A comparative study of Cu (II) biosorption on Ca-alginate and immobilized live and inactivated Cladosporium sp

Spores of Cladosporium sp. were immobilized into Ca-alginate beads via entrapment. The alginate beads and both entrapped live and inactivated spores of Cladosporium sp. were used for comparison of biosorptive capacity from aqueous solutions. The factors affecting the adsorption ability on Cu (II), such as the contact time, initial pH, temperature were investigated. The results showed that the Ca-alginate beads containing live spores of Cladosporium sp. had the maximum biosorptive capacity. The biosorption equilibrium was established in about 3 h. The maximum biosorption of Cu (II) on Ca-alginate entrapping spores and no spores were obtained between pH 4.0 and 3.5. Temperature over the range of 15-45 degrees C had no significant effect on the biosorption capacity. The biosorptive capacity increased with initial concentrations in the concentration range of 30-800mg/l. The equilibrium was well described by Langmuir biosorption isotherms. The Ca-alginate beads could be regenerated using 0.1M HCl, The biosorbents were reused in three biosorption-desorption cycles with negligible decrease in biosorptive capacity.     

管式电除尘器"伞形罩"结构特性研究

在高温、高湿窑炉烟气条件下,采用立式管式电除尘器“伞形罩”结构,能够解决其清灰不力、二次扬尘、除尘效率不稳定等问题。本研究了“伞形罩”结构的除尘机理及效率及清灰力度影响因素、抑制二次扬尘机制。研究结果表明,“伞形罩”结构除尘效率因集尘表面积的增加而提高;应用支铁框架式振打方式,振打强度明显加强;其分流机制能有效地抑制二次扬尘：从而为“伞形罩”结构的优化设计提供了依据。     

STATUS QUO & DRIVING MECHANISM OF DESERTIFICATION IN THE NORTH TIBETAN PLATEAU

ＴｈｅＮｏｒｔｈＴｉｂｅｔａｎＰｌａｔｅａｕ ,ｏｒｔｈｅＱｉａｎｇｔａｎｇＰｌａｔｅａｕ ,ａｓｔｈｅｍａｉｎｂｏｄｙｏｆｔｈｅＱｉｎｇ ｈａｉ ＴｉｂｅｔａｎＰｌａｔｅａｕｗｈｉｃｈｉｓｏｎｅｏｆｔｈｅｔｈｒｅｅｍａｊｏｒｄｉｓｔｒｉｂｕｔｉｏｎａｒｅａｓｏｆｄｅｓｅｒｔｉｆｉｃａｔｉｏｎｉｎＣｈｉ ｎａ ,ｈａｓａｗｅｌｌ ｐｒｅｓｅｒｖｅｄｎａｔｕｒａｌｅｃｏｓｙｓｔｅｍｃｈａｒａｃｔｅｒｉｚｅｄｂｙｈｉｇｈ ａｌｔｉｔｕｄｅｇｒａｓｓｌａｎｄ ,ｉｓａｎｉｍ ｐｏｒｔａｎｔａｒｅａｆｏｒｓｔｕｄｙｉ…     

川中丘陵区村级景观土壤有机碳密度和储量分析

本文综合运用了地理信息系统(GIS)、遥感(RS)和全球卫星定位系统(GPS)等技术手段,分析了人口密集的川中丘陵乡村区域土壤有机碳密度(SOCD)和储量(SOCS)的空间分布及影响因素。结果表明,区域内SOCD和SOCS平均值分别为5.58kg/m2和75.77×105g,SOCD随丘体高度的降低向四周逐渐增大,SOCS主要分布于旱地、水田等土地利用类型中。0~30cm土层和土体深度内,SOCD以冬水田最高,裸岩最低;SOCS则以丘脚旱地和轮作水田最高,裸岩最低。地形、土地利用和土地覆盖对SOCD、SOCS影响明显。     

江苏省人口产业结构与环境污染的关系研究

对江苏省1990年至2003年人口产业结构及环境污染的指标进行量化分析研究，建立了江苏省人口产业结构与环境污染之间的关系模型，并对影响污染物排放量的人口产业指标进行了分析。     

新能源汽车在我国发展的可行性分析

本文从我国石油能源短缺和汽车尾气污染环境加剧的背景出发，详细分析了目前主要的各种新能源汽车的特点及在我国发展的前景，最后得出乙醇汽车应是我国发展新能源汽车的最佳选择的结论。     

用改性活性碳纤维去除CO2原料气中的H2S

采用固定床动态吸附实验，用改性活性碳纤维（ACF）吸附去除CO2原料气中的H2S。通过改变改性剂种类、反应温度和原料气中CO2浓度，找出用改性ACF去除CO2原料气中H2S的规律。实验结果表明：常温下，可用NaON改性的ACF来消除CO2的酸性对去除H2S的不利影响；随着反应温度的升高，CO2与ACF形成的C（O＊）中间产物增多，CO2的存在有利于改性ACF去除H2S；而当反应温度过高时，CO2与ACF形成的C（O＊）中间产物发生分解，导致ACF碳化，不利于H2S的吸附去除。     

The effect of conservation tillage in managing climate change in arid and semiarid areas—a case study in Northwest China

Mitigation and Adaptation Strategies for Global Change - Coastal cities are exposed to high risks due to climate change, as they are potentially affected by both rising sea levels and increasingly...