Chiang Mai Journal of Science

Synthesis and Use of Zeolite Na-A from Waste Sludge of Water Treatment Plant for Ammonium Removal

Paper Type	Contributed Paper
Title	Synthesis and Use of Zeolite Na-A from Waste Sludge of Water Treatment Plant for Ammonium Removal
Author	Jeatana Wongwichien [a], Suwimol Asavapisit [a] and Kwannate Sombatsompop* [b]
Email	kwn@kmutnb.ac.th
Abstract:  Zeolite Na-A from waste sludge of water treatment plants was synthesized via a hydrothermal process for the purpose of ammonium removal. Sludge samples, with and without burning at 700 ºC for 3 hours, were used and reacted with 3M NaOH solution. The effects of contact time, pH and initial ammonium concentration on ammonium uptake and adsorption isotherms were investigated. An optimal condition for ammonium ion adsorption was determined and then compared with Langmuir and Freundlich isotherms.  Analysis of the synthesized zeolite Na-A by SEM revealed that the zeolite Na-A was cubic in shape for all experimental conditions. Zeolite was clearly observed from samples with sludge burning at the reaction time of 9 h. The cation exchange capacity of zeolite Na-A synthesized was found to be 1.07 meq/g. The adsorption capacity showed that the optimum pH and contact time were  8 and 5 min, respectively. The Langmuir model provided a better description of ammonium adsorption than the Freundlich model, and the maximum adsorption capacity by the Langmuir Isotherm was 8.88 mg/g. It was concluded that the zeolite Na-A synthesized from waste sludge has a potential to remove ammonium from wastewater.
Start & End Page	1262 - 1273
Received Date	2013-03-07
Revised Date
Accepted Date	2013-09-08
Full Text	Download
Keyword	Zeolite, Sludge, Hydrothermal, Adsorption, Ammonium
Volume	Vol.41 No.5/2 (OCTOBER 2014)
DOI
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