Emission rates of odorous compounds from pig slurries

✍ Scribed by Hobbs, Philip J; Misselbrook, Tom H; Pain, Brian F

• Book ID: 101224317
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 259 KB
• Volume: 77
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/(sici)1097-0010(199807)77:3<341::aid-jsfa45>3.0.co;2-9

✦ Synopsis

Techniques to identify odorous compounds and to determine their emission rates from liquid wastes are described. Odorous compounds, or odorants, were analysed by GC-MS and odour concentration was measured by olfactometry after being emitted from slurry under controlled environmental conditions using a specially designed odour emission chamber. The slurries were obtained from pigs fed commercial and reduced crude protein diets and stored for 6 weeks, the e †ects of age and sex upon the odours produced in the headspace of the chamber were evaluated. The major odorous compounds were iden-tiÐed as belonging to the sulphide, volatile fatty acid, phenolic and indolic chemical groups. The mean emission rates from 200 litres of stirred slurry samples with a surface area of 1 m2 using a wind speed of 4 m s~1 were 1É35 million Odour Units min~1 for odour and 214, 2É15, 0É21, 0É44, 0É068 and 0É02 mg min~1 for hydrogen sulphide, ammonia, phenol, 4-methyl phenol, 4-ethyl phenol and indole respectively. Sex and sex/diet interaction e †ects were demonstrated for emission rates.

1998 SCI.