Harmless recycling treatment method for oily sludge

Abstract

The invention provides a harmless recycling treatment method for oily sludge. The harmless recycling treatment method comprises the following steps: carrying out crushing treatment on the oily sludge;uniformly blending the oily sludge with water and stirring; after standing and layering, overflowing and separating out upper-layer floating oil to a petroleum recycling tank; treating a residual solid-liquid phase and carrying out centrifugal solid-liquid separation to obtain free water and infiltrating the free water to use; carrying out second-time decrement treatment on a residual solid phase; adding water and a degradable treatment agent and stirring; after standing and layering a system, overflowing the upper-layer floating oil into the petroleum recycling tank; centrifuging and separating a mixture obtained by the decrement treatment and carrying out oil-water separation on an obtained liquid phase; conveying an oil phase into the petroleum recycling tank and conveying the water phase into a sewage infiltration tank for circular utilization; carrying out harmful treatment on the residual solid phase; centrifuging and separating; distilling the liquid phase to recycle a plant treatment agent; conveying residual oil into the petroleum recycling tank and drying residual sludge. The harmless recycling treatment method for the oily sludge is simple to operate and has a wide application range and an extremely high oil removal rate; wastewater is recycled and the treated sewage can be directly used for farmland planting.

Description

technical field [0001] The invention belongs to the field of petroleum environmental protection, and in particular relates to a harmless treatment process of oily sludge, which recovers crude oil in the sludge and makes the sludge harmless. Background technique [0002] Oilfield oily sludge is one of the oily solid hazardous wastes produced during oilfield development, oil storage and transportation, and refining and processing. It has the characteristics of high oil content, high viscosity, fine particles, and difficult dehydration. The composition of oily sludge is extremely complex, generally containing a large amount of aged crude oil, wax, asphaltene, colloid and solid suspended matter, bacteria, salt, acid gas and a small amount of heavy metal salts such as copper, zinc, chromium, mercury, etc. Contains benzene series, phenols, anthracene, pyrene and other toxic substances with foul smell. If these components are not properly treated, direct discharge will cause serio...

AI Technical Summary

Problems solved by technology

[0009] In the prior art, the oil sludge after several treatments described in the patent CN 107352765 A can only be used for pressing bricks, indicating that the oil content of the oil sludge after treatment is still higher than 1%, and the harmless effect has not been achieved; while CN A refinery oily sludge disposal system and method disclosed in 107500501 A uses high temperature pyrolysis above 400°C. Although the degree of reduction is over 96%, it consumes a lot of energy and produces harmful substances such as flue gas during the treatment process , causing a secondary threat to the environment; and a kind of medicament for treating oily sludge and its preparation method described in CN107381983 A, although its effect is good, its medicament preparation is complicated, and the application range of treating oily sludge is narrow, and the cycle is long More than half a month; CN 107162360 A, a treatment agent described in a high-efficiency oily sludge treatment agent, although its oily sludge treatment effect is better, but it needs to be exposed to the sun for more than 20 days, the floor area is too large, and the treatment cycle is too long long; CN 107253810 A described in a kind of oily sludge treatment method can only reduce the oily sludge oil content to less than 2% after several treatments, which does not reach the agricultural soil use standard

Images