| Title |
A semi-continuous algal-bacterial wastewater treatment process coupled with bioethanol production |
| ID_Doc |
12220 |
| Authors |
Papadopoulos, KP; Economou, CN; Stefanidou, N; Moustaka-Gouni, M; Genitsaris, S; Aggelis, G; Tekerlekopoulou, AG; Vayenas, DV |
| Title |
A semi-continuous algal-bacterial wastewater treatment process coupled with bioethanol production |
| Year |
2023 |
| Published |
|
| DOI |
10.1016/j.jenvman.2022.116717 |
| Abstract |
Harnessing the biomass energy potential through biofuel production offers new outlets for a circular economy. In this study an integrated system which combine brewery wastewater treatment using algal-bacterial aggregates instead of activated sludge was developed. The use of algal-bacterial aggregates can eliminate the aeration re-quirements and significantly reduce the high biomass harvesting costs associated with algal monocultures. A sequencing batch reactor (SBR) setup operating with and without biomass recirculation was used to investigate pollutant removal rates, aggregation capacity and microbial community characteristics under a range of hy-draulic retention times (HRTs) and solid retention times (SRTs). It was observed that biomass recirculation strategy significantly enhanced aggregation and pollutant removal (i.e., 78.7%, 94.2% and 75.2% for d-COD, TKN, and PO43--P, respectively). The microbial community established was highly diverse consisting of 161 Bacterial Operational Taxonomic Units (B-OTUs) and 16 unicellular Eukaryotic OTUs (E-OTUs). Escalation the optimal conditions (i.e., HRT = 4 d, SRT = 10 d) at pilot-scale resulted in nutrient starvation leading to 38-44% w/w carbohydrate accumulation. The harvested biomass was converted to bioethanol after acid hydrolysis followed by fermentation with Saccharomyces cerevisiae achieving a bioethanol production yield of 0.076 g bioethanol/g biomass. These data suggest that bioethanol production coupled with high-performance waste-water treatment using algal-bacterial aggregates is feasible, albeit less productive concerning bioethanol yields than systems exclusively designed for third and fourth-generation biofuel production. |
| Author Keywords |
Filamentous cyanobacteria; Brewery wastewater; Pilot scale; Biomass hydrolysis; Saccharomyces cerevisiae; Bioethanol production |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000889841800006 |
| WoS Category |
Environmental Sciences |
| Research Area |
Environmental Sciences & Ecology |
| PDF |
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