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A new FTO/TiO_(2)/PbO_(2)electrode for eco-friendly electrochemical determination of chemical oxygen demand

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Nano Research 2023年第8期16卷 11042-11047页

作者： Lei Wang Yuehan Zhang Xiaoxuan Sun Yunhui Li Junfeng Zhai Shaojun Dong School of Chemistry and Environmental Engineering Changchun University of Science and TechnologyChangchun 130022China Zhongshan Institute of Changchun University of Science and Technology Zhongshan 528437China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China College of Chemistry Jilin UniversityChangchun 130012China

Eco-friendly chemical oxygen demand(COD)sensors are highly desired with respect to the importance of COD determination in environmental *** this work,a new FTO/TiO_(2)/PbO_(2)(FTO=fluorine-doped tin oxide)electrode was fabricated with a two-step method and used as an eco-friendly electrochemical COD *** interlayer TiO_(2)was employed to strengthen the adhesion of PbO_(2)on the FTO substrates by providing a large TiO_(2)/PbO_(2)interface *** effects of the factors including applied potential,supporting electrolyte concentration and stirring speed on the sensing performance were *** the optimized conditions,linear responses to the COD of water with different COD sources were achieved,and a linear range from 5 to 120 mg/L was obtained in the case of sucrose as the COD *** relative standard deviations(RSD)were determined to be less than 9%for the glucose solutions with the COD of 7.5,12.5 and 17.5 mg/*** real sample analysis,the obtained results were comparable with those measured with the conventional dichromate method,with a relative error less than 11%.

关键词： chemical oxygen demand organic pollution chloride interference PbO_(2)electrode

Study on Determination of chemical oxygen demand in Water with Ion Chromatography

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Chinese Journal of Chemistry 2007年第2期25卷 228-232页

作者：张中海丁红春方艳菊鲜跃仲金利通 Department of Chemistry East China Normal University Shanghai 200062 China

A new method for determining chemical oxygen demand （COD） value in water using ion chromatography coupled with nano TiO2-K2S2O8 co-existing system was described. The photocatalytic oxidation system and nano TiO2-K2S2O8 co-existing system could degrade the organic compounds in water. All sulfur-containing species in the reactive solution were eventually transformed to sulfate which could be determined by conductivity detector in ion chromatography. The change of conductivity of sulfate was proportional to COD value. The optimal experimental conditions and the mechanism of the detection were discussed. The application range was 10.0-300.0 mg·L^-1 and the lowest limit of detection was 3.5 mg·L^-1. It was considered that the value obtained could be reliably correlated with the COD value obtained using the conventional methods.

关键词： ion chromatography chemical oxygen demand nano TiO2-K2S2O8

Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary

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Chinese Journal of Oceanology and Limnology 2007年第3期25卷 254-260页

作者：高学鲁宋金明李宁李学刚 Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences

A field observation was carried out in the Changjiang (Yangtze) River Estuary from May 19 to 26, 2003. A total of 29 stations, including 2 anchored stations, were occupied through almost the whole salinity gradient. Based on the observation data, biogeochemistry of chemical oxygen demand (COD) was examined. Spatial distribution pattern of COD shows that it decreased downstream. The COD concentration varied generally within a narrow range of 1.24–1.60 mg/L in the zone around the river mouth, beyond which it decreased rapidly to 0.20 mg/L. In the mixed water zone, the fluctuation in COD was smaller at 2 m above the bottom layer than at the surface layer in 48 h. In the seawater zone, the 48-h fluctuation at the surface was the largest, followed by that of 5 m below the surface and 2 m above the bottom layers in a range of from 2.50 to 0.55 mg/L. Freshwater discharge was the dominant source of COD in the estuary. The average COD beyond the river mouth was 2.7 mg/L, which accorded with the Chinese seawater quality Grade I. Relationships between dissolved oxygen and biogeochemical parameters such as suspended particulate matter, dissolved organic matter and chlorophyll-a were also discussed.

关键词： spatial distribution diurnal variation chemical oxygen demand the Changjiang (Yangtze) River Estuary

Rapid microwave determination of chemical oxygen demand of aromatic-based tar-wash wastewaters from biomass gasification

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Rapid microwave determination of chemical oxygen demand of a...

Application of a novel backwashing process in upflow biological aerated filter

2018中国环境科学学会科学技术年会

作者： Mei-juan Xu Chang-xing Hu Min-yan Qin Fu-yan Gao Wei Li Yue-li Hao Warren A.Dick Ningbo Institute of Technology Zhejiang University College of Environmental Sciences and Engineering Nankai University School of Environment and Natural Resources The Ohio State University

A rapid microwave method was developed to measure COD in aromatic-based tar-wash wastewaters from biomass *** were microwave digested for only 32 min at 720 W or 18 min at 1200 W in an acidic K Cr O-Ag SO-HgSO solution,followed by spectrophotometric quantification of unreacted reactant Cr at 455 nm from 50 to 200 mg L COD or of generated product Cr at 599 nm from 200 to 1000 mg L *** with the theoretical COD obtained by GC-MS analysis,the microwave COD value was slightly lower for the cornstraw gasification-derived wastewater sample containing 6.3%hard-to-digest COD,mainly due to *** microwave COD value was even lower for the sawdust gasification-derived wastewater sample containing 28%hard-to-digest COD mainly due to toluene and ***,the microwave digestion method-yielded similar COD values as the standard two-hour open reflux for both *** interference was not observed even though both samples contained significant amounts of NH and *** of the high COD raw wastewater sample into the above measurable ranges did not bias the *** coefficients of variation of triplicate samples’ COD values were below 5%.Therefore,the microwave method was rapid,applicable for high COD samples,free of ammonium interference,precise,and as accurate as the standard open reflux method.

