Anaerobic co-digestion of food waste and dairy manure: effects of food waste particle size and organic loading rate

Journal of Environmental Management
Fred O Agyeman, Wendong Tao

Abstract

This study was to comprehensively evaluate the effects of food waste particle size on co-digestion of food waste and dairy manure at organic loading rates increased stepwise from 0.67 to 3 g/L/d of volatile solids (VS). Three anaerobic digesters were fed semi-continuously with equal VS amounts of food waste and dairy manure. Food waste was ground to 2.5 mm (fine), 4 mm (medium), and 8 mm (coarse) for the three digesters, respectively. Methane production rate and specific methane yield were significantly higher in the digester with fine food waste. Digestate dewaterability was improved significantly by reducing food waste particle size. Specific methane yield was highest at the organic loading rate of 2g VS/L/d, being 0.63, 0.56, and 0.47 L CH4/g VS with fine, medium, and coarse food waste, respectively. Methane production rate was highest (1.40-1.53 L CH4/L/d) at the organic loading rate of 3 g VS/L/d. The energy used to grind food waste was minor compared with the heating value of the methane produced.

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Citations

Oct 16, 2015·Journal of Environmental Management·Xin KongLiang He
Apr 9, 2016·Waste Management·Anna JankAnke Bockreis
May 30, 2016·Waste Management·Rosalinda Campuzano, Simón González-Martínez
Aug 11, 2016·Waste Management·Victoria M LopezMorton A Barlaz
Jan 22, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Feng WangXue-Nong Yi
Mar 16, 2017·BioMed Research International·Kunwar ParitoshVivekanand Vivekanand
Mar 11, 2017·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Kaining ZhaoHui Guo
Sep 16, 2017·Applied Microbiology and Biotechnology·Yubo WangTong Zhang
Apr 30, 2017·Scientific Reports·Jingxin ZhangYen Wah Tong
Nov 8, 2020·Journal of the Science of Food and Agriculture·Hsinjung ChenChin-Shuh Chen

Related Concepts

Anaerobiosis
Dairying
Nutrients
Manure
Particle Size
Waste Management
Digestion
Food
Methane
Volatile Substances

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