Simulação de alterações numa ETA convencional de porte médio para a produção de água segura / Changes simulation in a conventional ETA midsize to safe water production

Nascimento, Ruth Silveira do; Curi, Rosires Catão; Curi, Wilson Fadlo; Oliveira, Rui de; Santana, Cícero Fellipe Diniz de; Meira, Celeide Maria Belmont Sabino

doi:10.21168/rbrh.v21n2.p439-450

Cited by 6 publications

(8 citation statements)

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“…Thus, the high values of k 1 obtained in the fit of the models to the data are coherent. In addition, the value of the kinetic constant associated with reactions involving organic compounds in the raw water of the water supply system of Campina Grande is 5% (Nascimento et al 2016), attesting that inorganic compounds are responsible for most of the chlorine demand.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, this station is responsible for supplying nine municipalities in the state of Paraíba, including Campina Grande, which has a medium-sized supply system and benefits 156,298 economies, through 135,532 home connections (Nascimento et al 2016) with an estimated population of 409,731 inhabitants for the year 2019 (IBGE 2020). Some physical-chemical and microbiological characteristics of the water used to conduct the tests are presented in Table 1, with their respective average values.…”

Section: Experimental Conditions and Proceduresmentioning

confidence: 99%

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Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

et al. 2021

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Disinfection process is used in the treatment of water for human supply to promote sanitary safety and provide users with drinking water that meets potability standards. Thus, it is necessary to sustain a minimal concentration of free residual chlorine (FRC) throughout the entire distribution system. The present study investigated the decay process of FRC concentration in water destined for human supply. The decay was evaluated in bench-scale testing, using sodium hypochlorite, calcium hypochlorite, sodium dichloroisocyanurate (organic chlorine) as disinfectant agents, and also an alternative disinfectant solution (ADS) produced in loco, with oxidizing and disinfectant properties, which is being used in Brazilian sanitation industry. To evaluate the decay, four models were fitted: first-order, nth-order, limited first-order and parallel first-order, hence determining the corresponding parameters which describe the decay speed of the FRC concentration in water. Achieved results demonstrated that all models were statistically significant and predictive. However, parallel first-order model produced the best fit. Regarding the evaluated disinfectants, it was noted the preeminence of ADS solution when compared to the others, since it imparted a higher FRC over time, a behavior indicated by lower values for reaction rate constant in all models and when compared to other disinfectants used in this study.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Conditions and Proceduresmentioning

confidence: 99%

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

et al. 2021

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“…Another parameter that drew attention was the free residual chlorine, which presented 72 non-compliant samples, highlighting that during transport the water undergoes a process of degradation of its quality, due to the detention time and the state of conservation and maintenance of the network, representing a risk to the health and safety of the supplied population (Nascimento et al, 2016).…”

Section: Variablesmentioning

confidence: 99%

Development of a Water Quality Index (WQI) for public supply in the Vale do Rio Pardo region, RS, Brazil

Klamt¹,

Lobo²,

Costa³

2021

Rev. ambiente água

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This research developed a Water Quality Index (WQI) for public supply in the Vale do Rio Pardo Region, RS, Brazil (WQI-VRP), from the database of the 13th Regional Health Coordination, totaling 1175 samples. A filtration process resulted in 285 samples with the variables free residual chlorine, turbidity, apparent color, pH, fluoride, total coliforms and Escherichia coli. For water consumption purposes, the Water Quality Index developed by the Sanitation Company of Goiás, Brazil, was used. A multivariate calibration of the weights of importance of the parameters included in the original index was performed, resulting in the WQI-VRP. Comparing the medians of the two indexes, it was found that there were significant differences (p<0.05), qualifying the WQI-VRP as more restrictive. The results indicated that 89.8% of the samples were classified as non-compliant samples by WQI-VRP, while 10.2% were classified as compliant samples. Of the 285 samples analyzed, 72 samples of chlorine, 12 of total coliform, 5 of E. coli, 2 of color, 200 of fluoride and 26 of pH, were below or above the minimum or maximum values required by Brazilian legislation. The pH and fluoride correspond to the critical variables of the study region, as they were the parameters that showed the greatest increases in relative weights when comparing the original index with the calibrated one. These results confirm the use of the WQI-VRP as an efficient tool to assess the quality of drinking water in Brazilian subtropical and temperate lotic systems.

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“…A operação dos reservatórios é um fator que deve ser levado em consideração na avaliação da degradação da qualidade da água. Reservatórios que operam como poço de sucção permitem grande renovação da água; já reservatórios operados em batelada, em ciclos de enchimento/ esvaziamento, favorecem a estagnação e, consequentemente, a maior degradação da qualidade e uma maior demanda de cloro residual livre (NASCIMENTO et al, 2016). A determinação dos coeficientes cinéticos de degradação de cloro residual livre foi realizada por meio de ajustes de modelos, de 1ª ordem, 1ª ordem limitada, 1ª ordem paralela e ordem n, aos dados experimentais obtidos pelo teste da garrafa, sendo esses ajustes realizados com base no método dos mínimos quadrados, e os parâmetros de cada modelo estimados por meio da minimização da soma dos quadrados dos resíduos utilizando a ferramenta "Solver" do software Microsoft Excel 2013 pelo método "trial and error", conforme detalhado no parágrafo seguinte.…”

Section: Degradação Da Qualidade Da áGua Em Reservatórios De Distribuunclassified

“…A água na saída de uma estação de tratamento de água (ETA) é geralmente de boa qualidade e livre de contaminantes. Entretanto, durante o transporte, a água sofre um processo de degradação de sua qualidade devido ao tempo de detenção e ao estado de conservação e manutenção da rede, podendo representar risco à saúde e à segurança da população abastecida (MUNA-VALLI e KUMAR, 2004;NASCIMENTO et al, 2016;AL-JASSER, 2007).…”

Section: Introductionunclassified

Simulação do decaimento de cloro residual livre em reservatórios de distribuição de água

Silva¹,

Meira²,

Santana³

et al. 2019

RDAE

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Simulação de alterações numa ETA convencional de porte médio para a produção de água segura / Changes simulation in a conventional ETA midsize to safe water production

Cited by 6 publications

References 0 publications

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

Development of a Water Quality Index (WQI) for public supply in the Vale do Rio Pardo region, RS, Brazil

Simulação do decaimento de cloro residual livre em reservatórios de distribuição de água

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