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Examining sludge production in bioelectrochemical systems treating domestic wastewater.

Authors
  • Brown, Robert Keith1
  • Harnisch, Falk2
  • Dockhorn, Thomas3
  • Schröder, Uwe4
  • 1 Institute of Environmental and Sustainable Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany. , (Germany)
  • 2 Department of Environmental Microbiology, Helmholtz-Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany. , (Germany)
  • 3 Institute of Sanitary and Environmental Engineering, Technische Universität Braunschweig, Pockelsstr. 2a, 38106 Braunschweig, Germany. , (Germany)
  • 4 Institute of Environmental and Sustainable Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany. Electronic address: [email protected] , (Germany)
Type
Published Article
Journal
Bioresource technology
Publication Date
Dec 01, 2015
Volume
198
Pages
913–917
Identifiers
DOI: 10.1016/j.biortech.2015.09.081
PMID: 26442641
Source
Medline
Keywords
License
Unknown

Abstract

Sludge production in microbial bioelectrochemical systems (BES) was assessed in conjunction with anaerobic and aerobic control reactors. Effluent after primary settling tank (EAPS) and depleted EAPS spiked with acetate were treated. The reactors were loaded with total suspended solids (TSS) and chemical oxygen demand (COD) at average loading rates of 22 mg TSS d(-1)L(-1) and 86 mg COD d(-1)L(-1), respectively. Carbon cloth anode equipped BES reactors delivered the highest performance. They achieved on average a COD removal of 80%, a Coulomb efficiency of 77% for EAPS, a maximum current density of 39 μA cm(-)(3)/175 μA cm(-)(2) for EAPS and a TSS removal of 59%, yielding a sludge production of only 80 mg TSS per g ΔCOD. This study provides further evidence that BES can improve the economics of wastewater treatment via lower sludge production as well as providing a framework for understanding sludge production in BES.

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