金川县沙耳干河坝泥石流治理工程研究

金川县境内的沙耳干河坝泥石流沟泥石流活动频繁,暴发频率属于中等。为了减少泥石流灾害的威胁和危害,进行现场踏勘,开展泥石流的治理工程研究,具有重要意义。拦砂坝、谷坊坝、单侧防护堤、排导槽和导流堤等工程对泥石流的预防与治理具有显著作用,采用多种措施相结合的方式相对于单一措施更为有效。在治理工程的建设过程中可能引发相应的环境问题,对其中影响较大的水土流失问题提出防治措施,并进行可行性研究,同时提出实施建议。     

甲醛等室内主要污染物分布特征与影响评价

现代人80%以上的时间是在室内度过的,室内实际上已成为越来越多的人最直接、最经常的生活环境。与此同时,室内空气质量的优劣也越来越受到人们的关注。本文在呼和浩特市选择不同时间装修的居室,对其室内空气中甲醛、氨、一氧化碳、氡的含量进行了实测,分析了居室装修后室内主要空气污染物的污染水平以及各污染物的分布特征。数据表明,目前新近装修的居室内存在严重的甲醛污染,其超标率达到55.81%,随装修后时间的推移室内甲醛含量逐渐减少,其超标率逐渐降低,说明室内甲醛含量与室内通风状况有明显的正相关性;在所测定的居室中,一氧化碳及氨均未超标,氡的超标率为20%。     

浅谈化工园区企业无组织排放有机废气的防治对策研究

当前,中国已基本实现了化工类企业的进园入区,虽然各企业实现了废气的达标排放,但由于叠加效应等因素的影响,化工异味已经成为环境监管的难点和群众投诉的焦点。通过对化工园区内企业无组织排放的各类有机废气的特点、毒性、种类和来源进行剖析,探讨了无组织排放有机废气的收集处理方法和相应治理措施对策,对该类废气的日常环境监管提出了具体建议,并结合实际案例强化了对无组织废气进行防治是完全可行和必要的。未来,加强化工园区内企业无组织排放废气的监管和新废气治理技术的研发应用,区域环境空气质量和群众对环境满意率必将得到显著提高。     

滨海石化项目环境综合风险评估方法研究

研究针对国内目前的研究现状,运用环境风险评价指数法建立滨海石化项目环境风险评估体系,采用层次分析法和熵权法结合的组合赋权法,结合专家咨询法进行指标的修改与完善,运用线性加权组合法对评估体系中指标权重的赋值,并计算滨海石化项目的环境风险等级,确定项目的风险强弱.实例分析表明环境风险管理在环境风险的产生和预防占有十分重要的地位,通过加强和完善环境风险的管理体系,结合环境因素的敏感程度及风险源的产生和影响,能降低环境风险及事故的影响程度.     

Thiolated arsenicals in arsenic metabolism: Occurrence, formation, and biological implications

Arsenic (As) is a notoriously toxic pollutant of health concern worldwide with potential risk of cancer induction, but meanwhile it is used as medicines for the treatment of different conditions including hematological cancers. Arsenic can undergo extensive metabolism in biological systems, and both toxicological and therapeutic effects of arsenic compounds are closely related to their metabolism. Recent studies have identified methylated thioarsenicals as a new class of arsenic metabolites in biological systems after exposure of inorganic and organic arsenicals, including arsenite, dimethylarsinic acid (DMAV), dimethylarsinous glutathione (DMAIIIGS), and arsenosugars. The increasing detection of thiolated arsenicals, including monomethylmonothioarsonic acid (MMMTAV), dimethylmonothioarsinic acid (DMMTAV) and its glutathione conjugate (DMMTAVGS), and dimethyldithioarsinic acid (DMDTAV) suggests that thioarsenicals may be important metabolites and play important roles in arsenic toxicity and therapeutic effects. Here we summarized the reported occurrence of thioarsenicals in biological systems, the possible formation pathways of thioarsenicals, and their toxicity, and discussed the biological implications of thioarsenicals on arsenic metabolism, toxicity, and therapeutic effects.     

Growth inhibition and oxidative damage of Microcystis aeruginosa induced by crude extract of Sagittaria trifolia tubers

Aquatic macrophytes are considered to be promising in controlling harmful cyanobacterial blooms. In this research, an aqueous extract of Sagittaria trifolia tubers was prepared to study its inhibitory effect on Microcystis aeruginosa in the laboratory. Several physiological indices of M. aeruginosa, in response to the environmental stress, were analyzed. Results showed that S. trifolia tuber aqueous extract significantly inhibited the growth of M. aeruginosa in a concentration-dependent way. The highest inhibition rate reached 90% after 6 day treatment. The Chlorophyll-a concentration of M. aeruginosa cells decreased from 343.1 to314.2 μg/L in the treatment group. The activities of superoxide dismutase and peroxidase and the content of reduced glutathione in M. aeruginosa cells initially increased as a response to the oxidative stress posed by S. trifolia tuber aqueous extract, but then decreased as time prolonged. The lipid peroxidation damage of the cyanobacterial cell membranes was reflected by the malondialdehyde level, which was notably higher in the treatment group compared with the controls. It was concluded that the oxidative damage of M. aeruginosa induced by S.trifolia tuber aqueous extract might be one of the mechanisms for the inhibitory effects.     

炼厂职工安全心理状态研究

探讨了炼厂职工心理因素与安全生产的联系,阐述了可能诱发事故的几种心理状态,从心理学的角度剖析了不安全心理状态的产生原因,提出了安全对策。     

慢速渗滤土地处理法去除污水中污染物的效率研究

本文就不同水质、不同水量、不同作物对慢速渗滤系统中污染物去除效率进行了探讨.通过该法与其它土地处理法和人工常规二级、三级污水处理技术对污染物去除率的比较,表明慢速渗滤土地处理法效果更好.     

用脉冲电旋风除尘器处理催化剂厂分子筛尾气

介绍了脉冲电旋风除尘器的工作原理及用其处理催化剂分子筛尾气的试验情况。试验结果表明,分子筛尾气很适合脉冲电旋风除尘处理,除尘效果较好,在进气含尘质量浓度为1324．9mg／m^3时,除尘效率达89．4％左右,粉尘驱进速度达0．15～0．17m／s,比常规电除尘技术提高1倍左右。