Fate and removal of pesticides in wastewater treatment plants –case of Yeşilirmak basin

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2019

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Kocaman, Kumru

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The effluent of wastewater treatment plants (WWTP) had been shown to be a significant source of micropollutants in surface waters. In this study, the aim was to investigate the biological treatment of commonly found micropollutants in Yeşilırmak river basin, with special emphasis on the effects of operational conditions on their removal in conventional biological WWTPs. Based on the monitoring results of TÜBİTAK project (115Y013) “Management of Point and Diffuse Pollutant Sources in Yeşilırmak River Basin” carbendazim, imidacloprid and aclonifen pesticides were observed to exceed the relevant Environmental Quality Standards (EQSs) in one or more sampling campaign therefore these pesticides were selected to be studied. To study the influence of SRT and pesticide concentration on the overall treatment performance laboratory scale instantaneously fed Sequencing Batch Reactors(SBRs) with 5 different SRTs (3, 8, 10, 20 and 30 days) were operated and the effects of having the pesticides in the influent on the COD removal performance of the reactors were sought. Also, the removals of these pesticides, either individual or in mixture, were studied under different SRTs and influent pesticide concentrations (0-400g/L). COD utilization capacity of the reactors operated with a single pesticide were not disrupted remarkably until introduction of 50 g/L pesticide. However, COD utilization capacity of the reactors operated with mixture of pesticides were disrupted beyond the addition of 25 g/L of each pesticide. There exists no clear correlation between the elimination of pesticides and SRT.Removal efficiencies of aclonifen and carbendazim pesticides were better when the pesticides were spiked as mixture.

Subject Keywords

Pollutants., Micropollutants., Water, Sewage disposal plants., Water

URI

http://etd.lib.metu.edu.tr/upload/12623100/index.pdf
https://hdl.handle.net/11511/28000

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

K. Kocaman, “Fate and removal of pesticides in wastewater treatment plants –case of Yeşilirmak basin,” M.S. - Master of Science, Middle East Technical University, 2019.