基于虚拟现实的城市供水管网仿真系统

建立虚拟城市供水管网运行仿真系统,在三维场景中模拟城市供水管网运行工况,有明确的工程意义。首先建立供水管网工程数据库,以保证仿真模型具有较高的精度。进而利用MultiGen Creator构建供水管网阀门、管段等部件三维模型,建立城市供水管网三维模型。最后采用Vega驱动三维模型,通过VC++ MFC程序设计及EPANET工具箱实现运行工况视景仿真。基于虚拟现实的城市供水管网仿真系统可直观显示城市供水管网信息,实现对供水管网拓扑结构及各种运行工况的仿真。该系统克服传统地理信息系统的局限性,并且具有较高准确性和可靠性。     

电絮凝技术处理高盐废水的研究进展

由于高盐对微生物有一定的抑制作用,采用常规生化方法处理高盐废水较难达到处理需求,电絮凝技术因具有去除污染物效率高、操作简单和占地面积小等优点,逐渐受到研究者的关注。将电絮凝技术应用到高盐废水中,可利用废水的高盐度特性,降低电絮凝所需的电量消耗,从而在较低能耗下达到废水处理的目的。因此,电絮凝在高盐废水中的研究与应用逐渐增多。本文主要介绍了电絮凝技术的基本原理和优缺点,以海水养殖废水、垃圾渗滤液和印染废水的电絮凝处理为例论述了该技术在高盐废水中的研究进展,并对今后的发展进行了展望。     

纤维素乙醇废水生化出水色度物质的降解特征

针对玉米秸秆纤维素乙醇废水生化出水高色度的特征,采用电化学氧化方法对纤维素乙醇废水生化出水进行脱色研究,对比分析纤维素乙醇废水生化出水和标准腐殖酸溶液的降解规律,结合三维荧光光谱技术分析二者随电化学氧化降解过程中的有机物组成变化.结果表明:纤维素乙醇废水生化出水色度的去除与腐殖酸质量浓度的减少呈明显的正相关,纤维素乙醇废水生化出水和标准腐殖酸溶液的电化学降解规律呈明显的正相关.纤维素乙醇废水生化出水中类腐殖酸物质荧光峰的消失与标准腐殖酸溶液的变化相近,可以用腐殖酸质量浓度的减少表征纤维素乙醇废水中的色度物质的降解.     

Inactivation of Giardia by Ozone and Its Disinfect Mechanisms

This study was to investigate the effect of ozone(O3)inactivation on Giardia in water by the fluorescence staining method.In order to elucidate the dominant mechanisms of inactivation,cell surface or inner cell components damage were comparatively examined by scanning electron microscopy(SEM).Results suggested that O3had a stronger effect on inactivating capability.Firstly,when the concentration of O3was above 2.0 mg/L and the contact time was up to 5 min,it showed a significant inactivating effect.Secondly,the effect of turbidity on inactivation was also found to be significant in synthetic water;when turbidity increased,the inactivating effect decreased.Thirdly,the inactivating rates were improved with a temperature increase from 5 to 25℃,but decreased when the temperature were out of this range.The inactivating capability of O3was stronger under acidic conditions than alkalic conditions.Lastly,when the concentration of organic matter in the reactive system was increased,probably due to the competition between Giardia and organics on O3,the inactivating rate was decreased;in addition,the cellular morphology of Giardia varied with different contact times.At contact time of 30 s,cells were rotundity and sphericity;at 60 s they became folded,underwent emboly,and burst;and at 240 s,the cell membrane of Giardia shrinked and collapsed completely.