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13 3ȣ, September 2014
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ISSN : 2288-9167 (Print)
ISSN : 2288-923X (Online)
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The emission characteristics of odor compounds from the each process
of anaerobic digester using swine manure and food waste
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Abstracts
This study was performed to measure the concentration of odorous compounds and dilution ratio values at each
part of the anaerobic digester process with composting facilities using swine manure and food waste. Complex
odors, ammonia, volatile fatty acids and sulfur compounds were measured at each part of the process. Complex
odors measured during swine manure storage, food waste storage and in the digested liquid tank, were 35,312
Odor Unit(OU), 39,086 OU and 17,733 OU, respectively. The odor contribution index was calculated by the
concentration of odorous compounds during each process divided by the threshold limit. As a result, the major
odorous compound that appeared during swine manure storage, food waste storage and in the digested liquid tank
was hydrogen sulfide. On the other hand, the major odorous compound in the other processes was ammonia. The
overall average concentrations of ammonia were highest in the digested liquid tank(337 ppm) and the separated
liquid tank(131 ppm). Wastewater treatment process(10.9 ppm) and deodorization process(11.6 ppm) revealed the
lowest concentration of ammonia. The overall average concentration of total volatile fatty acids(TVFAs) was
102.8 ppb during food waste storage and among the TVFAs, the main element was propionic acid(66.1 ppb). Sulfur
compounds were only detected during swine manure storage, food waste storage and in the digested liquid tank.
The dominant sulfur compound was hydrogen sulfide during swine manure storage(96.3 ppm) and methyl
mercaptan during food waste storage(17.7 ppm) and dimethyl sulfide during food waste storage(34.5 ppm).
Keywords : Swine manure, Food waste, Anaerobic digestion, Composting, Odor