The Experts below are selected from a list of 846858 Experts worldwide ranked by ideXlab platform
Aijie Wang - One of the best experts on this subject based on the ideXlab platform.
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microbial community structure and function in response to the shift of sulfide nitrate loading ratio during the denitrifying sulfide removal process
Bioresource Technology, 2015Co-Authors: Cong Huang, Zhiling Li, Fan Chen, Youkang Zhao, Jizhong Zhou, Aijie WangAbstract:Influence of acetate-C/NO3-N/S-2 ratio to the functional microbial community during the denitrifying sulfide removal process is poorly understood. Here, phylogenetic and functional bacterial community for elemental sulfur (S-0) recovery and nitrate (NO3) removal were investigated with the switched S-2 /NO3 molar ratio ranged from 5/2 to 5/9. Optimized S-2 /NO3 ratio was evaluated as 5/6, with the bacterial genera predominated with Thauera, Enterobacter, Thiobacillus and Stappia, and the sqr gene highly expressed. However, insufficient or high loading of acetate and NO3 resulted in the low S-0 recovery, and also significantly modified the bacterial community and genetic activity. With S-2 /NO3 ratio of 5/2, autotrophic S-2 Oxidization genera were dominated and NO3 reduction activity was low, confirmed by the low expressed nirK gene. In contrast, S-2 /NO3 ratio switched to 5/8 and 5/9 introduced diverse heterotrophic nitrate reduction and S-0 over Oxidization genera in accompanied with the highly expressed nirK and sox genes. (C) 2015 Published by Elsevier Ltd.
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microbial community structure and function in response to the shift of sulfide nitrate loading ratio during the denitrifying sulfide removal process
Bioresource Technology, 2015Co-Authors: Cong Huang, Fan Chen, Youkang Zhao, Jizhong Zhou, Aijie Wang, Qian LiuAbstract:Influence of acetate-C/NO3(-)-N/S(2-) ratio to the functional microbial community during the denitrifying sulfide removal process is poorly understood. Here, phylogenetic and functional bacterial community for elemental sulfur (S(0)) recovery and nitrate (NO3(-)) removal were investigated with the switched S(2-)/NO3(-) molar ratio ranged from 5/2 to 5/9. Optimized S(2-)/NO3(-) ratio was evaluated as 5/6, with the bacterial genera predominated with Thauera, Enterobacter, Thiobacillus and Stappia, and the sqr gene highly expressed. However, insufficient or high loading of acetate and NO3(-) resulted in the low S(0) recovery, and also significantly modified the bacterial community and genetic activity. With S(2-)/NO3(-) ratio of 5/2, autotrophic S(2-) Oxidization genera were dominated and NO3(-) reduction activity was low, confirmed by the low expressed nirK gene. In contrast, S(2-)/NO3(-) ratio switched to 5/8 and 5/9 introduced diverse heterotrophic nitrate reduction and S(0) over Oxidization genera in accompanied with the highly expressed nirK and sox genes.
Jizhong Zhou - One of the best experts on this subject based on the ideXlab platform.
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microbial community structure and function in response to the shift of sulfide nitrate loading ratio during the denitrifying sulfide removal process
Bioresource Technology, 2015Co-Authors: Cong Huang, Zhiling Li, Fan Chen, Youkang Zhao, Jizhong Zhou, Aijie WangAbstract:Influence of acetate-C/NO3-N/S-2 ratio to the functional microbial community during the denitrifying sulfide removal process is poorly understood. Here, phylogenetic and functional bacterial community for elemental sulfur (S-0) recovery and nitrate (NO3) removal were investigated with the switched S-2 /NO3 molar ratio ranged from 5/2 to 5/9. Optimized S-2 /NO3 ratio was evaluated as 5/6, with the bacterial genera predominated with Thauera, Enterobacter, Thiobacillus and Stappia, and the sqr gene highly expressed. However, insufficient or high loading of acetate and NO3 resulted in the low S-0 recovery, and also significantly modified the bacterial community and genetic activity. With S-2 /NO3 ratio of 5/2, autotrophic S-2 Oxidization genera were dominated and NO3 reduction activity was low, confirmed by the low expressed nirK gene. In contrast, S-2 /NO3 ratio switched to 5/8 and 5/9 introduced diverse heterotrophic nitrate reduction and S-0 over Oxidization genera in accompanied with the highly expressed nirK and sox genes. (C) 2015 Published by Elsevier Ltd.
