Ammonium Ion Adsorption and Settleability Improvement Achieved in a Synthetic Zeolite-Amended Activated Sludge

doi:10.1016/S1004-9541(13)60566-2

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (9): 1062-1068.DOI: 10.1016/S1004-9541(13)60566-2

• 能源、资源与环境技术 • 上一篇

Ammonium Ion Adsorption and Settleability Improvement Achieved in a Synthetic Zeolite-Amended Activated Sludge

Emilia Otal, Luís F. Vilches, Yolanda Luna, Rodrigo Poblete, Juan M. García-Maya, Constantino Fernández-Pereira

Department of Chemical and Environmental Engineering, School of Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain

收稿日期:2012-09-07 修回日期:2013-01-17 出版日期:2013-09-28 发布日期:2013-10-01
通讯作者: Emilia Otal
基金资助:
Supported by the Spanish Ministry of Science and Innovation, under the project FOXMORE (CTM2006-05114)

Ammonium Ion Adsorption and Settleability Improvement Achieved in a Synthetic Zeolite-Amended Activated Sludge

Emilia Otal, Luís F. Vilches, Yolanda Luna, Rodrigo Poblete, Juan M. García-Maya, Constantino Fernández-Pereira

Department of Chemical and Environmental Engineering, School of Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain

Received:2012-09-07 Revised:2013-01-17 Online:2013-09-28 Published:2013-10-01
Contact: Emilia Otal
Supported by:
Supported by the Spanish Ministry of Science and Innovation, under the project FOXMORE (CTM2006-05114)

摘要/Abstract

摘要： Municipal wastewater treatment plants typically exhibit two classic problems: high ammonium concentration in water after conventional biological treatment and, in some cases, poor activated sludge sediment ability. Potential solutions to these problems were investigated by adding a synthetic zeolite obtained from coal fly ash to different steps of activated sludge treatment. The experimental results for ammonium removal fit well with the theoretical adsorption isotherms of the Freundlich model with a maximum adsorption capacity of 13.72 mg·g^-1. Utilization of this kind of zeolite to improve activated sludge sediment ability is studied for the first time in this work. It is found that the addition of the zeolite (1 g·L^-1) to an activated sludge with settling problems significantly enhances its sediment ability and compact ability. This is confirmed by the sludge volume index (SVI), which was reduced from 163 ml·g^-1 to 70 ml·g^-1, the V₆₀ value, which was reduced from 894 ml·L^-1 to 427 ml·L^-1, and the zeta potential (ζ), which was reduced from -19.81 mV to -14.29 mV. The results indicate that the addition of this synthetic zeolite to activated sludge, as an additional waste management practice, has a positive impact on both ammonium removal and sludge settleability.

关键词: low-cost sorbent, nitrogen, settleability, zeolite adsorption, zeta potential

Abstract: Municipal wastewater treatment plants typically exhibit two classic problems: high ammonium concentration in water after conventional biological treatment and, in some cases, poor activated sludge sediment ability. Potential solutions to these problems were investigated by adding a synthetic zeolite obtained from coal fly ash to different steps of activated sludge treatment. The experimental results for ammonium removal fit well with the theoretical adsorption isotherms of the Freundlich model with a maximum adsorption capacity of 13.72 mg·g^-1. Utilization of this kind of zeolite to improve activated sludge sediment ability is studied for the first time in this work. It is found that the addition of the zeolite (1 g·L^-1) to an activated sludge with settling problems significantly enhances its sediment ability and compact ability. This is confirmed by the sludge volume index (SVI), which was reduced from 163 ml·g^-1 to 70 ml·g^-1, the V₆₀ value, which was reduced from 894 ml·L^-1 to 427 ml·L^-1, and the zeta potential (ζ), which was reduced from -19.81 mV to -14.29 mV. The results indicate that the addition of this synthetic zeolite to activated sludge, as an additional waste management practice, has a positive impact on both ammonium removal and sludge settleability.

Key words: low-cost sorbent, nitrogen, settleability, zeolite adsorption, zeta potential

Emilia Otal, Luís F. Vilches, Yolanda Luna, Rodrigo Poblete, Juan M. García-Maya, Constantino Fernández-Pereira. Ammonium Ion Adsorption and Settleability Improvement Achieved in a Synthetic Zeolite-Amended Activated Sludge[J]. Chinese Journal of Chemical Engineering, 2013, 21(9): 1062-1068.

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Ammonium Ion Adsorption and Settleability Improvement Achieved in a Synthetic Zeolite-Amended Activated Sludge

Ammonium Ion Adsorption and Settleability Improvement Achieved in a Synthetic Zeolite-Amended Activated Sludge

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