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A global perspective on microbial risk factors in effluents of wastewater treatment plants

Journal of Environmental Sciences 2024年第4期138卷 227-235页

作者： Kejing Chen Jinsong Liang Yuhan wang Yechen Tao Yun Lu aijie wang School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Shenzhen Guohuan Environmental Protection Technology Development Co. LTD.Shenzhen 518055China State Key Joint Laboratory of Environmental Simulation and Pollution Control State Environmental Protection Key Laboratory of Microorganism Application and Risk ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Effective monitoring and management of microbial risk factors in wastewater treatment plants(WWTPs)effluents require a comprehensive investigation of these risks.A global survey on microbial risk factors in WWTP effluents could reveal important insights into their risk *** study aims to explore the abundance and types of antibiotic resistance genes(ARGs),virulence factor genes(VFGs),the vector of ARG/VFG,and dominant pathogens in global WWTP *** collected 113 metagenomes of WWTP effluents from the Sequence Read Archive of the National Center for Biotechnology Information and characterized the microbial risk *** results showed that multidrug resistance was the dominant ARG type,while offensive virulence factors were the most abundant type of *** most dominant types of ARGs in the vector of plasmid and phage were both aminoglycoside resistance,which is concerning as aminoglycosides are often a last resort for treating multi-resistant *** baumannii was the most dominant pathogen,rather than Escherichia coli,and a weak negative correlation between Escherichia coli and two other dominant pathogens(Acinetobacter baumannii and Bacteroides uniformis)suggests that using Escherichia coli as a biological indicator for all pathogens in WWTP effluents may not be *** Getah virus was the most dominant virus found in global WWTP *** study presents a comprehensive global-scale investigation of microbial risk factors in WWTP effluents,providing valuable insights into the potential risks associated with WWTP effluents and contributing to the monitoring and control of these risks.

关键词： Wastewater treatment plant Microbial risk factor Effluent Pathogen Antibiotic resistance gene Virulence factor gene

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Microbial-driven ectopic uranium extraction with net electrical energy production

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 49-58页

作者： Xin Tang Yin Ye Chunlin wang Bingqian wang Zemin Qin Cui Li Yanlong Chen Yuheng wang Zhiling Li Miao Lv aijie wang Fan Chen School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China School of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China

The extraction of uranium (U) from U-bearing wastewater is of paramount importance for mitigating negative environmental impacts and recovering U resources. Microbial reduction of soluble hexavalent uranium (U(VI)) to insoluble tetravalent uranium (U(IV)) holds immense potential for this purpose, but its practical application has been impeded by the challenges associated with managing U-bacterial mixtures and the biotoxicity of U. To address these challenges, we present a novel spontaneous microbial electrochemical (SMEC) method that spatially decoupled the microbial oxidation reaction and the U(VI) reduction reaction. Our results demonstrated stable and efficient U extraction with net electrical energy production, which was achieved with both synthetic and real wastewater. U(VI) removal occurred via diffusion-controlled U(VI)-to-U(IV) reduction-precipitation at the cathode, and the UIVO_(2) deposited on the surface of the cathode contributed to the stability and durability of the abiotic U(VI) reduction. Metagenomic sequencing revealed the formation of efficient electroactive communities on the anodic biofilm and enrichment of the key functional genes and metabolic pathways involved in electron transfer, energy metabolism, the TCA cycle, and acetate metabolism, which indicated the ectopic reduction of U(VI) at the cathode. Our study represents a significant advancement in the cost-effective recovery of U from U(VI)-bearing wastewater and may open a new avenue for sustainable uranium extraction.

关键词： U(VI)bioreduction Electricity production Reaction decoupling Uranium-bearing wastewater Biofilm microbiome

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Highly efficient removal of ozone by amorphous manganese oxides synthesized with a simple hydrothermal method

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Journal of Environmental Sciences 2023年第12期134卷 96-107页

作者： Hong Zhao aijie wang Qiuyan Zhang Chong Han School of Metallurgy Northeastern UniversityShenyang 110819China

Amorphous manganese oxides (MnO_(x)) were synthesized by facile hydrothermal reactions between potassium permanganate and manganese *** parameters,including hydrothermal time and temperature and molar ratio of precursors,significantly affected the ozone removal performance and structure property of MnO_(x).Amorphous MnO_(x)-1.5,which was prepared at the Mn^(2+)/Mn^(7+)molar ratio of 1.5 under hydrothermal conditions of 120℃ and 2 hr,showed the highest ozone removal rate of 93% after 480 min at the room temperature,RH (relative humidity)=80%and WHSV (weight hourly space velocity)=600 L/(g·hr).The morphology,composition and structure of catalysts were investigated with X-ray diffractometer (XRD),Raman spectra,N_(2) physisorption,field emission scanning electron microscope (FESEM),X-ray photoelectron spectroscopy (XPS),H2temperature-programmed reduction (H_(2)-TPR),O_(2) temperature-programmed desorption (O_(2)-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS).It was confirmed that high catalytic activity of amorphous MnOxfor ozone removal was mainly ascribed to its abundant oxygen vacancies,high oxygen mobility and large specific surface area.

