title: Liquid-phase membrane extraction of targeted pesticides from manufacturing wastewaters in a hollow fibre contactor with feed-stream recycle.
abstract: A two-phase membrane extraction in a hollow fibre contactor with feed-stream recycle was applied to remove selected pesticides (tebufenozide, linuron, imidacloprid, acetamiprid and dimethoate) from their mixed aqueous solutions. The contactor consisted of 50 polypropylene hollow fibres impregnated with 5% tri-n-octylphosphine oxide in di-n-hexyl ether. For low-polar pesticides with log P ≥ 2 (tebufenozide and linuron), the maximum removal efficiency increased linearly from 85% to 96% with increasing the feed flow rate. The maximum removal efficiencies of more polar pesticides were significantly higher under feed recirculation (86%) than in a continuous single-pass operation (30%). It was found from the Wilson's plot that the mass transfer resistance of the liquid membrane can be neglected for low-polar pesticides. The pesticide removals from commercial formulations were similar to those from pure pesticide solutions, indicating that built-in adjuvants did not affect the extraction process.
authors.affiliation: a Laboratory of Physics , Vinča Institute of Nuclear Sciences, University of Belgrade , Belgrade , Serbia.
authors.forename: Jelena
authors.initials: J
authors.lastname: Đorđević
authors.affiliation: b Chemical Engineering Department , Loughborough University , Leicestershire , UK.
authors.forename: Goran T
authors.initials: GT
authors.lastname: Vladisavljević
authors.affiliation: a Laboratory of Physics , Vinča Institute of Nuclear Sciences, University of Belgrade , Belgrade , Serbia.
authors.forename: Tatjana
authors.initials: T
authors.lastname: Trtić-Petrović
mesh_terms: D004117:Dimethoate / Q000737:chemistry; D006834:Hydrazines / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry; D007220:Industrial Waste; D008044:Linuron / Q000737:chemistry; D059625:Liquid-Liquid Extraction; D008567:Membranes, Artificial; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000737:chemistry; D010575:Pesticides / Q000737:chemistry*; D011126:Polypropylenes / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry; D059027:Recycling; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D004117:Dimethoate; D006834:Hydrazines; D007093:Imidazoles; D007220:Industrial Waste; D008044:Linuron; D008567:Membranes, Artificial; D000073943:Neonicotinoids; D009574:Nitro Compounds; D009943:Organophosphorus Compounds; D010575:Pesticides; D011126:Polypropylenes; D011725:Pyridines; D062065:Wastewater; D014874:Water Pollutants, Chemical; C082359:imidacloprid; C464485:acetamiprid; C044965:trioctyl phosphine oxide; C082026:tebufenozide
keywords: Hollow fibre membrane contactor; liquid membrane; mass transfer resistance; pesticides; wastewater