论企业环境责任的承担

经济的发展伴随着严重的环境问题,企业与环境的关系、企业自身的发展、国家的法律法规等诸多方面决定了企业在谋求自身利益的同时,应当积极履行环境责任。通过借鉴国外成功经验,可使我国企业承担环境责任的过程少走弯路。针对我国现状,从绿色采购、绿色生产、绿色回收几方面提出了我国企业承担环境责任的具体措施。     

T-2毒素的毒性效应及致毒机制研究进展

T-2毒素是由多种镰刀菌产生的单端孢霉烯族化合物中毒性较强的一种毒素,广泛存在于谷物和谷类食品中.经食物连续摄入T-2毒素会对人类和动物的健康造成潜在危害.目前,T-2毒素对人和动物健康的影响受到了社会的广泛关注,已成为毒理学领域研究的热点课题之一.在综述了T-2毒素的生物转化、代谢途径及其毒理学效应与机制基础上,对现...     

末次间冰期以来渭河盆地沉积相变化及其影响

渭河盆地南依秦岭、北邻黄土高原,保存了巨厚的风尘河湖相沉积序列,是研究新生代气候环境演化的理想场所.以位于西安凹陷区域的西安市鄠邑区正庄村获取的14 m钻孔岩心作为研究对象,通过与邻近的渭南黄土剖面粒度曲线和全球LR04深海氧同位素曲线对比,构建了岩心序列的年代标尺,利用粒度、磁化率等指标探讨风尘-湖相沉积对风力和水动力的不同响应.对粒度测试结果采用威布尔分布(Weibull-distribution)拟合方法,提取了4个粒度组分指示不同沉积相及变化,结果表明:(1)西安凹陷鄠邑地区在末次间冰期结束时发生了一次沉积相变,由湖泊沉积转向风成沉积;(2)尽管沉积相发生变化,粒度指标对沉积环境变化响应仍然敏感,与黄土和石笋记录可良好对比,揭示出末次间冰期以来渭河盆地沉积环境的显著变化.     

Speciation characterization and coagulation of poly-silica-ferric-chloride：The role of hydrolyzed Fe（Ⅲ） and silica interaction

The highly e cient inorganic polymer flocculants (IPFs) of the ferric-silica system is a new and promising coagulant. Interactions between ferric species and silica play a large part in the coagulation of suspensions. These e ects are quite distinct from those associated with polymeric or colloid silica. However, although these species are key to coagulation e ciency, they have not been comprehensively discussed. A new type of coagulant, poly-silica-ferric-chloride (PFSC), was synthesized by co-polymerization and characterized by time complexation spectroscopy and photon correlation spectroscopy. Compared with traditional ferric salt, the results indicated that PFSC had a higher molecular weight, lesser positive charge, lower Feb and higher Fec. The higher the Si/Fe ratio, the higher the silica and lower the silicac found. The PFSC with appropriate polysilica acid not only obtained better coagulation/flocculation e ciency in turbidity removal, enhanced the flocculation index (FI) and provided less residual ferric, it also lowered water treatment costs compared to traditional ferric salt. Results showed that PFSC could remove colloid particles in water by charge neutralization and sweeping, adsorption bridging mechanism.     

Fabrication and characterization of lightweight aggregate prepared from steel mill sludge in one step

Journal of Material Cycles and Waste Management - The qualified green lightweight aggregate (LWA) was successfully prepared from steel mill sludge (SMS) and fly ash (FAS) in one step using the...     

Agricultural non-point sources and their effects on chlorophyll-a in a eutrophic lake over three decades (1985–2020)

Environmental Science and Pollution Research - Erhai Lake is the second largest freshwater lake in Yunnan Province but suffers from the deterioration of water quality and agricultural non-point...     

Direct degradation of methylene blue by unactivated peroxymonosulfate: reaction parameters,kinetics, and mechanism

Environmental Science and Pollution Research - Advanced oxidation processes (AOPs) are efficient methods for water purification. However, there are few studies on using peroxymonosulfate (PMS) to...     

The U.S.-China Supply Competition for Rare Earth Elements: a Dynamic Game View

Environmental Modeling & Assessment - Rare earth elements govern today’s high-tech world and are deemed to be essential for the attainment of sustainable development goals. Since the...     

Multiple-pattern parameter identification and uncertainty analysis approach for water quality modeling

This paper presents a multiple-pattern parameter identification and uncertainty analysis approach for robust water quality modeling using a neural network (NN) embedded genetic algorithm (GA). The modeling approach uses an adaptive NN–GA framework to inversely solve the governing equations in a water quality model for multiple parameter patterns, along with an alternating fitness method to maintain solution diversity. The procedure was demonstrated through a coupled 2D hydrodynamic and eutrophication model for Loch Raven Reservoir in Maryland. The inverse problem was formulated as a nonlinear optimization problem minimizing the degree of misfit (DOM) between model results and observed data. A set of NN models was developed to approximate the input-output response relationship of the Loch Raven Reservoir model and was incorporated into a GA framework in an adaptive fashion to search for near-optimal solutions minimizing the DOM. The numerical example showed that the adaptive NN–GA approach is capable of identifying multiple parameter patterns that reproduce the observed data equally well. The resulting parameter patterns were incorporated into the numerical model, and a multiple-pattern robust water quality modeling analysis, along with a compound margin of safety (CMOS) method, was proposed and applied to analyze the parameter pattern uncertainty.     

响应面法优化阴阳极同时作用电化学法处理染料废水

在自制电化学反应器中,以甲基橙模拟染料废水为处理对象,采用Box-Behnken Design响应面法研究了影响阴阳极同时作用电化学法处理染料废水的因素及其交互作用。实验得出各因素对废水脱色率影响的大小顺序为：电流密度> Fe³⁺浓度>Cl^-浓度。各因素之间的交互作用对废水脱色率影响的大小顺序为：电流密度和Fe³⁺浓度>电流密度和Cl^-浓度>Fe³⁺浓度和Cl^-浓度。优化结果表明：Fe³⁺浓度为1.02 mmol/L、Cl^-浓度为10.96 mmol/L、电流密度为11.52 mA/cm²时,最佳脱色率为94.67%。阴阳极同时作用电化学法对甲基橙去除效果显著。