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891.
Cho Kanghee Kang Jinkyu Kim Songbae Purev Oyunbileg Myung Eunji Kim Hyunsoo Choi Nagchoul 《Environmental science and pollution research international》2021,28(35):48184-48193
Environmental Science and Pollution Research - Thermal treatment of mercury (Hg)-contaminated soil was studied to investigate the desorption behavior of Hg at different temperatures. The soil... 相似文献
892.
O Nam-Chol Jo Chun-Hung Kang Kon-Ho Kim Ryon-Hui Kim Song-Il 《Environmental science and pollution research international》2021,28(11):13365-13374
Environmental Science and Pollution Research - Municipal solid waste (MSW) is regarded to be an important source of greenhouse gas emissions, which could result in a significant impact on climate... 相似文献
893.
基于文献计量分析的长江经济带农田土壤重金属污染特征 总被引:2,自引:1,他引:1
长江经济带是我国重大战略发展区域之一,理清长江经济带农田土壤重金属污染特征与来源对区域土壤重金属污染防控和农业安全生产具有重要意义.在检索文献数据的基础上,结合空间分析和地累积指数法分析了长江经济带农田土壤重金属(Cd、Cr、Hg、As、Pb、Cu、Zn和Ni)的污染特征、环境风险和主要来源.结果表明:①农田土壤Cd、Cu、Pb、Hg、Zn和As超过农用地土壤污染风险筛选值的比例分别为39.8%、18.5%、8.3%、6.9%、6.9%和6.4%,其中土壤Cd的超标比例最高;②不同区域农田土壤重金属空间分异明显,上游土壤Cr、Cu、Zn和Ni含量高于中游和下游地区,中游土壤Cd、As和Pb含量高于上游和下游地区;③研究区8种重金属的地累积指数分别为:Cd (0.42)>Hg (-0.28)>Pb (-0.32)>Zn (-0.39)>Cu (-0.42)>Cr (-0.7)>As (-0.81)>Ni (-0.73),其中土壤Cd和Hg地累积风险最高;④长江经济带中上游地区农田土壤重金属累积主要受地质高背景和矿山开采等因素影响,中下游地区主要受到快速城镇化、工业生产和高强度农业利用等因素的影响.针对长江经济带农田土壤重金属污染现状及管控需求,建议加强农田土壤重金属的源头防控,根据重金属污染程度、地质背景和农产品质量等进行农田土壤重金属污染的分区分级管控和分类管理,以期实现长江经济带农田土壤环境质量安全和农业绿色可持续生产. 相似文献
894.
气溶胶地基观测数据和颗粒物浓度数据的同步定量评估可为了解长安区大气污染的垂直分布特征,制定合理的大气污染控制提供更有效的依据.基于CE-318太阳光度计观测数据,分析了2018年10月~2021年4月西安市长安区月均和季均气溶胶光学特性分布和变化特征,结合近地面颗粒物浓度数据,分析了不同季节、不同污染程度下气溶胶光学厚度(AOD)对颗粒物浓度的响应.结果表明:(1)观测期间长安区AOD季节变化分明:秋季(1.02)>冬季(1.00)>夏季(0.63)>春季(0.47); AOD月度、年际差异大,2019年AOD(0.51)略高于2020年(0.48).(2)整个观测期间长安区气溶胶主控模态存在明显的季节、月度差异,从春季到冬季气溶胶主控模态逐渐从粗模态向细模态转变;2019年气溶胶主控模态的季节变化与整个观测时段类似,2020年各季节气溶胶Angstrom波长指数(Angstrom)分布稳定,气溶胶粒子均以粗模态的形式存在;整个观测时段来看长安区气溶胶类型以混合型气溶胶为主.(3)AOD和Angstrom的关系存在明显的季节差异,春季大气污染以粗模态的气溶胶粒子为主导... 相似文献
895.
