Anaerobic digestion 1 Article 1 Energy yield 1 Organic loading rate 1 Specific methane production acclimatization 1 alkalinity 1 ammonia 1 biogas 1 chemical oxygen demand 1 color 1 controlled study 1 energy recovery 1 energy yield 1 flow rate 1 gas chromatography 1 grease 1 hydraulic retention time 1 lipid 1 long chain fatty acid 1 mass spectrometry 1 methane 1 methanogenesis 1 nitrogen 1 nonhuman 1 oil 1 pH 1 phosphorus 1 physical chemistry 1 polyvinylchloride 1