Impact of coagulant and flocculant addition to an anaerobic dynamic membrane bioreactor (AnDMBR) treating waste-activated sludge

Title

Impact of coagulant and flocculant addition to an anaerobic dynamic membrane bioreactor (AnDMBR) treating waste-activated sludge

 Author

Kooijman, G. (TU Delft Sanitary Engineering)
Lopes, Wilton (Bairro Universitario)
Zhou, Z. (Sun Yat-sen University)
Guo, H. (TU Delft Sanitary Engineering) ORCID 0000-0001-8315-2883
de Kreuk, M.K. (TU Delft Sanitary Engineering) ORCID 0000-0002-5111-9461
Spanjers, H. (TU Delft Sanitary Engineering) ORCID 0000-0002-9035-9417
van Lier, J.B. (TU Delft Sanitary Engineering) ORCID 0000-0003-2607-5425

 Date

2017-06-01

 Abstract

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.


 Subject

Anaerobic digestion
AnDMBR
Flocculant
Membrane fouling reducer
Viscosity

 To reference this document use:

http://resolver.tudelft.nl/uuid:b63b663b-c6af-450b-ae3a-5b2f8c4d0335

 DOI

https://doi.org/10.3390/membranes7020018

 ISSN

2077-0375

 Source

Membranes, 7 (2)

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2017 G. Kooijman, Wilton Lopes, Z. Zhou, H. Guo, M.K. de Kreuk, H. Spanjers, J.B. van Lier
Files
PDF membranes_07_00018.pdf 881.05 KB
Close viewer