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991.
东深源水生物预处理工程挂膜启动过程水质净化效果变化的分析 总被引:5,自引:0,他引:5
东深源水生物预处理工程挂膜启动约需 2 5d ,比优化试验增加 10d左右 ,本文介绍了挂膜启动过程氨氮、CODMn去除效果和填料上生物膜变化的特点。由氨氮去除率 (≥ 5 0 .0 % )、生物膜形状、生物膜上动物种类和数量可判断挂膜启动过程是否完成 ,气温低是该工程挂膜启动过程时间较长的主要原因 相似文献
992.
Enhancement of photocatalytic oxidation of humic acid in TiO2 suspensions by increasing cation strength 总被引:6,自引:0,他引:6
This study aimed at improving the photocatalytic (PC) oxidation of humic acids (HA) in TiO2 suspensions by adding cationic ion such as calcium or magnesium. A set of tests was first conducted in the dark to study the adsorption of HA onto TiO2 in suspensions at different pH and calcium concentrations. The experiment demonstrated that the adsorption of HA onto the TiO2 particles was either pH-dependent or calcium strength-dependent due to electrostatic interaction and calcium ion bridging. The photodegradation of HA in the presence of UV irradiation was investigated as a function of pH and the concentration of calcium and magnesium ions. The results showed that the adsorption behavior between HA and TiO2 played a very important role during the PC oxidation process. The PC oxidation could be enhanced at neutral pH by increasing the cation strength. The kinetics of HA PC degradation in TiO2 suspensions with different initial concentrations was also studied using the Langmuir-Hinshelwood model. 相似文献
993.
994.
镉对鲫鱼组织转氨酶和过氧化氢酶活性的影响 总被引:23,自引:0,他引:23
当水中镉离子浓度为32mg/L,64mg/L时,肝胰脏,肾脏和鳃的谷丙转氨酶和谷草转氨酶活性显著降低,而过氧化氢酶活性则显著升高,对鲫鱼心脏3种酶活性的影响不明显,体外试验表明,镉能直接抑制GPT、GOT的活性,而对Catalase活性不产生直接影响。 相似文献
995.
996.
我国是人口大国 ,随着人民生活水平的不断提高 ,现有的垃圾处理技术已逐渐不能适应产量日益增长与成分不断复杂化的垃圾处理的需要 ,垃圾处理急需一场革命性的变化 ,必须摆脱现有城市垃圾处理三大方法面临的技术上难以避免的弊端和“阴影”。也就是说 ,垃圾处理应该从垃圾分选设备技术整体创新入手 ,引入一整套的垃圾机械处理联合装置及各种新型的联合处理方法 ,使垃圾处理成本大大降低 ,从而产生一次历史转折性的突破 ,带动和实现垃圾处理的产业化。为了达到这一目标 ,对垃圾处理需要重点解决的技术难关进行了探讨与展望 相似文献
997.
城市室内环境多环芳烃污染与源的相关性 总被引:5,自引:0,他引:5
本实验选择了天津市4类典型室内环境和2处室外对照点,共19个采样点。现场采样测定了10种PAHs组成含量。结果显示,室内燃煤和室内吸烟是室内环境中多环芳烃排放的主要污染源。同作为对照的室外大气中多环芳烃组成和含量进行了对比,研究了室内环境不同污染源排放多环芳烃组成和含量的特征性。提出了室内燃煤污染同燃煤型室外大气源排放多环芳烃具有相似组成含量特征,而室内烟草烟雾污染源的多环芳烃组成含量特征则与室外 相似文献
998.
John?YangEmail author Jianguo?Sun David?Hammer Robert?Blanchar 《Environmental Chemistry Letters》2004,2(3):159-162
Soil pH, a log-transformed form of hydrogen ion (H+) activity, is often used for various statistics. However whether soil pH meets the requirement of distribution normality for statistical analyses is unknown. We studied the statistical suitability of both soil pH and H+ activity by examining their distribution normalities. Results show that the variability of H+ activity is higher and its distribution is skewer, which is significantly different from the normal and soil pH, regardless of soil conditions and analytical methods. Here we demonstrate that soil pH is more appropriate than the H+ activity for performing statistical analysis in terms of distribution normality. 相似文献
999.
Effects of Population Size, Mating System, and Evolutionary Origin on Genetic Diversity in Spiranthes sinensis and S. hongkongensis 总被引:5,自引:0,他引:5
Mei Sun 《Conservation biology》1996,10(3):785-795
Hong Kong once supported more than 109 species of wild orchids, of which approximately 30% were endemic. Most of the local wild orchids have now become rare or endangered. I conducted a comparative study of genetic diversity in two closely related terrestrial orchids, an allotetraploid, Spiranthes hongkongensis , and its diploid progenitor, S. sinensis , to assess the effects of the population bottleneck associated with the origin of the polyploid and to investigate the relationships between number of breeding individuals, mating system, and level of isozyme variation in their populations. Nearly complete genetic uniformity was observed both within and among populations of S. hongkongensis . In contrast, S. sinensis had high levels of genetic variation for all of the genetic parameters examined. Regression analysis of population size and several components of genetic diversity in S. sinensis revealed that, among various measures of within-population variation, the proportion of polymorphic loci ( P ) and average number of alleles per locus ( A ) or per polymorphic locus ( A p ) were the most sensitive to population size ( R 2 = 0.942, p = 0.001; R 2 = 0.932, p = 0.002; and R 2 = 0.923, p = 0.002 respectively). The highly negative correlation ( r = −0.999, p < 0.01) between population size and the mean frequency of private alleles in pairwise population comparisons, p (1), indicated that population size may also be used to predict the extent of population differentiation caused by random genetic drift. Conservation of genetic diversity in S. sinensis could be maximized by protecting several of both large and small populations, whereas fewer populations may be needed to achieve this goal for S. hongkongensis. 相似文献
1000.
Min Sun Risheng Yao Yahua You Shengsong Deng Wenxia Gao 《Frontiers of Environmental Science & Engineering》2007,1(1):95-98
This paper reports on the degradation of 4-aminophenol using hydrogen peroxide as oxidizer and the enzyme from Serratia marcescens AB 90027 as catalyst. The effecting factors during degradation and the degrading mechanism were studied. Also, the location of the enzyme in the cell, which could catalyze the degradation of 4-aminophenol, was analyzed. The results showed that to degrade 50 mL of 4-aminophenol whose concentration was 500 mg/L, the optimal conditions were: volume of H2O2 = 3 mL, temperature = 40–60°C and pH = 9–10. In the degradation process, 4-aminophenol was first converted to benzoquinone and NH3, then organic acids including maleic acid, fumaleic acid, and oxalic acid were formed, and then finally CO2 and H2O were generated as final products. The enzyme that could catalyze the degradation of 4-aminophenol was mainly extracellular enzyme. 相似文献