电改袋技术在CFB锅炉除尘系统改造中的应用

分析了CFB锅炉电除尘系统改造为袋式除尘器的技术方案。改造后,除尘器已经稳定运行半年多,各项技术指标均达到设计要求,环境效益与经济效益显著。     

Increasing trend of primary NO2 exhaust emission fraction in Hong Kong

Despite the successful reduction in roadside NO( x ) levels, no such decrease has been detected in roadside NO(2) concentration in Hong Kong. One underlying cause could be the rising primary NO(2) fraction of the total emission of NO( x ). Primary NO(2) can be particularly detrimental to Hong Kong because a large fraction of the population are exposed to the traffic-related primary pollutants in the street canyons formed by congested high-rise buildings. In this study, hourly mean concentration data for roadside nitrogen oxides (NO( x )), nitrogen dioxide (NO(2)), and background ozone (O(3)) were used to estimate the mean primary NO(2) fraction from vehicle exhausts in Hong Kong. An overall increasing trend was observed for the primary NO(2) fraction (f-NO(2)) values in all the three roadside air monitoring sites. The primary NO(2) as a fraction of total NO( x ) (f-NO(2)) increased approximately from 2% in 1998 to 13% in 2008 in Hong Kong. The two particular periods of rising f-NO(2) coincided with the two implementation periods of the diesel retrofit programs for the light-duty vehicles and heavy-duty vehicles. Future vehicle emission control strategies should target not only total NO( x ) but also primary NO(2). Health benefit or disease burden estimates should be taken into account and updated in the process of policy planning and evaluation.     

Mortality risk attributable to diurnal temperature range: a multicity study in Yunnan of southwest China

Environmental Science and Pollution Research - We aimed to estimate the non-accidental and cause-specific mortality burden attributed to diurnal temperature range (DTR) and the relative...     

Evaluation of leaching characteristic and kinetic study of lithium from lithium aluminum silicate glass-ceramics by NaOH

The behavior and mechanism of Li leaching from lithium aluminum silicate glass-ceramics which can be used as a secondary source of Li using aqueous NaOH solution was investigated. The Li leaching efficiency is increased with increasing concentration of NaOH, specific surface area, and reaction temperature. When leached under optimum conditions, 2 mol/L NaOH, 53 μm particle undersize, 1:10 solid/liquid ratio, 250 r/min stirring speed, 100°C reaction temperature, 12 hr, the Li leaching efficiency was approximately 70%. However, when the leaching experiment was performed for 48 hr, the concentration of Li⁺ ions contained in the leach liquor decreased from 1160 to 236 mg/L. To investigate the origin of this phenomenon, the obtained leach residue was analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. These analyses show that zeolite was formed around the lithium aluminum silicate glass-ceramics, which affected the leaching of by adsorbing Li⁺ ions. In addition, using the shrinking-core model and the Arrhenius equation, the leaching reaction with NaOH was found to depends on the chemical reaction of the two reactants, with a higher than 41.84 kJ/mol of the activation energy.     

Introduction to the special issue on Advances in Life-Cycle Approachesto Business and Resource Management in the Asia-Pacific Region

This special issue of the Journal of Cleaner Production was initiated as a result of the 5th and 6th meetings of the Asia Pacific Roundtable for Sustainable Consumption and Production (APRSCP), which were held in Melbourne, Australia and Hanoi, Vietnam, respectively. A need identified at those meetings was to create another means of communicating the best ideas and papers being presented, to a wider audience. The Asia Pacific region has special development needs given its rapid emergence as a global production hub, but coupled to that are also the rapid social adjustments and shifts in patterns of consumption and production which aren't positive for the environment. This special issue contains eight papers covering the implementation of cleaner production and life cycle principles at the systems and regional planning level. These articles cover urban development, corporate CP programs, supply chain management, eco-industrial networks, and industrial parks, recycling, and understanding the role of human factors in bringing about environmental change.     

海原特大地震诱发滑坡灾害的研究现状

在介绍海原特大地震概况和诱发地震地质灾害的基础上,系统地总结了不同的学者在地震滑坡的发育特点与分布特征、黄土地震滑坡的形成机理、场地条件、黄土边坡动力稳定性和黄土动力学特性等方面的研究成果,评述了这些成果对促进黄土地震滑坡灾害研究的作用和贡献。在此基础上,结合当前我国经济建设发展的需求和理论研究的热点,提出了今后在这一领域需要进一步研究和关注的有关问题和研究方向。     

负压气力输送在干混砂浆生产中的应用

在干混砂浆生产中,负压气力输送用于输送水泥、粉煤灰等粉料,具有设备简单、布置灵活和防止粉尘污染等优点。阐述了负压气力输送的组成及主要部件,并介绍负压气力输送设计流程。以生产中输送粉煤灰为例,进行了负压气力输送设计计算。总结相关优化措施,提出编制可视化软件和运用计算机辅助设计,实现输送参数的优化,有利于降低能耗,提高经济效益。     

金华生态建筑

金华生态建筑 (包括生态厕所 )是指能够进行自身良性循环的绿色建筑物。它有三个特点 ,即地下设有沼气净化池、屋顶覆土种植或养殖和墙体垂直绿化 ,并具有节土、节水、节能和生态、经济、社会三大效益协调统一的两大优点。目前 ,已经在城乡得到初步应用。实践表明 ,政府在生态建筑的推广中发挥着重要作用。同时 ,生态建筑的推广还是一项长期的任务 ,需要坚持不懈地努力 ,不断完善和提高     

离子色谱—电化学检测法测定溴和碘

用离子色谱-电化学检测法同时测定溴和碘。以0.025mol/ L硝酸钠为淋洗液,其酸度为pH6.0.施加电压为+0.2V,对测定溴和碘量为适宜。方法可用于天然水中μg/L级溴和碘的测定。溴和碘的最低检测限各为0.4、1.0μg/L。当溴浓度为3.2μg/L,碘浓度为62μg/L时,变异系数各为3.4％及1.8％。