Pilot-scale H₂S and swine odor removal system using commercially available biochar

Authors

Kyoung S. Ro, United States Department of AgricultureFollow
Brian Woodbury, USDA MARCFollow
Mindy Spiehs, USDA ARS Roman L. Hruska U.S. Meat Animal Research CenterFollow
Ariel A. Szogi, United States Department of AgricultureFollow
Philip J. Silva, USDA-ARS, Bowling Green, KYFollow
Okhwa Hwang, Rural Development AdministrationFollow
Sungback Cho, Institute of Livestock Odor ControlFollow

ORCID IDs

Kyoung S. Ro https://orcid.org/0000-0002-2622-8279

Ariel A. Szogi https://orcid.org/0000-0002-8268-9248

Okhwa Hwang https://orcid.org/0000-0003-0681-4577

Date of this Version

8-1-2021

Document Type

Article

Citation

Ro, K.S.;Woodbury, B.; Spiehs, M.; Szogi, A.A.; Silva, P.J.; Hwang, O.; Cho, S. Pilot-Scale H2S and Swine Odor Removal System Using Commercially Available Biochar. Agronomy 2021, 11, 1611. https://doi.org/10.3390/ agronomy11081611

Comments

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license

Abstract

Although biochars made in laboratory seem to remove H2S and odorous compounds effectively, very few studies are available for commercial biochars. This study evaluated the efficacy of a commercial biochar (CBC) for removing H2S and odorous volatile organic compounds (VOCs). We found that the well-known Ergun equation may not be adequate in predicting pressure drop for properly sizing a ventilation system. The H2S breakthrough adsorption capacity of the CBC was 2.51 mg/g under humid conditions, which was much higher than that for dry conditions. The breakthrough capacity increased with the influent concentration of H2S. The efficacy of a pilot-scale biochar odor removal system (PSBORS) for removing 15 odorous VOCs was evaluated by placing it in a swine gestation stall continually treating the inside air for 21 days. All VOCs in the PSBORS effluent were below detection limit except for acetic acid. However, due to the very high odor threshold of acetic acid, its contribution to the odor would be minimal. It appeared that the CBC could be used to reduce both H2S and odorous VOCs with the potential of recycling the spent CBC for soil health improvement after using it for H2S and odor removal.