Naval derusting wastewater containing high concentration of iron, treated in UV photo-Fenton-like oxidation

The UV photooxidation with Fe(III) and H2O2 was employed to treat a naval derusting wastewater, which contains the high COD (chemical oxygen demand) and various metal concentrations exceptionally with high concentrations of citric acid and iron. Because of its iron containment, the Fenton-like reaction automatically took place with the added amount of H2O2. The decomposition rate was found in a sequence of: UV/H2O2/Fe(III) > UV/H2O2 > Fe(II)/H2O2. Two H2O2 injection methods, single and multiple points, were evaluated. The multiple-point H2O2 injection was more e cient to decompose the citric acid. The decomposition of the synthetic citric acid and the real derusting citric acid wastewater was also compared. The 93% COD reduction of the derusting wastewater was achieved using the UV/H2O2/Fe(III) treatment.     

上海市NOx分布状况及其影响因素

以一种简易可靠的大气ＮＯｘ测量方法，大范围地调查了上海市区的ＮＯｘ浓度状况。结果表明，上海市ＮＯｘ浓度分面状况，在不同性质的街区，不同地段，不同道路之间，存在明显差异，居民区大气中ＮＯｘ的浓度可达到国家一级标准要求，但市区各道路网超标严重，平均是一级标准的１．７倍，道路网ＮＯｘ的分布总体呈东南低，北和西北高的梯次。影响城市ＮＯｘ浓度分布的主要因素有：交通、风力、地形、绿化等，在城市建设规划时，应充     

北京地区PM10和PM2.5质量浓度的变化特征

北京市区2003-01-16—04-30PM₁₀和PM2 5的监测结果表明,虽然ρ(PM₁₀),ρ(PM2 5)的变化幅度较大,但是其变化趋势非常相似。PM₁₀,PM2 5质量浓度的日变化呈双峰特征分布。ρ(PM2 5) ρ(PM₁₀)的平均值为56 6%,说明可吸入颗粒物(PM₁₀)中细粒子(PM2 5)的含量大于粗粒子(PM2 5～10)。      

中国生物质废弃物利用现状分析

中国是一个能源资源稀缺的国家,而随着中国经济的发展,我们对能源的需求量越来越大.因此,如何充分有效地利用好中国现有能源资源,显得十分重要.生物质能是一种可再生能源,中国的生物质废弃物资源十分丰富,包括森林能源、农作物秸秆、禽畜粪便、生活垃圾等等,这些废弃物资源若能很好的利用,不但能有效的减少环境污染问题,还将会有助于缓解中国的能源危机.中国的生物质废弃物利用技术起步较晚,但也取得了一些比较突出的科研成果,主要有沼气技术、生物质固化成型技术、生物质气化技术、生物柴油技术等.     

Environmental assessment of laser assisted manufacturing: case studies on laser shock peening and laser assisted turning

Laser assisted manufacturing processes, when compared with traditional manufacturing processes, have the potential to reduce cost, increase surface resistance to wear and fatigue, extend part/tool life, and expand the range of manufacturable materials. These processes have found niche applications in automotive, aerospace, and defense industries. However, very limited research has been conducted to evaluate and compare the environmental performance of laser assisted processes with traditional methods. This paper conducts case studies on two representative laser based processes, i.e. laser shock peening of 7075-T7351 Aluminum and laser assisted turning of compacted graphite iron. Life cycle assessment is used to benchmark the environmental performance of these two processes to conventional processes, i.e. shot peening and turning, respectively. The life cycle inventory of both the laser based processes and conventional processes are developed using SimaPro 7.1 and the Ecoinvent 2.0 database and life cycle impact assessment is performed using US EPA TRACI. The results of this study show that the environmental performance of the two laser based processes is significantly better than conventional processes. For laser shock peening of aluminum, contribution analysis indicates that this is mainly due to the significant extension of fatigue life of the workpiece being treated. For laser assisted turning of compacted graphite iron, the improved performance is mainly due to the extended tool life since cutting tool manufacturing is an energy intensive process. Development of high-power laser with a lower wavelength (e.g. direct diode system) could eliminate the use of paint in laser assisted turning. This, along with improved wall plug efficiency, makes laser assisted turning even more environmentally benign compared to conventional process. A brief cost analysis suggests that both laser shock peening and laser assisted turning can be economically viable with payback period less than three years for niche applications.     

曝气生物滤池处理医院污水的实验应用研究

采用曝气生物滤池与二氧化氯相结合的工艺处理医院污水。主要对曝气生物滤池去除COD、氨氮的效果进行了研究,并且在实际应用中证明了用这种相结合的处理方法具有一次投资小、运行费用低、年经济效益高等优点,有良好的技术经济性。     

布托别山金成矿带构造特征

布托别山金矿带为新疆多拉纳萨依金矿田的西矿带.其构造作用主要经历三期:早期,区域右旋剪切形成一类规模较大的同斜、紧闭、倾竖型褶皱;中期,左旋剪切形成一套由“B”型转换成“A·B”过渡型系列柔性褶皱;晚期,在左旋剪切条件下,产生滑劈理群和微观变形,并叠加于前两期构造之上.构成一条特别醒目的NNW向脆-韧性剪切带。金矿化体严格受这一剪切带控制.     

社会发展与环境资源冲突的典型案例——济南市生活垃圾填埋处置场选址问题研究

用冲突分析理论分析了社会发展与环境资源冲突的典型案例——济南市生活垃圾填埋处置场的选址问题,预测了这一冲突的发展,研究设计了解决这一冲突问题的处理方案．     

中国的环境政策效应与污染治理效果分析

在简述环境政策和管理制度改革的基础上,对基产生的效应进行了分析,主要包括：经济改革促进了环境保护;环境保护新举措初见成效,但污染治理任务仍然十分艰巨。通过对各省区环境治理投资效果分析,提出未来环境政策和治理应该在以下几个方面加强：（１）重新设计环境影响评价和“三同时”制度,将它们与污染物总量控制战略结合起来（２）改善排污收费制度,由超标收费向排污收费转变;由单一浓度收费向浓度与总量相结合转变;由单