水厂铝盐污泥为除磷填料的雨水径流污染控制技术

针对金泽水源地雨水径流磷污染控制需求,以及现有雨水处理技术中传统填料对溶解性磷的去除率有待进一步提高的问题,开发出以给水厂污泥为基材的除磷颗粒,并通过低浓度、短时间、少用量的盐酸浸泡改性强化了除磷效果.当使用改性除磷颗粒作为主体填料,构建雨水源头处理的生态滞留池或末端处理的滤池时,过滤装置具有表面水力负荷高、出水磷浓度...     

城市大型给水工程系统迁建设计

在环保督察背景下,城市饮用水水源保护问题凸显。以铜陵为例,介绍城市大型取水口、对应水厂系统迁建设计案例。铜陵市三水厂横港取水口水源保护区内存在多座码头,结合铜陵市长江岸线规划、现状供水布局及存在问题,将横港取水口、三水厂整体迁建至下游新民取水口附近,设计规模为30万m^3/d,同步建设配套给水管道,将原三水厂改造为加压泵站,工程建成后逐步关停现状一、二水厂,形成更加科学合理的供水系统。     

Identifying the factors affecting the willingness to pay for fuel-efficient vehicles in Turkey: A case of hybrids

This paper aims to determine the factors that have an impact on the consumers’ willingness to pay a premium for hybrid automobiles in Turkey. A web-based random survey was conducted in different regions of Turkey. A questionnaire was administered to 1983 participants in January–March of 2009. The questionnaire was prepared by taking the issues raised in various sources into account. An ordered Probit model was used to meet the objective. Results show that variables such as income, gender, education, concerns about global warming, number of automobiles, importance of automobile performance, risk preference, attitude toward the alternative energy sources have an impact on the consumers’ willingness to pay a premium for hybrids. Findings suggest that consumers who have high income, higher educational level, and concerns about the global warming are more likely to pay a premium for hybrids. This study is expected to make important contributions to the current literature related to the consumers’ willingness to pay for hybrids by providing a research study from a developing country’s perspective. Results of this study also make important contributions to the policy and decision makers, environmental groups and automotive industry.     

基于支付能力和支付意愿的农民灌溉水价承受能力研究

从支付能力和支付意愿的角度,分别应用扩展线性支出系统(ELES)模型和条件价值评估法(CVM),提出了农民灌溉水价支付能力和支付意愿的定量方法,研究农民灌溉水价承受能力.以江苏省五岸灌区为例,通过问卷调查,计算分析了农民灌溉水价的支付能力、支付意愿、综合承受能力和水价调整空间等.研究表明:部分贫困农户支付能力有限,是重点考虑的对象,以人均纯收入为指标的分类定价策略值得考虑;不同支付能力农民的支付意愿无显著性差异,支付意愿对水价改革具有重要意义.     

全通径偏心半球阀在水厂的应用及成效

送水泵房作为将清水加压输送至给水管网的构筑物,其出水水流具有高流速、高压力等特点。送水泵房水泵机组根据水厂调度需要,需经常进行启停水泵操作,因此,送水泵房止回阀需具有防水锤功能稳定、水损小、密封性好、密封副不易磨损、操控简易等特点。现状各水厂送水泵房止回阀多选用多功能水泵控制阀、液控双速闸阀。多功能水泵控制阀存在水损大、缓闭功能易受膜片老化受损影响等缺点;而液控双速闸阀组成结构复杂,阀门老化后存在启闭不到位、密封不严实、维护工作多等缺点。针对传统止回阀在应用过程中的不足,某水厂在进行送水泵房止回阀更换时,选用全通径偏心半球阀替代传统止回阀,全通径偏心半球阀由阀体及液控驱动系统两部分组成,通过液压驱动油缸动作,控制阀门启闭。通过设置液控驱动系统的动作模式,可分快速和慢速两阶段启闭阀门,实现缓闭、止回等多种功能,而全通径偏心半球阀的偏心结构设置,以及阀座、密封副的优化设计,使其在使用过程中更加稳定。与多功能水泵控制阀与双速闸阀相比,全通径偏心半球阀具有更安全、更可靠、更经济、更智能的特点,应用于泵后止回时更具优势。该水厂在使用全通径偏心半球阀后,阀前压力降低4.33%,水头损失降低90.8...     

自来水厂生产废水处理工艺流程的优化及运行控制要求

对自来水厂生产废水处理的工艺流程进行了优化，并对工艺的组成及其运行控制要求进行了较为详细的分析。     

Does value matters in playing online game? An empirical study among massively multiplayer online role-playing games (MMORPGs)

A few study examined the impact of value and aspects of behavioral intention in virtual environment. The aim of this study is to examine the impact of emotional value (VE), social value (VS), price-value for money (VP), performance-quality value (VQ) and repurchase intention (RI), willingness to pay a premium price (WTP) and word of mouth (WOM) among massively multiplayer online role-playing games (MMORPGs). A total of 228 valid questionnaires were collected from cybercafé customers in Klang Valley-Malaysia. Structural equation modeling (SEM) was employed using partial least squares (PLS) analysis to assess measurement and structural model for reflective construct. Our result reveals that there is a positive relationship between VP and RI, VQ and RI while there is no positive relationship between VE and RI, VS and RI. VE, VP and VQ value positively impact WOM but VS does not. VE and VP have positive while VQ and VS did not explain WTP. This study contributes to literature on the new phenomena of online game and is considered as few studies in examining value in Second Life setting. The practical and social implications of study are discussed along with research limitation and implication.     

水厂沉淀池改造方法与应用分析

针对传统沉淀工艺在水厂运行中存在的问题,通过总结沉淀池改造成功案例,得出改造方案。完善进水区以降低进水流速,提高布水均匀性;通过延长排泥车行程等方式改造排泥系统以解决"跑矾"现象;针对不同的水质问题,可考虑平流-斜管组合池、浮沉池、水平管沉淀技术等来提高水处理效果。通过进水口、排泥系统以及沉淀池型3方面改造可有效提高沉淀池进水稳定性,解决排泥不畅的问题,增强对低温低浊水以及含藻水的适应性。在未来,沉淀池改造仍应以进水口、排泥系统以及沉淀池型3方面改造为主,并适当借鉴国外的高效沉淀技术,以提高对原水的处理效果。     

某水厂改扩建工程集约化设计方案

为应对供水格局变化和水量增长,通过系统方案论证,提出拆除水厂内已停运的一期工程,新建15万m^3/d常规处理和30万m^3/d排泥水处理设施。结合一期工程拆除后的地形条件进行平面布置,降低工程投资。本期充分考虑远期深度处理系统,提前建设预臭氧接触池,滤池设置双层渠道和切换阀门,减少远期建设对水厂生产的影响。水厂建(构)筑物采用组合、叠合设计,节约用地,可供类似改扩建工程设计参考。     

基于LCA理论的环境影响社会支付意愿研究

为了明确各类环境影响的权重,基于生命周期评价（LCA）和支付意愿（WTP）理论,探讨并建立了用社会支付意愿来衡量环境影响程度的环境影响评价模型和权重确定方法,赋予了环境影响评价的经济涵义．在环境税相关理论基础之上,以北京地区为例,综合考虑污染物影响能力以及年排放总量,建立了可实用的区域环境影响评价模型,并得到了各类环境影响因素的具体权重值．考察了3种型号水泥的环境影响的社会支付意愿．