An Analysis of the Main Pollution Source of Sewage River in North China

Taking the main pollution source of sewage river in north China as study object, concentrations of ammonia, chemical oxygen demand and heavy metals in sources of pollution and nearby water are determined. The two dimension steady river water quality models of ammonia and chemical oxygen demand are established, and the geometric characteristics of pollutant zone at downstream of the pollution source are obtained. Concentrations of total metals and metal fractions in sediment and soil samples are also determined. The relative enrichment factors are taken to study the pollution status of heavy metals in sediment and soil nearby the pollution source. The results show that the polllution level is more serious in sediment than that in soil. Zn, Cu and Cd are more enriched while Pb, Cr and Ni are less enriched. The potential harm caused by the mainly enriched metals is as follows: Cd ≫ Zn ≫ Cu.