天氧附着膜膨胀床反应器预处理有机氯农药废水的研究

针对有机氯农药废水可生化性差的特点，研究了采用厌氧膨胀床颗粒活性炭反应器对其预处理以提高可生化性的效果。未经处理的有机氯农药废水及经混凝、Fenton氧化处理后的有机氯农药废水分别进入厌氧反应器，在进水pH为6．8～7．2，水力停留时间为48h，有机物容积负荷为1．41～3．19kgCOD／m^2．d时，3种废水的出水B／C值分别为0．35、0．41和0．42；出水COD分别为1280、1050和659mg／L；出水色度分别为50倍（灰白）、20倍（灰白）和20倍（灰白）。从运行稳定、经济的角度，选择混凝一厌氧组合作为该农药废水的预处理工艺。研究提出采用单位表面面积生物膜底物降解速率LW作为厌氧膨胀床反应器的设计指标，并根据试验数据得出厌氧膨胀床颗粒活性炭反应器的动力学模型，为工程设计及运行管理提供依据。     

城市水源地突发性水污染事件研究述评

日益恶化的突发性水污染事件始终是国内外大多数城市水源地安全和城市供水安全的重要威胁。从城市水源地突发性污染事件的风险源、水源地易损性、应急评估和预警技术及应急机制4个方面综述了国内外城市水源地突发性污染事件的研究进展。述评认为，应关注城市水源地的特殊易损性及突发性污染的威胁，重点研究水源地突发性污染事件的快速评估和预警技术及应急机制，全面开展城市水源地突发性污染事件的基础和实例研究。     

壳聚糖在固定化光合细菌处理染料活性艳红X-3B中的应用研究

采用海藻酸钠对光合细菌进行包埋,并在固定化过程中加入壳聚糖,研究添加了壳聚糖的固定化细胞在不同条件下对活性艳红X-3B的脱色效果及其降解动力学.实验结果表明,在厌氧条件下,X-3B的脱色效果较好;染料浓度在30～300 mg/L之间变化时,厌氧降解动力学方程均符合一级动力学方程;降解速率与染料初始浓度之间关系符合Michaelis-Menten方程,反应动力学参数Km=374.96 mg/L,Vmax=7.53 mg/L·h.振荡有利于脱色并使半衰期缩短;固定化小球可重复使用.     

Comparative studies of the Fe3+/2+-UV, H2O2-UV, TiO2-UV/vis systems for the decolorization of a textile dye X-3B in water

The degradation of a common textile dye, Reactive-brilliant red X-3B, by several advanced oxidation technologies was studied in an air-saturated aqueous solution. The dye was resistant to the UV illumination (wavelength λ  320 nm), but was decolorized when one of Fe³⁺, H₂O₂ and TiO₂ components was present. The decolorization rate was observed to be quite different for each system, and the relative order evaluated under comparable conditions followed the order of Fe²⁺–H₂O₂–UV  Fe²⁺–H₂O₂ > Fe³⁺–H₂O₂–UV > Fe³⁺–H₂O₂ > Fe³⁺–TiO₂–UV > TiO₂–UV > Fe³⁺–UV > TiO₂–visible light (λ  450 nm) > H₂O₂–UV > Fe²⁺–UV. The mechanism for each process is discussed, and linked together for understanding the observed differences in reactivity.     

Sensitivity analyses of woody species exposed to air pollution based on ecophysiological measurements

