Synthesis of nano-zeolite from coal fly ash and its potential for nutrient sequestration from anaerobically digested swine wastewater

Bioresource Technology
Xiaoyan ChenZhijian Zhang

Abstract

The treatment of anaerobically digested swine wastewater (ADSW) is problematic due to its high nutrient concentration. This study investigated the simultaneous sequestration of ammonium (N) and phosphate (P) from ADSW using nano-zeolites synthesized from fly ash (ZFA). The nanometer-scale crystalline structures plentiful of zeolite-NaP1 coating on ZFA particle increased the levels of specific surface area and cation exchange capacity at times of 40 and 104, compared to raw fly ash. Kinetic N and P sorption experiments with ZFA were well described by both the Langmuir and Freundlich models, suggesting the co-existence of homogeneous and heterogeneous sorption mechanisms. N and P removal efficiencies ranged from 41% to 95% and 75% to 98%, respectively, across a range of ZFA doses (from 0.25 to 8g/100ml). Collectively, application of the laboratory-synthesized ZFA can alleviate the nutrient loads in ADSW and therefore modify the ratio of N:P in wastewater beneficial for subsequent biological treatment.

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Citations

Sep 13, 2013·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·ZhiJian ZhangQiang He
Oct 27, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·X D JiF Zhang
Dec 16, 2019·Environmental Science and Pollution Research International·Dimitris MitrogiannisIoannis Baziotis
May 23, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Golnaz KhorshaAllen P Davis

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