Numerical modeling of simultaneous tracer release and piscicide treatment for invasive species control in the Chicago Sanitary and Ship Canal,Chicago, Illinois

In December 2009, during a piscicide treatment targeting the invasive Asian carp in the Chicago Sanitary and Ship Canal, Rhodamine WT dye was released to track and document the transport and dispersion of the piscicide. In this study, two modeling approaches are presented to reproduce the advection and dispersion of the dye tracer (and piscicide), a one-dimensional analytical solution and a three-dimensional numerical model. The two approaches were compared with field measurements of concentration and their applicability is discussed. Acoustic Doppler current profiler measurements were used to estimate the longitudinal dispersion coefficients at ten cross sections, which were taken as reference for calibrating the longitudinal dispersion coefficient in the one-dimensional analytical solution. While the analytical solution is fast, relatively simple, and can fairly accurately predict the core of the observed concentration time series at points downstream, it does not capture the tail of the breakthrough curves. These tails are well reproduced by the three-dimensional model, because it accounts for the effects of dead zones and a power plant which withdraws nearly 80 % of the water from the canal for cooling purposes before returning it back to the canal.     

非正态概率分布的大气污染物监测数据处理方法

从概率基本公式出发，在偏态分布的约束条件下，经数学推导；建立概率积分式。通过合成氨厂大气中污染物落地浓度的计算，并与监测数据进行相关处理实例看，相关系数０．９９９。该方法适用于偏态分布大气污染物落地浓度的概率计算及预测，可供环境监测、环境管理及研究人员对大气质量分析、评价的参考和借鉴     

十二烷基苯磺酸钠淡水水质基准初探及生态风险评估

十二烷基苯磺酸钠(LAS)是一种常用的洗涤剂,具有难降解和易残留等特点,是我国水体中普遍存在的有害物质.当水中LAS浓度过高时,会对淡水水生生物的生存产生不利影响.以LAS为研究对象,结合我国淡水水生生物组成特征,筛选国内外文献中有关LAS水生生物毒性数据,涵盖5门12科19种,共40个急性毒性数据.运用毒性百分数排序...     

青海南部高原植物区系研究

文章比较全面地论述了青海南部高原的植物区系,包括地史因素、科属特点、区系成分、地理分布和植被区划,文内对森林部分做了较多的说明,并利用了若干新的调查研究成果,尤其是可可西里地区的植物调查资料,可能对今后的工作具有参阅作用。     

碱渣处理装置的现状与展望

碱渣处理一直是困扰炼厂环境保护的一大难题。碱渣处理装置成为炼厂的主要恶臭污染源，亟需处理。为此，我们通过国内外技术交流，在文献调研基础上，提出了碱渣空气氧化预处理脱臭治理方案。该工艺成熟、简单、可靠，已用于国外一些炼厂，并可大大改善大气污染，提高回收副产品的质量。     

三次设计在合成氨装置甲醇洗工序减少H2S排放和增产CO2上的应用

对镇海炼油化工股份有限公司化肥厂民氨装置甲醇洗工序层气中Ｈ２Ｓ严重超标排放问题进行了分析。通过采用三次设计、优化生产,不但使Ｈ２Ｓ排放合格率达标,而且ＣＯ２产量也超过了原设计值。     

ZPS—25型油罐自动脱水器

该自动脱水器，是已经获得国家专利的新一代脱水器，它具有价格低，设计新（双保险）安装检修方便，构造简单．占地面积小，操作平稳安全可靠，节能并符合安全、环保及职业卫生要求等特点．轻污油电脱水含油<150mg／L，是一种比较理想的自动脱水器，它可广泛用于石油、化工等企业的油罐脱水。     

含氰废水加压水解脱氰

加压水解脱氰是去除难降解的含氰废水中氰化物的有效方法之一．尽管在理论上脱氰后出水［ＣＮ－］可以小于０．５ｍｇ／Ｌ，但是，生产上达到该指标有相当难度．为此，我公司经过十来年的研究和生产探索，至１９９４年实现达标，目前反应出水［ＣＮ－］在０．３５ｍｇ／Ｌ左右．根据大量文献资料和生产数据，对脱氰反应影响因素和生产工艺参数进行理论和实践分析，找到了优化的参数搭配．     

Oil pollutant identification based on excitation-emission matrix of UV-induced fluorescence and deep convolutional neural network

Environmental Science and Pollution Research - Identifying the types of oil pollutants in a spill event can help determine the source of spill and formulate the plan of emergency responses....