کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5747423 1618798 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of the dosage ratio and the viscosity of PAC/PDMDAAC on coagulation performance and membrane fouling in a hybrid coagulation-ultrafiltration process
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Effect of the dosage ratio and the viscosity of PAC/PDMDAAC on coagulation performance and membrane fouling in a hybrid coagulation-ultrafiltration process
چکیده انگلیسی


- Coagulant aid PDMDAAC with different viscosities could improve the HA removal.
- Co-coagulant PAC/PDMDAAC showed enhanced floc strength and recovery ability.
- Floc size and recovery factor had an important effect on ultrafiltration.
- The slightest membrane fouling was achieved by PAC/PDMDAAC (ηPDMDAAC = 1.86 dL/g).

This study systematically determined the optimal dosage ratio and the viscosity (η) of co-coagulants, polyaluminum chloride (PAC) and poly dimethyldiallylammonium chloride (PDMDAAC), on coagulation performance and membrane fouling in a hybrid coagulation-ultrafiltration (C-UF) process for natural organic matter (NOM) removal. Floc characteristics-including floc size, fractal dimension, strength and re-growth ability-were studied with respect to coagulant-dosing operations. Membrane fouling was evaluated in association with assessment of NOM removal performance by the hybrid process. The best coagulation performance was achieved when PAC and PDMDAAC were dosed with 1.0 mg/L and 0.1 mg/L, respectively. The addition of PDMDAAC could enhance the NOM removal efficiency, especially at low PAC dosages. Co-coagulants PAC/PDMDAAC (ηPDMDAAC = 2.18 dL/g) resulted in formation of the largest flocs with the smallest Df under all shear conditions, while the flocs formed by PAC/PDMDAAC (ηPDMDAAC = 1.86 dL/g) had higher recovery abilities. The results from ultrafiltration experiments indicated that coagulation using PAC/PDMDAAC with a viscosity range from 0.99 dL/g to 1.86 dL/g can significantly reduce membrane fouling, leading to increasing water fluxes from 0.1170 to 0.4906 in the ultrafiltration process.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 173, April 2017, Pages 288-298
نویسندگان
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