Resumen
This research was carried out to investigate the effect of ozonation to the COD fractionation of wastewater. Poultry processing industry produce large amounts of wastewater due to the slaughtering process and cleaning of their facilities. The non-biodegradable materials such as hormone presented in the poultry processing wastewater cannot be removed completely by conventional biological water treatment process. This may cause decrease in the biodegradability and solubility of the ultimate effluent. The objectives of this research were to evaluate the effect of ozonation on the solubility and biodegradability of processing industry wastewater as well as characterize the wastewater based on the COD fractionation. The wastewater was undergoing ozonation treatment for 5 to 25 min. The wastewater COD fractionation before and after the ozonation treatment was evaluated with the method modified from Jun Wu et al (2014) study. Next, the optimal operating parameters for ozonation treatment were determined with the aided of Response Surface Methodology (RSM) coupled with D-optimal method. The operating parameters in this research were wastewater pH, ozonation duration and dilution factor of wastewater COD fractionation. Based on the experiments, there was 30.37 % of total COD removal at 5 min ozonation and increase to 39.85 % total COD removal at 25 min ozonation. This is shown that ozonation treatment was able to reduce wastewater COD concentration as well as increase wastewater biodegradability and solubility. Next, the wastewater was able to fractionate into soluble biodegradable COD (SS), particulate biodegradable COD (XS), soluble non-biodegradable COD (SI) and particulate non-biodegradable COD (XI). The initial wastewater sample had 1420.5 mg/L total COD with 469.855 mg/L SS, 350.895 mg/L XS, 25.04 mg/L SI and 574.71 mg/L XI. The optimal operating parameters obtained for this research were the pH 8.4 wastewater with a COD fractionation dilution factor of 4.89 and 21 min of ozonation.