Anaerobic digestion and gasification coupling for wastewater sludge treatment and recovery
Sewage sludge management is an energy intensive process. Anaerobic digestion contributes to energy efficiency improvement but is limited by the biological process. A review has been conducted prior to experimentation in order to evaluate the mass and energy balances on anaerobic digestion followed b...
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| Veröffentlicht in: | Waste management & research 2014-07, Vol.32 (7), p.608-613 |
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| creator | Lacroix, Nicolas Rousse, Daniel R Hausler, Robert |
| description | Sewage sludge management is an energy intensive process. Anaerobic digestion contributes to energy efficiency improvement but is limited by the biological process. A review has been conducted prior to experimentation in order to evaluate the mass and energy balances on anaerobic digestion followed by gasification of digested sludge. The purpose was to improve energy recovery and reuse. Calculations were based on design parameters and tests that are conducted with the anaerobic digester of a local wastewater treatment plant and a small commercial gasification system. Results showed a very significant potential of energy recovery. More than 90% of the energy content from sludge was extracted. Also, approximately the same amount of energy would be transferred in both directions between the digester (biogas) and the gasifier (thermal energy). This extraction resulted in the same use of biogas as the reference scenario but final product was a totally dry biochar, which represented a fraction of the initial mass. Phosphorus was concentrated and significantly preserved. This analysis suggests that anaerobic digestion followed by dehydration, drying and gasification could be a promising and viable option for energy and nutrient recovery from municipal sludge in replacement of conventional paths. |
| doi_str_mv | 10.1177/0734242X14538308 |
| format | Article |
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Anaerobic digestion contributes to energy efficiency improvement but is limited by the biological process. A review has been conducted prior to experimentation in order to evaluate the mass and energy balances on anaerobic digestion followed by gasification of digested sludge. The purpose was to improve energy recovery and reuse. Calculations were based on design parameters and tests that are conducted with the anaerobic digester of a local wastewater treatment plant and a small commercial gasification system. Results showed a very significant potential of energy recovery. More than 90% of the energy content from sludge was extracted. Also, approximately the same amount of energy would be transferred in both directions between the digester (biogas) and the gasifier (thermal energy). This extraction resulted in the same use of biogas as the reference scenario but final product was a totally dry biochar, which represented a fraction of the initial mass. Phosphorus was concentrated and significantly preserved. This analysis suggests that anaerobic digestion followed by dehydration, drying and gasification could be a promising and viable option for energy and nutrient recovery from municipal sludge in replacement of conventional paths.</description><identifier>ISSN: 0734-242X</identifier><identifier>EISSN: 1096-3669</identifier><identifier>DOI: 10.1177/0734242X14538308</identifier><identifier>PMID: 24972600</identifier><language>eng</language><publisher>London, England: SAGE Publications</publisher><subject>Anaerobic digestion ; Anaerobiosis ; Biofuels - analysis ; Biogas ; Bioreactors ; Drying ; Energy ; Energy efficiency ; Energy management ; Energy recovery ; Gasification ; Refuse as fuel ; Sewage - analysis ; Sludge ; Studies ; Waste Disposal, Fluid - methods ; Waste Water - analysis ; Wastewater treatment ; Water treatment</subject><ispartof>Waste management & research, 2014-07, Vol.32 (7), p.608-613</ispartof><rights>The Author(s) 2014</rights><rights>The Author(s) 2014.</rights><rights>Copyright Sage Publications Ltd. 