Caracterização de lodo gerado em estações de tratamento de água: perspectivas de aplicação agrícola
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Data
2008-01-18
Autores
Botero, Wander Gustavo [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho caracterizou lodos gerados em estações de tratamento de água de Jaboticabal-SP que utiliza cloreto férrico como floculante (FeCl3) e de Taquaritinga-SP e Manaus-AM, que utilizam sulfato de alumínio (Al2(SO4)3) como floculante. Foram feitas análises para avaliação da fertilidade, análise elementar e determinação de micro e macro-nutrientes e metais potencialmente tóxicos totais e biodisponíveis. Os resultados mostraram que os lodos apresentam potencial agrícola e elevados teores de matéria orgânica, sendo maiores para o lodo de Manaus-AM, que apresentou também maior grau de decomposição da matéria orgânica. Os teores de macro e micro-nutrientes e metais potencialmente tóxicos e biodisponiveis estão diretamente relacionados com o tipo de floculante utilizado no tratamento convencional da água e nas características da água bruta captada. As substâncias húmicas extraídas dos lodos de estações de tratamento de água (ETA) foram caracterizadas por análise elementar e análise térmica, apresentando para amostra de Manaus-AM maior grau de humificação. A estabilidade térmica se apresentou dependente do tipo de tratamento utilizado no lodo. Os estudos de complexação mostraram cinética de 10 minutos para íons cobre. Pela capacidade de complexação pode-se estabelecer a seguinte ordem de afinidade das SH por espécies metálicas:. Lodo de estação de tratamento de água de Jaboticabal-SP: Fe<Al<Ca<Cu<Mn<Mg;. Lodo de estação de tratamento de água de Taquaritinga-SP: Mn<Al<Ca<Cu<Fe<Mg; . Lodo de estação de tratamento de água de Manaus-AM: Mn<Al<Cu<Ca<Fe<Mg. As labilidade relativas tiveram o equilíbrio de troca atingido após 1 hora de contato e foram menores para lodos de Manaus-AM e o magnésio apresentou a menor labilidade relativa frente ao quelante dietilenotriaminopentaacético (DTPA)...
This work characterized sludge discharges from water treatment plants at the town Jaboticabal, São Paulo, Brazil using ferric chloride (FeCl3) as clotting and at the town Taquaritinga, São Paulo, Brazil and Manaus, Amazonas, Brazil, using aluminum sulfate (Al2 (SO4)3) as clotting. Tests were made for fertility, elemental analysis and determination of micro and macro-nutrients and potentially toxic metals. The results showed that the sludge present agricultural potential and high levels of organic matter, and higher for the sludge of Manaus-AM, which has also presented greater degree of decomposition of organic matter. The levels of macro and micronutrients and potentially toxic metals and bioavailable are directly related to the type of clotting used in the conventional treatment of water and the characteristics of water. Humic substances from the sludges generated in water treatment plants were characterized by elemental analysis and thermal analysis, presenting to sample Manaus-AM greater degree of humification. The thermal stability came dependent on the type of treatment used in the sludge. Studies of complexation showed kinetics of 10 minutes for copper ions. For the ability to complexation one can establish the following order of affinity of humic substances by metallic ions: . Sludge generated in water treatment plants of Jaboticabal-SP: Fe <Al <Ca <Cu <Mn <Mg;This work characterized sludge discharges from water treatment plants at the town Jaboticabal, São Paulo, Brazil using ferric chloride (FeCl3) as clotting and at the town Taquaritinga, São Paulo, Brazil and Manaus, Amazonas, Brazil, using aluminum sulfate (Al2 (SO4)3) as clotting. Tests were made for fertility, elemental analysis and determination of micro and macro-nutrients and potentially toxic metals. The results showed that the sludge present agricultural potential and high levels of organic matter, and higher...(Complete abstract, click electronic access below)
This work characterized sludge discharges from water treatment plants at the town Jaboticabal, São Paulo, Brazil using ferric chloride (FeCl3) as clotting and at the town Taquaritinga, São Paulo, Brazil and Manaus, Amazonas, Brazil, using aluminum sulfate (Al2 (SO4)3) as clotting. Tests were made for fertility, elemental analysis and determination of micro and macro-nutrients and potentially toxic metals. The results showed that the sludge present agricultural potential and high levels of organic matter, and higher for the sludge of Manaus-AM, which has also presented greater degree of decomposition of organic matter. The levels of macro and micronutrients and potentially toxic metals and bioavailable are directly related to the type of clotting used in the conventional treatment of water and the characteristics of water. Humic substances from the sludges generated in water treatment plants were characterized by elemental analysis and thermal analysis, presenting to sample Manaus-AM greater degree of humification. The thermal stability came dependent on the type of treatment used in the sludge. Studies of complexation showed kinetics of 10 minutes for copper ions. For the ability to complexation one can establish the following order of affinity of humic substances by metallic ions: . Sludge generated in water treatment plants of Jaboticabal-SP: Fe <Al <Ca <Cu <Mn <Mg;This work characterized sludge discharges from water treatment plants at the town Jaboticabal, São Paulo, Brazil using ferric chloride (FeCl3) as clotting and at the town Taquaritinga, São Paulo, Brazil and Manaus, Amazonas, Brazil, using aluminum sulfate (Al2 (SO4)3) as clotting. Tests were made for fertility, elemental analysis and determination of micro and macro-nutrients and potentially toxic metals. The results showed that the sludge present agricultural potential and high levels of organic matter, and higher...(Complete abstract, click electronic access below)
Descrição
Palavras-chave
Química ambiental, Substâncias húmicas, Agricultura, Lodo de estação de tratamento de água
Como citar
BOTERO, Wander Gustavo. Caracterização de lodo gerado em estações de tratamento de água: perspectivas de aplicação agrícola. 2008. 68 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Química, 2008.