Evaluation of bioenergy production and material flow in treating Japanese concentrated Johkasou sludge using high-solid anaerobic membrane bioreactor based on one-year operation

•Bioenergy production and mass flow of CJoS digestion by AnMBR were investigated.•The biogas yield of CJoS was 0.47–0.52 L/g-VS and methane conversion was 46–52%.•Biogas yield of CJoS by AnMBR exceeded the value of WAS but was lower than the MSS.•The highest carbon conversion rate in biogas was achieved during winter (58.03%).•The best dewaterability was achieved when the optimal PoF dosage was 30 mg/g-MLSS.