[Water quality model and its application in polluted river remediation by aeration]

Aeration is a main method to remediate polluted river water. Based on Shanghai Xingang River's aeration remediation, theoretical polluted water quality model was built. At the same time, parameters identification and solution were defined. Compared with observation values, the results from the model showed that: the dissolved oxygen had an average relative error of 11.38%, of which the relative error less than 20% accounted for 83.3%; BOD, had an average relative error of 9.16%, of which the relative error less than 20% accounted for 91.7%; ammonia had an average relative error of 11.15%, of which the relative error less than 20% accounted for 91.7%. With the exception of the individual points, most of the values from this model had relative error less than 20%. This model could describe well Xingang River's water quality under aeration conditions. Aeration intensity, velocity, sediment suspension and temperature simulation were analyzed by this model, which provides theoretical calculation methods and the basis for engineering design and operation of polluted river aeration remediation.