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Ridurre i gas serra dal ciclo dei rifiuti

Una corretta gestione dei rifiuti, finalizzata a ridurre drasticamente il ricorso alla discarica a favore del riciclo dei materiali e del recupero energetico ad alta efficienza dal rifiuto residuo può contribuire in maniera significativa alla riduzione delle emissioni di gas serra dal settore. Un recente studio dell’European Environmental Agency quantifica in 78 milioni di tonnellate di CO2 equivalente il risparmio annuale che si può conseguire in Europa nell’ipotesi di abbandonare totalmente lo smaltimento in discarica nell’anno 2020.

Balle di PET separato meccanicamente dal flusso di plastica raccolto per via differenziata pronto per il riciclo

In attesa che una foresta artificiale o una mongolfiera gigante ci vengano in soccorso nel mitigare gli effetti dei cambiamenti climatici, conviene tornare con i piedi per terra e focalizzarci ancora una volta su quella che è la via maestra per affrontare seriamente il problema: la riduzione delle emissioni di gas serra.

In questo senso, una corretta ed avanzata gestione dei rifiuti può fornire un contributo tutt’altro che trascurabile, come ci illustra un recente rapporto pubblicato dall’European Environmental Agency (EEA) di Copenhagen, Agenzia il cui compito consiste nel fornire informazioni valide e indipendenti sull’ambiente. Il rapporto “Waste opportunities – Past and future climate benefits from better municipal waste management in Europe” affronta la tematica con l’approccio del “ciclo di vita”, ben noto a coloro che si occupano specificamente della gestione dei rifiuti, in contrasto con l’approccio settoriale dell’IPCC. Per quest’ultimo la gestione dei rifiuti rappresenta unicamente una sorgente di emissioni di gas serra in atmosfera, con tipologie e quantitativi differenti a seconda della tecnologia di trattamento considerata (discarica, digestione anaerobica, incenerimento senza recupero energetico). Ad esempio le emissioni dalle discariche sono costituite essenzialmente dalla quota parte di metano contenuto all’interno della frazione di biogas non captato, quelle dall’incenerimento dalla CO2 di origine fossile emessa al camino, e così via. Continue Reading »

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