Madsen, Henrik Tækker

Muff, Jens

Nikbakht Fini, Mahdi

English

Forward osmosis (FO) process has gained a critical attention in recent years due to its decreased energy requirements as well as less fouling risks. However, the challenge has been to find an FO membrane offering sufficient rejection of uncharged micropollutants while maintaining a reasonable water flux. Among FO membranes, by incorporating aquaporin proteins in the membrane selective layer, aquaporin membrane offers the possibility of having a high rejection without compromising water flux resulting in a higher permeability compared to the other traditional FO membranes. However, their potential for removal of micropollutant is not widely studied. In this study, the performance of the membrane was for the first time investigated in a conventional FO setup for removal of three frequently detected pesticides in groundwater wells in Denmark; 2-6 dichloro-benzamide (BAM), 2-methyl-4-chlorophenoxyaceticacid (MCPA), and methylchlorophenoxypropionic acid (MCPP). The aquaporin FO membrane was found to reject all targeted pesticides at initial levels over 93% for BAM and up to 97% for MCPP. The rejection of pesticides increased up to approximately 99% by the time. The permeate flux, in addition, was observed to be 15 LMH at the beginning and dropped down to around 13 LMH over time probably due to adsorption of solutes on the membrane. This can be stated by comparing the permeate flux for feed water (spiked with pesticides) with pure water in which permeate flux was observed to remain almost constant around 15 LMH.<br/

    Aalborg UniversitetBiomimetic aquaporin forward osmosis membrane for removal of frequently foundpesticides from danish groundwater networkNikbakht Fini, Mahdi; Madsen, Henrik Tækker; Muff, JensPublication date:2018Link to publication from Aalborg UniversityCitation for published version (APA):Nikbakht Fini, M., Madsen, H. T., & Muff, J. (2018). Biomimetic aquaporin forward osmosis membrane forremoval of frequently found pesticides from danish groundwater network. Abstract from Nordic FiltrationSymposium, Aalborg, Denmark.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: December 27, 2020BIOMIMETIC AQUAPORIN FORWARD OSMOSIS MEMBRANE FOR REMOVAL OF FREQUENTLY FOUND PESTICIDES FROM DANISH GROUNDWATER NETWORKMAHDI  N IKBAKHT FINI ,  HENRIK TÆKKER MADSEN,  JENS MUFFDEPARTMENT OF CHEMISTRY AND BIOSCIENCE                          SECTION OF CHEMICAL ENGINEERING2IntroductionActive drinking water wells (2012-2015)Concentration of pesticide residue: µg/l None  0.01-0.1  > 0.1•Found in 27% of activeDW wells•> 0.1 µg/L in 3.6%• 130 wells wereclosed within 1993-2009Map of pesticide contamination17th Nordic filtration symposium3Water teatment17th Nordic filtration symposiumBiofilter:Added specific pesticide degrader organisms to sand filtersMembrane separation:~ 90% ultra pure water~ 10% residual ‘waste’ water with high concentration of pollutants, carbon, minerals etc.Mineralization:Treated concentrate is mixed with permeateEllegaard-Jensen et al. 20174Studied pesticides17th Nordic filtration symposium1 . BAM (2 -6  D ich lo robenzamide )MW:  190 .028  g /mo lt rans fo rmat ion  p roduc t  o f  D ich loben i l2 .  MCPA (2 -methy l -4 -ch lo rophenoxyace t i c  ac id )  MW:  200 .62  g /mo l3 .  MCPP (methy l ch lo rophenoxyprop ion ic ac id )MW: 214 .65  g /mo lI n  2015 ,  Found  in  16%of  samp led  we l l s  o f  wh ich  9 .4% was  above  0 .1  µg /L .  5Forward Osmosis17th Nordic filtration symposiumAdvantages of FO process: Less energy requirements Less risk of fouling/scaling 6Use of FO in MEM2BIO project17th Nordic filtration symposium7Aquaporin FO membrane17th Nordic filtration symposium Incorporated aquaporin proteins in the membrane Higher permeability compared to traditional FO membranes34 cm2 2.3 m28FO setups17th Nordic filtration symposium9Membrane characterization17th Nordic filtration symposiumParameter ValueNaCl rejection in RO (%) 99.4 ± 0.2Pure water permeate flux (LMH) 15.2 ± 0.6Reverse salt flux (g m-2 h-1) 5.6 ± 0.5 (1.7 ± 0.4 by HF) Water permeability, A (L m-2 h-1 bar) 3.0 ± 0.2Salt permeability, B (L m-2 h-1) 0.1 ± 0.03Membrane structural parameter, S (µm) 305 ± 43Contact angle (˚) 28.6 ± 3.4Zeta potential at pH=5.3 (mV) - 21 ± 210Pesticides rejection in pure water17th Nordic filtration symposium121416182022868890929496981000 40 80 120 160 200 240 280Permeate Flux (LMH)Rejection (%)Time (min)BAM rejection MCPA rejection MCPP rejection Permeate flux•Feed 2  L ,  1  mg/L•Draw 200  mL,  1  M NaCl•F la t  shee t  membrane11Pesticides rejection in Varde water17th Nordic filtration symposium10121416182022242690929496981001020 50 100 150 200 250 300 350Permeate Flux (LMH)Rejection (%)Time (min)BAM MCPA MCPP Permeate flux•Feed  2  L ,  1  mg/L•Draw 200  mL,  1  M NaCl  •F la t  shee t  membrane12Pesticides rejection by different setups17th Nordic filtration symposiumBAM (%) MCPA (%) MCPP (%)Pure water permeate Flux (LMH)Hollow fiber 98.1 98.6 98.9 15.8Flat sheet 93.3 94.7 94.9 15.2Small FO compartment97.2 - - 9.4H. Madsen et. al., Journal of Membrane Science 476 (2015) 469–47413• Use of the other water samples from Kolding and Hvidovre.• Use of the other draw solutes: Glucose and Sodium acetate• Study of ef fect  of  recovery on the membrane performance. • Product ion of  concentrates for  b io logical  t reatment using di f ferent draw solutes• Comparison of RO and FO in terms of scal ing propensi ty• Combinat ion of  FO and RO as an integrated membrane process.Future work17th Nordic filtration symposium

Biomimetic aquaporin forward osmosis membrane for removal of frequently found pesticides from danish groundwater network

https://vbn.aau.dk/ws/files/287338190/Nikbakht.pdf

Biomimetic aquaporin forward osmosis membrane for removal of frequently found pesticides from danish groundwater network

Abstract

Similar works

Full text

Available Versions

VBN