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  1. Article ; Online: Impact of sulfamethoxazole and organic supplementation on mixotrophic denitrification process: Nitrate removal efficiency and the response of functional microbiota.

    Chen, Yue / Zhao, Yang-Guo / Wang, Xiao / Ji, Junyuan

    Journal of environmental management

    2022  Volume 320, Page(s) 115818

    Abstract: Recirculating aquaculture systems (RAS) effluent is characterized by low COD to total inorganic nitrogen ratio (C/N), excessive nitrate, and the presence of traces of antibiotics. Hence, it urgently needs to be treated before recycling or discharging. In ...

    Abstract Recirculating aquaculture systems (RAS) effluent is characterized by low COD to total inorganic nitrogen ratio (C/N), excessive nitrate, and the presence of traces of antibiotics. Hence, it urgently needs to be treated before recycling or discharging. In this study, four denitrification bioreactors at increasing C/N ratios (0, 0.7, 2, and 5) were started up to treat mariculture wastewater under the sulfamethoxazole (SMX) stress, during which the bioreactors performance and the shift of mixotrophic microbial communities were explored. The result showed that during the SMX exposure, organic supplementation enhanced nitrate and thiosulfate removal, and eliminated nitrite accumulation. The denitrification rate was accelerated by increasing C/N from 0 to 2, while it declined at C/N of 5. The decline was ascribed to which SMX reduced the relative abundance of denitrifiers, but improved the capability of dissimilatory nitrogen reduction to ammonia (DNRA) and sulfide production. The direct evidence was the relative abundance of sulfidogenic populations, such as Desulfuromusa, Desulfurocapsa, and Desulfobacter increased under the SMX stress. Moreover, high SMX (1.5 mg L
    MeSH term(s) Ammonia ; Bioreactors ; Denitrification ; Dietary Supplements ; Microbiota ; Nitrates ; Nitrogen ; Nitrogen Oxides ; Sulfamethoxazole ; Sulfides
    Chemical Substances Nitrates ; Nitrogen Oxides ; Sulfides ; Ammonia (7664-41-7) ; Sulfamethoxazole (JE42381TNV) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2022-08-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2022.115818
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  2. Article: Effect of external carbon addition and enrofloxacin on the denitrification and microbial community of sequencing batch membrane reactor treating synthetic mariculture wastewater

    Zhang, Xue / Jin, Chunji / Gu, Baiming / Ji, Junyuan / Zhao, Yangguo / Gao, Mengchun / She, Zonglian

    Journal of environmental management. 2022 Dec. 01, v. 323

    2022  

    Abstract: The effect of sequencing batch membrane bioreactor (SMBR) on external carbon addition and enrofloxacin was investigated to treat synthetic mariculture wastewater. Anoxic/anaerobic and low COD/TN can improve the ammonia oxidation of the system, and the NH₄ ...

    Abstract The effect of sequencing batch membrane bioreactor (SMBR) on external carbon addition and enrofloxacin was investigated to treat synthetic mariculture wastewater. Anoxic/anaerobic and low COD/TN can improve the ammonia oxidation of the system, and the NH₄⁺-N removal efficiency above 99%. External carbon was added and an anoxic environment was set to provide a suitable environment for denitrifying bacteria. When the external carbon source was 50–207 mg/L, the TN removal efficiency (31.82%–37.73%) and the COD of the effluent (28.85–36.58 mg/L) had little change. The partition resistance model showed that cake deposition resistance (RC,ᵢᵣᵣ) and irreversible resistance (RPB) were the main components. And with the increase in cleaning times, the fouling rate of membrane components accelerated. Enrofloxacin can promote the TN removal efficiency (45.66%–93.74%) and had a significant effect on TM7a, Cohaesibacter, Vibrio and Phaeobacter.
    Keywords Vibrio ; ammonia ; anaerobic conditions ; carbon ; denitrification ; enrofloxacin ; environmental management ; mariculture ; membrane bioreactors ; microbial communities ; models ; oxidation ; wastewater
    Language English
    Dates of publication 2022-1201
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2022.116155
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  3. Article: Impact of sulfamethoxazole and organic supplementation on mixotrophic denitrification process: Nitrate removal efficiency and the response of functional microbiota

    Chen, Yue / Zhao, Yang-Guo / Wang, Xiao / Ji, Junyuan

    Journal of environmental management. 2022 Oct. 15, v. 320

    2022  

    Abstract: Recirculating aquaculture systems (RAS) effluent is characterized by low COD to total inorganic nitrogen ratio (C/N), excessive nitrate, and the presence of traces of antibiotics. Hence, it urgently needs to be treated before recycling or discharging. In ...

