SCX型脱硫除尘器内部气固两相流场数值模拟

采用FLUENT软件对SCX型脱硫除尘器内部气固两相流场进行数值模拟.气相采用Realizable k-ε湍流模型,颗粒相采用离散相模型(DPM),压力-速度耦合算法选择SIMPLE进行计算.分析了装置内z=0截面上气相压力和速度的分布,并对不同粒径颗粒的浓度和运动轨迹进行计算,还在考虑重力及不考虑重力2种情况下分析了...     

利用黑碳仪获取北京市冬季气溶胶吸光系数的方法研究

黑碳仪是最常用的气溶胶吸光碳测试仪器,但其测得的吸光性能受到滤膜多重散射效应、颗粒物散射效应、颗粒物遮蔽效应的影响,只能算是b_ATN（光衰减系数）,而不是b_in-situ（原位吸光系数）.虽然已有学者提出几种将b_ATN转换为b_cor（校正后吸光系数）的算法,但多是基于实验室模拟或高海拔地区气溶胶而开展的,与我国城市的气溶胶在理化性质方面有明显差别.为探索我国城市气溶胶将b_ATN转换为b_cor的问题,于2016—2017年冬季在北京市城区使用黑碳仪及光声消光仪分别测量b_ATN和b_in-situ,在分析多种算法的基础上,提出了面向城市气溶胶的校正方法.结果显示:在我国北方城市（以北京市为例）,适应城市气溶胶的f值（遮蔽因子,为计算遮蔽校正系数的一个参数）为1.13,C（综合散射效应系数）为5.44;使用这些校正系数,将观测点由黑碳仪获取的b_ATN转换为b_cor.与光声消光仪测定的b_in-situ对比发现,无论是滤膜样点周期内还是长期观测时间内,b_cor与b_in-situ均呈一致性,其中,长期观测时间内二者的相关性表达为y=0.954x+0.829（r2为0.996）,证明了校正方法的有效性和可信性.研究显示,b_cor与b_in-situ整体相关性较高,并且获得了本地化的校正因子,实现了仅通过黑碳仪获取准确颗粒物吸光系数的目的.      

回灌型准好氧填埋场脱氮特性及加速稳定化研究

采用2个模拟填埋生物反应器,1号柱渗滤液简单回灌,2号柱为渗滤液回灌准好氧联合运行方式,研究了渗滤液回灌准好氧生物反应器填埋场的脱氮特性及加速垃圾稳定化特性.研究结果表明:渗滤液回灌准好氧填埋场具有很强的脱氮能力,2号柱由厌氧运行方式改为准好氧条件下,渗滤液中的氨氮和凯式氮浓度分别由最大值的3 198 mg/L和3 345 mg/L降低到第160 d的73 mg/L和81 mg/L,去除率分别为97.7%和97.6%,pH快速升高到8.0左右,COD浓度快速降低.渗滤液中溶解性有机物(DOM)分级结果表明,2号柱HA和FA含量的增加明显快于1号柱.2号柱DOM的三维荧光光谱特性发生了较大变化,荧光基团从60 d结构简单的类蛋白物质转变为95 d结构复杂的类胡敏酸和富里酸物质,而l号柱渗滤液DOM荧光基团一直是结构简单的类蛋白物质.结果表明回灌准好氧生物反应器填埋场的稳定化速度远快于简单回灌的生物反应器填埋场.     

Dynamic of inorganic nitrogen and amino sugar to glucosamine addition in forest soils

Environmental Science and Pollution Research - Amino sugars (AS) are routinely used as microbial biomarkers to investigate the dynamics of soil carbon (C) and nitrogen (N) under different...     

印染废水集中处理的污染源分析

简要介绍了各类印染企业的生产工艺,重点分析了废水的来源及其水质特征,指出印染废水集中处理厂在生产过程中应重视污染源的调查、分析,为其正常生产提供帮助。     

粉煤灰活化技术在诺砂制品中的应用研究

对激发粉煤灰活性的方法(物理活化和化学活化)进行了探讨,提出了一种能够大幅度提高粉煤灰活性的有效方法——细磨和化学激发复合方法。用此法活化粉煤灰制得的诺砂制品,其早期强度显著提高。同时对其活化机理进行了分析。     

土壤中十氯酮检测方法研究

十氯酮（kepone）是一种毒性较高持久性有机污染物（POPs）。目前对于土壤中十氯酮的检测较少。采用索氏提取-硅胶氧化铝层析柱净化法,GC-MS对土壤中的十氯酮进行测定,该方法线性良好（r〉0.9996）,检测限较低（〈0.14μg.kg-1）,回收率稳定（平均值为90.1%~95.8%）。是测定土壤中十氯酮的较好方法。     

城市水环境红线体系构建与划定方法研究

城市环境总体规划是一项重大环境管理制度创新,目前全国已启动了24个城市的环境总体规划编制工作,其中划定环境红线是城市环境总体规划的核心内容。结合北海市环境总体规划编制实践,首次提出了城市水环境系统解析的技术框架,将水源保护区、水(环境)功能区、水生动植物自然保护区、水产种质资源保护区和风景名胜区作为研究对象,建立水环境红线划分体系,并创新性地提出将水域控制单元和地下水污染防治分区相结合的地表地下协同控制方法,初步构建适用于城市发展与建设的空间规划体系。     

Systematic control technologies for gaseous pollutants from non-ferrous metallurgy

Air pollutant emissions represent a critical challenge in the green development of the non-ferrous metallurgy industry.This work studied the emission characteristics,formation mechanisms,phase transformation and separation of typical air pollutants,such as heavy metal particles,mercury,sulfur oxides and fluoride,during non-ferrous smelting.A series of purification technologies,including optimization of the furnace throat and hightemperature discharge,were developed to collaboratively control and...     

Is atmospheric oxidation capacity better in indicating tropospheric O3 formation?

● This study summarizes and evaluates different approaches that indicate O₃ formation. ● Isopleth and sensitivity methods are useful but have many prerequisites. ● AOC is a better indicator of photochemical reactions leading to O₃ formation. Tropospheric ozone (O₃) concentration is increasing in China along with dramatic changes in precursor emissions and meteorological conditions, adversely affecting human health and ecosystems. O₃ is formed from the complex nonlinear photochemical reactions from nitrogen oxides (NO_x = NO + NO₂) and volatile organic compounds (VOCs). Although the mechanism of O₃ formation is rather clear, describing and analyzing its changes and formation potential at fine spatial and temporal resolution is still a challenge today. In this study, we briefly summarized and evaluated different approaches that indicate O₃ formation regimes. We identify that atmospheric oxidation capacity (AOC) is a better indicator of photochemical reactions leading to the formation of O₃ and other secondary pollutants. Results show that AOC has a prominent positive relationship to O₃ in the major city clusters in China, with a goodness of fit (R²) up to 0.6. This outcome provides a novel perspective in characterizing O₃ formation and has significant implications for formulating control strategies of secondary pollutants.