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Twin-Screw Extrusion Process to Produce Renewable Fiberboards

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Produced water treatment by advanced oxidation processes.

Silvia Jiménez¹, Mario Andreozzi², María M Micó³

¹Departament d' Enginyeria Química, Universitat Rovira i Virgili, Av Països Catalans 26, 43007 Tarragona, Spain; R&D Department, Acciona Agua S.A.U, Parc de Negocis Mas Blau II, Avda. de les Garrigues, 22, 08820 El Prat de Llobregat, Barcelona, Spain.

The Science of the Total Environment

|February 21, 2019

Summary

Ozonation with hydrogen peroxide (H2O2) effectively removed organic contaminants from produced water (PW), outperforming photocatalysis and Fenton processes. This advanced oxidation process (AOP) offers an efficient solution for PW treatment, minimizing energy consumption.

Keywords:

Acetic acid Ozonation Photo-Fenton Photocatalysis Sono-Fenton

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Area of Science:

Environmental Chemistry
Water Treatment Technologies
Advanced Oxidation Processes (AOPs)

Background:

Produced water (PW) from oil and gas operations contains challenging organic pollutants like BTEX, naphthalene, and carboxylic acids.
Effective PW treatment is crucial for environmental protection and water resource management.
Advanced Oxidation Processes (AOPs) are promising for degrading refractory organic compounds in complex matrices.

Purpose of the Study:

To evaluate and compare the efficacy of different AOPs (photocatalysis, Fenton, ozonation) for polishing synthetic produced water.
To identify the most efficient AOP for removing a broad spectrum of organic contaminants, including acetic acid.
To determine optimal operating conditions for the most effective AOP and assess its energy efficiency.

Main Methods:

Preparation of synthetic PW by spiking seawater with toluene, xylene, naphthalene, phenol, acetic acid, and malonic acid.
Application of photocatalysis, Fenton-based processes, and ozonation (with and without H2O2) for PW treatment.
Analysis of total organic carbon (TOC) removal and specific pollutant degradation under varying AOP conditions.

Main Results:

All AOPs removed BTEX and naphthalene, but efficiency varied significantly for total organic carbon (TOC) removal.
Photocatalysis showed limited effectiveness, achieving <20% TOC removal even under optimal conditions.
Ozonation combined with H2O2 demonstrated superior performance, removing all organic components, including 78% of acetic acid, achieving 74% TOC removal in 2 hours under optimal conditions (4 g/h O3, 1500 mg/L H2O2, pH 10).

Conclusions:

Ozonation with hydrogen peroxide is the most effective AOP for produced water polishing among the studied methods.
This AOP efficiently degrades a wide range of organic pollutants, including recalcitrant acetic acid.
The optimized ozonation process exhibits the lowest energy consumption per order of TOC destruction, making it a sustainable treatment option.