Promotive effect of pyridine on indole degradation by activated sludge under anoxic conditions

Batch experiments were carried out to investigate the promotive effect of pyridine on indole degradation under denitrifying conditions. The seed sludge was obtained from a local coal-coking wastewater treatment facility and was acclimated in the laboratory. Indole and pyridine were supplemented to the synthetic wastewater at different ratios. The optimum ratio of chemical oxygen demand (COD) to nitrate (C/N) was 8.4–8.9 for both denitrification and indole and pyridine degradation. At a temperature of 28°C and pH of 7.0–7.5, the nitrate reductase activity (NRA) was in the best state. The addition of pyridine could promote NRA and the degradation of indole. When the initial concentration of indole was 150 mg/L, the concentration ratio of indole to pyridine was in the range of 1–10. Under optimum C/N conditions, the degradation of indole could be described with pseudo-zero-order kinetics. There was no accumulation of nitrite during the reaction. When the concentration ratio of pyridine to indole was less than 0.25 with an increase in the pyridine proportion, there were more significant augment rates for NRA and the degradation of indole than the situation when the concentration ratio was more than 0.25. __________ Translated from Environmental Science, 2006, 27(2): 300–304 [译自: 环境科学]     

含柠檬酸盐电镀废水的处理

对含柠檬酸盐电镀废水的几种处理方法的比较表明,氯化钡添加法能较好地使柠檬酸盐沉淀,操作简便,处理效果理想,其柠檬酸根离子的去除率达98％以上。     

我国电子废弃物收集体系构想

解决中国电子废弃物问题,一是控制电子废弃物进入非正式循环利用者手中;二是把非正式循环利用系统纳入良好的电子废弃物管理系统,使之成为更有效和对环境友好的系统.因此,如何把千家万户废弃的电子废弃物有效收集起来,是关系到电子废弃物管理和循环利用的重要环节.在我国建立良好的电子废弃物收集体系,应以市场经济和目前我国“城乡二元经济“为基础,建立具有收集主体多元化、收集方式多样化,收集途径多渠道等特点的电子废弃物收集体系.     

滇池细菌总数与有机碳、氮、磷的调查研究

通过对滇池水体一年多的定点采样工作,重点调查研究了草海、外海表层水中细菌数量及有机营养盐碳、氮、磷的季节变化规律,分析探讨了细菌总数与环境条件和有机营养盐之间的某些关系.对滇池富营养治理提出了一些建议,并提出利用微生物学的方法参与这一研究.     

水蚀风蚀交错带小流域生态环境综合治理模式研究

水蚀风蚀交错带是黄土高原侵蚀最严重的地区和黄河下游河床粗泥沙的主要来源区，其生态环境脆弱、治理难度大，加之晋陕蒙能源基地的大规模开发，也带来了新的环境问题。鉴于治黄和煤田开发及生态环境整治的紧迫需要，以水蚀风蚀交错带六道沟小流域为试区，分析研究了该区水蚀风蚀时空分布规律及脆弱生态环境特征，提出以防治水蚀和风蚀为中心，以提高生态经济效益和持续发展为目标，以基本农田优化结构和高效利用及植被建设为重点，建立具有防蚀固沙兼高效生态经济功能的大农业复合生态系统综合治理模式，取得了良好的社会与经济效益。     

无盘网络系统的介绍和应用

无盘网络系统是一种很适合在计算机配置较固定、软件程序较划一的网络环境中运行的网络系统,随着电脑教育的规模扩大,网络教室的普及,发展也非常快.本文简述了其产生环境、功能介绍,针对其优势和不足说明了无盘网络系统的应用前景是非常广阔的.     

膨润土吸附－絮凝法处理污水中的重金属离子

研究了天然膨润土对Ｐｂ￣（２＋）、Ｃｄ￣（２＋）、Ｃｒ￣（３＋）的吸附和膨润土的絮凝沉降条件，将吸附与絮凝过程结合起来形成处理污水的新工艺，加入０．０４％膨润土和０．００６％的ＰＡＣ可使低浓度污水中Ｐｂ￣（２＋）脱除９３．１％。     

松花江氯苯类有机污染物的水质标准制定

松花江具有冰封期较长,江水中有机毒物难降解、迁移距离长等环境特点.为了控制污染、保护生态环境、维护生态安全、结合松花江特点,研究并制定了松花江氯苯类有机污染物水质标准.本标准已列为地方标准(GB23/T901-2005).     

大顶子山航电枢纽工程建库后上游水质总量控制研究

松花江大顶子山枢纽工程建设后,库区内水体流线及扩散规律的变化将影响库区内水质,受沿江排污影响,其规划目标的水环境容量将发生改变,因此对建库后上游水质总量控制进行研究很有意义.     

Mechanics Principle and Engineering Application of Split Layer and Bed Separation of Mining Overburden

<正>To control land surface subsidence caused the underground mineral exploitation and the catastrophic phenomena such as serious damage of buildings, waterbodies, cultivated lands, railways, bridges caused by land subsidence, bed separation grouting technology of overburden is put forward. To provide theoretical support for the technology, the characteristics and the mechanics mechanism of mining overburden from layer-split to formation of bed separation are studied. On the basis of elastic sheet board theory, calculation formula of rock sheet deflection is presented, and the mechanics criteria of the separation formation and the calculation formula of bed separation volume are set up. Finally, the applications and technics of bed separation grout technology of mining overburden to control land subsidence in china are introduced.