masterThesis
Avaliação da prática do reúso com esgoto tratado em lagoas de estabilização no semiárido do Rio Grande do Norte
Fecha
2018-08-31Registro en:
SOUZA, Marcel Chacon de. Avaliação da prática do reúso com esgoto tratado em lagoas de estabilização no semiárido do Rio Grande do Norte. 2018. 67f. Dissertação (Mestrado em Engenharia Sanitária) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2018.
Autor
Souza, Marcel Chacon de
Resumen
The brazilian semi-arid region covers 88% of the counties of the state of
Rio Grande do Norte, marked by long periods of drought and irregular rains,
constantly living with water stress. One of the alternatives to minimize the
effects of lack of rains is the use of domestic treated sewage in agricultural
irrigation, producing food for animals and population in general. About this, is
importante to know the caracteristics of the raw sewage (affluent) and treated
sewage (efluente). Based on this needing, a monitoring plan was formulated for
four sewage treatment plants (STP) in Rio Grande do Norte’s state, three of
them located in cities of the semi-arid region (Caiçara do Rio do Vento,
Parelhas e Santana do Seridó) ando ne installed in a region between tropical
and semi-arid (Pedro Velho), all with the main reactor being a facultative
lagoon. The monitoring plan was carried out over twelve months, analyzing
affluent and efluente. Laboratory analyzes were performed to quantify the
Biochemical Oxygen Demand – BOD, Chemical Oxygen Demand – COD,
suspended solids, electrical conductivity, pH, amoniacal nitrogen, total
phosphorous, sodium, calcium, magnesium and thermotolerant coliforms. The
field visits subsidized, besides samples of collections, operational data on the
reuse of the treated sewage, aiming to understand the use of this effluent.
During the campaigns were also collected high-definition aerial images of the
systems with a drone, allowing to understand the area of reuse as a whole.
From these data, a profile was created for each county, which made it possible
to understand the practice of reuse. It was sought in literature and in National
and International laws parameters that would support the reuse of the effluent
with environmental and sanitary safety. It was concluded that the systems
studied, although promoting good efficiency in the removal of BOD and COD, in
the order of 81% and 69%, respectively, according to de STP, do not presente
adequate effluents to the agricultural reuse.