A method for separating oil and mud from oily sludge

Abstract

The invention discloses a method for separating oil and mud from oily sludge. It includes the following steps: using a redox system to carry out mixed reaction with oily sludge, standing still, and then removing the water phase to separate oil, mud and water in the oily sludge; the redox system is a reducing agent aqueous solution and an oxidizing agent aqueous solution. The method of the invention can decompose HPAM and release oil droplets or solid substances wrapped in polymers, and obtain oil-cement three-phase substances after standing still. The invention can obtain a clear water phase with low oil content, and can simplify the subsequent steps of oily sludge treatment, so as to achieve the purpose of recovering crude oil.

Description

technical field [0001] The invention relates to a method for separating oil and mud from oily sludge, which belongs to the field of petrochemical industry. Background technique [0002] Oily sludge with high oil content, high viscosity, and difficult dehydration will be produced in the process of crude oil extraction, transportation, and sewage treatment. The accumulation of these oily sludges leads to pollution of the atmosphere, water resources, and cultivated land, and its rich oil content will cause a large waste of resources. Therefore, it is of great significance to separate the oily sludge and extract the oil from the oily sludge. [0003] At present, the main method of separating oily sludge is to use a certain concentration of a certain surfactant solution to mix and stir with oily sludge to achieve the purpose of oil and mud separation, but this method often leads to turbidity of the treatment liquid , mixed with a large amount of pollutants, resulting in a new p...

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Problems solved by technology

[0003] At present, the main method of separating oily sludge is to use a certain concentration of a certain surfactant solution to mix and stir with oily sludge to achieve the purpose of oil and mud separation, but this method often leads to turbidity of the treatment liquid , mixed with a large amount of pollutants, resulting in a new problem of difficulty in subsequent sewage treatment

Especially for sludge containing polymers, the surfactants used are easy to interact with polymers to form difficult-to-handle gel complexes, which are difficult to handle later

[0004] In the actual oil recovery process, the use of polymers increases the oil recovery efficiency of crude oil, but it also leads to polymer residues in oily sludge, resulting in polymer-containing oil sludge.

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