Treatment method for destabilization three-phase separation of emulsified water-in-oil type oily wastewater

Abstract

The invention discloses a treatment method for destabilization three-phase separation of emulsified water-in-oil type oily wastewater. The treatment method comprises the following steps: (1) carryingout a destabilization treatment on the emulsified water-in-oil type oily wastewater by adopting a salting-out process; (2) carrying out oil-phase, water-phase and solid-phase separation on the destabilized oily wastewater to obtain an oil phase and a solid slag phase, which are qualified and reach the standard; (3) removing pollution ions in the water phase; (4) carrying out solid-liquid separation on the produced water from which the pollution ions are removed; (5) carrying out medium filtration on the produced water subjected to solid-liquid separation to remove pollutants; and (6) carryingout a DTRO reverse osmosis treatment on the produced water to obtain qualified clear water reaching the standard. The water content of the recycled oil phase obtained after treatment is smaller than 2%; the oil content of the solid slag phase is less than 5%; the water phase meets the primary standard requirement in Integrated Wastewater Discharge Standard, pollutant reduction, recycling and environment-friendly harmless treatment of the oily wastewater are fully realized, and the method is very suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a treatment method for destabilizing three-phase separation of emulsified water-in-oil type oily wastewater. Background technique [0002] The existing oily wastewater treatment methods mainly include biological method, incineration method, extraction method, conditioning and centrifugation method, etc. [0003] The biological method uses microorganisms to reduce petroleum hydrocarbons to achieve harmless treatment. The biological method is usually suitable for the treatment of oily wastewater with low oil content, and a large amount of oily wastewater from oil and gas fields belongs to high oily wastewater with an oil content of more than 10% to 20%. [0004] The incineration method makes the resources in the disposal not well utilized, and produces a large amount of toxic and harmful polluting gases and dust. [0005] The extraction method will use large chemical ...

AI Technical Summary

Problems solved by technology

[0004] The incineration method makes the resources in the disposal not well utilized, and will produce a large amount of toxic and harmful polluting gases and dust

[0005] The extraction method will use large chemical reagents, which will easily cause problems such as leakage, safety, and secondary pollution.

[0006] The key to the conditioning and centrifugation method is conditioning, and conditioning has always been a technical difficulty that needs to be solved in the industry. The existing process technology needs to be further improved and optimized. The reason is that the oily wastewater has sufficient emulsification, is quite stable, and is extremely difficult to destabilize. , which makes it difficult to realize oil, water and slag three-phase separation and further phase separation for resource utilization and environmental protection disposal, and the treatment process is often incomplete, and re-injection is often caused by simple treatment or ineffective and complete treatment, resulting in re-injection Uncertainty in the formation and groundwater has a potential pollution risk

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