The Appropriate Biochemical Oxygen Demand Concentrationfor Designing Domestic Wastewater Treatment Plant

摘要

Majority of Wastewater treatment plants in Thailand faces the problem of over design, as this isbased on the Biochemical Oxygen Demand (BOD) content of the inputted wastewater having alower concentration than the efficiency of the design system. To meet the purpose of this study thefindings of the optimum recommended BOD concentration for the effectiveness of the treatmentand high operating costs. Water samples were collected from January 2009 to December 2017 (N= 90). The results showed that the BOD concentration differ shows an inconsistence variation overtime as this is due to the wide range of wastewater sources from various activities. The results ofthis paper showed that the recommended BOD concentration for the wastewater treatment plantshould be 80 mg/L in the vicinity of the city, while 60 mg/L is the recommended concentrationfor wastewater that has been transited for over 5 hours into the treatment plant system away fromthe city, as the transferring processes of the wastewater through the close pipeline resulted in ananaerobic treatment which reduces the BOD concentration. Thus, the overall concepts suggestedthat the BOD concentration entering the wastewater treatment plant of 80 and 60 mg/L respectivelyfalls under the 80% confident range.