Thermochemical conversion of swine manure: an alternative process for waste treatment and renewable energy production.
2000
A thermochemical conversion (TCC) process was applied to the treatment of swine manure slurry for oil
production and waste reduction. The objectives of the first stage study were to explore the feasibility of oil production
from swine manure and to determine the waste reduction rates through the TCC process. A bench TCC reactor was
developed and tested at operating temperatures of 275°C to 350°C. The corresponding operating pressures ranged from
5.5 to 18 MPa. Carbon monoxide was used as a reducing agent at pressures from 0.34 to 2.76 MPa. The oil product was
evaluated by element analysis, heating value, and benzene solubility. The waste reduction rate was evaluated in terms of
chemical oxygen demand (COD) before and after the TCC process. The highest oil yield was 76.2% of the total volatile
solids of the feedstock. The hydrogen to carbon molar ratio was 1.53. The TCC oil product had a similar quality as that of
pyrolysis oils from liquefaction of other biomass such as wood sludge and newspaper waste. The average heating value of
the oil product was estimated at 34 940 kJ/kg. The COD in the post-processed water after the TCC process was reduced
as much as 75.4%. Carbon dioxide was the sole detected gaseous by-product. The solid by-product of the TCC process
was only 3.3% of the total solids input by weight.
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