Interferências da codisposição de resíduos de fossa e tanque séptico em sistemas de lagoas anaeróbias seguidas de facultativas aeradas - Estudo de caso para a ETE- Anápolis
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2013-07-19
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Universidade Federal de Goiás
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The study aimed to assess the impact caused by the waste discharge from cesspools and septic
tanks into an anaerobic pond, followed by aerated facultative. Anápolis wastewater treatment
plant (WWTP) has two modules of anaerobic ponds followed by aerated facultative, but only
one received the waste. By going through a basket retainer of course solids, they were driven
directly to the receiver module ponds. The research was divided into three steps: first of all,
the system receiving the waste in both modules was evaluated with the rate application
volume (RAV) of 0.33%, then, the receiving pond received all of the waste volume disposed
in WWTP (RAV = 1.2%), finally the receiving pond was operated with the maximum organic
loading and RAV = 0,83%. Samples from different septic tank cleaning trucks were collected
and analyzed. Sludge deposited bathymetry was conducted in the anaerobic pond before and
after isolation of the modules. The surface scum bulk in the anaerobic pond was removed and
quantified. Initially, simple samples were collected from the influent and effluent of anaerobic
and facultative aerated ponds weekly, and then, when the receiver module received double
flow, samples were collected twice a week. Parameters analyzed were: BOD, COD,
Escherichia coli, pH, oil and grease, total phosphorus, amonniacal nitrogen, suspended solids
and settleable solids. Data from qualitative characterization of waste cesspools and septic
tanks were submitted to descriptive statistics, while referring to the ponds effluents were
analyzed by t-test statistical tool. The results indicated the characteristics of the waste are in
the range found by other authors, both in national and international literature. A negative
impact was evidenced on the receiving anaerobic pond effluent only for the parameters
ammonia and settleable solids with the RAV of 1.2%, however, with the rate of 0.82%, the
difference was significant for the parameters BOD and BOD in anaerobic ponds. There was
an increase in sludge generation of approximately 16% in the receiving anaerobic pond and
only 2.3% in the control. As for the scum, the average removal was approximately 450 L in
the receiving anaerobic pond and only 100 L in the control. The results showed no effect of
the co-treatment on the quality of treated sewage or in the operation and maintenance of the
WWTP. Furthermore, systems formed by an anaerobic pond followed by facultative aerated,
operating under the same conditions that Anápolis WWTP can be used for co-treatment of
waste from cesspools and septic tanks
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OLIVEIRA, Getúlio Henrique de - Interferências da codisposição de resíduos de fossa e tanque séptico em sistemas de lagoas anaeróbias seguidas de facultativas aeradas - Estudo de caso para a ETE- Anápolis. 2013. 86 f. Dissertação (Mestado em Engenharia do Meio Ambiente (EEC) - Universidade Federal de Goiás, Goiânia, 2013.