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In-situ sludge reduction based on Mn^(2+)-catalytic ozonation conditioning:Feasibility study and microbial mechanisms

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Journal of Environmental Sciences 2024年第1期135卷 185-197页

作者： Haozhe Huang Tingting Wei Hui Wang Bing Xue Sisi Chen Xiankai Wang Haibin Wu Bin Dong Zuxin Xu College of Environmental Science and Engineering Tongji UniversityShanghai 200092China YANGTZE Eco-Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China

To improve the sludge conditioning efficiency without increasing the ozone dose,an in-situ sludge reduction process based on Mn^(2+)-catalytic ozonation conditioning was *** ozone conditioning alone as a control,a lab-scale sequencing batch reactor coupled with ozonated sludge recycle was evaluated for its operating performance at an ozone dose of 75 mg O_(3)/g VSS and 1.5 mmol/L Mn^(2+)*** results showed a 39.4%reduction in MLSS and an observed sludge yield of 0.236 kg MLSS/kg COD for the O_(3)+Mn^(2+)group compared to the O_(3)group (15.3%and 0.292 kg MLSS/kg COD),accompanied by better COD,NH_(4)^(+)-N,TN and TP removal,improved effluent SS and limited impact on excess sludge ***,activity tests,BIOLOG ECO microplates and 16S rRNA sequencing were applied to elucidate the changing mechanisms of Mn^(2+)-catalytic ozonation related to microbial action:(1) Dehydrogenase activity reached a higher peak.(2) Microbial utilization of total carbon sources had an elevated effect,up to approximately 18%,and metabolic levels of six carbon sources were also increased,especially for sugars and amino acids most pronounced.(3) The abundance of Defluviicoccus under the phylum Proteobacteria was enhanced to 12.0%and dominated in the sludge,they had strong hydrolytic activity and metabolic *** bacteria of the genus Ferruginibacter also showed an abundance of 7.6%,they contributed to the solubilization and reduction of sludge *** results could guide researchers to further reduce ozonation conditioning costs,improve sludge management and provide theoretical support.

关键词： Activated sludge In-situ reduction Catalytic ozonation conditioning Dehydrogenase activity carbon source utilization Microbial community

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Influence of CO_(2)/HCO_(3)^(-) on Microbial Communities in Two Karst Caves with High CO_(2)

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Journal of Earth Science 2023年第1期34卷 145-155页

作者： Jiyu Chen Qiang Li Qiufang He Heinz C.Schroder Zujun Lu Daoxian Yuan Key Laboratory of Karst Dynamics MNR&GZARInstitute of Karst GeologyChinese Academy of Geological SciencesGuilin541004China International Research Center on Karst under the Auspices of UNESCO Guilin541004China College of Life Science Guangxi Normal UniversityGuilin541006China Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of EducationGuilin541004China School of Geographical Sciences Southwest UniversityChongqing400715China Institute for Physiological Chemistry University Medical Center of Johannes Gutenberg UniversityMainz55128Germany

There is limited knowledge about microbial communities and their ecological functions in karst caves with high CO_(2)***,we studied the microbial community compositions and functions in Shuiming Cave( "SMC",CO_(2)concentration 3 303 ppm) and Xueyu Cave( "XYC",CO_(2)concentration 8 753 ppm) using Illumina MiSeq high-throughput sequencing in combination with BIOLOG *** results showed that Proteobacteria,Actinobacteria and Bacteroidetes were dominant phyla in these two caves,and Thaumarchaeota was the most abundant in the rock wall samples of *** microbial diversity in the water samples decreased with increasing HCO_(3)^(-)concentration,and it was higher in XYC than that in *** microbial community structures in the sediment and rock wall samples were quite different between the two *** concentrations of CO_(2)can reduce the microbial diversity on the rock walls in karst caves,probably through changing microbial preference for different types of carbon sources and decreasing the microbial utilization rate of carbon *** results expanded our understanding of microbial community and its response to environments in karst caves with high CO_(2).

关键词： karst cave CO_(2) microbial community composition microbiology function carbon source utilization

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Differences in carbon source usage by dental plaque in children with and without early childhood caries

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International Journal of Oral Science 2017年第4期9卷 232-237页

作者： yan zhao wen-jie zhong zhe xun qian zhang ye-qing song yun-song liu feng chen the second dental center peking university school and hospital of stomatologyBeijingChina central laboratory peking university school and hospital of stomatologynational engineering laboratory for digital and material technology of stomatologybeijing key laboratory of digital stomatologyBeijingChina department of prosthodontics peking university school and hospital of stomatologyBeijingChina

Early childhood caries （ECC） is a considerable pediatric and public health problem worldwide. Preceding studies have focused primarily on bacterial diversity at the taxonomic level. Although these studies have provided significant information regarding the connection between dental caries and oral micmbiomes, further comprehension of this microbial community＇s ecological relevance is limited. This study identified the carbon source metabolic differences in dental plaque between children with and without ECC. We compared the microbial community functional diversity in 18 caries-free subjects with 18 severe ECC patients based on sole carbon source usage using a Biolog assay. The anaerobic microbial community in the ECC patients displayed greater metabolic activity than that of the control group. Specific carbon source metabolism differed significantly between the two groups. Subjects from the two groups were well distinguished by cluster and principal component analyses based on discriminative carbon sources. Our results implied that the microbial functional diversity between the ECC patients and healthy subjects differed significantly. In addition, the Biolog assay furthered our understanding of oral microbiomes as a composite of functional abilities, thus enabling us to identify the ecologically relevant functional differences among oral microbial communities.

