Abstract
Qiantang River Estuary is a typical macro-tidal estuary in China, with features of strong tidal and high sediment concentration. In order to figure out degradation characterization of the major pollutants of Qiantang River estuary, water samples were taken in Xinsha Island, Changansha Island and Wenyan. CODMn, TN and NH3-N were chosen as the main pollutions of the three cross sections. Pollutants concentration were measured in the laboratory for 20 consecutive days. And the pollutant degradation coefficients (hereinafter referred to as PDCs) were calculated. Considering excluding the nonbiodegradable component in the shore run, pollutant concentration decreased rapidly, which was in keeping with the first-order kinetics equation. The PDC of CODMn is 0.376 d−1, which was above average when comparing with other rivers in China. The PDCs of NH3-N and TN were below average, which were 0.395 d−1, 0.066 d−1. Meanwhile, NH3-N and TN are main pollutants exceeding the standard in Qiantang River.
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