摘要:本次设计为大同市给水工程设计，设计内容主要包括三部分，即取水工程设计、给水管网设计和净水厂设计。该净水厂处理工艺采用常规处理，即“混凝——沉淀——过滤——消毒”。
设计水厂建于城市的东北角，靠近城市和水源地。混凝包括混合和絮凝两部分。取水工程中采用地表水做水源，根据水位变化较大，水厂采用固定式取水构筑物。由于主流近岸，岸边有足够的水深，水质地质条件较好，所以选择岸边式取水构筑物。一泵站选取水泵250S24A型单级双吸离心泵四台，三用一备。混凝采用PAFC，计量泵投加，选三台AHC62计量泵，设计流量为108 L/h，两用一备，单台泵流量为Q=105L/h。溶液池分三个格，每格容积为13m3，两用一备交替使用。 溶解池分三格，每格容积为2.6m3，两用一备交替使用。设计尺寸：L×B×H=1.5m×1.5m×1.5m，包括超高0.3m。设计尺寸：L×B×H=2.4m×3m×2.1m，包括超高0.3m。絮凝池采用网格絮凝池，分为4组，絮凝池的有效水深3.6m池的总高H为4.4m，单个有效尺寸为1.39×1.39米。沉淀池采用斜管沉淀池，分2组，尺寸14×30m，为了配水均匀，进水区布置在30长的一侧。池子总高度H为4.67m，取5m。沉淀池进口采用穿孔墙，排泥采用穿孔管，集水系统采用穿孔管。滤池采用V型滤池，为2个双格滤池。反冲洗使用气水反冲洗，反冲洗水泵选择泵型号700HQB—50D，选六台，四用两备。选择DG型离心鼓风机，选用八台，六用两备。消毒使用液氯消毒，滤池有效工作时间T=24-24×0.2/48=23.9h，滤池高度3.9m。加氯量Q为3.831kg/h。采用加氯机投氯，本设计选用2J型-2转子加氯机两台，交替使用。清水池设为两座，每座的容积为1/2W=6500m3,尺寸采用40m×40m×4.5m。二泵站设计中，选四台350S125型泵，三台工作，一台备用，为调节用水不均匀性，其中一台水泵设置变频调速装置。采用连续式重力浓缩池，设计2座，每个浓缩池面积335.2m2，浓缩池总高度5.8m。取6m。
本给水工程设计能够缓解大同市用水需求，符合其经济、工业水平的不断发展要求，也有利于大同市的进一步发展要求。
关键词 管网平差；取水工程；净水厂设计
Abstract:The design of Datong water engineering, design mainly includes three parts, namely, water engineering, water supply network design and purification plant design. The net water treatment process using conventional processing, namely "coagulation - sedimentation - filtration - disinfection."
Design waterworks was built in the northeast corner of the city, close to the city and water sources. Coagulation and flocculation comprises mixing two parts. Surface water intake project used to do water, according to water level changes greater use of fixed water intake structures. As mainstream inshore, the shore there is sufficient water depth, water quality, good geological conditions, so select shore style intake structures. . Select a pumping station pumps 250S24A single-stage double suction centrifugal pump four, three and one standby. Coagulation using PAFC, metering pump dosing, the election of three AHC62 metering pump design flow of 108 L / h, Uses a single pump flow rate Q = 105L / h. Solution tank is divided into three cells, each cell volume of 13m3, Uses a used interchangeably. Dissolved pool is divided into three cells, each cell volume of 2.6m3, Uses a used interchangeably. Design dimensions: L × B × H = 1.5 × 1.5 × 1.5, including ultra 0.3m. Design dimensions: L × B × H = 2.4 × 3 × 2.1, including ultra 0.3m. Flocculation flocculation using a grid, divided into four groups, the effective depth of 3.6m flocculation tank total height H is 4.4m, single effective size of 1.39 × 1.39 meters Sedimentation tank using inclined tube sedimentation tank, divided into two groups, the size 14 × 30m, for uniform water distribution, water district arranged in 30 long side. Pond total height H is 4.67m, take 5m. Sedimentation tanks imported perforated walls, mud using perforated pipe, perforated pipe drainage system. Filter using V-filter for the two pairs of lattice filter. Using air and water backwash backwash backwash pump selection pump model 700HQB-50D, choose five, four and one standby. Select DG-type centrifugal blower, use eight units, six with two devices. Disinfection using chlorine disinfection, filter effective working time T = 24-24 × 0.2/48 = 23.9h, filter height 3.9m. Q is the amount of chlorine 3.831kg / h. Dosing of chlorine chlorination machine, the design uses 2J type -2 chlorinator two rotors, are used interchangeably. Set two pools, each block volume of 1/2 W = 6500m3, clear pool size using 40.0m × 40.0m × 4.5m. Two pumping station design, selected four 350S125-type pump, three work, a spare , to regulate the water inhomogeneity, which set up a pump frequency control devices. Using a continuous gravity thickener, design 2, each of the concentrated pool area 335.2m2, concentrated pool total height 5.8m. Take 6m.
The water supply project designed to ease the demand for water in Datong, in line with its economic, industrial level of the continuous development requirements, but also conducive to the further development of Datong requirements.
Keywords the intake works the water pipe network design the water treatment plant design
