Shifted power-law relationship between NO2 concentration and the distance from a highway: A new dispersion model based on the wind profile model

In this paper, a shifted power-law model, based on the wind profile model, had been supposed to simulate concentration gradient of nitrogen dioxide (NO₂) with distance from a highway. Field experiments were performed for NO₂ gradients from a highway in Shanghai by using passive samplers. The shifted power-law model was fitted well with experimental results of field experiments both in this study and in the literature. The results not only verified the validity of shifted power-law relationship between NO₂ concentration and the distance from a highway, but also partially demonstrated that there were some significant similarities between wind profile and air pollutants concentration profile near highway. With known concentration of chosen reference point and appropriate value of the parameter k, the model could be practically applied for predicting the NO₂ distributions near a highway. The methods of determining the parameter k were also discussed for further detailed studies.     

高效堆肥菌种的筛选及在城市污泥堆肥上的应用

分离筛选出了4株猪粪堆肥菌种,初步的分类鉴定表明它们均属于芽孢杆菌属.利用这些菌种制成混合菌剂,并进行城市污泥堆肥对比试验,结果显示,接菌处理在各项堆肥指标上明显优于未接菌的空白处理,自制菌与酵素菌在堆肥过程中具有非常相似的发酵能力,均能加快堆肥的升温速度,提高堆肥的最高温度,加快物料含水率的下降.说明自制菌不但可以应用于猪粪的堆肥发酵,在城市污泥高温堆肥方面也有很好的应用潜力.     

活性炭颗粒填充三维电极电化学烟气脱硫的研究

基于三维电极电化学技术较高的反应效率和不产生废弃物等优点,将这一先进的反应器运用到烟气脱硫领域.用活性炭作为工作电极,在通电状况下,将模拟烟气通入反应器发生反应.通过一系列试验,分析了填充床厚度、槽电压、进气流量、通电时间对脱硫率的影响,并且探讨了该反应的反应原理.     

Performance of bioferric-submerged membrane bioreactor for dyeing wastewater treatment

Adding iron salt or iron hydroxide to sludgemixed liquor in an aeration tank of a conventional activated sludge processes (bioferric process) can simultaneously improve the sludge’s filterability and enhance the system’s treatment capacity. In view of this, Fe(OH)₃ was added to a submerged membrane bioreactor (SMBR) to enhance the removal efficiency and to mitigate membrane fouling. Bioferric process and SMBR were combined to create a novel process called Bioferric-SMBR. A side-by-side comparison study of Bioferric-SMBR and common SMBR dealing with dyeing wastewater was carried out. Bioferric-SMBR showed potential superiority, which could enhance removal efficiency, reduce membrane fouling and improve sludge characteristic. When volumetric loading rate was 25% higher than that of common SMBR, the removal efficiencies of Bioferric-SMBR on COD, dye, and NH₄ ⁺-N were 1.0%, 9.5%, and 5.2% higher than that of common SMBR, respectively. The trans-membrane pressure of Bioferric-SMBR was only 36% of that in common SMBR while its membrane flux was 25% higher than that of common SMBR. The stable running period in Bioferric-SMBR was 2.5 times of that in common SMBR when there was no surplus sludge discharged. The mixed liquor suspended solids concentration of Bioferric-SMBR was higher than that of common SMBR with more diversified kinds of microorganisms such as protozoans and metazoans. The mean particle diameter and specific oxygen uptake rate of Bioferric-SMBR were 3.10 and 1.23 times the common SMBR, respectively.     

新世纪的清洁能源--燃料电池

介绍了一种高效，环境良好的发电方式-燃料电池发电技术，阐述了燃料电池的发电原理及其开发现状，对其发展前景作了展望。     

Restructuring water industry in China: towards sustainable urbanization

１　ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｄｕｓｔｒｉａｌｉｚａｔｉｏｎａｎｄｕｒｂａｎｉｚａｔｉｏｎａｒｅｔｗｏｍａｉｎａｓｐｅｃｔｓｏｆｅｃｏｎｏｍｉｃｄｅｖｅｌｏｐｍｅｎｔ．Ｃｈｉｎａｈａｓｂｅｅｎｕｎｄｅｒｇｏｉｎｇｔｈｅｓｅｃｏｕｒｓｅｓ．ＩｎｔｈｅｐｒｏｃｅｓｓｏｆＣｈｉｎｅｓｅｕｒｂａｎｉｚａｔｉｏｎ，ｔｈｅｐｒｏｐｏｒｔｉｏｎｏｆｕｒｂａｎｐｏｐｕｌａｔｉｏｎｉｎｔｏｔａｌｐｏｐｕｌａｔｉｏｎｉｎｃｒｅａｓｅｓｆｒｏｍ２５－８１％ｉｎ１９８８ｔｏ２９－９２％ｉｎ１９９７（ＳＳＢ，１９９０；…     

与赵忠祥的绿色对话

我是中央电视台这棵大树上的一片叶子，我为这个机体输送过经光合作用而形成的养分，也受这棵大树的支撑能在阳光下闪烁。尽管任何一片叶子都迟早会脱落，但是，这棵大树注定根深叶茂，日益繁盛。没有中央电视台就没有我。     

丝状菌污泥膨胀的微生物学理论与控制对策

在活性污泥系统中，由丝状菌过度繁殖引起的污泥膨胀是最难解决的问题之一。文章对与丝状菌污泥膨胀相关的微生物学和丝状菌生理生态学进行了讨论；介绍了现有的解释污泥膨胀的基本理论，并对丝状菌膨胀的控制措施进行了探讨。     

美国自然保护选民联合会

自然保护选民联合会（LCV）是美国一家旨在反映全国环保运动，并略带有政治观点的非政府组织，也是美国唯一一个竭力促使国会和白宫成为对环境负责任的国家权利机构的无党派和非营利组织。因而，也被称之为环境政治压力团体。     

受内压厚壁圆筒的弹塑性有限元分析及其在焊管管端定径工艺中的应用

此文用自行编制的弹塑性有限元程序对承受内压的厚壁圆筒进行了分析,考虑了材料的应变强化,分析了小变形情况下达到塑性极限点以后内压与径向位移之间的关系。并将其应用于焊管管端定径工艺分析中,得出了主要工艺参数。