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Previous issue date: 2010-10-22 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Leachates are effluent produced by decomposition of solid waste, they have complex
composition and can be highly toxic. Therefore such percolated liquid should be collected
and treated properly to avoid environmental contamination of soil and of water bodies.
The objective of this study was to evaluate the toxicity through ecotoxicological tests with
Ceriodaphnia dubia (Cladocera - Crustacea) of percolated liquids generated in two
different systems of municipal solid waste (MSW) disposal in the city of Natal/ RN: A
Sanitary Landfill in the Metropolitan Region of Natal/ RN, and in a dump off area.
Furthermore, it was evaluated the possible contamination of the underground water of the
dump off area. Two monthly samples were taken at four points between the months of
May/2009 and January/2010. The Point "A" corresponds to the end of the pond leachate
treatment in ASRMN; The Point "B" corresponds to a containment pond at the dump. The
Point "C" is an area near one of the cells of the dump off area where the leachate
outcrops; The Point "D" stands for an underground water well at the area. The last point,
called "E" was sampled only once and corresponds to the slurry produced by temporary
accumulation of solid waste in the open area of the dump. The ecotoxicological tests,
acute and chronic, followed the ABNT 13373/2005 rules, with some modifications. The
samples were characterized by measuring the pH number, the dissolved oxygen (DO), the
salinity, BOD5, COD, Cd, Cu, Pb, Cr, Fe, Mg, Ni, and Zn. At Point A, the average number
of EC50-48h ranged between 1.0% and 2.77% (v/v), showing a high toxicity of the leachate
to C.dubia in all months. To this point, positive correlations were found between the EC50-
48 with precipitation. Negative correlations were found between the EC50- 48h with
salinity. At point B there was no response of the acute exposure of organisms to the test
samples. At point C the EC50-48h ranged from 17.68% to 35.36% in just two months of the
five ones analyzed, not correlated meaning. Point D, the EC50-48h level ranged between
12.31% and 71.27%, showed a negative correlation with, only, precipitation. Although it
was observed toxicity of underground water in the Landfill Area, there was no evidence of
water contamination by leachate, however, due to the toxic character of this water,
additional tests should be conducted to confirm the quality of water that is used for human
supply. At point E there was no acute toxicity. These results support the dangers of
inappropriate disposal of MSW to water bodies due to the high toxicity of the leachate
produced highlighting the necessity of places of safe confinement and a treatment system
more effective to it / chorume produzido pela decomposi??o de res?duos s?lidos ? um l?quido de forma??o
complexa e altamente t?xico, que deve ser coletado e tratado adequadamente para evitar
contamina??o ambiental de solos e corpos aqu?ticos. O objetivo deste trabalho foi avaliar
a ecotoxicidade de efluentes gerados em dois diferentes sistemas de disposi??o de
res?duos s?lidos do munic?pio de Natal/RN, bem como verificar a poss?vel contamina??o
de um po?o de abastecimento de ?gua localizado em um desses sistemas, atrav?s de
testes de toxicidade com Ceriodaphnia dubia (Cladocera - Crustacea). Duas coletas
mensais foram realizadas em quatro pontos entre os meses de Maio/2009 e
Janeiro/2010, sendo o ponto A o chorume tratado no Aterro Sanit?rio da Regi?o
Metropolitana de Natal (ASRMN), o B uma lagoa de conten??o no lix?o, o C chorume que
brota em uma c?lula do lix?o, o D o po?o subterr?neo no lix?o. Um ac?mulo de lixo
tempor?rio a c?u aberto gerou produ??o de chorume, que foi coletado uma ?nica vez,
sendo denominado ponto E. Os testes ecotoxicol?gicos agudos seguiram a norma da
ABNT 13373/2005, com algumas modifica??es. As amostras foram caracterizadas
medindo pH, OD, salinidade, DBO5, DQO, Cd, Cu, Pb, Cr, Fe, Mg, Ni, e Zn. No ponto A, a
m?dia da EC50-48h variou entre 1,0% e 2,77% (v/v), mostrando uma alta toxicidade do
percolado para a C.dubia em todos os meses. Uma correla??o positiva foi encontrada
entre o EC50-48h com a precipita??o, uma negativa com a salinidade. No ponto B n?o
houve resposta aguda. No ponto C a CE50-48h variou de 17,68% a 35,36% em apenas
dois meses dos cinco analisados e n?o apresentou correla??o significativa. No ponto D a
CE50-48h variou entre 12,31% e 71,27% e mostrou uma correla??o negativa apenas com
a precipita??o. Os valores dos par?metros f?sico-qu?micos do ponto D n?o indicam
contamina??o da ?gua pelo chorume produzido no lix?o, por?m, devido ao car?ter t?xico
dessa ?gua, testes complementares devem ser feitos para confirmar a qualidade da ?gua
que ? usada para abastecimento humano. No ponto E n?o houve toxicidade aguda. Os
resultados afirmam o perigo do descarte inadequado de RSU para os corpos aqu?ticos
devido sua alta toxicidade e a necessidade de um sistema de tratamento mais eficaz no
ASRMN
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12494 |
| Date | 22 October 2010 |
| Creators | Mendon?a, Ja?sa Mar?lia dos Santos |
| Contributors | CPF:12243214806, http://lattes.cnpq.br/2543467420133635, Medeiros, Guilherme Fulg?ncio de, CPF:03935531400, http://lattes.cnpq.br/1731390914884781, Becker, Vanessa, CPF:71502076004, http://lattes.cnpq.br/2999389235108507, Bertoletti, Eduardo, CPF:67421237887, http://lattes.cnpq.br/6954478217916713, Panosso, Renata de F?tima |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Bioecologia Aqu?tica, UFRN, BR, Bioecologia Aqu?tica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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