关键词： chemical oxygen demand dichromate open reflux digestion microwave digestion biomass gasification tar-wash wastewater

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Journal of Environmental Sciences 2010年第3期22卷 362-366页

作者： Jinshui Yang Weijie Liu Baozhen Li Hongli Yuana Meiping Tong Jinsong Gao State Key Laboratory for A grobiotechnology College of Biological Sciences Key Laboratory of Agro-Microbial Resource and Application Ministry of Agriculture China Agricultural University Beijing 100193 China. The key Laboratory of Water and Sediment Sciences Ministry of Education Department of Environmental Engineering Peking University Beijing 100871 China Changsha Medical College Changsha 410219 China

To improve the efficiency of backwashing in upflow biological aerated filter （BAF）, a novel backwashing process named air-water siphon backwashing （AWSB） was proposed and applied on laboratory scale. The effects of backwashing on turbidity and suspended solid （SS） in backwashing efluent using this new backwashing process were compared with those of traditional backwashing process, namely air-water backwashing （AWB）. In AWB, the turbidity of backwashing efluent maintained 100 NUT when consumed 60 min and 10.5 L water. However, in AWSB, it declined to 44 NUT, consumed 40 min, and 7 L water. The COD removal of BAF after backwashing was also analyzed. The average removal rate of COD in the reactor backwashed by AWB and AWSB was 89.34% and 90.91%, respectively. Compared with AWB, the backwashing interval had been prolonged 35%. The volume of backwashing water in that AWSB was only 66.7% of that in AWB. The results demonstrated that AWSB required less water and took shorter backwashing timerelative to AWB to achieve the same turbidity of backwashing efluent, and AWSB was more effective in removing fouling than that of AWB. More significant advantage of AWSB was that the backwashing interval was effectively prolonged

关键词： biological aerated filter air-water siphon backwashing chemical oxygen demand

Flocculation behaviors of a novel papermaking sludge-based flocculant in practical printing and dyeing wastewater treatment

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 283-293页

作者： Kangying Guo Baoyu Gao Jie Wang Jingwen Pan Qinyan Yue Xing Xu Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao266237China

In our previous studies,several papermaking sludge-based flocculants(PSBFs)were synthesized from wood pulp papermaking *** structure-activity relationships of the PSBFs have been investigated in simulated dye wastewater treatment,but their efficiencies in practical printing and dyeing wastewater(PPDW)treatment are ***,an PSBF was prepared,and its performance is discussed in comparison to polyaluminium chloride(PAC)and polyacrylamide(PAM)in PPDW *** PSBF was used in three ways:as an independent flocculant,as a PAC aid,or used to treat the effluent of the PAC *** results indicated that adding PSBF alone produced similar color and chemical oxygen demand(COD_(Cr))removals as the PAC system alone,but PSBF performed better than PAC when the pH of PPDW was higher than *** PSBF as a PAC aid improved the color,COD_(Cr)and turbidity removals,but the elimination efficiencies were slightly lower than those of the PAC+PAM ***,when PSBF was used as a flocculant to treat the effluent of the PAC system(PAC→PSBF),the effluent qualities were *** with the PAC system,the color and COD_(Cr)removals of PAC→PSBF system increased by 16.21%and 13.26%,*** excitation and emission matrix fluorescence results indicated that PSBF removed tryptophan-like pollutants more efficiently than *** the pH requirements of the subsequent bioreactor treatment in practice,the PAC→PSBF system were also investigated at the PPDW pH level of *** maximum removal efficiencies of color,COD_(Cr)and turbidity were 90.17%,32.60%and 82.50%,respectively.

