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Content Provider | IET Digital Library |
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Author | Zhang, Yanghanzi Caldwell, Gary S. Sallis, Paul J. |
Abstract | Anaerobic digestion (AD) of microalgae is a sustainable process to produce methane-rich biogas for bioenergy production. However, the rigid cell walls of microalgae protect them against the attack from hydrolytic bacteria, and consequently prevent efficient biodegradability and lower methane production. In this study, the effects of low energy demand enzymatic and low-temperature thermo-alkaline pre-treatments on microalgae AD were investigated in batch biochemical methane potential tests. The results found that methane yields were significantly enhanced by both pre-treatments. Microalgae Chlorella vulgaris (C. vulgaris) after enzymatic pre-treatment enhanced methane yields the most, by 22–162%, whilst C. vulgaris pre-treated by thermo-alkaline pre-treatment improved methane yields by 4–26%. In enzymatic pre-treatment, C. vulgaris pre-treated with mixed enzymes showed higher methane yields compared to single enzymes. In low-temperature thermo-alkaline pre-treatment, the level of enhancement in methane yields depended on the alkaline dosage and pre-treatment temperature, but the high alkaline dosages were associated with limitations such as a prolonged lag phase in the digestion process. From an energy viewpoint, both pre-treatments showed positive energy balances for the majority of experimental conditions, and therefore both pre-treatments are considered to be energetically efficient methods to pre-treat microalgae for methane production via AD. |
Starting Page | 1701 |
Ending Page | 1710 |
Page Count | 10 |
ISSN | 17521416 |
Volume Number | 13 |
e-ISSN | 17521424 |
Issue Number | Issue 10, Jul (2019) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rpg/13/10 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2018.6080 |
Journal | IET Renewable Power Generation |
Publisher Date | 2019-04-11 |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | Batch Biochemical Methane Potential Tests Biodegradable Materials Bioenergy Conversion Bioenergy Production Biofuel Biofuel And Biomass Resources Biotechnology Biotechnology Industry Engineering Material Environmental Issues Enzymatic Pretreatment Enhanced Methane Yields Enzymes Fuel Processing Industry Heat Treatment Higher Methane Yields Industrial Processes Low Energy Demand Enzymatic Low Energy Demand Pretreatments Low-temperature Thermo-alkaline Pretreatments Lower Methane Production Methane-rich Biogas Microalgae AD Microorganisms Photosynthesis And Bioenergy Conversion Pretreatment Temperature Product And Commodities Renewable Energy Evaluation Renewable Material Thermo-alkaline Pretreatment Improved Methane Yields |
Content Type | Text |
Resource Type | Article |
Subject | Renewable Energy, Sustainability and the Environment |
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