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Evaluation of the water quality in Sergipe hinterland reservoirs, Northeast Brazil.

IWRA World Water Congress 2017 - Cancun Mexico
2. Water quality, wastewater and reuse
Author(s): Cristiane Cunha Nascimento
Silvanio Costa
Anairam Melo
Maria Caroline Mendonça
Helenice Garcia
Jose do Patrocinio Alves
Carlos Alexan
Cristiane Cunha Nascimento
Federal Institute of Sergipe
crisnascimentopop@gmail.com
Silvanio Costa
Federal University of Sergipe
silvanioslc@gmail.com
Anairam Melo
Technological and research institute of the State of Sergipe
anairam.melo@itps.se.gov.br
Maria Caroline Mendonça
Federal University of Sergipe
carolinesmendonca@gmail.com
Helenice Garcia
Federal University of Sergipe
helenicelgarcia@gmail.com
Jose do Patrocinio Alves
Federal University of Sergipe
jalves@ufs.br
Carlos Alexandre Borges Garcia
Federal University of Sergipe
carlosabgarcia@gmail.com


Keyword(s): Water quality, reservoirs, Northeast Brazil
Article: Poster:

Abstract

Population growth and technological development have consequences as intense and diverse use of aquatic ecosystems, such as reservoirs, causing a reduction in its water quality. Thus, it is necessary the conduct of monitoring and managing programs of these systems in order to improve it according to the various application purposes. In this work, samples were taken considering the dry and rainy seasons, between the years of 2013 and 2014, in the reservoirs "Cotton" and "Glory", located in Nossa Senhora da Glória city, Sergipe, Brazil. Trophic State Index (TSI) and Water Quality Index (WQI) were used. It was determined the parameters such as conductivity, dissolved oxygen, total nitrogen, total phosphorus and chlorophyll for each reservoir. Regarding the evaluated physicochemical variables established by Resolution number 357/05 of the National Environmental Council (CONAMA-Brazil) for rivers “class 2”, it was found that the reservoirs are dilapidated, with values much higher than allowed. These nutrients are indicators of the water body eutrophication phenomenon. TSI has been applied to the reservoirs and it was found that for Algodoeiro in the first and second collection campaign it was classified as mesotrophic. However, because of the increase of rainfall in 2014, mainly in August, this reservoir changed their condition to eutrophic, which may occur possible implications for water quality, but still at acceptable levels. On the other hand, Gloria reservoir is in a state of super-eutrophication, compromising its use for irrigation purposes. As for IQAR, the reservoirs were classified in Class IV, with rates ranging from 3.5-4.5 ("Algodoeiro") and 4.4-4.6 ("Gloria"), indicating a critically degraded environment or too polluted enabling corroborate the results of the EIT and underscoring the need for control measures of reservoir water quality. Regarding the WQI test, the reservoirs were classified in Class IV, with rates ranging from 3.5-4.5 (Algodeiro) and 4.4-4.6 (Glória), indicating a critically degraded or heavily polluted environment, which corroborate with the results found by TSI, indicating the need for constant monitoring of reservoir water quality.

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