Changes in physical properties of a compost biofilter treating hydrogen sulfide.
J Air Waste Manag Assoc
; 53(8): 1011-21, 2003 Aug.
Article
em En
| MEDLINE
| ID: mdl-12943321
A technique is presented that can be used to estimate the changes in physical structure in a natural biofilter packing medium, such as compost, over time. The technique applies information from tracer studies, grain size distribution, and pressure drop analysis to a model that estimates the number of channels, average channel diameter, number of particles, and specific surface area of the medium. Important operational factors, such as moisture content, pressure drop, and sulfate accumulation also were evaluated both in a conventionally operated biofilter and in one operated with periodic compost mixing. In the conventionally operated laboratory-scale compost biofilter, hydrogen sulfide (H2S) removal efficiency decreased from 100% to approximately 90% over 206 days of operation. In a similar system, operated with compost mixing, the H2S removal efficiency was maintained near 100%. Variations in media moisture conditions and specific surface area can explain the results observed in this study. Under conventional operation, drying near the inlet disintegrated the compost particles, producing a large number of particles and flow channels and increasing the specific surface area. At the top of the column, where moisture was added, particle size increased and specific surface area decreased. In the column with media mixing, moisture content, particle size, and specific surface area remained homogeneous.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poluição do Ar
/
Sulfeto de Hidrogênio
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
J Air Waste Manag Assoc
Assunto da revista:
SAUDE AMBIENTAL
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
México
País de publicação:
Estados Unidos