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Anaerobic digestion contributes to energy efficiency improvement but is limited by the biological process. A review has been conducted prior to experimentation in order to evaluate the mass and energy balances on anaerobic digestion followed by gasification of digested sludge. The purpose was to improve energy recovery and reuse. Calculations were based on design parameters and tests that are conducted with the anaerobic digester of a local wastewater treatment plant and a small commercial gasification system. Results showed a very significant potential of energy recovery. More than 90% of the energy content from sludge was extracted. Also, approximately the same amount of energy would be transferred in both directions between the digester (biogas) and the gasifier (thermal energy). This extraction resulted in the same use of biogas as the reference scenario but final product was a totally dry biochar, which represented a fraction of the initial mass. Phosphorus was concentrated and significantly preserved. This analysis suggests that anaerobic digestion followed by dehydration, drying and gasification could be a promising and viable option for energy and nutrient recovery from municipal sludge in replacement of conventional paths.</description><subject>Anaerobic digestion</subject><subject>Anaerobiosis</subject><subject>Biofuels - analysis</subject><subject>Biogas</subject><subject>Bioreactors</subject><subject>Drying</subject><subject>Energy</subject><subject>Energy efficiency</subject><subject>Energy management</subject><subject>Energy recovery</subject><subject>Gasification</subject><subject>Refuse as fuel</subject><subject>Sewage - analysis</subject><subject>Sludge</subject><subject>Studies</subject><subject>Waste Disposal, Fluid - methods</subject><subject>Waste Water - analysis</subject><subject>Wastewater treatment</subject><subject>Water treatment</subject><issn>0734-242X</issn><issn>1096-3669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkc1Lw0AQxRdRbK3ePUnAi5fobPYzRxG_oOBFQbyEzWYSUtJs3U0U_3vTD0UKQk8DM7_3hscj5JTCJaVKXYFiPOHJK-WCaQZ6j4wppDJmUqb7ZLw8x8v7iByFMAMArjkcklHCU5VIgDF5u24NepfXNirqCkNXuzYybRFVJtRlbc1qYV2_aOq2ikrno08TOvw0HfooNH1RYdR5NN0c226l9GjdB_qvY3JQmibgyWZOyMvd7fPNQzx9un-8uZ7GVjDexWnKlASVgwBMBc2lBp4oJnOe0AIESwtqhDTaqsJoYWWZi1QwQESem0HFJuRi7bvw7r0fImTzOlhsGtOi60NGNdWMCSV3QKWWnFGm9C4ocLaiJ-R8C5253rdD5owKLmUCTC1_w5qy3oXgscwWvp4b_5VRyJZtZtttDpKzjXGfz7H4FfzUNwDxGgimwj9f_zP8BpmbpX8</recordid><startdate>20140701</startdate><enddate>20140701</enddate><creator>Lacroix, Nicolas</creator><creator>Rousse, Daniel R</creator><creator>Hausler, Robert</creator><general>SAGE Publications</general><general>Sage Publications Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7SC</scope><scope>7SE</scope><scope>7SP</scope><scope>7SR</scope><scope>7ST</scope><scope>7T7</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>P64</scope><scope>SOI</scope><scope>7TV</scope><scope>7SU</scope><scope>7X8</scope></search><sort><creationdate>20140701</creationdate><title>Anaerobic digestion and gasification coupling for wastewater sludge treatment and recovery</title><author>Lacroix, Nicolas ; 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Anaerobic digestion contributes to energy efficiency improvement but is limited by the biological process. A review has been conducted prior to experimentation in order to evaluate the mass and energy balances on anaerobic digestion followed by gasification of digested sludge. The purpose was to improve energy recovery and reuse. Calculations were based on design parameters and tests that are conducted with the anaerobic digester of a local wastewater treatment plant and a small commercial gasification system. Results showed a very significant potential of energy recovery. More than 90% of the energy content from sludge was extracted. Also, approximately the same amount of energy would be transferred in both directions between the digester (biogas) and the gasifier (thermal energy). This extraction resulted in the same use of biogas as the reference scenario but final product was a totally dry biochar, which represented a fraction of the initial mass. 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| subjects | Anaerobic digestion Anaerobiosis Biofuels - analysis Biogas Bioreactors Drying Energy Energy efficiency Energy management Energy recovery Gasification Refuse as fuel Sewage - analysis Sludge Studies Waste Disposal, Fluid - methods Waste Water - analysis Wastewater treatment Water treatment |
| title | Anaerobic digestion and gasification coupling for wastewater sludge treatment and recovery |
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