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Investigation of the Buffering Function of Aluminum being in Equilibrium with the Mineral Kaolinite in Acidic Natural Water

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Chinese Chemical Letters 2000年第7期11卷 655-658页

作者： Feng LIU Shu ping BI Ning GAN(Department of Chemistry, state key laboratory of {3. control & resource reuse,nanjing University, nanjing 2.0093) Department of Chemistry State Key Lab. Poll. Contr. Rsrc. R. Nanjing University Nanjing 210093 China

This paper presents a computer model to investigate the buffering function of aluminum being in equilibrium with mineral kaolinite in acidic natural water. Factors affecting the theoretical pH values are discussed. Th... 详细信息

关键词： kaolinite aluminum buffering function

Microwave photocatalytic degradation of rhodamine B using TiO_2 supported on activated carbon:Mechanism implication

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Journal of Environmental Sciences 2009年第2期21卷 268-272页

作者： HE Zhong,YANG Shaogui,JU Yongming,SUN Cheng state key laboratory of {3. control and resource reuse,School of the Environment,nanjing University,nanjing 2.0093,China. state key laboratory of {3. control and resource reuse School of the Environment Nanjing University Nanjing 210093 China

The photocatalytic degradation of rhodamine B （rhB） was carried out using TiO2 supported on activated carbon （TiO2-AC） under microwave irradiation. Composite catalyst TiO2-AC was prepared and characterized using X-ray diffraction （XrD）, transmission electron microscopy （TEM） and Brunauer-Emmett-Teller （BET）. In the process of microwave-enhanced photocatalysis （MpC）, rhB （3. mg/L） was almost completely decoloured in 10 min, and the mineralization efficiency was 96.0% in 20 min. The reaction rate constant of rhB in MpC using TiO2-AC by pseudo first-order reaction kinetics was 4.16 times of that using Degussa p25. Additionally, according to gas chromatography/mass spectrometry （GC/MS） and liquid chromatography/mass spectrometry （LC/MS） identification, the major intermediates of rhB in MpC included two kinds of N-de-ethylation intermediates （N,N-diethyl-N＇-ethyl-rhodamine （DEr））, oxalic acid, malonic acid, snccinic acid, and phthalic acid, maleic acid, 3.nitrobenzoic acid, and so on. The degradation of rhB in MpC was mainly attributed to the destruction of the conjugated structure, and then the intermediates transformed to acid molecules which were mineralized to water and carbon dioxide.

关键词： microwave photocatalytic WiO2, activated carbon rhodamine B degradation mechanism

A novel aminated polymeric adsorbent for removing refractory dissolved organic matter from landfill leachate treatment plant

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Journal of Environmental Sciences 2009年第8期21卷 1089-1095页

作者： ZHANG Long, LI Aimin, WANG Jinnan, LU Yufei, ZHOU Youdong state key laboratory of {3. control and resource reuse, School of the Environment, nanjing University, nanjing 2.0093, China. state key laboratory of {3. control and resource reuse School of the Environment Nanjing University Nanjing 210093 China

refractory dissolved organic matter （DOM） from landfill leachate treatment plant was with high dissolved organic carbon （DOC） content. An aminated polymeric adsorbent NDA-8 with tertiary amino groups and sufficient mesopore was synthesized, which exhibited high adsorption capacity to the DOM （raw water after coagulation）. resin NDA-8 performed better in the uptake of the DOM than resin DAX-8 and A100. Electrostatic attraction was considered as the decisive interaction between the adsorbent and adsorbate. Special attention was paid to the correlation between porous structure and adsorption capacity. The mesopore of NDA-8 played a crucial role during uptake of the DOM. In general, resin in chloride form performed a higher removal rate of DOC. According to the colunm adsorption test, total adsorption capacity of NDA-8 was calculated to 52.28 mg DOC/mL wet resin. 0.2 mol/L sodium hydroxide solution could regenerate the adsorbent efficiently.

