Oily sewage is one of the wastes produced in the oil industry production process and its quantity has been increasing year by year, which influences the environment and human health severely. Electric flocculation method is one of the wide application electrochemical treatment technologies for the oily wastewater treatment at home and abroad, which has higher efficiency than other technologies at the aspect of the organic pollutants degradation. A simulative experiment device dealing with heavy oil sewage by the electric flocculation method has been designed. The mechanism of the electric flocculation method in removing organic matter of the heavy oil sewage by analyzing the change of the composition and content of the organic matter in water samples before and after the process of the electric flocculation has been studied. Research results show the carbon/tin dioxide electrode is better than the carbon/ruthenium dioxide electrode in removing organic matter; most alkanes matter in the oily wastewater have been removed in the dispersing oil form by the electric flocculation; as the current density increases, the types and quantity of the response organic matter can be improved while types of the new synthetic organics increase. At the same time, the authors provide a theory support in specific optimization of the electricity flocculation flotation in oily wastewater treatment technology and process.
Environmental sensitivity areas need more investment to treat and process environmental pollution from waste drilling fluids than non-sensitivity areas because the former was closer to rivers, villages, farmlands, etc., which not only increased the burden of enterprises, but also constrained the sustainable development for oilfields. In order to overcome the challenge of treating waste drilling fluids in environmental sensitivity areas, harmless treatment technology and formulas for waste drilling fluids were developed and determined in this study. The basic formula was: 10.0% SD-4 + 2.5% SD-5 + 9.0% SD-6 + 7.0% SD-7. This technology broke through the traditional curing processing technology and it was successfully applied to two oil wells in Wenmi environmental sensitivity areas. The results showed that the main pollutants were below the requirements of related state environmental protection standard limits and had some porosity and soil-like characteristics. Therefore, the aim of harmless treatment and restoring drilling of waste drilling fluids was realized and the ecological environment of environmental sensitivity areas was well protected.
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