Heavy oil sludge treatment method

Abstract

The invention discloses a heavy oil sludge treatment method, which belongs to the field of heavy oil sludge harmless and resourceful treatment, and comprises chemical separation, air floatation oil removal and phytoremediation, and specifically comprises the following steps of heating a mixed solution obtained by diluting heavy oil sludge with water, adding sulfuric acid to adjust the pH value, adding a self-made demulsifier and a commercial coagulant, and carrying out chemical separation while stirring. After separation is completed, standing and layering are conducted, floating oil on the uppermost layer enters an oil storage tank, lower-layer water and sediment are separated through a centrifugal machine, centrifugate further enters air floatation oil removal, and mud cakes enter phytoremediation. And the oil content of the mud cake after phytoremediation is lower than 0.5%. According to the method, the heavy oil sludge is treated by combining a chemical method, a physical method and a biological method, and recycling and harmlessness of the heavy oil sludge are achieved.

Description

technical field [0001] The invention relates to the technical field of harmless and resourceful treatment of heavy oil sludge, in particular to a method for treating heavy oil sludge. Background technique [0002] Heavy oil sludge is a typical oily sludge, which is mainly produced in the process of heavy oil mining, transportation, storage, and heavy oil wastewater treatment; it contains wax, asphaltene, colloid, and scale inhibitors, coagulants, and fungicides, etc. The chemical agent is a stable system of oil-in-water and water-in-oil type. If oily sludge is piled up randomly or improperly disposed of without treatment, it will seriously endanger the environment and human health, and it has been included in the hazardous waste management system. Harmful substances in oily sludge, especially high-concentration petroleum hydrocarbons will poison soil microorganisms, reduce the types and quantities of soil microorganisms, further reduce the activity of soil invertases, and r...

AI Technical Summary

Problems solved by technology

[0003] The oil content of heavy oil sludge is generally higher than 20%, up to 50%, and the recovery value is high; but its composition is complex, the viscosity is large, the particles are fine, the degree of emulsification is high, and dehydration is difficult

Solvent extraction can recover most of the petroleum substances. Because the extraction agent is expensive and there is a certain loss during the treatment process, the treatment cost is high; incineration usually requires the consumption of combustion aids, which is costly and has the risk of secondary pollution of flue gas

Thermal desorption can effectively recover oil and gas, but it requires high equipment and high investment and operation costs; solid-liquid separation can recover most of the oil in sludge, and the process is relatively easy to implement. The main research direction is to develop efficient and low-cost demulsifiers

[0004] In recent years, with the strengthening of environmental protection in oil fields, the treatment methods of heavy oil sludge have been well developed, but each has its own strengths and certain limitations. It is difficult to achieve a single process alone. Harmless, Recycling and Reduction of Heavy Oil Sludge