...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Designing hypolimnetic aeration and oxygenation systems - A review
【24h】

Designing hypolimnetic aeration and oxygenation systems - A review

机译：设计低通气曝气和充氧系统-综述

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

When properly designed, hypolimnetic aeration and oxygenation systems can replenish dissolved oxygen in water bodies while preserving stratification. The three primary devices are the airlift aerator, Speece Cone, and bubble-plume diffuser. In each device, gas bubbles in contact with water facilitate interfacial transfer of oxygen, nitrogen, and other soluble gases. However, early design procedures for airlift aerators were empirical, while most bubble-plume models did not account for stratification or gas transfer. Using fundamental principles, a discrete-bubble model was first developed to predict plume dynamics and gas transfer for a circular bubble-plume diffuser. The discrete-bubble approach has subsequently been validated using oxygen transfer tests in a large vertical tank and applied successfully at full-scale to an airlift aerator as well as to both circular and linear bubble-plume diffusers. The performance of each of the four completely different full-scale systems (on a scale of 10 m or more) was predicted based on the behavior of individual bubbles (on a scale of about 1 mm). The combined results suggest that the models can be used with some confidence to predict system performance based on applied air or oxygen flow rate, initial bubble size, and, in the case of bubble plume diffusers, near-field boundary conditions. The discrete-bubble approach has also been extended to the Speece Cone, but the model has not yet been validated due to a lack of suitable data. The unified suite of models, all based on simple discrete-bubble dynamics, represents the current state-of-the-art for designing systems to add oxygen to stratified lakes and reservoirs.
机译：如果设计合理，则低通气曝气和充氧系统可以补充水体中的溶解氧，同时保持分层。三个主要设备是空运充气机，Speece锥和气泡-泡沫扩散器。在每个设备中，与水接触的气泡促进氧气，氮气和其他可溶性气体的界面转移。然而，空运充气机的早期设计程序是经验性的，而大多数气泡-泡沫模型并未考虑分层或气体转移。利用基本原理，首先开发了离散气泡模型来预测圆形气泡-泡沫扩散器的羽流动力学和气体传输。离散气泡法随后已在大型立式储罐中使用氧气转移测试进行了验证，并成功地全面应用于空运曝气机以及圆形和线性气泡-泡沫扩散器。根据单个气泡的行为（大约1毫米），预测了四个完全不同的满刻度系统（10 m或更大）中每个系统的性能。合并的结果表明，可以基于所应用的空气或氧气流速，初始气泡大小，以及在气泡羽流扩散器的情况下，基于近场边界条件，可以放心地使用这些模型来预测系统性能。离散气泡方法也已扩展到Speece锥体，但是由于缺乏合适的数据，该模型尚未得到验证。统一的模型套件全部基于简单的离散气泡动力学，代表了当前设计系统的最新技术，该系统可向分层的湖泊和水库中添加氧气。

著录项

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