This article starts from the basic formula of hydraulics and calculates the replenishment capacity of building inlet pipes based on specific situations.It is proposed that under different municipal water supply pressure conditions,the replenishment capacity and outlet flow rate of the water tank replenishment pipe should be rechecked to avoid affecting the water supply of other water supply points.At the same time,corresponding design theoretical basis and suggestions were proposed by comparing the corresponding foreign technical standards.
A long-distance ultra-high-lift water conveyance project in the eastern mountainous area of Sichuan Province processes the characteristics of both ultra-high-pressure power flow water conveyance pipeline and ultra-high-gravity flow water conveyance pipeline.Moreover,the significant elevation difference at each water supply point increase the difficulty in water hammer protection design.To ensure the safety and reliability of water supply,this project conducted water hammer simulation analysis and adopted a series of water hammer protection measures.In addition,the problems existing in the trial operation of this project are analyzed and summarized to provide reference for the construction of other projects.
As the increasing demand for water,the sludge production of water supply plants also increases significantly.This article took a water supply plant in the north as an example to analyze the characteristics of sludge in the plant,conduct planting experiments,studied and explored the of sludge resourcilization.The results indicated that the heavy metal content in the sludge of the water supply plant was much lower than the pollutant control standard limits in green planting soil and form sludge.By using sludge from water supply plants,the legumes and peanuts had grown well with plump seeds.This article could provide reference for the utilization of sludge from water supply plants for soil improvement.
As one of the safety engineering of the lifeline of urban infrastructure,the existing tunnel pump stations in most cities have low standards,which cannot meet the requirements of drainage and waterlogging,and there are potential risks.This article took Lianchi South Street underground pump station as an example,analyzed the characteristics of the underground pump station and introduced the key points of transformation such as pump station scale,process design,and operation mode in the case of limited space.After the intensive transformation of the pump station,the drainage capacity had been significantly improved,and the addition of the initial rainwater storage tank could effectively cope with surface runoff pollution.
In order to improve the nitrogen and phosphorus removal efficiency of the traditional A2/O process,an improved A2/O process was adopted to explore the effects of different influencing factors on its nitrogen and phosphorus removal efficiency,and the optimal operating conditions of the improved A2/O process were determined.By adjusting the reflux ratio of digestive solution,inlet distribution ratio,and dissolved oxygen(DO)concentration,the optimal operating conditions for the improved A2/O process were determined to be 200%reflux ratio of digestive solution,6 ∶ 4 inlet distribution ratio,and 1.9～2.0 mg/L DO concentration.Under these operating conditions,the nitrogen and phosphorus removal effect was effectively improved,and the effluent water quality could stably reach the first level A discharge standard.
The scale of the project of Binhai Water Supply Plant is 8.0×104 m3/d.The water source is Yangtze River and Luanhe River,and the two water sources are switched in time according to seasonal changes.The water treatment adopts"pre-treatment + enhanced conventional treatment + advanced treatment processes",and the sludge treatment adopts"drainage and sludge discharge + sludge concentration + mechanical dehydration processes".The design was primarily based on the Luanhe River water source,optimizing the treatment process for adaptability and energy efficiency,and transforming multiple utility model patents.At the same time,the combination of high and low voltage motors was adopted according to local conditions to ensure water supply safety.The factory adopted a roof grid structure,laying the foundation for the next step of photovoltaic design,and reserving relevant interfaces for the smart water plant.After the completion of the project,the effluent meets the GB 5749-2022"Standards for drinking water quality".
2025 年深圳市要率先实现城市自来水直饮全覆盖,满足居民对高品质饮用水的需要,二次供水设施改造工程是深圳解决供水系统"最后一公里"水质安全及水压保障的关键环节.本文以SJG 79-2020《二次供水设施技术规程》为技术纲要,针对二次供水设施改造工程设计阶段的重难点,着重分析工程衔接、节能降耗、水质安全、噪音污染、智慧化泵房建设,为后续二次供水设施改造工程的设计提供参考.
本实验采用原子荧光法对市售食品添加剂氢氧化钠进行重复性及加标实验,分析该方法检测氢氧化钠中汞含量的精密度以及加标回收率,并通过标准样品的检测进行质量控制.结果显示,标准曲线呈现良好的线性相关性,线性相关系数达到0.999 9,样品重复测定相对标准偏差(RSD)为8.40%、7.56%,加标回收率在 97%～103%之间,标准样品的检测相对误差的绝对值小于1%.原子荧光法准确度高,操作性强,仪器自动进样,检测效率高,可以实现食品添加剂氢氧化钠中汞含量的快速准确分析.
A sewage treatment plant in Dezhou City mainly treats industrial wastewater and some residential sewage from an economic development zone.The main treatment process is"pre-treatment + AAO + mixed sedimentation phosphorus removal".This article analyzed the current process status and existing problems of the sewage treatment plant and conducted technical optimization and transformation on the basis of the original design.It addressed issues such as unreasonable design parameters of some individual units,aging equipment and facilities,which had led to limited water treatment capacity.On the premise of ensuring stable production and operation,the water treatment capacity of the sewage treatment plant had been increased by 28%.
In response to the problem of existing water information management platforms being unable to manage massive amounts of water information,Internet of Things(IoT)technology was introduced to carry out design research on campus smart water information management platforms.This paper built a basic framework for water management platform,reasonably selected hardware devices such as sensors,utilized IoT technology to achieve the transmission of water information data,and built a water information database.Through crisis management process design,it achieved visual display of water equipment management and water information.Through comparative experiments,it had been proven that the water management platform based on the IoT could achieve the management of massive water information data in practical applications,and the platform could run stably.
