Experimental Study on Oilfield Wastewater Pretreatment Using Iron-Carbon Microelectrolysis

This paper studied the pretreatment method for oil wastewater using iron-carbon microelectrolysis technology and its influence factors. Following experimental procedure was designed:firstly,the pH of oilfield wastewater was adjusted to acidic,then some activated iron and saturated adsorption carbon were added,taking an aeration reaction for some time,after removing the iron and carbon,the pH was adjusted again to alkaline,after stirring and stewing 40 min,the liquid supernatant was detected and analyzed. The effect factors of iron-carbon microelectrolysis pretreatment on COD removal efficiency,pH value,reaction time,mass ration of iron-carbon and iron dosage were determined by orthogonal experiment and single factor experiment. Results show that theeffect factors are in order of pH Fe /H2 O reaction time Fe /C; Under the optimal condition,namely pH is 4. 0,iron dosage is 0. 167 g·mL- 1,reaction time is 30 min. and mass ration of ironcarbon is 3. 0,the COD removal efficiency is 54. 3%. It indicates that the pretreatment method for oil wastewater using iron-carbon microelectrolysis technology has good efficiency,in which the pH value and dosage of iron have obvious influence on removing of COD.