    Abstract Recirculating aquaculture systems (RAS) effluent is characterized by low COD to total inorganic nitrogen ratio (C/N), excessive nitrate, and the presence of traces of antibiotics. Hence, it urgently needs to be treated before recycling or discharging. In this study, four denitrification bioreactors at increasing C/N ratios (0, 0.7, 2, and 5) were started up to treat mariculture wastewater under the sulfamethoxazole (SMX) stress, during which the bioreactors performance and the shift of mixotrophic microbial communities were explored. The result showed that during the SMX exposure, organic supplementation enhanced nitrate and thiosulfate removal, and eliminated nitrite accumulation. The denitrification rate was accelerated by increasing C/N from 0 to 2, while it declined at C/N of 5. The decline was ascribed to which SMX reduced the relative abundance of denitrifiers, but improved the capability of dissimilatory nitrogen reduction to ammonia (DNRA) and sulfide production. The direct evidence was the relative abundance of sulfidogenic populations, such as Desulfuromusa, Desulfurocapsa, and Desulfobacter increased under the SMX stress. Moreover, high SMX (1.5 mg L⁻¹) caused the obvious accumulation of ammonia at C/N of 5 due to the high concentration of sulfide (3.54 ± 1.08 mM) and the enhanced DNRA process. This study concluded that the mixotrophic denitrification process with the C/N of 0.7 presented the best performance in nitrate and sulfur removal and indicated the maximum resistance to SMX.
    Keywords Desulfobacter ; Desulfuromusa ; ammonia ; bioreactors ; denitrification ; denitrifying microorganisms ; mariculture ; nitrates ; nitrites ; nitrogen ; sulfamethoxazole ; sulfides ; sulfur ; thiosulfates ; wastewater
    Language English
    Dates of publication 2022-1015
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2022.115818
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  4. Article: Nitrogen and sulfamethoxazole removal in a partially saturated vertical flow constructed wetland treating synthetic mariculture wastewater

    Chen, Jinjin / Gao, Mengchun / Zhao, Yangguo / Guo, Liang / Jin, Chunji / Ji, Junyuan / She, Zonglian

    Bioresource technology. 2022 Aug., v. 358

    2022  

    Abstract: This study investigated the removal of nitrogen and sulfamethoxazole (SMX), and the microbial communities in a partially saturated vertical flow constructed wetland (PS-VFCW) fed with synthetic mariculture wastewater operated at different saturated zone ... ...

    Abstract This study investigated the removal of nitrogen and sulfamethoxazole (SMX), and the microbial communities in a partially saturated vertical flow constructed wetland (PS-VFCW) fed with synthetic mariculture wastewater operated at different saturated zone depths (SZDs), i.e. 51, 70, and 60 cm. Removal efficiencies were 99.8%-100.0% for COD, 34.1%-100.0% for NH₄⁺-N, 67.8%-97.3% for total inorganic nitrogen (TIN), and 29.8%-57.2% for SMX. Excellent nitrification performance was achieved at the SZDs of 51 and 60 cm. Denitrification performed well at 70 and 60 cm SZDs. The highest TIN removal efficiency (97.3%) was achieved as the SZD was 60 cm. SMX removal was significantly influenced by SZD and was promoted by higher SZD. The removal of organics, nitrogen, and SMX mainly occurred in the unsaturated zone. Ammonia-oxidizing bacteria, nitrite-oxidizing bacteria, denitrifying bacteria, and SMX-degrading bacteria were detected in the unsaturated and saturated zones, and showed an increasing trend in abundance along the depth.
    Keywords denitrification ; mariculture ; nitrification ; nitrogen ; sulfamethoxazole ; technology ; wastewater
    Language English
    Dates of publication 2022-08
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1065195-0
    ISSN 1873-2976 ; 0960-8524
    ISSN (online) 1873-2976
    ISSN 0960-8524
    DOI 10.1016/j.biortech.2022.127401
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  5. Article: Comparison on anaerobic phosphorus release and recovery from waste activated sludge by different chemical pretreatment methods: Focus on struvite quality and benefit analysis

    Xu, Haiqing / Guo, Liang / Gao, Mengchun / Zhao, Yangguo / Jin, Chunji / Ji, Junyuan / She, Zonglian

    Science of the total environment. 2022 June 15, v. 825

    2022  

    Abstract: Phosphorus recovery from waste activated sludge (WAS) is expected to alleviate the shortage of phosphate rock and reduce eutrophication. In this study, acid, alkali and sodium polyacrylate (PAAS) were compared to enhance phosphorus release and recovery ... ...

