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  1. Article ; Online: Strategies to attenuate ciprofloxacin inhibition on enhanced biological phosphorus removal from wastewater and its recoverability.

    Wang, Ruyi / Lou, Juqing / Cai, Jing

    Journal of environmental management

    2024  Volume 354, Page(s) 120456

    Abstract: The inhibiting effects of ciprofloxacin (CIP) on enhanced biological phosphorus removal (EBPR) were investigated with no change in reactor operation and with increased aeration rate and sludge retention time (SRT) to explore inhibition-alleviating ... ...

    Abstract The inhibiting effects of ciprofloxacin (CIP) on enhanced biological phosphorus removal (EBPR) were investigated with no change in reactor operation and with increased aeration rate and sludge retention time (SRT) to explore inhibition-alleviating solutions. Additionally, performance recoverability was evaluated. The results showed that the phosphorus removal efficiency in the presence of 0.002-0.092 mg/L CIP for 7 days was only 12.5%. Increasing the aeration rate relieved inhibition (33.5% phosphorus removal efficiency on Day 7), and increasing SRT slowed EBPR performance deterioration. The EBPR performance recovered from CIP inhibition and increases in the aeration rate and SRT resulted in different recovery phenomena. The maximum PO
    MeSH term(s) Wastewater ; Ciprofloxacin/pharmacology ; Phosphorus ; Bioreactors/microbiology ; Sewage ; Phosphorus Radioisotopes
    Chemical Substances Wastewater ; Ciprofloxacin (5E8K9I0O4U) ; Phosphorus (27YLU75U4W) ; Sewage ; Phosphorus-33 ; Phosphorus Radioisotopes
    Language English
    Publishing date 2024-02-26
    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.2024.120456
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Iron-mediated DAMO-anammox process: Revealing the mechanism of electron transfer.

    Gao, Ran / Jin, Hao / Han, Mengru / Lou, Juqing

    Journal of environmental management

    2024  Volume 356, Page(s) 120750

    Abstract: The nitrate denitrifying anaerobic methane oxidation-anaerobic ammonia oxidation (DAMO-anammox) can accomplish nitrogen removal and methane ( ... ...

    Abstract The nitrate denitrifying anaerobic methane oxidation-anaerobic ammonia oxidation (DAMO-anammox) can accomplish nitrogen removal and methane (CH
    MeSH term(s) Iron ; Anaerobic Ammonia Oxidation ; Extracellular Polymeric Substance Matrix/metabolism ; Cytochromes c/metabolism ; Electrons ; Denitrification ; Anaerobiosis ; Archaea ; Oxidation-Reduction ; Methane ; Carbon/metabolism ; Riboflavin/metabolism ; Bioreactors ; Ammonium Compounds/metabolism ; Nitrogen/metabolism ; Nitrites/metabolism
    Chemical Substances Iron (E1UOL152H7) ; Cytochromes c (9007-43-6) ; Methane (OP0UW79H66) ; Carbon (7440-44-0) ; Riboflavin (TLM2976OFR) ; Ammonium Compounds ; Nitrogen (N762921K75) ; Nitrites
    Language English
    Publishing date 2024-03-22
    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.2024.120750
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  3. Article ; Online: Interaction between Cr(VI) and Tubificidae in sludge reduction system: effect, reduction, and redistribution of Cr(VI).

    Lou, Juqing / Xu, Hui / Jin, Hao / Cao, Yongqing / Wang, Ruyi

    Environmental science and pollution research international

    2023  Volume 30, Issue 41, Page(s) 94803–94813

    Abstract: The treatment of heavy metals in sewage treatment systems has gained more attention with the increase in heavy metal hazards. Tubificidae in sludge reduction have been widely studied; however, little is known about the effect of Tubificidae in the ... ...

