Assessment of Greywater Treatment Efficiency Using of Surface Adsorption with Iron oxide nanoparticles

Subject Areas : watere sciences

سعید گواهی ^{1 *} , ehsan derikvand ^{2 *} , صایب خوشنواز ³ , Mohsen Solimani Babarsad ⁴ , Iman Parseh ⁵

1 - Department of Water Sciences, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran.
2 - Department of Water Science, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran
3 -
4 - عضو هیات علمی گروه آبیاری دانشگاه آزاد اسلامی واحد شوشتر
5 - Behbahan Faculty of Medical Sciences, Behbahan, Iran

Received: 2024-09-30 Accepted : 2025-04-19 Published : 2025-03-10

Keywords: gray water, H2O2, UV, treatment, oxidation, SBR,

Abstract :

 

Gray water, a valuable recycling resource, is often contaminated with non-degradable organic compounds, requiring advanced treatment. This study investigated the use of Fe3O4 iron oxide nanoparticles for surface adsorption of gray water from a Sequencing Batch Reactor (SBR) followed by UV/H2O2 chemical oxidation.The results showed that a dosage of 1.2 g/L iron nanoparticles was optimal for pollutant removal. Under optimized conditions, removal efficiencies for COD, BOD, TKN, and TP were 57%, 36%, 7.5%, and 60%, respectively. pH variations had minimal impact on BOD, phosphate, and nitrate removal, while COD removal was more effective at lower pH.The Freundlich isotherm better described the adsorption process for phosphate, nitrate, BOD, and COD compared to the Langmuir model. Combining surface adsorption with Fe3O4 and UV/H2O2 chemical oxidation achieved a COD removal efficiency exceeding 90%. This study demonstrates that surface adsorption alone may not meet wastewater discharge standards, but when combined with chemical oxidation, it can effectively treat gray water.

 

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