Author: Leng, Ling
Title: Selective sequestration of sodium dodecyl sulfate with functionalized zeolite for post-treatment of anaerobically-treated greywater
Degree: M.Sc.
Year: 2013
Subject: Sewage -- Purification -- Anaerobic treatment.
Water reuse.
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Construction and Environment
Pages: xi, 57 leaves : ill. (some col.) ; 30 cm.
Language: English
Abstract: Water shortage, energy security, and climate change are three of the most prominent global challenges that need to be addressed. One of the solutions to these challenges is through the use of decentralized anaerobic treatment with greywater for water reuse, energy recovery, and reduction of carbon footprint. Despite the decentralized anaerobic treatment with greywater has shown its promising potential to resolve these challenges, the bottleneck of this process is poor degradability of anionic surfactants significantly containing in greywater. The purpose of this study was to investigate the removal/adsorption performance of a common anionic surfactant, sodium dodecyl sulfate (SDS), existing in greywater with modified zeolite. To this end, cetyl trimethylammonium bromide (CTAB) was used to functionalize the surface characteristic of Na-zeolite. The modification process and effect was studied. SDS adsorption performance was evaluated at different conditions, e.g. zeolite loading, pH, contact time, and coexisting chemicals. Adsorption mechanisms were analyzed by adsorption kinetics models and adsorption isotherm models. This modified zeolite capacity reached 1.68-2.71 mg g⁻¹, while the Na-zeolite one only reached 0.71 mg g⁻¹. Optimum CTAB concentration was around 200% ECEC of Na-zeolite. The pH effect on its adsorption capacity was negligible. The adsorption followed the pseudo-second-order kinetics model with equilibrium reaching around 90 minutes at different temperatures. Activation energy was obtained 76.90 KJ mol⁻¹ using Arrhenius plot. Equilibrium data fitted well with Langmuir isotherm model. Adsorption performance was better at lower temperature implying that SDS adsorption onto CTAB modified Na-zeolite is exothermic reaction. More than 85% of the initial SDS adsorption capacity was retained, regenerated by 1M sodium chloride. The presence of ammonia slightly and gradually suppressed the adsorption of SDS onto CTAB modified Na-zeolite. However, inorganic anions, sulfate and phosphate, did not affect the adsorption of SDS significantly. SDS expected adsorption performance was obtained in synthetic greywater as well. We envision that this CTAB modified Na-zeolite could serve as a cost-efficient adsorbent on anionic surfactants removal as a post-treatment of anaerobically-treated greywater for reuse.

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