Studying the effect of the sludge retention time on the co-digestion of domestic wastewater and organic solid waste using anaerobic membrane bioreactor
Keywords:
Anaerobic membrane bioreactor (AnMBR), Anaerobic co-digestion, Organic solid waste, Domestic wastewater, Biogas productionAbstract
This study assesses the effect of sludge retention time for treatment efficiency on the codigestion domestic wastewater and organic solid waste using an anaerobic membrane bioreactor. In the operating conditions: average pH value from 7.1 to 7.2, the ratio of VFAs/Alk <0.4 and the temperature in the Mesophilic range. The results show that the COD treatment capacity at 90-day and 120-day SRT, reaching over 80% (85% and 84 percent, respectively), at 30-day and 60-day SRT, for lower COD removal efficiency, reaching over 75% (78% and 79% respectively). In addition, the biogas production of 30 days, 60 days, 90 days and 120 days SRT have an average value of 3.35 ± 0.21 L/day, 3, 34 ± 0.24 L/day, 3.87 ± 0.21 L/day and 3.77 ± 0.20 L/day. The measured methane flow corresponding to the retention times have an average value of 2.09 ± 0.13 L/day (62%), 2.21 ± 0.17 L/day (66%) ), 2.52 ± 0.16 L/day (65%) and 2.46 ± 0.12 L/day (65%). Thereby, the average value of methane accounts about 64% of the biogas composition.
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