Assessment of the Impacts of Sewerage Network on Groundwater Quantity and Nitrate Contamination: Case Study of Tehran

Khorasani, Hamed; Kerachian, Reza; Aghayi, Mohammad Mahdi; Zahraie, Banafsheh; Zhu, Zhenduo

doi:10.1061/9780784482964.006

Cited by 15 publications

(4 citation statements)

References 10 publications

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“…Based on the results of geovisualization, our study showed a high level of contamination of the groundwater resources of the settlement in the period without sewerage, which is in accordance with similar studies carried out in municipal environment [23,26,28]. Data from studies on groundwater quality change following the construction of the sewerage network showed positive changes in groundwater quality, similar to our own results [11]. At the same time, it is important to mention that literature on improved water quality after sewerage is limited, which is one of the reasons why our long-term monitoring results can be important additions to the literature and may draw widespread interest.…”

Section: Discussionsupporting

confidence: 91%

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Possibilities for Assessment and Geovisualization of Spatial and Temporal Water Quality Data Using a WebGIS Application

Balla

Zichar

Kiss

et al. 2022

IJGI

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The provision of webGIS-based water quality data services has become a priority area for both the public and administrative sectors in the context of the pandemic emergency associated with the global spread of COVID-19. Current geographic, monitoring and decision supporting systems, typically based on web-based geospatial information, greatly facilitate the sharing of spatial and temporal data from environmental databases and real-time analyses. In the present study, different water quality indices are determined, compared and geovisualized, during which the changes in the quality of the shallow groundwater resources of a settlement are examined in the period (2011–2019) in an eastern Hungarian settlement. Another objective of the research is to determine three water quality indices (Water Quality Index, CCME Water Quality Index, Contamination degree) and categorize water samples based on the same input spatial and temporal data using self-developed freely available geovisualization tools. Groundwater quality was assessed by using different water quality indices. Significant pollution of the groundwater in the time period before the installation of a sewage network was shown. Regarding water quality, significant positive changes were shown based on all three water quality indices in the years after installing a sewage network (2015–2019). The presence of pollution apart from the positive changes suggests that the purification processes will last for a long time.

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Section: Discussionsupporting

confidence: 91%

“…In addition, knowledge of the baseline condition is necessary to assess the water quality changes, but most municipalities do not have such a settlement-wide spatial and temporal water quality data or geodatabase thus making comparative analysis impossible. One of the aims of our study is to fill this scientific gap [11].…”

Section: Introductionmentioning

confidence: 99%

Possibilities for Assessment and Geovisualization of Spatial and Temporal Water Quality Data Using a WebGIS Application

Balla

Zichar

Kiss

et al. 2022

IJGI

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“…Moreover, the potential for pharmaceuticals to reach and contaminate the groundwater depends also on geology and hydrology [31], the location of the water table [32], population density [23], demographic characteristic [33] and drug consumption patterns [34]. However, few studies have investigated the factors that affect drugs entering the sewage stream and reaching the groundwater resource [35]. Vatovec et al [33] investigated the effect of demographic changes and people's drug disposal practices on the volume of different pharmaceuticals entering the aquatic environment via wastewater discharges.…”

Section: Introductionmentioning

confidence: 99%

Carbamazepine Levels Related to the Demographic Indicators in Groundwater of Densely Populated Area

Ebrahimzadeh

Castiglioni

Riva

et al. 2021

Water

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Consumption of pharmaceuticals by people is growing. Carbamazepine (CBZ) is an extensively used anti-epileptic drug that is recalcitrant to degradation. As a result, CBZ has been widely detected in the aquatic ecosystem due to its daily consumption and drainage in sewage systems. Leakages from sewage networks and septic tanks may represent one of the main sources of CBZ in groundwater. In this study, CBZ concentrations in groundwater and their correlations with the demographic structure of the population were investigated in the densely populated Milan urban area. Seventy-six demographic variables were retrieved from the Italian Population and Housing census. Twenty-one groundwater samples were collected from unconfined and semi-confined aquifers of the Milan area and the concentration of CBZ was measured. Groundwater CBZ levels in both aquifers were associated with the demographic data within a circular buffer with a radius of 1.5 km. All data were analyzed using a multivariate statistical approach. The results showed a significant association (p < 0.05) between CBZ concentrations and specific demographic segments of the population. Higher CBZ concentrations were found to be associated with the population aged 70 years and over (aging index), and with families having children aged under 5 years (family index). In addition, the divorce index was correlated with the high concentration of CBZ, whereas the educated and sexagenarian population showed a negative correlation. Our results indicated that the contamination of CBZ follows the same pattern in unconfined and semi-confined aquifers, which are used for drinking water purposes in Milan area. Therefore, changing the CBZ consumption pattern or replacing CBZ with other drugs may strongly influence groundwater contamination of the investigated area.

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“…Although groundwater monitoring is of great interest to water decision-makers for establishing strategies to protect water resources, due to the high costs there is not enough data available at a sufficient level of detail, especially for long-term monitoring [26,27]. For this reason, only few studies have been conducted to assess the impact of the sewerage network on groundwater [28,29]. In addition, knowledge of the baseline condition is necessary to assess the changes, but most municipalities do not have such a settlement-wide data making comparative analysis impossible.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Shallow Groundwater Purification Processes after the Construction of a Municipal Sewerage Network

Mester

Szabó

Balla

2021

Water

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In the present study, the impact of the construction of the sewerage network (2014) on groundwater quality was studied on the example of a middle-sized settlement in the Great Hungarian Plain and changes in water quality were assessed using GIS and multivariate statistical analysis. As a result of the pollution that has been going on for decades, the groundwater supply of the municipality has become heavily polluted. In the period before sewerage (2011–2013), clear spatial differences were shown in the degree of contamination in the area of the settlement: the degree of contamination increased in the direction of local groundwater flow. Based on our results, the construction of the sewerage network resulted in marked changes in the quality of groundwater wells. Our studies showed a clear decrease in the concentrations of inorganic pollutants (NH4+, NO2−, NO3−, PO43−). In the fifth year of the post-sewerage period (2019), the clear spatial difference between wells was eliminated. We have observed a strong descent (1.5 to 2 m) in groundwater levels in the post-sewerage period, the reason for that is clearly due to that wastewater outflow was eliminated. On this basis, it can be declared that the purification processes in the area have started, but at the same time, our results show that pollutants entering environment undergo a number of transformations and remain in the system for a long time.

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Assessment of the Impacts of Sewerage Network on Groundwater Quantity and Nitrate Contamination: Case Study of Tehran

Cited by 15 publications

References 10 publications

Possibilities for Assessment and Geovisualization of Spatial and Temporal Water Quality Data Using a WebGIS Application

Possibilities for Assessment and Geovisualization of Spatial and Temporal Water Quality Data Using a WebGIS Application

Carbamazepine Levels Related to the Demographic Indicators in Groundwater of Densely Populated Area

Assessment of Shallow Groundwater Purification Processes after the Construction of a Municipal Sewerage Network

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