Oily sludge dewatering

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TOily sludge is divided into oily sludge produced by crude oil mining and oily sludge produced during oil field gathering and transportation. The oily sludge produced during crude oil mining mainly comes from the ground treatment system. The oily sludge produced during the treatment of oil production sewage is used for sewage purification. Flocs, equipment and pipeline corrosion products and scales formed by the water purifying agent added in the treatment. The oily sludge produced in the oil field gathering and transportation process mainly comes from the oil tanks, sedimentation tanks, sewage tanks, grease trap bottom sludge of the transfer station, the joint station, the oily water treatment facility of the refinery, the light hydrocarbon processing plant, and the natural gas purification device Oil sand, oil sludge removed, ground crude oil and oily sludge produced by drilling, oil field operations, and pipeline perforation.

Treatment process

Oily sludge generally has the characteristics of high oil content, high viscosity, fine particles, and difficult dehydration. The sludge has a large stock, which is likely to cause pollution to the surrounding environment and is a hazardous waste.
According to the characteristics of oily sludge, this solution customizes dewatering equipment to facilitate the drying and incineration of the back end.

Characteristic analysis

1. High oil content

Oily sludge usually has an oil content of about 10%-50% and has a high viscosity. When some dehydration equipment is used to dehydrate it, it will cause blockage and adhesion, which will seriously affect the treatment efficiency.

2. Fine particles

The oily sludge has relatively fine particles, relatively serious leakage, and difficult dehydration.

3. Corrosive

As the crude oil produces various heavy metal salts and sulfur-containing corrosion products during the process of mining and processing, the corrosion of the equipment is serious and the service life of the equipment is seriously affected.

4. Harm to health

The sludge contains pathogens such as bacteria. At the same time, because many cyclic aromatic hydrocarbons contained in crude oil are mutagenic and carcinogenic, they cause serious damage to human health through direct and indirect means.

Special type for oily sludge dewatering
Stack screw dehydrator

Aiming at the characteristics of oily sludge, a tailor-made special model is dedicated to solving the best treatment plan for oily sludge.

Technical characteristics 

Drug delivery

1. PAC

Choose the mesh size 30~60, the ratio of the medicine to the absolute dry mud is 5%

2. NaOH

Adjust the pH to weakly alkaline.

3. PAM

Select the molecular weight above 8~10 million, the ion degree is 60, the ratio of the medicine to the absolute dry mud is 0.5%

Stirring cage advancement + dynamic and static ring filter 

1. Concentration and dehydration in one

The stirring cage adopts a wide front and narrow structure design. When a large amount of sludge enters, the front end can quickly filtrate to achieve the flocculation effect, and the rear end gradually narrows, increasing the extrusion force, which can effectively achieve the effect of dehydration and make the sludge cake The moisture content reaches 70~85%.

2. Dynamic and static ring structure

The unique dynamic and static ring filter slits rotate together with the advancement of the stirring cage to realize self-cleaning, which makes the equipment not easy to block, and effectively solves the clogging of the equipment due to the sticky sludge caused by grease.

3. Precision filter

Aiming at the characteristics of sludge, a combination of 0.5mm in the thickening section and 0.2mm in the dewatering section is designed to prevent mud running.

Conical spiral structure

1. Conical spiral

The tapered structure is used to improve the front-end feeding and filtering capacity, and the rear-end shrinks to gradually increase the extrusion force and increase the processing efficiency of the equipment.

2. Alloy steel surfacing + tungsten carbide spraying

The spiral adopts alloy steel surfacing welding and tungsten carbide spraying, so that the blade hardness can be as high as HV1200, which effectively reduces the wear of the equipment.

Conical spiral structure

1. Quick view

Unique one-button quick opening design, easy to operate, you can observe the internal operation of the equipment at any time, check the dehydration effect of each section, and make adjustments in time.

2. Convenient to clear the blockage

It is convenient to remove the blockage quickly and easily. If the blockage caused by the inhalation of hard or fibrous impurities can be quickly removed by observing the inspection port, it can avoid the long-term equipment shutdown caused by the removal of the screw and affect the efficiency of daily production.

Ring piece safety line
A specially-processed ring piece is installed between each segment of the stacked screw, and the wear of the ring piece can be visually observed through the contrast effect of other ring pieces, which is convenient for early maintenance and guarantees the operation of the equipment.
Overall stainless steel material
All sheet metal materials of the equipment are made of SS304 material to ensure that the equipment will not be corroded during long-term operation.
Fully automated continuous operation
The PLC controls the automatic operation of the equipment, and automatically adjusts the operation according to the control conditions. The continuous feeding and discharging mode of the equipment can keep the materials in and out continuously, realize unattended operation, improve operation efficiency, and protect the health and safety of operators.

Case show

Jinling Petrochemical Oil Sludge Treatment

Qilu Petrochemical Oil Sludge Treatment