Large-sized aerobic granular biofilm: stable biotechnology to improve nitrogen removal and reduce sludge yield

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-04-14 DOI:10.1016/j.biortech.2025.132543

Haibo Ma , Sihao Chen , Linhuan Lv , Zhou Ye , Jiaqi Yang , Binbin Wang , Jinte Zou , Jun Li , Ramon Ganigué

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Abstract

Three parallel sequencing batch reactors (control, small-sized polyurethane sponge (PUS) (3.0 mm), and large-sized PUS (10.0 mm)) were used to investigate aerobic granular biofilm (AGB) characteristics. Results show that 10.0 mm PUS facilitated rapid formation of large-sized AGB (AGB_L), which exhibited higher biomass concentration (8.5 g/L) and faster settling velocity (69.2–159.3 m/h) than aerobic granular sludge (AGS) (3.2 g/L and 38.6–80.0 m/h). The AGB_L system also maintained long-term structural stability with a lower instability coefficient (0.004–0.018 min⁻¹) than AGS (0.053–0.090 min⁻¹). Additionally, during long-term operation, the AGB_L system achieved excellent removal efficiencies for NH₄⁺-N (99.6 ± 0.4 %) and total nitrogen (92.3 ± 2.6 %), and exhibited a lower sludge yield (0.05 gVSS/gCOD) than AGS (0.14 gVSS/gCOD). The larger size and compact structure of AGB_L increased anoxic/anaerobic zones, enriching denitrifying and hydrolytic/fermentative bacteria. These findings highlight AGB_L with large PUS as a more promising biotechnology for practical applications than conventional AGS.

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大型好氧颗粒生物膜：稳定的生物技术，提高氮的去除，降低污泥产量

采用平行测序间歇式反应器（对照、小尺寸聚氨酯海绵（PUS）（3.0 mm）和大尺寸聚氨酯海绵（PUS）（10.0 mm））研究好氧颗粒生物膜（AGB）特性。结果表明：与好氧颗粒污泥（AGS）（3.2 g/L和38.6 ~ 80.0 m/h）相比，10.0 mm PUS有利于大颗粒污泥（AGBL）的快速形成，其生物量浓度（8.5 g/L）更高，沉降速度（69.2 ~ 159.3 m/h）更快；AGBL系统也保持了长期的结构稳定性，其失稳系数（0.004-0.018 min−1）低于AGS （0.053-0.090 min−1）。此外，在长期运行过程中，AGBL系统对NH4+-N（99.6±0.4%）和总氮（92.3±2.6%）的去除率较高，污泥产率（0.05 gVSS/gCOD）低于AGS （0.14 gVSS/gCOD）。AGBL较大的尺寸和紧凑的结构增加了缺氧/厌氧区，丰富了反硝化和水解/发酵细菌。这些发现突出了具有大pu的AGBL是比传统AGS更有前景的实际应用生物技术。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.