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  1. Article: Alternating nitrogen feeding strategy induced aerobic granulation: Influencing conditions and mechanism.

    Wan, Chunli / Li, Zhengwen / Shen, Yanggui / Liu, Xiang

    Journal of environmental sciences (China)

    2021  Volume 109, Page(s) 135–147

    Abstract: Effective cultivation of stable aerobic granular sludge (AGS) is a crucial step in the successful application of this technology, and the formation of AGS could be facilitated by some environmental stress conditions. Four identical sequencing batch ... ...

    Abstract Effective cultivation of stable aerobic granular sludge (AGS) is a crucial step in the successful application of this technology, and the formation of AGS could be facilitated by some environmental stress conditions. Four identical sequencing batch reactors (SBRs) were established to investigate the aerobic granulation process under the same alternating ammonia nitrogen feeding strategy superimposed with different environmental conditions (inorganic carbon source, temperature, N/COD). Although various superimposed conditions induced a significant difference in the size, settling velocity, mechanic strength of AGS, mature aerobic granules could be successfully obtained in all four reactors after 70 days' operation, indicating the alternating ammonia nitrogen feeding strategy was the most critical factor for AGS formation. Based on the results of redundancy analysis, the presence of an inorganic carbon source could facilitate the cultivation of AGS with nitrification function, while the moderate temperature and fluctuant N/COD might benefit the cultivation of more stable AGS. In addition, superimposed stress conditions could result in the difference in the microbial population between four reactors, but the population diversity and abundance of microorganisms were not the determinants of AGS formation. This study provided an effective method for the cultivation of AGS by using alternating ammonia nitrogen feeding strategy.
    MeSH term(s) Aerobiosis ; Bioreactors ; Nitrogen ; Sewage ; Waste Disposal, Fluid
    Chemical Substances Sewage ; Nitrogen (N762921K75)
    Language English
    Publishing date 2021-04-24
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1092300-7
    ISSN 1878-7320 ; 1001-0742
    ISSN (online) 1878-7320
    ISSN 1001-0742
    DOI 10.1016/j.jes.2021.03.044
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 7630: Show issues

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  2. Article: Alternating nitrogen feeding strategy induced aerobic granulation: Influencing conditions and mechanism

    Wan, Chunli / Li, Zhengwen / Shen, Yanggui / Liu, Xiang

    Journal of environmental sciences (China). 2021 Nov., v. 109

    2021  

    Abstract: Effective cultivation of stable aerobic granular sludge (AGS) is a crucial step in the successful application of this technology, and the formation of AGS could be facilitated by some environmental stress conditions. Four identical sequencing batch ... ...

    Abstract Effective cultivation of stable aerobic granular sludge (AGS) is a crucial step in the successful application of this technology, and the formation of AGS could be facilitated by some environmental stress conditions. Four identical sequencing batch reactors (SBRs) were established to investigate the aerobic granulation process under the same alternating ammonia nitrogen feeding strategy superimposed with different environmental conditions (inorganic carbon source, temperature, N/COD). Although various superimposed conditions induced a significant difference in the size, settling velocity, mechanic strength of AGS, mature aerobic granules could be successfully obtained in all four reactors after 70 days' operation, indicating the alternating ammonia nitrogen feeding strategy was the most critical factor for AGS formation. Based on the results of redundancy analysis, the presence of an inorganic carbon source could facilitate the cultivation of AGS with nitrification function, while the moderate temperature and fluctuant N/COD might benefit the cultivation of more stable AGS. In addition, superimposed stress conditions could result in the difference in the microbial population between four reactors, but the population diversity and abundance of microorganisms were not the determinants of AGS formation. This study provided an effective method for the cultivation of AGS by using alternating ammonia nitrogen feeding strategy.
    Keywords ammonium nitrogen ; inorganic carbon ; nitrification ; nitrogen ; sludge ; temperature ; China
    Language English
    Dates of publication 2021-11
    Size p. 135-147.
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1092300-7
    ISSN 1878-7320 ; 1001-0742
    ISSN (online) 1878-7320
    ISSN 1001-0742
    DOI 10.1016/j.jes.2021.03.044
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

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  3. Article: [Spatial Variation and Potential Sources of Microplastics in Rivers in Tongzhou District, Beijing].

