Caracterização química e ecotoxicológica dos resíduos gerados na Estação de Tratamento de Esgoto (ETE) de Goiânia/Go
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Data
2012-10-31
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Universidade Federal de Goiás
Resumo
Sewage treatment plants are considered on its own a source of
environmental pollution, generating damages to the environment, changing
the quality of potable water sources and soils. Based on this reality, the
present study evaluated the chemical and ecotoxicological characteristics of
a sewage treatment plant residues: effluent and sludge. The treatment plant
final effluent caused acute toxicity to Danio rerio, LD50;48h of 69,18% was
observed. Considering the complexity of the sludge matrix, a water elution
was done prior to the toxicity test. The resulting solution caused LD50;48h of
10,31% to Danio rerio, offering a mild toxicity for the species. Physicochemical
parameters such as, pH, TDS, hardness, condutivity and turbidity,
showed results within the environmental agency limits. As expected, soluble
oxygen in water was below the minimum established in both matrices, due to
the high amount of organic matter. During acute toxicity tests physicochemical
parameters were also tested, statistical simulations using pearson r
value showed strong and positive correlation between the parameter and the
test solutions concentrations. R values were between 0,974 and 1,000.
Except for soluble oxygen, that confirmed a negative correlation. Biochemical
and chemical oxygen demand were determined for the samples, a ratio
between them was obtained to evaluate the organic matter biodegradability
level. Considering that ratio under 5 indicates easily biodegradable matrix,
both matrice showed easy organic matter degradation, having ratio of 2,65
for final effluent and 2,01 for sludge water solution. The presence of toxic
metals, chromium, copper, cadmium, iron, nickel, tin, zinc and lead, were
investigated for effluent, sludge and sludge water solution. All metal
concentrations were below the environmental agency and reference safety
levels for disposal in rivers (CONAMA/357) or soils (CONAMA/375 and 430).
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SANTOS, Hugo de Melo. Caracterização química e ecotoxicológica dos resíduos gerados na Estação de Tratamento de Esgoto (ETE) de Goiânia/Go. 2012. 78 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2012.