Heavy oil sludge treatment method

A treatment method and technology for oily sludge, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of high equipment requirements, loss, and high treatment costs, and achieve increased collision frequency, Effects of reduced toxic effects and low disposal costs

Inactive Publication Date: 2021-03-12
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Heavy oil sludge was collected from an oil production company in Northeast China. The water content, oil content and sediment content of heavy oil sludge were 8.23%, 41.32% and 50.45%, respectively. Take by weighing 50g thick oily sludge in 250ml beaker, add 200ml water to dilute, add sulfuric acid to adjust pH to be 5, add greasy sludge mass fraction 0.7% self-made demulsifier (Al 2 o 3 Mass fraction is 20%), 0.5% polyacrylamide. Slowly stir and separate under the condition of stirring and raising the temperature to 80° C. for 25 minutes. After the separation is completed, the floating oil enters the oil storage tank, the water and sediment in the lower layer are separated by a centrifuge, the centrifuge further enters the air flotation to remove oil, and the mud cake enters the phytoremediation. The oil content of the mud cake is 1.7%.

[0029] (2) Air flotation and degreasing: the chemically separated centrifugate is subjected to air flotation and degreasing af...

Embodiment 2

[0032] (1) Heavy oil sludge was collected from an oil production company in Northeast China. The water content, oil content and sediment content of heavy oil sludge were 8.67%, 39.65% and 51.68%, respectively. Take by weighing 50g thick oily sludge in 250ml beaker, add 200ml water to dilute, add sulfuric acid to adjust pH to be 6, add greasy sludge mass fraction 0.6% self-made demulsifier (Al 2 o 3 Mass fraction is 25%), 0.7% polyacrylamide. Slowly stir and separate under the condition of stirring and raising the temperature to 75° C. for 30 minutes. After the separation is completed, the slick oil enters the oil storage tank, the water and sediment in the lower layer are separated by a centrifuge, the centrifuge further enters the air flotation to remove oil, and the mud cake enters phytoremediation. The oil content of the mud cake is 1.8%.

[0033] (2) Air flotation and degreasing: after the chemically separated centrifugal liquid passes through the heat exchange system to...

Embodiment 3

[0036](1) Heavy oil sludge was collected from an oil production company in Northeast China. The water content, oil content and sediment content of heavy oil sludge were 8.35%, 42.21% and 49.44%, respectively. Take by weighing 50g thick oily sludge in 250ml beaker, add 200ml water to dilute, add sulfuric acid to adjust pH to be 5, add greasy sludge mass fraction 0.7% self-made demulsifier (Al 2 o 3 Mass fraction is 22%), 0.5% polyacrylamide. Slowly stir and separate under the condition of stirring and raising the temperature to 80° C. for 25 minutes. After the separation is completed, the floating oil enters the oil storage tank, the water and sediment in the lower layer are separated by a centrifuge, the centrifuge further enters the air flotation to remove oil, and the mud cake enters the phytoremediation. The oil content of the mud cake is 1.7%.

[0037] (2) Air flotation and degreasing: the chemically separated centrifugate is subjected to air flotation and degreasing aft...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/147C02F11/02
CPCC02F11/02C02F11/143C02F11/147
Inventor 滕青张冬梅邓辅财张建磊马寅彭雅琳吕欣如李嘉杰杨春平
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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