Assessment of the effect of hydraulic retention time on the efficiency of waste treatment by co-digestion combined anaerobic membrane bioreactor through different reactor types
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https://doi.org/10.54939/1859-1043.j.mst.VITTEP.2022.159-166Keywords:
Anaerobic membrane bioreactor (AnMBR); Anaerobic co-digestion; Organic solid waste; Domestic wastewater; Biogas production.Abstract
This study evaluates the influence of hydraulic retention time on the efficiency of domestic waste treatment by co-digestion technology combined with anaerobic membrane bioreactor through different types of reactors: continuous stirred tank reactor (CSTR-AnMBR) and upflow anaerobic sludge blanket (UASB-AnMBR). In the operating conditions of 2 models with average pH values from 6.8 to 7.4, the temperature is in the Mesophilic range, and the mixing ratio of domestic wastewater and organic solid waste is 5g/L. Change the water retention time parameters including 72 hours, 48 hours, 36 hours, and 24 hours, corresponding to organic loads: 0.67 kgCOD/m3.day, 1.00 kgCOD/m3.day, 1.33 kgCOD/m3.day and 2.00 kgCOD/m3.day. The results show that the COD treatment capacity at HRTs for the UASB-AnMBR model has a higher efficiency of 0.4% - 5.4%. In addition, the biogas production rate at the HRTs for the UASB-AnMBR model was higher than that of the CSTR-AnMBR model from 0.02 to 0.03 Lbiogas/gCODremoval. The corresponding methane generation rate is in the range of 0.01 - 0.02 Lbiogas/gCODremoval. The membrane transfer pressure value recorded in the experiment shows that the operating cycle of the membrane for the UASB tank is longer than 3.5 times than CSTR tank.
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