膜生物反应器净化污水的硝化反硝化性能

比较了膜生物反应器(MBR)和传统活性污泥工艺(CAS)在相同运行条件下处理生活污水的硝化和反硝化性能.结果表明,MBR对NH4 -N和TN的去除率分别比CAS高54.8%和37.3%.2种工艺的亚硝化、反硝化作用均呈零级反应,对应降解速率常数MBR分别约为CAS的2.2倍和2.5倍;CAS中硝化作用为零级反应,而MBR中硝化作用随时间推移趋于平缓.MBR中的细菌总数、硝酸菌、亚硝酸菌和反硝化菌数量分别比CAS工艺中相应菌种高1~2个数量级.通过控制曝气强度或减小回流通道断面限制缺氧区溶解氧质量浓度,可提高MBR中的反硝化效果.     

图结构与GIS组件在复杂应用系统中的应用

通信资源的应用可谓无处不在,而要想反映各个资源之间的这种错综复杂的关系,简单的线性结构已不能满足需求,于是图结构的采用成为应用主流。为了能够使得图结构反映的实际地理情况更加形象直观的表现出来,GIS技术的应用更是不容忽视。     

改性微粒硅溶胶的研制及应用机理研究

The preparation and their application in papermaking of aluminium modified silica sol (AMS) and boron modified silica sol (BMS) were first investigated in China. At the same time the structures and configurations of AMS and BMS were first time authenticated. The modified silica sol microparticle system was detailedly and systemically studied with colloid charge titration. On the research of flocculation mechanism the laser sizer was also first time used to determine the floc size. Results showed that sodium silicate was treated and acidification was carried out by means of strongly acid cation exchange resins and obtained almost sodium free acid sols. The acid sol obtained after acidification was then made alkaline.     

大学生高校创业教育问题的思考

创业教育是一个新的教育理论研究和实践领域,1989年底召开的“面向21世纪教育国际研讨会”正式提出了“创业教育”(Enterprise Education)的概念。近年来,随着国际竞争的加剧,历史文化的变迁,人们对创业的认识和观念发生了新的变化,创业