# A Fenton Oxidation-Based Integrated Strategy for the Treatment of Raw Gasoline Alkali Residue in Kashi

## TL;DR

This study explores using Fenton oxidation to treat toxic gasoline alkali residue wastewater, achieving high chemical oxygen demand removal.

## Contribution

A novel integrated strategy combining pretreatment and UV-Fenton oxidation is proposed for efficient treatment of high-concentration organic wastewater.

## Key findings

- Optimal Fenton conditions achieved 97.8% COD removal from gasoline alkali residue wastewater.
- Pretreatment combined with UV-Fenton oxidation was identified as the most effective strategy.
- The study elucidates the reaction mechanism of Fenton oxidation in treating alkali residue.

## Abstract

Gasoline alkali residue raw liquid, a kind of highly toxicity containing organic waste generated during petroleum refining, is characterized by its complex composition, high pollutant levels, and significant emission volume. The effective treatment of this wastewater remains a considerable challenge in environmental engineering. This study systematically investigates the degradation efficiency and mechanism of Fenton oxidation in reducing the chemical oxygen demand (COD) of raw gasoline alkali residue sourced from Kashi. The effects of H2O2 concentration and the H2O2/Fe2+ molar ratio on COD and TOC removal were examined. Results demonstrated that the COD and TOC removal efficiency exhibited an initial decrease followed by an increase with rising concentrations of Fe2+ and H2O2. Comparative assessment of different combined Fenton processes revealed distinct mechanistic differences among the composite oxidation systems. The integration of pretreatment with UV-Fenton oxidation was identified as the optimal strategy. Under optimal conditions (pH = 3.0, H2O2 concentration = 1.0 mol/L, H2O2/Fe2+ molar ratio = 5:0.10), the COD was reduced from 25,041 mg/L to 543 mg/L, achieving a COD removal rate of 97.8%. This study elucidates the reaction mechanism of the Fenton system in treating alkali residue and provides a theoretical foundation for the advanced treatment of high-concentration organic wastewater.