Microbial mediated method for soil and water treatment

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/34 (2006.01) B09C 1/10 (2006.01) C02F 3/12 (2006.01) C02F 3/28 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2139863

Methods for treating aqueous/sedimentary systems, sediments and soils are disclosed for prevention of activation and for control or clean-up. The method involves intentionally adding to an aqueous system containing unwanted sulfur and phosphorus in the water and hydrocarbons in the sediment, iron species selected from the group consisting of elemental iron, iron carbonates and iron oxides. Iron-phosphorus compounds and iron-sulfur compounds are precipitated and thereby removed from the system. Hydrocarbons are converted into water, carbon dioxide and small amounts of methane. In a practice of this invention, propagation of aquatic vegetation dependent upon phosphorus species and sulfur species is inhibited by the removal of these species therefrom. Heavy metals are inactivated.

Cette invention concerne des procédés de traitement de systèmes eau/sédiments, de sédiments et de sols destinés à prévenir l'activation et à réguler ou à nettoyer. Selon ce procédé on ajoute volontairement dans un système aqueux dont l'eau contient du soufre et du phosphore indésirables et dont les sédiments renferment des hydrocarbures, des espèces de fer sélectionnées dans le groupe comprenant du fer naturel, des carbonates de fer et des oxydes de fer. Les composés fer-phosphore et les composés fer-soufre forment un précipité et ils sont éliminés de la sorte du système. Les hydrocarbures se transforment en eau, en dioxyde de carbone et en faibles quantités de méthane. En pratique, la propagation de la végétation aquatique qui dépend des espèces de phosphore et des espèces de soufre est inhibée par l'élimination de ces mêmes espèces du milieu. Les métaux lourds sont inactivés.

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