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Performance and microbial community analysis of bioaugmented activated sludge for nitrogen-containing organic pollutants removal

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Journal of environmental sciences 2021年第3期33卷 373-381页

作者： Xuwang Zhang Zhaojian Song Qidong Tang Minghuo Wu Hao Zhou Lifen Liu Yuanyuan Qu Key Laboratory of Industrial Ecology and environmental engineering(Ministry of Education) School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China Key Laboratory of Industrial Ecology and environmental engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

Nitrogen-containing organic pollutants(quinoline,pyridine and indole)are widely distributed in coking wastewater,and bioaugmentation with specific microorganisms may enhance the removal of these recalcitrant pollutants.The bioaugmented system(group B)was constructed through inoculation of two aromatics-degrading bacteria,Comamonas sp.Z1(quinoline degrader)and Acinetobacter sp.JW(indole degrader),into the activated sludge for treatment of quinoline,indole and pyridine,and the non-bioaugmented activated sludge was used as the control(group C).Both groups maintained high efficiencies(>94%)for removal of nitrogen-containing organic pollutants and chemical oxygen demand(COD)during the long-term operation,and group B was highly effective at the starting period and the operation stage fed with raw wastewater.High-throughput sequencing analysis indicated that nitrogen-containing organic pollutants could shape the microbial community structure,and communities of bioaugmented group B were clearly separated from those of non-bioaugmented group C as observed in non-metric multidimensional scaling(NMDS)plot.Although the inoculants did not remain their dominance in group B,bioaugmentation could induce the formation of effective microbial community,and the indigenous microbes might play the key role in removal of nitrogen-containing organic pollutants,including Dokdonella,Comamonas and Pseudoxanthomonas.Phylogenetic Investigation of Communities by Reconstruction of Unobserved States(PICRUSt)analysis suggested that bioaugmentation could facilitate the enrichment of functional genes related to xenobiotics biodegradation and metabolism,probably leading to the improved performance in group B.This study indicated that bioaugmentation could promote the removal of nitrogen-containing organic pollutants,which should be an effective strategy for wastewater treatment.

关键词： Bioaugmentation Indigenous microbes Microbial community Nitrogen-containing organic pollutants Wastewater treatment

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PM_(2.5), PM_(10) and health risk assessment of heavy metals in a typical printed circuit noards manufacturing workshop

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Journal of environmental sciences 2014年第10期26卷 2018-2026页

作者： Peng Zhou Jie Guo Xiaoyu Zhou Wei Zhang Lili Liu Yangcheng Liu Kuangfei Lin school of Resources and environmental engineering East China University of Science and Technology

A typical Printed Circuit Board（PCB） manufacturer was chosen as the object of this study.During PCB processing, fine particulate matter and heavy metals（Cu, Zn, Pb, Cr, Cd and Ni）will be released into the air and dust, which then impact workers＇ health and the environment. The concentrations of total suspended particle（TSP）, PM10 and PM2.5in the off-site were 106.3, 90.0 and 50.2 μg/m3, respectively, while the concentrations of TSP, PM10 and PM2.5in the workshops ranged from 36.1 to 365.3, from 27.1 to 289.8 and from 22.1 to212.3 μg/m3, respectively. Almost all six of the heavy metals were detected in all of the particle samples except Cd. For each workshop, it was obvious that Zn was the most enriched metal in TSP, followed by Cu 〉 Pb（Cr）〉 Ni 〉 Cd, and the same trend was found for PM10 and PM2.5. In the dust samples, Cu（which ranged from 4.02 to 56.31 mg/g） was the most enriched metal, followed by Zn, Cr, Pb, Ni and Cd, and the corresponding concentrations ranged from 0.77 to 4.47, 0.37 to 1.59, 0.26 to 0.84, 0.13 to 0.44 and nd to0.078 mg/g, respectively. The health risk assessment showed that noncancerous effects are unlikely for Zn, Pb, Cr, Cu, Cd and Ni. The carcinogenic risks for Cd and Ni were all lower than 10-6, except for Cr. This result indicates that carcinogenic risks for workers are relatively possible in the workshops. These findings suggest that this technology is advanced from the perspective of environmental protection in the waste PCB＇s recycling industry.

