嘉陵江广元段流域水污染防治对策

本文就广元市境内嘉陵江流域水环境的形势、问题和达到的目标进行了分析探讨，提出了嘉陵江广元段流域水防治的对策措施。     

城市控制爆破工程的爆破事故和爆破公害研究

爆破事故和爆破公害是关于爆破工程中的安全问题 ,笔者对爆破事故中的早爆、拒爆和爆破公害中的爆破振动、爆破空气冲击波、爆破飞石进行了详细论述 ,分析了爆破事故及公害产生的原因 ,从而给出了相应的防止措施 ;进而依法采取了爆破安全管理可行办法     

区域性旱涝灾害序列的信息量及分维的研究

本文依据 C· E· Shannon的信息量概念 ,定义了旱涝灾害序列的信息量公式。以安徽省长江、淮河流域的旱 (涝 )灾害序列为例进行了研究 ,初步计算出相应的信息量、信息维 ,并得出如下结论 :1旱 (涝 )序列的信息量随时间是波动的、衰减的 ;2大旱 (大涝 )前信息量增加 ,信息维降低 ;3区域性旱 (涝 )序列的信息维一般在 0 .70～ 0 .90之间     

大中城市震害预测与辅助决策的空间分析

利用GIS的空间分析功能，对大中城市防震减灾示范研究成果进行了空间区划分析，给出了城市高危害街区的计算方法和结果，同时给出了各种结构类型房屋破坏面积、人员伤亡和无家可归人口数在各个街区的空间分布结果，以及基于此空间分布结果的医疗救护、人员疏散和物资供应等辅助决策分析。该分析的主要意义在于能充分了解大中城市潜在震害的空间分布，为震前采取相应预防措施和震后开展应急救灾工作提供了方便。     

天然黏土材料附着纳米TiO2对 电解锰渣中锰的吸附固定

采用机械球磨法对膨润土、硅藻土、高岭土3种天然黏土材料进行预处理,通过超声法将纳米TiO_2附着于其上制得复合材料,考察了不同复合材料加入量及养护时间条件下复合材料对电解锰渣中Mn的吸附固定效果。3种天然黏土材料中,硅藻土的平均粒径最小,比表面积和总孔隙度最大,对水中Mn的吸附量也最大。黏土材料附着纳米TiO_2后对电解锰渣中Mn的吸附固定效果较单纯黏土材料有明显改善。在养护时间为12 d、硅藻土附着纳米Ti O_2复合材料加入量为10%(w)的最佳条件下,Mn的TCLP浸出量较原电解锰渣下降了83.04%。     

洞庭水患与生态环境保护

本文分析了洞庭湖流域生态环境破坏对洪涝造成的影响,指出流域生态环境受到破坏主要是人类违背自然规律、破坏森林植被、盲目围湖造田、生产及建设性破坏河道及湖滩所致。文章还就根治洞庭水患的关键性措施——搞好生态恢复,提出了几点意见。     

Effect of surfactants on solubilization and degradation of phenanthrene under thermophilic conditions

The bioavailability and biodegradation of polycyclic aromatic hydrocarbons (PAHs) can be increased through the addition of surfactants. Previous studies of this nature have been conducted under mesophilic conditions. Hence, the aim of the present study was to investigate the effects of synthetic surfactants and biosurfactants on solubilization and degradation of phenanthrene (PHE) in a series of batch solution experiments under thermophilic conditions. Tween 80, Triton X-100, and biosurfactants produced from Pseudomonas aeruginosa strain P-CG3 (P-CG3) and Pseudomonas aeruginosa ATCC 9027 (P. 9027) were used in this study. Surfactants effectively enhanced the solubility of PHE at 50 degrees C and the biosurfactant from P-CG3 was most effective with a 28-fold increase in apparent solubility of PHE at a concentration of 10 x critical micelle concentration (CMC) compared with the controls. However, addition of synthetic surfactants or biosurfactants inhibited the biodegradation of PHE in mineral salts medium by an isolate Bacillus sp. B-UM. Degradation of PHE diminished with increasing surfactant concentrations, and PHE degradation was completely inhibited for all the surfactants tested when the concentrations were greater than their respective CMC. The growth test suggested that Tween 80 and biosurfactants were degradable, but preferential utilization of these surfactants as substrates was not the mechanism for explaining the inhibition of PHE biodegradation. Because of the hydrophobic property of B-UM, degradation inhibition of PHE by surfactants was probably due to the reduction of direct contact between bacterial cells and PHE.     

Modeling the fate of benzo[a]pyrene in the wastewater-irrigated areas of Tianjin with a fugacity model

A Level III fugacity model was applied to characterize the transfer processes and environmental fate of benzo[a]pyrene in wastewater-irrigated areas of Tianjin, China. The physical-chemical properties and transfer parameters of benzo[a]pyrene were used in the model and the concentration distribution of benzo[a]pyrene in sediment, soil, water, air, fish, and crop compartments, as well as transfer fluxes across the compartments, were then derived under steady-state assumptions. The calculated results were compared with monitoring data for air, soil, water, and sediment collected from the literature. The results indicate that there was generally good agreement and the differences were within an order of magnitude for air, soil, and sediment. The concentration of benzo[a]pyrene in the ambient air in the area was very low with a majority present sorbed to aerosol. In the water compartment, approximately 70% of benzo[a]pyrene dissolved in water phase. Relatively high concentrations of the compound were found in the soil and sediment, with the soil serving as the dominant sink in the area. Benzo[a]pyrene, with a slow metabolic rate, was found to accumulate in fish in the area.     

废钻井液固化实验研究

利用经实验筛选的固化剂配方对废钻井液进行了固化处理的室内配方研究。结果表明,经该固化剂配方处理后的固结材料在水中浸泡5d后的浸出液在色度、化学需氧量、pH值、石油类、悬浮物含量和重金属含量等指标方面可达到国家《污水综合排放标准》(GB8978-1996)中的二级标准。     

超声强化高级氧化技术降解水中有机污染物的研究进展

介绍了用于降解水中有机污染物的超声强化技术，分析了超声与臭氧氧化、Fenton试剂氧化和光催化氧化等高级氧化技术联用的机理，综述了这些联用技术在降解有机污染物方面的研究进展，并展望了超声强化高级氧化技术的发展前景。