Leachate treatment system

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 1/14 (2006.01) B09B 1/00 (2006.01)

Patent

CA 2114555

In the representative leachate treatment system disclosed in the specification, leachate (17) is supplied to a submerged combustion gas evaporator (10) having a downwardly-directed central burner supplying combustion gases through a downcomer to a combustion gas distributor in an evaporation zone. A conical baffle beneath the gas distributor separates the evaporation zone from a quiescent settling zone in a conical bottom of the distributor from which leachate concentrate and sludge are removed. The leachate (173 supplied to the evaporator (10) is preheated (16) by exhaust gases (30) from the evaporator (10) and combustion air (21) supplied to the burner is preheated (25) by leachate concentrate and sludge (18) removed from the evaporator (10). Landfill gases (I l) may be used to fuel the burner and the sludge (18) may be further concentrated (20) and liquid from the concentrator (20) returned to the evaporator (21).

Dans le système de traitement du lixiviat, divulgué dans la description, le lixiviat (17) est amené à un évaporateur (10) pour gaz de combustion submergée, possédant un brûleur central orienté vers le bas, qui envoie des gaz de combustion via un déversoir vers un distributeur de gaz dans une zone d'évaporation. Un déflecteur conique en dessous du distributeur de gaz sépare la zone d'évaporation d'une zone de dépôt au repos dans le fond conique du distributeur d'où sont retirés le concentré de lixiviat et la boue. Le lixiviat (17) amené à l'évaporateur (10) est préchauffé (16) par les gaz d'échappement (30) provenant de l'évaporateur (10); l'air de combustion (21) alimentant le brûleur est préchauffé (25) par le concentré de lixiviat et la boue (18) retirés de l'évaporateurr (10). Les gaz de décharge (1l) peuvent servir à alimenter le brûleur; la boue (18) peut être concentrée davantage (20); enfin, le liquide provenant du concentrateur (20) peut être renvoyée à l'évaporateur (21).

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