This article focused on the raw water from a specific southern reservoir,comparing and analyzing the water treatment efficiency of the pressurized dissolved air flotation process and the inclined tube sedimentation process.The evaluation was based on tracking and monitoring the effluent efficiency of both processes in treating raw water with low turbidity and high algae reservoir content.Results indicated that under the same dosage conditions,the pressurized DAF process exhibits higher average removal rates for indicators such as algae,turbidity,Mn,CODMn,ammonia nitrogen and other indicators by the pressure dissolved air flotation process were 92.96%,75.50%,75.81%,57.99%,and 76.29%,respectively.The removal rates of the inclined tube sedimentation process were 83.77%,56.28%,53.34%,36.02%,and 54.29%,respectively.The treatment efficiency of the pressure dissolved air flotation process for low turbidity and high algae reservoir raw water was significantly superior to that of the inclined tube sedimentation process.
Traditional methods have poor performance in real-time monitoring of pipeline burst status in urban water supply networks,resulting in large relative errors in monitoring results,long monitoring response time,thus failing to achieve the expected monitoring outcomes.A GIS based real-time monitoring method for pipeline burst status in urban water supply networks was proposed.This study utilized wireless sensors to collect the status data of water supply pipeline networks,extract pipeline burst status features,and identify pipeline burst status.GIS technology was utilized to establish a three-dimensional model of urban water supply pipeline networks,locate pipeline burst nodes,quantify the level of pipeline burst status,and provide corresponding early warning monitoring responses.Through experiments,it had been proven that the relative error of the monitoring results using the design method was less than 2%,and the response time was shorter than 2 seconds.It had good application prospects in real-time monitoring of pipeline burst status in urban water supply networks.
The safe utilization of recycled water is particularly important in the current situation of water scarcity.Tianjin,as one of China’s resource-based cities facing severe water shortage mandates.In order to improve the current situation of resource-based water shortage,Tianjin requires the use of recycled water for municipal water,and this has led to an increasing frequent direct or indirect contact between human and reclaimed water.Aiming at the reclaimed water designated for indoor flushing,which is most directly exposed to the population,this study conducted hydraulic simulation analysis on a residential community in Tianjin.It calculated and analyzed the optimal length of the blind pipe for entering the household to ensure the biological stability of the reclaimed water.The application of the research results will reduce the adverse impact of the biofilm on the water quality and enhance the effluent quality for end-users.
This study examined the management and protection of the Yangtze River Jiangpu water source area from four aspects:water quantity,water quality,organizational management,and emergency water source construction.Considering location of the water source area and the risk of sudden pollution sources,an analysis of the potential pollution risks of the water source area was conducted.Analysis showed that the Yangtze River and Jiangpu water sources could generally meet the requirements of long-term management and protection.The next step will improve management and protection levels from the perspectives of implementing safety assurance plans,improving management and protection mechanisms,and increasing publicity efforts,establishing a demonstrative model for long-term management and protection of water sources.
宿豫区某规划水厂设计规模 30×104 m3/d,拟定骆马湖为其主要水源,宿迁市在骆马湖有嶂山和宿城两处水源地.本文对骆马湖水量、水位及近年水质情况进行分析,通过两处水源地现状条件、施工难易程度及投资情况对比,选择宿城水源地进行取水.本文为国内相关城市的水资源配置及备用水源的选择及建设提供借鉴.
结合某项目能源站供冷供热工程的工艺条件进行电气设计方案分析,重点分析了电气设计过程中供电电源选择、电气主接线设计、站用电系统设计、电气用房布置的确定、高压电机启动方式选择、高压配电系统无功补偿方案等设计内容,对项目设计过程中的相关经验进行了总结,供同类工程设计参考.
本文基于可靠性评价指标涉及的水质、水压、停水等信息的收集汇总管理体系,依靠客服管理系统的数据统计分析功能,运用评价定义公式,计算可靠性数据.通过分级计算可靠性数据,可为上级管理部门的评价提供数据支撑,同时便于对企业内部不同区域的服务指标进行内部评价.
供水厂的安全运行对城市发展至关重要.为提高供水厂综合管理水平,某供水厂在"一流水厂"创建过程中,在安全、稳定、优质供水等方面做了大量的管理创新工作,实现了制水过程稳健性的提升.本文通过文献分析、问卷调查、实地访谈以及挖掘生产大数据等方法,深入分析了该供水厂运行管理中存在的典型问题,并从应急处突、设备维护、工序精准控制、能耗监控、水质检测以及物料管理等六个方面提出了相关优化对策,为提升供水厂运行管理能力和质量提供了有益参考.
生物负载量是影响生物接触氧化反应器污染物去除的重要因素.本文以工程实践中常用的悬挂式填料为研究对象,考察了不同悬挂式生物填料的生物负载量,并选取生物编带填料为试验对象,分析该生物填料对生物反应器处理生活污水的运行效果.结果表明:仿水草填料、螺旋填料、生物编带直线填料、生物编带毛圈填料单位质量填料生物负载量分别为 0.30、0.40、0.58、0.40 g/g,单位长度填料生物负载量分别为 0.73、11.34、12.64、14.86 g/m.当生物编带直线填料填充率为 33%时,生物反应器对 CODCr、TN、NH+4-N 的平均去除率分别为 73.2%、41.09%、90.16%,达到DB34/3527-2019《农村生活污水处理设施水污染物排放标准》的一级A标准,单位体积生物膜量为2 136.16 g/m3,镜检发现填料生物膜上生物相对丰富,先后出现了以细菌为食的原生动物到后生动物过渡的完整生物链.
