Cultivation of flocculated microalgal-bacterial consortia using fluidised carriers for wastewater treatment and renewable energy production.

Bioresour Technol

Water Reclamation Technology Department, R&D Center, METAWATER Co., Ltd., JR Kanda Manseibashi Bldg. 1-25, Kanda-sudacho, Chiyoda-ku, Tokyo 1010041, Japan.

Published: September 2024

AI Article Synopsis

  • This study explores how to cultivate microalgal-bacterial consortia (MBC) and microalgal consortia (MC) using treated wastewater, focusing on techniques for flocculating these suspended cultures.
  • Flocculation is achieved by managing the replacement of carriers and cultures to minimize organic residues, leading to better settlement of the cultures.
  • The findings suggest that using MBC grown on fluidised carriers in primary treated wastewater can be an effective method for renewable energy production.

Article Abstract

Microalgal-bacterial consortia (MBC) and microalgal consortia (MC) were cultivated with primary and final treated wastewaters, respectively, using a fluidised carrier. This study determines the main factors and operations required for flocculating suspended MBC (SMBC) and MC (SMC) in cultures. The flocculated SMBC and SMC with good settleability require the detachment of thickened MBC or MC on the carrier and suppressed SMBC and SMC formation by the original MBC and MC grown in the culture. Flocculation was achieved by controlling the carrier and culture replacements. A carrier replacement ratio of 0.04 d and a culture replacement ratio of 0.95 d minimised the dissolved organic carbon (15.3 mg-C/L) and SMBC residue (7.3 mg/L). Thus, treating primary treated wastewater with MBC formed using fluidised carriers is a promising strategy, enabling the use of whole cells in MBC for renewable energy production.

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Source
http://dx.doi.org/10.1016/j.biortech.2024.131219DOI Listing

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