基于分子量分布的石化污水厂出水溶解性有机物性质研究

采用超滤膜法对某石化综合污水厂二级出水进行了分级,结合TOC、UV₂₅₄和三维荧光光谱分析,对不同分子量区间中的溶解性有机物的所占比例、物质特性和成分进行了研究。结果表明：污水厂二级出水中溶解性有机物分子量小于1 kDa的有机物所占比例最高,其DOC占原水DOC的92.7%。分子量为5和10 kDa的两种组分芳香构造化程度较高。三维荧光光谱分析表明,分子量大于1 kDa的溶解性有机物主要含有蛋白质类和腐殖质类物质,其中色氨酸类芳香族蛋白质所占比例较高。     

基于SAFETI软件的天然气储配厂罐区定量风险分析

为了评估城市燃气设施的风险、提高周边居民区的安全水平、保障城市燃气的正常安全生产,通过DNV公司的SAFETI软件对于某储配厂的天然气罐区进行了泄漏后果的模拟和定量风险分析,得出了罐区天然气泄漏产生的爆炸和火灾的事故后果,及该储配厂的个人风险和社会风险水平。提出了防止和减轻事故危害的措施,并为储配厂的风险防控和应急准备提供了科学依据。结果表明即使城市燃气设施建设运营符合国家的各项标准,在发生大孔泄漏时依然可能对周边环境造成影响。     

三峡大学文思湖水污染评价

根据三峡大学文思湖近几年水质监测资料,以及对其水质状况、污染源进行调查研究的基础上,采用单因子指数评价、W值水质评价、富营养化评价、有机污染评价4种方法对文思湖进行了水体质量综合评价,以期为文思湖水环境的综合整治提供科学依据。     

Flow depth,velocity, and sediment motions in a straight widened channel with vegetated floodplains

Environmental Fluid Mechanics - Experiments were conducted in a straight channel that widens from a single channel to a compound channel based on a real navigation channel with a similar shape in a...     

新型劳动防护用品的分析与探讨

本文概述了国内外劳动防护用品的发展历程以及标准情况,分析了新型劳动防护用品的四大特点和影响其发展的主要因素。     

Kinetic vaporization of heavy metals during fluidized bed thermal treatment of municipal solid waste

Heavy metals volatilization during thermal treatment of model solid waste was theoretically and experimentally investigated in a fluidized bed reactor. Lead, cadmium, zinc and copper, the most four conventional heavy metals were investigated. Particle temperature model and metal diffusion model were established to simulate the volatilization of CdCl₂ evaporation and investigate the possible influencing factors. The diffusion coefficient, porosity and particle size had significant effects on metal volatilization. The higher diffusion coefficient and porosity resulted in the higher metal evaporation. The influence of redox conditions, HCl, water and mineral matrice were also investigated experimentally. The metal volatilization can be promoted by the injection of HCl, while oxygen played a negative role. The diffusion process of heavy metals within particles also had a significant influence on kinetics of their vaporization. The interaction between heavy metals and mineral matter can decrease metal evaporation amount by forming stable metallic species.     

Regional convergence of energy-environmental efficiency: from the perspective of environmental constraints

Environmental Science and Pollution Research - This paper conducts a convergence analysis on the energy-environmental efficiency to explore the differences between regions that reflect the...     

电子废弃物管理研究热点对比与可视化分析

随着电子产品消费量的日益增多,电子废弃物(WEEE)的数量也不断增加,WEEE管理已成为全球关注的热点环境问题。以Web of Science核心数据库和中国知网(CNKI)全文数据库相关文献作为样本,借助Citespace软件对2007—2017年国内外WEEE管理文献进行了可视化分析,旨在理清中国与国际WEEE管理的发展脉络、研究热点和前沿趋势。结果表明:(1)国际关于WEEE管理的热度不断增加,研究重点由发达国家逐渐转向发展中国家和地区;(2)WEEE管理的研究方法、研究内容和研究角度日益丰富,生产者责任延伸制度、绿色设计、生命周期评价、逆向物流和工业生态学都成为研究的热点;(3)未来中国WEEE管理研究应注重WEEE管理的立法建设和理论技术创新以及大数据与信息系统在WEEE管理方面的应用。     

Feasibility of iron scraps for enhancing nitrification of domestic wastewater at low temperatures

Environmental Science and Pollution Research - The development of an effective approach to improve low-temperature nitrification of domestic wastewater remains an important issue that needs to be...     

Neglected skin-associated microbial communities: a unique immune defense strategy of Bufo raddei under environmental heavy metal pollution

Environmental Science and Pollution Research - Amphibians defend against pathogens using skin microbial communities, in addition to innate and adaptive immunity. Despite skin microbial communities...