关键词： Biolog assay carbon source utilization early childhood caries microbial community

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Functional diversity of soil microbial communities in response to supplementing 50% of the mineral N fertilizer with organic fertilizer in an oat field

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Journal of Integrative Agriculture 2021年第8期20卷 2255-2264页

作者： ZHANG Mei-jun JIA Ju-qing LU Hua FENG Mei-chen YANG Wu-de College of Agriculture Shanxi Agricultural UniversityTaigu 030801P.R.China

The effects of supplementing 50%of the mineral N fertilizer with organic fertilizer on the metabolism and diversity of soil microbial communities in an oat field were investigated using Biolog-Eco *** experiment consisted of five treatments:no fertilizer(CK),mineral N fertilizer applied at 90 and 45 kg ha^(-1) N in the form of urea(U1 and U2,respectively),and U2 supplemented with organic fertilizer in the form of sheep manure at 90 and 45 kg ha^(-1) N(U2OM1 and U2OM2,respectively).Each treatment had three *** experiment was conducted in 2018 and 2019 in Pinglu District,Shanxi Province,*** carbon source utilization by soil microbial communities,such as amino acids,amines,carbohydrates,carboxylic acids,and polymers,increased when 50%of the mineral N fertilizer was replaced with organic fertilizer in both *** result was accompanied by increased richness,dominance,and evenness of the microbial *** utilization of amino acid,amine,and carboxylic acid carbon sources and community evenness were further improved when the organic fertilizer amount was doubled in both *** analysis indicated that amines and amino acids were the most representative of the total carbon source utilization by the soil microbial communities in both *** highest oat yield was achieved at a total N application rate of 135 kg ha^(-1) in the treatment involving 45 kg ha^(-1) N in the form of urea and 90 kg ha^(-1) N in the form of sheep manure in both *** was concluded that the application of 50%of the conventional rate of mineral N fertilizer supplemented with an appropriate rate of organic fertilizer enhanced both the functional diversity of soil microbial communities and oat *** and amino acid carbon sources may be used as a substitute for total carbon sources for assessing total carbon source utilization by soil microbial communities in oat fields in future studies.

关键词： organic fertilizer Biolog-Eco soil microbial community carbon source utilization diversity oats

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Vertical variation in Vibrio community composition in Sansha Yongle Blue Hole and its ability to degrade macromolecules

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Marine Life Science & Technology 2020年第1期2卷 60-72页

作者： Bei Li Jiwen Liu Shun Zhou Liang Fu Peng Yao Lin Chen Zuosheng Yang Xiaolei Wang Xiao-Hua Zhang College of Marine Life Sciences Ocean University of China5 Yushan RoadQingdao 266003China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Sansha Track Ocean Coral Reef Conservation Research Institute Sansha 573199China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education/Institute for Advanced Ocean StudyOcean University of ChinaQingdao 266100China College of Marine Geosciences Ocean University of China.Qingdao 266100China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China

With the advantages of wide distribution,fast growth,and broad metabolic spectrum to organic carbon compounds,Vibrio may play an important role in organic carbon ***,the ecological roles of Vibrio in many marine environments have not been ***,the world's deepest'blue hole',the Sansha Yongle Blue Hole(SYBH)in the South China Sea,which is a geographically semi-enclosed environment featuring unique chemical characters,was *** abundance,diversity and carbon source utilization capability of Vibrio were studied by quantification and high-throughput sequencing of Vibrio specific 16S rRNA genes and cultivation *** abundance of Vibrio in water column of the SYBH ranged from 3.78×10^4 to 7.35×10^616S rRNA gene copies L_***-living Vibrio was more abundant than particle-associated Vibrio(~1.20×10^6 versus-2.68×10^5 gene copies L_1),indicating that Vibrio prefers a free-living life *** Vibrio assemblages showed clear vertical stratification and could be divided into three groups:aerobic-transition,middle anaerobic and bottom anaerobic *** oxygen(DO),temperature,pH and salinity were the main environmental factors affecting the abundance and community *** Vibrio demonstrated a degrading capability to various macromolecular substrates,including starch,Tween 20/40/80,DNA,gelatin,alginate,casein,chitin,lecithin,K-carrageenan,mannan,xylan and hyaluronic *** suggests that Vibrio could produce a variety of highly active extracellular *** study provides new insights into the distribution pattern and possible role in carbon cycle of Vibrio in the unique environment of a"blue hole'.

关键词： Vibrio community Vertical stratification carbon source utilization Sansha Yongle Blue Hole

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