 03 medical and health sciences, Animals, Environmental Chemistry, Food science, Feces, 0105 earth and related environmental sciences, media_common, Larva, Bacteria, Bran, Frass, Public Health, Environmental and Occupational Health, General Medicine, General Chemistry, Biodegradation, Pollution, Anti-Bacterial Agents, Gastrointestinal Microbiome, Coleoptera, Biodegradation, Environmental, 030104 developmental biology, Microbial population biology, Polystyrenes, Gentamicins, Digestion
Abstract

Academics researchers and “citizen scientists” from 22 countries confirmed that yellow mealworms, the larvae of Tenebrio molitor Linnaeus, can survive by eating polystyrene (PS) foam. More detailed assessments of this capability for mealworms were carried out by12 sources: five from the USA, six from China, and one from Northern Ireland. All of these mealworms digested PS foam. PS mass decreased and depolymerization was observed, with appearance of lower molecular weight residuals and functional groups indicative of oxidative transformations in extracts from the frass (insect excrement). An addition of gentamycin (30 mg g−1), a bactericidal antibiotic, inhibited depolymerization, implicating the gut microbiome in the biodegradation process. Microbial community analyses demonstrated significant taxonomic shifts for mealworms fed diets of PS plus bran and PS alone. The results indicate that mealworms from diverse locations eat and metabolize PS and support the hypothesis that this capacity is independent of the geographic origin of the mealworms, and is likely ubiquitous to members of this species.

Published
2018

12. Ubiquity of polystyrene digestion and biodegradation within yellow mealworms, larvae of Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae)

Author

Yang, Shan-Shan, primary, Wu, Wei-Min, additional, Brandon, Anja M., additional, Fan, Han-Qing, additional, Receveur, Joseph P., additional, Li, Yiran, additional, Wang, Zhi-Yue, additional, Fan, Rui, additional, McClellan, Rebecca L., additional, Gao, Shu-Hong, additional, Ning, Daliang, additional, Phillips, Debra H., additional, Peng, Bo-Yu, additional, Wang, Hongtao, additional, Cai, Shen-Yang, additional, Li, Ping, additional, Cai, Wei-Wei, additional, Ding, Ling-Yun, additional, Yang, Jun, additional, Zheng, Min, additional, Ren, Jie, additional, Zhang, Ya-Lei, additional, Gao, Jie, additional, Xing, Defeng, additional, Ren, Nan-Qi, additional, Waymouth, Robert M., additional, Zhou, Jizhong, additional, Tao, Hu-Chun, additional, Picard, Christine J., additional, Benbow, Mark Eric, additional, and Criddle, Craig S., additional

Published
2018
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