Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation
Temperature phased anaerobic digestion (TPAD) systems with conventional sequences (first stage of 55 ℃ and second stage of 35 ℃) have been widely studied. However, very limited studies were available on TPAD system with the first stage operated at the intermediate zone of 45 °C, mainly due to the no...
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| Format: | Article |
| Language: | English |
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Penerbit Universiti Kebangsaan Malaysia
2021
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| Online Access: | http://journalarticle.ukm.my/17547/1/1.pdf |
| _version_ | 1796932672946176000 |
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| author | Nuruol Syuhadaa Mohd, Li, Baoqiang Shaliza Ibrahim, Rumana Riffat, |
| author_facet | Nuruol Syuhadaa Mohd, Li, Baoqiang Shaliza Ibrahim, Rumana Riffat, |
| author_sort | Nuruol Syuhadaa Mohd, |
| collection | UKM |
| description | Temperature phased anaerobic digestion (TPAD) systems with conventional sequences (first stage of 55 ℃ and second stage of 35 ℃) have been widely studied. However, very limited studies were available on TPAD system with the first stage operated at the intermediate zone of 45 °C, mainly due to the notion that limited microbial activity occurs within this zone. The objective of this research was to evaluate the performance, stability and the capability of 45 °C TPAD in producing class A biosolids, in comparison to a conventional TPAD. Four combinations of TPAD systems were studied, 45 ℃ TPAD 2.5/10 (1st stage solids retention time (SRT) 2.5 days/2nd stage SRT 10 days), 45 ℃ TPAD 7.5/10, 55 ℃ TPAD 2.5/10 and 55 ℃ TPAD 7.5/10. Among all, 45 ℃ TPAD 7.5/10 was found to have the best performances, attributed to its high volatile solids (VS) destruction (58%), minimal acetate accumulation (127 mg/L), high methane yield (0.58 m3 CH4/kg VS removed), high COD destruction solid COD (sCOD; 74% and total COD (tCOD) 54%) and minimal free NH3 content (67.5 mg/L). As for stability, stable pH distribution, high alkalinity content and low VFA to alkalinity ratio, indicated a well-buffered system. Additionally, the system had also able to produce class A biosolids. Therefore, proved that TPAD system operated at the intermediate zone of 45 ℃ can perform better than the conventional TPAD, hence, highlighting its economic advantage. |
| first_indexed | 2024-03-06T04:36:02Z |
| format | Article |
| id | ukm.eprints-17547 |
| institution | Universiti Kebangsaan Malaysia |
| language | English |
| last_indexed | 2024-03-06T04:36:02Z |
| publishDate | 2021 |
| publisher | Penerbit Universiti Kebangsaan Malaysia |
| record_format | dspace |
| spelling | ukm.eprints-175472021-11-15T01:27:32Z http://journalarticle.ukm.my/17547/ Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation Nuruol Syuhadaa Mohd, Li, Baoqiang Shaliza Ibrahim, Rumana Riffat, Temperature phased anaerobic digestion (TPAD) systems with conventional sequences (first stage of 55 ℃ and second stage of 35 ℃) have been widely studied. However, very limited studies were available on TPAD system with the first stage operated at the intermediate zone of 45 °C, mainly due to the notion that limited microbial activity occurs within this zone. The objective of this research was to evaluate the performance, stability and the capability of 45 °C TPAD in producing class A biosolids, in comparison to a conventional TPAD. Four combinations of TPAD systems were studied, 45 ℃ TPAD 2.5/10 (1st stage solids retention time (SRT) 2.5 days/2nd stage SRT 10 days), 45 ℃ TPAD 7.5/10, 55 ℃ TPAD 2.5/10 and 55 ℃ TPAD 7.5/10. Among all, 45 ℃ TPAD 7.5/10 was found to have the best performances, attributed to its high volatile solids (VS) destruction (58%), minimal acetate accumulation (127 mg/L), high methane yield (0.58 m3 CH4/kg VS removed), high COD destruction solid COD (sCOD; 74% and total COD (tCOD) 54%) and minimal free NH3 content (67.5 mg/L). As for stability, stable pH distribution, high alkalinity content and low VFA to alkalinity ratio, indicated a well-buffered system. Additionally, the system had also able to produce class A biosolids. Therefore, proved that TPAD system operated at the intermediate zone of 45 ℃ can perform better than the conventional TPAD, hence, highlighting its economic advantage. Penerbit Universiti Kebangsaan Malaysia 2021-07 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/17547/1/1.pdf Nuruol Syuhadaa Mohd, and Li, Baoqiang and Shaliza Ibrahim, and Rumana Riffat, (2021) Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation. Sains Malaysiana, 50 (7). pp. 1827-1841. ISSN 0126-6039 https://www.ukm.my/jsm/malay_journals/jilid50bil7_2021/KandunganJilid50Bil7_2021.html |
| spellingShingle | Nuruol Syuhadaa Mohd, Li, Baoqiang Shaliza Ibrahim, Rumana Riffat, Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation |
| title | Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation |
| title_full | Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation |
| title_fullStr | Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation |
| title_full_unstemmed | Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation |
| title_short | Temperature phased anaerobic digestion at the intermediate zone of 45 ℃ : performances, stability and pathogen deactivation |
| title_sort | temperature phased anaerobic digestion at the intermediate zone of 45 ℃ performances stability and pathogen deactivation |
| url | http://journalarticle.ukm.my/17547/1/1.pdf |
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