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Resource treating method for oil-containing sludge

A treatment method and resource-based technology, applied in the fields of sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc.

Active Publication Date: 2008-01-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the "Eighth Five-Year Plan" in my country, oily sludge treatment technology has made great progress, but due to technical, economic or environmental reasons, it is still in the stage of exploration and research and industrial production trial.

Method used

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  • Resource treating method for oil-containing sludge

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Experimental program
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Effect test

Embodiment 1

[0027] Oil field heavy oil sewage treatment press filter dewatered sludge, the mud cake is naturally dried to obtain dry sludge with a moisture content of 4.7%, and the oil content of the dry sludge is 12%:

[0028] 1. The dry sludge is heated and pyrolyzed under the condition of 600°C for 3 hours, the oil content of the residue is 0.004%, the oil recovery rate is 13.8%, and the gas production rate is 80 cubic meters / ton;

[0029] 2. After adding sulfuric acid to the residue with sulfuric acid at a ratio of 1:2 of the chemical equivalent of aluminum salt and treating it at normal temperature, a mixed solution containing 11.5% aluminum oxide is obtained, which has a good coagulation effect for sewage treatment. Compared with commercial polyaluminium, the addition amount to achieve the same coagulation effect is roughly three times that of commercial polyaluminium.

Embodiment 2

[0031] The tank bottom sludge of the oil-water settling tank in the oil field is heated and dried to obtain dry sludge with a moisture content of 1.7%, and the oil content of the dry sludge is 27.6%:

[0032] 1. The dry sludge is heated and reacted (ie, pyrolyzed) in a closed environment at 550°C for 2 hours, the oil content of the residue is 0.007%, the oil recovery rate is 31.7%, and the gas production rate is 65 cubic meters / ton;

[0033] 2. Determining the adsorption performance of the residue to asphalt, its saturated adsorption capacity is 43.7mg / g (the saturated adsorption capacity of activated clay supplemented and refined by commercial lubricating oil is 44.3mg / g), and the adsorption performance of the activated clay used for supplementary refining of lubricating oil quite.

Embodiment 3

[0035] The dewatered sludge of oil refinery sewage treatment has a water content of 82% and an oil content of 7.6%:

[0036] 1. Sealed heating reaction (i.e. pyrolysis) at 550°C for 3 hours, the oil content of the residue is 0.009%, the oil recovery rate is 9.7%, and the gas production rate is 20 cubic meters / ton;

[0037] 2. After adding hydrochloric acid to the residue with hydrochloric acid at a ratio of 1:2 of the chemical equivalent of aluminum salt and treating it at normal temperature, a mixed solution containing 23.7% aluminum oxide is obtained, which has a good coagulation effect for sewage treatment.

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Abstract

The invention relates to a resource processing method for oily sludge. First, the oily sludge is sent to a closed retorting cracking furnace to be pyrolyzed, and the pyrolyzed period is 1-5 hours under 200-600 DEG C, then the oil, gas, and water are recovered. Second, sulfate or hydrochloride is put into the pyrobitumen of sludge containing inorganic aluminum salt or iron salt flocculant according to the chemical equivalent of the aluminum salt or iron salt 1 to 1-1.5 to do acid-soluble processing. The products after the two processes can be reclaimed and used as the flocculant of the sewage processing system, or reclaimed as the concentrating agent of sludge. The pyrobitumen containing mostly clay mineral can be used as decolorizing and absorbing material of waste water and oil, or used as absorbent for lube-oil complementing and refining process. The method used in oilfield gathering transportation and treatment system can realize zero discharge in course of the gathering transportation and treatment, and can effectively solve the pollution problem of the oily sludge and find the automate answer for the oily sludge. Meanwhile, by adopting the method, the cost for the treatment of sewage flocculation and for adding sludge concentration agent can be reduced and the energy material can be reclaimed from sludge and the wastage of oil can be reduced.

Description

technical field [0001] The invention relates to a method for resourceful treatment of oily sludge, which is suitable for the reduction, resourceful and harmless treatment of oily sludge and other wastes produced in oil field refinery production and sewage treatment systems. Background technique [0002] With the development of oilfields and the extensive application of various production increase measures, the output of waste mainly sewage and sludge is also increasing, and the composition is also more complex, which makes it difficult for sewage reinjection and effluent treatment, and sludge is piled up in the open air Great harm to the surrounding environment. With the increasingly stringent requirements of national regulations and standards for environmental protection, it is a difficult problem for various oil fields to find an oily sludge treatment and disposal process that is technically feasible, easy to operate, economical and effective, and meets the requirements of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F1/28C02F1/52
CPCY02W10/40
Inventor 王万福杜卫东李金海何银花
Owner PETROCHINA CO LTD
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