Avaliação do potencial do lodo oriundo de fossas/tanques sépticos domiciliares da Região Metropolitana de Cuiabá (RMC) para disposição final em solo agrícola

• Autor(a) principal: Silva, Joab Almeida da
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFMT
• Texto Completo: http://ri.ufmt.br/handle/1/652
• topic: Tratamento de lodo de fossa; Potencial agronômico de biossólido; Áreas potencialmente aptas para recebimento de biossólido; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA::RECURSOS HIDRICOS; Sludge treatment; Agronomic potential of biosolids; Areas able to receive biosolids

The sewage sludge is a hazardous waste according to NBR 10004/04, and when poorly managed, can adversely affect not only the environment and public health, to be the spread of disease agent. On the other hand, the sludge obtained from the sewage sludge is considered a great biofertilizer due to its composition, to be rich in organic matter nitrogen and phosphorus. This study aimed to evaluate the potential of the sludge coming from tanks / household septic tanks in the metropolitan region of Cuiabá (RMC) for final disposal on agricultural soils. The experiment of natural drying bed was developed in an outsourced laboratory with the aim of evaluating the quality of the sludge collected in pits neighborhoods Dom Aquino, Coxipó da Ponte, Morada da Serra, Boa Esperança and Jardim Universitário of septic tanks and transported by vehicles clean-pit. The experiment followed the same procedure in the treatment of sludge from sewage treatment plants. After this process, the material was sanitized with quicklime to 50% dry basis and undergo a maturation period of 30 days, then were subjected to laboratory analysis. The parameters were analyzed with respect to stability, the trace elements of metals and resistant pathogens. The results were compared with the current legislation standards. GIS techniques and geographic information systems (GIS) in order to identify potentially suitable for areas receiving biosolids were also used. According to the results, the drying bed natural exposure showed efficiency in dewatering and sludge stabilization, reaching levels lower than 10% humidity, the ratio between volatile and less than 0.10 total solids; with respect to the concentrations of trace elements of metals analyzed, all samples showed lower levels of biosolids to the maximum values allowed by CONAMA Resolution 375/06, including sample clean-truck fossa, which showed the highest levels of the analyzed parameters; after cleaning the sludge, the material presented quality Class A biosolids in relation to the concentration of pathogenic organisms; Finally, the study of the physical environment facilitated the disposal of biosolids at least 75.30% (2664.23 km ²) of the municipal area, while 24.70% (873,93km²) have restrictions because it is not local recommended for the application of this type of material.