关键词： electrostatic interactions chemically modified resin coagulation adsorption pore structure

Effect of high-strength ammonia nitrogen acclimation on sludge activity in sequencing batch reactor

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Journal of Environmental Sciences 2010年第11期22卷 1683-1688页

作者： Feifei Wang, Yuanhong Ding, Lei Ge, Hongqiang ren, Lili Ding state key laboratory of {3. control and resource reuse, School of the Environment, nanjing University, nanjing 2.0093, China. state key laboratory of {3. control and resource reuse School of the Environment Nanjing University Nanjing 210093 China

The effect of high-strength ammonia nitrogen acclimation on sludge activity in sequencing batch reactor （SBr） was investigated. Two batch experiments, rUN1 and rUN2, were conducted with the influent ammonia nitrogen concentrations 60 and 500 mg/L, respectively. The sludges inoculated from rUN1 and rUN2 were used to treat a series of influent with ammonia nitrogen concentrations of 59, 23., 3.8, 604 and 1152 mg/L. It is found that the activated sludge acclimated to higher ammonia nitrogen concentrations revealed higher COD and NH 4 ＋ -N removal efficiencies, and slower DHA decrease. The results confirmed that the activities of the bacteria in activated sludge in SBr were inhibited by high-strength ammonia nitrogen, whereas the activated sludge acclimated to high-strength ammonia nitrogen showed substantial resistance to inhibition by influents containing high levels of ammonia nitrogen.

关键词： activated sludge sequencing batch reactor high-strength ammonia nitrogen dehydrogenase activity

Excavation and characterization of refuse in closed landfill

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Journal of Environmental Sciences 2002年第3期14卷 303-308页

作者： ZHAO You cai (The state key laboratory of {3. control and resource reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. ) The state key laboratory of {3. control and resource reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China E-mail:zyclmk @ online***

refuse in landfills becomes stabilized as organic matter in refuse degrades and soluble inorganic substances dissolve during their long term stabilization process. In this paper, this process is also referred to as mineralization process and the resultant stabilized refuse referred to as aged refuse. Aged refuse contains a wide spectrum and huge quantity of microorganisms with strong decomposition capability for refractory organic matter present in some wastewater such as leachate. In this study, aged refuse excavated from 2 to 10 years old closed landfill compartments in Shanghai refuse Landfill is characterized in terms of particulate distribution by screening, total nitrogen, total phosphorus, biodegradable matter. The approaches for redevelopment of both land and aged refuse in the stabilized landfills are proposed.

关键词： landfill refuse mineralization

EXpErIMENT OF IMpACT OF rIVEr HYDrAULIC CHArACTErISTICS ON NUTrIENTS pUrIFICATION COEFFICIENT

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Journal of Hydrodynamics 2007年第3期19卷 387-393页

作者： WANG pei-fang WANG Xiao-rong WANG Chao state key laboratory of {3. control and resource reuse School of Environment Nanjing University Nanjing 210093 China state key laboratory of Hydrology-Water {3.s and Hydraulic Engineering Hohai University Nanjing 210098 China key laboratory of Intergrated regulation and resource Development on Shallow Lakes College of Environmental Science and Engineering Hohai University Nanjing 210098 China

Hydraulic characteristics of a river are the key factors for river water quality improvement and river restoration. A simulated river was exploited to study the interactions between water contaminant purification coefficients and the characteristics of the river, such as the cross-section velocity, water depth, reynolds number, and Froude number. To enhance the purification capacity of the river, detritus with 5 mm to 10 mm in diameter and contact surface area per volume of 87.6 m^2/m^3.were constructed naturally at the bed and along one side of the bank to form half shape of the river cross-section. During the one-month experiment （including 3.periods） from the third of November to the fourth of December, 2005, three categories of hydraulic conditions were investigated. results show that the purification coefficient （K） of Total Nitrogen （TN） is closely coherent with the hydraulic retention time （T）, river length （L）, reynolds number （re） and Froude number （Fr）. The relationship of K and T generally agrees with the power law under the three experimental water hydraulic conditions. Based on these results, the optimal re and Fr ranges can be obtain to serve as a guideline for ecological re-engineering design to improve river water quality and restore river ecosystem.

