The sludge generated by sewage treatment which meets regulatory standards can be used in agriculture. With this understanding, the focus of this study is the evaluation of the agricultural characteristics and inorganic substances in excess activated sludge, which was subjected to drying in a greenhouse. The variables (factor) evaluated during the drying process were: type of sludge (digested or not digested), addition of lime to the sludge, and the physical layout and rotation of sludge in the greenhouse. The parameters monitored for this assessment were moisture, volatile solids and pH. The greenhouse cover and sides were made of translucent plastic to allow the penetration of solar radiation and prevent water from entering. A impermeable floor was used. The sludge was generated in sewage treatment plants located in the metropolitan region of Grande Vitória, Espírito Santo, Brazil. The solar drying of wastewater sludge in a greenhouse presented satisfactory results.
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Research Article|
October 01 2012
Characteristics of WWTP sludge after drying in greenhouse for agricultural purposes
Márcia Regina Pereira Lima;
1Av. Vitória, 1729, Jucutuquara, Vitória – ES, CEP 29040-780 Brazil
E-mail: marcialima@ifes.edu.br
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Eliana Zandonade;
Eliana Zandonade
2Universidade Federal do Espírito Santo, Av. Fernando Ferrari, 514 - Goiabeiras, Vitoria, Brazil
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Pedro Alem Sobrinho
Pedro Alem Sobrinho
3Departamento de Engenharia Hidráulica e Ambiental da Escola Politécnica, Universidade de São Paulo, São Paulo, Brazil
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Water Sci Technol (2012) 66 (7): 1460–1466.
Article history
Received:
January 31 2012
Accepted:
May 03 2012
Citation
Márcia Regina Pereira Lima, Eliana Zandonade, Pedro Alem Sobrinho; Characteristics of WWTP sludge after drying in greenhouse for agricultural purposes. Water Sci Technol 1 October 2012; 66 (7): 1460–1466. doi: https://doi.org/10.2166/wst.2012.326
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