Resource treatment method of oil-containing sludge

Abstract

The invention relates to a resource treatment method of oil-containing sludge, and especially discloses a composite extracting agent for treating the oil-containing sludge produced in a wastewater treating process of an oil refinery. Oil-containing sludge having higher water content after centrifugal dehydration is mixed with the composite extracting agent under a condition of higher temperature to destroy a water, oil and solid stabilizing system of the oil-containing sludge, extraction treatment is carried out, the extracted mixture is subjected to solid-liquid separation, the separated solid phase is dried, the formed solid residue is mixed with coal and can be used as fuel of a coal-fired boiler, the separated-out oil and the extracting agent directly go into a crude oil processing system for recycling, and wastewater generated in the process can reach standards after biochemical treatment and is discharged. The treatment method is mainly characterized by having high extracting efficiency, short device procedures, and low equipment investment.

Description

technical field [0001] The invention relates to an extraction treatment method of oily sludge, in particular to a harmless and resourceful treatment process for oily sludge produced by oil refineries and oil refinery sewage treatment plants. Background technique [0002] Refining and chemical enterprises produce a large amount of oily sludge in the process of petroleum refining and wastewater treatment, which mainly come from grease traps, flotation tanks, biologically activated sludge, crude oil dehydration tanks, oil storage tanks and waste oil tanks. These sludges are complex in composition and belong to a relatively stable multi-phase system. They are generally composed of oil-in-water, water-in-oil and suspended solids. They are fully emulsified and have a high viscosity. The solid phase is difficult to settle completely, and the treatment is difficult. At present, in my country's petrochemical industry, an average of 800,000 tons of oily sludge is produced every year. ...

AI Technical Summary

Problems solved by technology

The harmless resource utilization of waste solids has been listed as an important work content for building a conservation-minded society. According to new regulations and standards, many enterprises are difficult to meet the requirements for the disposal of oily sludge, resulting in increased pollution burden for enterprises and environmental pollution. Prominent hidden danger

[0003] In the past 20 years, although there have been a variety of research reports on oily sludge, and the treatment technologies for oily sludge are also varied, each method has its own advantages and disadvantages and the scope of application. Nowadays, the treatment technology of oily sludge is difficult Be popularized and applied to form industrialized production

At present, the problem of oily sludge treatment has been difficult to solve economically and rationally, and it is often treated by open-air stacking or landfill. These sludges generally contain hydrocarbons, benzene series, phenols, and anthracene, accompanied by stench and Toxicity, if it comes into direct contact with the natural environment, it will cause serious pollution to soil, water and vegetation, and also cause a waste of petroleum resources

This technology uses only one extractant in the extraction process, which has great limitations in compatibility with petroleum substances with complex structures in oily sludge, and the extraction effect is limited.

[0005] CN1O1823824B, CN200910079177.4 proposed that in the oily sludge treatment process, the extractant is C 4 ~C 20 One of the medium hydrocarbons, the compatibility with petroleum substances with complex structures in oily sludge has great limitations, and the extraction effect is limited

[0006] CN1526797A proposes a method for extracting oily sludge. The extraction agent is light coal tar (boiling point 45°C-90°C under normal pressure), petroleum ether, light oil or C 5 , only one extraction agent is used, and the oil extraction is not easy to complete after the oily sludge is extracted

This method has long process flow, complex equipment, harsh operating conditions and high energy consumption.

In addition, some patent documents also involve the treatment of oily sludge, but the oily sludge treatment technologies involved in these patent documents have high energy consumption, complicated process flow, harsh operating conditions, or insufficient treatment of oily sludge. inadequacies of

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