Authors :
Asher Brenner1,2,*, Hodaya Cohen1, Or Gradus1, Oshrat Koren1, Semion Shandalov1, Yaron Zinger2
1 Unit of Environmental Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
2 The Center for Water Sensitive Cities in Israel, KKL Eshtaol 99775, Israel
E-mail  :*Corresponding Author: brenner@bgu.ac.il, Hodaya Cohen: hodayaha@bgu.ac.il, Or Gradus:orgradu@bgu.ac.il, Oshrat Koren: oshvak@bgu.ac.il, Semion Shandalov: shandalo@bgu.ac.il, Yaron Zinger: yaron.zinger4@gmail.com
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Abstract
This paper presents a research study aimed at the development of a hybrid biofilter that can serve for two different applications. This is a unique approach due to the prolonged dry period in Israel covering 7-8 months of the year. The tactic suggested herein is to use the same system for stormwater harvesting/treatment during winter, and for bioremediation of nitrate-contaminated groundwater during summer. Crude cotton and Eucalyptus wood-chips served as alternative carbon sources for denitrification, and both proved to support efficient reduction of nitrate with minimal release of nitrite and organic matter. During the stage of stormwater treatment, two types of biofilter-columns (120 & 70 cm long) were tested, with a minimal saturation zone and no addition of organic carbon. Complete nitrification could be achieved, even under high instantaneous hydraulic loads for both column types. Vegetation on top of the biofilters contributed to improved removal of the nitrate formed, by plant assimilation.
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