Electrokinetic remediation of soils contaminated with heavy metals

This paper describes the results obtained from an electrokinetic treatment of a real soil polluted by lead acetate. Powdered soil samples were pressed with a consolidometer till 100 kPa to obtain cylindrical specimens with the same characteristics as a subsoil. Tests were carried out in a Perspex electrochemical cell where soil specimens were introduced with a hollow punch. A low intensity direct current was applied in order to remove contaminants, due to electrophoresis and electroosmosis phenomena. The water flow, conductivity, apparent electroosmotic coefficient, as well as other characteristic parameters, were measured throughout the test. The water content and degree of pore saturation were estimated at the beginning and end of the test. The soil slab was divided into four slices and the Pb concentration profile determined. The main factor governing the extraction of contaminant was found to be the pH in the acidic range. Indeed, under these conditions high removal efficiencies could be reached. These results could lead to the design of a new electrochemical treatment cell equipped with a cationic membrane to expand the region of favourable pH within the soil.     

叶子花红色素提取工艺的优化

本文研究了用树脂吸附和分离叶子花红色素，比较了4种树脂对叶子花红色素的吸附，在叶子花红色素提取过程中用AB－8树脂吸附，洗脱剂用40％的乙醇，洗脱效果好，且AB－8树脂使用20次后吸附性能仍稳定。     

宜兴抽水蓄能电站环保及水土保持工程的综合利用

介绍了宜兴抽水蓄能电站建设过程中对环保及水土保持工程综合利用的做法.项目利用实施4#拦渣坝环保及水土保持工程,根据所处区域的地形、地貌,通过对4#拦渣坝的设计优化,不但使其具有拦挡冲沟的泥沙进入下水库的功能,又利用改进坝型形成一定供水能力的小水库解决了可以提供符合标准的生活用水的难题,从而提升了4#拦渣坝的复合功能,实现了该电站环保及水土保持工程的综合利用.     

深基坑土钉支护的有限元分析

本文阐述了土钉支护的发展简史，针对济南济享大厦土钉支护开挖深基坑进行有限元分析并取得较准确的结果，说明在深基坑土钉支护设计中应注意的问题．     

利用Love波特性计算地基动力响应

本文利用Love波弥散特性在频域上对地基出平面振动及扭振问题进行了研究。在计算区域内结构将采用有限单元划分,而在边界上则根据Love 面波特性使用传递边界有限单元。本文同时讨论了不同模态波对结构动力响应的贡献。本文方法也适合于静力分析。     

加速水保草业建设 提高生态经济效益

水保种草有山地治理、改土开发、松林改造、封禁培育四种类型，是水土保持主要植物措施之一，见效快，效果好，效益显著。要提高认识，建立基地。做好草的转化利用．     

水土保持工程施工阶段的设计变更

通过对水土保持工程施工阶段设计变更原因的分析，指出水土保持生态工程施工阶段变更的必要性和建设、监理单位对变更管理的重要性。通过对变更设计的程序和原则进行的分析，阐述了变更设计涉及的几个主要问题。     

半空间饱和土中瑞利波特性

通过对饱和土中波的运动方程及连续方程分析，推导了饱和土中瑞利波特征方程，讨论了半空间饱和土中瑞利波波速度的弥散特性，以及位移和孔压分布情况。     

FACTORS AFFECTING THE SOIL MICROBIAL QUALITY MEASUREMENTS OF BIOMASS QUOTIENT AND RESPIRATION QUOTIENT

The soil microbial biomass quotient (expressed as a percentage of the total soil organic carbon) and the specific rate of carbon-dioxide production by soil microbes (respiration quotient) are often used as indicators of stress on soil microbial populations. A low biomass quotient or a high respiration quotient is considered to be an indication of stress from, for example, toxicity from metals in sewage sludge applied to soils. These metabolic quotients are affected by a wide variety of other factors such as the biodegradability of soil organic-carbon amendments, plant inputs of organic carbon into soils, natural variations in microbial population sizes with depth, and in the rhizosphere of plants. These variations could be sufficiently large to make interpretation of changes in biomass quotient and respiration quotient, as a response to stress, problematical.