综合调水前后苏州河下游水体耗氧特性比较

Comparison of Deoxygenation Characteristics ofSuzhou Creek before and after IntegratedLow-flow Augmentation Project

对综合调水前后的苏州河(北新泾下游)水体耗氧特性进行了定性与定量比较。结果表明,综合调水工程全面实施后,苏州河下游水体的还原性物质耗氧阶段消失,单位水体耗氧量大幅度下降,但难降解有机物阶段的耗氧量仍较高。耗氧动力学模拟计算表明,CBOD耗氧一级反应动力学速率常数(K)在综合调水前后变化不大,而硝化耗氧Logistic动力学速率常数(KN-log)则明显提高。

The different deoxygenation of the lower reaches of Suzhou Creek (below Beixinjing Area) before and after integrated low-flow augmentation has been compared quantitatively and qualitatively in this paper. The comparison results showed that, after integrated low-flow augmentation, the total consumption of dissolved oxygen per unit volume reduced substantially in the lower reaches of Suzhou Creek with the deoxygenation stage of reducing materials disap- pearing. But the consumption of dissolved oxygen of non-degradable organic pollutants and sludge digestion was still large. The calculating results of the deoxygenation kinetics model showed that the deoxygenation rate of CBOD (k) in first order kinetics did not vary after the project, while the deoxygenation rate of NBOD (KN-log) in Sigmoide kinetics model increased by an order of magnitudes.