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Sulfide Generation and Clogging during Infiltration of Denitrified Domestic Wastewater through Two Artificially Created Soils.

Ghorbel, Leila; Coudert, Lucie; Gilbert, Yan; Mercier, Guy; Blais, Jean-François (2017). Sulfide Generation and Clogging during Infiltration of Denitrified Domestic Wastewater through Two Artificially Created Soils. Journal of Environmental Engineering , vol. 143 , nº 12. 04017079. DOI: 10.1061/(ASCE)EE.1943-7870.0001277.

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Résumé

This study focused on a pilot-scale infiltration of denitrified wastewater through artificially created soils. The hydraulic performance and sulfide production were evaluated to ensure the system’s longevity over the period needed for autotrophic denitrification. Experiments were carried out over a year in two reactors of 200-L capacity. Sandy and sandy loam soils were tested to represent highly permeable (Ks=0.028  cm/s) and permeable (Ks=0.0013  cm/s) soils, respectively. The infiltration of denitrified wastewater at a continuous hydraulic rate (130 and 70  L/m²/day) through these soils did not lead to the production of large amounts of gaseous hydrogen sulfide [[H₂S] < 2.1 parts per million (ppm)] or aqueous sulfides ([HS−+H₂S] < 0.7  mg/L) sulfides in both feeding influent and effluents of the 200-L reactors. Considering the hydraulic performance, no loss in the infiltration capacity was recorded for the sandy soil, whereas a clogging phenomenon was observed after 37 days for the sandy loam soil. Two factors were responsible for this clogging phenomenon. A fine brown layer, known as a biomat, was formed on the infiltrative surface (IS) of the soil, which led to the formation of iron ochre at the bottom of the reactor. As an ascertainment attributed to the clogging phenomenon faced, sandy soil appeared to be the best choice as it did not contain organic matter, which could lead to the biomat formation and thus to a clogging phenomenon.

Type de document: Article
Mots-clés libres: autotrophic denitrification; clogging phenomenon; domestic wastewater; sulfide generation; reactors
Centre: Centre Eau Terre Environnement
Date de dépôt: 28 nov. 2017 14:47
Dernière modification: 28 nov. 2017 14:47
URI: http://espace.inrs.ca/id/eprint/6371

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