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Biodecolorization and partial mineralization of Reactive Black 5 by a strain of Rhodopseudomonas palustris

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Journal of Environmental Sciences 2008年第10期20卷 1218-1225页

作者： WANG, Xingzu CHENG, Xiang sun, dezhi Qi, Hong School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

A strain of photosynthetic bacterium, Rhodopseudomonas palustris W1, isolated from a lab-scale anaerobic moving bed biofilm reactor (MBBR) treating textile e?uent was demonstrated to decolorize Reactive Black 5 (RB5) effciently under anaerobic condition. By a series of batch tests, the suitable conditions for RB5 decolorization were obtained, namely, pH < 10, light presence, glutamine or lactate as carbon source with concentration more than 500 mg/L when lactate is selected, NH4Cl as a nitrogen source wi...

关键词： decolorization mineralization Reactive Black 5 (RB5) photosynthetic bacterium metabolite analysis

CH_4 emission and conversion from A^2O and SBR processes in full-scale wastewater treatment plants

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Journal of Environmental Sciences 2014年第1期26卷 224-230页

作者： Yan Liu Xiang Cheng Xiaoxiu Lun dezhi sun College of Environmental Science and Engineering Beijing Forestry University

Wastewater treatment systems are important anthropogenic sources of CH4 emission. A full-scale experiment was carried out to monitor the CH4 emission from anoxic/anaerobic/oxic process （A2O） and sequencing batch reactor （SBR） wastewater treatment plants （WWTPs） for one year from May 2011 to April 2012. The main emission unit of the A2O process was an oxic tank, accounting for 76.2% of CH4 emissions; the main emission unit of the SBR process was the feeding and aeration phase, accounting for 99.5% of CH4 emissions. CH4 can be produced in the anaerobic condition, such as in the primary settling tank and anaerobic tank of the A2O process. While CH4 can be consumed in anoxic denitrification or the aeration condition, such as in the anoxic tank and oxic tank of the A2O process and the feeding and aeration phase of the SBR process. The CH4 emission flux and the dissolved CH4 concentration rapidly decreased in the oxic tank of the A2O process. These metrics increased during the first half of the phase and then decreased during the latter half of the phase in the feeding and aeration phase of the SBR process. The CH4 oxidation rate ranged from 32.47% to 89.52% （mean： 67.96%） in the A2O process and from 12.65% to 88.31% （mean： 47.62%） in the SBR process. The mean CH4 emission factors were 0.182 g/ton of wastewater and 24.75 g CH4/（***） for the A2O process, and 0.457 g/ton of wastewater and 36.55 g CH4/（***） for the SBR process.

关键词： CH4 emission production and consumption wastewater treatment plant A2O SBR

Study of Co-Ce coating and surface on pasted nickel electrodes substrate

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Rare Metals 2006年第z1期25卷 47-50页

作者： WANG Dianlong WANG Chunyu DAI Changsong sun dezhi Post Doctor Workstation of Environmental Protection Technology Corporation Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Post Doctor Workstation of Environmental Protection Technology Corporation Harbin Institute of Technology Harbin 150001 China

The process of electroplating Co-Ce alloys on the nickel foam framework surface can improve electro-conductivity for active materials and nickel substrate interface. The results of inductive coupled plasma emission spectrometer (ICP), cyclic voltammetry (CV), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA) indicate that the Co-Ce coating chemical content of rare earth Ce 0.19wt.%-0.28wt.% can not only alter the microstructure of electroplating coating, but also accelerate the oxidation reaction of Co and improve its transfer rate of electric current conductivity to the active material particles. The grads-like distributing electro-conductive network of CoOOH is formed on the nickel substrate surface, which improves reversibility of pasted nickel electrode. The charging receptivity is improved by Co-Ce coating on the pasted nickel electrode substrate, and its specific discharging capacity is improved by 50%.

