title: Membrane photoreactor treatment of 1,4-dioxane-containing textile wastewater effluent: Performance, modeling, and fouling control.
abstract: A membrane photoreactor (MPR) system was investigated for the purification of textile wastewater effluent containing 1,4-dioxane for potential reuse. The effects of TiO2 dosage, alkalinity, particulate matter, and sunlight radiation on the removal of 1,4-dioxane from the effluent were evaluated. The photocatalytic 1,4-dioxane degradation followed pseudo-first order reaction kinetics. A considerably large dose of TiO2 catalyst (5 g/L) was required for maximal 1,4-dioxane degradation by MPR. The high alkalinity (∼ 550 mg/L) of the textile wastewater effluent negatively affected the 1,4-dioxane degradation rate, whereas 1,4-dioxane degradation was not impacted by the presence of particulate matter. Solar photocatalysis of 1,4-dioxane was as effective as that achieved with UV lamps in the MPR, which could lead to energy savings. Continuous flow MPR was effective for continuous degradation of 1,4-dioxane; the unsteady- and steady-state performances were well-predicted at various hydraulic residence times (HRTs). The quality of the MPR product obtained at an HRT of 8.57 h satisfied the drinking water guidelines. The transmembrane pressure (TMP) buildup, which is indicative of fouling, was dependent on the TiO2 dose and permeate flux. The TMP buildup was marginal at low flux, but increased dramatically beyond a flux level of >60 L/m(2)-h. However, the fouling layer could be sufficiently removed by periodic backwashing, even at an extremely high flux of 100 L/m(2)-h. The membrane permeability was sustained without any sign of irreversible fouling during MPR treatment of textile wastewater effluents.
authors.affiliation: Institute of Health & Environment, Province of Gyeongsangbuk-do, 22 Gosugol-gil, Geumho-eup, Yeongcheon, Gyeongbuk 770-805, Republic of Korea.
authors.forename: Ki-Chang
authors.initials: KC
authors.lastname: Lee
authors.affiliation: Institute of Health & Environment, Province of Gyeongsangbuk-do, 22 Gosugol-gil, Geumho-eup, Yeongcheon, Gyeongbuk 770-805, Republic of Korea.
authors.forename: Ha-Ju
authors.initials: HJ
authors.lastname: Beak
authors.affiliation: Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, Republic of Korea. Electronic address: chookh@knu.ac.kr.
authors.forename: Kwang-Ho
authors.initials: KH
authors.lastname: Choo
mesh_terms: D057219:Biofouling; D019149:Bioreactors; D002384:Catalysis / Q000528:radiation effects; D004146:Dioxanes / Q000737:chemistry*; D007220:Industrial Waste; D008567:Membranes, Artificial; D008962:Models, Theoretical; D010782:Photolysis; D013472:Sunlight; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D018508:Water Purification / Q000379:methods*
chemical_list: D004146:Dioxanes; D007220:Industrial Waste; D008567:Membranes, Artificial; C009495:titanium dioxide; D014025:Titanium; C025223:1,4-dioxane
keywords: 1,4-Dioxane; Fouling; Membrane reactor; Photocatalysis; Textile wastewater