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Composite experimental research on fracturing liquid of preoxidation-coagu-flocculation-ozone deeply oxidation process

TL;DR: In this paper, water-based fracturing fluid from a petrochemical company effluent treatment plant, on the basis of the analysis on the water characteristics,putting forward preoxidation-coagu-flocculation-ozone deeply oxidation composite process.
Abstract: Fracturing liquid contains lots of organic additive,complicated composition,high COD,difficult to handle.This experiment research object is water-based fracturing fluid from a petrochemical company effluent treatment plant,on the basis of the analysis on the water characteristics,putting forward preoxidation-coagu-flocculation-ozone deeply oxidation composite process.The results show that after preoxidation-coagu-flocculation treatment,the CODOH-KI removal is 82.3%,then using ozone for deeper oxidation,CODOH-KI removal is 86.5%,fracturing Liquid has a good treatment effect.
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Journal ArticleDOI
TL;DR: Results show that COD was reduced to 92 mg/L, and the overall water quality of the final effluent could meet the class I national wastewater discharge standard of petrochemical industry of China.
Abstract: In this study, a combined process was developed that included flocculation, Fenton oxidation and sequencing batch reactor (SBR) to treat oilfield fracturing wastewater (FW). Flocculation and Fenton oxidation were applied to reduce chemical oxygen demand (COD) organic load and to enhance biodegradability, respectively. For flocculation, the optimum conditions were: polymeric aluminium chloride dosage, 40 mg/L; polyacrylamide dosage, 4 mg/L; dilution ratio, 1:2 and stirring time, 30 min. For Fenton oxidation, a total reaction time of 60 min, a H2O2 dosage of 2 m mol/L, with a [H2O2]/[FeSO4] ratio of 2 were selected to achieve optimum oxidation. Under these optimum flocculation and Fenton oxidation conditions, the COD removal efficiency was found to be 76.6%. Following pretreatment with flocculation and Fenton oxidation, the FW was further remediated using a SBR. Results show that COD was reduced to 92 mg/L, and the overall water quality of the final effluent could meet the class I national wastewater discha...

25 citations


Cites background from "Composite experimental research on ..."

  • ...com alone or their integration.[3] Nevertheless, the treatment effect is not ideal, which causes limitation for field application....

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Journal ArticleDOI
TL;DR: Experiments proved the effect of combined process is marvelous and the overall water quality of the final effluent could meet the class III national wastewater discharge standard of petrochemical industry of China (GB8978-1996).

14 citations

Journal ArticleDOI
TL;DR: The UV_vis spectra analysis results indicated that the coagulation and UV/H2O2/ferrioxalate complexes process could efficiently remove the hydroxypropyl guar gum dissolved in OFW.

9 citations

Journal ArticleDOI
TL;DR: Experimental results show that the coagulation and UV/H2O2/ferrioxalate complexes process could efficiently remove the organic material dissolved in OFW and met the GB8978-1996' Integrated Wastewater Discharge Standard' level III emission standard.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed an electrocoagulation (EC) method that is time saving, highly efficient, and easy to apply to deal with the problem of hydraulic fracturing.
Abstract: Fracturing flowback fluid is the most important contaminant associated with oil and gas explo - ration and production, which requires low-cost and sustainable technologies for treatment. This study proposed an electrocoagulation (EC) method that is time saving, highly efficient, and easy to apply to deal with this problem. A Box–Behnken design coupled with the response surface methodology (RSM) was used to construct a model of the EC process to intensively control hydro - gen (H 2 ) production and to reduce potential safety risks while achieving high treatment efficiency. The model describes the change in the responses of decolorization rate and H 2 production in accordance with electrolysis current, plate spacing, electrolysis time, and S / V . Results show that the turbidity removal rate, decolorization rate, and H 2 production are predicted to be 87.03%, 89.14%, and 138.12 mL under the maximum H 2 production process. On the contrary, the turbidity removal rate, decolorization rate, and H 2 production are predicted to be 91.23%, 95.7%, and 7.86 mL, respec - tively, under minimum H 2 production conditions obtained through the model. The relative error between all the predicted and measured values is less than 2.5%. Overall, the RSM is feasible to optimize and predict the process conditions, treatment effect, and H 2 production of EC-treated fracturing flowback fluid. This optimization and prediction study can provide a reference for the efficient and safe application of EC to improve the treatment effect and control the H 2 production in the wastewater treatment process.