沼气高值化利用与净化提纯技术

基于户用沼气池以及传统工业沼气锅炉的低附加值沼气利用方式已经不适合沼气产业规模化和商业化的发展方向,在分析我国沼气资源潜力的基础上,重点介绍了沼气制备车用压缩天然气、管道天然气、热电联产等高值化利用方式及相关标准;针对高值化利用方式,分析比较了现有的高压水洗、物理吸收、化学吸收、变压吸附、膜分离和深冷分离等几种沼气净化提纯工艺的技术及应用情况,介绍了高效沼气脱硫技术,并指出氧、氮含量源头控制的重要性。     

地铁停车场上盖物业开发声环境影响评价研究

占地面积大、交通便利的地铁停车场上盖物业开发越来越受到青睐。以南京市江宁大学城停车场上盖物业为例,对受到地铁停车场、高架地铁和公路3方面噪声源影响的上盖物业进行了声环境影响预测分析。得出:该项目受到停车场噪声影响的最大声级达61.9dB(A),受到高架地铁噪声和公路噪声叠加影响的等效声级昼间可达67.7dB(A),夜间可达63.6dB(A)。在确保落实相应防护措施的前提下,地铁停车场上盖物业在声环境上总体上具有可行性。     

环境空气自动监测质量管理探讨

以云南省城市空气自动监测站质控考核为依据,对考核中发现的问题进行了详细分析,探讨如何做好空气自动监测质量管理。     

绿色文化与绿色生产力

绿色生产力是以＂绿色＂为核心价值的生产力。绿色文化是以生态科学和可持续发展理论作为思想基础的新兴文化,是倡导人与自然和谐相处的思想体系。绿色文化是发展绿色生产力的价值选择。绿色文化以科学技术为载体,发挥生产力功能。绿色文化作为价值观,指导管理、法律法规等,共同实现生产力绿色水平的提高。     

大型社会活动的事故预防与控制

大型社会活动的安全形势非常严峻,本文通过对大型社会活动安全管理中存在的问题和事故影响因素的分析,从事故预防和控制的角度提出几点措施.     

串联毛细管柱气相色谱分析石脑油中微量甲基叔丁基醚

应用Agilent 6890 plus 气相色谱仪(配有FID),把一根50 m×0.25 mm×0.5 μm PEG-20M毛细管色谱柱和一根100 m×0.25 mm×0.5 μm HP-1毛细管色谱柱串接,使得甲基叔丁基醚(MTBE)能和石脑油中其它组分完全分离,解决了石脑油中微量MTBE的测定难题.方法的标准偏差是0.20%,回收率为100%.     

吸附法油气回收装置中真空泵的安装与调试

简要介绍了济南分公司油气回收装置、真空泵的工作原理以及安装与调试应注意的问题.     

生活垃圾填埋场甲烷自然减排的新途径:厌氧与好氧的共氧化作用

采用暴雨过后垃圾填埋表层30～60 cm的覆土、表层1.5 m以下的垃圾,以及刚刚开挖出来的9年矿化垃圾进行硫酸盐还原菌阳性反应试验,结果表明生活垃圾填埋体不同填埋层都存在不同数量级的硫酸盐还原菌,且底层矿化垃圾中的硫酸盐还原菌的数量最多,表层覆土中最少.颗粒大小比例为50%:50%的垃圾样品表现出最佳的甲烷好氧与厌氧...     

220kV变压器噪声及其传播特性浅析

变压器噪声呈中低频特性,距离衰减率低,传播影响范围大。通过对上海某220kV露天变电站变压器噪声的实测数据进行简要分析,论述了220kV变压器噪声的强度及其频率特性,并探讨了变压器噪声在不同距离范围内的传播衰减特性。     

Transport and fate of mercury under different hydrologic regimes in polluted stream in mining area

Seepage from Hg mine wastes and calcines contains high concentrations of mercury (Hg). Hg pollution is a major environmental problem in areas with abandoned mercury mines and retorting units. This study evaluates factors, especially the hydrological and sedimentary variables, governing temporal and spatial variation in levels and state of mercury in streams impacted by Hg contaminated runo . Samples were taken during di erent flow regimes in theWanshan Hg mining area in Guizhou Province, China. In its headwaters the sampled streams/rivers pass by several mine wastes and calcines with high concentration of Hg. Seepage causes serious Hg contamination to the downstream area. Concentrations of Hg in water samples showed significant seasonal variations. Periods of higher flow showed high concentrations of total Hg (THg) in water due to more particles being re-suspended and transported. The concentrations of major anions (e.g., Cl??, F??, NO3?? and SO4 2??) were lower during higher flow due to dilution. Due to both sedimentation of particles and dilution from tributaries the concentration of THg decreased from 2100 ng/L to background levels (< 50 ng/L) within 10 km distance downstream. Sedimentation is the main reason for the fast decrease of the concentration, it accounts for 69% and 60% for higher flow and lower flow regimes respectively in the upper part of the stream. Speciation calculation of the dissolved Hg fraction (DHg) (using Visual MINTEQ) showed that Hg(OH)2 associated with dissolved organic matter is the main form of Hg in dissolved phase in surface waters in Wanshan (over 95%).