Evaluation of the Influence of Natural and Antrhopogenic Processes on Water Quality in Karstic Region

Calijuri, Maria Lúcia; Couto, Eduardo de Aguiar do; Santiago, Aníbal da Fonseca; Camargo, Rodrigo de Arruda; Silva, Marcos D. F. M. e

doi:10.1007/s11270-011-1012-5

Cited by 39 publications

(16 citation statements)

References 18 publications

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“…The hydrogeochemical evolution of groundwater is typically affected by natural factors including the composition of rain water, geological structure and mineralogy of aquifer, and water-rock interaction along the flow paths [2][3][4][5][6]. In addition to natural processes, anthropogenic activities can also strongly influence the hydrogeochemical characteristic of groundwater [4,5,[7][8][9][10]. In light of sustainable management of groundwater resources and scientifically challenging in complex karst settings, understanding the dominant processes that govern groundwater hydrogeochemical evolution is critically needed.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Jiang

Deng

et al. 2017

Water

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Abstract:In this study, the major chemical compositions of 159 shallow groundwater samples incorporated saturation index (SI) and Principal Component Analysis (PCA) were employed to evaluate the mainly geochemical processes that control the hydrogeochemical evolution of groundwater in a typical karst area, Bijie city, Guizhou Province. The groundwater samples in this study area were dominated of HCO 3 -Ca, HCO 3 -Ca-Mg, and HCO 3 -SO 4 -Ca types. The PCA suggested that four principal components could explain 88.85% of the total variance of 10 parameters, indicating that the hydrogeochemical evolution of groundwater was mainly controlled by the dissolution/precipitation of carbonates, gypsum, and halite minerals, cation exchange, and anthropogenic activities. To be specific, the enrichment of Ca 2+ , Mg 2+ , HCO 3 − and SO 4 2− in groundwater were primarily affected by the dissolution of dolomite and gypsum minerals, and the role of calcite dissolution was relatively weaker because most groundwater samples were saturated with respect to calcite. Besides, cation exchange was another factor that may affect the concentration of Ca 2+ and Mg 2+ in groundwater, and the concentration of SO 4 2− can also be influenced by coal mining activity. In addition, the concentrations of Na + and Cl − in groundwater were likely influenced by the dissolution of halite, cation exchange, and human activities.

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Section: Introductionmentioning

confidence: 99%

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Jiang

Deng

et al. 2017

Water

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“…Water quality is a topical issue in public health due to concerns emanating from the indiscriminate discharge of inadequately treated sewage into water bodies, which is deleterious to human health and the environment [2,3]. The lack of access to good quality water increasingly impaired by the presence of waterborne pathogens continues to be a major contributor to the disease burden, morbidity, the retardation of economic growth and the well-being of the populace in many developing countries [4].…”

Section: Introductionmentioning

confidence: 99%

Chlorine Tolerance and Inactivation of Escherichia coli recovered from Wastewater Treatment Plants in the Eastern Cape, South Africa

2017

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Featured Application: This study examined the tolerance of Escherichia coli isolates, a fecal indicator of water contamination, to chlorine as a common water disinfectant and the effectiveness of chlorine at different concentrations in eliminating E. coli in wastewater effluent. Data obtained can be used as baseline monitoring data for future epidemiological surveillances that could further enhance the control of E. coli and some bacteria species of public health concern in wastewater treatment plants and ensure protection of public and environmental health.Abstract: This study investigated the survival of Escherichia coli (E. coli) recovered from secondary effluents of two wastewater treatment plants in the Eastern Cape Province, South Africa, in the presence of different chlorine concentrations. The bacterial survival, chlorine lethal dose and inactivation kinetics at lethal doses were examined. The bacterial isolates were identified by 16S rRNA gene sequencing. Comparison of the nucleotide sequences of 16S rRNA gene of bacteria with known taxa in the GenBank revealed the bacterial isolates to belong to Escherichia coli. At the recommended free chlorine of 0.5 mg/L, reduction of E. coli isolates (n = 20) initial bacterial concentration of 8.35-8.75 log was within a range of 3.88-6.0 log at chlorine residuals of 0.14-0.44 mg/L after 30 min. At higher doses, a marked reduction (p < 0.05) in the viability of E. coli isolates was achieved with a greater than 7.3 log inactivation of the bacterial population. Inactivation kinetics revealed a high rate of bacterial kill over time (R 2 > 0.9) at chlorine dose of 1.5 mg/L. This study indicates poor removal of bacteria at free chlorine at 0.5 mg/L and a greater efficacy of 1.5 mg/L in checking E. coli tolerance.

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“…The cluster analysis technique was used to classify the examined parameters of groundwater into categories or clusters based on their similarities (Richard and Dean, 2002). Ward's method was used to carry out the CA (Lu et al, 2011) while the hierarchical agglomerative clustering with standardized Square Euclidean distance was used as a dissimilarity measure (Maria et al, 2011;Stephen and Brian, 2005). Dendrogram of the sampling locations model resulting from the CA of the measured parameters is shown in (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

Characterization of Groundwater Hydro-Chemistry and Quality Assessment in Eti –Osa, Lagos- Nigeria

Akotenyon¹

2013

Ethiop. J. Env Stud & Manag

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Water samples collected from forty-four hand dug wells using random sampling technique were measured for pH, electrical conductivity, total dissolved solids. Total hardness, calcium, chloride, bicarbonate and carbonates were analyzed using titrimetry method. Magnesium, potassium and sodium by Atomic Absorption Spectrophotometer while sulfate was analyzed using spectrophotometer. The study is aimed at characterization of groundwater hydrochemistry and quality assessment in Eti -Osa, Lagos-Nigeria using multivariate statistical techniques, piper diagram, surfer software and water quality indices. Factor 1 explains 71.19% of the total variance, with loading on TDS, Cl, Na, TH, SO 4 , Mg, EC, K and Ca while Factor II accounts for 13.731% of the total variance with moderate loading on HCO 3 ,CO 3 and pH. The residual sodium carbonate shows that 18.2%, 13.6% and 15.9% of the samples are suitable, marginal and unsuitable water respectively for irrigation purpose. Magnesium ratio shows that 75% of the samples are suitable while the remaining 25% are unsuitable for irrigation purpose. Computed water quality index shows that, 31.8% has excellent water quality, 50%, 15.9% and 2.3% indicate good, poor and water unfit for drinking respectively. The hydrochemical facies of the study area is characterized by Ca-HCO 3 and Ca-Cl types. It was concluded that water quality of the study area is unsuitable for irrigation whereas, it is suitable for domestic and drinking purposes. Appropriate treatment methods to make it more potable for human consumption, routine monitoring and periodic water quality testing coupled with appropriate treatment for agricultural activity should also be employed in the study area.

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Evaluation of the Influence of Natural and Antrhopogenic Processes on Water Quality in Karstic Region

Cited by 39 publications

References 18 publications

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Chlorine Tolerance and Inactivation of Escherichia coli recovered from Wastewater Treatment Plants in the Eastern Cape, South Africa

Characterization of Groundwater Hydro-Chemistry and Quality Assessment in Eti –Osa, Lagos- Nigeria

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