珠江广州河段员村段的底泥耗氧

探讨广州珠江员村段底泥的耗氧特点及总底泥耗氧中生物耗氧和非耗氧所占比例。结果表明，在实验期间内平水期底泥只出现前６ｈ的持续耗氧过程，而丰水期泥除出现前６ｈ的快速耗氧外，还表现出相对较缓慢的耗氧过程。两水期底泥耗氧中化学耗氧起主导作用。同温、同流量条件下，平水期的底泥耗氧速率略低于丰水期。由实验推导出两水期底泥耗氧速率与温度及流量之间的关系为：ＳＯＤ丰＝０．４９４５×１．００５８＾（Ｔ－２０）（Ｔ≤

Sediment Oxygen Demand in the Yuancun Reach of the Pearl River in Guangzhou

The physical properties, characteristics of oxygen demand, proportions of chemical oxidation and biological respiration in the total oxygen demand of sediments from the Yuancun Reach of the Pearl River in Guangzhou, were studied in laboratory during mean water and high water seasons. Results indicate that the sediment only consumed oxygen initially over the first six hours in mean water season, while in high water season,.the sediment continuoeusly consumed oxygen at a comparatively low rate. It is doubt less that chemical oxygen demand plays a main role in toeal oxygen demand in both hydrological seasons. At the same temperature and water flow rate, the rate of sediment oxygen uptake in high water season is significantly higer than that in mean water season. In addition, the rates of sediment oxygen demand are related to the temperature and flow rate and their equations are:SOD_M=0.4945×1.0058^(T-20), SOD_H= 0.6155×1.0234^(T-20), SOD_M=0.1623×1.0912, SOD_H=0.2393×1.0857.