Comparison of Fenton, ultraviolet–Fenton and ultrasonic–Fenton processes on organics and colour removal from pre-treated natural gas produced water

  • J. ZhaiEmail author
  • H. Ma
  • J. Liao
  • M. H. Rahaman
  • Z. Yang
  • Z. Chen
Original Paper


Produced water (PW) from natural gas field, characterized with high organic contents, has brought high environmental concerns world widely. Fenton and enhanced Fenton technologies were considered as the potential methods to degrade the organic contaminates in the PW, but with very limited data or reference. Here, we examined the optimum conditions of Fenton on organics and colour removal from natural gas PW after coagulation pre-treatment. Simultaneously, the optimal Fenton process integrated with ultraviolet (UV) and ultrasonic (US) irradiation were applied to enhance pollutants removal efficiencies. The optimal Fenton conditions were found at 60 min with molar ratios of 6:1 and 25:1 for H2O2/COD and H2O2/Fe2+, respectively and the initial pH of 3. Among these the three treatment processes, chemical oxygen demand (COD), total organic carbon, 5-day biological oxygen demand (BOD5), and colour removal efficiencies were highest during UV–Fenton (82, 73, 68, and 95%,) followed by US–Fenton (79, 70, 66, and 95%) and Fenton treatment (70, 58, 51, and 92%), respectively. High biodegradability (BOD5/COD) was also observed after UV–Fenton process (0.76) than the others (both 0.73). The current study showed a satisfactory carbon and colour removal efficiencies from PW using different Fenton processes; however, there still is a need for final polishing such as biological treatment or low cost constructed wetland before discharge. This study can be a good reference for engineering application PW treatment.


Produced water (PW) Fenton process UV–Fenton US–Fenton 



Funding for this study was provided by the National Natural Science Foundation of China under Grant No. 51478062, 51208533, the Basic and Advanced Technology Research Program of Chongqing under Grant No. cstc2015jcyjBX0111 and by the Fundamental Research Funds for the Central Universities under Grant No. 106112016CDJZR218805.


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Copyright information

© Islamic Azad University (IAU) 2017

Authors and Affiliations

  1. 1.Chinese Education Ministry Key Laboratory of the Three Gorges Reservoir Region’s Eco-EnvironmentChongqing UniversityChongqingPeople’s Republic of China

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