LIRA, V. V.; http://lattes.cnpq.br/3962961821390867; LIRA, Valnyr Vasconcelos.
Resumo:
In this dissertation, a wastewater treatriient system is presented. K. consists of an
anaerobic process, accomplished by an UASB reactor, in series with an aerobic process,
iiiiplemeiited by asequencing batcli reactor. The UASB reactor was cliosen as the anaerobic
process because it's a system of great potenfial for áreas of hot cliniafe, as the Northeast
arca. The sequencing batcli reactor was used as aerobic process since it is the simplest
version of the activated sludgc systeins. The use of a lrybrid system, that is, an anaerobicaerobic
one, seeks the reduction of the construction and operation costs of the treatment
plant. In this case, great part of the wastewater organic material is removed in the anaerobic
process, so that, the aeration tanks and the amount of oxygen needed for the aerobic stage
are smaller.
The automation of this treatment system was iniplemented. As the anaerobic process
doesn't use electric nor mechanical equipments, the automation isjust limited to the aerobic
process, that is, to the sequencing batch reactors. It is possible to operate the system
automatically, or remotely through a computer running a supervisory system.
Besides the automation, a new technique for determing the end of the aeration period
was presented in this dissertation. This technique, difFerently from the classic techniques,
has no need to estimate parameters as the respiration rate or the oxygen transfer function.
In this case, the average value of the oxygen dissolved concentration in the reactor indicates
when the aeration should be interrupted. Then, with this technique, the system is capable
to treat a larger wastewater volume by day, besides saving energy.