The effect of redox conditions and adaptation time on organic micropollutant removal during river bank filtration: A laboratory-scale column study
| Autor: | J.P. van der Hoek, C. Bertelkamp, J. Vanden Bussche, Naresh Singhal, A.R.D. Verliefde, Klaas Schoutteten, Lynn Vanhaecke |
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| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology Simazine 02 engineering and technology 010501 environmental sciences 01 natural sciences Redox law.invention chemistry.chemical_compound Nitrate Rivers law Environmental Chemistry Atrazine Waste Management and Disposal Filtration 0105 earth and related environmental sciences Biodegradation Pollution Anoxic waters 020801 environmental engineering Biodegradation Environmental chemistry Models Chemical Environmental chemistry Degradation (geology) Oxidation-Reduction Water Pollutants Chemical |
| Zdroj: | The Science of the total environment. 544 |
| ISSN: | 1879-1026 |
| Popis: | This study investigated the redox dependent removal and adaptive behaviour of a mixture of 15 organic micropollutants (OMPs) in laboratory-scale soil columns fed with river water. Three separate pilot systems were used consisting of: (1) two columns, (2) ten columns and (3) twenty two columns to create oxic, suboxic (partial nitrate removal) and anoxic (complete nitrate removal). The pilot set-up has some unique features--it can simulate fairly long residence times (e.g., 45 days using the 22 column system) and reduced conditions developed naturally within the system. Dimethoate, diuron, and metoprolol showed redox dependent removal behaviour with higher biodegradation rates in the oxic zone compared to the suboxic/anoxic zone. The redox dependent behaviour of these three OMPs could not be explained based on their physico-chemical properties (hydrophobicity, charge and molecular weight) or functional groups present in the molecular structure. OMPs that showed persistent behaviour in the oxic zone (atrazine, carbamazepine, hydrochlorothiazide and simazine) were also not removed under more reduced conditions. Adaptive behaviour was observed for five OMPs: dimethoate, chloridazon, lincomycin, sulfamethoxazole and phenazone. However, the adaptive behaviour could not be explained by the physico-chemical properties (hydrophobicity, charge and molecular weight) investigated in this study and only rough trends were observed with specific functional groups (e.g. ethers, sulphur, primary and secondary amines). Finally, the adaptive behaviour of OMPs was found to be an important factor that should be incorporated in predictive models for OMP removal during river bank filtration. |
| Databáze: | OpenAIRE |
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