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DOI : ,    Vol.22, No.5, 93 ~ 103, 2014
Title
A Study on Optimum Mixing Ratio for the Integrated Digestion of Organic Waste and Sewage Sludge Pretreated
변병수 Byoung Su Byun , 이준상 Jun Sng Lee , 배종훈 Jong Hun Bae , 송용호 Yonh Hyo Song , 전항배 Jun Hang Bae
Abstract
In this study, anaerobic co-digestion experiments for mixtures consisting of pre-treatment sewage sludge, food waste and livestock manure conducted to assess the methane yields and the volatile solids (VS) removal rates. simplex centroid design(SCD) was employed to design the mixing rate of organic wastes for the anaerobic co-digestion. presents the results of ANOVA conducted to assess the models of the cumulative methane yield and VS removal rates. The p-values verified the suitability of the model, where the model shows significance since the null hypothesis proves wrong if the p-value is less than 0.05. Three models-the linear, quadratic, and special cubic models-were considered. The p-values of the linear model were 0.012 (for cumulative methane yield) and 0.05 (for VS removal rate), which were both. From the regression analysis, co-digestion with sewage sludge, food waste, and livestock manure resulted a good synergy effect for accumulated methane production and VS decomposition rate. It was observed that incidence rate of sewage sludge was 61.7% and higher the mixing ratio of sewage sludge brought the better result. The optimal mixing ratio of sewage sludge, food waste, and livestock manure was found to be 61.3%, 28.6%, 10.1% as respectively.
Key Words
Sewage sludge, Food wastewater, Livestock manure, Anaerobic co-digestion, Simplex centroid design
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