Technical potential of microalgal bacterial floc raceway ponds treating food-industry effluents while producing microalgal bacterial biomass: An outdoor pilot-scale study

[Display omitted] •Outdoor pilot-scale MaB-floc SBR raceway pond treating two food-industry effluents.•Upflow anaerobic sludge blanket (UASB), conventional activated sludge (CAS).•Photosynthetic aeration was sufficient for nitrification of UASB effluent.•Low phosphorus removal in pond treating CAS e...

Full description

Saved in:
Bibliographic Details
Published in:Bioresource technology 2016-10, Vol.218, p.969-979
Main Authors: Van Den Hende, Sofie, Beelen, Veerle, Julien, Lucie, Lefoulon, Alexandra, Vanhoucke, Thomas, Coolsaet, Carlos, Sonnenholzner, Stanislaus, Vervaeren, Han, Rousseau, Diederik P.L.
Format: Article
Language:English
Subjects:
Algae
Bioflocculation
Biomass
Food Industry
MaB-floc
Microalgae
Nitrification
Phosphorus
Photosynthesis
Pilot Projects
Ponds - microbiology
Sewage - chemistry
Waste Disposal, Fluid - methods
Wastewater
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •Outdoor pilot-scale MaB-floc SBR raceway pond treating two food-industry effluents.•Upflow anaerobic sludge blanket (UASB), conventional activated sludge (CAS).•Photosynthetic aeration was sufficient for nitrification of UASB effluent.•Low phosphorus removal in pond treating CAS effluent.•High biomass productivities of 24.9–31.3ton TSS hapond−1year−1. To replace costly mechanical aeration by photosynthetical aeration, upflow anaerobic sludge blanket (UASB) effluent of food-industry was treated in an outdoor MaB-floc raceway pond. Photosynthetic aeration was sufficient for nitrification, but the raceway effluent quality was below current discharge limits, despite the high hydraulic retention time (HRT) of 35days. Hereafter, conventional activated sludge (CAS) effluent of food-industry was treated in this pond to recover phosphorus. The two-day HRT results in a more realistic pond area, but the phosphorus removal efficiency was low (20%). High biomass productivities were obtained, i.e. 31.3 and 24.9ton total suspended solids hapond−1year−1 for UASB and CAS effluent, respectively. Bioflocculation enabled successful harvesting of CAS effluent-fed MaB-flocs by settling and filtering at 150–250μm to 22.7% total solids. To conclude, MaB-floc raceway ponds cannot be recommended as the sole treatment for these food-industry effluents, but huge potential lies in added-value biomass production.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.07.065