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Effect of Disinfectants on Aerobic Sewage Degradation Using Dettol and Izal as Case Study

Agunwamba J C, Tenebe I T, and Emenike P C
Department of Civil Enginering, University of Nigeria, Nsuka, Enugu, Nigeria

Abstract—Disinfection is considered to be the primary mechanism for the inactivation/destruction of pathogenic organisms to prevent he spread of diseases and of which some of the organisms maybe neded for degradation as ocuring in septic tank. This work investigated the efects of disinfectants on aerobic sewage degradation using Detol and Izal as case study. Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Fecal coliform were used to determine the efectivenes of the two disinfectants. Sewage for analysis were colected from the University of Nigeria Nsuka treatment plant for laboratory analysis. Five 4 Litres containing sewage having diferent dose in ml of the two disinfectants (Detol and Izal) of 0.5, 1.0, 1.5, 2.0, and 2.5 with one control were established.Samples for analysis were obtained for 4 weks for each disinfectants having interval of 3 days. Short and Long term efects of the disinfectants were studied and the results were analyzed using Turkey-Kramer multiple comparison test. The patern of changes reflecting the efect of the respective disinfectants on faecal colony of coliform shows the patern for Izal is similar to that of Detol, regresion coeficient were the same. Maximum efects were observed at concentrations 1.5 ml for either Izal and Detol. Resistance of colony to higher concentration of disinfectant was observed with the respective disinfectants on prolonged study. Aditon of 1ml can be sen as the critcal dosage. The low COD values observed at 0.5 ml or 1 ml sugest he presence of high faecal colony, likely due to tolerance or inhibitory efects. Low BOD values were observed with aditon of 1 ml confirms that he dosage is the critcal dosage since it sugest hat lower biomas requirng oxygen for oxidation was present in the sample at his dosage. This is also reflected in the COD asesment. From comparism of the disinfectants efect shows usage of Izal recorded higher disinfectant efect compared to Detol. 

Index Terms—BOD, COD, sewage degradation, disinfection, fecal coliform, waste water

Cite: Agunwamba J C, Tenebe I T, and Emenike P C, "Effect of Disinfectants on Aerobic Sewage Degradation Using Dettol and Izal as Case Study," International Journal of Structural and Civil Engineering Research, Vol. 2, No. 4, pp. 184-194, November 2013.