Screening Test of Fe2O3, ZnO and CuO Metal Oxide towards the Formation of Total Volatile Acids in the Anaerobic Degradation Process of Artificial POME
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anaerobic digestion, metal oxide, palm oil mill effluent (POME), volatile fatty acids
Abstract
This study investigated the effect of the addition of metal oxides (Fe₂O₃, ZnO, CuO) as a micronutrient on the formation of total volatile acids (VFAs) and biomass growth in the anaerobic degradation process of artificial waste characterized by Palm Oil Mill Effluent (POME). The biomass used in this research were obtained from POME WWTP sludge and septic tank. Using a circulating bed reactor (CBR) with a variation of the addition of a single metal oxide, as well as a combination of two and three metal oxides in between. The results of the screening test by 2ⁿ factorial method and ANOVA statistical tests (α = 5% and α = 1%) showed that the metal oxides that are significant towards VFAs production are Fe₂O₃ + ZnO & ZnO + CuO. The metal oxides that are significant towards organic compounds removal (sCOD) production are Fe₂O₃ & Fe₂O₃ + ZnO. Meanwhile, the statistical tests validates that there are no combinations of metal oxides that are significantly affecting microbial growth (VSS).
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