Tratamento de manipueira de fecularia em biodigestor anaeróbio para disposição em corpo receptor, rede pública ou uso em fertirrigação
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Data
2008-08-06
Autores
Pinto, Paulo Henrique Mendonça [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Manipueira de extração de fécula de mandioca, em separado da água de lavagem das raízes, através de biodigestores anaeróbios de fluxo ascendente, com separação das fases, sem controle de temperatura ou adição de produtos químicos e, avaliar sua adequabilidade, através das suas características físicas e químicas para lançamento em corpo receptor, sistema público coletor de esgotos ou, aplicação em processo de fertirrigação. Depois dos reatores estabilizados, foram realizados ensaios variando a vazão de alimentação com 8,0; 12,0 e 16,0 Ld-1, correspondentes a um tempo de retenção hidráulica de 8,17; 5,44 e 4,08 dias respectivamente. Os melhores resultados para redução da carga orgânica foram obtidos com os tempos de retenção hidráulica (TRH) de 8,17 e 5,44 dias com eficiências médias de 89,8 e 80,9% respectivamente. As características físicas e químicas dos efluentes tratados foram comparadas com os valores estabelecidos na legislação estadual, federal e, com os parâmetros utilizados pelo órgão ambiental fiscalizador. Os resultados obtidos mostraram que o efluente tratado atende parcialmente aos requisitos legais para o lançamento em corpos receptores, devido ao teor elevado de nitrogênio amoniacal. Por outro lado, foram atendidos integralmente os requisitos legais para o lançamento na rede pública coletora de esgotos. O efluente tratado não atendeu às recomendações requeridas pelo órgão ambiental fiscalizador para a sua disposição através de processo de fertirrigação devido aos teores elevados de ferro (Fe++) e de fluoretos (F-). Considerando os resultados obtidos, concluímos que, devido à simplicidade do sistema utilizado, com a implantação de melhorias como um pós tratamento, poderiam ser atingidos os parâmetros que atenderiam integralmente a legislação.
The aim of this paper was to evaluate the efficiency of the treatment of cassava wastewater, separately from the root washing water, by means of ascending flux anaerobic biodigesters, with separation of the phases, without temperature control or addition of chemical products and to evaluate its suitability by means of its physical and chemical characteristics for throwing in receiving body, public sewage system or application in fertilization and irrigation. After reactors had been stabilized, essays were conducted varying feeding flow with 8.0, 12.0 and 16.0 Ld-1, corresponding to a hydraulic retention time of 8.17, 5.44 and 4.08 days, respectively. The best reduction for organic load reduction were obtained with hydraulic retention times (HRT) of 8.17 and 5.44 days with mean efficiencies of 89.8 and 90.9%, respectively. Physical and chemical characteristics of treated effluents were compared with the values established in the current state and federal legislation and with the parameters used by the environmental supervising organ. The results we obtained showed that the treated effluent partially meets the legal requirements for throwing in receiving bodies owing to high contents of ammonia nitrogen. On the other hand, legal requirements were fully met to throw effluents into the public sewage system. The treated effluent did not fulfill the recommendations required by the environmental supervising organ for its disposal by means of fertilization and irrigation due to high concentrations of iron (Fe++) and fluorides (F-). Considering the results obtained, we conclude that, due to the simplicity of the system used, as improvements such as after-treatment are made, parameters fully obeying the legislation could be met.
The aim of this paper was to evaluate the efficiency of the treatment of cassava wastewater, separately from the root washing water, by means of ascending flux anaerobic biodigesters, with separation of the phases, without temperature control or addition of chemical products and to evaluate its suitability by means of its physical and chemical characteristics for throwing in receiving body, public sewage system or application in fertilization and irrigation. After reactors had been stabilized, essays were conducted varying feeding flow with 8.0, 12.0 and 16.0 Ld-1, corresponding to a hydraulic retention time of 8.17, 5.44 and 4.08 days, respectively. The best reduction for organic load reduction were obtained with hydraulic retention times (HRT) of 8.17 and 5.44 days with mean efficiencies of 89.8 and 90.9%, respectively. Physical and chemical characteristics of treated effluents were compared with the values established in the current state and federal legislation and with the parameters used by the environmental supervising organ. The results we obtained showed that the treated effluent partially meets the legal requirements for throwing in receiving bodies owing to high contents of ammonia nitrogen. On the other hand, legal requirements were fully met to throw effluents into the public sewage system. The treated effluent did not fulfill the recommendations required by the environmental supervising organ for its disposal by means of fertilization and irrigation due to high concentrations of iron (Fe++) and fluorides (F-). Considering the results obtained, we conclude that, due to the simplicity of the system used, as improvements such as after-treatment are made, parameters fully obeying the legislation could be met.
Descrição
Palavras-chave
Biodigestor, Manipueira, Mandioca, Biodigestion, Cassava wastewater, Cassava
Como citar
PINTO, Paulo Henrique Mendonça. Tratamento de manipueira de fecularia em biodigestor anaeróbio para disposição em corpo receptor, rede pública ou uso em fertirrigação. 2008. xiii, 87 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas de Botucatu, 2008.