The study for polyaromatic hydrocarbons decay on Chinese coal soot particles in atmosphere

A study for the photochemical behavior of some polyaromatic hydrocarbons (PAH), for example B(a )P, B( k )F and fluoranthene in coal smoke particles was performed by using indoor Teflon smog chamber.Experiments suggest that the photochemical reaction of PAH is first order reaction and kinetic rates of some PAH were obtained. It was shown that the reaction rate constant is proportional to light intensity and water vapor concentration. Temperature and PAH loading also have influence on PAH decay rate. A model for PAH loss has been set up on the basis of the results of our experiments and the simulating results of this model suggest that coal particle PAH half lives are of the order of a period of days in winter and a few hours in summer. Other factors which may have effect on the photochemical reaction of PAH have also been discussed.     

硫精砂尾矿还原硫酸烧渣的研究

利用硫精砂尾矿还原硫酸烧渣，从而提高烧渣中的铁的浸出率，达到综合利用尾矿及烧渣，减轻污染的目的。结果表明，把烧渣和尾矿按４－６比１的比例混合，在７００－８００℃处理３０ｍｉｎ，铁的浸出率比处理前增加３倍。文中还讨论了还原机理。     

Preconcentration and determination of trace copper(II) in natural water using silica gel modified with 1-(2-pyridylazo)-2-naphthol

Trace copper (II) in water can be preconcentrated using silica gel modified with 1-(2-pyridylazo)-2-naphthol (PAN) and be determined spectrophotometri-cally. The conditions for the preconcentration were studied. The method was applied to both artificial and natural water samples and the results suggest that copper (II) of ppb level in water can be measured accurately after the preconcentration.     

火电厂浮升烟流穿透模型分析

通过对现有浮升烟流穿透模型的分析,考虑了非均匀层结大气对烟流抬升的影响,提出了一个较为合理的穿透模型,区域性火电厂实例计算结果表明它是有效的.因此,该模型为大型火电厂环境影响评价提供了一种估算浮升烟流穿透过程的实用方法.     

浅析环境统计工作中存在的问题及改进方法

针对环境统计存在的问题，分析产生的原因，并提出解决环境统计工作问题的方法。     

ASMs模型中异养菌减衰系数之间的关系及其测定

国际水协(IAWQ)推出的ASM1、ASM2、ASM2D号模型中描述微生物的衰亡过程采用了死亡-再生模式,而ASM3号模型中描述微生物的衰亡则采用了传统减衰模式,文章从两种减衰模式的机理出发,指出了两者之间的区别与联系,并详细推导了两种减衰模式中各参数之间的关系,以此得出了异养菌传统减衰系数bH'和死亡-再生减衰系数bH的测定计算方法。文中在20℃条件下,对以印染废水为主的实际污水处理厂活性污泥的异养菌减衰系数bH'和bH进行了测定,所得结果分别为0.20和0.50。     

云南省利用水泥回转窑处置危险废物的前景

利用独特的设备和水泥窑的工艺特点,用废物代替水泥生产中的原材料,合理处置危险废物,使环境治理和循环经济达到有效的结合,是一项废物处理和资源化的新途径,是水泥生产企业可持续发展的方向之一,具有广阔的发展前景。     

抚仙湖面源污染特征及其防治对策

根据抚仙湖径流区污染物负荷量的调查结果,抚仙湖水污染特征以面源为主,面源入湖水量占98%,TP占81.4%,TN占85.9%,因此控制面源是保护抚仙湖的关键。提出了防治抚仙湖面源污染的生态治理及工程治理对策。     

美国化学品危害信息的传递

1970年美国颁布<职业安全卫生法>,要求企业将作业场所化学品的危害告知作业人员.为贯彻该法的要求,20世纪80年代初期,美国职业安全卫生管理局(OSHA)颁布危害信息传递标准(HCS),要求化学品生产和进口商对生产和进口的化学品进行危害评估,并要求所有企业将有害化学品的信息传递给作业人员.