Research on Electrochemical Technique Appling to Oilfield Produced Water Treatment
|School||Tianjin University of Technology|
|Keywords||electrode electrochemistry wastewater treatment oilfield wastewater|
With the oil extraction, many oilfields have entered the mid or late mining, more and more oilfield wastewater emits in the process of oilfield development and production. Without Governance, it will not only impact the ecological environment, but also decrease the level of oilfield development, so that oilfield can’t operate normally. Oilfield wastewater treatment and re-injection is the right way to develop the oilfield and make good use of the water resource. For environmental protection and conserving resource considerations, how to economically and effectively deal with oilfield wastewater is the key to sustainable development of oilfield and research focus.At present, domestic and international oilfields are looking for effective wastewater treatment technologies. Compared to other wastewater treatment technologies, electrochemical technology doesn’t need to add the additive, so that it avoids secondary pollution problems; by controlling the potential, electrode reaction can be highly selective, and has good treatment effect, so it attracts people’s attention.In this study, we prepared Ti/RuO2 electrode by thermal decomposition and deposited boron-doped diamond（BDD） thin film electrode by hot-filament chemical vapor deposition （HFCVD） on tantalum substrate. Comprehensively consider the requirements of electrochemical wastewater treatment to the electrode performance, analysing the current common types of electrodes, and compared Ti/RuO2 electrode with boron-doped diamond thin film electrode by experiment and ultimately select Ti/RuO2 electrode for the electrochemical experiment anode.In this thesis, taking oilfield produced water as the research object, using electrochemical oxidation method to treat oil wastewater to study the electrolysis time, current density and electrode distance on the impact of iron removal; and optimized operating parameters to improve the treatment efficiency. The experiment results show that the electrochemical oxidation of iron has good oxidation ability and treatment effect.Using the electrolysis technology to treat the oilfield produced water and study the effectiveness of oil removal. Even if without dosing pharmacy, the electrochemical technology also has certain effect of oil removal; at the same time, we can extract oil by treating the oilfield wastewater. It is not only good to environment, but also has enormous social and economic benefits.Using electrochemical oxidation technology to treat oilfield produced water, research COD removal. Experimental results show that this method has strong capacity of oxidative degradation, in the reaction process eletrode isn’t dissolved in the water and without secondary pollution. The effect of COD removal is clear.Using Ti/RuO2 anode to treat oilfield produced water by electrolysis technology to sterilize bacteria, through the residual chlorine test found that this method doesn’t only have reliable sterilization effect, but also has continuous sterilization action.