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

Guido Kooijman, Wilton Lopes, Zhongbo Zhou, Hongxiao Guo, Merle de Kreuk, Henri Spanjers, Jules van Lier

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
48 Downloads (Pure)

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.

Original languageEnglish
Article number18
Number of pages11
JournalMembranes
Volume7
Issue number2
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • Anaerobic digestion
  • AnDMBR
  • Flocculant
  • Membrane fouling reducer
  • Viscosity

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