关键词： Co-Ce coating surface grades-like distributing electro-conductive networks

Estimation of PM_(10) in the trafc-related atmosphere for three road types in Beijing and Guangzhou, China

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Journal of Environmental Sciences 2014年第1期26卷 197-204页

作者： Yu Wang Jiong Li Xiang Cheng Xiaoxiu Lun dezhi sun Xingzu Wang College of Environmental Science and Engineering Beijing Forestry University Beijing Northland Construction Engineering Co. Ltd

The levels of roadside PM10 in Beijing, China, were investigated in 2011 and 2012 on a seasonal basis to estimate the population exposure to particulates for three road types. The measurements of PM10 were also conducted in the southern Chinese megacity of Guangzhou for comparison purposes. The results showed that roadside PMlo in Beijing correlated strongly with the PM10 background in the urban atmosphere. The levels of PM10 in street canyons were markedly higher than those along the open roads and in crossroad areas because of limited ventilation. An elevation of PM10 was observed in April, which was possibly due to the sand storms that frequently occur in the spring. Based on these observations, roadside PM10 in Beijing could have multiple origins and was to some extent dispersion- governed. In Guangzhou, the roadside PM10 did not closely relate to the background values. The PM10 pollution was greatly affected by local traffic conditions. The simulation of PM10 for different road types was completed during the study period using the Motor Vehicle Emissions Factor Model （MOBILE6.2） as an emission model and the California Line Source Dispersion Model （CALINE4） and Operational Street Pollution Model （OSPM） as dispersion models. The MOBILE6.2/CALINE4 software package was demonstrated to be sufficient for the simulation of PM10 in the open roads and crossroad areas in both Beijing and Guangzhou, and the simulation results of roadside PM10 in the street canyons by the MOBILE6.2/OSPM package were in close agreement with those of the measurements.

关键词： roadside PM10 traffic volume open road crossroad street canyon

Comparative study on the efficiency and environmental impact of two methods of utilizing polyvinyl chloride waste based on life cycle assessments

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Frontiers of Environmental Science & Engineering 2014年第3期8卷 451-462页

作者： Yuehui WU Guoliang WANG Zhen WANG Yi LIU Ping GU dezhi sun School of Municipal & Environmental Engineering Harbin Institute of Technology Harbin 150090 China Environmental Monitoring Center of Heilongjiang Province Harbin 150056 China College of Environmental Science & Engineering Beijing Forestry University Beijing 100083 China

Two processes of utilizing polyvinyl chloride （PVC） waste, an incineration process and a vacuum pyrolysis process, for energy conversion were compared to determine their efficiency and environmental perfor- mance. We carried out a life cycle assessment with each of the two processes to evaluate their environmental impact and defined the goals and limits of our remit. As well, we established an inventory of PVC waste from incineration and vacuum pyrolysis based on process analysis, data collection and calculations. The results show that electrical power output per unit mass of PVC waste in the incineration process was twice as high as that of the vacuum pyrolysis process. Incineration had a larger total environmental impact potential than vacuum pyrolysis. The total environmental impact potential of PVC waste from incineration was three times higher than that from vacuum pyrolysis. Incineration of PVC disposed 300 ng. 100 kgI of dioxins and vacuum pyrolysis 98.19 ng- 100 kgI of dioxins. As well, we analyzed the data for their uncertainty with results quantified in terms of three uncertainties： basic uncertainty, additional uncertainty, and computational uncertainty. The coefficients of variation of the data were less than 25% and the quality of the inventory data was acceptable with low uncertainty. Both PVC waste disposal processes were of similar quality and their results comparable. The results of our life cycle impact assessment （LCIA） showed considerable reliability of our methodology. Overall, the vacuum pyrolysis process has a number advantages and greater potential for development of PVC disposal than the incineration process.

关键词： polyvinyl chloride waste utilization incineration process vacuum pyrolysis process life cycle assess-ment

Research on colored lyotropic liquid crystals

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Chinese Science Bulletin 2005年第15期50卷 1586-1591页

作者： WEI Xilian YIN Baolin sun dezhi LIU Jie WANG Zhongni LI Ganzuo Department of Chemistry Liaocheng University Liaocheng 252059China Key Laboratory of Colloid and Interface Chemistry Ministry of Education Shandong University Jinan 250100 China

Splendidly colored lyotropic liquid crystals formed in the ternary system of a novel cationic surfactant, 3-p-nonylphenoxy-2-hydroxypropyl trimethyl ammonium bromide (NPTAB)-n-butanol-water system, had been ob-served under polarized light microscope. Small-angle X-ray scattering (SAXS), 2H (deuterium) quadrupolar splitting (2H NMR) were employed to confirm the structures of these liq-uid crystals. The structural transformation of these special lyotropic liquid crystals had been confirmed by differential scanning calorimetry (DSC). The influences of liquid crystal film thickness, temperature and conserving time on the color of liquid crystals have been investigated. It is also theoreti-cally discussed for forming and changing of liquid crystal color.

