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1. Anaerobic digestion of food waste stabilized by lime mud from papermaking process.

Author

Zhang J, Wang Q, Zheng P, and Wang Y

Subjects
Anaerobiosis, Calcium Compounds metabolism, China, Methanobacteriaceae metabolism, Oxides metabolism, Paper, Digestion physiology, Food, Methane biosynthesis, Methanobacteriaceae physiology, Refuse Disposal methods, Waste Products
Abstract

The effects of lime mud from papermaking process (LMP) addition as buffer agent and inorganic nutrient on the anaerobic digestion stability of food waste (FW) were investigated under mesophilic conditions with the aim of avoiding volatile fatty acids accumulation, and inorganic elements deficiency. When LMP concentration ranged from 6.0 to 10g/L, the FW anaerobic digestion could maintain efficient and stable state. These advantages are attributed to the existence of Ca, Na, Mg, K, Fe, and alkaline substances that favor the methanogenic process. The highest CH4 yield of 272.8mL/g-VS was obtained at LMP and VS concentrations of 10.0 and 19.8g/L, respectively, with the corresponding lag-phase time of 3.84d and final pH of 8.4. The methanogens from residue digestates mainly consisted of Methanobrevibacter, coccus-type and sarcina-type methanogens with LMP addition compared to Methanobacteria in control. However, higher concentration of LMP inhibited methanogenic activities and methane production., (Copyright © 2014 Elsevier Ltd. All rights reserved.)

Published
2014
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2. Anaerobic digestion of food waste stabilized by lime mud from papermaking process

Author

Yusong Wang, Jishi Zhang, Qinqing Wang, and Pengwei Zheng

Subjects
Paper, China, Methanobacteriaceae, Environmental Engineering, Bioengineering, engineering.material, Methanobacteria, Methane, Residue (chemistry), chemistry.chemical_compound, Anaerobiosis, Food science, Waste Management and Disposal, Lime, Waste Products, Waste management, biology, Renewable Energy, Sustainability and the Environment, Oxides, General Medicine, Calcium Compounds, biology.organism_classification, Refuse Disposal, Methanobrevibacter, Anaerobic digestion, Food waste, chemistry, Food, engineering, Digestion, Mesophile
Abstract

The effects of lime mud from papermaking process (LMP) addition as buffer agent and inorganic nutrient on the anaerobic digestion stability of food waste (FW) were investigated under mesophilic conditions with the aim of avoiding volatile fatty acids accumulation, and inorganic elements deficiency. When LMP concentration ranged from 6.0 to 10g/L, the FW anaerobic digestion could maintain efficient and stable state. These advantages are attributed to the existence of Ca, Na, Mg, K, Fe, and alkaline substances that favor the methanogenic process. The highest CH4 yield of 272.8mL/g-VS was obtained at LMP and VS concentrations of 10.0 and 19.8g/L, respectively, with the corresponding lag-phase time of 3.84d and final pH of 8.4. The methanogens from residue digestates mainly consisted of Methanobrevibacter, coccus-type and sarcina-type methanogens with LMP addition compared to Methanobacteria in control. However, higher concentration of LMP inhibited methanogenic activities and methane production.

Published
2014