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An efficient and cost-effective treatment process must strike a balance between treatment efficiency and operating costs. The consumption of the chemical reagents in the treatment technology of photo/Fenton and classic Fenton alone are shown in Table 2. The cost of the treatment of the classic Fenton process alone was about RMB10.58/m3, while in the case of the photo/Fenton process, the cost was only RMB9.43/m3 when met with the same COD discharge requirement. From the perspective of economy, the photocatalytic process reduced the cost of H2O2 in the subsequent Fenton process, thereby resulting in lower treatment cost. This indicated that the photo/Fenton process was more economical for the degradation of oilfield wastewater. Thus the photo/Fenton process can be potentially used in industrial applications.

Table 2

Consumption of the reagents and their costs

 Dosage (kg/m3)
 
Treatment technologyHClNaOHFeSO4·7H2OH2O2UV (W)Operating cost (RMB/m3)
Fenton process 0.015 0.05 10 10.58 
Photo/Fenton process 0.015 0.05 1.793 7.986 300 9.43 
 Dosage (kg/m3)
 
Treatment technologyHClNaOHFeSO4·7H2OH2O2UV (W)Operating cost (RMB/m3)
Fenton process 0.015 0.05 10 10.58 
Photo/Fenton process 0.015 0.05 1.793 7.986 300 9.43 

Note: Unit price of reagent (RMB/t): HCl, 100; NaOH, 2,000; FeSO4·7H2O (99.0 wt.% purity), 240; H2O2 (30%, w/w), 1,000; UV lamp (300 W), 0.5 RMB (KW/h).

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