The effects of physicochemical wastewater treatment operations on forward osmosis

Raw municipal wastewater from a full-scale wastewater treatment plant was physicochemically pretreated in a large pilot-scale system comprising coagulation, flocculation, microsieve and microfiltration operated in various configurations. The produced microsieve filtrates and microfiltration permeate...

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Bibliographic Details
Published in:Environmental technology 2017-09, Vol.38 (17), p.2130-2142
Main Authors: Hey, Tobias, Bajraktari, Niada, Vogel, Jörg, Hélix Nielsen, Claus, la Cour Jansen, Jes, Jönsson, Karin
Format: Article
Language:English
Subjects:
Biochemical oxygen demand
Civil Engineering
Coagulation
Engineering and Technology
Filtrate
Flocculation
Fluctuations
Flux
Forward osmosis
Membranes
Membranes, Artificial
Microfiltration
microsieve
Municipal wastewater
non-biological treatment
Osmosis
Phosphorus
physicochemical pretreatment
Pretreatment
Pretreatment of water
Samhällsbyggnadsteknik
Sodium chloride
Teknik
Thin films
Vattenteknik
Waste Water
Wastewater treatment
Wastewater treatment plants
Water Engineering
Water Purification
Water treatment plants
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Summary:Raw municipal wastewater from a full-scale wastewater treatment plant was physicochemically pretreated in a large pilot-scale system comprising coagulation, flocculation, microsieve and microfiltration operated in various configurations. The produced microsieve filtrates and microfiltration permeates were then concentrated using forward osmosis (FO). Aquaporin Inside TM FO membranes were used for both the microsieve filtrate and microfiltration permeates, and Hydration Technologies Inc.-thin-film composite membranes for the microfiltration permeate using only NaCl as the draw solution. The FO performance was evaluated in terms of the water flux, water flux decline and solute rejections of biochemical oxygen demand, and total and soluble phosphorus. The obtained results were compared with the results of FO after only mechanical pretreatment. The FO permeates satisfied the Swedish discharge demands for small and medium-sized wastewater treatment plants. The study demonstrates that physicochemical pretreatment can improve the FO water flux by up to 20%. In contrast, the solute rejection decreases significantly compared to the FO-treated wastewater with mechanical pretreatment.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2016.1246616