The treatment of tannery wastewaters is a complex task due to the complexity of the waste: a mixture of several pollutants, both anionic and cationic as well as organic macromolecules which are very hard to treat for disposal all together. Geopolymers are a class of inorganic binders obtained by alkali activation of aluminosilicate powders at room temperature. Such activation process leads to a cement like matrix that drastically decreases mobility of several components via entrapment. This process taking place in the matrix can be hypothesized to be the in-situ formation of zeolite structures. In this work we use a metakaolin based geopolymer to tackle the problem directly in an actual industrial environment. To obtain a geopolymer, the metakaolin was mixed with 10 wt% of wastewater added with sodium hydroxide and sodium silicate as activating solutions. This process allowed a rapid consolidation at room temperature, the average compressive strength was between 14 and 43 MPa. Leaching tests performed at different aging times confirm a high immobilization efficiency close to 100%. In particular, only the 0.008 and 2.31% of Chromium and Chlorides respectively are released in the leaching test after 7 months of aging.

Efficient chemical stabilization of tannery wastewater pollutants in a single step process: Geopolymerization / Boldrini, G.; Sgarlata, C.; Lancellotti, I.; Barbieri, L.; Giorgetti, M.; Ciabocco, M.; Zamponi, S.; Berrettoni, M.; Leonelli, C.. - In: SUSTAINABLE ENVIRONMENT RESEARCH. - ISSN 2468-2039. - 31:1(2021), pp. 1-11. [10.1186/s42834-021-00106-7]

Efficient chemical stabilization of tannery wastewater pollutants in a single step process: Geopolymerization

Sgarlata C.
Investigation
;
Lancellotti I.
Conceptualization
;
Barbieri L.
Writing – Original Draft Preparation
;
Leonelli C.
Supervision
2021

Abstract

The treatment of tannery wastewaters is a complex task due to the complexity of the waste: a mixture of several pollutants, both anionic and cationic as well as organic macromolecules which are very hard to treat for disposal all together. Geopolymers are a class of inorganic binders obtained by alkali activation of aluminosilicate powders at room temperature. Such activation process leads to a cement like matrix that drastically decreases mobility of several components via entrapment. This process taking place in the matrix can be hypothesized to be the in-situ formation of zeolite structures. In this work we use a metakaolin based geopolymer to tackle the problem directly in an actual industrial environment. To obtain a geopolymer, the metakaolin was mixed with 10 wt% of wastewater added with sodium hydroxide and sodium silicate as activating solutions. This process allowed a rapid consolidation at room temperature, the average compressive strength was between 14 and 43 MPa. Leaching tests performed at different aging times confirm a high immobilization efficiency close to 100%. In particular, only the 0.008 and 2.31% of Chromium and Chlorides respectively are released in the leaching test after 7 months of aging.
2021
31
1
1
11
Efficient chemical stabilization of tannery wastewater pollutants in a single step process: Geopolymerization / Boldrini, G.; Sgarlata, C.; Lancellotti, I.; Barbieri, L.; Giorgetti, M.; Ciabocco, M.; Zamponi, S.; Berrettoni, M.; Leonelli, C.. - In: SUSTAINABLE ENVIRONMENT RESEARCH. - ISSN 2468-2039. - 31:1(2021), pp. 1-11. [10.1186/s42834-021-00106-7]
Boldrini, G.; Sgarlata, C.; Lancellotti, I.; Barbieri, L.; Giorgetti, M.; Ciabocco, M.; Zamponi, S.; Berrettoni, M.; Leonelli, C.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1255059
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