    Men, Cong / Li, Di / Zuo, Jian-E / Xing, Wei / Liu, Meng-Yao / Wei, Fan-Qin / Hu, Jia-Min / Xie, Zhen-Wen / Xing, Xin / Shen, Yang-Gui

    Huan jing ke xue= Huanjing kexue

    2022  Volume 43, Issue 7, Page(s) 3656–3663

    Abstract: Microplastics are emerging contaminants, which can also absorb other contaminants, threatening the health of river ecosystems. However, research on the pollution of microplastics in rivers in northern China is still lacking. In this study, based on the ... ...

    Abstract Microplastics are emerging contaminants, which can also absorb other contaminants, threatening the health of river ecosystems. However, research on the pollution of microplastics in rivers in northern China is still lacking. In this study, based on the sampling and analysis of water samples in 19 sites in six rivers in Tongzhou district, Beijing, the composition, spatial variation, and potential sources of microplastics were explored. The results showed that all sites were contaminated by microplastics, and the abundance of microplastics in the Xiaozhong River was the highest among all sites (3.50×10
    MeSH term(s) Beijing ; Ecosystem ; Environmental Monitoring/methods ; Microplastics ; Plastics/analysis ; Rivers ; Spatial Analysis ; Water Pollutants, Chemical/analysis
    Chemical Substances Microplastics ; Plastics ; Water Pollutants, Chemical
    Language Chinese
    Publishing date 2022-07-05
    Publishing country China
    Document type Journal Article
    ISSN 0250-3301
    ISSN 0250-3301
    DOI 10.13227/j.hjkx.202110130
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Microstructural strength deterioration of aerobic granule sludge under organic loading swap.

    Wan, Chunli / Shen, Yanggui / Chen, Si / Liu, Xiang / Liu, Guangmin / Lai, Juin-Yih / Lee, Duu-Jong

    Bioresource technology

    2016  Volume 221, Page(s) 671–676

    Abstract: This study revealed that the gross indicators commonly adopted for monitoring the performance of aerobic granular sludge processes are not capable of probing the microstructural deterioration of granule interior upon organic loading swaps. These granules ...

    Abstract This study revealed that the gross indicators commonly adopted for monitoring the performance of aerobic granular sludge processes are not capable of probing the microstructural deterioration of granule interior upon organic loading swaps. These granules subjected to loading swaps retained their global characteristics: appearances, sizes and settling velocities, chemical oxygen demand (COD) and ammonia-nitrogen removal capacities. However, the granule interior strength, as determined by ultrasound method, was largely weakened upon COD switch-off and was not recovered in the subsequent COD re-supply stage. In response to COD switch-off, the 5.6kDa polysaccharides component of granule extracellular polymeric substances (EPS) was diminished. Correspondingly, two bacterial species, Thauera and Sphingomonas sp., were faded away together with the significant decline in contents of intracellular cyclic dimeric GMP (c-di-GMP). The microstructural integrity of granules was seriously deteriorated upon COD switch-off, which was not detectable by the commonly adopted gross indicators.
    MeSH term(s) Aerobiosis ; Biological Oxygen Demand Analysis ; Bioreactors/microbiology ; Cyclic GMP/analogs & derivatives ; Cyclic GMP/metabolism ; Homoserine/analogs & derivatives ; Homoserine/metabolism ; Lactones/metabolism ; Microbial Consortia/physiology ; Polysaccharides/metabolism ; Sewage/chemistry ; Sewage/microbiology ; Waste Disposal, Fluid/instrumentation ; Waste Disposal, Fluid/methods
    Chemical Substances Lactones ; N-octanoylhomoserine lactone ; Polysaccharides ; Sewage ; bis(3',5')-cyclic diguanylic acid (61093-23-0) ; Homoserine (6KA95X0IVO) ; Cyclic GMP (H2D2X058MU)
    Language English
    Publishing date 2016-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 1065195-0
    ISSN 1873-2976 ; 0960-8524
    ISSN (online) 1873-2976
    ISSN 0960-8524
    DOI 10.1016/j.biortech.2016.09.056
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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