Abstract
AbstractPerformance of the novel sludge-bed anaerobic membrane bioreactor (SB-AnMBR) at a mesophilic (35°C) and a thermophilic (55°C) temperature was compared for the treatment of the prehydrolysis liquor (PHL) at organic loading rates (OLRs) ranging from 0.8 to 10 kg-COD/m3-d. An average chemical oxygen demand (COD) removal of 91% and a specific yield of 0.36 m3-CH4/kg-CODremoved/day [% relative standard deviation (RSTD) =4.6] was observed at a mesophilic temperature irrespective of the increase in loading rate. The temperature of the mesophilic (35°C) SB-AnMBR reactor was increased in a single step to achieve a thermophilic temperature (55°C). The one-step increase in temperature exerted stress on the biomass during the first 60 days of the operation at thermophilic temperature leading to the presence of slow-degrading lignin in the effluent with an average removal efficiency of less than 56% and average total COD removals of less than 60%. Subsequently, the methane yield was found to increase to an a...
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