污水处理厂絮凝剂最佳浓度的小试实践

聚丙烯酰胺作为絮凝剂在污水处理行业使用已很普遍,使用前通过精确小试更准确把握其使用浓度及使用量,可节约生产成本。本文介绍了一种简易的试验装置,用其测定得到污水处理厂絮凝剂的最佳使用浓度。     

Preliminary report on methane emissions from the Three Gorges Reservoir in the summer drainage period

Considerable variations may exist in CH4 emissions from the Three Gorges Reservoir.     

城市轨道交通多层地下车站公共区排烟方案设计

随着城市轨道交通线网建设的发展,后建线路深埋将会加大,地下车站也将由原来常规的两层变为多层。车站深埋后对人员疏散和排烟系统提出了新的课题。在分析了地铁排烟系统设计与民用建筑的区别的基础上,研究提出了多层车站排烟系统设计及运行模式,包括站台、站厅及中间层的排烟系统方案及运行模式设计,可为同行提供参考。     

从文化角度给烟花爆竹产业定位

2011年3月11日,日本本州东海岸附近海域发生世界有观测史上最大震级9级地震并引发海啸,造成日本多个城市数百万户断电、断水、断燃气、断交通、断通讯,致使城市生命线几乎瘫痪。这场灾难检验了城市抵御大灾的综合能力,他让我们看到了日本防灾减灾体系的完善和日本国民防灾自救的能力。可以说日本用了2万多人的性命和今后数十年恢复建设的成本为全世界的人们做了一次从立法到管理、从政府到公众、从技术装备到应急预案的实战演练。日本之殇,人类之痛。我们必须反思,在当今城市发展追求高度舒适、繁荣的同时我们又为自己留下了什么或是多少自我"毁灭"的隐患。如何规避风险,寻找发展与风险的平衡点,为此本刊邀请各领域专家学者对安全生产在城市运行中的定位;安全生产与公共安全的关系;应急救援在公共安全中的作用进行专题讨论,欢迎大家踊跃参与!     

Removal of humic acid from aqueous solution by cetylpyridinium bromide modified zeolite

Natural zeolite was modified by loading cetylpyridinium bromide (CPB) to create more e cient sites for humic acid (HA) adsorption. The natural and CPB modified zeolites were characterized with X-ray di raction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy and elemental analysis. The e ects of various experimental parameters such as contact time, initial HA concentration, solution pH and coexistent Ca2+, upon HA adsorption onto CPB modified zeolites were evaluated. The results showed that natural zeolite had negligible a nity for HA in aqueous solutions, but CPB modified zeolites exhibited high adsorption e ciency for HA. A higher CPB loading on natural zeolites exhibited a larger HA adsorption capacity. Acidic pH and coexistent Ca2+ were proved to be favorable for HA adsorption onto CPB modified zeolite. The kinetic process was well described by pseudo second-order model. The experimental isotherm data fitted well to Langmuir and Sips models. The maximum monolayer adsorption capacity of CPB modified zeolite with surfactant bilayer coverage was found to be 92.0 mg/g.     

复合氧化物汽车尾气净化催化剂抗SO2中毒机理研究

复合氧化物催化剂(ASC)具有较高的活性和良好的抗SO_2中毒性能.用IR、XPS、TPD等技术研究了该催化剂抗SO_2中毒机理,结果表明,与易失活催化剂相比,ASC经500h反应(反应气含SO_2约20ppm),其活性组分价态无显著变化,仅表面发生SO_2的化学吸附,经与约500ppm的SO_2作用20h后,发现仅有少量SO_4~(2-)形成.这是由于在ASC催化剂中添加了特殊助剂,而使催化剂活性组分得到保护的缘故.     

Identification of priority pharmaceuticals in the water environment of China

In recent years, increasing attention has been paid to the trace-level contamination of pharmaceuticals in the water environment all over the world. Considering a large number of pharmaceuticals used, it is crucial to establish a priority list of pharmaceuticals that should be monitored and/or treated first. In the present study, we developed a ranking system based on the pharmaceutical consumption, removal performance in the wastewater treatment plants (WWTPs) and potential ecological effects, and applied to the situation of China. 39 pharmaceuticals, which had available consumption data and also been reported previously in the WWTPs of China, were selected as candidate pharmaceuticals. Among them, seventeen pharmaceuticals were considered as priority pharmaceuticals, out of which, erythromycin, diclofenac acid and ibuprofen, had the high priority. Compared with other literatures, we found that some pharmaceuticals given concerns to globally should also be included in the priority list in China; while some pharmaceuticals, not mentioned in other literatures, such as cefalexin, ketoconazole, should be also given prior consideration in China. Among all the therapeutic classes, antibiotics, which were grossly abused in China, contributed the most to the priority pharmaceuticals. However, priority antibiotics accounted for only 32% of candidate antibiotics, while 71% and 100% of the candidate anti-inflammatory and antilipidemic respectively were identified as the priority pharmaceuticals, indicating that antibiotics might be overanxiously considered in the previous studies on their behaviors in the WWTPs of China.     

城市污水强化一级处理技术及发展趋势

基于经济与环保的要求，分析了城市污水强化一级处理的适用情况，指出了城市污水强化一级处理的主要工艺方法、特点、处理效果及应用，并提出了城市污水强化一级处理技术的发展趋势。     

西山白家庄矿8煤可排放硫含量的测定

针对西山白家庄矿8煤的实际情况，初步尝试了测定其硫的实际排放状况，探索了温度及添加剂对可排放 硫含量的影响。结果表明该煤的自身固硫率不高； 添加9％的CaO可排放硫含量可以达到城市窑（锅）炉对硫分的要求；同时试验表明MgO对可排放硫影响不大。     

世行贷款项目环境管理

介绍了世行贷款项目各阶段环境管理的具体内容和特殊问题，并提出面临难题。