Characterization of biogas production and microbial community in thermophilic anaerobic co-digestion of sewage sludge and paper waste. (October 2021)

• Record Type: Journal Article
• Authors: Zhu, Aijun; Qin, Yu; Wu, Jing; Ye, Min; Li, Yu-You
• Is Part Of: Bioresource technology. Volume 337(2021)
• Publication Date: 2021-10
• Subjects: Sewage sludge -- Paper waste -- Anaerobic co-digestion -- Biogas -- Microbial community; 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.2021.125371
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Thermophilic digestion of sewage sludge with PW was studied by various mixed ratio. Biogas yield increased from 438 to 594 mL/g-VS with paper waste ratio up to 60%. Paper waste addition weakened protein degradation and aggravated NH4 + -N shortage. The cellulolytic bacteria became predominant functional group after PW addition. Abstract: To recover the biogas from sewage sludge and paper waste (PW), the methanogenic performance of thermophilic anaerobic co-digestion of sewage sludge with PW was assessed by a continuous experiment. The effects on the biogas production and microbial community were investigated by changing the PW ratio from 0 to 66.7%. The optimal performance was obtained at the ratio of sewage sludge: PW = 4:6 (total solids), where the COD removal efficiency and biogas production increased from 58.34±5.90% to 72.92±0.08% and 438±53 to 594±72 mL/g-VSadded, respectively. By investigating the trend of carbohydrate and protein degradation rates, the competition between carbohydrate and protein degradation was quantified. The critical PW addition ratio was about (63.64%), where the protein degradation rate decreased to zero with increasing PW addition. Meanwhile, the microbial analysis showed that cellulolytic bacteria outcompeted proteolytic bacteria and to be the predominant group after PW addition.