Combined nitrification/denitrification in a membrane reactor

An ever stricter legislation regulating wastewater leads to an increasing demand for biological treatment plants which are able to selectively eliminate nitrogen from wastewaters with a high influent concentration, even when operating in partial influent mode. A membrane-tube-module (MSM) reactor (Membran-Schlauch-Modul-Reaktor) was constructed and realized in the IUV at the University of Bremen. The present approach makes use of all the various layers of the whole biofilm, enabling nitrification and denitrification processes to run simultaneously in one and the same biofilm under optimized conditions. The biological degradation capacity of the system was first successfully tested with synthetic wastewater, and subsequently in a real application with effluents from a recycling of animal carcasses plant and from a coke-oven plant. A mathematical model was devised which describes this biofilm system. The resulting equations were solved by means of the simulation software AQUASIM.     

锡槽工程钢结构安装施工工艺

锡槽是浮法玻璃生产线的关键设备之一，它主要是由钢结构组对安装而成，安装质量好坏关系到玻璃生产的质量好坏，因此针对钢结构组装部件多、组件复杂，且安装精工控制难的特点，经两条生产线的施工实践，本钢结构安装施工工艺做到了安装程序准确，精度控制措施得当，保证了锡槽的安装质量，有较大的实用意义。     

三轴深层搅拌桩止水帷幕在某基坑支护工程的应用

文章以某大楼基坑支护工程为例,主要介绍了三轴深层搅拌桩的施工工艺及质量保证措施,供类似工程参考。     

杂环类食用香料的合成及防火措施

随着人们对化妆品的需求日趋普遍,相应的对香料工业特别是调和香料的生产提出了新的要求。介绍了生产杂环类合成香料的工艺流程,分析了各生产环节的火灾危险性,并给出相应的安全防火措施。     

混凝-微滤组合工艺处理饮用水的中试研究

采用处理能力为300m^3／d的混凝-微滤组合工艺处理饮用水。连续监测了系统的处理效果及膜污染特性。结果表明，该系统具有良好的处理效果，出水水质满足《生活饮用水卫生标准》（GB5749-2006）的要求。系统运行期间，跨膜压差及膜比通量仅有较小程度的下降，排泥周期由24h变为48h，对膜污染和出水水质均未产生显著影响。     

对浙江省沿海城镇规划 "高起点"问题的探讨 --以台州市路桥区为例

本文以台州市路桥区为例,探讨浙扛省沿海地区城镇规划的"高起点"问题.改革开放以来,随着乡镇工业和个私企业的迅速发展,城镇数量快速增长,规模不断扩大,规划的"高起点"成为关注的焦点,高起点的内涵不同时期各不相同:80年代,城镇规划的高起点是"变大";90年代是"既变大又变高";21世纪将是"适宜的人居环境,良好的生态保护,延承历史文脉和有山水风貌特色的城镇".     

Upgrading the Activated-Sludge Process for Total Nitrogen Removal in Hong Kong

In order to protect the sensitive waters in Tolo harbour (Hong Kong), Sha Tin and Tai Po sewage-treatment works were first designed to remove 70% of the nitrogen load from the sewage. Since then, due to continuing serious eutrophication problems in the harbour, both plants have been modified to increase the removal efficiency to 90%.
The modifications were based on the Bardenpho process. However, the designers of the two plants adopted different approaches to process intensity, complexity and control of bacterial foam. At Sha Tin, the average monthly results have shown an increase of total nitrogen removal from 60–70% to about 80% since its completion. The addition of methanol was found to be ineffective on further enhancement of the denitrification rate due to difficulties in the apportioning of the second anoxic zone. The overall monthly results for Tai Po have also shown an increase in the removal rate to about 80%, even though 90% was achieved for a short period of time. The major problem encountered at the latter plant was that the process design did not provide an effective control on bacterial foaming, which had affected the smooth operation of the process.     

磨损随机过程建模及实例分析

针对磨损过程的动态性和随机性,提出一种构件磨损随机过程建模方法,为磨损构件的可靠性分析和寿命预测提供基础。基于平稳随机过程,给出了磨损随机过程建模基本流程;以Ar-chard磨损公式为例,推导了任意时刻磨损量的分布函数,从而能够评估磨损构件的动态可靠度和概率失效时间;结合活塞气环的实测数据,建立磨损随机过程模型,并给出抗磨损可靠度随行驶里程的变化规律。通过算例发现,磨损随机过程模型与实际相符,而考虑稳态磨损过程的磨损率为随机变量,计算结果偏保守。这样,为工程构件磨损的定量评估探索新的途径。     

农村及偏远地区饮用水除氟研究

研究了农村及偏远地区地下饮用水的除氟方法及其工艺流程、发展中的除氟新方法及新材料;分析了现有饮用水除氟设施存在的问题及其原因;提出了适合于农村及偏远郊区的除氟方法及其设施的发展方向.     

某超贫钒钛磁铁矿选矿试验研究

对某超贫钒钛磁铁矿开展了选矿试验研究,在工艺矿物学研究的基础之上,采用预选和再磨弱磁选工艺,获得了铁精矿铁品位58.32%,回收率60.76%的试验指标。