关键词： Heavy metal PM2.5 Dust Risk assessment PCB manufacturing

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Geographic distribution of arsenic contamination in the Himalayan Rivers flowing through Pakistan: Implications for its natural source and effects of anthropogenic activities

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International Journal of Sediment Research 2023年第4期38卷 543-555页

作者： Ishtiaque Hussain Hafiz Ur.Rehman Takaaki Itai Junaid Ali Khattak Abida Farooqi environmental Geochemistry Laboratory Department of Environmental Sciences Faculty of Biological Sciences Quaid-i-Azam University Department of environmental sciences University of Baltistan Skardu Graduate school of sciences and engineering Kagoshima University Department of Earth and Planetary environmental science (UG) Graduate School of Science The University of Tokyo Department of Earth and Planetary Physics (UG) Graduate School of Science The University of Tokyo Department of Earth and Planetary science (GR) Graduate School of Science The University of Tokyo

Arsenic(As) in natural hydrological systems is known as a worldwide major environmental concern. A geochemical and sedimentological study was done to ascertain the origin and geographical distribution of As in surface water and fluvial sediment collected from the floodplains/basins of the River Indus and its four major tributaries that drain through the northern Pakistan. The hydrogeochemical compositions of all five rivers were similar with calcium(Ca2+) and bicarbonate(HCO3-) being the dominating ions. The concentration of As ranged from 0.62-24.05 μg/L(average 3.7 ± 3.5 μg/L, n = 61) in river water, 2.3-23.4 mg/kg(average 5.7 ± 3.9 mg/kg) in suspended sediment, and 2.0-13 mg/kg(average4.13 ± 2.3 mg/kg) in fluvial sediment. Various approaches were used, including mineralogical, sequential extraction, geochemical, and statistical analyses to investigate the distribution, behavior, and potential sources of As in the sediment. The effect of geological factors on the distribution of As was also studied.No noticeable changes in the relative abundance of minerals were observed in the sediment at different locations along the river. Both mineralogical and statistical analyses showed that silicate minerals like muscovite, biotite, and chloride are the main As reservoir while oxides minerals like hematite and magnetite, which are minor components in the sediment are second largest As carrier. A geochemical baseline, using the normalization and cumulative frequency distribution curves was constructed for As.The estimated mean human contribution of As was 3.4% in the Indus River, 1.9% in the Jhelum River, 13.7%in the Chenab River, 17.5% in the Ravi River and 5.4% in the Sutlej River, indicating relatively higher effects of anthropogenic activity along the Chenab River and Ravi River. The almost negligible effects of anthropogenic activities were additionally confirmed through the pollution assessment parameters estimated from the geo-enrichment, contamination factors, and accumulation index analyses. The current data sugg

关键词： Arsenic Indus basin Geochemical baseline Source Contamination assessment

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一步法构筑双功能富含氧空位的花瓣状镍铝水滑石纳米薄片用于高性能超级电容器和尿素氧化

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science China Materials 2022年第7期65卷 1805-1813页

作者：王宇辰刘瑶钰张曼刘碧莹赵志月严凯 Guangdong Provincial Key Laboratory of environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China

镍基水滑石在能量存储(超级电容器)和转化(尿素氧化)领域是很有前景的电极材料.合理构建镍基水滑石的原子和电子结构对于实现其理想的电化学性能至关重要.本论文报道了一种简单、环境友好的一步法制备富含氧空位的花瓣状镍铝水滑石(NiAl... 详细信息

镍基水滑石在能量存储(超级电容器)和转化(尿素氧化)领域是很有前景的电极材料.合理构建镍基水滑石的原子和电子结构对于实现其理想的电化学性能至关重要.本论文报道了一种简单、环境友好的一步法制备富含氧空位的花瓣状镍铝水滑石(NiAl-LDHs)纳米薄片用于混合超级电容器和尿素氧化.性能最好的富氧空位NiAl-LDHs纳米薄片具有216.6 m^(2) g^(-1)的大比表面积和3.45×10^(-4)S cm^(-1)的高电导率,可在1 A g^(-1)的比电流下展示出2801 F g^(-1)(700 C g^(-1))的超高比电容.基于NiAl-LDHs//商业活性炭组装的混合超级电容器在400 W kg^(-1)比功率密度下可获得50.0 W h kg^(-1)的比能量,且循环10,000次后仍有91%的电容保持率.同时,NiAl-LDHs纳米薄片作为高效的尿素氧化电催化剂,在1 mol L^(-1)KOH和0.33 mol L^(-1)尿素中仅需1.42 V vs.可逆氢电极的氧化电位就可达到10 mA cm^(-2)的电流密度.由于NiAl-LDHs的纳米薄片结构暴露了更多的活性位点和丰富的氧空位,其电化学性能优于大部分报道的镍基水滑石.因此,本研究为多功能纳米能源材料的合理设计奠定了良好的基础.