关键词： Amorphous manganese oxides Hydrothermal method Ozone Catalytic decomposition Oxygen vacancies

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Opportunities and challenges after biosecurity legislation--What we can and should do in environmental science and ecotechnology?

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Environmental Science and Ecotechnology 2021年第2期6卷 11-12页

作者： aijie wang State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

When we generally talk about biosecurity,it is closely related to the potential threats to the ecological environment and human health caused by the development of *** the development of a certain organism suffers from natural or manmade“disturbance”,it cannot be quickly restored to its original state,thus posing a threat to other species.

关键词： threat manmade biotechnology

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Performance of low temperature Microbial Fuel Cells(MFCs)catalyzed by mixed bacterial consortia

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Journal of Environmental Sciences 2017年第2期29卷 284-292页

作者： Olga Tkach Thangavel Sangeetha Spiridonova Maria aijie wang State Key Laboratory of Urban Water Resources and Enuironment(SKLUWRE) Harbin Institute of TechnologyHarbin 150090China. Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Krasnoyarsk State Institution of Railway Vehicles Krasnoyarsk 660028Russia

Microbial Fuel Cells（MFCs） are a promising technology for treating wastewater in a sustainable manner. In potential applications, low temperatures substantially reduce MFC performance. To better understand the effect of temperature and particularly how bioanodes respond to changes in temperature, we investigated the current generation of mixed-culture and pure-culture MFCs at two low temperatures, 10°C and 5°C. The results implied that the mixed-culture MFC sustainably performed better than the pure-culture（Shewanella） MFC at 10°C, but the electrogenic activity of anodic bacteria was substantially reduced at the lower temperature of 5°C. At 10°C, the maximum output voltage generated with the mixed-culture was 540–560 m V, which was 10%–15% higher than that of Shewanella MFCs. The maximum power density reached 465.3 ± 5.8 m W/m^2 for the mixed-culture at10°C, while only 68.7 ± 3.7 m W/m^2 was achieved with the pure-culture. It was shown that the anodic biofilm of the mixed-culture MFC had a lower overpotential and resistance than the pure-culture MFC. Phylogenetic analysis disclosed the prevalence of Geobacter and Pseudomonas rather than Shewanella in the mixed-culture anodic biofilm, which mitigated the increase of resistance or overpotential at low temperatures.

关键词： Microbial fuel cell Psychrophilic bacteria Shewanella Low temperature Bioelectrochemical

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Enhanced methane recovery and exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow biofilm reactor with conductive granular graphite fillers

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Frontiers of Environmental Science & Engineering 2018年第4期12卷 131-140页

作者： Zechong Guo Lei Gao Ling wang Wenzong Liu aijie wang State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology (SKLUWRE HIT) Harbin 150001 China Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences. Beijing 100085 China＊

Methane production from low-strength wastewater （LSWW） is generally difficult because of the low metabolism rate of methanogens. Here, an up-flow biofilm reactor equipped with conductive granular graphite （GG） as fillers was developed to enhance direct interspecies electron transfer （DIET） between syntrophie electroactive bacteria and methanogens to stimulate methanogcnesis process. Compared to quartz sand fillers, using condnctive fillers significantly enhanced methane production and accelerated the start-up stage *** reactor. At HRT of 6 h, the average methane production rate and methane yield of reactor with GG were 0.106 m3/（m3.d） and 74.5 L/kg COD, which increased by 34.3 times and 22.4 times respectively compared with the reactor with common quartz sand fillers. The microbial cornmunity analysis revealed that methanogens structure was significantly altered and the archaea that are involved in DIET （such as Methanohacterium） were enriched in GG fillet- The beneficial effects ot conductive fillers on methane production implied a practical strategy tbr efficient methane recovery from LSWW.

关键词： Low-strength wastewater Methane production Conductive filler Microbial community structure

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Cerium-modified amorphous manganese oxides for efficient catalytic removal of ozone

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Journal of Environmental Sciences 2023年第9期131卷 151-161页

作者： aijie wang Hong Zhao Yu Wu Qiuyan Zhang Chong Han School of Metallurgy Northeastern UniversityShenyang 110819China

Manganese-based catalysts were widely developed for catalytic removal of ozone,and the low stability and water inactivation are major *** improve removal performance of ozone,three methods were applied to modify amorphous manganese oxides,including acidification,calcination and Ce *** physiochemical properties of prepared samples were characterized,and the catalytic activity for ozone removal was *** modification methods can promote the removal of ozone by amorphous manganese oxides,and Ce modification showed the most significant *** was confirmed that the introduction of Ce markedly changed the amount and property of oxygen vacancies in amorphous manganese *** catalytic activity of Ce-MnO_(x) can be ascribed to its more content and enhanced formation ability of oxygen vacancies,larger specific surface area and higher oxygen ***,the durability tests under high relative humidity(80%)determined that Ce-MnO_(x) showed excellent stability and water *** demonstrate the promising potential of amorphously Ce-modified manganese oxides for catalytic removal of ozone.

