Estudo em escala real da disposição de resíduo de decantador de ETA em lagoa de estabilização de esgoto
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2015-04-29
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Universidade Federal de Goiás
Resumo
In Brazil water treatment plants (WTP) residuals are usually discharged into
waterways, with negative impacts on water quality, aquatic biota and sediments, which may
also pose risks to human health. This paper presents a study on real scale disposal of
aluminum sludge from the settling of a WTP in a primary facultative pond, both located in
Piracanjuba-GO, wishing to contribute as an alternative for residuals management. The study
aimed to evaluate the effects of WTP residuals (WTPR) in the performance of the wastewater
stabilization pond (WSP), in terms of quality of the effluent and volume of bottom sludge
accumulated. Worked up in two identical parallel ponds, one in which WTPR was applied
(test pond) and another without application (control pond) to serve as comparison of results.
The study was carried out in two stages, with dosage of 37 mg TS/L in Phase 1 and
44 mg TS/L in Phase 2, totaling 125 days of application and 191 days of monitoring. It was
evaluated several effluent parameters such as BOD, solids, nitrogen, total phosphorus,
Escherichia coli, metals, among others. Sludge volumes in the ponds were obtained from
bathymetric survey using a sludge depth meter (sludge gun) and modeling by Surfer 8.0
software. The addition of the WTPR did not impair the performance of the test pond, with
minimal reduction of BOD and nitrogen. It was not possible to identify any influence of
WTPR for the removal of total phosphorus of the sewage, which was attributed to high pH
and low dosage. There was no statistical difference (95% confidence level) between the
means of 15 parameters evaluated in two phases, except for nitrogen ammonia. There was no
difference between the increases of sludge volume accumulated in the bottom of the ponds,
although total solids content was higher in the test pond. This behavior was associated with
particle size characteristics of the material. The study indicates technical feasibility of WTP
residuals disposal in the WSP studied, revealing an alternative for its management that can
also be applied in other same type systems if evaluated the specific conditions in each case.
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Citação
ANGELIM, Susane Campos Mota. Estudo em escala real da disposição de resíduo de decantador de ETA em lagoa de estabilização de esgoto. 2015. 133 f. Dissertação (Mestrado em Engenharia do Meio Ambiente) - Universidade Federal de Goiás, Goiânia, 2015.