The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent
The performance of a semi-commercial closed digester tank treating palm oil mill effluent (POME) was studied at four different mixing regimes i.e natural mixing (NM), minimal horizontal mixing (MHM), minimal horizontal and vertical mixing (MHVM) and vigorous mixing (VM). The chemical oxygen demand (...
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American-Eurasian Network for Scientific Information
2009
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my.upm.eprints.170942018-09-21T02:45:12Z http://psasir.upm.edu.my/id/eprint/17094/ The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent Sulaiman, Alawi Hassan, Mohd Ali Shirai, Yoshihito Abd. Aziz, Suraini Tabatabaei, Miesam Busu, Zainuri Yacob, Shahrakbah The performance of a semi-commercial closed digester tank treating palm oil mill effluent (POME) was studied at four different mixing regimes i.e natural mixing (NM), minimal horizontal mixing (MHM), minimal horizontal and vertical mixing (MHVM) and vigorous mixing (VM). The chemical oxygen demand (COD) removal efficiency recorded satisfactory result at higher than 90% when subjected to the first three mixing regimes but reduced to the lowest of 85% when VM was applied. In the NM, MHM and MHVM experiments, the maximum total volatile fatty acids (VFA) concentration in the digester was recorded below the critical level of 1000 mg L-1. The MHM gave the highest methane productivity at 1.4 m3 m-3 d-1 in comparison to NM at 1.0 m3 m-3 d-1 and MHVM at 1.1 m3 m-3 d-1. This indicates minimal mixing was required to provide good contact between substrate and microorganisms inside the digester and to release the entrapped biogas at the bottom of the digester. The VM on the other hand was discovered to inhibit the methane production process as methane was not produced at the end of the experiment and total VFA concentration was also recorded high at 3700 mg L-1. The high total VFA concentration in the system may have disrupted the syntrophic relationship between acidogens and methanogens and inhibited the methanogenesis. American-Eurasian Network for Scientific Information 2009 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/17094/1/170944.pdf Sulaiman, Alawi and Hassan, Mohd Ali and Shirai, Yoshihito and Abd. Aziz, Suraini and Tabatabaei, Miesam and Busu, Zainuri and Yacob, Shahrakbah (2009) The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent. Australian Journal of Basic and Applied Sciences, 3 (3). pp. 1577-1583. ISSN 1991-8178 http://ajbasweb.com/old/ajbas_july-september_2009.html |
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The performance of a semi-commercial closed digester tank treating palm oil mill effluent (POME) was studied at four different mixing regimes i.e natural mixing (NM), minimal horizontal mixing (MHM), minimal horizontal and vertical mixing (MHVM) and vigorous mixing (VM). The chemical oxygen demand (COD) removal efficiency recorded satisfactory result at higher than 90% when subjected to the first three mixing regimes but reduced to the lowest of 85% when VM was applied. In the NM, MHM and MHVM experiments, the maximum total volatile fatty acids (VFA) concentration in the digester was recorded below the critical level of 1000 mg L-1. The MHM gave the highest methane productivity at 1.4 m3 m-3 d-1 in comparison to NM at 1.0 m3 m-3 d-1 and MHVM at 1.1 m3 m-3 d-1. This indicates minimal mixing was required to provide good contact between substrate and microorganisms inside the digester and to release the entrapped biogas at the bottom of the digester. The VM on the other hand was discovered to inhibit the methane production process as methane was not produced at the end of the experiment and total VFA concentration was also recorded high at 3700 mg L-1. The high total VFA concentration in the system may have disrupted the syntrophic relationship between acidogens and methanogens and inhibited the methanogenesis. |
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Sulaiman, Alawi Hassan, Mohd Ali Shirai, Yoshihito Abd. Aziz, Suraini Tabatabaei, Miesam Busu, Zainuri Yacob, Shahrakbah |
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Sulaiman, Alawi Hassan, Mohd Ali Shirai, Yoshihito Abd. Aziz, Suraini Tabatabaei, Miesam Busu, Zainuri Yacob, Shahrakbah The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
author_facet |
Sulaiman, Alawi Hassan, Mohd Ali Shirai, Yoshihito Abd. Aziz, Suraini Tabatabaei, Miesam Busu, Zainuri Yacob, Shahrakbah |
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Sulaiman, Alawi |
title |
The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
title_short |
The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
title_full |
The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
title_fullStr |
The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
title_full_unstemmed |
The effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
title_sort |
effect of mixing on methane production in a semi-commercial closed digester tank treating palm oil mill effluent |
publisher |
American-Eurasian Network for Scientific Information |
publishDate |
2009 |
url |
http://psasir.upm.edu.my/id/eprint/17094/1/170944.pdf http://psasir.upm.edu.my/id/eprint/17094/ http://ajbasweb.com/old/ajbas_july-september_2009.html |
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