Effect of Inoculum Concentration and Particle Size of the Substrate on Anaerobic Digestion of Yard Waste

ABSTRACT This paper studied the effect of adding an enzyme (ellulose) on anaerobic digestion of maize silage. We compared materials at chopping lengths of 8 mm (MSL), 4mm (MSS) and natural size (Ms) under a mesophilic and discontinuous operation (batch process). Hence, we found the process to be significantly influenced by particle size. Moreover, the ellulose addition did not significantly impact biogas production after a 35-day digestion period. Ms and MSS displayed an improved response to all variables when compared with MSL and MSL+C, with significant differences. Studies on the refractory fraction at infinite time (R0) have demonstrated that the lowest values correspond to Ms and MSS (0.122 and 0.155, respectively). The Kinetic approach and the Ultimate Biodegradability test are useful tools to evaluate the effect of the addition of an enzyme to the anaerobic process.

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Effects of particle size on anaerobic digestion of tomato solid wastes

Agricultural Wastes ◽

10.1016/0141-4607(84)90004-0 ◽

1984 ◽

Vol 10 (4) ◽

pp. 285-295 ◽

Cited By ~ 44

Author(s):

David J. Hills ◽

Kouichi Nakano

Keyword(s):

Particle Size ◽

Anaerobic Digestion ◽

Solid Wastes

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Temperature effect on anaerobic digestion of bedding straw in a one phase system at different inoculum concentration

Agriculture Ecosystems & Environment ◽

10.1016/0167-8809(95)00592-g ◽

1995 ◽

Vol 54 (1-2) ◽

pp. 55-66 ◽

Cited By ~ 30

Author(s):

R. Torres-Castillo ◽

P. Llabrés-Luengo ◽

J. Mata-Alvarez

Keyword(s):

Anaerobic Digestion ◽

Temperature Effect ◽

Phase System ◽

Inoculum Concentration

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Anaerobic digestion of organic waste in Japan: the first demonstration plant at Kyoto City

Water Science & Technology ◽

10.2166/wst.2002.0416 ◽

2002 ◽

Vol 45 (12) ◽

pp. 113-118 ◽

Cited By ~ 1

Author(s):

T. Komatsu ◽

T. Kimura ◽

Y. Kuriyama ◽

Y. Isshiki ◽

T. Kawano ◽

...

Keyword(s):

Anaerobic Digestion ◽

Municipal Solid Waste ◽

Solid Waste ◽

Energy Recovery ◽

Organic Waste ◽

Yard Waste ◽

Kyoto City ◽

Demonstration Plant

Recycling of Municipal Solid Waste is vigorously promoted in Japan and the necessity of energy recovery from organic waste is increasing. An anaerobic digestion demonstration plant for organic waste in Kyoto City, Japan has been operated for about two years. Three kinds of wastes (garbage and leftovers from hotels, yard waste and used paper) mixed at various ratios are used. The plant has maintained stable operations with each mixture, generating biogas by the decomposition of VS at the rate of about 820 m3N/ton-VS.

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Co-digestion of manure and biowaste according to the EC Animal By-Products Regulation and Finnish national regulations

Water Science & Technology ◽

10.2166/wst.2006.253 ◽

2006 ◽

Vol 53 (8) ◽

pp. 223-231 ◽

Cited By ~ 17

Author(s):

T. Paavola ◽

E. Syväsalo ◽

J. Rintala

Keyword(s):

Particle Size ◽

Anaerobic Digestion ◽

Retention Time ◽

Methane Production ◽

Hydraulic Retention Time ◽

Treatment Temperature ◽

Undetectable Level ◽

Similar Treatment ◽

Treatment Methods ◽

By Products

The objective of this study was to compare methane production and characteristics of digested material in anaerobic digestion concepts according to the Animal By-Products Regulation (ABP-Regulation) of the EC (hygienisation of biowaste for 1 hour at 70 °C, particle size <12 mm) and Finnish national regulations (treatment temperature 55 °C, feeding interval 24 h, hydraulic retention time (HRT) 20 d, particle size <40 mm) and with small variations in treatment methods for treating manure and biowaste. Moreover, the survival of three different salmonella bacteria in these processes was studied. Hygienisation of biowaste prior to digestion at 35 °C enhanced methane production by 14–18% compared to similar treatment without hygienisation. The differences in treatment temperature, HRT and hygienisation of biowaste prior to digestion did not significantly affect the characteristics of digested material. The concepts according to the ABP-Regulation and Finnish national regulations were effective in destroying salmonella bacteria to an undetectable level.

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