Contribution of organic contaminations and nutrient level on dynamic equilibrium of dissolved oxygen in water bodies of costal belt of Ampara district

Abstract

The dissolved oxygen (DO) of a water body (WB) is dynamically equilibrated between the two films such as gas and liquid phases. Domestic and other related waste materials may alter this equilibrium as a result aquatic organism can suffocate. Therefore, an investigation is necessary to analyse the Contribution of Organic Contaminations and Nutrient level on its related WBs. The selected parameters such as chemical oxygen demand (COD), dissolved sulphide (DS), salinity, nutrient level, and DO were used to analysis above contribution. Randomly selected three different WBs namely Ninthavur (S1), Kalmunai (S2) and Sammanthurai (S3) were used for this study over a period of six month. The correlations studies were carried out among parameters and measured data were also utilized in estimating the oxygen transfer efficiency (OTE), Eh, α and β values. Contribution of domestic and other related waste materials on dynamic equilibrium of dissolved oxygen (DEDO) were studied based on the OTE, α and β values. The DO has negatively correlated with COD, DS and nutrient level and these implies a strong contribution of domestic and other related waste materials on the DEDO on these WBs. A poor negative correlation (r2< 0.5) was observed for DO with salinity and it has demonstrated that impact of salinity on DEDO is very less.