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30 results on '"Sheng, Yuxing"'

28. Analysis of a diverse bacterial community and degradation of organic compounds in a bioprocess for coking wastewater treatment

Author

Meng, Xiaojun, Li, Haibo, Sheng, Yuxing, Cao, Hongbin, and Zhang, Yuxiu

Abstract

AbstractCoking wastewater is one of the most toxic industrial effluents since it contains high concentration of toxic organic compounds. Biological treatments are widely applied in coking wastewater treatment, pollutants can be degraded completely due to the synergistic effect of the community composition. In this study, the community structure and degradation of organic compounds of a full-scale coking wastewater treatment plant with anaerobic, anoxic, and oxic process (A1/A2/O) were studied. GC-MS results showed that phenols, indole, quinoline and pyridine, accounting for 61.70, 13.63, 7.71 and, 2.30%, respectively, were the main organic pollutants in the raw coking wastewater. Those pollutants were degraded gradually during the A1/A2/O bioprocess, respectively. High throughput pyrosequencing was applied to investigate the bacterial community, the sequences could be affiliated to 21 phylogenetic groups, including Proteobacteria, Chloroflexi, Bacteroidetes, Planctomycetes, Synergistetes, Chlorobi, Acidobacteria, Nitrospira, Firmicutes, and Actinobacteria. Diversity and richness indexes, venn analysis and principal component analysis indicated that the diversity and abundance of species in three samples were different. The abundance of the phylum Proteobacteriaaccounted for 84.64% (A1), 62.73% (A2), and 83.24% (O) of the total reads, respectively. The corresponding most dominant orders in three samples were Pseudomonadales(A1), Syntrophobacterales(A2), and Burkholderiales(O), respectively. While genus Pseudomonas, Desulfoglaeba, and Diaphorobacterwas the dominant bacterium in three samples, respectively.

Published
2016
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29. Mechanisms of Cu migration, recovery and detoxification in Cu -, -containing wastewater treatment process with anaerobic granular sludge.

Author

Cao, Xiaolei, Cao, Hongbin, Sheng, Yuxing, Xie, Yongbing, Zhang, Kai, Zhang, Yi, and Crittenden, John C.

Subjects
COPPER research, SULFATES, X-ray diffraction, COVELLITE, BACTERIA
Abstract

In this study, anaerobic granular sludge with sulphate-reducing bacteria (SRB) was applied to treat Cu2+-,-containing wastewater in an expanded granular sludge bed reactor. The migration and enrichment of copper in anaerobic granular sludge were envaluated. By analysing the sludge with X-ray diffraction, copper was determined to be present as covellite (CuS) in the sludge. Observations at the microscopic level showed that CuS precipitates were absorbed onto granules and gradually migrated from the outer to the interior layer of the granule over time and finally accumulated in the core of the granular sludge. Because of the migration of the CuS precipitates and the protection of the extracellular polymeric substances matrix, SRB were able to tolerate copper concentrations up to 10 mg/L. A copper removal efficiency of about 96% was observed at a steady state for 3 months, and copper was enriched in the granular sludge. [ABSTRACT FROM PUBLISHER]

Published
2014
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30. Mechanisms of Cu2+ migration, recovery and detoxification in Cu2+-, SO4(2-) -containing wastewater treatment process with anaerobic granular sludge.

Author

Cao X, Cao H, Sheng Y, Xie Y, Zhang K, Zhang Y, and Crittenden JC

Subjects
Anaerobiosis, Bioreactors, Polysaccharides chemistry, Proteins chemistry, Sewage, Sulfates chemistry, Copper isolation & purification, Sulfates metabolism, Water Pollutants, Chemical isolation & purification, Water Purification
Abstract

In this study, anaerobic granular sludge with sulphate-reducing bacteria (SRB) was applied to treat Cu2+-, SO4(2-) -containing wastewater in an expanded granular sludge bed reactor. The migration and enrichment of copper in anaerobic granular sludge were envaluated. By analysing the sludge with X-ray diffraction, copper was determined to be present as covellite (CuS) in the sludge. Observations at the microscopic level showed that CuS precipitates were absorbed onto granules and gradually migrated from the outer to the interior layer of the granule over time and finally accumulated in the core of the granular sludge. Because of the migration of the CuS precipitates and the protection of the extracellular polymeric substances matrix, SRB were able to tolerate copper concentrations up to 10 mg/L. A copper removal efficiency of about 96% was observed at a steady state for 3 months, and copper was enriched in the granular sludge.

Published
2014
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