Biofuel Produced from Solid-State Anaerobic Digestion of Dairy Cattle Manure in Coordination with Black Soldier Fly Larvae Decomposition

This study was conducted to evaluate the feasibility of applying a two-step biological treatment process, solid-state anaerobic digestion (SSAD) and black soldier fly larvae (BSFL) composting, for the treatment of dairy cattle manure. Biogas from the SSAD of dairy cattle manure, and the digestate of SSAD was fed to BSFL. In turn, BSFL can be fed to animals as a protein supplement. Adjustment of the pH and 30% inoculation ratio (IR30) during SSAD produced the highest theoretical methane yield, 626.1 ± 28.7 L CH4/kg VSdes, with an ultimate methane yield of 96.81 ± 2.0 L CH4/kg VSload. For BSFL composting, the groups with a feeding rate of 75 and 100 mg/day/larvae had the highest body weight change, which was 969.6 ± 28.4% and 984.1 ± 177.6%, respectively. The combination process of SSAD and BSFL composting increases the incentive for dairy cattle manure treatment instead of conventional composting and produced more valuable products.

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Biofuel Produced from Solid-State Anaerobic Digestion of Dairy Cattle Manure in Coordination with Black Soldier Fly Larvae Decomposition

10.20944/preprints201812.0354.v1 ◽

2018 ◽

Author(s):

Choon Yong Wee ◽

Jung-Jeng Su

Keyword(s):

Anaerobic Digestion ◽

Solid State ◽

Dairy Cattle ◽

Cattle Manure ◽

Methane Yield ◽

Black Soldier Fly ◽

Combination Process ◽

Black Soldier Fly Larvae ◽

Fly Larvae ◽

Biological Treatment Process

This study was conducted to evaluate the feasibility of applying a two-step biological treatment process, solid-state anaerobic digestion (SSAD) and black soldier fly larvae (BSFL) composting, for treating dairy cattle manure. Biogas from SSAD of dairy cattle manure, and the digestate of SSAD was fed to BSFL. In turn, BSFL can be fed to animals as a protein supplement. Adjustment of pH and 30% inoculation ratio (IR30) during SSAD produced the highest theoretical methane yield, 626.1±28.7 L CH4/kg VSdes, with an ultimate methane yield of 96.81±2.0 L CH4/kg VSload. For BSFL composting, the groups with a feeding rate of 75 and 100 mg/day/larvae had the highest body weight change, which was 969.6±28.4 and 984.1±177.6%, respectively. The combination process of SSAD and BSFL composting increases the incentive for dairy cattle manure treatment enabled higher waste removal efficiency, and produced more valuable products.

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The effect of mixed-enzyme addition in anaerobic digestion on methane yield of dairy cattle manure

Environmental Technology ◽

10.1080/09593330.2014.911356 ◽

2014 ◽

Vol 35 (19) ◽

pp. 2476-2482 ◽

Cited By ~ 13

Author(s):

Sutaryo Sutaryo ◽

Alastair James Ward ◽

Henrik Bjarne Møller

Keyword(s):

Anaerobic Digestion ◽

Dairy Cattle ◽

Cattle Manure ◽

Methane Yield

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Mesophilic–thermophilic–mesophilic anaerobic digestion of liquid dairy cattle manure

Water Science & Technology ◽

10.2166/wst.2006.256 ◽

2006 ◽

Vol 53 (8) ◽

pp. 253-261 ◽

Cited By ~ 8

Author(s):

M. Effenberger ◽

J. Bachmaier ◽

G. Garcés ◽

A. Gronauer ◽

P.A. Wilderer ◽

...

Keyword(s):

Anaerobic Digestion ◽

Dairy Cattle ◽

Loading Rate ◽

Cattle Manure ◽

Methane Yield ◽

Stirred Tank ◽

Tank Reactor ◽

Digestion Efficiency ◽

Continuously Stirred Tank Reactor ◽

Intestinal Enterococci

The potential of a mesophilic–thermophilic–mesophilic anaerobic digestion system was investigated with respect to improvement of both digestion and sanitation efficiencies during treatment of liquid cattle manure. The pilot plant produced a high methane yield from liquid dairy cattle manure of 0.24 m3 (kg VSfed)−1. Considering the low system loading rate of 1.4–1.5 kg VS (m3 d)−1, digestion efficiency compared to conventional processes did not appear improved. The minimum guaranteed retention time in the tubular thermophilic reactor was increased compared to a continuously stirred tank reactor. Levels of intestinal enterococci in raw liquid manure as determined with cultivation methods were reduced by 2.5–3 log units to a level of around 102 cfu/mL. This sanitizing effect was achieved both during mesophilic–thermophilic–mesophilic and thermophilic–mesophilic treatment, provided the thermophilic digester was operated at 53–55°C. A change in feeding interval from 1 h to 4 h did not significantly alter methane yield and sanitation efficiency. It was proposed that a two-stage, thermophilic–mesophilic anaerobic digestion system would be able to achieve the same sanitizing effect and equal or better digestion efficiency at lower costs.

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