Optimization of the O3/H2O2 process with response surface methodology for pretreatment of mother liquor of gas field wastewater

Haoran Feng, Min Liu, Wei Zeng, Ying Chen

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Front. Environ. Sci. Eng. ›› 2021, Vol. 15 ›› Issue (4) : 78. DOI: 10.1007/s11783-020-1371-5
RESEARCH ARTICLE
RESEARCH ARTICLE

Optimization of the O3/H2O2 process with response surface methodology for pretreatment of mother liquor of gas field wastewater

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Highlights

• Real ML-GFW with high salinity and high organics was degraded by O3/H2O2 process.

• Successful optimization of operation conditions was attained using RSM based on CCD.

• Single-factor experiments in advance ensured optimal experimental conditions.

• The satisfactory removal efficiency of TOC was achieved in spite of high salinity.

• The initial pH plays the most significant role in the degradation of ML-GFW.

Abstract

The present study reports the use of the O3/H2O2 process in the pretreatment of the mother liquor of gas field wastewater (ML-GFW), obtained from the multi-effect distillation treatment of the gas field wastewater. The range of optimal operation conditions was obtained by single-factor experiments. Response surface methodology (RSM) based on the central composite design (CCD) was used for the optimization procedure. A regression model with Total organic carbon (TOC) removal efficiency as the response value was established (R2 = 0.9865). The three key factors were arranged according to their significance as: pH>H2O2 dosage>ozone flow rate. The model predicted that the best operation conditions could be obtained at a pH of 10.9, an ozone flow rate of 0.8 L/min, and H2O2 dosage of 6.2 mL. The dosing ratio of ozone was calculated to be 9.84 mg O3/mg TOC. The maximum removal efficiency predicted was 75.9%, while the measured value was 72.3%. The relative deviation was found to be in an acceptable range. The ozone utilization and free radical quenching experiments showed that the addition of H2O2 promoted the decomposition of ozone to produce hydroxyl radicals (·OH). This also improved the ozone utilization efficiency. Gas chromatography-mass spectrometry (GC-MS) analysis showed that most of the organic matters in ML-GFW were degraded, while some residuals needed further treatment. This study provided the data and the necessary technical supports for further research on the treatment of ML-GFW.

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Keywords

High salinity / High organic matters / Gas field wastewater / O3/H2O2 / Response surface methodology

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Haoran Feng, Min Liu, Wei Zeng, Ying Chen. Optimization of the O3/H2O2 process with response surface methodology for pretreatment of mother liquor of gas field wastewater. Front. Environ. Sci. Eng., 2021, 15(4): 78 https://doi.org/10.1007/s11783-020-1371-5

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Acknowledgements

This study was supported by the National Science and Technology Major Project of the 13th Five-Year Plan “High-efficiency development of ultra-deep bio-herm gas reservoirs with bottom water” (No. 2016ZX05017-005).

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2020 Higher Education Press
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