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Piggery waste treatment by using down-flow anaerobic fixed bed reactors

Piggery waste treatment by using down-flow anaerobic fixed bed reactors
Piggery waste treatment by using down-flow anaerobic fixed bed reactors
A study of the role of the depth in the performance of laboratory-scale down-flow anaerobic fixed-bed reactors (DFAFBR) was carried out at different nominal hydraulic retention times (HRTN) using piggery waste as substrate at different influent concentrations (2, 4, 6 and 8 g COD/L). The profiles of soluble chemical oxygen demand (COD) (SCOD), organic nitrogen (O.N.), ammonia nitrogen (A.N.), pH and electrical conductivity (E.C.) through the reactor depths showed an initial highly active zone, which was located around the first half of the reactor depth, and a second zone with a lower biological activity. It was found that the depth of the active zone decreased as the HRTN increased and that the slopes of the profiles obtained increased with the rise in the influent concentration. A hydraulic test showed an increase in the dispersion number when the HRTN increased. The reactors showed a hydraulic pattern between plug-flow and back-mix. The real values of HRT (?) also defined as real contact times were determined to be 0.7, 2.1, 3.4, 4.7, 6.4 and 8 days for values of HRTN of 1, 2, 3, 4, 5 and 6 days, respectively. It was found that the concentration of SCOD within the reactor decreased exponentially with the increase in the value of ?. Additionally, the influent concentration had a strong influence on the SCOD variation concentration, mainly at values of ? under 1.5 days, which corresponded to the first part of the reactors.
depth, anaerobic fixed-bed reactor, down-flow, clay, rasching rings, performance, piggery waste
0360-1234
727-734
Sánchez, E.
8c460625-8a86-4050-baf5-c0d018fcd770
Travieso, L.
e85f590a-0cde-40ad-9048-6b8dba325367
Borja, R.
ed513484-04ff-4424-ab79-dc715ca63146
Colmenarejo, M.F.
4ddd264b-071b-429a-a34c-adba6017ffe1
Nikolaeva, S.
dd23d8c9-bc3c-420d-96fb-e4f571e5f28a
Raposo, F.
47104451-511a-4b03-aaa9-67348da4567d
Rincón, B.
d8fe6652-8ff6-4662-bfb7-3b231d140957
Sánchez, E.
8c460625-8a86-4050-baf5-c0d018fcd770
Travieso, L.
e85f590a-0cde-40ad-9048-6b8dba325367
Borja, R.
ed513484-04ff-4424-ab79-dc715ca63146
Colmenarejo, M.F.
4ddd264b-071b-429a-a34c-adba6017ffe1
Nikolaeva, S.
dd23d8c9-bc3c-420d-96fb-e4f571e5f28a
Raposo, F.
47104451-511a-4b03-aaa9-67348da4567d
Rincón, B.
d8fe6652-8ff6-4662-bfb7-3b231d140957

Sánchez, E., Travieso, L., Borja, R., Colmenarejo, M.F., Nikolaeva, S., Raposo, F. and Rincón, B. (2007) Piggery waste treatment by using down-flow anaerobic fixed bed reactors. Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants, and Agricultural Wastes, 42 (6), 727-734. (doi:10.1080/03601230701465999).

Record type: Article

Abstract

A study of the role of the depth in the performance of laboratory-scale down-flow anaerobic fixed-bed reactors (DFAFBR) was carried out at different nominal hydraulic retention times (HRTN) using piggery waste as substrate at different influent concentrations (2, 4, 6 and 8 g COD/L). The profiles of soluble chemical oxygen demand (COD) (SCOD), organic nitrogen (O.N.), ammonia nitrogen (A.N.), pH and electrical conductivity (E.C.) through the reactor depths showed an initial highly active zone, which was located around the first half of the reactor depth, and a second zone with a lower biological activity. It was found that the depth of the active zone decreased as the HRTN increased and that the slopes of the profiles obtained increased with the rise in the influent concentration. A hydraulic test showed an increase in the dispersion number when the HRTN increased. The reactors showed a hydraulic pattern between plug-flow and back-mix. The real values of HRT (?) also defined as real contact times were determined to be 0.7, 2.1, 3.4, 4.7, 6.4 and 8 days for values of HRTN of 1, 2, 3, 4, 5 and 6 days, respectively. It was found that the concentration of SCOD within the reactor decreased exponentially with the increase in the value of ?. Additionally, the influent concentration had a strong influence on the SCOD variation concentration, mainly at values of ? under 1.5 days, which corresponded to the first part of the reactors.

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More information

Published date: August 2007
Keywords: depth, anaerobic fixed-bed reactor, down-flow, clay, rasching rings, performance, piggery waste

Identifiers

Local EPrints ID: 52695
URI: http://eprints.soton.ac.uk/id/eprint/52695
ISSN: 0360-1234
PURE UUID: b4b03fac-d1d8-4c3d-bdb8-0f8939a5942c

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Date deposited: 14 Jul 2008
Last modified: 15 Mar 2024 10:38

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Contributors

Author: E. Sánchez
Author: L. Travieso
Author: R. Borja
Author: M.F. Colmenarejo
Author: S. Nikolaeva
Author: F. Raposo
Author: B. Rincón

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