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microbial community structure and function in response to the shift of sulfide nitrate loading ratio during the denitrifying sulfide removal process
Bioresource Technology, 2015Co-Authors: Cong Huang, Fan Chen, Youkang Zhao, Jizhong Zhou, Aijie Wang, Qian LiuAbstract:Influence of acetate-C/NO3(-)-N/S(2-) ratio to the functional microbial community during the denitrifying sulfide removal process is poorly understood. Here, phylogenetic and functional bacterial community for elemental sulfur (S(0)) recovery and nitrate (NO3(-)) removal were investigated with the switched S(2-)/NO3(-) molar ratio ranged from 5/2 to 5/9. Optimized S(2-)/NO3(-) ratio was evaluated as 5/6, with the bacterial genera predominated with Thauera, Enterobacter, Thiobacillus and Stappia, and the sqr gene highly expressed. However, insufficient or high loading of acetate and NO3(-) resulted in the low S(0) recovery, and also significantly modified the bacterial community and genetic activity. With S(2-)/NO3(-) ratio of 5/2, autotrophic S(2-) Oxidization genera were dominated and NO3(-) reduction activity was low, confirmed by the low expressed nirK gene. In contrast, S(2-)/NO3(-) ratio switched to 5/8 and 5/9 introduced diverse heterotrophic nitrate reduction and S(0) over Oxidization genera in accompanied with the highly expressed nirK and sox genes.
Wang Qilin - One of the best experts on this subject based on the ideXlab platform.
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Effects of particle size of zero-valent iron (ZVI) on peroxydisulfate-ZVI enhanced sludge dewaterability
Science Press and Springer-Verlag GmbH, 2017Co-Authors: Xu Zhou, Chen Hongyi, Gao Shu-hong, Han Songfang, Tu Renjie, Wei Wei, Cai Chen, Liu Peng, Jin Wenbiao, Wang QilinAbstract:The advanced Oxidization process has proven to be an effective conditioning technique for the improvement of sludge dewaterability. Zero-valent iron (ZVI) is often used as the catalyst of the Oxidization process. This study applied ZVI with different particle sizes to the ZVI- peroxydisulfate reactions, and investigated their effects on the improvement of sludge dewaterability. It was found that ZVI particles with smaller sizes (100 and 400 meshes) led to slightly higher enhancement of sludge dewaterability (69.1%–72%) than the larger size particles (20–40 meshes) with the reduction rate of CST by 64%. However, after the treatment, the recycle rate of larger size ZVI particles was obviously higher than the small sizes ZVI particles: 98.3% vs. 87.6–89.7%. Different surface areas of the ZVI particles with different sizes might contribute to the phenomenon. For the small ZVI particles with the sizes of 100 and 400 meshes, no obvious differences of Oxidization effects and the improvements of sludge dewaterability were found between them, which might be because an oxide layer could have been formed on the surface of fine ZVI particles and led to agglomeration. According to the economical analysis, the small particles (100 and 400 meshes) of ZVI were more economically favorable for the oxidative conditioning process with ZVI-peroxydisulfate than large ZVI particles (20–40 meshes).No Full Tex
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Effects of particle size of zero-valent iron (ZVI) on peroxydisulfate-ZVI enhanced sludge dewaterability
'Springer Science and Business Media LLC', 2017Co-Authors: Xu Zhou, Chen Hongyi, Gao Shu-hong, Han Songfang, Tu Renjie, Wei Wei, Cai Chen, Liu Peng, Jin Wenbiao, Wang QilinAbstract:The advanced Oxidization process has proven to be an effective conditioning technique for the improvement of sludge dewaterability. Zero-valent iron (ZVI) is often used as the catalyst of the Oxidization process. This study applied ZVI with different particle sizes to the ZVI- peroxydisulfate reactions, and investigated their effects on the improvement of sludge dewaterability. It was found that ZVI particles with smaller sizes (100 and 400 meshes) led to slightly higher enhancement of sludge dewaterability (69.1%-72%) than the larger size particles (20-40 meshes) with the reduction rate of CST by 64%. However, after the treatment, the recycle rate of larger size ZVI particles was obviously higher than the small sizes ZVI particles: 98.3% vs. 87.6-89.7%. Different surface areas of the ZVI particles with different sizes might contribute to the phenomenon. For the small ZVI particles with the sizes of 100 and 400 meshes, no obvious differences of Oxidization effects and the improvements of sludge dewaterability were found between them, which might be because an oxide layer could have been formed on the surface of fine ZVI particles and led to agglomeration. According to the economical analysis, the small particles (100 and 400 meshes) of ZVI were more economically favorable for the oxidative conditioning process with ZVI-peroxydisulfate than large ZVI particles (20-40 meshes)
Dan Wang - One of the best experts on this subject based on the ideXlab platform.
