塔里木油田三甘醇脱水装置参数优化研究

文章通过三甘醇脱水工艺的第三套三甘醇注醇量调整,第三套再生温度的调节、汽提气注入量调整、贫液进塔温度调整运行参数的优化,得出:当三甘醇脱水工艺循环量在3840kg/h左右时,再生效果最好,贫液浓度最高,所获得的干气水露点最低;三甘醇脱水工艺再生温度在190～200℃之间温度越高,再生效果越好;三甘醇脱水工艺再生装置在汽提气量30Nm3/h左右时,再生效果最好,贫液浓度最高,所获得的干气水露点最低。     

关于修订《贵州省环境污染物排放标准》的思考——以水污染物排放标准修订为例

DB 52/12—1999《贵州省环境污染物排放标准》自第一次修订至今已有13年,随着我省经济社会的发展,现行标准执行过程中暴露出一些不足之处,导致标准执行困难。针对现行标准中存在的问题,在对有关法律法规、本省主要工业结构、特征污染物和国外相关排放标准进行研究分析的基础上,以水污染物为例,对标准制定中有关排放等级、时段划分、污染物控制限值等内容进行了思考。     

基于Mann-Kendall检验分析里畈水库水质变化趋势研究

根据临安市环境监测站2006-2016年里畈水库的监测数据,采用Mann-Kendall非参数统计检验法对里畈水库水质变化趋势进行分析.趋势分析表明,pH和溶解氧的值总体呈上升趋势,氨氮、总磷和高锰酸盐的值总体呈下降趋势,11年间里畈水库水质总体呈上升趋势;总磷是影响里畈水库水质类别的主要因素.对各参数突变次数及时间分析表明,总磷突变最为复杂;溶解氧和氨氮变化趋势最为简单;水质突变主要集中在2007年和2016年.     

Elk River Completes Second Year With Zero Bag Failures Reported

Abstract

This paper presents results from a study conducted in two urban areas of southern California, Downey and Riverside, to examine the effect of different sources and formation mechanisms on the size distribution and temporal trends of ultrafine particles. Near-continuous data were collected for 5 months at each location. Our data clearly identified Downey as a source site, primarily affected by vehicular emissions from nearby freeways, and Riverside as a receptor site, where photochemical secondary reactions form a substantial fraction of particles, along with local vehicular emissions. In Downey, the diurnal trends of total particle number concentration and elemental carbon (EC) appear to be almost identical throughout the day and irrespective of season, thereby corroborating the role of primary emissions in the formation of these particles. This agreement between EC and particle number was not observed in Riverside during the warmer months of the year, while very similar trends to Downey were observed during the winter months in that area. Similarly, the size distribution of ultrafine particles in Downey was generally unimodal with a mode diameter of 30–40 nm and without significant monthly variations. The number-based particle size distributions obtained in Riverside were bimodal, with a significant increase in accumulation mode as the season progressed from winter to summer. During the warmer months, there was also an increase in sub-100-nm particles in the afternoon hours, between 2:00 p.m. and 4:00 p.m., that also increased with the temperature. The differences observed in the ultrafine particle distribution and temporal trends clearly demonstrated that mechanisms other than direct emissions play an important role in the formation of ultrafine particles in receptor sites of the Los Angeles Basin.     

学习"听证"

前不久。在国家环境保护总局宣教中心举办的第59期局长培训班上，为了“学习听证”专门举行了一场别开生面的环评审批模拟听证会。来自全国各地的环保局长，以不同的身份参与了这次模拟听证会。他们时而进入角色，慷慨激昂；时而又跳出听证会，指手划脚。整个模拟听证会行进有序。角色逼真，达到了“学习听证”的目的。     

聚乙烯醇精馏残渣组分分析及其环境风险评价

为评估聚乙烯醇生产中精馏残渣组分及其环境污染风险,为此类危险废物的环境管理提供技术支持,采集华东某聚乙烯醇生产企业的精馏残渣,分析其重金属以及有机污染物含量,并评估其环境风险。研究结果表明聚乙烯醇精馏残渣主要来自生产环节中的醋酸乙烯精制工段,残渣中的有机物组分主要为醋酸及其他有机酸类,其中醋酸的相对含量达到63.47%;残渣中的重金属主要包括Zn、Ni和Cr,其含量分别为404 537 mg·kg-1,8 654 mg·kg-1和5 084 mg·kg-1。环境风险评价的结果表明残渣中有机物污染物引起的环境风险在可接受范围内,而重金属污染严重,同时有很高潜在生态风险。精馏残渣中的主要环境污染风险因子为醋酸、Zn和Ni。     

关于农业生产中劳动保护问题的探讨

本文以农业农村农民为对象,从劳动保护角度分析了我国农业生产的基本特点,探讨了我国农业生产中个体防护装备的现状和特点,提出了加强农业生产劳动保护工作的对策与建议,论述了搞好农村劳动保护工作的重大意义。