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Journal of Environmental Sciences 2006年第3期18卷 420-427页

作者： TIAN Yu ZHENG Lei sun de-zhi department of Environmental Science and Engineering Harbin Institute of Technology Harbin 150090 China.

Extracellular polymeric substances （EPS） are the predominant constituents of activated sludge and represent up to 80% of the mass of activated sludge. They play a crucial role in the flocculation, settling and dewatering of activated sludge. Furthermore, EPS also show great efficiency in binding heavy metals. So EPS are key factors influencing reduction in sludge volume and mass, as well as activity and utilization of sludge. EPS are of considerable environmental interest and hundreds of articles on EPS have been published abroad, while information on EPS in China is limited. In this paper, results of over 60 publications related to constituents and characteristics of EPS and their influences on flocculation, settling and dewatering of sludge are compiled and analyzed. Metal-binding ability of EPS is also discussed, together with a brief consideration of possible research interests in the future.

关键词： activated sludge environmental interest extracellular polymeric substances (EPS)

Formaldehyde degradation by UV/TiO_2/O_3 process using continuous flow mode

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Journal of Environmental Sciences 2007年第9期19卷 1136-1140页

作者： QI Hong sun de-zhi CHI Guo-qing School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China.

The degradation of formaldehyde gas was studied using UV/TiO2/O3 process under the condition of continuous flow mode. The effects of humidity, initial formaldehyde concentration, residence time and ozone adding amount on degradation of formaldehyde gas were investigated. The experimental results indicated that the combination of ozonation with photocatalytic oxidation on the degradation of formaldehyde showed a synergetic action, e.g,, it could considerably increase decomposing of formaldehyde. The degradation efficiency of formaldehyde was between 73.6% and 79.4% while the initial concentration in the range of 1.84--24 mg/m^3 by O3/TiO2flJV process. The optimal humidity was about 50% in UV/TiO2/O3 processs and degradation of formaldehyde increases from 39.0% to 94.1% when the ozone content increased from 0 to 141 mg/m^3. Furthermore, the kinetics of formaldehyde degradation reaction could be described by Langmuir-Hinshelwood model. The rate constant k of 46.72 mg/（m^***） and Langmuir adsorption coefficient K of 0.0268 m^3/mg were obtained.

关键词： UV/TiO2/O3 process formaldehyde continuous flow mode

Advanced treatment of oil recovery wastewater from polymer flooding by UV/H_2O_2/O_3 and fine filtration

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Journal of Environmental Sciences 2006年第1期18卷 29-32页

作者： REN Guang-meng sun de-zhi Jong Shik CHUNK School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China department of Chemical Engineering Pohang University of Science and Technology Pohang 790-784 Korea

In order to purify oil recovery wastewater from polymer flooding （ORWPF） in tertiary oil recovery in oil fields, advanced treatment of UV/H2O2/O3 and fine filtration were investigated. The experimental results showed that polyacrylamide and oil remaining in ORWPF after the conventional treatment process could be effectively removed by UV/H2O2/O3 process. Fine filtration gave a high performance in eliminating suspended solids. The treated ORWPF can meet the quality requirement of the wastewater-bearing polymer injection in oilfield and be safely re-injected into oil reservoirs for oil recovery.

关键词： oil recovery wastewater from polymer flooding UV/H2O2/O3 process polyacrylamide

Kinetics study on photochemical oxidation of polyacrylamide by ozone combined with hydrogen peroxide and ultraviolet radiation

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Journal of Environmental Sciences 2006年第4期18卷 660-664页

作者： REN Guang-meng sun de-zhi CHUNG Jong Shik School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China department of Chemical Engineering Pohang University of Science and Technology Pohang 790-784 South Korea

An investigation on the process of ozone combined with hydrogen peroxide and ultraviolet radiation has been carried out in order to establish the kinetics for photochemical oxidation of polyacrylamide （PAM） in aqueous solution. Effects of operating parameters, including initial PAM concentration, dosages of ozone and hydrogen peroxide, UV radiation and pH value on the photochemical oxidation of PAM, have been studied. There was an increase in photochemical oxidation rate of PAM with increasing of dosages of 03, H2O2 and ultraviolet radiation. Upon increasing of the initial PAM concentration, the photochemical oxidation rate of PAM decreased. Slight effect of pH value on the photochemical oxidation rate of PAM was observed in the experiments. The kinetics equation for the photochemical oxidation of PAM by the system has been established.