    Abstract The treatment of heavy metals in sewage treatment systems has gained more attention with the increase in heavy metal hazards. Tubificidae in sludge reduction have been widely studied; however, little is known about the effect of Tubificidae in the treatment of Cr-containing wastewater. In this study, the mechanism of Tubificidae in the sludge reduction system with Cr stress was studied. Predation experiments by Tubificidae in a Cr-containing sludge reduction system were conducted to investigate the changes in enzyme activities in the Tubificidae under different concentrations of Cr, and the distribution of Cr in the sludge reduction reactor was analyzed. The kinetic model of uptake and elimination of Cr in Tubificidae was established. The results showed that the maximum activation multiplier factor of superoxide dismutase (SOD) activity was 1.95 under the low concentration of Cr(VI), which indicated that Tubificidae had a certain detoxification. After the effect of Tubificidae on Cr(VI) experiments, the Cr concentrations in Tubificidae, sludge, and feces increased first and then decreased with exposure time, and the proportion of total Cr and Cr(VI) in the sludge decreased from 71.98% and 42.7% to 29.18% and 6.82%, respectively. The detoxification mechanism of the Tubificidae could be activated with Cr stress, and 63.22% of the Cr(VI) was converted to Cr(III). The bioconcentration factor (BCF) for theoretical equilibrium was 446, the maximum bioaccumulation factor (BAF) reached 0.97 on the 15th day. It can be seen that Tubificidae could be considered a good scavenger of environmental Cr(VI). The hyperbolic model fits the process of Cr uptake and elimination well and can be used as a predictive tool for Tubificidae accumulation.
    MeSH term(s) Animals ; Sewage ; Wastewater ; Chromium/analysis ; Oligochaeta/physiology
    Chemical Substances Sewage ; chromium hexavalent ion (18540-29-9) ; Wastewater ; Chromium (0R0008Q3JB)
    Language English
    Publishing date 2023-08-04
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-023-29108-1
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  4. Article ; Online: Machine learning-based model construction and identification of dominant factor for simultaneous sulfide and nitrate removal process.

    Gao, Hong / Chen, Bilong / Qaisar, Mahmood / Lou, Juqing / Sun, Yue / Cai, Jing

    Bioresource technology

    2023  Volume 390, Page(s) 129848

    Abstract: Accurate water quality prediction models are essential for the successful implementation of the simultaneous sulfide and nitrate removal process (SSNR). Traditional models, such as regression and analysis of variance, do not provide accurate predictions ... ...

    Abstract Accurate water quality prediction models are essential for the successful implementation of the simultaneous sulfide and nitrate removal process (SSNR). Traditional models, such as regression and analysis of variance, do not provide accurate predictions due to the complexity of microbial metabolic pathways. In contrast, Back Propagation Neural Networks (BPNN) has emerged as superior tool for simulating wastewater treatment processes. In this study, a generalized BPNN model was developed to simulate and predict sulfide removal, nitrate removal, element sulfur production, and nitrogen gas production in SSNR. Remarkable results were obtained, indicating the strong predictive performance of the model and its superiority over traditional mathematical models for accurately predicting the effluent quality. Furthermore, this study also identified the crucial influencing factors for the process optimization and control. By incorporating artificial intelligence into wastewater treatment modeling, the study highlights the potential to significantly enhance the efficiency and effectiveness of meeting water quality standards.
    MeSH term(s) Nitrates/metabolism ; Artificial Intelligence ; Bioreactors ; Sulfides/metabolism ; Machine Learning ; Nitrogen
    Chemical Substances Nitrates ; Sulfides ; Nitrogen (N762921K75)
    Language English
    Publishing date 2023-10-11
    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.2023.129848
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  5. Article ; Online: Impact Analysis and Mathematical Modeling of Humic Acid on the Denitrification Process in a Nitrite–Denitrifying Anaerobic Methane Oxidation System

    Lv, Jiao / Lou, Juqing / Wang, Ruyi / Jin, Hao / Dai, Mingyang / Hou, Xingzhu / Teng, Caiyue / Xu, Fan

    Water Air Soil Pollut. 2023 Jan., v. 234, no. 1 p.23-23

    2023  

    Abstract: Nitrite–denitrification anaerobic methane oxidation (nitrite–DAMO) bacteria live in deep layers of freshwater sediments such as rivers and lakes. Humic acid (HA) usually exists in soil and sediments and can act as an electron shuttle or terminal electron ...

