• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >High water content sludge dewatering via freeze-thaw.
【24h】

High water content sludge dewatering via freeze-thaw.

机译：高含水量污泥通过冻融脱水。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sludge management is a major technical issue at both water and wastewater treatment facilities. Typically, process sludges contain 90 to 99% water. In most cases, direct disposal of these very dilute sludges is unacceptable because of the cost of transportation of the water. Commonly used sludge dewatering methods include filter presses, horizontal belt filters, centrifugation, vacuum filtration, drying beds and lagoons. Treatment of large volumes of sludge in cold regions, selection of an effective and economical year round dewatering method can be especially challenging.;The freeze-thaw method was studied to dewater the sludge without chemical addition. Sludges from three different sources with solids content ranging from 2.2 to 37.0% were tested. The samples were frozen under controlled temperature boundary conditions using constant temperature baths. Drainage test was performed for both the freeze-thaw conditioned sludge and never frozen sludge. Based on these test results, the improvement of dewaterability of the sludge after freeze-thaw was examined. Rapid volume separation (70 to 90%) occurred in the first hour of the drainage test for the freeze-thaw conditioned sludge. This improvement in dewatering rate is effective on all sludges. The released filtrate was also collected and tested. Its quality is sludge specific and normally can not be discharged directly into the receiving environmental.;Canada is a northern nation where cold climate is experienced by most locations. The water and wastewater treatment facilities in these areas can take advantage of the cold climate to assist in dewatering sludges by the freeze-thaw method. A sludge dewatering model called the freezing bed is reviewed, the study shows that freeze-thaw is a simple, efficient, and economic method for sludge dewatering within the cold regions.
机译：污泥管理是水和废水处理设施中的主要技术问题。通常，过程污泥包含90％至99％的水。在大多数情况下，由于水的运输成本，直接处理这些非常稀的污泥是不可接受的。常用的污泥脱水方法包括压滤机，卧式带式过滤机，离心，真空过滤，干燥床和泻湖。在寒冷地区处理大量污泥，选择一种有效，经济的全年脱水方法可能尤其具有挑战性。研究了冻融法在不添加化学物质的情况下对污泥进行脱水。测试了来自三种不同来源的固体含量为2.2％至37.0％的污泥。使用恒温浴在受控的温度边界条件下冷冻样品。对冻融条件下的污泥和从未冻结的污泥都进行了排水测试。基于这些测试结果，研究了冻融后污泥的脱水性的改善。在冻融条件下的污泥的排水测试的第一个小时内，体积快速分离（70％至90％）发生了。脱水速率的提高对所有污泥均有效。还收集并测试了释放的滤液。它的质量取决于污泥，通常不能直接排放到接收环境中；加拿大是一个北方国家，大多数地区都经历寒冷气候。这些地区的水和废水处理设施可以利用寒冷的气候，通过冻融法帮助污泥脱水。回顾了一种称为冷冻床的污泥脱水模型，研究表明，冻融是在寒冷地区进行污泥脱水的一种简单，有效且经济的方法。

著录项

  • 作者

    Mao, Songqin.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Sanitary and Municipal.
  • 学位 M.Sc.
  • 年度 1997
  • 页码 171 p.
  • 总页数 171
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号