00000ctm a22000004a 4500 UP-99796217607596440 Buklod 20230503092542.0 m |o d | ta 011001s1999 xx r |||| u|eng d (iLib)UPD-00000484791 DML eng DMLUC LG 995 1999 E653 N32 Nabatilan, Marilou Montevirgen Effect of pH and ammonium on lipid degradation in the anaerobic digestion of fish processing wastewater by Marilou Montevirgen Nabatilan. 1999. xiii, 92 leaves ill. Thesis (M.S. Environmental Engineering)--University of the Philippines Diliman. The effects of pH and ammonium on lipid degradation in the anaerobic digestion of fish processing wastewater were determined in batch experiments. These experiments were conducted at pH levels pH 4, pH 5, pH 6, pH 7 and pH 8. LCFA analysis performed at pH 4. Furthermore, it was shown that at pH 8, lipid acidification is limited by lipid hydrolysis. Thus, it shows that lipid hydrolysis is rate limiting at pH 8. No significant differences were observed on lipid degradation among pH treatment levels pH 6, pH 7, and pH 8. Studies on total COD conversions however, suggested that COD hydrolysis, COD acidification, and COD methanogenesis were optimal at pH 7. The treatment levels of ammonium (as NH4+-N = 0.0, 0.3, 0.6, 0.9 and 1.5 g/l) did not significantly affect lipid degradation, specifically, lipid acidification. Analysis of total COD conversions (hydrolyzed, acidified, and methanogenized) however, showed significant differences between ammonium levels 0-0.9 g/L and 1.5 g/L. Since the fish wastewater also contain proteins, this difference is considered an effect of protein degradation. Protein degradation (specifically protein acidification) is more susceptible to high ammonium concentration than lipid degradation. Fishery processing industries By-products Biodegradation. Ammonia Physiological effects. Thesis FI UP UPD DARCHIVES LG 995 1999 E653 N32 UPD DENG-II LG 995 1999 E653 N32 Thesis