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Efeito da digestão anaeróbia e da estabilização com cal na mineralização do carbono e do azoto de lamas de ETAR

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Summary:This work aims to evaluate the N and C mineralization in a Haplic Arenosol amended with 3 different sewage sludge: mixture of primary and secondary sewage sludge (MSS), anaerobically digested sewage sludge (DSS) and anaerobically digested sewage sludge treated with quicklime (LimeDSS). Two aerobic incubations, one to follow N mineralization and the other one to assess CO2 emissions, were performed during 140 days. MSS promoted soil N immobilization during the first days of incubation and higher CO2 emissions (46% of the applied C was lost), consequence of a high content of non-stabilized organic matter. In DSS there was nitrogen net mineralization but only 17% of the applied carbon was mineralized, showing that anaerobic digestion stabilized the sludge organic matter. Sewage sludge treatment with quicklime reduced its NH4+ content, but enhanced carbon (40%) and nitrogen (39.2%) mineralization after soil application. Anaerobic digested sewage sludge (DSS) seems to be the most interesting treatment, since it ensured a high level of available N to plants and a great contribution to C sequestra-tion in soil.
Main Authors:Bancessi, Aducabe
Other Authors:Ribeiro, Henrique Manuel; Fangueiro, David; Duarte, Elisabeth; Cabral, Fernanda; Vasconcelos, Ernesto
Subject:nitrogen carbon stabilization sewage sludge mineralization
Year:2011
Country:Portugal
Document type:article
Access type:open access
Associated institution:Universidade de Lisboa
Language:Portuguese
Origin:Repositório da Universidade de Lisboa

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