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Vegetation successfully prevents Oxidization of sulfide minerals in mine tailings
Journal of Environmental Management, 2016Co-Authors: Jing Zhan, Yang Yang, Dan WangAbstract:Abstract The Oxidization of metal sulfide in tailings causes acid mine drainage. However, it remains unclear whether vegetation prevents the Oxidization of metal sulfides. The Oxidization characteristics and microbial indices of the tailings in the presence of various plant species were investigated to explore the effects of vegetation on the Oxidization of sulfide minerals in tailings. The pH, reducing sulfur, free iron oxides (Fed), chemical oxygen consumption (COC) and biological oxygen consumption (BOC) were measured. Key iron- and sulfur-oxidizing bacteria (Acidithiobacillus spp., Leptospirillum spp. and Thiobacillus spp.) were quantified using real-time PCR. The results indicate that vegetation growing on tailings can effectively prevent the Oxidization of sulfide minerals in tailings. A higher pH and reducing-sulfur content and lower Fed were observed in the 0–30 cm depth interval in the presence of vegetation compared to bare tailings (BT). The COC gradually decreased with depth in all of the soil profiles; specifically, the COC rapidly decreased in the 10–20 cm interval in the presence of vegetation but gradually decreased in the BT profiles. Imperata cylindrica (IC) and Chrysopogon zizanoides (CZ) profiles contained the highest BOC in the 10–20 cm interval. The abundance of key iron- and sulfur-oxidizing bacteria in the vegetated tailings were significantly lower than in the BT; in particular, IC was associated with the lowest iron- and sulfur-oxidizing bacterial abundance. In conclusion, vegetation successfully prevented the Oxidization of sulfide minerals in the tailings, and Imperata cylindrica is the most effective in reducing the number of iron- and sulfur-oxidizing bacteria and helped to prevent the Oxidization of sulfide minerals in the long term.
Cong Huang - One of the best experts on this subject based on the ideXlab platform.
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microbial community structure and function in response to the shift of sulfide nitrate loading ratio during the denitrifying sulfide removal process
Bioresource Technology, 2015Co-Authors: Cong Huang, Zhiling Li, Fan Chen, Youkang Zhao, Jizhong Zhou, Aijie WangAbstract:Influence of acetate-C/NO3-N/S-2 ratio to the functional microbial community during the denitrifying sulfide removal process is poorly understood. Here, phylogenetic and functional bacterial community for elemental sulfur (S-0) recovery and nitrate (NO3) removal were investigated with the switched S-2 /NO3 molar ratio ranged from 5/2 to 5/9. Optimized S-2 /NO3 ratio was evaluated as 5/6, with the bacterial genera predominated with Thauera, Enterobacter, Thiobacillus and Stappia, and the sqr gene highly expressed. However, insufficient or high loading of acetate and NO3 resulted in the low S-0 recovery, and also significantly modified the bacterial community and genetic activity. With S-2 /NO3 ratio of 5/2, autotrophic S-2 Oxidization genera were dominated and NO3 reduction activity was low, confirmed by the low expressed nirK gene. In contrast, S-2 /NO3 ratio switched to 5/8 and 5/9 introduced diverse heterotrophic nitrate reduction and S-0 over Oxidization genera in accompanied with the highly expressed nirK and sox genes. (C) 2015 Published by Elsevier Ltd.
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microbial community structure and function in response to the shift of sulfide nitrate loading ratio during the denitrifying sulfide removal process
Bioresource Technology, 2015Co-Authors: Cong Huang, Fan Chen, Youkang Zhao, Jizhong Zhou, Aijie Wang, Qian LiuAbstract:Influence of acetate-C/NO3(-)-N/S(2-) ratio to the functional microbial community during the denitrifying sulfide removal process is poorly understood. Here, phylogenetic and functional bacterial community for elemental sulfur (S(0)) recovery and nitrate (NO3(-)) removal were investigated with the switched S(2-)/NO3(-) molar ratio ranged from 5/2 to 5/9. Optimized S(2-)/NO3(-) ratio was evaluated as 5/6, with the bacterial genera predominated with Thauera, Enterobacter, Thiobacillus and Stappia, and the sqr gene highly expressed. However, insufficient or high loading of acetate and NO3(-) resulted in the low S(0) recovery, and also significantly modified the bacterial community and genetic activity. With S(2-)/NO3(-) ratio of 5/2, autotrophic S(2-) Oxidization genera were dominated and NO3(-) reduction activity was low, confirmed by the low expressed nirK gene. In contrast, S(2-)/NO3(-) ratio switched to 5/8 and 5/9 introduced diverse heterotrophic nitrate reduction and S(0) over Oxidization genera in accompanied with the highly expressed nirK and sox genes.
