Effect of Temporal Variation in Chemical Composition on Methane Yields of Rendering Plant Wastewater

The effect of temporal variation in chemical composition on methane yields rendering plant wastewater was studied batch experiments at 37 °C. In total, 14 grab samples were collected from Monday through Friday (Day 1 to 5) a located Queensland, Australia. Each day, three collected: early morning (S1), midday (S2) and afternoon (S3). Chemical analyses showed that significant different total solids (TS), volatile (VS), oxygen demand (COD) noticed among the samples. TS content ranged 0.13% 1.82% w/w, while VS between 0.11% 1.44% w/w. Among samples, S2 Day 3 had highest COD concentration (10.5 g/L) whilst S1 lowest (3.75 fatty acid (VFA) (149.1 mg/L). all acetic dominant VFA accounted for more than 65–90% VFAs. Biochemical potential studies yield 270.2 L CH4/kgCODadded obtained S3 3. Whilst (83.7 CH4/kgCODadded). Results kinetic modelling modified Grompetz model best fit first order large experimental modelled data. Time delay 2.51 3.84 d hydrolysis constant values close 0.21 d−1. Thus, study incoming feed biogas varies throughout week is dependent organic materials received amount steam used process.