    Abstract Phosphorus recovery from waste activated sludge (WAS) is expected to alleviate the shortage of phosphate rock and reduce eutrophication. In this study, acid, alkali and sodium polyacrylate (PAAS) were compared to enhance phosphorus release and recovery from WAS. During anaerobic fermentation (AF) stage, the optimal pretreated conditions for ortho-phosphate release were the pH of 4 (AF 12 h), 13 (AF 12 h) and 22.4 g PAAS/L (AF 24 h) with the phosphorus release efficiencies of 40.9%, 62.6% and 31.7%, respectively. Acid, alkali and PAAS addition were beneficial for apatite phosphorus (AP), non-apatite inorganic phosphorus (NAIP) and organic phosphorus (OP) release from WAS, respectively. Strong acidic (pH = 4) and alkaline (pH = 12 and 13) conditions inhibited the release of soluble ammonia, while PAAS would not have a negative impact on the release of soluble ammonia. By means of precipitation crystallization, the ortho-phosphate could be almost recovered after acid/alkali pretreatment compared with PAAS (88.9%) at optimal Mg/P molar ratio of 1.5:1. The XRD, FT-IR and SEM-EDX analyses confirmed the main component in the product was struvite. The purity of the struvite in the product recovered from acid (named PreAC, 78.9%) and alkali (named PreAL, 89.6%) pretreated sludge were higher than that of the PAAS (named PrePA, 72.3%) by elemental analysis. The mercury and chromium content existed in PreAC were above the Control Standards of Pollutants in Sludge for Agricultural Use, whereas detected heavy metal elements level of the PreAL and PrePA were below the standard. By means of cost analysis, acid/alkali pretreatment could obtain economic benefits compared with PAAS. Thus, those discoveries would broaden the phosphorus recovery way to serve in practice.
    Keywords activated sludge ; alkali treatment ; ammonia ; apatite ; chromium ; cost analysis ; crystallization ; environment ; eutrophication ; fermentation ; heavy metals ; inorganic phosphorus ; magnesium ammonium phosphate ; mercury ; organic phosphorus ; pH ; polyacrylic acid ; rock phosphate ; sodium
    Language English
    Dates of publication 2022-0615
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2022.154110
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  6. Article: Insight in degradation of tetracycline in mariculture wastewater by ultraviolet/persulfate advanced oxidation process

    Zhang, Yanan / Zhao, Yang-Guo / Hu, Yubo / Gao, Mengchun / Guo, Liang / Ji, Junyuan

    Environmental research. 2022 Sept., v. 212

    2022  

    Abstract: The direct discharge of trace amounts of antibiotics in mariculture wastewater results in adverse effect on the ecological environment of receiving waters. Hence, the degradation of tetracycline (TC) in mariculture wastewater by the ultraviolet/ ... ...

    Abstract The direct discharge of trace amounts of antibiotics in mariculture wastewater results in adverse effect on the ecological environment of receiving waters. Hence, the degradation of tetracycline (TC) in mariculture wastewater by the ultraviolet/peroxydisulfate (UV/PS) process was investigated in this study. The results revealed that 95.73% removal of TC with 5 mg/L dosage was achieved after 30 min UV/PS treatment. Chloride ion (Cl⁻) in mariculture wastewater slightly inhibited TC degradation by scavenging free radicals. Comparably, bromine ion (Br⁻) significantly enhanced the removal of TC and even doubled the degradation rate. Reactive bromine species (RBS) made a major contribution to the TC removal, followed by free chlorine and other reactive chlorine species (RCS). The TC degradation pathway revealed that functional group shedding and ring-opening reactions occurred successively. In addition, TC mineralization rate was low within 30 min, causing the inefficient reduction of acute toxicity of TC and its intermediates, which could be improved by optimizing the process parameters. These results indicated that UV/PS is a new alternative process for the harmless treatment of mariculture wastewater containing the antibiotics.
    Keywords acute toxicity ; adverse effects ; bromine ; chlorides ; chlorine ; mariculture ; mineralization ; oxidation ; research ; tetracycline ; wastewater
    Language English
    Dates of publication 2022-09
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.113324
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  7. Article: Specific affinity and relative abundance of methanogens in acclimated anaerobic sludge treating low-strength wastewater

