عنوان مقاله [English]
In this research, the removal of organic pollutants from a gasfield produced water after oil removal has been investigated, so that its COD concentration from 9500 mg/L must be reduced to the irrigation water standard usage. At first, since the electrical conductivity of this produced water was so high (6300 µS/cm), the evaporation method was used to reduce it, which reduced the electrical conductivity and COD to1100 µS/cm and 750 mg/L, respectively. As the COD of the evaporated produced water was less than 1000 mg/L, the photoelectrocatalyst method was used to purify the product from the evaporation process. In the photoelectrocatalytic method, boron carbon nitrite nanomaterial semiconductor used as catalysts in a coil type microreactor with a surface-to-volume ratio of about 3000 m2/m3 which results in rapid oxidation of organic matters. After fabricating the microreactor, the effect of different parameters on COD removal was investigated. It was found that optimum condition corresponding to 80 % COD removal was achieved at pH = 3, potential difference 20 V and electrical conductivity of 2500 µS/cm which could decrease wastewater COD to about 150 mg/L that is suitable for agriculture usage.
Keywords: Produced Water, Photoelectrocatalysis, COD Removal, Coil Type Microreactor