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Membranes 2017, 7(2), 18;

Impact of Coagulant and Flocculant Addition to an Anaerobic Dynamic Membrane Bioreactor (AnDMBR) Treating Waste-Activated Sludge

Department of Watermanagement, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628BC Delft, The Netherlands
Department of Sanitary and Environmental Engineering, University of Paraiba State, Avenida Juvencio Arruda SN, Bairro Universitario, Campina Grande, Paraíba 58429-500, Brazil
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Author to whom correspondence should be addressed.
Academic Editor: Baoqiang Liao
Received: 23 January 2017 / Revised: 12 March 2017 / Accepted: 15 March 2017 / Published: 23 March 2017
(This article belongs to the Special Issue Anaerobic Membrane Bioreactors)
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In this work, we investigated the effects of flocculation aid (FA) addition to an anaerobic dynamic membrane bioreactor (AnDMBR) (7 L, 35 °C) treating waste-activated sludge (WAS). The experiment consisted of three distinct periods. In period 1 (day 1–86), the reactor was operated as a conventional anaerobic digester with a solids retention time (SRT) and hydraulic retention time (HRT) of 24 days. In period 2 (day 86–303), the HRT was lowered to 18 days with the application of a dynamic membrane while the SRT was kept the same. In period 3 (day 303–386), a cationic FA in combination with FeCl3 was added. The additions led to a lower viscosity, which was expected to lead to an increased digestion performance. However, the FAs caused irreversible binding of the substrate, lowering the volatile solids destruction from 32% in period 2 to 24% in period 3. An accumulation of small particulates was observed in the sludge, lowering the average particle size by 50%. These particulates likely caused pore blocking in the cake layer, doubling the trans-membrane pressure. The methanogenic consortia were unaffected. Dosing coagulants and flocculants into an AnDMBR treating sludge leads to a decreased cake layer permeability and decreased sludge degradation. View Full-Text
Keywords: AnDMBR; flocculant; membrane fouling reducer; viscosity; anaerobic digestion AnDMBR; flocculant; membrane fouling reducer; viscosity; anaerobic digestion

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kooijman, G.; Lopes, W.; Zhou, Z.; Guo, H.; de Kreuk, M.; Spanjers, H.; van Lier, J. Impact of Coagulant and Flocculant Addition to an Anaerobic Dynamic Membrane Bioreactor (AnDMBR) Treating Waste-Activated Sludge. Membranes 2017, 7, 18.

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