关键词：有色液态晶体三甲基色氨酸溴化物丁醇

New insights into membrane fouling in coagulation-ultrafiltration by cake characteristics analysis:A case study with PACl-Al_(13)and PACl

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Journal of Environmental Sciences 2024年第12期146卷 217-225页

作者： Mingyao Xu Wei Ju Zhenbei Wang Jun Nan Fei Qi Chen Li Yatao Liu Wei Li dezhi sun Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Beijing Forestry University Science Co. Ltd.Beijing 100085China Skate Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Research Center for Eco-environmental Engineering Dongguan University of TechnologyDongguan 523106China

Membrane fouling is a bottleneck issue that hindered the further application of ultrafiltration *** alleviate membrane fouling,coagulation-ultrafiltration(C-UF)process using polyaluminum chloride(PACl)and PACl-Al_(13)with high proportion of Al_(13)O_(4)(OH)_(24)^(7+)as coagulants,respectively,were investigated at various pH *** indicated that an increase in solution pH contributed to larger floc size and looser floc structure for both PACl and PACl-Al_(13).It was conducive to the formation of more porous cake,as evidenced by mean pore area and pore area distribution of cake,leading to lower reversible ***,humic acid(HA)removal presented a trend of first increasing and then decreasing with the increase of *** optimal HA removal was achieved at pH 6 regardless of coagulant type,suggesting that the slightest irreversible fouling should be occurred at this ***,the irreversible fouling with PACl coagulant achieved a minimum value at pH 9,while the minimal irreversible fouling with PACl-Al_(13)was observed at pH *** speculated that the cake formed by PACl could further intercept HA prior to UF process at alkaline ***,compared with PACl,PACl-Al_(13)had a stronger charge neutralization ability,thus contributing to more compact floc structure and higher HA removal at various pH *** UF fractionation measurement,higher HA removal for PACl-Al_(13)was due to higher removal of HA with molecular weight less than 50 kDa.

关键词： Coagultion-ultrafiltration Floc properties Cake characteristics Molecular weight of HA Membrane fouling

FRICTION IN GEAR TEETH UNDER EXTREME PRESSURE LUBRICATION

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Chinese Journal of Mechanical Engineering 1996年第4期9卷 341-344页

作者： sun dezhi Yao Yuquan Ma Xiangui (Northeastern University)

The data measured by using the two-disc tester show that the concentration of EP addi- tives and the viscosity temperature characteristic of lubricant have a cooperation effect on the fric- tion coefficient in boundar... 详细信息

关键词： Additive Bulk temperature Viscosity Boundary lubrication

Development of a whole-cell biosensor based on an ArsR-Pars regulatory circuit from Geobacter sulfurreducens

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Environmental Science and Ecotechnology 2021年第2期6卷 3-10页

作者： Pengsong Li Yumingzi Wang Xin Yuan Xinying Liu Chunmao Liu Xiaofen Fu dezhi sun Yan Dang Dawn E.Holmes Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and EcoremediationCollege of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Key Laboratory of Beijing Yanjing Beer Brewing Technology Beijing Yan Jing Brewery Company Ltd.Beijing 101300China MOST-USDA Joint Research Center for Biofuels Beijing Engineering Research Center for BiofuelsInstitute of New Energy TechnologyTsinghua UniversityBeijing 100084China Department of Physical and Biological Sciences Western New England University1215 Wilbraham RdSpringfieldMA 01119USA

In this study,an Escherichia coli(***)whole-cell biosensor for the specific detection of bioavailable arsenic was developed by placing a green fluorescent protein(GFP)reporter gene under the control of the ArsR1(GSU2952)regulatory circuit from Geobacter *** cells only emitted green fluorescence in the presence of arsenite and were more sensitive to arsenite when they were grown in M9 supplemented medium compared to LB *** optimal test conditions,the Geobacter arsR1 promoter had a detection limit of 0.01 mM arsenite and the GFP expression was linear within a range of 0.03-0.1 mM(2.25-7.5 mg/l).These values were well below World Health Organization’s drinking water quality standard,which is 10 mg/*** feasibility of using this whole-cell biosensor to detect arsenic in water samples,such as arsenic polluted tap water and landfill leachate was *** biosensor was determined to be just as sensitive as atomic fluorescence *** study examines the potential applications of biosensors constructed with Geobacter ArsR-Pars regulatory circuits and provides a rapid and cost-effective tool that can be used for arsenic detection in water samples.

关键词： Arsenic detection Whole-cell biosensor Geobacter sulfurreducens ars operon