Characteristics of WWTP sludge after drying in greenhouse for agricultural purposes

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 greenho...

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Bibliographic Details
Published in:Water science and technology 2012-01, Vol.66 (7), p.1460-1466
Main Authors: Lima, Márcia Regina Pereira, Zandonade, Eliana, Sobrinho, Pedro Alem
Format: Article
Language:English
Subjects:
Activated sludge
Agriculture - methods
Brazil
Drying
Evaluation
Farm buildings
Greenhouses
Hydrogen-Ion Concentration
Metropolitan areas
Sewage
Sewage treatment
Sewage treatment plants
Sludge
Sludge digestion
Solar radiation
Volatile solids
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
Wastewater treatment plants
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Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2012.326