A RISK-BASED MONITORING AND CONTROL STRATEGY FOR MICROPOLLUTANTS IN A RIVER BASIN

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2022-8-15

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Pilevneli, Tolga

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There is a need to develop a methodology for cost-effectively assessing and monitoring the quality of surface waters, and controlling micropollutant discharges from point sources in a river basin. This study aims to develop a monitoring and control strategy by prioritizing micropollutants according to their potential hazard and exposure levels in the Yeşilırmak River Basin (YRB). The temporal and spatial variation in the occurrence of 295 micropollutants was assessed by adopting a statistical screening approach, and 25 micropollutants that were identified as cause of concern (CoC) micropollutants in the YRB were recommended as tracers of water quality monitoring. Based on the temporal variation, spring was suggested as the preferred micropollutant monitoring season. For the first time in the YRB, the applicability of adopting a fixed dilution factor (DF) strategy to control micropollutants in point source effluents was evaluated by calculating the DF for each point source. The results indicated that the fixed DF strategy fails to comply with reaching the target water-quality standards. Ecotoxicological risk assessment methodology developed by combining surface water and point source risk assessment methodologies was used to assess the risk level in each sub-basin. The results of the bivariate correlation analysis carried out indicated that the river water concentrations of 17 CoC micropollutants are correlated to basin characteristics. This information was evaluated together with the results of the DF and ecotoxicological risk assessments to propose a point source management strategy in the YRB. Incorporation of the proposed monitoring and control strategy will ensure that water quality monitoring is cost-effective and water-quality goals are achieved.

Subject Keywords

Micropollutants, River Basin Management, Dilution Factor, Risk Assessment, Monitoring Strategy

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https://hdl.handle.net/11511/99523

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

T. Pilevneli, “A RISK-BASED MONITORING AND CONTROL STRATEGY FOR MICROPOLLUTANTS IN A RIVER BASIN,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.