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

作　　者：Emilia Otal Luls F. Vilches Yolanda Luna Rodrigo Poblete Juan M. Garcia-Maya Constantino Ferneindez-Pereira 

机构地区：[1]Department of Chemical and Environmental Engineering, School of Engineering, University of Seville, Camino delos Descubrimientos s/n, 41092 Seville, Spain

出　　处：《Chinese Journal of Chemical Engineering》2013年第9期1062-1068,共7页中国化学工程学报（英文版）

基　　金：Supported by the Spanish Ministry of Science and Innovation,under the project FOXMORE(CTM2006-05114)

摘　　要：Municipal wastewater treatment plants typically exhibit two classic problems： high ammonium concen- tration 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-＇. Utiliza- tion 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 comoact ability. This is confirmed by the sludge volume index （SVI）, which was reduced from 163 ml.g-1 to 70 ml.g-r, the V60 value, which was reduced from 894 ml.L-1 to 427 ml.L-1, and the zeta poten- tial （0, 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.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 1to 70 ml·g 1,the V60value,which was reduced from 894 ml·L 1to 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 

分 类 号：X703[环境科学与工程—环境工程] TQ424.25[化学工程]