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《Techniques and Equipment for Environmental Pollution Control》 2003-02
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Kinetics of pollutants release from sediments

Zhang Liping Yuan Wenquan Zhang Xihui (Research Center for Environmental Engineering & Management, Shenzhen Graduate School, Tsinghua University, Shenzhen 518057)  
With laboratory test and a new microbial measurement method, this paper investigated sediments oxygen demand (SOD) rate and kinetics of pollutants release from sediments of both paludal lake and polluted river under different disturbance conditions. The results showed that: (1) SOD rate is 48 times of that of overlying water under the same condition, and 596-936 times when disturbed. Polluted sediments have higher SOD rates and larger impacts on water body. (2) Nitrogen and phosphorus release rates are greater when sediments were disturbed. The release of nitrogen is affected by amination, nitrification, denitrification and microorganism assimilation of ammonia nitrogen, while the phosphorus release is affected by anaerobic condition and adsorption of sediment particles. The sediments with higher SOD rates have greater phosphorus release potential. (3) Microbial amount plays a key role in kinetics of pollutants release from sediments. The new method can measure microorganism amount rapidly. These results are of significant importance to water management, polluted water restoration, sediment management and disposal.
【CateGory Index】: X132
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