    Hou, Liyuan / Griswold, Nick / Ji, Junyuan / Hu, Zhiqiang

    Applied microbiology and biotechnology. 2020 Jan., v. 104, no. 1

    2020  

    Abstract: Kinetic parameters affecting effluent water quality including half saturation constant (Ks), maximum specific growth rate (μmax), and specific affinity ([Formula: see text], defined as μmax/Ks) were investigated using three types of anaerobic sludge (raw ...

    Abstract Kinetic parameters affecting effluent water quality including half saturation constant (Ks), maximum specific growth rate (μmax), and specific affinity ([Formula: see text], defined as μmax/Ks) were investigated using three types of anaerobic sludge (raw anaerobic digestion sludge referred to as unacclimated sludge, unacclimated sludge after endogenous decay, and sludge acclimated to low-strength wastewater in an anaerobic membrane bioreactor (AnMBR) for 360 days). Long-term acclimation to low-strength wastewater resulted in sludge with high specific affinity (1.6 × 10−3 L/mg COD/day for acclimated sludge compared to 4.1 × 10−4 L/mg COD/day for unacclimated sludge). The μmax values for unacclimated sludge and acclimated sludge were 0.08 and 0.07 day−1, respectively. The Ks values for unacclimated sludge and acclimated sludge were 194 ± 81 mg COD/L and 45 ± 13 mg COD/L, respectively. Although the Ks of unacclimated sludge after endogenous decay increased to 772 ± 74 mg COD/L, μmax increased to 0.35 day−1 as well, resulting in no statistically significant difference of [Formula: see text] between the two types of unacclimated sludge. Overall, [Formula: see text] is a better indicator than μmax or Ks alone for determining effluent water quality, as effluent substrate concentration is approximately inversely proportional to the specific affinity. 16S rRNA sequencing data analysis indicated a high abundance (85.8% of total archaea) of Methanosaeta in the microbial community after long-term acclimation. High [Formula: see text] associated with the enrichment of Methanosaeta appears to ensure successful anaerobic treatment of low-strength wastewater.
    Keywords Methanosaeta ; acclimation ; anaerobic digestion ; chemical oxygen demand ; membrane bioreactors ; methanogens ; microbial communities ; ribosomal RNA ; sequence analysis ; sludge ; specific growth rate ; wastewater ; water quality
    Language English
    Dates of publication 2020-01
    Size p. 291-302.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 392453-1
    ISSN 1432-0614 ; 0171-1741 ; 0175-7598
    ISSN (online) 1432-0614
    ISSN 0171-1741 ; 0175-7598
    DOI 10.1007/s00253-019-10149-x
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  8. Article ; Online: Insight in degradation of tetracycline in mariculture wastewater by ultraviolet/persulfate advanced oxidation process.

    Zhang, Yanan / Zhao, Yang-Guo / Hu, Yubo / Gao, Mengchun / Guo, Liang / Ji, Junyuan

    Environmental research

    2022  Volume 212, Issue Pt B, Page(s) 113324

    Abstract: The direct discharge of trace amounts of antibiotics in mariculture wastewater results in adverse effect on the ecological environment of receiving waters. Hence, the degradation of tetracycline (TC) in mariculture wastewater by the ultraviolet/ ... ...

