Integrated biological and electro-chemical treatment of swine manure.
A full-scale biogas plant was applied to the processing of 10 m3/d of swine manure. The plant consisted of an anaerobic digester and an engine-generator. The digester operation resulted in an 81% of COD removal, a 55% of VS reduction, and methane-rich biogas production that is used to generate electrical and thermal energies. To further treat the digested manure, for compliance with discharge limits, an electro-chemical oxidation with a dimensionally sable anode was investigated for the simultaneous elimination of both the remaining COD and ammonia nitrogen. It was able to reduce NH4+-N levels from as high as 1552 down to 25 mg/L in 160 min, and the COD from 1542 to 0.21 mg/L under the experimental conditions of 8 V, 30 A and 20,000 microS/cm. The amount of electricity required for a 90% removal of the residual COD and ammonia in 1 m3 of filtered digester manure, via electrochemical oxidation, were approximately 153 and 151 kWh, respectively. These values exceed the maximum potential capacity of the biogas-originated electricity through the digestion of swine manure containing normal VS content. However, approximately 50% of the required electricity for the electrochemical oxidation could be supplied from the engine-generator.
Chae
K J
KJ
R&D Institute, Kolon Engineering and Construction Co., Ltd., 207-2, Mabuk-Ri, Guseong-Eup, Youngin, Kyungki, Korea. ckj@kolon.com
Yim
S K
SK
Choi
K H
KH
Kim
S K
SK
Park
W K
WK
D000818:Animals; D001674:Bioelectric Energy Sources; D019149:Bioreactors; D004563:Electrochemistry; D004738:Engineering; D005740:Gases; D008372:Manure; D008697:Methane / Q000032:analysis; D009584:Nitrogen / Q000378:metabolism*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*
D005740:Gases; D008372:Manure; D009584:Nitrogen; D008697:Methane; D010100:Oxygen