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Efficiency of Coal Fly Ash Derived Zeolite in Removing Ammoniacal Nitrogen from Freshwater Pearl Farming Wastewater

SSRN, ISSN: 1556-5068
2024
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Article Description

Given that freshwater pearl farming has emerged as a pillar industry for numerous local governments in China, overfeeding of pearl oysters has resulted in wastewater with high ammoniacal nitrogen (NH3-N) content, posing a serious threat to the local environment. This study utilized coal fly ash (CFA), an industrial waste, to prepare zeolite, which demonstrated high NH3-N removal efficiency from freshwater pearl farming wastewater. The CFA-derived zeolite was prepared using pickling pretreatment and hydrothermal synthesis methods. The resultant A-type zeolite featured cubic and spherical crystal microstructures, with a specific surface area of 17.5 m2/g, an average pore size of approximately 10.7 nm, and a pore volume of about 0.03 cm3/g. Additionally, its decomposition temperature exceeds 400 °C. The adsorption process of NH3-N was thoroughly investigated. Adsorption kinetics and isotherm analyses indicated that the pseudo-first-order and Dubinin-Radushkevich models more accurately represent the kinetics and adsorption behavior of CFA-derived zeolite in the NH3-N adsorption process. When applied to raw freshwater pearl farming wastewater, the zeolite achieved a removal efficiency of 74% at a dosage of 70 g/L. This strategy not only addresses the pollution problem associated with coal fly ash but also benefits freshwater pearl farming, achieving a "win-win" outcome.

Bibliographic Details

Honghao Chen; Jutao Wang; Bo Xia; Xiaocheng Pan

Elsevier BV

Multidisciplinary; Freshwater Pearl Farming Wastewater; Coal Fly Ash; Zeolite; Ammoniacal Nitrogen adsorption

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