Features of aerobic granular sludge formation treating fluctuating industrial saline wastewater at pilot scale

被引:20
作者
Carrera, P. [1 ]
Casero-Diaz, T. [2 ]
Castro-Barros, C. M. [2 ]
Mendez, R. [1 ]
Val del Rio, A. [1 ]
Mosquera-Corral, A. [1 ]
机构
[1] Univ Santiago Compostela, CRETUS Inst, Dept Chem Engn, E-15782 Santiago De Compostela, Spain
[2] Cetaqua Galician Water Res Ctr Fdn, Emprendia Bldg,Campus Vida, E-15782 Santiago De Compostela, Spain
关键词
Aerobic granular sludge; Pilot scale; Industrial wastewater; Saline wastewater; Discontinuous operation; SEQUENCING BATCH REACTOR; TECHNOLOGY; STABILITY; OPERATION; SELECTION; EFFLUENT; NITROGEN; REMOVAL; GROWTH;
D O I
10.1016/j.jenvman.2021.113135
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A pilot-scale sequencing batch reactor, with a working volume of 3 m(3), 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.
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页数:9
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