Influence of sequencing batch reactor configuration on aerobic granules growth: Engineering and microbiological aspects
| Autor: | Paulo Igor Milen Firmino, Silvio Luiz de Sousa Rollemberg, João Pedro Machado de Lima, Amanda Ferreira dos Santos, Antônio Ricardo Mendes Barros, André Bezerra dos Santos |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Chemistry 020209 energy Strategy and Management 05 social sciences Granule (cell biology) System stability Sequencing batch reactor 02 engineering and technology Pulp and paper industry Industrial and Manufacturing Engineering Settling Decantation 050501 criminology 0202 electrical engineering electronic engineering information engineering Sewage treatment Operational stability 0505 law General Environmental Science |
| Zdroj: | Journal of Cleaner Production. 238:117906 |
| ISSN: | 0959-6526 |
| DOI: | 10.1016/j.jclepro.2019.117906 |
| Popis: | This work evaluated the effect of two sequencing batch reactor (SBR) configurations used for aerobic granular sludge (AGS) cultivation (conventional and constant-volume) on the physical and microbiological characteristics of the granules, as well as on the systems’ performance. In the conventional SBR (R1), the filling, reaction, settling and decanting phases occurred sequentially, while, in the SBR operated at constant volume (R2), the filling and decanting phases occurred simultaneously followed by the reaction and settling phases. A faster formation of granules (about 30 days) with a larger size (∅ > 1 mm) and better settleability (SVI30 ≈ 44.8 mL/g) was observed in R1. On the other hand, R2 presented a slower formation of granules (about 50 days) with a smaller diameter (∅ ≈ 0.8 mm) and a worse settleability (SVI30 ≈ 70.7 mL/g). Although R2 presented smaller granules (and longer time for biomass formation), this configuration presented several advantages, such as better system stability during the entire operation (125 days), higher solids retention, and granules with better physical resistance. In terms of performance, both systems presented high values of COD (>90%), NH4+ (>90%) and TN (>50%) removals after stabilization. However, the phosphorus removal in R2 was higher (≈50%) than in R1 (≈25%). The results justify the use of SBRs operated at constant volume in most full-scale AGS wastewater treatment plants, such as Nereda®. Therefore, the SBR configuration has a direct influence on the granule formation and its physical and microbiological characteristics as well as on the system performance in terms of efficiency and operational stability. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect