共查询到18条相似文献,搜索用时 203 毫秒
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以异向流斜板沉淀池为研究对象,介绍了异向流斜板沉淀池特定颗粒沉速μ0的传统计算方法;在平流理想沉淀池理论基础上,提出了计算异向流斜板沉淀池特定颗粒沉速的新思路和方法. 相似文献
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《Planning》2014,(7)
本文介绍一种新型磁化斜板澄清器的工作原理、工艺组成以及技术特点等,该设备采用斜板沉淀和过滤技术相结合,通过药磁的作用,促使颗粒间互相吸引,凝聚成大颗粒物,进入斜板区加速沉淀,沉淀出水进入过滤区进一步处理,细小悬浮物进一步被拦截去除,其采用气水反洗技术。具有占地面积少、出水水质好、自动化程度高、易操作、投资省等优点,是一种具药磁、斜板沉淀和过滤一体化的新型水处理设备,具有广阔的应用前景。 相似文献
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V形斜板强化接触絮凝沉淀技术利用设备的流体上升流道截面差造成水流沿重力方向的速度差,使斜板沉淀单元内部形成一定厚度的具有自我更新能力的絮体动态悬浮层,同时通过增设的垂直板来增加絮体悬浮层厚度,实现强化接触絮凝、提高絮体沉淀分离性能的目的.中试结果表明,当斜板长为850 mm、斜板间距为25 mm、直板长为150 mm时,沉淀设备达到最佳性能;在处理水量超过设计负荷的20%时,设备仍运行效果良好.在水厂改造项目中,V形斜板沉淀设备的出水浊度稳定在0.4 NTU以下,低于原设备的出水浊度(1.63 NTU),同时节省了49%的投药量. 相似文献
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介绍了一种改进型逆向流斜板沉降器的设计原理,通过试验,与相同几何尺寸的传统型逆向流斜板沉降器的固液分离性能进行了比较。结果表明,在处理流量为0.2m^3/h和0.25m^3/h的正常水力负荷下,改进型斜板沉降器的整体出水浊度较传统型的分别低39.95%和47、52%,且其各出水分区的水质较传统型的均匀、稳定;在处理流量为0、35m^3/h的超常水力负荷下,传统型斜板沉降器不能正常运行,而改进型斜板沉降器可正常运行;在临界流量下,改进型斜板沉降器的表面负荷较传统型的高出28.13%。斜板沉降器的改进设计解决了其在工程应用中出现的排泥困难、出水水质不均匀、抗冲击负荷能力差等问题。 相似文献
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针对采石水厂网格反应斜管沉淀池运行效果不佳、出水浊度超标、矾耗较高等问题,对沉淀池进行了改造,包括扩大反应池反应区面积,将网格反应改为折板絮凝反应,更换沉淀池内斜管及支架并将原集水槽换成不锈钢材质,改变水流在竖井间的流动方向等.改造后的沉淀池出水水质明显提高,年平均药剂单耗从20 kg/103m3下降为10 kg/10... 相似文献
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介绍吉林市水务集团有限公司在水厂的扩建和改建过程中,采用紊流多微涡网格絮凝池与中小间距斜板沉淀池等新工艺,不仅提高供水水质,且节能降耗,取得明显的社会效益和经济效益。 相似文献
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《Urban Water Journal》2013,10(4):309-314
Circular sedimentation tanks are preferred for removal of inorganic solids by class-I sedimentation during water and wastewater treatment processes. The present design practice for obtaining the exit diameter of circular settling tanks is based on using an arbitrarily fixed overflow rate. Such practice does not consider the non-uniformity of sediment particles and the mechanics of suspension and settlement. Although the equations which describe sedimentation are available, design equations have not been attempted as yet. In this paper the design equations for a circular sedimentation tank have been formulated taking into account the non-uniformity of suspended particles. These equations are based on the desired removal efficiency and ensure that the deposited material is not resuspended. The design equations are dependent upon the fluid, flow and sediment characteristics, and enable the exit diameter and the flow depth of the settling tank to be calculated. 相似文献
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The effect of influent temperature variations in a sedimentation tank for potable water treatment--a computational fluid dynamics study 总被引:2,自引:0,他引:2
A computational fluid dynamics (CFD) model is used to assess the effect of influent temperature variation on solids settling in a sedimentation tank for potable water treatment. The model is based on the CFD code Fluent and exploits several specific aspects of the potable water application to derive a computational tool much more efficient than the corresponding tools employed to simulate primary and secondary wastewater settling tanks. The linearity of the particle conservation equations allows separate calculations for each particle size class, leading to the uncoupling of the CFD problem from a particular inlet particle size distribution. The usually unknown and difficult to be measured particle density is determined by matching the theoretical to the easily measured experimental total settling efficiency. The present model is adjusted against data from a real sedimentation tank and then it is used to assess the significance of influent temperature variation. It is found that a temperature difference of only 1 degrees C between influent and tank content is enough to induce a density current. When the influent temperature rises, the tank exhibits a rising buoyant plume that changes the direction of the main circular current. This process keeps the particles in suspension and leads to a higher effluent suspended solids concentration, thus, worse settling. As the warmer water keeps coming in, the temperature differential decreases, the current starts going back to its original position, and, thus, the suspended solids concentration decreases. 相似文献