Assessment Of Bod, Cod As Organic Pollution Indicator...

ASSESSMENT OF BOD, COD AS ORGANIC POLLUTION INDICATOR LEVELS OF VARHALA LAKE ABSTRACT Lakes are of great importance both from the natural and economic point of view. Lake water is a source of drinking and domestic water supply for people living in and around the area. The present study was conducted to assess the organic pollution indicators like BOD, COD and DO. The sampling of water was based on human and aquatic activities around the lake. Water from five sampling stations of Varhala Lake was monitored for seasonal variations from May 2011 to April 2012. The BOD was positively correlated with COD of 0.609, as both are the products of oxidation. The correlation between DO and BOD, gave a negative relationship of 0.517 between two variables. Keywords: Water quality monitoring; pollution indicators; Varhala Lake INTRODUCTION Most of our water resources are gradually becoming polluted due to the addition of foreign materials from the surroundings. Rapid urbanization and industrialization has put a lot of pressure on the existing water bodies (Waziri et al., 2009; Sawant and Telave, 2009). Anthropogenic development and changes around lakes affects their ecosystems (Mouri, G et al 2011). Lakes have a complex and fragile ecosystem, as they do not have a self-cleaning ability and therefore readily accumulate pollutants (Abida et al 2008; J.C Akan et al 2012). Continuous water quality monitoring is essential for efficient management of lakes and for control of pollution. It is