Nutrient utilization and oxygen production by Chlorella vulgaris in a hybrid membrane bioreactor and algal membrane photobioreactor system

Y. Najm, S. Jeong, T.O. Leiknes
Bioresource Technology, volume 237, pp. 64-71, (2017)

Nutrient utilization and oxygen production by Chlorella vulgaris in a hybrid membrane bioreactor and algal membrane photobioreactor system

Keywords

Algae, Membrane bioreactor, Membrane photobioreactor, Nutrients, Specific oxygen production

Abstract

This work studied oxygen production and nutrient utilization by Chlorella vulgaris at different organic/inorganic carbon (OC/IC) and ammonium/nitrate (NH4+-N/NO3-N) ratios to design a hybrid aerobic membrane bioreactor (MBR) and membrane photobioreactor (MPBR) system. Specific oxygen production by C. vulgaris was enough to support the MBR if high growth is accomplished. Nearly 100% removal (or utilization) of PO43-P and IC was achieved under all conditions tested. Optimal growth was achieved at mixotrophic carbon conditions (0.353 d−1) and the highest NH4+-N concentration (0.357 d−1), with preferable NH4+-N utilization rather than NO3-N. The results indicate the potential of alternative process designs to treat domestic wastewater by coupling the hybrid MBR – MPBR systems.

Code

DOI: 10.1016/j.biortech.2017.02.057

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