NDLI: Effect of pH on anaerobic fermentative products distribution for kitchen waste

Content Provider	IEEE Xplore Digital Library
Author	Dong Li Yongming Sun Xiaoying Kong Lianhua Li Zhenhong Yuan Longlong Ma
Copyright Year	2010
Description	Author affiliation: Guangzhou Institute of Energy Conversion (GIEC), Chinese Academy of Sciences (CAS), China (Dong Li; Yongming Sun; Xiaoying Kong; Lianhua Li; Zhenhong Yuan; Longlong Ma)
Abstract	Batch tests were carried out to investigate the effect of pH adjustment (control, 5.1, 5.8, 6.5, 7.2 and 7.9) on anaerobic fermentative products distribution for kitchen waste. The experimental results showed that H2 and CO2 were main gas products during the acidification stage (first 5 day) for all fermentations. After the acidification stage, fermentation type was dependent on pH. No gas produced due to the inhibition of low pH 4.5 for the control. It was hydrogen-producing fermentations when reactors operated at pH 5.0–5.5, while it was methane-producing fermentations when reactors operated at pH 6.0–7.0. The acidogenesis pathway was ethanol-type with a little volatile fatty acids (VFAs) production when the pH in reactors were lower than 5.5, while the acidogenesis pathway was VFAs-type without alcohols production when the pH in digesters were 6.0–7.0. The optimal pH value for VFAs production was 7.0 and it was about 4.5 for ethanol production. No ammonia inhibition was found in this study. The degradations of kitchen waste were inhibited by the high concentration of VFAs. The inhibitory levels of undissociated acids on acidogenesis were about 1185, 1150, 979, 460 and 178 mg/L at final actual pH 5.2, 5.4, 6.0, 6.5 and 7.0 for five fermentations with pH adjusting respectively.
Starting Page	3935
Ending Page	3938
File Size	352051
Page Count	4
File Format	PDF
ISBN	9781424477371
e-ISBN	9781424477395
DOI	10.1109/MACE.2010.5535923
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-26
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ethanol Hydrogen Lipidomics Biochemistry Inductors Sun Proteins Kitchen waste Production Energy conversion PH Solids Anaerobic fermentation Products distribution
Content Type	Text
Resource Type	Article

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