GOAL, SCOPE AND BACKGROUND: Air pollution has been of a major problem in the Pearl River Delta of south China, particularly during the last two decades. Emissions of air pollutants from industries have already led to damages in natural communities and environments in a wide range of the Delta area. Leaf parameters such as chlorophyll fluorescence, leaf area (LA), dry weight (DW) and leaf mass per area (LMA) had once been used as specific indexes of environmental stress. This study aims to determine in situ if the daily variation of chlorophyll fluorescence and other ecophysiological parameters in five seedlings of three woody species, Ilex rotunda, Ficus microcarpa and Machilus chinensis, could be used alone or in combination with other measurements for sensitivity indexes to make diagnoses under air pollution stress and, hence, to choose the correct tree species for urban afforestation in the Delta area. METHODS: Five seedlings of each species were transplanted in pot containers after their acclimation under shadowing conditions. Chlorophyll fluorescence measurements were made in situ by a portable fluorometer (OS-30, Opti-sciences, U.S.A). Ten random samples of leaves were picked from each species for LA measurements by area-meter (CI-203, CID, Inc., U.S.A). DW was determined after the leaf samples were dried to a constant weight at 65 degrees C. LMA was calculated as the ratio of DW/LA. Leaf N content was analyzed according to the Kjeldhal method, and the extraction of pigments was carried out according Lin et al. RESULTS AND DISCUSSION: The daily mean Fv/Fm (Fv is the variable fluorescence and Fm is the maximum fluorescence) analysis showed that Ilex rotunda and Ficus microcarpa were more highly resistant to pollution stress, followed by Machilus chinensis, implying that the efficiency of photosystem II in I. rotunda was less affected by air pollutants than the other two species. Little difference in daily change of Fv/Fm in I. rotunda between the polluted and the clean site was also observed. However, a relatively large variation of Fv/Fm appeared in the other two species, particularly in M. chinensis, suggesting that they were more sensitive to air pollutants than I. rotunda. The mean LA was reduced for all species growing at the polluted site. The mean LMA for all species exceeded the sclerophylly threshold given by Cowling and Campbell and increased for those under pollution stress, which could be explained as one of the acclimation strategies for plants to air pollution stress. Little difference in leaf chlorophyll content was observed in F. microcarpa and M. chinensis, while remarkable differences were found in I. rotunda growing at the polluted and the clean site. Content of leaf carotenoids was largely reduced in I. rotunda growing at the polluted site, but increased in F. microcarpa and M. chinensis, compared with plants growing at the clean site. Plants growing at the clean site had a lower leaf N content than those growing at the polluted site. In addition, species with a higher resistance to pollution stress showed less difference in leaf N content than those sensitive species. CONCLUSION: Based on Fv/Fm measurements of the three woody species, I. rotunda showed the highest resistance to air pollutants from ceramic industries, followed by F. microcarpa. M. chinensis was the most sensitive species to air pollution, had lowest capacities to cope with the air pollution stress, which was consistent with visual injury symptoms observed in the crown profiles of plants at the polluted site. Fv/Fm, LAM, LA, leaf pigments and N content could be used alone or in combination to diagnose the extent of the physiological injury. The ratio of Fv/Fm, however, was the best and most effective parameter. RECOMMENDATION AND OUTLOOK: Tree species which have higher air-pollutant resistance, as diagnosed by such ecophysiological parameters, should be considered first and planted widely for urban afforestation or forest regeneration in areas where the forest was seriously degraded or forest health was markedly effected by the same kind of air pollutants.     

西安地区旅游景点水体卫生细菌学调查及保护对策

以粪大肠菌和异养细菌总数做指标，对西安地区旅游景点水体的卫生细菌学状况进行了调查。结果表明，西安市区内旅游景点的人工湖、天然湖等大都受到不同程度的污染，而离市区较远、海拔较高的旅游景点则污染较轻。     

交通污染区城市绿化植物硫含量分布

为探讨城市绿化植物对交通环境中SO2的响应，以远离城市道路的相对清洁区公园生长的植物为对照植物，采集了广东省被广泛栽种的18种园林绿化植物的不同方位的叶片和树皮样品，用硫酸钡比浊法测定了每种植物样品在交通污染区面向机动车行驶方向、面向人行道方向及相对清洁区的植物样品等不同方位的植物叶片和树皮硫含量，分析了绿化植物在同一株植物的不同生长部位和不同环境中硫含量的分布特征。结果表明，交通污染区所有样品的叶片硫和树皮硫含量均高于相对清洁区的样品。其中，远离工厂的交通污染区生长的同一株植物，离机动车道越近，硫含量越高；靠近工厂的交通污染区的同一植物，离工厂近的部位的植物树皮硫含量高于面向机动车道一侧的植物硫含量。     

南方丘陵区土壤潜育化的发生与生态环境建设

依据近年来潜育化土壤的研究资料,分别就南方丘陵区土壤潜育化的主要影响因素,潜育化土壤主要类型及诊断指标,生态环境建设等进行了综合讨论。     

沿海框围养鱼生态系统能量转换效率的分析

分析了沿海滩地３种框围养鱼方式（即精料、种草、化肥养鱼）的能量转换效率及种草养鱼的经济效益。初步得出：在沿海滩地低投入框围养鱼中应重视对太阳能的利用；种草养鱼在３种养鱼方式中能量转换效率最高，经济效益较佳，应推广种草养鱼技术，提高资源利用率。