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Impact of Sequential Treatments with Natural and Na-Exchanged Chabazite Zeolite-Rich Tuff on Pig-Slurry Chemical Composition

1
Department of Physics and Earth Science, University of Ferrara, Via Saragat 1 44122 Ferrara, Italy
2
Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41121 Modena, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 310; https://doi.org/10.3390/w12020310
Received: 20 December 2019 / Revised: 13 January 2020 / Accepted: 19 January 2020 / Published: 21 January 2020
(This article belongs to the Section Wastewater Treatment and Reuse)
Notwithstanding the widespread use of natural and pre-exchanged zeolites for zootechnical effluent treatment, little attention has been dedicated to the variation in the chemical composition of the treated slurries, besides the effects on their NH4+ content. This paper aimed at elucidating the compositional variations in terms of major and trace elements of a raw pig-slurry (PS) after three sequential treatment cycles (TC) with three different grain sizes of natural and Na-exchanged zeolite-rich volcanic tuffs (natural ZTs and NaZTs). A series of laboratory batch experiments revealed that all ZTs had profoundly influenced the final PS chemical composition. As expected, the NaZTs were more efficient in terms of NH4+ removal than the natural ZTs, reaching almost 60% reduction of the initial content after three TCs. A parallel effect of this efficient removal was the remarkable increase in Na+. The Na-forms of ZTs led also to stronger competition with K+ ions, resulting in adsorption of this macronutrient and hence in a reduction of the fertilization value of the PS. In terms of heavy metals and other trace elements, all the treatments with ZTs had significantly increased the Li, Ba, Rb, Sr, Ga, and U content in the PS. View Full-Text
Keywords: zeolites; enriched zeolites; zootechnical effluents; agriculture; chabazite; natural zeolites; trace elements; animal slurries; liquid manure; zeolitite zeolites; enriched zeolites; zootechnical effluents; agriculture; chabazite; natural zeolites; trace elements; animal slurries; liquid manure; zeolitite
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Ferretti, G.; Galamini, G.; Medoro, V.; Coltorti, M.; Di Giuseppe, D.; Faccini, B. Impact of Sequential Treatments with Natural and Na-Exchanged Chabazite Zeolite-Rich Tuff on Pig-Slurry Chemical Composition. Water 2020, 12, 310.

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