COD/SO_4~(2-)值对硫酸盐还原率的影响

研究利用 UASB反应器考察了 COD和硫酸盐浓度的比值对硫酸盐还原的影响 ,同时分析了硫酸盐还原菌和产甲烷菌对COD的竞争情况 .发现在 HRT为 3.8h,SO2 -4 负荷为 6～ 7kg· ( m3· d) - 1 ,SO2 -4 浓度为 1 0 0 0 mg· L- 1 条件下 :1在 COD不足时 ,SRB与 MPB在竞争中占微弱优势 ;对于产甲烷活性比较好的厌氧污泥要经过较长的时间 ,SRB才能确立优势菌种的地位 .2 COD/ SO2 -4 比值决定了 SO2 -4 的去除率 .比值等于 2时 ,SO2 -4 的还原率在 95%以上 ;当比值为 1 .5时 ,SO2 -4 还原率为 75% ;当比值为 1时 ,SO2 -4 的还原率为 60 % .     

GIS在环境影响评价中的应用

简要介绍了环境影响评价（EIA）和地理信息系统（GIS）技术的特点，阐述了两者结合的必要性。讨论了GIS技术在环境影响评价领域中的应用现状，重点介绍了GIS技术在项目EIA、区域EIA、累积EIA及战略EIA，环境影响后评价中的应用。在此基础上进一步对GIS在环境影响评价中的应用进行了展望，重点介绍了GIS在公众参与中的应用及基于“5S”的EIA。     

Catalytic oxidation effect of MnSO4 on As(III) by air in alkaline solution

The catalytic oxidation effect of MnSO₄ on As(III) by air in an alkaline solution was investigated. According to the X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) analysis results of the product, it was shown that the introduction of MnSO₄ in the form of solution would generate Na_0.55Mn₂O₄·1.5H₂O with strong catalytic oxidation ability in the aerobic alkaline solution, whereas the catalytic effect of the other product MnOOH is not satisfactory. Under the optimal reaction conditions of temperature 90°C, As/Mn molar ratio 12.74:1, air flow rate 1.0 L/min, and stirring speed 300 r/min, As(III) can be completely oxidized after 2 hr reaction. The excellent catalytic oxidation ability of MnSO₄ on As(III) was mainly attributed to the indirect oxidation of As(III) by the product Na_0.55Mn₂O₄·1.5H₂O. This study shows a convenient and efficient process for the oxidation of As(III) in alkali solutions, which has potential application value for the pre-oxidation of arsenic-containing solution or the detoxification of As(III).     

生态科学在现代景园设计中应用的发展

现代风景园林设计越来越科学化，人性化，其核心就是引入了生态科学的系统思想和方法。通过对近现代西方景园设计中生态科学应用发展阶段的阐述，说明生态科学在景园设计中应用的发展过程。表明现代景园设计的发展方向就是生态系统科学与景观设计紧密结合的综合设计理念。     

MAGIC模型及其应用进展

介绍MAGIC模型及其在预测土壤和地表水酸化趋势及确定酸沉降临界负荷中的应用,提出了该模型的应用展望。     

用Microsoft Excel模糊综合法评价空气质量

模糊综合评价，可以对受多层次、多因素影响的事物进行综合评价。，同时介绍了用此法评价的空气质量、每一天各点位诸因子的数据Micmsoft Excel软件在模糊综合评价中的应用，并指出Microsoft Excel的利用实现了评价结果可视化。     

GIS技术在环境影响评价中的应用

为了研究地理信息系统(GIS) 在环境影响评价中的应用,在介绍地理信息系统的组成、类型、功能和应用领域的基础上,分析了GIS 技术在环境影响评价中的优势.从项目环境影响评价(EIA) 的局限性出发,简述了目前EIA 的研究现状,同时概述了地理信息系统(GIS) 的功能和应用,重点讨论了环境影响评价领域中应用地理信息系统的现状、必要性及其展望.     

PASS混凝去除给水腐植酸的研究

用所研制的聚硅硫酸铝对含腐植酸原水进行了混凝处理 ,研究了投加量、pH值等对腐植酸去除效果的影响 ,探讨了PASS对腐植酸的混凝去除机理 ,并作了经济分析     

Enzymatic degradation of poly([R,S] β-hydroxybutyrate)

The synthetic analogue of a bacterially produced polyester, poly(-hydroxybutyrate) (PHB) was synthesized from racemic -butyrolactone using anin situ trimethyl aluminum-water catalyst. The polymer was fractionated into samples differing in molecular weight and isotactic diad content. The latter was closely related to degree of crystallinity. The biodegradation of these fractions were examined by monitoring mass loss over time in the presence of anAlcaligenes faecalis T1 extracellular bacterial poly(-hydroxybutyrate) depolymerase. The fraction with high isotactic diad tacticity content showed little or no degradation over a 50 hour incubation period, whereas the fraction of intermediate isotactic diad content degraded in a continuous steady fashion at a rate that was less than that for bacterial PHB. The low isotactic diad fraction underwent a rapid initial degradation, followed by no further mass loss. The presence of stereoblocks in the polymer structure of the various fractions was an influence on the degree of susceptibility towards degradation and is related to sample crystallinity.     

溶济萃取法处理含硫酸及硫酸盐的废水

采用溶剂萃取法处理含硫酸及硫酸盐的工业废水，主产优质农用硫酸钾，副产氯化铵和氮钾复合肥，整个工艺过程基本无三废排放，实现了对该废水的综合有效治理。