Reduction of pH Levels from Underdrain Outlets
| 项目名称： | Reduction of pH Levels from Underdrain Outlets |
| 摘要： | Effluent from some open graded underdrains has elevated pH and soluble minerals. Precipitate is found at under drain outlets. This sometimes enters the storm sewer system, which is considered an illicit discharge under Michigan Department of Transportation's (MDOT's) municipal separate storm sewer system (MS4) permit. MDOT has been monitoring water quality at about 10 locations throughout the state to confirm that this problem exists. The cause of the high pH and precipitate is believed, but not confirmed, to be from the fine dust contained in recycled crushed concrete used as a base material layer under the roadway. Perforated underdrain pipes are usually placed under the layer of crushed material to collect water and protecting the roadway from damaging saturation and freezing conditions. Better understanding the water chemistry that leads to elevated pH and precipitate and best practices to address the problem would help MDOT improve water quality from existing outlets and future construction. |
| 状态： | Active |
| 资助组织： | Michigan Department of Transportation |
| 执行机构： | Lawrence Technological University |
| 主要研究人员： | Bandara, Nishantha |
| 开始时间： | 20180501 |
| 预计完成日期： | 20201231 |
| 实际结束时间： | 0 |
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