A system and method for harmless treatment of oily sludge

Abstract

The invention discloses a harmless treatment system and method for oily sludge, and relates to the technical field of sludge treatment .The harmless treatment system for the oily sludge is composed of a mechanical dewatering device, a pretreating device, a gas treating unit, a water treating unit, a drying device, a granulating device, a combustion furnace and a brick making device .The harmless treatment method for the oily sludge is wide in application range, low energy consumption and cost and free of secondary pollution, and wastewater, waste residues and waste gas which are generated in the oily sludge treating process are thoroughly removed through the processes of pretreating, drying, combusting, waste residue treating, waste gas treating and wastewater treating; meanwhile, heat, the waste residues and purified water which are generated in the technological process are recycled, and therefore the oily sludge treating cost is greatly reduced; in addition, emission of the treated wastewater, waste residue and waste gas meets the national environmental protection requirements, and then harmless treatment for the oily sludge is achieved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a system and method for harmless treatment of oily sludge. Background technique [0002] Oily sludge is oily solid waste produced in the process of oil extraction, transportation, refining and oily sewage treatment. The oily sludge produced in oilfield development contains toxic and harmful substances such as sulfide, benzene, phenols, anthracene, pyrene, etc. It is one of the main pollution sources of oil field production and has been included in the "National List of Hazardous Wastes". With the continuous development of major oil fields, the amount of oily sludge is also increasing. For many years, oily sludge has been stored and piled up in anti-seepage tanks, occupying a large amount of land resources, and oily sludge is still growing at a rate of 3% per year. The traditional oily sludge treatment method is mainly to landfill after solidification, which not only ca...

AI Technical Summary

Problems solved by technology

The traditional oily sludge treatment method is mainly landfill after solidification, which not only causes waste of oil resources in oily sludge, but also seriously pollutes the environment

[0003] The existing sludge treatment methods mainly include sieving vulcanization-conditioning-centrifugation, thermal desorption, pyrolysis, incineration, biological treatment, chemical extraction, high-temperature carbonization, etc., among which sieving vulcanization- The oil content of raw materials treated by quenching and tempering-centrifugation method is still greater than 2%, and advanced treatment is required; thermal desorption method is only suitable for sludge with high oil content; pyrolysis method requires high reaction conditions, complex equipment, and high investment Large, high energy consumption, improper operation is easy to cause secondary pollution of the atmosphere; incineration method needs to be mixed with auxiliary fuel, high energy consumption, large investment in equipment, and the generated dust, SO2, etc. will cause secondary pollution; biological treatment method has a long treatment cycle, Poor adaptability, large floor area, and great influence of climate; chemical extraction method has expensive extraction agent, complex equipment, and high processing cost; high-temperature carbonization method requires high reaction conditions, complex equipment, large investment, and high energy consumption

Images