Influence of temperature in phosphate removal by microalgae in heterotrophic bioreactors

  • Juliana Guerra Vieira FURG
  • Eduardo Jacob-Lopes Universidade Federal de Santa Maria (UFSM)
  • Adriana Gonçalves da Silva Manetti 1Escola de Química e Alimentos, Universidade Federal do Rio Grande (FURG), Rio Grande, RS
  • Maria Isabel Queiroz FURG
Keywords: microalgae, heterotrophic bioreactor, phosphate, dairy processing wastewater

Abstract

The removal of total dissolved phosphate by the cyanobacteria Aphanothece microscopica Nägeli cultivated heterotrophically in dairy processing wastewater was investigated in this work. The experiments were carried out in bioreactors operating in a batch mode, fed with 4.5 L of wastewater. The experimental conditions were as follows: initial cell concentration of 0.2 g/L, pH adjusted to 7.6, isothermal reactor operating at temperatures of 10, 20 and 30ºC with absence of light and continuous aeration of 1 VVM. The results showed that phosphate removal is strongly dependent on process temperature. A. microscopica Nägeli was effective in the removal phosphate achieving removal rates of 3.77 mg/L.h, which reflected in the conversion of 98.4% in hydraulic detention times of 24 h.

Author Biographies

Juliana Guerra Vieira, FURG
Chemical and Food School - FURG
Eduardo Jacob-Lopes, Universidade Federal de Santa Maria (UFSM)
Rural Science Center - UFSM
Adriana Gonçalves da Silva Manetti, 1Escola de Química e Alimentos, Universidade Federal do Rio Grande (FURG), Rio Grande, RS
Possui graduação em Engenharia de Alimentos pela Universidade Federal do Rio Grande - FURG (2006). Mestre em Engenharia e Ciência de Alimentos (2008). Doutoranda em Engenharia e Ciência de Alimentos, bolsista CNPq Projeto MCT/CNPq - 027/2007. Vem trabalhando na Área de Biotecnologia no isolamento, cultivo e crescimento de microalga, produção de compostos celulares por cianobactéra, como proteína unicelular, lipideos e carboidratos, cultivadas em efluentes da industria de alimentos. (Texto informado pelo autor)
Maria Isabel Queiroz, FURG
Chemical and Food School - FURG
Published
24/08/2012
Section
Papers