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A method for treating oily sludge in an oil refinery

A treatment method and oil sludge technology, which is applied in the directions of sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the constraints of oil sludge treatment process progress, complex equipment and operation process, Deal with problems such as unsatisfactory results, achieve significant economic and social benefits, improve efficiency, and prevent secondary pollution

Inactive Publication Date: 2016-01-13
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 equipment and operation process, etc., which seriously restrict oil sludge treatment. progress of craft
However, due to the large amount of electricity required for ultrasonic waves, the processing cost becomes high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0025] (2) Adjust the pH to around 7, the temperature at 50-60℃, and add a biological demulsifier to the filtered sludge. The demulsifier is a complete culture of Bacillus subtilis fermentation with a mass fraction of 5%-10% in the decay phase Liquid, the dosage is 20mg / L, stir to homogenize.

[0026] (3) While stirring in step 2), the sludge is treated with 40KHZ ultrasonic frequency. After 30 minutes, the ultrasonic treatment is stopped, and the upper layer is still for 20 minutes to separate the upper crude oil. The separated solid phase residue and oil residue are mixed and dried and then incinerated for use.

[0027] (4) Add a conditioning agent to the sludge remaining in step 3) according to 4% of the dry weight of the sludge. The component ratio of the conditioning agent is: 15% humic acid, 40% sludge incinera...

Embodiment 2

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

[0033] (2) Adjust the pH to around 7, the temperature at 50-60℃, and add a biological demulsifier to the filtered sludge. The demulsifier is a complete culture of Bacillus subtilis fermentation with a mass fraction of 5%-10% in the decay phase Liquid, the dosage is 30mg / L, stir to homogenize.

[0034] (3) While stirring in step 2), the sludge is treated with 50KHZ ultrasonic frequency. After 30 minutes, the ultrasonic treatment is stopped, and the upper layer of crude oil is separated for 20 minutes. The separated solid phase residue and oil residue are mixed and dried and then incinerated for use.

[0035] (4) Add a conditioning agent to the remaining sludge in step 3) according to 5% of the dry weight of the sludge. The component ratio of the conditioning agent is: humic acid 30%, sludge incineration ash 30%, activ...

Embodiment 3

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

[0041] (2) Adjust the pH to around 7, the temperature at 50-60℃, and add a biological demulsifier to the filtered sludge. The demulsifier is a complete culture of Bacillus subtilis fermentation with a mass fraction of 5%-10% in the decay phase Liquid, the dosage is 40mg / L, stir to homogenize.

[0042] (3) In step 2) while stirring, the sludge is treated with 60KHZ ultrasonic frequency. After stirring for 40 minutes, stop the ultrasonic treatment and stand still for 20 minutes. The upper crude oil is separated. The separated solid phase residue and oil residue are mixed and dried and then incinerated for use. .

[0043] (4) Add a conditioning agent to the remaining sludge in step 3) according to 5% of the dry weight of the sludge. The component ratio of the conditioning agent is: humic acid 20%, sludge incineration a...

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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 of oily sludge. Background technique [0002] The oily sludge of the oil refinery mainly comes from the bottom sludge of the grease trap, the scum of the flotation tank, the bottom sludge of the crude oil tank, etc., commonly known as the "three sludges". These oily sludges have different compositions, usually with an oil content of 10%-50%. Among them, the moisture content is between 40% and 90%, accompanied by a certain amount of solids. The composition of oily sludge is complex and difficult to treat. Most of it contains benzene series, phenols, anthracene, pyrene and other substances, which are odorous and toxic. If they are discharged directly without treatment, it will seriously damage the natural environment. In addition, oily sludge contains If part of crude oil can be extracted and recycled, it can not only reduce the pollution of oil sludge to the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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