US 2019/0300795 A1 · Treatment Process for Polluted Oil Sludge

Abstract

Treatment systems, agents and processes are described for processing polluted oil sludge into environmentally harmless and reusable resources. The oil sludge is first crushed, mixed with water, stirred, and stratified, then the overflow layer with the oil slick is transferred into oil recovery tank; the remaining mixture of solid and liquid is then subjected to centrifugal solid-liquid separation, the resulting free water is collected for reuse through osmosis, and the remaining solid phase material goes through a secondary oil content reduction treatment, adding water, degradable treatment agent, stirring, and after the system was standing stratified, the upper layer with the oil slick is overflowed and transferred to oil recovery tank; for the mixture from the centrifugation separation and reduction treatment processes, the resulting liquid phase is subjected to oil water separation, the oil phase is transferred into the oil recovery tank, the water phase enters into the wastewater recycling tank for recycle and reuse, the remaining solid phase is treated to become environmentally harmless materials; undergo centrifugal separation again, and the liquid phase is distilled to recover the plant based treatment agent, the remaining oil is transferred to the oil recovery tank, and the excess sludge is dried.

Claims12

Dependent claims

A method for processing an oil sludge sample into an environmentally harmless resource, comprising the following steps:

(1) crushing the oil sludge, mixing with water, and then stirring, and after standing and stratification, extracting the upper layer of oil slick through overflow process;
(2) subjecting the solid-liquid phase obtained from step (1) to solid-liquid separation by centrifugation, subjecting the solid phase after separation to a second reduction treatment, adding water to the mixture, adding a degradable treatment agent, and stirring the mixture stirred until the system is static, and extracting the upper oil slick through overflow, so as to reduce the solid phase oil content to less than 5 percent;
(3) confirming that the oil content of the solid phase obtained from step (2) is not higher than 5 percent, and if so, repeating step (2) to reduce the amount of oil until the content is less than 5 percent;
(4) subjecting the liquid phase in the mixture resulting from step (2) or (3) to oil water separation, transferring the oil phase into the oil recovery tank, and sending the water phase to enter the wastewater recycling tank for recycle and reuse, and then subjecting the remaining solid phase to treatment to make it harmless by adding recoverable treatment agent;
(5) subjecting the mixture resulting from step (4) to centrifugal separation, and sending the liquid phase through distillation to recover the treatment agent, transferring the remaining oil into the oil recovery tank, and drying the excess sludge.

2 more elements

Dependencies are inferred from the claim text.

Treatment Process for Polluted Oil Sludge

Life of this patent

Treatment Process for Polluted Oil Sludge

Life of this patent

Abstract

Claims12