关键词： Practical wastewater treatment Commercial coagulant/flocculant Secondary coagulation-flocculation process chemical oxygen demand Coagulation-flocculation mechanism

MILP synthesis of separation processes for waste oil-in-water emulsions treatment

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Frontiers of chemical Science and Engineering 2016年第1期10卷 120-130页

作者： Zorka N. Pintaric Gorazd P. Skof Zdravko Kravanja Faculty of Chemistry and chemical Engineering University of Maribor Smetanova ulica 17 SI-2000 Maribor Slovenia EKOLID Ekologko svetovanje Raziskave in razvoj Ru~ka cesta 55 SI-2000 Maribor Slovenia

This paper presents a novel synthesis method for designing integrated processes for oil-in-water （O/W） emulsions treatment. General superstructure involving alternative separation technologies is developed and modelled as a mixed integer linear programming （MILP） model for maximum annual profit. Separation processes in the superstructure are divided into three main sections of which the pretreatment and final treatment are limited to the selection of one altemative （or bypass） only, while within the intermediate section various combinations of different technologies in series can be selected. Integrated processes composed of selected separation techniques for given ranges of input chemical oxygen demand （COD） can be proposed by applying parametric analyses within the superstructure approach. This approach has been applied to an existing industrial case study for deriving optimal combinations of technologies for treating diverse oil-in- water emulsions within the range of input COD values between 1000 mg-L-1 and 145000 mgL t. The optimal solution represents a flexible and profitable process for reducing the COD values below maximal allowable limits for discharging effluent into surface water.

关键词： oil-in-water emulsion chemical oxygen demand superstructure process synthesis MILP

Water quality prediction of copper-molybdenum miningbeneficiation wastewater based on the PSO-SVR model

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Frontiers of Environmental Science & Engineering 2023年第8期17卷 81-94页

作者： Xiaohua Fu Qingxing Zheng Guomin Jiang Kallol Roy Lei Huang Chang Liu Kun Li Honglei Chen Xinyu Song Jianyu Chen Zhenxing Wang Ecological Environment Management and Assessment Center Central South University of Forestry and TechnologyChangsha 410004China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China Chinese Non-Ferrous Industrial Engineering Center of Pollution Control Technology&Equipment Science Environment Protection Co.Ltd.Changsha 410036China Institute of Computer Science University of TartuTartu 51009Estonia School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China A.B Freeman School of Business Tulane UniversityNew OrleansLA 70118USA Guangzhou Huacai Environmental Protection Technology Co. Ltd.Guangzhou 511480China

The mining-beneficiation wastewater treatment is highly complex and *** factors like influent quality,flow rate,pH and chemical dose,tend to restrict the effluent effectiveness of miningbeneficiation wastewater *** oxygen demand(COD)is a crucial indicator to measure the quality of mining-beneficiation *** COD concentration accurately of miningbeneficiation wastewater after treatment is essential for achieving stable and compliant *** reduces environmental risk and significantly improves the discharge quality of *** paper presents a novel AI algorithm PSO-SVR,to predict water *** optimization of our proposed model PSO-SVR,uses particle swarm optimization to improve support vector regression for COD *** generalization capacity tested on out-of-distribution(OOD)data for our PSOSVR model is strong,with the following performance metrics of root means square error(RMSE)is 1.51,mean absolute error(MAE)is 1.26,and the coefficient of determination(R2)is *** compare the performance of PSO-SVR model with back propagation neural network(BPNN)and radial basis function neural network(RBFNN)and shows it edges over in terms of the performance metrics of RMSE,MAE and R2,and is the best model for COD prediction of mining-beneficiation *** is because of the less overfitting tendency of PSO-SVR compared with neural network *** proposed PSO-SVR model is optimum for the prediction of COD in copper-molybdenum mining-beneficiation wastewater *** addition,PSO-SVR can be used to predict COD on a wide variety of wastewater through the process of transfer learning.

关键词： chemical oxygen demand Mining-beneficiation wastewater treatment Particle swarm optimization Support vector regression Artificial neural network

Recyclable Joule heated low shrinkage carbon nanofiber aerogels for microscale oil/water separation

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Journal of Materials Science & Technology 2022年第32期127卷 89-97页

作者： Guangkai Hu Dong Liu Sidi Yin Bin Yu Tao Huang Hao Yu Meifang Zhu State Key Laboratory for Modification of chemical Fibers&Polymer Materials College of Materials Science&EngineeringDonghua UniversityShanghai 201620China

Aerogels have shown great potential as oil adsorbents but their application to the removal of microscale oil from water and their recycling remains *** present work proposed a freeze-shaping method for fabricating carbon nanofiber aerogels(CNFAs)based on the direct use of one-dimensional(1D)carbon nanofibers(CNF)rather than carbonization of polymer *** technique greatly reduces volume shrinkage and increases the three-dimensional(3D)structural stability of the *** nanotubes(CNT)and gelatinized starch were incorporated in these aerogels as a conductive enhancement agent and binder,respectively,forming a“vine(CNT)-wrapped tree(CNF)”structure that improved mechanical and Joule-heating *** effects of glutaraldehyde added to aerogels as a crosslinking agent on mechanical properties and microstructure were also systematically *** optimized CNFAs combined with low density,high porosity,good elasticity,and superior Joule-heating efficiency along with suitable adsorption capacity,excellent selectivity,and cycling *** material was able to selectively remove 87%and 92%of microscale acetone and dimethylformamide(DMF),respectively,from the water after nine cycles of adsorption and *** present work demonstrates a novel means of designing and fabricating a low shrinkage CNFA with outstanding Joule-heating performance having potential practical applications in the remediation of organic pollution.

关键词： Electrospinning Carbon nanofiber aerogel Volume shrinkage Joule-heating chemical oxygen demand