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Nini Pang Jian Gao Fei Che Tong M Su Liu Yan Yang Pusheng Zhao Jie Yuan Jiayuan Liu Zhongjun Xu Fahe Chai 《环境科学学报(英文版)》2020,32(9):201-209
To investigate the cause of fine particulate matter (particles with an aerodynamic diameter less than 2.5 µm, PM2.5) pollution in the heating season in the North China Plain (specifically Beijing, Tianjin, and Langfang), water-soluble ions and carbonaceous components in PM2.5 were simultaneously measured by online instruments with 1-hr resolution, from November 15, 2016 to March 15, 2017. The results showed extreme severity of PM2.5 pollution on a regional scale. Secondary inorganic ions (SNA, i.e., NO3?+SO42+ NH4+) dominated the water-soluble ions, accounting for 30%-40% of PM2.5, while the total carbon (TC, i.e., OC + EC) contributed to 26.5%-30.1% of PM2.5 in the three cities. SNA were mainly responsible for the increasing PM2.5 pollution compared with organic matter (OM). NO3? was the most abundant species among water-soluble ions, but SO42- played a much more important role in driving the elevated PM2.5 concentrations. The relative humidity (RH) and its precursor SO2 were the key factors affecting the formation of sulfate. Homogeneous reactions dominated the formation of nitrate which was mainly limited by HNO3 in ammonia-rich conditions. Secondary formation and regional transport from the heavily polluted region promoted the growth of PM2.5 concentrations in the formation stage of PM2.5 pollution in Beijing and Langfang. Regional transport or local emissions, along with secondary formation, made great contributions to the PM2.5 pollution in the evolution stage of PM2.5 pollution in Beijing and Langfang. The favourable meteorological conditions and regional transport from a relatively clean region both favored the diffusion of pollutants in all three cities. 相似文献
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装配式建筑精装修可能会应用甲醛、苯、氡气、氨气和TVOC等大量有害物质,从而产生空气污染、光污染、噪声污染、水污染等,严重影响室内环境,危害人体健康,虽然国家下发相关条例,效果并不显著。对装配式建筑精装修如何污染室内环境进行研究,分别分析了甲醛、苯、氡气、氨气和TVOC这些装修材料的危害能力、对室内环境的污染能力以及对人体健康的损害,通过研究发现装修材料会造成严重污染,必须要加以重视,采取一定措施治理,营造出一个舒适的生活环境。 相似文献
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消防与环境保护的目的都是保护人类生命财产安全。消防安全与环境保护相互影响,火灾会污染环境,破坏生态平衡。96防事业的发展减少了火灾,减轻了火灾对环境的污染和破坏,环境保护也为火灾预防工作带来了有利条件。 相似文献
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选取淮河淮南段的水质为分析对象,以氨氮作为指标参数,运用秩相关系数法,对其水质在“十一五”期间的变化趋势进行定量分析,并据此提出改善水环境质量的主要对策。 相似文献
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Hongtao Pang Hanchang Shi Huiming Shi 《Frontiers of Environmental Science & Engineering in China》2009,3(4):470-476
A pilot-scale airlift oxidation ditch using bubble diffuser and baffle as aerator was operated in a wastewater treatment plant
(WWTP) to investigate its flow characteristic and wastewater treatment performance. Compared with the conventional oxidation
ditch process, effective depth and oxygen utilization efficiency of this new process was improved by underwater aeration.
Furthermore, it had a reversed velocity distribution, which decreased from the bottom to the top on vertical section. Velocity
measurement showed that a velocity over 0.2 m/s at the bottom was sufficient to prevent sludge settlement during long term
operation. Application of these concepts would save land area and energy consumption by about 25%–50% and 55%, respectively.
In this new system, organic biodegradation and nitrification could be well achieved. Denitrification could occur steadily
in the straight part by adjusting the airflow rate. An average TN removal rate of 63% was achieved with dissolved oxygen (DO)
concentrations between 0.6 mg/L and 1.5 mg/L. The main pollutants in the effluent could meet the strictest discharge standard
(COD<50 mg/L, NH4
+−N < 5 mg/L, and TN < 15 mg/L) in China now. 相似文献