Influences of mechanical pretreatment on the non-biological treatment of municipal wastewater by forward osmosis

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Abstract

Municipal wastewater treatment involves mechanical, biological and chemical treatment steps for protecting the environment from adverse effects. The biological treatment step consumes the most energy and can create greenhouse gases. This study investigates municipal wastewater treatment without the biological treatment step, including the effects of different pretreatment configurations, for example, direct membrane filtration before forward osmosis. Forward osmosis was tested using raw wastewater and wastewater subjected to different types of mechanical pretreatment, for example, microsieving and microfiltration permeation, as a potential technology for municipal wastewater treatment. Forward osmosis was performed using Aquaporin Inside™ and Hydration Technologies Inc. (HTI) membranes with NaCl as the draw solution. Both types of forward osmosis membranes were tested in parallel for the different types of pretreated feed and evaluated in terms of water flux and solute rejection, that is, biochemical oxygen demand (BOD7) and total and soluble phosphorus contents. The Aquaporin and HTI membranes achieved a stable water flux with rejection rates of more than 96% for BOD7 and total and soluble phosphorus, regardless of the type of mechanical pretreated wastewater considered. This result indicates that forward osmosis membranes can tolerate exposure to municipal waste water and that the permeate can fulfil the Swedish discharge limits.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • VA Syd
  • Sweden Water Research AB
  • Aquaporin A/S
  • Technical University of Denmark
  • University of Maribor
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Vattenbehandling

Nyckelord

Originalspråkengelska
Sidor (från-till)2295-2304
TidskriftEnvironmental Technology
Volym38
Utgåva nummer18
Tidigt onlinedatum2016 nov 24
StatusPublished - 2017 sep 17
PublikationskategoriForskning
Peer review utfördJa