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Previous issue date: 2006-11-30 / Waste stabilization ponds are the main technology in use for domestic sewage treatment in Rio Grande do Norte State (RN), northeast Brazil. The are around 80 systems, constructed mainly by municipal city halls, being series comprised by a primary facultative pond followed by two maturation ponds the most used configuration. Due to problems related with the production and destination of sludge and generation of bad odors, the designers have avoided the use of anaerobic lagoons. The majority of systems are rarely monitored to verify their efficiencies and to get new project parameters for future designing. This work has as purpose to make a diagnosis of efficiency of three series of waste stabilization pond series (WSPS) of Jardim Lola 1, Jardim Lola 2 and Beira Rio, located in the North Zone of the city of the Natal/RN, treating domestic raw sewage, on the removal of organic matter and thermotolerant coliform, comparing the operational conditions of the systems this inside of the bands foreseen in the project, through parameters BOD5, QOD, thermotolerant coliforms, dissolved oxygen, pH, temperature, ammoniac nitrogen, total and suspended solids. The work was carried through in the WSPS, all constituted by a primary facultative pond followed by two maturation ponds. Socioeconomic characteristics of population are predominantly low and all the plants are very near of the contributing basins. The series were monitored from of May the November of 2002, totalizing 20 collections of grab samples of raw sewage and ponds effluents between 8:00 and 9:50 h. The main aspect to be detached by the results was the great concentration of organic matter (BOD and COD) and microorganisms the raw sewage which were around two times more concentrated than those values foreseen one in project. Considering all series the highest removals of organic matter were observed in system Beira Rio (84 and 78% of BOD and COD, respectively), which presented high hydraulic detention time (TDH = 89 days). On the other hand, Jardim Lola 1 and Jardim Lola 2 presented a much lower values of HDT (36 days and 18 days respectively) and their removals of BOD and COD were the same (76% and 60%, respectively). The Beira Rio WSPS, was the most efficient verified in relation to solids and ammonia, proving the great influence of the operational variables such as HDT and applied surface organic loadings on the performance of pond series. Although the treatment plants have reached efficiencies of thermotolerant coliforms around 99,999%, the concentrations in the final effluent can be considered very high for launching in aquatic bodies, particularly those produced by Jardim Lola 1 and Jardim Lola 2 series / O sistema de lagoas estabiliza??o ? o tipo de tratamento de esgoto dom?stico mais utilizado no Estado do Rio Grande do Norte, contando com 80 sistemas, constru?dos principalmente pelas prefeituras municipais, sendo o sistema de lagoas em s?rie constitu?das de lagoa facultativa prim?ria seguida de lagoas de matura??o um dos mais utilizados. Devido aos problemas relacionados com a produ??o e destino de lodo e gera??o de maus odores, os projetistas t?m evitado o uso de lagoas anaer?bias. Vale salientar que tais sistemas de lagoas comumente n?o s?o monitorados de forma adequada para verificar suas efici?ncias e obter dados para futuros projetos. Este trabalho tem como finalidade fazer um diagn?stico da efici?ncia de tr?s s?ries de lagoas de estabiliza??o na grande Natal, Jardim Lola 1, Jardim Lola 2 e Beira Rio, na remo??o de mat?ria org?nica e coliformes termotolerantes e, verificar se as condi??es operacionais dos sistemas esta dentro das faixas previstas no projeto, atrav?s dos par?metros DBO5, DQO, coliformes termotolerantes, oxig?nio dissolvido, pH, temperatura, nitrog?nio amoniacal, s?lidos totais e suspensos. Os sistemas estudados s?o constitu?dos por uma lagoa facultativa prim?ria seguida de duas lagoas de matura??o, que atendem a uma popula??o predominante de baixa renda a qual est? bem pr?xima da esta??o de tratamento de esgoto. As tr?s ETE s foram monitoradas no per?odo de maio a novembro de 2002, totalizando 20 coletas de amostras pontuais de esgoto bruto e efluentes das lagoas entre 8:00 e 9:50 h. Os principais aspectos a serem destacados no monitoramento foram a grande concentra??o de mat?ria org?nica e microrganismos nos esgoto brutos afluentes em rela??o ao previsto em projeto. Considerando toda a s?rie as maiores remo??es de mat?ria org?nica ocorreram no sistema Beira Rio (84 e 78% de DBO e DQO, respectivamente), que apresentava um TDH de 89 dias enquanto que os sistemas de Jardim Lola 1 e 2 eram de 36 dias e 18 dias respectivamente, foram determinadas remo??es semelhantes de DBO (76%) e de DQO em torno de 60%. O sistema Beira Rio tamb?m foi o mais eficiente na remo??o de s?lidos e de nitrog?nio amoniacal, comprovando a grande influ?ncia das vari?veis operacionais tais como tempo de deten??o hidr?ulica e carga org?nica aplicada, no desempenho dos sistemas de tratamento. Embora as esta??es de tratamento tenham atingido efici?ncias de coliformes termotolerantes em torno de 99,999%, as concentra??es nos efluentes finais podem ser consideradas muito elevadas para lan?amento em corpos aqu?ticos, particularmente as de Jardim Lola 1 e 2
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/16016 |
| Date | 30 November 2006 |
| Creators | Vale, Milton Bezerra do |
| Contributors | CPF:37695045268, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799320A6, Melo, Josette Lourdes de Sousa, CPF:10200720406, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787094H6, Guimar?es, Patr?cia, CPF:48204722400, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799468Z6, Ara?jo, Andr? Luis Calado |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-gradua??o em Engenharia Sanit?ria, UFRN, BR, Saneamento Ambiental; Meio Ambiente; Recursos H?dricos e Hidr?ulica |
| 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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