Treatment method for oily sludge of oil refinery

A sludge and purpose technology, applied in the field of oily sludge treatment, can solve the problems of restricting the progress of oily sludge treatment process, complex equipment and operation process, unsatisfactory treatment effect, etc., achieve significant economic and social benefits, improve efficiency, The effect of preventing secondary pollution

Inactive Publication Date: 2014-11-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, several processes are relatively mature and have been used in actual production, but these processes have more or less disadvantages: unsatisfactory treatment effect, high cost, complicated equipm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add water to the oily sludge with a moisture content of 80%-90% to adjust the moisture content to about 95%, and filter it with a 100-mesh stainless steel filter.

[0025] (2) Adjust the pH to about 7 and the temperature at 50-60°C, and add a biological demulsifier to the filtered sludge. The demulsifier is a total fermentation culture of Bacillus subtilis in the decline stage with a mass fraction of 5%-10% solution, the dosage is 20mg / L, stir to make it homogenized.

[0026] (3) While stirring in step 2), treat the sludge with ultrasonic waves at a frequency of 40KHZ, stop the ultrasonic treatment after 30 minutes, stand still for 20 minutes, separate the upper layer of crude oil, and mix the separated solid phase residue with oil residue, dry and incinerate for later use.

[0027] (4) Add conditioner to the remaining sludge in step 3 according to 4% of the dry weight of the sludge. The composition ratio of the conditioner is: humic acid 15%, sludge incineration as...

Embodiment 2

[0032] (1) Add water to the oily sludge with a moisture content of 80%-90% to adjust the moisture content to about 95%, and filter it with a 100-mesh stainless steel filter.

[0033] (2) Adjust the pH to about 7 and the temperature at 50-60°C, and add a biological demulsifier to the filtered sludge. The demulsifier is a total fermentation culture of Bacillus subtilis in the decline stage with a mass fraction of 5%-10% liquid, the dosage is 30mg / L, stir to make it homogenized.

[0034] (3) While stirring in step 2), treat the sludge with ultrasonic waves at a frequency of 50KHZ. After 30 minutes, stop the ultrasonic treatment and stand still for 20 minutes to separate the upper layer of crude oil.

[0035] (4) Add conditioner to the remaining sludge in step 3 according to 5% of the dry weight of the sludge. The composition ratio of the conditioner is: humic acid 30%, sludge incineration ash 30%, activity White clay 30%, walnut shell activated carbon 5%, aluminum sulfate 5%. A...

Embodiment 3

[0040] (1) Add water to the oily sludge with a moisture content of 80%-90% to adjust the moisture content to about 95%, and filter it with a 100-mesh stainless steel filter.

[0041] (2) Adjust the pH to about 7 and the temperature at 50-60°C, and add a biological demulsifier to the filtered sludge. The demulsifier is a total fermentation culture of Bacillus subtilis in the decline stage with a mass fraction of 5%-10% Liquid, the dosage is 40mg / L, stir to make it homogenized.

[0042](3) While stirring in step 2, treat the sludge with ultrasonic waves at a frequency of 60KHZ, stop the ultrasonic treatment after stirring for 40 minutes, stand still for 20 minutes, separate the upper layer of crude oil, and mix the separated solid phase residue with oil residue, dry and incinerate for later use .

[0043] (4) Add conditioner to the remaining sludge in step 3 according to 5% of the dry weight of the sludge. The composition ratio of the conditioner is: humic acid 20%, sludge inci...

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PUM

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Abstract

The invention relates to a treatment method for oily sludge of an oil refinery and belongs to the technical field of sludge treatment. According to the method, firstly, the oily sludge is treated in a manner that a biological demulsifier is assisted with a low-frequency ultrasonic technique, and upper-layer floating oil is removed after precipitating; by a moisture separation device, crude oil can be effectively recovered from the sludge, the recovery rate of the crude oil can be up to 86-95%, and a separated solid phase can be used as a conditioner component after incineration; a conditioner is added into remaining sludge, stirring is carried out while ultrasonic conditioning is assisted, then, the sludge is pumped into a plate-and-frame press filter for dehydrating, the moisture in the sludge can be removed to the maximum, the moisture content of the conditioned sludge is lowered to about 60% from 80-90%, and sludge cakes can be made into an auxiliary fuel when being air-dried until the moisture content of the sludge is 10%; the time spent in the whole process is short, and oil residues and pressure filtrate can be recycled and do not cause secondary pollution, so that the oily sludge treatment method is rapid and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and relates to a treatment method for oily sludge. Background technique [0002] Oily sludge in refineries mainly comes from the bottom sludge of grease trap, flotation tank scum, crude oil tank bottom sludge, etc., commonly known as "three muds". These oily sludges have different compositions, usually with an oil content of 10% to 50%. The water content is between 40% and 90%, accompanied by a certain amount of solids. Oily sludge has complex components and is difficult to treat. Most of them contain benzene series, phenols, anthracene, pyrene and other substances, which are odorous and toxic. If they are discharged without treatment, they will seriously damage the natural environment. In addition, oily sludge contains If some crude oil can be extracted and recycled, it can not only reduce the pollution of oil sludge to the environment, but also maximize the utilization of oily sludge r...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14C10L5/46C10G1/00
CPCY02E50/10Y02E50/30
Inventor 李依丽杨珊珊李艳玲尹晶
Owner BEIJING UNIV OF TECH
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