Document Type : Research Paper
Authors
1
Department of Water Sciences, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran.
2
Department of Water Sciences, Water Science and Environmental Research Center, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran.
3
Department of Environmental Health Engineering, Behbahan faculty of medical sciences, Behbahan,Iran
Abstract
In the surrounding environment and human societies, there are many sources for recycling, one of the important and basic sources is gray water, which currently enters the sewer and increases the volume of wastewater treatment. Gray water sometimes needs to be treated using advanced non-biological methods due to non-degradable organic compounds. In this article, contaminated water from Sequencing Batch Reactor (SBR) as biological process and UV/ H2O2 as chemical oxidation is placed in the vicinity of Fe3O4 iron oxide nanoparticles for surface adsorption. Chemical oxygen demand (COD), biological oxygen demand (BOD), NO3 and PO4 of the studied wastewater are 170, 40, 3.9 and 0.4 respectively. The results showed that in order to remove the maximum pollutants, 1.2 g/l of iron nanoparticles should be consumed. The removal efficiency of COD, BOD, NO3 and PO4 at pH=4 and contact time of 40 minutes was 57, 36, 7.5 and 60%, respectively. Based on the results shown, COD removal rate using iron oxide nanoparticle adsorbent follows both Langmire and Freundlich isotherms with R2 greater than 0.90. But the removal of phosphate, nitrate and BOD5 shows the best correlation with the Freundlich isotherm with R2 equal to 0.99, 0.99 and 0.97, respectively. using UV/ H2O2 chemical oxidation after surface adsorption with Fe3O4, COD removal efficiency, above of 90% was observed. This article showed that surface adsorption alone cannot provide the standards of wastewater discharge, but if it is combined with chemical oxidation, this will be possible.
Keywords
Main Subjects
)