Application of Physicochemical Treatment Allows Reutilization of Arthrospira platensis Exhausted Medium An Investigation of Reusing Medium in Arthrospira platensis Cultivation

Author(s)

Mejia-da-Silva, Lauris del Carmen ^[1] ; Matsudo, Marcelo Chuei ^[2] ; Morocho-Jacome, Ana Lucia ^[1] ; Monteiro de Carvalho, Joao Carlos ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Pharmaceut Sci, Dept Biochem & Pharmaceut Technol, Sao Paulo - Brazil

^[2] Univ Fed Itajuba, Inst Nat Resources, Itajuba - Brazil

• Document type: Journal article
• Source: Applied Biochemistry and Biotechnology; v. 186, n. 1, p. 40-53, SEP 2018.
• Web of Science Citations: 0

Abstract

Since cultivations of Arthrospira platensis have a high water demand, it is necessary to develop treatment methods for reusing the exhausted medium that may prevent environmental problems and obtaining useful biomass. The exhausted Schlosser medium obtained from A. platensis batch cultivation in bench-scale mini-tanks was treated by varying concentrations of different coagulants, ferric chloride (6, 10, and 14 mg L-1) or ferric sulfate (15, 25, and 35 mg L-1) and powdered activated carbon (PAC, 30 and 50 mg L-1). Such treated effluent was restored with NaNO3 and reused in new cultivations of A. platensis performed in Erlenmeyer flasks. Reusing media through the cultivation of A. platensis showed satisfactory results, particularly in the medium treated with ferric chloride and PAC. The maximum cell concentration obtained in the flasks was 1093 mg L-1, which corresponded to the medium treated with ferric chloride (6 mg L-1) and PAC (30 mg L-1). This cellular growth was higher than in the medium treated with ferric sulfate and PAC, in which values of maximum cell concentration did not exceed 796 mg L-1. The cultures in the media after treatment did not modify the biomass composition. Thus, combined coagulation/adsorption processes, commonly used in water treatment processes, can be efficient and viable for treating exhausted medium of A. platensis, allowing the production of such biomass with the reduction of production cost and saving water. (AU)

• FAPESP's process: 12/08883-6 - Reuse of exhausted medium from Arthrospira (Spirulina) platensis after treatment with powdered activated carbon and different coagulants.
• Grantee: Lauris Del Carmen Mejia da Silva
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 11/52028-0 - Reuse of the culture medium of Arthrospira platensis using physical-chemical treatments
• Grantee: João Carlos Monteiro de Carvalho
• Support Opportunities: Regular Research Grants