Method for producing non-putrescible sludge and energy and...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 11/04 (2006.01) C02F 11/08 (2006.01) C02F 11/12 (2006.01) C02F 11/18 (2006.01)

Patent

CA 2754100

The invention relates to a method for producing non-putrescible sludge and energy, wherein said method includes the following steps: (i) producing digested sludge by means of primary sludge digestion; (ii) producing a first aqueous effluent and digested sludge, which are at least partially dehydrated by a first liquid- solid separation of the digested sludge produced in step (i); (iii) producing digested sludge at least partially dehydrated and hydrolysed by thermal hydrolysis of the at least partially dehydrated digested sludge produced in step (ii); (iv) digesting the at least partially dehydrated and hydrolysed digested sludge produced in step (iii); wherein said method further includes a step of recovering the biogases formed during said digestion and said primary digestion, and a step of producing energy from said biogas, including a first sub-step of producing the energy required for implementing said thermal hydrolysis and a sub-step of producing excess energy, the entirety of the biogas being used for producing electricity.

L'invention concerne un procédé d'obtention de boues imputrescibles et d'énergie, ledit procédé comprenant les étapes suivantes: (i) obtention de boues digérées par digestion primaire de boues; (ii) obtention d'un premier effluent aqueux et de boues digérées au moins partiellement déshydratées par une première séparation liquide-solide des boues digérées obtenues à l'étape (i); (iii) obtention de boues digérées au moins partiellement déshydratées et hydrolysées par hydrolyse thermique des boues digérées au moins partiellement déshydratées obtenues à l'étape (ii); (iv) digestion des boues digérées au moins partiellement déshydratées et hydrolysées obtenues à l'étape (iii); ledit procédé comprenant en outre: une étape de récupération des biogaz formés au cours desdites digestion et digestion primaire et une étape de production d'énergie à partir dudit biogaz comprenant une sous-étape de production d'énergie nécessaire à la mise en uvre de ladite hydrolyse thermique et une sous-étape de production d'énergie excédentaire, la totalité dudit biogaz étant utilisée pour produire de l'électricité.

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