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Home  >  Volume 46 (May, 2018)

28. PREDICTION OF FIVE-DAY BIOCHEMICAL OXYGEN DEMAND (BOD5 ) FROM SOME POLLUTION PARAMETERS IN POULTRY AND BREWERY WASTEWATERS. by Uwidia, Ita Erebho Volume 46 (May, 2018 Issue), pp217 –226
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PREDICTION OF FIVE-DAY BIOCHEMICAL OXYGEN DEMAND (BOD5 ) FROM SOME POLLUTION PARAMETERS IN POULTRY AND BREWERY WASTEWATERS.

Uwidia, Ita Erebho

Department of Chemistry, University of Benin, Benin City Nigeria

Abstract

The five-day biochemical oxygen demand (BOD5) is a principal pollution indicator used by monitoring agencies for proof of compliance with environmental standards in monitoring and management of wastewater discharges. In this research, poultry and brewery wastewaters were characterized for some pollution potentials. Results obtained were used to relate BOD5 with some pollution parameters such as total suspended solids (TSS), permanganate value (PV) and chemical oxygen demand (COD) present in these wastewaters using correlation and regression analysis. The aim was to attempt to predict BOD5 from these measures of contamination (i.e. TSS, PV, and COD) which are also oxygen dependent and readily determinable for quick and effective wastewater monitoring. Significant relationships were obtained from the analysis. Results obtained from the linear regression equations and coefficient of correlations were: TSS/BOD5 (y = 1.093x + 30.58; r = 0.984), BOD5 / TSS (y = 0.885x – 17.45; r = 0.984), PV/BOD5(y = 0.9777x + 54.7; r = 0.983), BOD5 /PV(y = 0.9876x – 43.22; r = 0.983), BOD5 / COD(y = 1.4753x + 26.12; r = 0.982), COD/BOD5 (y = 0.6532x – 3.91; r = 0.982) for the poultry wastewater. Also for the brewery wastewater relationships obtained were: TSS/BOD5 (y = 0.921x + 31.00; r = 0.934), BOD5 / TSS(y = 0.9477x + 24.00; r = 0.934), PV/BOD5(y = 1.0499x + 44.45; r = 0.934), BOD5 /PV(y = 0.83x + 8.77; r = 0.934), BOD5/ COD(y = 1.5635x+28.52; r = 0.980),COD/ BOD5(y = 0.6145x – 1.1045; r = 0.980) respectively. Confidence intervals (CI) for the relationships established for the linear regressions of BOD5 on TSS, BOD5 on PV, and BOD on COD were: BOD5 on TSS = 1.02 ≤ a ≤ 1.17 at 95% and 0.99 ≤ a ≤ 1.20 at 99%, BOD5 on PV = 0.85 ≤ a ≤ 2.81 at 95% and 1.62 ≤ a ≤ 3.65 at 99%, COD on BOD5 = 1.40 ≤ a ≤ 1.55 at 95% and 1.36 ≤ a ≤ 1.59 at 99% for the poultry wastewater. Also for the brewery wastewater, confidence intervals were: BOD5 on TSS = 0.86 ≤ a ≤ 0.98 at 95% and 0.83 ≤ a ≤ 1.01 at 99% , BOD5 on PV = 0.94 ≤ a ≤ 1.16 at 95% and 0.89 ≤ a ≤ 1.21 at 99%, and COD on BOD5 =  1.51 ≤ a ≤ 1.62 at 95% and 1.48 ≤ a ≤ 1.65 at 99% respectively.The functional relationship found to exist between BOD5 and the three parameters (TSS, PV and COD) were expressed by the following equations: (i) BOD5= 1.09 TSS + 30.58 (ii) BOD5 = 0.98 PV + 54.70 and (iii) COD = 1.48 BOD5 + 26.12 for the poultry wastewater ; (i) BOD5 = 0.92 TSS + 31.00 (ii) BOD5 = 1.05 PV + 44.45 and (iii) COD = 1.56 BOD5 + 23.28 respectively for the brewery wastewater. Results obtained show that BOD5 can be predicted from TSS, PV, and COD, in both wastewaters. The study will be useful for effective monitoring and wastewater analysis as it will facilitate effluent assessment for management decision.  

Keywords: Prediction, BOD5, pollution parameters, TSS, PV, COD, correlation, regression analysis, poultry wastewater, brewery wastewater.

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