Enhanced degradation and biogas production of waste activated sludge by a high-solid anaerobic membrane bioreactor together with in pipe thermal pretreatment process. (February 2022)

• Record Type: Journal Article
• Authors: Guo, Guangze; Li, Yemei; Zhou, Shitong; Chen, Yujie; Qin, Yu; Li, Yu-You
• Is Part Of: Bioresource technology. Volume 346(2022)
• Publication Date: 2022-02
• Subjects: Waste activated sludge -- In pipe thermal pretreatment -- High-solid AnMBR -- Membrane filtration -- Mass balance; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.126583
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlight: WAS was innovatively treated by in pipe THP combined with high-solid AnMBR. Biogas yield was ranged in 0.42–0.47 L/g-VS, which improved 23.5–30.5% through THP. Methane conversion efficiency of in pipe thermal pretreated sludge was 44–45%. Membrane operated stably under average flux 9.6 LMH at MLTS 25 g/L. Abstract: An integrated system combining in pipe thermal pretreatment with a high-solid anaerobic membrane bioreactor (AnMBR) was developed to promote the anaerobic digestion of waste activated sludge (WAS). Two different pretreatment methods investigated were the venturi nozzle treatment (VNT) and steam injector treatment (SIT), both at a low temperature of 70 °C. The biogas production after pretreatment was 23.5–30.5% higher than that of untreated WAS, and the VS based biogas yield was 0.46–0.47 L/g-VS when HRT was 15 days. The membrane operated smoothly when the average flux was 9.6 and 4.5 L/m 2 /h under an MLTS of 25 and 30 g/L, respectively. The calculations of the mass balance indicated that 44–45% COD was converted to methane with pretreatment and only 1% remained in the permeate. That is, high energy recovery and organic matter removal efficiency were achieved for the treatment of WAS using the high-solid AnMBR with in pipe thermal pretreatment.