不同中水回用模式的技术经济分析

根据国内外中水回用的工程实践，总结了目前城市中水回用的典型处理工艺、回用途径，提出了城市中水回用的7种模式，从技术经济角度分别对这几种模式进行了分析，提出了适合我国国情的城市中水回用模式，展望了我国中水回用的发展趋势。     

现场总线通讯不稳定因素的分析

以PROFIBUS总线为例，总结了影响现场总线通讯稳定性的诸多因素，指出应对产品、设计、施工、维护等各环节严格把关，杜绝不稳定因素的出现，以实现总线系统长期可靠地运行。     

Profibus-DP无线传输技术的工业应用研究

在Profibus-DP的无线应用中,一般采用网关法实现Profibus协议与无线通信协议之间的转换。为了解决网关转换延时较长的缺陷,提出采用无线中继法实现Profibus-DP主、从站之间的无线通信。实验结果证实了该方法既能满足Profibus-DP总线的时序要求,又能满足从站实时反应的要求。     

LNG空温式气化器管束传热特性

液化天然气（LNG）空温式气化器由翅片管管束组成,以节能环保的优势在LNG中小型气化站得到广泛应用。空温式气化器管束中的单根翅片管传热会受到相邻翅片管的影响,与大空间中的单根翅片管的传热过程存在差异,传统的传热设计中往往忽略管束中翅片管的传热差异,带来较大误差。针对空温式气化器管束传热特性展开研究,对涉及流固耦合传热问题的翅片管管束进行整场建模与求解,采用混合物模型和Lee模型求解管内LNG气化传热,得到了管束中不同位置翅片管的空气侧温度场分布及传热系数,建立了空气侧传热差异系数拟合公式,并用管束空气侧传热特性实验对拟合公式进行了验证。     

静电除菌技术在污水再生处理中的应用

在某再生水回用工程中,以污水厂二沉池出水为进水,采用了混凝沉淀-静电除菌处理技术,出水细菌总数<100+/mL、大肠菌群<3个/L、SS<0.5 mg/L、浊度<1 NTU、SDI<3,稳定达到<城市污水再生利用城市杂用水水质>(GB/T 18920-2002).出水回用作冲厕、绿化、景观及车辆冲洗用水.     

New formulation and optimization methods for water sensor placement

Optimal sensor placement for detecting contamination events in water distribution systems is a well explored problem in water distribution systems security. We study herein the problem of sensor placement in water networks to minimize the consumption of contaminated water prior to contamination detection. For any sensor placement, the average consumption of contaminated water prior to event detection amongst all simulated events is employed as the sensing performance metric. A branch and bound sensor placement algorithm is proposed based on greedy heuristics and convex relaxation. Compared to the state of the art results of the battle of the water sensor networks (BWSN) study, the proposed methodology demonstrated a significant performance enhancement, in particular by applying greedy heuristics to repeated sampling of random subsets of events.     

Assessing multiscale visual appearance characteristics of neighbourhoods using geographically weighted principal component analysis in Shenzhen,China

The neighbourhood is a basic residential unit and is characterized by its physical setting, functional attributes and visual appearance. The visual appearance of a neighbourhood can directly affect the impression of humans regarding the local living environment. Assessing the characteristics of the visual appearance of a neighbourhood is significance for promoting people's physical activities, improving residents' sense of comfort and even ensuring the equality of facilities. However, studies assessing the spatial characteristics of visual appearance are still limited. Therefore, this article applies street view images to quantify the visual appearance of neighbourhoods at multiple scales in Shenzhen, China. Then, geographically weighted principal component analysis (GWPCA) is employed to explore the varying multivariate structures of visual appearance. The results confirm that GWPCA can be effective in assessing the visual appearance characteristics of neighbourhoods while considering spatial heterogeneity. The visual appearance characteristics of neighbourhoods are sensitive to both the spatial location and analysis scale. The extracted geographically weighted principal components (GWPCs) can represent the original screen elements by emphasizing certain comprehensive concepts, such as walkability, accessibility and vibrancy. The exploratory findings of this article allow for an improvement of studies on spatial quality at the human scale and could potentially guide neighbourhood planning and street design.     

提高城市污水再生水水质的研究

提出了以厌氧－－好氧活性污泥法进行二级处理，以气浮充氧－－好气滤池进行深度净化的城市污水再生全流程。其特点是：生化反应池污泥不膨胀，操作方便运行稳定，深度净化中物化与生化作用相结合不但能有效地去除悬浮颗粒，而且能进一步去除溶解性有机物。该流程大幅度地提高了再生水质，与传统流程相比，深度净化水质改善率ＣＯＤＣｒ、ＢＯＤ５为１０－３０％，ＳＳ、色度为２０％，大肠菌值为９０％。     

浓缩液回灌对垃圾填埋体水位及稳定性的影响

成都长安填埋场渗滤液反渗透处理工艺日产260 t浓缩液,拟在填埋场进行回灌处理,回灌工程实施前需评估回灌工程对垃圾填埋体稳定性的影响.在该填埋场工程地质与水文地质勘查结果的基础上,利用GMS软件开展了垃圾填埋体非饱和一饱和三维渗流分析,模拟和预测了浓缩液回灌前后填埋体内渗滤液水位变化.基于渗流分析结果,利用Slope/W软件分析了浓缩液回灌对垃圾填埋体稳定性的影响,并提出回灌工程安全稳定控制措施.分析表明,现状水位条件下垃圾填埋体恰能满足稳定安全控制要求,现状水位线即为安全控制水位;若直接实施浓缩液回灌,全场渗滤液水位明显上升,垃圾填埋体稳定安全系数明显降低,不能满足稳定安全控制要求;如果预先将全场水位降低3 m后再实施回灌,回灌后水位低于现状水位,满足稳定安全控制要求.在该填埋场布设45口抽排竖井,预计实施渗滤液抽排3个月后可将全场水位降低3 m,满足浓缩液回灌工程稳定安全控制要求.     

天津港某污水处理池的抗震分析

利用ANSYS有限元分析软件,对天津港某在建污水池进行了地震作用下的有限元分析,得到其受力分布,并给出了震害评估,以弥补目前污水池在抗震验算方法中存在的不足,为工程中现行的设计方案提供支持,提出调整建议,也为以后相关问题的研究提供参考．