Won-Seok Yang Jang-Soo Lee Se-Won Park Jae-Jun Kang Tanvir Alam Yong-Chil Seo 《Journal of Material Cycles and Waste Management》2016,18(3):509-516
To recycle polyurethane foam waste generated from electric appliance recycling centers for use as fuel in a gasification process, polyurethane solid refuse fuel fabricated as pellets was analyzed for the characteristics of elemental composition, proximate analysis, heating value, and thermo-gravimetric testing. It has a high heating value of 29.06 MJ/kg with a high content of combustibles, which could be feasibly used in any thermal process. However, the nitrogen content, of up to 7 %, was comparably higher than for other fuels such as coal, biomass, and refuse-derived fuel, and may result in the emission of nitrogenous pollutant gases of HCN and NH3. By conducting gasification experiments on polyurethane solid refuse fuel in a fixed-bed reactor, a syngas with a heating value of 9.76 kJ/m3 and high content of both H2 and CO were produced with good gasification efficiency; carbon conversion 54 %, and cold gas efficiency 60 %. The nitrogenous pollutant gases in syngas were measured at the concentrations of 160 ppm hydrogen cyanide and 40 ppm ammonia, which may have to be reduced using proper cleaning technologies prior to the commercialization of gasification technology for polyurethane waste. 相似文献
896.
氧化-混凝工艺处理碱性含砷废水的技术改造 总被引:1,自引:0,他引:1
针对某锑冶炼厂已有氧化-混凝法处理碱性含砷废水工艺中存在的药剂成本较高的问题,通过将氧化剂由双氧水改为次氯酸钠,将混凝剂由硫酸铁改为聚合硫酸铁,并采用二次混凝工艺,得出了废水处理效率和药剂成本的变化情况。结果表明,经技术改造后的工艺能在保证废水处理效率的前提下,使药剂成本有较大幅度的下降。 相似文献
897.
Jinhui Liang Peng Gao Benhang Li Longfei Kang Li Feng Qi Han Yongze Liu Liqiu Zhang 《Frontiers of Environmental Science & Engineering》2022,16(12):150
898.
Kim Na Kyong Kang Dong Hee Lee Wonoh Kang Hyun Wook 《Environmental Modeling and Assessment》2022,27(3):461-472
Environmental Modeling & Assessment - As the number of enclosed residential buildings increases to minimize energy consumption, research on indoor air quality is becoming more important.... 相似文献
899.
Chen Kang Liao Chenggang Li Ping Li Xingong Li Xianjun Zuo Yingfeng 《Journal of Polymers and the Environment》2022,30(6):2209-2221
Journal of Polymers and the Environment - Poor interfacial compatibility between wheat straw and polylactic acid (PLA) remains a problem that directly affects the overall performance of wheat... 相似文献
900.
Na Liu Dan Li Kang Li Liping Wang Ruiwei Xu Jiaming Zhang Bairen Yang 《环境科学学报(英文版)》2021,33(5):108-118
Biotrickling filters (BTFs) for hydrophobic chlorobenzene (CB) purification are limited by mass transfer and biodegradation. The CB mass transfer rate could be improved by 150 mg/L rhamnolipids. This study evaluated the combined use of Fe3+ and Zn2+ to enhance biodegradation in a BTF over 35 day. The effects of these trace elements were analysed under different inlet concentrations (250, 600, 900, and 1200 mg/L) and empty bed residence times (EBRTs; 60, 45, and 32 sec). Batch experiments showed that the promoting effects of Fe3+/Zn2+ on microbial growth and metabolism were highest for 3 mg/L Fe3+ and 2 mg/L Zn2+, followed by 2 mg/L Zn2+, and lowest at 3 mg/L Fe3+. Compared to BTF in the absence of Fe3+ and Zn2+, the average CB elimination capacity and removal efficiency in the presence of Fe3+ and Zn2+ increased from 61.54 to 65.79 g/(m3?hr) and from 80.93% to 89.37%, respectively, at an EBRT of 60 sec. The average removal efficiency at EBRTs of 60, 45, and 32 sec increased by 2.89%, 5.63%, and 11.61%, respectively. The chemical composition (proteins (PN), polysaccharides (PS)) and functional groups of the biofilm were analysed at 60, 81, and 95 day. Fe3+ and Zn2+ significantly enhanced PN and PS secretion, which may have promoted CB adsorption and biodegradation. High-throughput sequencing revealed the promoting effect of Fe3+ and Zn2+ on bacterial populations. The combination of Fe3+ and Zn2+ with rhamnolipids was an efficient method for improving CB biodegradation in BTFs. 相似文献