共查询到20条相似文献,搜索用时 140 毫秒
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经过混凝实验、生产对比试验,研究了滤池反冲洗水不经过污泥系统处理直接回流对净水生产工艺的影响,通过测定水中浊度、余氯、COD_(Mn)、TOC、藻类及氯仿的变化情况,得出对于水处理工艺而言,在原水浊度较低的情况下,一定比例的反冲洗水回流,不会对处理效果带来显著影响,在一定程度上还有积极作用。 相似文献
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在目前部分单水反冲洗滤池滤料含泥量增长较快的情况下,实验分析在成都市自来水公司的原水条件下煤砂双层滤料和石英砂单层滤料的过滤性能和反冲洗性能,结果表明,在试验条件下煤砂双层滤料的过滤去除浊度和耗氯类污染物的能力优于单层石英砂滤料;单水反冲洗,两种滤料均冲洗不够彻底,含泥量增长较快。初步实验了表面辅助冲洗对单层石英砂滤床的冲洗效果,结果表明,增加表面辅助冲洗可以有效的控制滤料含泥量的快速增长,并对过滤性能有一定提高。 相似文献
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通过对梅林水厂和国内外现有处理污水方案比较,确定了梅林水厂净水工艺的优化设计方案;通过对原水pH值的调整,简化了PAC前馈投药数学模型,采用模拟沉淀池出水浊度作为投药控制的反馈信号,缩短了常规的用沉淀池出水浊度作为反馈信号而产生的滞后时间;用滤层水头损失和滤池出水浊度作为滤池反冲洗控制信号,比定时反冲洗提高了一个档次;根据沉淀池排放的污泥具有浓度高的特点,提高了用结团凝聚法处理污泥的泥处理工艺。 相似文献
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低浊原水,杂质颗粒少,难以凝聚。回收滤池反冲洗废水后,与原水混合,增加水中的颗粒数目,可改善常温低浊低碱度原水的处理难度,同时增加经济效益。 相似文献
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针对原水低浊、上水量波动等问题,采用增设混合器强化絮凝、切割排泥管改善排泥、增设出水花墙加强整流、加装反冲总阀稳定反冲状态、增设空压机提高反冲强度等措施,充分利用水厂现有构筑物,提高净水能力,稳定出水水质,保障城市安全供水. 相似文献
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为了保证饮用水水质并实现节能降耗,宁夏宁东水厂采用调节原水pH值,投加高锰酸钾的方式来强化常规处理工艺。结果表明,调节pH值对于处理偏碱性的低温低浊水具有良好的净化效果。当原水pH值调节为中性时,混凝效果达到最优;适当使用聚丙烯酰胺可以优化混凝效果,但由于聚丙烯酰胺具有毒性,在实际运行中要慎重使用;高锰酸钾预氧化可有效提高低温低浊水的处理效果,对于提高冬季低温低浊水处理效果具有重要影响;通过滤池反冲洗水回流的方法.可以提高原水中颗粒物的数量.有助于提高水处理过程中颗粒碰撞效率,改善混凝效果。 相似文献
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Impact of recycling filter backwash water on organic removal in coagulation-sedimentation processes 总被引:1,自引:0,他引:1
The overall purpose of this research was to examine the impacts of filter backwash water (FBWW) and membrane backwash water (MBWW) recycles on water quality in coagulation-sedimentation processes. Specifically, the impact of recycling 5 or 10% by volume of FBWW and MBWW with surface water on the removal of natural organic matter (NOM) was evaluated at bench-scale using a standard jar-test apparatus and measurement of specific water quality parameters including total organic carbon (TOC), dissolved organic carbon (DOC), UV254, turbidity, total aluminum and zeta potential. The results of jar test conducted on a source water with a specific UV absorbance (SUVA) value within the range of 2-4 mg/L m showed a significantly higher removal of DOC from the raw water that was blended with 5 and 10% by volume of FBWW as compared to control trials where backwash water was not added. Increasing rates of MBWW that did not contain destabilized hydroxide precipitates did not significantly change DOC concentrations in the settled water samples as compared to the control trials. For source waters that are characterized as having low turbidity with medium SUVA values, these results could hold particular significance for plants that have reached treatment ceilings in terms of dissolved NOM removal using conventional coagulation designs. 相似文献
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为提高超滤膜系统的产水率,采用混凝/粉末活性炭/浸入式膜组合工艺,对中试超滤膜反洗水进行了回收处理。结果表明,膜反洗水中的有机物浓度较高,以DOC表征的有机物主要分布在MW30 ku和MW1 ku区间内;回收系统的平均出水浊度为0.07 NTU;当FeCl3和PAC的投量均为15 mg/L时,出水CODMn平均为2.81 mg/L,平均去除率达到了50.7%;回收系统出水的pH和微生物指标均满足《生活饮用水卫生标准》(GB 5749—2006)的要求。将该反洗水回收工艺应用于杨柳青水厂的膜处理示范工程,可使系统的产水率从79.85%提高到98.03%,可减少废水排放量达33×104m3/a。 相似文献
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福州西区水厂将原有的双阀滤池改造为V型滤池,重点介绍了进水系统、滤板系统、反冲洗排水系统、滤后水系统、反冲洗系统的改造。实践表明,改造后滤后水平均浊度<0.3NTU,反冲洗耗水量<2%,滤池实现了全自动化运行。 相似文献
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Backwash procedures for deep bed filters were evaluated and compared by means of a new integrated approach based on productivity. For this, different backwash procedures were experimentally evaluated by using a pilot plant for direct filtration. A standard backwash mode as applied in practice served as a reference and effluent turbidity was used as the criterion for filter run termination. The backwash water volumes needed, duration of the filter-to-waste period, time out of operation, total volume discharged and filter run-time were determined and used to calculate average filtration velocity and average productivity. 相似文献