Kinetics and equilibrium of adsorption of dissolved organic matter fractions
from secondary effluent by fly ash |
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Authors: | Liangliang Wei Kun Wang Qingliang Zhao Chunmei Xie Wei Qiu and Ting Jia |
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Institution: | 1. School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: llwei1985 @126.com 2. School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: llwei1985 @126.com ;State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract: | Fly ash was used as a low-cost adsorbent for removing dissolved organic matter (DOM) in secondary effluent. Batch experiments were
conducted under various adsorbent dosages, pH, contact time, temperatures and DOM fractional characteristics. Under the optimum
conditions of fly ash dosage of 15 g/L, temperature of 303 K and contact time of 180 min, a removal of 22.5% of the dissolved
organic carbon (DOC), 23.7% of UV-254, 25.9% of the trihalomethanes precursors in secondary effluent was obtained. The adsorption
of DOM fractions onto fly ash all followed the pseudo second-order kinetic model, and the hydrophilic fraction adsorption by fly
ash also fitted the intraparticle diffusion model quite well. Freundlich and Langmuir models were applicable to the fly ash adsorption
and their constants were evaluated. The maximum adsorption capacities of the adsorptions revealed that fly ash was more effective
in adsorbing hydrophilic fraction than the acidic fractions. Structure changes of the DOM fractions after fly ash adsorption were also
characterized via spectrum analyzing. Those mechanisms presented critical step toward improved efficiencies of fly ash adsorption via
further surface-modification. |
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Keywords: | fly ash adsorption dissolved organic matter fractionation kinetics |
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