摘要
通过室内模拟试验研究了运河 (杭州段 )沉积物污染引起的上覆水 CO DCr的变化 ,并研究了连续曝气、换水清洗的方法对其耗氧物质释放的影响。结果发现由于沉积物的释放使得上覆水 CODCr浓度维持在劣四类水以上。连续曝气可以降低水体的恶臭 ,但由于曝气对沉积物的扰动引起沉积物更多地再悬浮 ,上覆水 CODC r也没有明显降低。在不考虑外源影响的情况下 ,换水清洗可以将上覆水 CODCr浓度降到 30 m g· L-1以下。本研究说明运河 (杭州段 )沉积物内源释放对上覆水 CODCr有较大的影响。
Release of oxygen\|depletion materials (denoted with chemical oxygen demand, COD Cr ) from the sediments of the Hangzhou section of the Grand Canal has been studied. It showed that COD Cr content of overlying water was higher than the limitation value of the Fourth Grade of surface water quality standard. Continuous aeration abated odor of overlying water, but has not significantly decreased COD Cr concentration of it. Overlying water refreshment may decreased COD Cr concentrations lower than 30 mg\5L\+\{-1\}, regardless external loading. This study indicated that internal release maybe the major factor affecting water quality of the Hangzhou section of the Grand Canal.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2002年第4期232-235,共4页
Environmental Pollution & Control
