Evaluation of the capacity to receive wastewater of Dao river - Nam Đinh by modeling method

Abstract

Nam Dinh is a coastal province in the Red River Delta - where there are 04 major rivers supplying the main surface water of Nam Dinh province with abundant water resources but the water volume distributed between months of the year is uneven; on the other hand, as a coastal province, it is affected by climate change, saltwater intrusion in estuarine and coastal areas tends to increase. In addition, the current situation of water resources management in Nam Dinh province shows that wastewater mainly from Nam Dinh city, towns, industrial clusters and craft villages in 10 districts and cities flows into rivers, canals, infield and urban canals and then flows into 4 major rivers: Red River, Dao River, Day River and Ninh Co River. Furthermore, the collection and treatment system of wastewater from many industrial clusters, craft villages, and residential areas has not yet been established, which affects the management and use of water resources, as well as the water quality in the province. In the context of this study, the capacity to receive wastewater of Dao River in Nam Dinh is simulated by MIKE11-HD, MIKE11-AD and MIKE11-ECOLab models. The simulation results show that parameters BOD5, N-NH4+ and P-PO43- do not exceed QCVN08-MT:2015/BTNMT (column B1), the river water quality on Dao River is still in good condition, and the capacity to receive additional waste sources if the waste source is treated before being discharged into the environment.

Keywords: Dao River; MIKE model; water quality