| Summary: | 碩士 === 嘉南藥理科技大學 === 環境工程與科學系 === 101 === Abstract
High-tech industries have been rapidly developing for the last two decades in Taiwan, which also results in high concentrations of various nitrogenous compounds in the wastewater, such as eutrophication.
Polyvinylidene fluoride (PVDF) membranes with asymmetric structures and good hydrophobicity have been prepared by a phase-inversion method and applied for removal of ammonia from water by membrane contactor. Aqueous solution containing sulfuric acid and Hydrochloric acid was used as stripping solution to accelerate the removal of ammonia.
The effects of concentration of PVDF, PVA and PEG on the performance of the hollow fiber membranes were investigated. Property of prepared membranes such as structure morphology, pore size, Young’s modulus and NH4+ removal were characterized by scanning electron microscopy (SEM) , tensile tester and IC, respectively.
The simulated wastewater, aqueous ammonium chloride solution with a pH value of 11, was pumped into single tube continuous membrane contactor which dips in the stripping solution, 0.8 M aqueous sulfuric acid solution. The experimental results show, when add PVA 15wt% in 20wt% PVDF dope solution, which increase pore size and improve the flux. NH4+ removal was increase form 56%(pure PVDF membrane) to 92%.
The study also treats high concentration of real industries ammonia wastewater. It was found that investigation of 20wt% PVDF hollow fiber membrane contactor the NH4+ removal of 14,000 mg/L wastewater was 100% in 750 min batch experiment.
PVDF hollow fiber membrane presented good durability. Furthermore, per liter of sulfuric acid (0.8M), 46.88 g NH4+ was extracted by PVDF hollow fiber membrane contactor with 22 runs test in 220 hours. Therefore, membrane contact system had great potential for future applications in wastewater treatment with high strength of ammonium.
Keywords: membrane contactor; ammonium removal;polyvinylidene fluoride (PVDF); PVA; PEG
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