关键词： layered double hydroxides nanosheets oxygen vacancy hybrid supercapacitor urea oxidation reaction

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Alkali metal cation doping of metal-organic framework for enhancing carbon dioxide adsorption capacity

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Journal of Energy Chemistry 2014年第4期23卷 468-474页

作者： Yan Cao Yunxia Zhao Fujiao Song Qin Zhong school of Chemical engineering Nanjing University of Science and Technology School of Environmental Science and Engineering Yancheng Institute of Technology

Metal-organic frameworks （MOFs） have attracted much attention as adsorbents for the separation of CO2 from flue gas or natural gas. Here, a typical metal-organic framework HKUST-I（also named Cu-BTC or MOF-199） was chemically reduced by doping it with alkali metals （Li, Na and K） and they were further used to investigate their CO2 adsorption capacities. The structural information, surface chemistry and thermal behavior of the prepared adsorbent samples were characterized by X-ray powder diffraction （XRD）, thermo-gravimetric analysis （TGA） and nitrogen adsorption-desorption isotherm analysis. The results showed that the CO2 storage capacity of HKUST-1 doped with moderate quantities of Li＋, Na＋ and K＋, individually, was greater than that of unmodified HKUST-1. The highest CO2 adsorption uptake of 8.64 mmol/g was obtained with 1K-HKUST-1, and it was ca. 11% increase in adsorption capacity at 298 K and 18 bar as compared with HKUST- 1. Moreover, adsorption tests showed that HKUST-1 and 1K-HKUST-1 displayed much higher adsorption capacities of CO2 than those of N2. Finally, the adsorption/desorption cycle experiment revealed that the adsorption performance of 1K-HKUST-1 was fairly stable, without obvious deterioration in the adsorption capacity of CO2 after 10 cycles.

关键词： metal-organic framework HKUST-1 carbon dioxide adsorption alkali metals cation doping adsorption-desorption cycles

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Fluorescence Properties and Crystal Structures of Metal-organic Coordination Complexes Based on the 2,6-Naphthalenedicarboxylic Acid

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Chinese Journal of Structural Chemistry 2017年第6期36卷 971-976页

作者：胡兵相周磊周泽宇汪芳明 school of environmental and Chemical engineering Jiangsu University of Science and Technology

Two metal-organic coordination complexes, [Zn（2,6-ndc）（1,2-bix）]n（1） and [Zn（2,6-ndc）（1,3-bix）]n（2）（2,6-H2ndc = 2,6-naphthalenedicarboxylic acid, 1,2-bix = 1,2-bis（imidazole-1-ylmethyl）-benzene and 1,3-bix = 1,3-bis（imidazole-1-ylmethyl）-benzene） have been synthesized by the hydrothermal method. Though the two complexes both crystallize in a triclinic system, space group P1 and show similar two-dimensional structures, weak intermolecular interactions（π-π packing interactions） only exist in complex 2. They are characterized by single-crystal X-ray diffraction analysis, fluorescence measurement, IR spectroscopy and TGA. Moreover, the solid-state fluorescence spectra of two complexes show maximal emission peaks at 365（λ（ex） = 329 nm） and 367 nm（λex = 344 nm）, respectively.

关键词： fluorescence properties, hydrothermal condition, crystal structure

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Removal of phosphate by Fe-coordinated amino-functionalized 3D mesoporous silicates hybrid materials

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Journal of environmental sciences 2011年第2期23卷 199-205页

作者： Jianda Zhang Zhemin Shen Zhijian Mei Shanping Li Wenhua Wang School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 China School of Environmental Science and Engineering Shandong University Jinan 250100 China

Phosphate removal from aqueous waste streams is an important approach to control the eutrophication downstream bodies of water. A Fe（Ⅲ） coordinated amino-functionalized silicate adsorbent for phosphate adsorption was synthesized by a post-grafting and metal cation incorporation process. The surface structure of the adsorbent was characterized by X-ray diffraction, N2 adsoropion/desoprotion technique, and Fourier transform infrared spectroscopy. The experimental results showed that the adsorption equilibrium data were well fitted to the Langmuir equation. The maximum adsorption capacity of the modified silicate material was 51.8 mg/g. The kinetic data from the adsorption of phosphate were fitted to pseudo second-order model. The phosphate adsorption was highly pH dependent and the relatively high removal of phosphate fell within the pH range 3.0-6.0. The coexistence of other anions in solutions has an adverse effect on phosphate adsorption; a decrease in adsorption capacity followed the order of exogenous anions： F^- 〉 SO4^2- 〉 NO3^- 〉 Cl^-. In addition, the adsorbed phosphate could be desorbed by NaOH solutions. This silicate adsorbent with a large adsorption capacity and relatively high selectivity could be utilized for the removal of phosphate from aqueous waste streams or in aquatic environment.

