Characterization of the dewaterability of excess aerobic granular sludge

  • Aerobic granular \(\underline {sludge}\) technology has emerged as a promising \(\underline {wastewater}\) \(\underline {treatment}\) \(\underline {process}\). However, downstream granular \(\underline {sludge}\) \(\underline {management}\) framework is still challenging and lacks sufficient scientific coverage. This research aims to elucidate the dewatering characteristics of aerobic granular sludge compared to \(\underline {activated}\) \(\underline {sludge}\). Several parameters, such as zeta potential, specific resistance to filtrate, capillary suction time, bound water content, and rheological behavior, were employed to obtain a comprehensive understanding of the dewatering capability of targeted sludge types. The results indicate that aerobic granular sludge has a higher demand for \(\underline {flocculant}\) polymer than activated sludge (1.07 - 3.40 times). Additionally, aerobic granular sludge demonstrates higher resistance to filtrate (1.22 \(\pm\) 0.09 - 6.59 \(\pm\) 0.36 ×10\(^{11}\) m/kg) compared to activated sludge (2.93 \(\pm\) 0.09 ×10\(^{9}\) m/kg). The resistance to filtrate was shown to be positively associated with the average granules size. The usage of flocculant polymer significantly reduced the resistance to filtrate of all targeted samples. The bound water content of granular sludge (1.83 \(\pm\) 0.37 - 4.31 \(\pm\) 0.15 g/g TS) was higher than that of activated sludge (0.75 \(\pm\) 0.13 g/g TS). According to the rheological data, aerobic granular sludge has a slightly higher apparent viscosity than activated sludge. The results of this study provide valuable insights into the potential implications of aerobic granular sludge dewatering at full-scale applications.

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Author:Salahaldeen DababatGND, Stephan BerzioGND, Marc WichernORCiDGND, Manfred LübkenORCiDGND
Parent Title (English):Environmental technology & innovation
Publisher:Elsevier B.V.
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2024/03/11
Date of first Publication:2023/12/25
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:Open Access Fonds
Aerobic granular sludge; Dewatering; Rheology; Zeta potential
Issue:Artikel 103503
First Page:103503-1
Last Page:103503-14
Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum.
Institutes/Facilities:Lehrstuhl für Siedlungswasserwirtschaft und Umwelttechnik
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurbau, Umwelttechnik
open_access (DINI-Set):open_access
faculties:Fakultät für Bau- und Umweltingenieurwissenschaften
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International