Modular oil-based sludge separation and treatment system

A method for recovering oil from oil-based sludge comprising:

• homogenizing an oil-rich phase, a water-rich phase, and a solids-rich phase of an oil-based sludge;
• removing particulates from the oil-based sludge as the sludge traverses a shaker screen;
• heating the sludge;
• injecting a chemical into the heated sludge and mixing the chemical with the heated sludge;
• separating the phases of the chemically-treated sludge into a solids component stream, a water component stream, a first oil component stream, and a gas component stream;
• removing solids from the first oil component stream with a decanting centrifuge to form a second oil component stream;
• and
• removing water and solids from the second oil component stream with a disk stack centrifuge to form a third oil component stream.

A method for recovering oil from oil-based sludge, comprising:

• homogenizing an oil-based sludge;
• removing particulates from the oil-based sludge as the sludge traverses a shaker screen;
• heating the debris-free sludge;
• injecting a chemical into the heated sludge and mixing the chemical with the heated sludge;
• removing solids from the chemically-treated sludge to form a decanter-processed sludge;
• injecting a second chemical into the decanter-processed sludge and mixing the second chemical with the decanter-processed sludge;
• separating the phases of the second chemically-treated sludge to form a solids component stream, a first water component stream, a first oil component stream, and a first gas component stream;
• and
• removing water and solids from the first oil component stream to form a second oil component stream.

A method for recovering oil from oil-based sludge, comprising:

• homogenizing an oil-based sludge;
• removing particulates from the oil-based sludge as the sludge traverses a shaker screen;
• heating the sludge;
• injecting a chemical into the heated sludge and mixing the chemical with the heated sludge;
• separating the phases of the chemically-treated sludge to form a first solids component stream, a first water component stream, a first oil component stream, and a first gas component stream;
• and
• removing water and solids from the first oil component stream to form a second solids component stream, a second water component stream, and a second oil component stream.