    Abstract The direct discharge of trace amounts of antibiotics in mariculture wastewater results in adverse effect on the ecological environment of receiving waters. Hence, the degradation of tetracycline (TC) in mariculture wastewater by the ultraviolet/peroxydisulfate (UV/PS) process was investigated in this study. The results revealed that 95.73% removal of TC with 5 mg/L dosage was achieved after 30 min UV/PS treatment. Chloride ion (Cl
    MeSH term(s) Anti-Bacterial Agents ; Bromine ; Chlorine ; Kinetics ; Oxidation-Reduction ; Tetracycline/analysis ; Ultraviolet Rays ; Waste Water ; Water Pollutants, Chemical/analysis ; Water Purification/methods
    Chemical Substances Anti-Bacterial Agents ; Waste Water ; Water Pollutants, Chemical ; Chlorine (4R7X1O2820) ; Tetracycline (F8VB5M810T) ; Bromine (SBV4XY874G)
    Language English
    Publishing date 2022-04-16
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.113324
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  9. Article ; Online: Effect of external carbon addition and enrofloxacin on the denitrification and microbial community of sequencing batch membrane reactor treating synthetic mariculture wastewater.

    Zhang, Xue / Jin, Chunji / Gu, Baiming / Ji, Junyuan / Zhao, Yangguo / Gao, Mengchun / She, Zonglian

    Journal of environmental management

    2022  Volume 323, Page(s) 116155

    Abstract: The effect of sequencing batch membrane bioreactor (SMBR) on external carbon addition and enrofloxacin was investigated to treat synthetic mariculture wastewater. Anoxic/anaerobic and low COD/TN can improve the ammonia oxidation of the system, and the ... ...

    Abstract The effect of sequencing batch membrane bioreactor (SMBR) on external carbon addition and enrofloxacin was investigated to treat synthetic mariculture wastewater. Anoxic/anaerobic and low COD/TN can improve the ammonia oxidation of the system, and the NH
    MeSH term(s) Ammonia ; Bioreactors/microbiology ; Carbon ; Denitrification ; Enrofloxacin ; Microbiota ; Nitrogen ; Waste Disposal, Fluid ; Waste Water
    Chemical Substances Waste Water ; Enrofloxacin (3DX3XEK1BN) ; Carbon (7440-44-0) ; Ammonia (7664-41-7) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2022-09-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2022.116155
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  10. Article ; Online: Comparison on anaerobic phosphorus release and recovery from waste activated sludge by different chemical pretreatment methods: Focus on struvite quality and benefit analysis.

    Xu, Haiqing / Guo, Liang / Gao, Mengchun / Zhao, Yangguo / Jin, Chunji / Ji, Junyuan / She, Zonglian

    The Science of the total environment

    2022  Volume 825, Page(s) 154110

    Abstract: Phosphorus recovery from waste activated sludge (WAS) is expected to alleviate the shortage of phosphate rock and reduce eutrophication. In this study, acid, alkali and sodium polyacrylate (PAAS) were compared to enhance phosphorus release and recovery ... ...

    Abstract Phosphorus recovery from waste activated sludge (WAS) is expected to alleviate the shortage of phosphate rock and reduce eutrophication. In this study, acid, alkali and sodium polyacrylate (PAAS) were compared to enhance phosphorus release and recovery from WAS. During anaerobic fermentation (AF) stage, the optimal pretreated conditions for ortho-phosphate release were the pH of 4 (AF 12 h), 13 (AF 12 h) and 22.4 g PAAS/L (AF 24 h) with the phosphorus release efficiencies of 40.9%, 62.6% and 31.7%, respectively. Acid, alkali and PAAS addition were beneficial for apatite phosphorus (AP), non-apatite inorganic phosphorus (NAIP) and organic phosphorus (OP) release from WAS, respectively. Strong acidic (pH = 4) and alkaline (pH = 12 and 13) conditions inhibited the release of soluble ammonia, while PAAS would not have a negative impact on the release of soluble ammonia. By means of precipitation crystallization, the ortho-phosphate could be almost recovered after acid/alkali pretreatment compared with PAAS (88.9%) at optimal Mg/P molar ratio of 1.5:1. The XRD, FT-IR and SEM-EDX analyses confirmed the main component in the product was struvite. The purity of the struvite in the product recovered from acid (named Pre
    MeSH term(s) Alkalies ; Ammonia ; Anaerobiosis ; Phosphates ; Phosphorus/chemistry ; Sewage ; Spectroscopy, Fourier Transform Infrared ; Struvite/chemistry ; Waste Disposal, Fluid
    Chemical Substances Alkalies ; Phosphates ; Sewage ; Phosphorus (27YLU75U4W) ; Ammonia (7664-41-7) ; Struvite (AW3EJL1462)
    Language English
    Publishing date 2022-02-23
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2022.154110
    Database MEDical Literature Analysis and Retrieval System OnLINE

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