我国城市化进程中的水资源环境问题

城市化进程中，城市水文循环和水环境物质代谢的失衡严重影响着城市水环境的量和质，使城市水资源环境问题日益突出。本文在对城市水文循环和水环境物质代谢分析的基础上，提出城市化过程中城市环境面临的挑战，最后简要提出了城市水资源环境问题解决的战略构思。     

Kinetics of Chlorine Decay in Water Distribution Systems

A combined first and second-order model, which includes bulk decay and wall decay, was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC), the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC, a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.     

谈书法、写字教学对师范专业学生的重要性

对于师范院校的学生来说写好"三笔字"是作为一名未来合格教师的基本功之一。本文从当前书法、写字教学的现状谈起,探讨书法、写字教学对师范专业学生的重要性。     

基于2个独立二项分布的风险比的信仰推断

两个独立二项分布参数之间的风险比的非劣效性检验在医学统计研究中是一个非常有意义的问题. 常用的限制性极大估计方法在大多数情况下都不能控制第一类错误. 本文提出用基于信仰推断法来解决基于两个独立二项分布参数之间的风险比的非劣效性检验问题. 模拟结果显示: 在小样本的研究情况下,这种基于信仰推断法的MF检验方法能很好地控制第一类错误, 检验功效也不差.     

余氯及五种有机氯化物对活性污泥毒性的研究

取某氯碱厂正常回流的活性污泥对余氯及五种有机氯化物进行急性生物毒性试验。本研究限于单种毒物,采用对照试验的方法,在小型活性污泥曝气桶中完成。通过检测对照桶和试验桶中化学需氧量(COD)、生化需氧量（BOD_5)的变化结合镜检结果,得出余氯及五种有机氯化物对活性污泥的最高允许浓度。     

畜禽养殖场环境污染现状及治理对策

系统地阐述了畜禽场环境污染概况及其治理现状。针对畜禽养殖场环境污染难治理的问题，引入清洁生产的思想，提出用清洁生产的途径来达到标本兼治的新思路，并进一步论述了实施清洁生产的具体措施和途径。     

臭氧活性炭、纳滤联用制取优质饮用水的中试研究--纳滤优化运行研究

以臭氧活性炭、纳滤联用制取优质饮用水时，纳滤的优化运行是整个工艺能否正常运行的关键所在。针对这一问题，研究了工艺中纳滤膜通量、回收率等重要参数特性，分析了纳滤膜污染和劣化因素及控制措施，为工程应用提供了依据。     

合成纤维和棉织物表面接触干燥特性的实验研究

采用合成纤维和棉织物作为实验样品，对纤维织物的表面接触干燥过程进行了实验研究，得到了在不同干燥温度下的纤维织物表面温度与干基含水率变化曲线，以及各织物随时间的失重情况对比数据。研究结果表明：在表面接触干燥过程中，织物温度将发生四个阶段的变化，分别为预热升温阶段、水分气化降温阶段、温度回升阶段和恒温阶段。不同种类织物各阶段时间长短有差异，织物中的水分干燥主要发生在降温干燥阶段，纤维织物表面干燥的临界含水率与加热器表面温度有关。     

T型氧化沟处理规模化猪场粪水厌氧出水的研究

研究了T型氧化沟工艺对猪场粪水厌氧出水处理。当HRT平均为18h，反硝化、硝化运行时间比tDN／tN为0．40时，处理出水的COD、BOD5、NH4^ -N和Ss均能达到《畜禽养殖业污染物排放标准》。在tDN／tN为0．17、0．27、0．40、0．47、0．56时，分别比较T型氧化沟对脱氮效果的影响。结果表明，当tDN／tN为0．40时，T型氧化沟对高氨氮的猪场粪水有较好的脱氮效果，此时系统达到硝化能力和反硝化潜能的最佳组合。但在试验中T型氧化沟对磷的去除效果不高。     

Analysis of Circumstance Influence Factors on HMBR for Waste-water Reclamation in Dwelling District

Circumstance influence factors on Hybrid Membrane Bio-Reactor (HMBR) process for the wastewater reclamation in dwelling district was analyzed. The main characteristic of this process is that sludge and nitrified effluent can be recycled automatically, which simplifies the operation of system and is beneficial to get the high removal of organics and nitrogen. Based on the analysis of circumstance influence factors, it is recommended that water temperature of about 20℃, influent pH of 6 -7 and DO of 1. 0 mg/L - 1. 5 mg/L in the aerobic compartment. Under these conditions, COD, BOD5, NH4+ -N, and TN were removed effectively in HMBR and the average removal efficiencies were 94.5%, 99.3%, 99.4% and 84.7%, respectively. SS and coliforms were both below the detection limits in the permeate of UF membrane module, and turbidity was less than 1NTU. The treated effluent meets the Miscellaneous Domestic Water Quality Standard (CJ25.1-89), and can be reused multipurposely such as watering of green belts, cleaning a