Effects of Acetic Acid from Fermented Excess Sludge of Biogas Processes and Alkalinity from Pig Manure to Phosphorus Removal
Keywords:
Acetic acid, Fermented excess sludge of biogas, PhosphorusAbstract
The aim of this project was to determinate the phosphorus removal (P) in an enhanced biological phosphorus removal system. The process used acetic acid and alkalinity from fermented excess sludge of biogas processes (FES) and pig manure (PM), respectively. This study varied 3 types of wastewater. Type 1 and 2 were designed with source of acetic acid from the ratio of CH3COONa: FES in 4.33: 1 and 1.50: 1, respectively and alkalinity of type 2 was controlled with PM. Type 3 had source of acetic acid from only FES and the alkalinity was controlled by adding PM and NaHCO3. The processes were conducted in 60 days SRT. The COD removal of all types was higher than 99%. On the other hand, TKN removal in type 1 and 3 were higher than 95%. However, TKN removal of type 2 was found to be the lowest (79.02%). The Low TKN removal in type 2 is suspected due to the low proportion of COD: TN (10.63: 1) which resulting insufficient amount of organic carbon to remove TKN. Ortho-P removal was 61.34%, 51.17% and 55.68% in Type 1, 2, and 3, respectively. Therefore, Type 3 is expected to remove P effectively. The result showed the possibility to occupy low cost source of both alkalinity and acetic acid sources
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