Remoção de matéria orgânica de efluente de carcinicultura por meio de tratamento físico-químico (coagulação-floculação) e biológico (lodo ativado)
Shrimp farming is an activity that has become one of the main aquacultural activities because of the world population growth and the high demand for new food resources. However, the growth of this economic activity is followed by the increased concern about the environmental impacts the high volume...
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| 格式: | Dissertação |
| 語言: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| 在線閱讀: | https://repositorio.ufrn.br/handle/123456789/45777 |
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| 總結: | Shrimp farming is an activity that has become one of the main aquacultural activities because of
the world population growth and the high demand for new food resources. However, the growth of
this economic activity is followed by the increased concern about the environmental impacts the
high volume of wastewater can cause in the freshwater resources if it is not correctly treated.
Therefore, this work aimed to evaluate the efficiency of organic matter removal from a shrimp
farming effluent, using the coagulation-flocculation-sedimentation process with two coagulants -
one commercial (A) and a natural one produced from Moringa oleifera - in three levels of
coagulant concentration (30, 50, and 80 mg.L
-1
) and decantation time (35 min, 1 h, and 24 h).
Additionally, in parallel to this process, biological treatment was carried out through an activated
sludge system activated on bench scale, operating with a feed stream of 200 mL/day, a recycling
ratio of 1: 1, and a sludge age of 20 days. In the physicochemical treatment process, the maximum
efficiency of chemical oxygen demand (COD) removal was 78,44 and 77,44% for the natural and
A coagulants, respectively. The turbidity removal was 68,84 and 97,33% for the natural and A
coagulants, respectively. The optimum process condition for the natural and A coagulants was
obtained by using the lowest concentration (30 mg.L-1
) and the shortest decantation time (35 min),
which makes the process extremely viable and promising, considering the low costs and process
time. The biological treatment process presented an average efficiency of COD and total organic
carbon (TOC) removal of 92.84 and 95.90%, respectively, which proves the efficiency of the
activated sludge treatment. According to the CONAMA Resolution 430/2011, the shrimp farming
wastewater treated either A or natural coagulants based on M. oleifera, and by using the biological
treatment reached the environmental requirements for disposal in terms of organic matter removal. |
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