排序方式: 共有56条查询结果,搜索用时 33 毫秒
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多沙河流中的水厂取水口,枯水期经常存在淤沙,影响抽水。以往的治理方法多是采用丁坝群束水冲沙,但坝田淤高有碍行洪,对城市防洪不利.南区水厂采用潜坝方案,兼顾防洪.通航等要求,缩小治理范围,用十分简易的方法获得成功,且投资更省,值得在类似工程中推广运用. 相似文献
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The requirement for higher quality drinking water necessitates the application of more efficient water treatment techniques. Nanofiltration is one promising option for enhanced water treatment, for example, in enhanced organic matter removal. The characteristics of different nanofiltration membranes vary remarkably, and the selection of a membrane has to be made according to the requirements of an application. In this study six nanofiltration membranes (NF70, NF255, NTR-7450, NTR-7410, Desal-5 and TFC-S) were evaluated in improving the quality of chemically pre-treated surface water in a pilot-scale process. The results indicate that the membrane with high organics removal and slightly reduced ion removal characteristics (NF255) performed best in terms of product water quality as well as membrane productivity and fouling. The most permeable membrane (NTR-7410) suffered intensive fouling and insufficient product water quality. An interesting finding was that the permeates of all the tested membranes possessed a significant potential for microbial growth, despite the low nutrient contents. 相似文献
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Sandra Fleischer Stefan C. Weiss Thomas Lucke Wolfram Seitz Wolfgang Schulz Walter H. Weber 《臭氧:科学与工程》2015,37(5):441-449
Although oxamic acid has been identified as an ozone oxidation product from several precursor compounds, concentrations for drinking water have not been published previously. This study shows results from a full-scale drinking water treatment plant, noting that the mean concentrations for oxamic acid reached 21.3 μg/L after ozonation and prior to filtration. Subsequent multiple-layer filtration removed 85% of oxamic acid on average, and mean concentrations in drinking water were 2 μg/L. Up to 5.9% of the oxamic acid found in ozone-treated groundwater may be formed from Chloridazon metabolites. 相似文献
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无锡市充山水厂原采用常规处理工艺,由于太湖水源水污染,特别是有机物、氨氮和藻类污染日趋严重,使出厂水水质安全性难以得到保障.因此在中试基础上对充山水厂进行了技术改造,改造后新工艺为:BIOSMEDI生物滤池-气浮池-臭氧接触池-生物活性炭过滤器-石英砂过滤器,并将消毒剂由原来的氯改为ClO2.改造后的运行结果表明,出厂水水质完全达到《城市供水水质标准》(CJ/T 206-2005).改造工程设计规模1万m3/d,总投资1 500万元,水厂运行费0.86元/m3,较原常规处理增加0.17元/m3. 相似文献
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Kyoung Suk Kim Byung Soo Oh Joon Wun Kang Deuk Mo Chung Woo Hyeun Cho Yon Kyu Choi 《臭氧:科学与工程》2005,27(1):69-79
To improve the quality of water supplied to the City of Seoul in Korea, a pilot-scale evaluation of how the conventional treatment process could be upgraded was conducted. Three candidate processes were evaluated and compared: a conventional process (consisting of coagulation, sedimentation, and rapid sand filtration) plus GAC (Train A); a conventional process plus ozone and GAC (Train B); and a process consisting of coagulation, sedimentation, intermediate ozone, sand filtration, and GAC (Train C). Treatment efficiency of the unit process and overall treatment trains were evaluated using several parameters such as turbidity, dissolved organic carbon (DOC), UV absorbance at 254 nm (UV254), specific ultraviolet absorbance (SUVA), micropollutants (pesticides, benzenes, and phenols), disinfection by-products (trihalomethanes (THMs), haloacetic acids (HAAs) and aldehydes), and total organic halogen (TOX). Results showed that ozone and/or GAC was effective for removing micropollutants and controlling chlorinated by-products such as THMs and HAAs. However, any synergistic effect of ozonation (adsorption and biodegradation) on GAC was observed due to the low concentration of aldehydes in raw and process water. 相似文献