A treatment method for harmless recycling of oily sludge

Abstract

The invention provides a treatment method for harmless resource utilization of oily sludge. The oily sludge is crushed, mixed with water, stirred, and left to separate into layers, and the overflow separates the upper layer of slick oil into the oil recovery tank; the remaining solid-liquid phase is centrifuged for solid-liquid separation, and the obtained free Water re-osmosis is used, the remaining solid phase is subjected to the second reduction treatment, adding water and degradable treatment agent, stirring, after the system is allowed to stand and separate, it overflows the upper layer of oil slick to the oil recovery tank; centrifugal separation reduction After chemical treatment, the obtained liquid phase is subjected to oil-water separation, the oil phase enters the oil recovery tank, and the water phase enters the sewage reinfiltration tank for recycling, and the remaining solid phase is harmlessly treated; centrifuged, the liquid phase is distilled The plant treatment agent is recovered, the remaining oil enters the oil recovery tank, and the remaining sludge is dried. The invention has the advantages of simple operation, wide application range, high oil removal rate, waste water reuse, and treated sludge 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...

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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

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