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Simultaneous removal of SO2 and NO using a spray dryer absorption(SDA) method combined with O3 oxidation for sintering/pelleting flue gas

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Journal of Environmental Sciences 2020年第10期32卷 64-71页

作者： Maoyu Cai Xiaolong Liu Tingyu Zhu Yang Zou Wenliang Tao Mengkui Tian School of Chemistry and ChemicalEngineering Guizhou UniuersityGuiyang 550025China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center for Excellence in Regional Atmospheric enuironment Institute of Urban EnuironmentChinese Academy of SciencesXiamen 361021China

Based on the demand of sintering/pelleting flue gas ultra-low emission,a semi-dry method using a spray dryer absorber (SDA) combined with O3 oxidation was proposed for simultaneous removal of SO2 and NO.Effects of O3 injection site,O3/NO molar ratio,and spray tower temperature on the removal efficiencies were investigated.It was revealed that both desulfurization and denitrification efficiencies could reach to 85%under the conditions of setting O3 injection site inside of tower,O3/NO molar ratio 1.8,spray tower temperature 85°C,Ca/(S+2N) molar ratio 2.5 and slurry flow rate 300 m L/hr.CaSO3/Ca(OH)2 mixture slurry was used as absorbent to simulate operating conditions in iron and steel industry.The result shows that the addition of CaSO3 weakens both removal efficiencies.In addition,the reaction mechanism of simultaneous removal of SO2 and NO using SDA combined with O3 oxidation was proposed.

关键词： O_3 oxidation Desulfurization Denitrification Semi-dry method Spray dryer absorption

Removing ammonium from water and wastewater using cost-effective adsorbents:A review

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Journal of Environmental Sciences 2018年第1期30卷 174-197页

作者： Jianyin Huang Nadeeka Rathnayake Kankanamge Christopher Chow David T.Welsh Tianling Li Peter R.Teasdale Natural and Built Environments research Centre School of Natural and Built EnvironmentsUniversity of South AustraliaSA 5095Australia Future Industries institute University of South AustraliaSA 5095Australia enuironmental Futures research institute School of EnuironmentGriffith UniuersityGold Coast campusQLD 4215Australia

Ammonium is an important nutrient in primary production; however, high ammonium loads can cause eutrophication of natural waterways, contributing to undesirable changes in water quality and ecosystem structure. While ammonium pollution comes from diffuse agricultural sources, making control difficult, industrial or municipal point sources such as wastewater treatment plants also contribute significantly to overall ammonium pollution.These latter sources can be targeted more readily to control ammonium release into water systems. To assist policy makers and researchers in understanding the diversity of treatment options and the best option for their circumstance, this paper produces a comprehensive review of existing treatment options for ammonium removal with a particular focus on those technologies which offer the highest rates of removal and cost-effectiveness. Ion exchange and adsorption material methods are simple to apply, cost-effective, environmentally friendly technologies which are quite efficient at removing ammonium from treated water. The review presents a list of adsorbents from the literature, their adsorption capacities and other parameters needed for ammonium removal. Further, the preparation of adsorbents with high ammonium removal capacities and new adsorbents is discussed in the context of their relative cost, removal efficiencies, and limitations. Efficient, cost-effective, and environmental friendly adsorbents for the removal of ammonium on a large scale for commercial or water treatment plants are provided. In addition, future perspectives on removing ammonium using adsorbents are presented.

关键词： Ammonium Water treatment Capacities Cost-effective Environmental friendly

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

Stability of Fe-As composites formed with As(Ⅴ)and aged ferrihydrite

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Journal of Environmental Sciences 2021年第2期33卷 43-50页

作者： Zhonglan Yang Lingyu Bai Shiming Su Yanan Wang Cuixia Wu Xibai Zeng Benhua Sun College of Natural Resources and Environment Northwest A&F UniversityYangling 712100China institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agriculture SciencesKey Laboratory of Agro-EnuironmentMinistry of Agricidture and Rural AffairsBdjing 100081China

During the aging process,ferrihydrite was transformed into mineral mixtures composed of different proportions of ferrihydrite,goethite,lepidocrocite and hematite.Such a transformation may affect the fixed ability of arsenic.In this study,the stability of Fe-As composites formed with As(Ⅴ)and the minerals aged for 0,1,4,10 and 30 days of ferrihydrite were systematically examined,and the effects of molar of ratios Fe/As were also clarified using kinetic methods combined with multiple spectroscopic techniques.The results indicated that As(Ⅴ)was rapidly adsorbed on minerals during the initial polymerization process,which delayed both the ferrihydrite conversion and the hematite formation.When the Fe/As molar ratio was 1.875 and 5.66,the As(Ⅴ)adsorbed by ferrihydrite began to release after 6 hr and 12 hr,respectively.The corresponding release amounts of As(Ⅴ)were 0.55 g/L and 0.07 g/L,and the adsorption rates were 92.43%and 97.50%at 60 days,respectively.However,the As(Ⅴ)adsorbed by the transformation products aged for 30 days of ferrihydrite began to release after adsorbed 30 days.The corresponding release amounts of As(Ⅴ)were 0.25 g/L and 0.03 g/L,and the adsorption rates were 84.23%and 92.18%after adsorbed 60 days,for the Fe/As=1.875 and 5.66,respectively.Overall,the combination of As(Ⅴ)with ferrihydrite and aged products transformed from a thermodynamically metastable phase to a dynamically stable state within a certain duration.Moreover,the aging process of ferrihydrite reduced the sorption ability of arsenate by iron(hydr)oxide but enhanced the stability of the Fe-As composites.

