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Performance and kinetics of algal-bacterial photobioreactor (AB-PBR) treating septic tank effluent.

Authors :
Chawalit Chaiwong
Thammarat Koottatep
Surinkul, Nawatch
Chongrak Polprasert
Source :
Water Science & Technology. 2018, Vol. 78 Issue 11, p2355-2363. 9p.
Publication Year :
2018

Abstract

Septic tank effluent contains high organic and nutrient contents. This study aimed to evaluate treatment performance of an algal-bacterial photobioreactor (AB-PBR) treating the septic tank effluent. The experimental unit employed a transparent plastic medium made from recycled drinking water bottles for attached-growth biofilm. Red LED lamp (light intensity ~100 μmol/m²/s) was applied as an energy source for the growth of algal-bacterial biofilm in the AB-PBR. The experimental results showed that AB-PBR operated at the hydraulic retention time (HRT) of 3 days gave the highest chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal efficiencies of 64, 45 and 35%, respectively, by which the effluent COD concentrations could meet the effluent standards of Thailand, but the effluent TN and TP concentrations needed to be further removed. The Stover-Kincannon model was applied to determine the kinetic values of COD and TN removals with R² values greater than 0.8. Microbiological examinations indicated Chlorella sp. is the predominant algal species growing in the AB-PBR, while the amplicon sequencing information analytical results revealed the bacterial phylum of Proteobacteria to be the predominant bacterial group. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02731223
Volume :
78
Issue :
11
Database :
Academic Search Index
Journal :
Water Science & Technology
Publication Type :
Academic Journal
Accession number :
134395620
Full Text :
https://doi.org/10.2166/wst.2018.519