水胺硫磷降解优势菌的筛选及其降解条件的研究

本文从已驯化好的活性污泥菌是悬液中分离筛选出水胺硫磷的降解优势菌，并对其降解条件进行了实验研究，当温度为２５℃，ＰＨ为６．５～７．５，水胺硫磷进水浓度１３５ｍｇ／Ｌ，停留时间为１２ｈ，在供氧条件下，水胺硫磷降解率可达７２．３％，而混合菌在最佳条件下，其水胺硫磷降解率为５５．８％，本文还要菌种进行了鉴定。     

废水处理实用公式的推导计算

介绍由一级动力学模式推导废水处理实用公式。文中探讨了２０℃降解速率系数Ｋ２０和温度修正系数θ，仅是某种水质和生化条件下的对应值，不能任意通用。     

大气中挥发性苯系物的Carbotrap吸附气相色谱法

本文研究以Ｃａｒｂｏｔｒａｐ作吸附剂，在常温采集大气中挥发性苯系物，直接采用热脱附气相色谱分析。对新型吸附剂Ｃａｒｂｏｔｒａｐ的采样－脱附－分析精度，回收率，突破体积等作了试验。本法具有灵敏度高，操作简单，不需复杂的样品预处理，色谱峰好，吸附剂可反复使用等优点。可对大气中１０－９级苯系物进行测定，ＲＳＤ≤３．５％。     

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.     

The hierarchy and spatial characteristics of ecosystems: A reconsideration of the ecosystem concept (II)

This paper, based on the autonomy concept, continues to investigate hierarchical forms and spatial structure of ecosystems. The former can lead to limits for the selection of the component parts of an ecosystem and a distinction between its endogenous and exogenous variables; and the latter can be lead to a hypothesis of the space of an ecosystem: the space of an ecosystem = its habitat area + supporting area + impact area, and two characteristics of ecosystems, space-overlapping and the area of ecosystem space, have been further studied referring to human activities.     

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。