关键词： Fe-As composites Transformation products Sorption ability Crystallization Aged

Cysteine-enhanced reductive degradation of nitrobenzene using nano-sized zero-valent iron by accelerated electron transfer

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Journal of Environmental Sciences 2021年第2期33卷 110-116页

作者： Yuanming Peng Yunsong Mu Chao Xue Anwei Chen Liang Peng Haiyong Wu Si Luo College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China School of enuironment&Natural Resources Renmin University of ChinaBeijing 100872China Soil and Fertilizer institute of Hunan Province Hunan Academy of Agricultural SciencesChangsha 401125China 不详

As an aliphatic amino acid,cysteine(CYS)is diffuse in the living cells of plants and animals.However,little is known of its role in the reactivity of nano-sized zero-valent iron(NZVI)in the degradation of pollutants.This study shows that the introduction of CYS to the NZVI system can help improve the efficiency of reduction,with 30%more efficient degradation and a reaction rate constant nine times higher when nitrobenzene(NB)is used as probe compound.The rates of degradation of NB were positively correlated with the range of concentrations of CYS from 0 to 10 mmol/L.The introduction of CYS increased the maximum concentration of Fe(Ⅲ)by 12 times and that of Fe(II)by four times in this system.A comparison of systems featuring only CYS or Fe(Ⅱ)showed that the direct reduction of NB was not the main factor influencing its CYS-stimulated removal.The reduction in the concentration of CYS was accompanied by the generation of cystine(CY,the oxidized form of cysteine),and both eventually became stable.The introduction of CY also enhanced NB degradation due to NZVI,accompanied by the regeneration of CYS.This supports the claim that CYS can accelerate electron transfer from NZVI to NB,thus enhancing the efficiency of degradation of NB.

关键词： Zero-valent iron Nanoparticles CYS Electron shuttle Reactivity

Carbon flow analysis of China＇s agro-ecosystem from 1980 to 2013： A perspective from substance flow analysis

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Journal of Environmental Sciences 2017年第5期29卷 20-32页

作者： Yu Li Can Wang Minpeng Chen 1. School of Environrnent Tsinghua Uniuersity Beijing 100084 China. State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua Uniuersity Beijing 100084 China institute of enuironment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Beijing 100081 China

research on carbon cycling has attracted attention from both scientists and policy-makers. Based on material flow analysis, this study systematically budgets the carbon inputs, outputs and balance from 1980 to 2013 for China＇s agro-ecosystem and its sub-systems, including agricultural land use, livestock breeding and rural life. The results show that from 1980 to 2013, both the carbon input and output were growing gradually, with the carbon input doubling from 1.6 Pg C/year in 1980 to 3.4 Pg C/year in 2013, while carbon output grew from 2.2 Pg C/year in 1980 to 3.8 Pg C/year in 2013. From 1980 to 2013, the crop production system in China has remained a carbon source, and the agricultural land uses were also almost all carbon sources instead of carbon sinks. As soil carbon stock plays a very important role in deciding the function of China＇s agro-ecosystem as a carbon sink or source, practices that can promote carbon storage and sequestration will be an essential component of low carbon agriculture development in China.

关键词： Substance flow analysis Greenhouse gas emissions Carbon source Agro-ecosystem China

WHU-Grace01s:A new temporal gravity field model recovered from GRACE KBRR data alone

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Geodesy and Geodynamics 2015年第5期6卷 316-323页

作者： Zhou Hao Luo Zhicai Zhong Bo School of Geodesy and Geomatics Wuhan Uniuersity Key Laboratory of Geospace enuironment and Geodesy Ministry of Education

A new temporal gravity field model called WHU-Grace01s solely recovered from Gravity Recovery and Climate Experiment （GRACE） K-Band Range Rate （KBRR） data based on dynamic integral approach is presented in this paper. After meticulously preprocessing of the GRACE KBRR data, the root mean square of its post residuals is about 0.2 micrometers per second, and seventy-two monthly temporal solutions truncated to degree and order 60 are computed for the period from January 2003 to December 2008. After applying the combi- nation filter in WHU-Grace01s, the global temporal signals show obvious periodical change rules in the large-scale fiver basins. In terms of the degree variance, our solution is smaller at high degrees, and shows a good consistency at the rest of degrees with the Release 05 models from Center for Space research （CSR）, GeoForschungsZentrum Potsdam （GFZ） and Jet Pro- pulsion Laboratory 0PL）. Compared with other published models in terms of equivalent water height distribution, our solution is consistent with those published by CSR, GFZ, JPL, Delft institute of Earth Observation and Space system （DEOS）, Tongji University （Tongji）, institute of Theoretical Geodesy （ITG）, Astronomical institute in University of Bern （AIUB） and Groupe de Recherche de Geodesie Spatiale （GRGS}, which indicates that the accuracy of WHU-Grace01s has a good consistency with the previously published GRACE solutions.