    Abstract Nitrite–denitrification anaerobic methane oxidation (nitrite–DAMO) bacteria live in deep layers of freshwater sediments such as rivers and lakes. Humic acid (HA) usually exists in soil and sediments and can act as an electron shuttle or terminal electron acceptor to promote the redox biotransformation of metals and organic molecules. To determine the influence of humic acid on the nitrite–DAMO process, batch experiments were conducted to study the denitrification and methane oxidation capabilities of the nitrite–DAMO system under different humic acid concentrations. The results showed that the denitrification and methane oxidation capacity of the system was continuously promoted at 0–750 mg HA/L, reached the best at 750 mg HA/L, and was suppressed at humic acid concentrations higher than 750 mg HA/L. At 750 mg HA/L, the denitrification rate was 1.06 mg N/(L·d), and the methane oxidation rate was 0.68 mg/(L·d). Under the action of 750 mg/L humic acid, the effect of 15–40 mg N/L nitrite on the denitrification performance of the system was first promoted and then inhibited. When the nitrite concentration was 30 mg N/L, the denitrification rate was the highest, which was 1.15 mg/(L·d). The effect of 75–125 mg/L methane on the system was continuously promoted. When the methane concentration was 125 mg/L, the denitrification rate was 1.22 mg/(L·d). The kinetic analytical results showed that the prediction of the quantitative relationship between the nitrite–DAMO system and humic acid performed by the half-order substrate removal model resulted in a good fit. The denitrification process of the nitrite–DAMO system under the influence of 750 mg/L humic acid conformed to the Monod and Haldane models, and the theoretical optimum denitrification rate was 2.31 mg N/(L·d). Through the analysis of the thermodynamic state of the nitrite–DAMO system, the biomass yield of the nitrite–DAMO bacteria was obtained. The stoichiometric calculation results showed that humic acid (0–2000 mg/L) had a significant impact on the biomass yield of the nitrite–DAMO system. When the addition amount was 750 mg HA/L, the system biomass yield was the highest, but the actual biomass yield of the system was generally low in theory.
    Keywords air ; biomass production ; biotransformation ; denitrification ; freshwater ; humic acids ; methane ; models ; nitrites ; oxidation ; prediction ; soil ; stoichiometry ; thermodynamics
    Language English
    Dates of publication 2023-01
    Size p. 23.
    Publishing place Springer International Publishing
    Document type Article ; Online
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-022-06049-y
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  6. Article: Effects of Environmental Factors on Nitrate-DAMO Activity

    Lou, Juqing / Lv, Jiao / Yang, Dongye

    Water, air, and soil pollution. 2020 June, v. 231, no. 6

    2020  

    Abstract: Nitrate-denitrifying anaerobic methane oxidation (Nitrate-DAMO) process is a novel bioprocess which couples anaerobic oxidation of methane (AOM) with nitrite/nitrate reduction. In this study, one Nitrate-DAMO culture contains both DAMO bacteria (62.2%) ... ...

