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pH effect on stabilization/solidification of industrial heavy metal sludge

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Acta Geochimica 2006年第S1期 86-87页

作者： Huili LIU1,2, Kaixuan ZOU3, Yinian ZHU1 1 Department of resources and environmental Engineering, Guilin university of Technology, Guilin 541004, china 2 state key laboratory of pollution control and resources reuse, school of the environment, nanjing university, nanjing 210093, china 3 Industrial Waste Treatment Station of Baoan District, Shenzhen City, Shenzhen 518101, china

BINARY COMPETITIVE AND COOPERATIVE ADSORPTION OF AROMATIC COMPOUNDS ON POLYMERIC RESINS

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Chinese Journal of Polymer Science 2005年第5期23卷 503-511页

作者： Wei-ming Zhang Jin-long Chen Bing-cai Pan Quan-xing Zhang state key laboratory of pollution control and resources reuse,school of the environment,nanjing university,nanjing 210093,china nanjing Univ Sch Environm State Key Lab Pollut Control & Resources Reuse Nanjing 210093 Peoples R China

The adsorption behaviors of 2-naphthalenesulfonic acid and aniline on a conventional macroporous resin Amberlite XAD4 and the other two newly-developed hypercrosslinked resins NDA101 and NDAI00 were investigated in a single or binary batch system at 293 K and 313 K, respectively. All the adsorption isotherms of 2-naphthalenesulfonic acid and aniline on the test resins in both systems can fit well with the Langmuir equation, indicating that the adsorption is a favorable process. At the identical equilibrium concentration, the amount of aniline adsorbed on polymeric resins in the single system is higher than that in the binary system because of the competitive adsorption between 2-naphthalenesulfonic acid and aniline on the resin surface. However, the uptake amount of 2-naphthalenesulfonic acid in the binary system is markedly larger than that in the single system, which is presumably due to the cooperative effect arisen from the electrostatic interaction between 2-naphthalenesulfonic acid and aniline adsorbed on the resin surface. The simultaneous adsorption system was proven to be helpful for the selective adsorption toward 2-naphthalenesulfonic acid due to its larger selective index.

关键词： Polymeric resin 2-Naphthalenesulfonic acid Aniline Competitive adsorption Cooperative adsorption.

Phytotoxicity of four herbicides on Ceratophyllum demersum,Vallisneria natans and Elodea nuttallii

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Journal of environmental Sciences 2009年第3期21卷 307-312页

作者： PAN Huiyun,LI Xiaolu,XU Xiaohua,GAO Shixiang state key laboratory of pollution control and Resource reuse,school of the environment,nanjing university,nanjing 210093,china. [a]state key laboratory of pollution control and Resource reuse School of the Environment Nanjing University Nanjing 210093 China

The physiological effects of 4 herbicides （butachlor, quinclorac, bensulfuron-methyl and atrazine） on 3 submerged macrophytes （Ceratophyllum demersum, Vallisneria natans and Elodea nuttallii） were tested in laboratory. The variables of the relative growth rate and the photosynthetic pigment content showed that all of the tested herbicides affected the growth of the plants obviously, even at the lowest concentration （0.0001 mg/L）. Except for the C. demersum treated with quinclorac at 0.005 and 0.01 mg/L, the relative growth rates of the plants were inhibited significantly （p 〈 0.01）. Statistical analysis of chlorophyll a （Chl-a） contents was carded out with both the t-test and one-way ANOVA to determine the difference between the treatment and control. The results showed that Chl-a contents of the plants in all treatment groups were affected by herbicides significantly, except for the C. demersum treated with bensulfuron-methyl at 0.0005 mg/L. The decrease in Chl-a content was positively correlated to the dosage of the herbicides in most treatment groups. It was suggested that herbicides in water bodies might potentially affect the growth of aquatic macrophytes. Since the Chl-a content of submerged macrophytes responded to the stress of herbicides sensitively and directly, it could be used as a biomaker in environmental monitoring or in the ecological risk assessment of herbicide contamination.

关键词： phytotoxicity herbicides submerged macrophyte ecological risk assessment

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 pollution control and Resource reuse,school of the environment,nanjing university,nanjing 210093,china. state key laboratory of pollution 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 （30 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 pollution control and Resource reuse, school of the environment, nanjing university, nanjing 210093, china. [a]state key laboratory of pollution 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 pollution control and Resource reuse, school of the environment, nanjing university, nanjing 210093, china. [a] state key laboratory of pollution control 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, 232, 368, 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

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 pollution control and Resource reuse School of Environment Nanjing University Nanjing 210093 China state key laboratory of Hydrology-Water resources 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 pollution control and Resource reuse, school of environment, nanjing university, nanjing 210093, china 1. state key laboratory of pollution 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

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 pollution control & Resource reuse,nanjing university, nanjing 210093) nanjing Univ Dept Chem State Key Lab Pollut Control & Resource Reuse Nanjing 210093 Peoples R 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