关键词： phosphate mesoporous material Fe coordinated adsorption

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Advances in the study of submarine groundwater discharge(SGD)in China

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science China Earth sciences 2022年第10期65卷 1948-1960页

作者： Yan ZHANG Xuejing WANG Yan XUE Changpei ZOU Manhua LUO Gang LI Lei LI Laitong CUI Hailong LI school of Water Resources and Environment China University of Geosciences-BeijingBeijing 100083China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

Submarine groundwater discharge(SGD)is a critical land-ocean process in coastal areas and an essential component of the global hydrological cycle.Thus,hydrologists and oceanographers are paying more attention to SGD.SGD transports large amounts of materials into the ocean,including nutrients,carbon,and metals,and thus plays a vital role in the cycling of marine materials and affects the ecological environments of nearshore areas.This study examined the research status of SGD and its environmental effects in China,including a systematic analysis of radium activities and nutrient contents in groundwater,SGD rates,and the contribution of SGD to nutrients in various coastal ecosystems(bays,estuaries,continental shelves,and lagoons).The results showed the median concentrations of groundwater nutrients(dissolved inorganic nitrogen DIN,dissolved inorganic phosphorus DIP,and dissolved inorganic silicon DSi),SGD rates,and SGD-derived DIN and DIP in estuarine areas far exceeded those in the other three ecosystems studied.This result could be attributed to the complex hydrodynamic conditions of estuary areas as well as the considerable influence of human activities.Conversely,the lowest SGD rates and three inorganic nutrient species via SGD were observed in large scale continental shelves.SGD-derived nutrient fluxes were comparable to riverine inputs along the entire coast of China,which significantly affected the nutrient budget,nutrient composition,and primary productivity of coastal waters.Finally,this review suggests further research of SGD in three aspects:(1)accurate assessment,(2)its environmental effects,and(3)its regulatory strategies.

关键词： Submarine groundwater discharge(SGD) Radium isotopes Nutrients Ecosystems environmental effects

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Factors Influencing the Electron Yield of Needle-Ring Pulsed Corona Discharge Electron Source for Negative Ion Mobility Spectrometer

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Plasma science and Technology 2013年第12期15卷 1215-1220页

作者：刘欣李胜利李铭书 School of Environmental Science and Engineering Huazhong University of Science and Technology Jiangxi Academy of environmental sciences

A simple negative ion mobility spectrometer （IMS） is designed and used to investi- gate the factors that influence the number and efficiency of electrons generated by the needle-ring pulsed corona discharge electron source. Simulation with Ansoft Maxwell 12 is carried out to analyze the electric field distribution within the IMS, and to offer the basis and foundation for analyzing the measurement results. The measurement results of the quantities of electrons show that when the drift electric field strength and the ring inner diameter rise, both the number of ef- fective electrons and the effective electron rate are increased. When the discharge voltage becomes stronger, the number of effective electrons goes up while the effective electron rate goes down. In light of the simulation results, mechanisms underlying the effects of drift electric field strength, ring inner diameter, and discharge voltage on the effective electron number and effective electron rate are discussed. These will make great sense for designing negative ion mode IMS using the needle-ring pulsed corona discharge as the electron source.

关键词： ion mobility spectrometer electron source pulsed corona discharge effectiveelectrons simulation

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Preparation and reaction mechanism of novel Ce_(x)Co_(y)Cuz oxide composite catalysts towards oxidation of o-xylene

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Journal of Rare Earths 2022年第10期40卷 1573-1583页

作者： Mengge Zhao Weijian Cai Jiwu Li School of Environmental Science and Engineering Zhejiang Gongshang UniversityHangzhou 310018China Department of Chemistry School of Food Science and BiotechnologyZhejiang Gongshang UniversityHangzhou 310018China

Ce_(x)Co_(y)Cuzoxide composite catalysts were prepared by using polyethylene glycol, citrate sol-gel method combined with PMMA template for the oxidation of o-xylene. The catalysts were characterized by the Xray diffraction(XRD), H2-temperature programmed reduction(H2-TPR), X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FT-IR), etc. The catalytic activity for o-xylene was investigated. The catalytic degradation pathway and mechanism of o-xylene were inferred. The results show that Ce O_(2)is mainly present on the surface of all catalysts. The surface area of Ce_(2)Co1Cu1is up to 77.2 m^(2)/g, and the average pore size is 10.62 nm. It exhibits redox and sufficient Ce^(4+)and Ce^(^(3+)), and reactive oxygen species, and has maximum O-H and C=O in the five catalyst samples. The catalytic activity of Ce2Co1Cu1is the best at low temperature, with the T50and T90values of 235 and 258°C at a space velocity of 32000 h-1, respectively. The o-xylene is oxidized to o-methyl benzaldehyde, and then further oxidized to o-methylbenzoic acid, and finally CO_(2)and H2O are formed.

关键词： Ce_(x)Co_(y)Cuz composite oxide catalyst Polyethylene glycol Citrate sol-gel method Catalytic activity o-xylene Rare earths

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