Distribution and elimination of polycyclic musks in three sewage treatment plants of Beijing, China

The two representative polycyclic musks, 1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthenyl)-ethanone (AHTN) and 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-benzopyrane (HHCB), were measured in aqueous samples and sludge samples of three sewage treatment plants (STPs) in Beijing, China using a gas chromatograph-mass spectrometry. The HHCB and AHTN concentration ranges in the influents were 1251.4-3003.8 ng/L and 111.9-286.3 ng/L, respectively. Meanwhile, the ranges of 492.8-1285.3 ng/...     

废旧电子电器回收路在何方——北京废旧电器电子产品回收处理之建议

由于历史原因,我国在生产电器电子产品时并没有考虑到要对如此庞大的电子垃圾实现无害化处理,更没有预先安排巨额处置资金,这个问题已成为我国电器电子环境标志产品发展的严重制约。同时这些电子垃圾的手工原始拆解、焚烧、填埋,给我国环境造成了严重的危害。     

走向产业化的循环流化床垃圾焚烧发电技术——访北京中科通用能源环保有限责任公司总经理金坚

循环流化床燃烧技术,是一项从上个世纪80年代开始发展起来的应用于环保、能源领域的“环保清洁燃烧技术”。“在燃煤领域,循环流化床是国家洁净煤燃烧的一部分,其特点之一是可以实现炉内脱硫,脱硫率可达80％以上,且成本低,二是燃烧温度在900℃左右,在燃烧学上属于低温燃烧,既可以烧掉烟尘中的有害物质,又可以防止氧化氮（也是温室气体的一种）的生成。”在任北京中科通用能源环保有限责任公司总经理之前,金坚一直在中国科学院工程热物理所从事各类能源装置和循环流化床的研究开发和新技术推广工作,     

今天的技术 明天的绿色——访西门子家电（中国）北京区域总经理王伟庆

金融危机来袭,一家老牌的跨国家电企业会如何应对？西门子的回答是——危机是短时的,它终将过去。西门子这个品牌做了160多年,见过无数次的经济危机,只要你坚持在自己的产品技术研发、生产等环节上往前走,最终会得到回报的。     

北京市2019年工程机械排放污染测算

为了建立北京市工程机械排放清单,测算北京市工程机械气体污染物排放,在获得北京市工程机械保有量、功率分布、排放阶段分布和使用强度等数据之后,通过对不同机械类别、不同排放阶段的工程机械进行PEMS排放试验获得机械排放因子,最终依据《非道路移动源大气污染物排放清单编制技术指南》中的方法,测算北京市2019年工程机械排放总量.结果显示:NOx排放因子整体呈现下降趋势,相比国I排放阶段,国Ⅱ、国Ⅲ、京Ⅳ阶段挖掘机排放因子削减比例分别为51％、65％、74％;叉车削减比例分别为29％、54％、62％;装载机削减比例分别为29％、60％、79％.CO排放因子削减比例没有显示出持续下降或上升趋势.相比国I排放阶段,国Ⅱ、国Ⅲ、京Ⅳ阶段挖掘机排放因子削减比例分别为18％、28％、21％;叉车削减比例分别为8％、12％、31％;装载机削减比例分别为52％、29％、73％.2019年北京市非道路工程机械NOx、CO、CO2的排放量分别是6 222 t、1 635 t、56.7万t.按机械类别划分,挖掘机、装载机、叉车对污染排放量贡献最大,此三种机械污染物之和在NOx、CO、CO2排放总量中占比分别达到94.7％、93.8％、95.4％.     

北京昌平依法查封15处隐患出租房

为了深刻汲取"2.16"山东禹城蛋糕房亡人火灾教训,按照《消防安全专项整治三年行动实施方案》部署要求,昌平区消防救援支队近日集中对区级挂账隐患村开展消防安全调研,重点对沿街商铺用火、用电、用气情况以及是否存在三合一等情况开展消防安全检查。     

安全化春雨 润物细无声——北京金隅集团安全文化建设新尝试

很多人对北京金隅集团的最初印象,来自经常在户外见到的"金隅嘉业"房地产广告;或是听说金隅集团独家赞助了北京男女篮球队,"金隅"的名字不时出现在电视和报纸体育新闻中。当记者从北京市安全文化建设先进企业的名录中发现金隅集团赫然在册时,才真正将目光聚焦到了这家名声在外的企业。     

Carbonaceous aerosols in PM10 and pollution gases in winter in Beijing

An intensive observation of organic carbon (OC) and element carbon (EC) in PM10 and gaseous materials (SO2, CO, and O3,) was conducted continuously to assess the characteristics of wintertime carbonaceous aerosols in an urban area of Beijing, China. Results showed that the averaged total carbon (TC) and PM10 concentrations in observation period are 30.2±120.4 and 172.6±198.3 μ/m3, respectively. Average OC concentration in nighttime (24.9±19.6 μ/m3) was 40% higher than that in daytime (17.7±10.9 μ/m3). Average EC concentrations in daytime (8.8±15.2 μ/m3) was close to that in nighttime (8.9±15.1 μ/m3). The OC/EC ratios in nighttime ranging from 2.4 to 2.7 are higher than that in daytime ranging from 1.9 to 2.0. The concentrations of OC, EC, PM10 were low with strong winds and high with weak winds. The OC and EC were well correlated with PM10, CO and SO2, which implies they have similar sources. OC and EC were not well correlated with O3. By considering variation of OC/EC ratios in daytime and night time, correlations between OC and O3, and meteorological condition, we speculated that OC and EC in Beijing PM10 were emitted as the primary particulate form. Emission of motor vehicle with low OC/EC ratio and coal combustion sources with high OC/EC ratio are probably the dominant sources for carbonaceous aerosols in Beijing in winter. A simple method was used to estimate the relative contribution of sources to carbonaceous aerosols in Beijing PM10. Motor vehicle source accounts for 80% and 68%, while coal combustion accounts for 20% and 32% in daytime and nighttime, respectively in Beijing. Averagely, the motor vehicle and coal combustion accounted for 74% and 26%, respectively, for carbonaceous aerosols during the observation period. It points to the motor vehicle is dominant emission for carbonaceous aerosols in Beijing PM10 in winter period, which should be paid attention to control high level of PM10 in Beijing effectively.     

Distribution of Platinum group elements in road dust in the Beijing metropolitan area, China

Dust samples collected from the Beijing metropolitan area （China） were evaluated to determine the distribution and the concentration of platinum group elements （PGEs）. The dust particles that were smaller than 100 mesh size fraction （150 μm） were analyzed after aqua regia digestion. Concentrations ofPt, Rh, and Pd were found to be between 3.96 and 356.3 ng/g, 2.76 and 97.11 ng/g, and 0.1 and 124.9 ng/g, respectively, in the urban areas of Beijing, whereas for the background samples collected from the suburbs of Beijing, the concentrations of Pt, Pd, and Rh were very low and ranged from 0.1 to 0.9 ng/g, 0.5 to 1.4 ng/g, and 0.8 to 2.2 rig/g, respectively. The distributions of PGEs in road dust were an accurate reflection of the levels of pollution and were found to match with the local traffic conditions. A strong positive correlation was established among all the dements found in road dust. This suggests that emissions of abraded fragments from vehicle exhausts may be the source of the high concentration of Pt, Rh, and Pd in road dust along the main roads of Beijing.     

Ambient air quality trends and driving factor analysis in Beijing, 1983-2007

The interaction between pollution sources change and implementation of air pollution control measures was the main driving factor that caused the variation in air quality.