    Abstract Nitrate-denitrifying anaerobic methane oxidation (Nitrate-DAMO) process is a novel bioprocess which couples anaerobic oxidation of methane (AOM) with nitrite/nitrate reduction. In this study, one Nitrate-DAMO culture contains both DAMO bacteria (62.2%) and DAMO archaea (26.5%). The environmental conditions, temperature, pH, and dissolved oxygen were found to affect Nitrate-DAMO activity significantly. When temperature was below 35 °C, Nitrate-DAMO reaction rate dropped as temperature decreased, and when temperature was above 35 °C, Nitrate-DAMO reaction rate decreased as temperature rose; Nitrate-DAMO reaction rate reached maximum at 35 °C. When pH was below 6.5, Nitrate-DAMO reaction rate decreased with the decrease of pH, and when pH was above 7.5, Nitrate-DAMO reaction rate decreased as pH rose; the maximum Nitrate-DAMO reaction rate appeared at both pH 6.5 and 7.5. Nitrate-DAMO activity was inversely proportional to dissolved oxygen concentration, which meant the existence of dissolved oxygen inhibited Nitrate-DAMO process.
    Keywords Archaea ; air ; bioprocessing ; dissolved oxygen ; methane ; nitrate reduction ; nitrites ; oxidation ; pH ; soil pollution ; temperature ; water
    Language English
    Dates of publication 2020-06
    Size p. 263.
    Publishing place Springer International Publishing
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-020-04640-9
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  7. Article ; Online: The effect of sulfate on nitrite-denitrifying anaerobic methane oxidation (nitrite-DAMO) process.

    Li, Jiaping / Lou, Juqing / Lv, Jiao

    The Science of the total environment

    2020  Volume 731, Page(s) 139160

    Abstract: Sulfate is generally found in natural water and wastewater. Nitrite-DAMO bacteria live in natural water or wastewater containing different sulfates. To determine the effect of sulfate on the nitrite-DAMO process, we conducted batch tests and continuous ... ...

    Abstract Sulfate is generally found in natural water and wastewater. Nitrite-DAMO bacteria live in natural water or wastewater containing different sulfates. To determine the effect of sulfate on the nitrite-DAMO process, we conducted batch tests and continuous tests to investigate the performance and microbial structure of the nitrite-DAMO system at different sulfate concentrations. The results indicated that the nitrogen removal performance of the nitrite-DAMO system was initially promoted and then inhibited at 0-200 mg SO
    MeSH term(s) Anaerobiosis ; Bioreactors ; Denitrification ; Methane ; Nitrites ; Oxidation-Reduction ; Sulfates
    Chemical Substances Nitrites ; Sulfates ; Methane (OP0UW79H66)
    Language English
    Publishing date 2020-05-04
    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.2020.139160
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  8. Article: Production and characteristics of elemental sulfur during simultaneous nitrate and sulfide removal

    Sun, Yue / Qaisar, Mahmood / Wang, Kaiquan / Lou, Juqing / Li, Qiangbiao / Cai, Jing

    Environmental science and pollution research. 2021 July, v. 28, no. 27

    2021  

    Abstract: The production and characteristics of elemental sulfur were examined during simultaneous sulfide and nitrate removal, with abiotic assays as control. The biotic assay showed good sulfide and nitrate removal, with the respective removal percentage of ... ...

    Abstract The production and characteristics of elemental sulfur were examined during simultaneous sulfide and nitrate removal, with abiotic assays as control. The biotic assay showed good sulfide and nitrate removal, with the respective removal percentage of which were 90.67–96.88% and 100%. Nitrate reduction resulted in the production of nitrogen gas, while sulfate formed due to sulfide oxidation. The concentration of elemental sulfur in the effluent was greater than that in the sludge, which accounted for 73.70–86.28% of total elemental sulfur produced. Furthermore, the elemental sulfur of the effluent and sludge from the biotic assays was orthorhombic crystal S₈. Elemental sulfur was normally distributed in the effluent, but its average diameter increased with the increasing influent sulfide concentration (60–300 mg S/L), where the average diameter increased from 10 (60 mg S/L) to 29 μm (300 mg S/L).
    Keywords nitrate reduction ; nitrates ; nitrogen ; oxidation ; pollution ; research ; sludge ; sulfates ; sulfides ; sulfur
    Language English
    Dates of publication 2021-07
    Size p. 36226-36233.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-021-13269-y
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  9. Article: The short- and long-term effects of nitrite on denitrifying anaerobic methane oxidation (DAMO) organisms

    Lou, Juqing / Xilei Wang / Jiaping Li / Jingyi Han

    Environmental science and pollution research international. 2019 Feb., v. 26, no. 5

    2019  

    Abstract: The denitrifying anaerobic methane oxidation (DAMO) process can achieve methane oxidation and denitrification at the same time by using nitrate or nitrite as an electron acceptor. The short- and long-term effects of nitrite on DAMO organisms were studied ...

