Evaluation of direct membrane filtration and direct forward osmosis as concepts for compact and energy-positive municipal wastewater treatment

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Municipal wastewater treatment commonly involves mechanical, biological and chemical treatment steps to protect humans and the environment from adverse effects. Membrane technology has gained increasing attention as an alternative to conventional wastewater treatment due to increased urbanization. Among the available membrane technologies, microfiltration (MF) and forward osmosis (FO) have been selected for this study due to their specific characteristics, such as compactness and efficient removal of particles. In this study, two treatment concepts were evaluated with regard to their specific electricity, energy and area demands. Both concepts would fulfil the Swedish discharge demands for small- and medium-sized wastewater treatment plants at full scale: (1) direct MF and (2) direct FO with seawater as the draw solution. The framework of this study is based on a combination of data obtained from bench- and pilot-scale experiments applying direct MF and FO, respectively. Additionally, available complementary data from a Swedish full-scale wastewater treatment plant and the literature were used to evaluate the concepts in depth. The results of this study indicate that both concepts are net positive with respect to electricity and energy, as more biogas can be produced compared to that using conventional wastewater treatment. Furthermore, the specific area demand is significantly reduced. This study demonstrates that municipal wastewater could be treated in a more energy- and area-efficient manner with techniques that are already commercially available and with future membrane technology.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • VA Syd
  • Aquaporin A/S
  • Aalborg University
  • Technical University of Denmark
  • University of Maribor
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Vattenbehandling

Nyckelord

Originalspråkengelska
Sidor (från-till)264-276
TidskriftEnvironmental Technology
Volym39
Utgåva nummer3
Tidigt onlinedatum2017 mar 14
StatusPublished - 2018 feb
PublikationskategoriForskning
Peer review utfördJa