Harvesting microalgae grown on wastewater
| Autor: | Sarina J. Ergas, Trina Halfhide, Omatoyo K. Dalrymple, Qiong Zhang, Behnaz H. Zaribaf, Benjamin Gilliea, Innocent Udoma |
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| Rok vydání: | 2013 |
| Předmět: |
Greenhouse Effect
Environmental Engineering Cell Culture Techniques Photobioreactor Bioengineering Aquaculture Wastewater Biology Waste Disposal Fluid Chloride Photobioreactors chemistry.chemical_compound Electricity Algae Bioenergy Microalgae medicine Waste Management and Disposal Renewable Energy Sustainability and the Environment Alum General Engineering Environmental engineering Flocculation General Medicine Pulp and paper industry biology.organism_classification chemistry Biofuel Costs and Cost Analysis Environmental science Thermodynamics Ferric medicine.drug |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2013.04.002 |
| Popis: | The costs and life cycle impacts of microalgae harvesting for biofuel production were investigated. Algae were grown in semi-continuous culture in pilot-scale photobioreactors under natural light with anaerobic digester centrate as the feed source. Algae suspensions were collected and the optimal coagulant dosages for metal salts (alum, ferric chloride), cationic polymer (Zetag 8819), anionic polymer (E-38) and natural coagulants (Moringa Oleifera and Opuntia ficus-indica cactus) were determined using jar tests. The relative dewaterability of the algae cake was estimated by centrifugation. Alum, ferric chloride and cationic polymer could all achieve >91% algae recovery at optimal dosages. Life cycle assessment (LCA) and cost analysis results revealed that cationic polymer had the lowest cost but the highest environmental impacts, while ferric chloride had the highest cost and lowest environmental impacts. Based on the LCA results, belt presses are the recommended algae dewatering technology prior to oil extraction. |
| Databáze: | OpenAIRE |
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