Enhancing digestion efficiency of POME in anaerobic sequencing batch reactor with ozonation pretreatment and cycle time reduction

Anaerobic Treatment of Palm Oil Mill Effluent in Pilot-Scale Anaerobic EGSB Reactor

“…Their maximum COD solubilization (82.63%) occurred under the optimum conditions, that is, 32.5°C and 8.83 g/L of NaOH for 41.23 h reaction time. Chaiprapat and Laklam [ 31 ] investigated the preozonated POME which not only improved COD removal but also obtained a more stable performance without pH adjustment of anaerobic process. COD removal efficiency of 88.56% of the present study implied that recirculation of the SS prolonged “hydraulic retention time” of SS which improved total COD removal at the same HRT.…”

Biogas production by anaerobic digestion of wastewater from palm oil mill industry

“…Qp, accumulated methane volume and % VS removal for the different ISR studied. The pH is one of the most important parameters in the methane production process, because microorganisms are pH-dependent in order to correctly develop its metabolic activity (Chaiprapat & Laklam, 2011). It can be observed -in Figure 4-the pH evolution at different ISR in the experiments using both inoculums.…”

“…In the literature it was found that there is a linear relationship between methane yield and the ISR (Chen et al, 2008;Chaiprapat & Laklam, 2011). Recent studies on the effect of ISR on AD of algae have demonstrated that methane yield decreased from 0.140 m 3 CH 4 /kg VS to 0.094 m 3 CH 4 /kg VS when the ISR was decreased from 2 to 0.5 (Dinsdale, Premier & Hawkes, 2000).…”

Evaluation of the biogas productivity potential of maize waste using ruminal fluid and pig manure

“…. VFA and pH plays an important role in the AD process; methanogenic microorganisms are susceptible to variations in pH [2,15], and this parameter is associated with the occurrence of acidification phenomena. Figure 4b, shows the VFA measuring during the monitoring period; taking into account that acidogenesis and hydrolysis occurs simultaneously, the high rate production and consumption of TRS during the first six days, and is reflected in the high VFA production during the same period, contributing to the development of the subsequent stages in the AD process.…”