关键词： Hydraulic characteristics total nitrogen,purification coefficient interaction simulated river

Holographic QSAr of estradiol derivatives

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Chinese Science Bulletin 2003年第7期48卷 642-645页

作者： CUI Shihai, LIU Shushen, WANG Xiaodong & WANG Liansheng state key laboratory of {3. control and resource reuse, School of Environment, nanjing University, nanjing 2.0093, China state key laboratory of {3. control and resource reuse School of Environment Nanjing University Nanjing 210093 China

Holographic QSAr model is constructed to predict relative binding affinities of estradiol derivatives with lamb uterine estrogen receptor. The method does not require the generation of three-dimensional structure of the compounds. The factors that influence the quality of QSAr model are discussed. The result indicates that the model has good predictability and yields a high q2LOO value of 0.897. Compared to other QSAr methods, the HQSAr technique is suitable for use in screening large database of chemicals.

关键词：雌二醇衍生物全息结构性质相关性内分泌紊乱化合物紊药物分析

Adsorption of surfactants onto acrylic ester resins with different pore size distribution

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Science China Chemistry 2006年第5期49卷 445-453页

作者： YANG Weiben1,2,3.LI Aimin1,3.CAI Jianguo1,3.MENG Guanhua1,3.& ZHANG Quanxing1,3.1. state key laboratory of {3. control and resource reuse,School of the Environment,nanjing University,nanjing 2.0093,China 2. nanjing College of Chemical Technology,nanjing 210048,China 3. Jiangsu Engineering & Technology research Center for Organic Toxicant control and resource reuse,nanjing 21003.,China state key laboratory of {3. control and resource reuse School of the Environment Nanjing University Nanjing China nanjing College of Chemical Technology Nanjing China Jiangsu Engineering & Technology research Center for Organic Toxicant control and resource reuse Nanjing China

In this study, a series of acrylic ester resins with different pore size distribution were prepared successfully by varying the type and the amount of pore-forming agents. In order to inves-tigate the adsorption behavior and mechanism of surfactants on acrylic ester resins, three kinds of surfactants were utilized as adsorbates that were sodium 6-dodecyl benzenesulfonate (6-NaDBS), sodium 1-dodecyl benzene sulfonate (1-NaDBS) and sodium 1-dodecyl sulfonate, respectively. It was observed that the surface area was available in a particular pore size and an appropriate pore size of resins appeared to be more important for the adsorption of surfactants. As compared to commercial acrylic ester resins XAD-7 and Hp2MG, 50# and 3.# resins exhibited more excellent adsorption properties toward 1-NaDBS and 6-NaDBS. The experimental equilibrium data were fitted to the Langmuir, and double-Langmuir models. Two models provided very good fittings for all resins over the temperature range studied. The investigation indicated that electrostatic attraction and hydrogen bond between resins and surfactants were the main forces and had an obvious effect on adsorption proc-ess.

关键词： acrylic ester resin, surfactant, adsorption, pore size distribution, isotherm.

Nitrogen and phosphorus removal under intermittent aeration conditions

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Journal of Environmental Sciences 2002年第4期14卷 541-546页

作者： XIA Si\|qing, GAO Ting\|yao, ZHOU Zeng\|yan (state key laboratory of {3. control and resource reuse, Tongji University, Shanghai 200092, China.) Tongji University State Key Laboratory of Pollution Control and Resource Reuse 上海 200092 Tongji University State Key Laboratory of Pollution Control and Resource Reuse 上海 200092

A practice wastewater treatment plant was operated using intermittent aeration activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of COD Cr , BOD 5, TN, Tp, NH 3.|N, TKN, and SS varied in a range of 207.5—1640 mg/L, 61.8—63. mg/L, 28.5—75.6 mg/L, 4.3.—20.2 mg/L, 13.6—3..9 mg/L, 28.5—75.6 mg/L, and 111—1208 mg/L, the effluent means were less than 50 mg/L, 20 mg/L, 5 mg/L, 1.0 mg/L, 5 mg/L, 10 mg/L, and 20 mg/L, respectively. Based on a long time of operating results, this process is very suitable for nutrient biological removal for treating the municipal wastewater those water characteristics are similar as that of the Songjiang Municipal Waste Water Treatment plant(SJMWTp).

关键词： intermittent aeration process high concentration activated sludge nitrogen removal phosphorus removal