关键词： Amorphous manganese oxides Cerium Oxygen vacancy Ozone Stability

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Effect of seed sludge on characteristics and microbial community of aerobic granular sludge

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Journal of Environmental Sciences 2010年第9期22卷 1312-1318页

作者： Zhiwei Song Yuejun Pan Kun Zhang Nanqi Ren aijie wang School of Resource and Environmental Engineering Heilongjiang Institute of Science and Technology Harbin 150027 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150001 China

Aerobic granular sludge was cultivated by using different kinds of seed sludge in sequencing batch airlift reactor. The influence of seed sludge on physical and chemical properties of granular sludge was studied; the microbial community structure was probed by using scanning electron microscope and polymerase chain reaction-denaturing gradient gel electrophoresis （PCR-DGGE）. The results showed that seed sludge played an important role on the formation of aerobic granules. Seed sludge taken from beer wastewater treatment plant （inoculum A） was more suitable for cultivating aerobic granules than that of sludge from municipal wastewater treatment plant （inoculurn B）. Cultivated with inoculum A, large amount of mature granules formed after 35 days operation, its SVI reached 32.75 mL/g, and SOUR of granular sludge was beyond 1.10 mg/（***）. By contrast, it needed 56 days obtaining mature granules using inoculum B. DGGE profiles indicated that the dominant microbial species in mature granules were 18 and 11 OTU when inoculum A and B were respectively employed as seed sludge. The sequencing results suggested that dominant species in mature granules cultivated by inoculum A were Paracoccus sp., Devosia hwasunensi, Pseudoxanthomonas sp., while the dominant species were Lactococcus raffinolactis and Pseudomonas sp. in granules developed from inoculum B.

关键词： aerobic granular sludge seed sludge microbial community PCR-DGGE

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Effect of temperature switchover on the degradation of antibiotic chloramphenicol by biocathode bioelectrochemical system

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Journal of Environmental Sciences 2014年第8期26卷 1689-1697页

作者： Deyong Kong Bin Liang Duu-Jong Lee aijie wang Nanqi Ren State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental EngineeringHarbin Institute of Technology Key laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Exposure to chloramphenicol（CAP）,a chlorinated nitroaromatic antibiotic,can induce CAP-resistant bacteria/genes in diverse environments. A biocathode bioelectrochemical system（BES） was applied to reduce CAP under switched operational *** switching from 25 to 10°C,the CAP reduction rate（kCAP） and the maximum amount of the dechlorinated reduced amine product（AMCl,with no antibacterial activity） by the biocathode communities were both markedly decreased. The acetate and ethanol yield from cathodophilic microbial glucose fermentation（with release of electrons） was also reduced. Formation of the product AMCl was enhanced by the biocathode dechloridation reaction compared with that produced from pure electrochemical or microbial dechloridation processes. The electrochemical and morphological analyses of cathode biofilms demonstrated that some cathodophilic microbes could adapt to low temperature and play a key role in CAP degradation. The resilient biocathode BES has a potential for the treatment of CAP-containing wastewater in temperature fluctuating environments.

关键词： Chloramphenicol degradation Biocathode Dechloridation Temperature switchover

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Effects of various pretreatment methods on mixed microflora to enhance biohydrogen production from corn stover hydrolysate

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Journal of Environmental Sciences 2011年第12期23卷 1929-1936页

作者： Kun Zhang Nanqi Ren Changhong Guo aijie wang Guangli Cao State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province College of Life Science and Technology Harbin Normal University Harbin 150025 China

Five individual pretreatment methods, including three widely-used protocols （heat, acid and base） and two novel attempts （ultrasonic and ultraviolet）, were conducted in batch tests to compare their effects on mixed microflora to enhance hydrogen （H2） production from corn stover hydrolysate. Experimental results indicated that heat and base pretreatments significantly increased H2 yield with the values of 5.03 and 4.45 mmol H2/g sugar utilized, respectively, followed by acid pretreatment of 3.21 mmol H2/g sugar utilized. However, compared with the control （2.70 mmol H2/g sugar utilized）, ultrasonic and ultraviolet pretreatments caused indistinctive effects on H2 production with the values of 2.92 and 2.87 mmol H2/g sugar utilized, respectively. The changes of soluble metabolites composition caused by pretreatment were in accordance with H2-producing behavior. Concretely, more acetate accumulation and less ethanol production were found in pretreated processes, meaning that more reduced nicotinamide adenine dinucleotide （NADH） might be saved and flowed into H2-producing pathways. PCR-DGGE analysis indicated that the pretreatment led to the enrichment of some species, which appeared in large amounts and even dominated the microbial community. Most of the dominated species were affiliated to Enterobacter spp. and Escherichia spp. As another efflcient H2 producer, Clostridium bifermentan was only found in a large quantity after heat pretreatment. This strain might be mainly responsible for better performance of H2 production in this case.

关键词： biohydrogen pretreatment corn stover hydrolysate microbial community

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