Features of aerobic granular sludge formation treating fluctuating industrial saline wastewater at pilot scale.
J Environ Manage
; 296: 113135, 2021 Oct 15.
Article
in En
| MEDLINE
| ID: mdl-34229140
ABSTRACT
A pilot-scale sequencing batch reactor, with a working volume of 3 m3, was installed in a fish cannery to develop aerobic granular sludge treating the produced effluents. Depending on the nitrogen (N) and organic matter (COD) concentration, the effluents were named in this study as medium-low-strength (Stage I) and high-strength (Stage II) wastewater. The composition of the wastewater was found to be a crucial factor to select granule-forming organisms. With medium-low-strength wastewater as feeding, the first granules were observed after 30 days, but the extremely high COD/N ratios of the wastewater provoked the overgrowth of filamentous bacteria after 4 months of operation (Stage I). When treating high-strength wastewater, stable aggregates with good settleability appeared, but well-shaped granules were not observed since the granulation process was not completed. The system was able to remove both COD (70-95%) and N (30-90%) treating both types of effluents. Biomass growth was the main N removal pathway. The reactor was found to be robust against factory production stops and, thus, a suitable alternative to treat wastewater from industries with discontinuous operation.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sewage
/
Wastewater
Limits:
Animals
Language:
En
Journal:
J Environ Manage
Year:
2021
Type:
Article