Impacts of Zeolite Activation Temperature and Grain Size toward Bioretention System Efficiency in Removing Pb and Zn Pollutant in Stormwater Runoff Elgin Martama (*a), Nyoman Suwartha (a)
a) Department of Civil Engineering, University of Indonesia, Depok City, 16424, Indonesia
*im.elginmartama[at]gmail.com
Abstract
Stormwater runoff can be utilized as a clean water supply through a simple treatment technology such as a bioretention system. However, this water treatment efficiency is influenced by various factors. Previous research showed that although the bioretention system had combined with a plant and media composition, the concentration of effluent still exceeds the quality standard. The purpose of this research was to improve the bioretention efficiency in removing heavy metal Pb and Zn in stormwater runoff. Three variations of bioretention were prepared, with the same combination of 2 type plants (Chrysopogon zizanioides and Iris pseudacorus) and media composition (zeolite: quartz: compost: soil = 6:2:1:1). The zeolite activation temperatures and grain sizes were simulated with 3 discharges variation of initial Pb and Zn concentration of synthetic stormwater runoff. The results showed that modified bioretention produced higher removal efficiency of Pb (99.95% on average) and Zn (98.89% on average). Besides, the effluent concentrations have met the water quality standard following Government regulation No. 82/2001. In conclusion, the higher temperature of activated zeolite combined with smaller grain size significantly enhance the removal efficiency of Pb and Zn in stormwater runoff.
Keywords: Bioretention system- Pb and Zn removal efficiency- Water quality- Zeolite activation temperature- Zeolite grain size.
Topic: Environmental Science, Technology, and Education