关键词： Temporal gravity field model Gravity Recovery and Climate Experiment （GRACE） Dynamic integral approach K-Band Range Rate （KBRR） Satellite gravity Spherical harmonics Equivalent water height Geopotential determination

Export of dissolved carbonaceous and nitrogenous substances in rivers of the “Water Tower of Asia”

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Journal of Environmental Sciences 2018年第3期30卷 53-61页

作者： Bin Qu Mika Sillanpaa Shichang Kang Fangping Yan Zhiguo Li Hongbo Zhang Chaoliu Li Laboratory of Green Chemistry Lappeenranta University of Technology Mikkeli 50130 Finland Key Laboratory of Tibetan enuironment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering research institute Chinese Academy of Sciences Lanzhou Gansu 730000 China Shangqiu Normal University Shangqiu He'nan 476000 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100085 China

Rivers are critical links in the carbon and nitrogen cycle in aquatic,terrestrial,and atmospheric environments.Here riverine carbon and nitrogen exports in nine large rivers on the Tibetan Plateau—the＂Water Tower of Asia＂—were investigated in the monsoon season from 2013 to 2015.Compared with the world average,concentrations of dissolved inorganic carbon（DIC,30.7 mg/L）were high in river basins of the plateau due to extensive topographic relief and intensive water erosion.Low concentrations of dissolved organic carbon（DOC,1.16 mg/L）were likely due to the low temperature and unproductive land vegetation environments.Average concentrations of riverine DIN（0.32 mg/L）and DON（0.35 mg/L）on the Tibetan Plateau were close to the world average.However,despite its predominantly pristine environment,discharge from agricultural activities and urban areas of the plateau has raised riverine N export.In addition,DOC/DON ratio（C/N,~6.5）in rivers of the Tibetan Plateau was much lower than the global average,indicating that dissolved organic carbon in the rivers of this region might be more bioavailable.Therefore,along with global warming and anthropogenic activities,increasing export of bioavailable riverine carbon and nitrogen from rivers of the Tibetan Plateau can be expected in the future,which will possibly influence the regional carbon and nitrogen cycle.

关键词： Dissolved carbon Dissolved nitrogen Rivers The Tibetan Plateau

Arsenic and cadmium removal from water by a calcium-modified and starch-stabilized ferromanganese binary oxide

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Journal of Environmental Sciences 2020年第10期32卷 186-193页

作者： Huxing Chen Fangnan Xu Zhengzheng Chen Ouyuan Jiang Williamson Gustave Xianjin Tang School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China institute of Soil and Water Resources and enuironmental Science Zhejiang Prouincial Key Laboratory of Agricultural Resources and EnuironmentZhejiang UniuersityHangzhou 310058China School of Chemistry Enuironmental&Life SciencesUniuersity of The BahamasNew ProuidenceNassauThe Bahamas

A new calcium-modified and starch-stabilized ferromanganese binary oxide (Ca-SFMBO)sorbent was fabricated with different Ca concentrations for the adsorption of arsenic (As)and cadmium (Cd) in water.The maximum As(Ⅲ) and Cd(Ⅱ) adsorption capacities of 1%CaSFMBO were 156.25 mg/g and 107.53 mg/g respectively in single-adsorption systems.The adsorption of As and Cd by the Ca-SFMBO sorbent was pH-dependent at values from 1 to 7,with an optimal adsorption pH of 6.In the dual-adsorbate system,the presence of Cd(Ⅱ) at low concentrations enhanced As(Ⅲ) adsorption by 33.3%,while the adsorption of As(Ⅲ) was inhibited with the increase of Cd(Ⅱ) concentration.Moreover,the addition of As(Ⅲ) increased the adsorption capacity for Cd(Ⅱ) up to two-fold.Through analysis by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR),it was inferred that the mechanism for the co-adsorption of Cd(Ⅱ) and As(Ⅲ) included both competitive and synergistic effects,which resulted from the formation of ternary complexes.The results indicate that the Ca-SFMBO material developed here could be used for the simultaneous removal of As(Ⅲ) and Cd(Ⅱ) from contaminated water.

关键词： Arsenic Cadmium Calcium Fe–Mn binary oxide Complexation Adsorption