Influence of sequencing batch reactor configuration on aerobic granules growth: Engineering and microbiological aspects

JOURNAL OF CLEANER PRODUCTION

卷:238

Article

de Sousa Rollemberg, Silvio Luiz¹  Mendes Barros, Antonio Ricardo¹  Machado de Lima, Joao Pedro¹  Santos, Amanda Ferreira¹  Milen Firmino, Paulo Igor¹  dos Santos, Andre Bezerra¹ 

[1] Univ Fed Ceara, Dept Hydraul & Environm Engn, Fortaleza, Ceara, Brazil

关键词: Aerobic granular sludge;    Conventional SBR;    Constant-volume SBR;    Simultaneous fill-and-draw mode;    SBR configuration;   

DOI  :  10.1016/j.jclepro.2019.117906

来源: Elsevier

【 摘 要 】

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 (empty set > 1 mm) and better settleability (SVI30 approximate to 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 (empty set approximate to 0.8 mm) and a worse settleability (SVI30 approximate to 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 (approximate to 50%) than in R1 (approximate to 25%). The results justify the use of SBRs operated at constant volume in most full-scale AGS wastewater treatment plants, such as Nereda (R). 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. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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