关键词： photochemical oxidation polyacrylamide kinetics ozone/hydrogen peroxide/ultraviolet radiation

Preparation and characterization of Fe_2O_3-CeO_2-TiO_2/γ-Al_2O_3 catalyst for degradation dye wastewater

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Journal of Environmental Sciences 2006年第6期18卷 1189-1192页

作者： LIU Yan sun de-zhi CHENG Lin LI Yan-ping School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

In order to develop a catalyst with high activity for catalytic wet oxidation （CWO） process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation method and the prepared parameters were optimized. The structure of the catalyst was characterized by BET, XRF, SEM and XPS technologies, and the actual wastewater was used to investigate the catalytic activity of Fe2O3-CeO2-TiO2/γ-Al2O3 in CWO process. The experimental results showed that the prepared catalyst exhibited good catalytic activity when the doping amount of Ti was 1.0 wt% （the weight ratio of Ti to carriers）, and the middle product, Fe2O3-CeO2-TiO2/γ-Al2O3, was calcined in 450℃ for 2 h. The CWO experiment for treating actual dye wastewater indicated that the COD, color and TOC of actual wastewater were decreased by 62.23%, 50.12% and 41.26% in 3 h, respectively, and the ratio of BOD5/COD was increased from 0.19 to 0.30.

关键词： catalytic wet oxidation (CWO) Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst dye wastewater treatment

Mechanism study of electrochemical oxidation in the terylene diaphragm cell

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Journal of Environmental Sciences 2006年第1期18卷 33-39页

作者： YU Xiu-juan WANG Hui sun de-zhi SONG Lai-wen WU Lan department of Environmental Science and Engineering Heilongjiang University Harbin 150086 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

By using a self-made carbon/polytetrafluoroethylene （C/PTFE） O2-fed as cathode and Ti/IrO2/RuO2 as anode, the effects of electrochemical oxidation of phenol and the coal-gas wastewater containing phenol were studied. The terylene diaphragm which kept pH〉12 in cathodic compartment and pH〈1 in the anodic compartment was selected in the experiment in comparison with the other types of diaphragm. Furthermore, hydroxyl radical （HO·） was determined in the cathodic compartment of the diaphragm cell by electron spin resonance spectrum（ESR） and the fluorescence spectra. Compared with pH, the accumulated HzO2 and the COD removal of the no-diaphragm cell, the mechanism of electrochemical oxidation in the terylene diaphragm cell was supposed. The degradation of phenol was supposed to be cooperative oxidation by direct or indirect electrochemical oxidation at the anode and H2O2, HO· produced by oxygen reduction at the cathode. The mineralization of phenol in the diaphragm cell was better than that in the no-diaphragm cell. When the coal-gas wastewater was treated by the electrolysis system with terylene diaphragm, the average removal efficiency of the volatile phenol and COD were 100% and 79.6%, respectively.

关键词： electrochemical oxidation C/PTFE O2-fed cathode terylene diaphragm hydroxyl radical

Catalysts for decomposing ozone tail gas

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Journal of Environmental Sciences 2003年第6期15卷 779-782页

作者： LIU Chang-an, sun de-zhi, WANG Hui, LI Wei (department of Environmental Science and Engineering, Harbin Institute of Technology, Harbin 150001,China. department of Environmental Science and Engineering Harbin Institute of Technology Harbin 150001

The preparation of immobilizing-catalysts for decomposing ozone by using dipping method was studied. XRD, XPS and TEM were used to characterize the catalysts. The three kinds of catalysts were selected preferentially, and their catalytic activities were investigated. The results showed that the catalyst with activated carbon dipping acetate(active components are Mn:Cu=3:2, active component proportion in catalyst is 15%, calcination temperature is 200℃) has the best catalytic activity for ozone decomposing. One gram of catalyst can decompose 17.6 g ozone at initial ozone concentration of 2.5 g/m 3 and the residence time in reactor of 0.1 s. The experimental results also indicated that humidity of reaction system had negative effect on catalytic activity.

关键词： ozone tail gas catalytic decomposition immobilizing-catalyst MnO 2 CuO

Ce改性Fe_2O_3/γ-Al_2O_3催化剂的表征及催化活性研究

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功能材料 2006年第6期37卷 915-918页

作者：刘琰孙德智哈尔滨工业大学市政环境工程学院黑龙江哈尔滨150090

采用浸渍焙烧法分别制备了Fe2O3/γ-Al2O3和Ce改性的Fe2O3/-γAl2O3催化剂,采用BET、XRD、XPS和XRF对其结构进行了表征,并用于常温常压CWPO工艺中,考察了Ce的掺杂对Fe2O3/-γAl2O3催化剂催化活性和稳定性的影响。结果表明,Ce的掺杂提高... 详细信息

采用浸渍焙烧法分别制备了Fe2O3/γ-Al2O3和Ce改性的Fe2O3/-γAl2O3催化剂,采用BET、XRD、XPS和XRF对其结构进行了表征,并用于常温常压CWPO工艺中,考察了Ce的掺杂对Fe2O3/-γAl2O3催化剂催化活性和稳定性的影响。结果表明,Ce的掺杂提高了活性组分在载体表面的分散度,在相同的CWPO工艺条件下,Ce的掺杂使得Fe2O3/-γAl2O3催化剂处理偶氮染料废水的催化活性提高了10%左右。

关键词：催化湿式过氧化氢氧化工艺常温常压催化剂偶氮染料废水处理

degradation of Microbes for the Crude Oil Contaminants

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地球科学进展 2004年第S1期19卷 516-519页

作者： LIU Xiao-yan, SHI Peng-fei, sun de-zhi (Science school, Harbin Institute of Technology, Harbin 150001, China)

Production and storage-transportation of crude oil can not only give rise to soil pollution but also destroy ecological environment. degradation of microbes for oily soil was studied with the instnunent, Geofina Hydrocarbon Meter (GHM), by experimental analysis qualitatively and quantitatively in the paper. Analytical result showed that the crude oil could be considerably degraded by eating-oil microbes in oily soil and the number of eating-oil microbes increased while the working hours of oil-well risi...

关键词： Microbes Crude oil Contaminants degradation Experimental analysis

pH值对活性污泥胞外聚合物分子结构和表面特征影响研究

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环境科学 2007年第7期28卷 1507-1511页

作者：郑蕾田禹孙德智哈尔滨工业大学市政环境工程学院

为明确胞外聚合物（extracellular polymeric substances，EPs）对污水污泥性质的影响机制，通过改变pH值，考察了市政废水和饮料废水2种活性污泥胞外聚合物组分变化，采用红外光谱对比分析了pH值对EPS分子结构的影响，并通过胶体滴定... 详细信息

为明确胞外聚合物（extracellular polymeric substances，EPs）对污水污泥性质的影响机制，通过改变pH值，考察了市政废水和饮料废水2种活性污泥胞外聚合物组分变化，采用红外光谱对比分析了pH值对EPS分子结构的影响，并通过胶体滴定测定其表面电荷，最终结合活性污泥提取EPS前后扫描电子显微镜观察，从宏观上佐证了表面特性和分子结构分析．结果表明，强酸条件下（pH3），可提取EPS比中性条件下时下降50％，其中多糖下降约30％，蛋白质下降约65％～70％；在强碱条件下（pH11），可提取EPS比pH7时升高20％～30％，其中多糖升高约15％，蛋白质升高20％～50％．红外光谱分析表明，羟基在强酸强碱条件下均发生了变化，羧酸、多聚糖、酚类和蛋白质肽键在强酸条件下（pH3）消失；胶体滴定结果表明，2种污泥提取EPS表面负电荷随pH上升而下降；扫描电镜分析表明，相对于碱性条件下，酸性条件使活性污泥中微生物细胞更易于破碎．pH值可改变活性污泥EPS组分、浓度以及其中基团组成，从而改变EPS表面特性，最终导致污泥状态改变．

关键词：胞外聚合物污泥 pH值分子结构表面电荷