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Recycling algae to improve species control and harvest efficiency from a high rate algal pond
 
Informations principales
Titre: Recycling algae to improve species control and harvest efficiency from a high rate algal pond
Type de l'élément: Publication
Résumé: This paper investigates the influence of recycling gravity harvested algae on species dominance and harvest efficiency in wastewater treatment High Rate Algal Ponds (HRAP). Two identical pilot-scale HRAPs were operated over one year either with (HRAPr) or without (HRAPc) harvested algal biomass recycling. Algae were harvested from the HRAP effluent in algal settling cones (ASCs) and harvest efficiency was compared to settlability in Imhoff cones five times a week. A microscopic image analysis technique was developed to determine relative algal dominance based on biovolume and was conducted once a month. Recycling of harvested algal biomass back to the HRAPr maintained the dominance of a single readily settleable algal species (Pediastrum sp.) at >90% over one year (compared to the control with only 53%). Increased dominance of Pediastrum sp. greatly improved the efficiency of algal harvest (annual average of >85% harvest for the HRAPr compared with ∼60% for the control). Imhoff cone experiments demonstrated that algal settleability was influenced by both the dominance of Pediastrum sp. and the species composition of remaining algae. Algal biomass recycling increased the average size of Pediastrum sp. colonies by 13–30% by increasing mean cell residence time. These results indicate that recycling gravity harvested algae could be a simple and effective operational strategy to maintain the dominance of readily settleable algal species, and enhance algal harvest by gravity sedimentation.
Lien internet:
Auteur(s): J.B.K. Park, R.J. Craggs, A.N. Shilton
Date: 16/12/2011
Référence: Water Research Volume 45, Issue 20, 15 December 2011, Pages 6637-6649
Mots clés: Algae; Biofuels; High rate algal ponds; Wastewater treatment; Algal harvest; Algal species control; Algal recycling
Texte

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