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ABSTRACT
This paper evaluated the optimization of natural flocculant in different conditions in a tubular photobioreactor using swine wastewater effluent as culture media in a pilot-scale microalgae production plant. This study aimed to assess the flocculation efficiency of Tanfloc SG via a central composite design (CCD), with varying Tanfloc SG concentration, biomass concentration and pH. Subsequently, the microalga Acutodesmus obliquus was cultivated in medium obtained from the recycled recovery of microalgae cells via flocculation with Tanfloc SG. Results showed that the recycled medium after flocculation with Tanfloc SG had a positive effect on the biomass and lipid production of A. obliquus.
Nomenclature
| BC | = | Biomass concentration |
| CCD | = | Central composite design |
| OD | = | Optical density |
| NPDEAS | = | Núcleo de Núcleo de Pesquisa e Desenvolvimento de Energia Autossustentável |
| TOC | = | Total organic carbon (mg/L) |
| TN | = | Total nitrogen (mg/L) |
| TC | = | Tanfloc concentration |
| ηf | = | Flocculation efficiency (%) |
Funding
The authors acknowledge with gratitude the support of the Brazilian National Council of Scientific and Technological Development, CNPq (projects 454669/2014-3 407204/2013-0, 407198/2013-0, 403560/2013-6, 482336/2012-9, 485058/2012-0, 504625/2010-1, 558835/2010-4, 574759/2008-5), TANAC and of NILKO Technology, Ltd. They also thank the Federal University of Paraná for infrastructural support.