title: Comparison of sludge digestion under aerobic and anaerobic conditions with a focus on the degradation of proteins at mesophilic temperature.
abstract: Aerobic and anaerobic digestion are popular methods for the treatment of waste activated sludge. However, the differences in degradation of sludge during aerobic and anaerobic digestion remain unclear. In this study, the sludge degradation during aerobic and anaerobic digestion was investigated at mesophilic temperature, focused on protein based on the degradation efficiency and degree of humification. The duration of aerobic and anaerobic digestion was about 90 days. The final degradation efficiency of volatile solid was 66.1 ± 1.6% and 66.4 ± 2.4% under aerobic and anaerobic conditions, respectively. The final degradation efficiency of protein was 67.5 ± 1.4% and 65.1 ± 2.6% under aerobic and anaerobic conditions, respectively. The degradation models of volatile solids were consistent with those of protein under both aerobic and anaerobic conditions. The solubility of protein under aerobic digestion was greater than that under anaerobic digestion. Moreover, the humification index of dissolved organic matter of aerobic digestion was greater than that during anaerobic digestion.
authors.affiliation: Centre for the Technology Research and Training on Household Waste in Small Towns & Rural Area, Ministry of Housing and Urban-Rural Development (MOHURD), PR China.
authors.forename: Liming
authors.initials: L
authors.lastname: Shao
authors.forename: Tianfeng
authors.initials: T
authors.lastname: Wang
authors.forename: Tianshui
authors.initials: T
authors.lastname: Li
authors.forename: Fan
authors.initials: F
authors.lastname: Lü
authors.forename: Pinjing
authors.initials: P
authors.lastname: He
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001426:Bacterial Proteins / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000032:analysis; D006812:Humic Substances / Q000032:analysis; D057927:Hydrophobic and Hydrophilic Interactions; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000737:chemistry; D012722:Sewage / Q000382:microbiology*; D013050:Spectrometry, Fluorescence; D013696:Temperature; D014835:Volatilization; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D001426:Bacterial Proteins; D006812:Humic Substances; D009930:Organic Chemicals; D012722:Sewage; D002244:Carbon; D009584:Nitrogen