Water quality assessment using water quality index: a case of the Dong Nai river- sections flow through Bien Hoa city

Abstract

Over the past few years, there are many activities had negative impacts on the surface water of the Dong Nai river such as industry, agriculture, and service development activities; Therefore, river water quality is significantly relieved. This study was conducted to evaluate the effect of elements on the water quality in Bien Hoa City, Dong Nai Province. Analyze the parameters of pH, temperature, DO, BOD5, COD, N-NH4+, P-PO43-, TSS, turbidity, and total Coliform on 54 samples from Jan to Dec in 2022. The water quality index (WQI) and statistical analysis were applied to explore and determine the water quality in Bien Hoa City. The results of the study indicated that the water quality of Dong Nai river is not quite good, most parameters reach the limit value B1 according to QCVN 08:2015/BTNMT; however, the values of parameters DO, total coliforms, TSS exceed the limit value B1 significantly. WQI values fluctuate at a fairly high level from 17 to 68, and the average WQI of the river reaches is quite low, so the authority should have promulgated the law to protect the water surface of this river; Therefore, water quality assessment is significant for better control and management of the surface water environment in Vietnam.