    Abstract The denitrifying anaerobic methane oxidation (DAMO) process can achieve methane oxidation and denitrification at the same time by using nitrate or nitrite as an electron acceptor. The short- and long-term effects of nitrite on DAMO organisms were studied from macro (such as denitrification) to micro (such as microbial structure and community) based on two types of DAMO microbial systems. The results showed that the inhibitory effects of nitrite on the two DAMO microbial systems increased with rising concentration and prolonged time. In the short-term inhibitory phase, nitrite with concentrations below 100 mg N L⁻¹ did not inhibit the two distinct DAMO enrichments. When nitrite concentration was increased to 950 mg N L⁻¹, the nitrogen removal performance was completely inhibited. However, in the long-term inhibition experiment, when nitrite concentration was increased to 650 mg N L⁻¹, the nitrogen removal performance was completely inhibited. In addition, in acidic conditions, the real inhibitor of nitrite is FNA (free nitrous acid), while in alkaline conditions, the real inhibitor is the ionized form of nitrite. By using high-throughput sequencing technology, the species abundance and diversity of the two DAMO microbial systems showed an apparent decrease after long-term inhibition, and the community structure also changed significantly. For the enrichment culture dominated by DAMO bacteria, the substantial drop of Methylomonas may be the internal cause of the decreased nitrogen removal rate, and for the coexistence system that hosted both DAMO bacteria and archaea, the reduction of Nitrospirae may be an internal reason for the decline of the denitrification rate.
    Keywords Archaea ; Methylomonas ; Nitrospirae ; bacteria ; community structure ; denitrification ; enrichment culture ; high-throughput nucleotide sequencing ; ionization ; long term effects ; methane ; nitrates ; nitrites ; nitrogen ; nitrous acid ; oxidation ; species abundance
    Language English
    Dates of publication 2019-02
    Size p. 4777-4790.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-018-3936-4
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  10. Article ; Online: Production and characteristics of elemental sulfur during simultaneous nitrate and sulfide removal.

    Sun, Yue / Qaisar, Mahmood / Wang, Kaiquan / Lou, Juqing / Li, Qiangbiao / Cai, Jing

    Environmental science and pollution research international

    2021  Volume 28, Issue 27, Page(s) 36226–36233

    Abstract: The production and characteristics of elemental sulfur were examined during simultaneous sulfide and nitrate removal, with abiotic assays as control. The biotic assay showed good sulfide and nitrate removal, with the respective removal percentage of ... ...

    Abstract The production and characteristics of elemental sulfur were examined during simultaneous sulfide and nitrate removal, with abiotic assays as control. The biotic assay showed good sulfide and nitrate removal, with the respective removal percentage of which were 90.67-96.88% and 100%. Nitrate reduction resulted in the production of nitrogen gas, while sulfate formed due to sulfide oxidation. The concentration of elemental sulfur in the effluent was greater than that in the sludge, which accounted for 73.70-86.28% of total elemental sulfur produced. Furthermore, the elemental sulfur of the effluent and sludge from the biotic assays was orthorhombic crystal S
    MeSH term(s) Bioreactors ; Nitrates ; Oxidation-Reduction ; Sewage ; Sulfides ; Sulfur
    Chemical Substances Nitrates ; Sewage ; Sulfides ; Sulfur (70FD1KFU70)
    Language English
    Publishing date 2021-03-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-021-13269-y
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