A dynamic contaminant fate model of organic compound: A case study of Nitrobenzene pollution in Songhua River, China

A one-dimensional dynamic contaminant fate model, coupling kinematic wave flow option with advection–dispersion-reaction equation, has been applied to predict Nitrobenzene pollution emergency in Songhua River, China that occurred on November 13, 2005. The model includes kinetic processes including volatilization, photolysis and biodegradation, and diffusive mass exchange between water column and sediment layer as a function of particles settling and resuspension. Four kinds of quantitative statistical tests, namely Nash–Sutcliffe efficiency, percent bias, ratio of root-mean-square to the standard deviation of monitoring data and Theil’s inequality coefficient, are adopted to evaluate model performance. The results generally show that the modeled and detected concentrations exhibit good consistency. Flow velocity in the river is most sensitive parameter to Nitrobenzene concentration in water column based on sensitivity analysis of input parameters. It indicates flow velocity has important impact on both distribution and variance of contaminant concentration. The model performs satisfactory for prediction of organic pollutant fate in Songhua River, with the ability to supply necessary information for pollution event control and early warning, which could be applied to similar long natural rivers.

Description: A dynamic contaminant fate model is used to simulate how can organic contaminant in natural river be downstream transported and degraded.Figure optionsDownload as PowerPoint slideHighlights
► A dynamic contaminant fate model of organic pollutant in river was developed.
► The model links kinematic wave option with advection–dispersion-reaction equation.
► The model was used to predict the fate and transport of organic pollutant in river.
► The model was applied in Nitrobenzene pollution emergency in Songhua River, China.