2015) Water quality and trophic state of a tropical urban reservoir for drinking water supply (Juiz de Fora, Brazil), Lake and Reservoir Management, 31:2, 134-144, AbstractBucci MMHS, Delgado FEdaF, and Oliveira LFCde 2015. Water quality and trophic state of a tropical urban reservoir for drinking water supply (Juiz de Fora, Brazil). Lake Reserv Manage. 31:134-144.The Dr. João Penido Reservoir is an 80-year-old tropical impoundment that serves as the main drinking water supply for the city of Juiz de Fora, Brazil. The reservoir is an important environment for the region, serving as a study site for the scientific community. The main objective of this research was to calculate quality indices for water and the trophic state of the reservoir. We performed physical-chemical and microbiological analyses on water samples collected at 5 points in the reservoir between July 2011 and March 2013, a period that characterizes both dry and rainy periods. The parameters analyzed were water temperature, dissolved oxygen, pH, turbidity, total solids, biochemical oxygen demand, nitrate, total phosphorus, chlorophyll a, thermotolerant coliforms and total coliforms. Indices modified for tropical waters, the Water Quality Index (WQI Igam ) and the Trophic State Index (TSI Lamp , a variation of the Carlson Index typically used for temperate zones) were calculated for each sample. The results showed the prevalence of a "mesotrophic" state and a "medium" level of water quality in the Brazilian reservoir. It is likely that the age, forms of use, and occupation of the watershed have produced negative impacts on the aquatic ecosystem over the last 80 years. Water quality clearly demonstrates the safety and environmental health of a watershed. This study presents data on the water quality and trophic state of the Dr. João Penido Reservoir and provides guidelines for developing and implementing an integrated management plan for the preservation of its watershed.
Análise de metais, agrotóxicos, parâmetros físico-químicos e microbiológicos … Rev. Ambient. Água vol. 10 n. 4 Taubaté -Oct. / Dec. 2015 interferem no ecossistema aquático. Este estudo fornece subsídios para o planejamento de ações visando a preservação e recuperação da qualidade hídrica do manancial.Palavras-chave: bacia hidrográfica, impactos, manancial de abastecimento, preservação, qualidade das águas. Analysis of metallic, pesticide, physico-chemical and microbiologicalparameters of waters near the Dr. John Penido Dam, Juiz de Fora, MG ABSTRACT The Dr. John Penido Dam is the main source of water supply of the city of Juiz de Fora, located in southeastern Brazil. This study analyzed metals, agro toxics, and some physico-chemical and microbiological parameters in water samples taken near the dam, and checked their conformity to limits specified in the pertinent legislation (Brasil, 2004;2011;CONAMA, 2005). Eight samples were collected at five points of the reservoir between July 2011 and March 2013. The following physicochemical and microbiological parameters were analyzed: water temperature, dissolved oxygen, pH, conductivity, color, turbidity, total solids, demand biochemical oxygen, nitrate, nitrite, ammonia, total nitrogen, total phosphorus, chlorophyll a, total and thermo-tolerant coliforms. Every agro toxic mentioned in Ordinances MS/GM 518/2005 and 2.914/2011 of the Ministry of Health (Brazil, 2004;2011) was analyzed. The total and dissolved metals tested included: copper, chromium, cadmium, lead, nickel, zinc, manganese, iron, sodium, potassium and calcium. The correlation between the results was accomplished using data mining technique (Data Mining). The results showed that the levels of metals in the water are below the CONAMA parameters, with exceptions of iron and zinc. The following other parameters also showed disagreement: biochemical oxygen demand, dissolved oxygen, total phosphorus and thermo-tolerant coliforms. Agro toxics were also below the limits of quantification of the methods employed, and were therefore within the limits established by the Ministry of Health Ordinances. The results and correlations indicate that the weathering, runoff and forms of use and occupation of the watershed interfere with the aquatic ecosystem. This study provides information useful to planning the preservation and restoration of the water quality of the supply source.
bacias hidrográficas, como é o caso da bacia da represa Dr. João Penido, situada do município de Juiz de Fora (Minas Gerais). Não há estudos sistematizados sobre a qualidade das águas do manancial, tornando-o desconhecido para a comunidade científica.O reservatório foi construído em 1934 e desde então, vem sofrendo processos de degradação através das interferências antrópicas, apesar de estar protegido por leis municipais, estaduais e federais. Este fato pode ser evidenciado através das ocupações irregulares às margens dos corpos d'água, erosões, ausência de mata ciliar, assoreamento, bem como a proliferação de macrófitas aquáticas nas regiões de entrada dos tributários e em vários pontos do espelho d'água, indicando possível estado de eutrofização. Este fato vem causando grande preocupação, uma vez que o manancial é responsável por 65 % do abastecimento público de água potável da cidade [6].Tendo em vista a sua importância e o cenário atual em que se encontra a represa Dr. João Penido, este trabalho foi estruturado apresentando o objetivo principal de verificar a interferência antrópica na qualidade de suas águas. Para isso, foram delineados quatro objetivos específicos: caracterizar a qualidade das águas INTRODUÇÃOO constante crescimento pela demanda de água implica na necessidade de aumentar a disponibilidade deste recurso, tendo em vista os seus múltiplos usos. Por um lado, isso representa o progresso através da construção de barragens para diversas finalidades. Em contraposição, acarreta uma série de impactos nos ecossistemas naturais decorrentes da transformação de um ambiente lótico em lêntico, provocando alterações no comportamento natural e na qualidade hídrica dos rios e córregos represados [1].Embora o uso mais nobre que se possa dar a um recurso hídrico seja o consumo humano, os mananciais para abastecimento público no Brasil têm apresentado progressiva deterioração da qualidade de suas águas [2]. Dentre as práticas que comprometem a qualidade da água de bacias hidrográficas, podem ser citados o despejo de efluentes domésticos, o uso de fertilizantes, agrotóxicos e pesticidas, dentre outros [3][4][5]. Desta forma, a preocupação com a degradação dos ambientes aquáticos tem crescido no meio científico.Outra questão relevante é que existe uma grande carência de informações a respeito de pequenas Dr. João Penido dam is the main reservoir for water supply of Juiz de Fora (MG). The forms of land use and occupation have produced negative impacts on the aquatic ecosystem. The general objective of this study was to assess the anthropogenic impact on water quality of the watershed. To this was done to characterize the quality of its waters and the parameters measured were compared with CONAMA Resolution 357/2005. It was also calculated the Water Quality Index (WQI) and the Trophic State Index (TSI). The monitoring tool has proved essential in actions involving preservation of the watershed. Ouvir Ler foneticamente
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