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Method for comprehensive treatment of oily sludge based on hydrothermal technology

A comprehensive treatment and oily sludge technology, applied in water/sludge/sewage treatment, sludge treatment, oxidation treatment of sludge, etc., can solve problems such as environmental pollution and waste of resources

Active Publication Date: 2017-02-15
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hazards of oily sludge mainly come from the organic matter in it. If it is not effectively treated and disposed of, it will not only cause waste of resources, but also lead to long-term and serious environmental pollution.

Method used

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  • Method for comprehensive treatment of oily sludge based on hydrothermal technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 (laboratory scale)

[0021] The oily sludge produced by drilling a shale gas vertical well has a total organic content of 26.2%, of which oil organic matter is 20.6% and non-oil organic matter is 5.6%.

[0022] Using high temperature and high pressure water 3 at 330°C and 13MPa, with a flow rate of 5 liters per hour, 42.5 kg of oily sludge 1 is hydrothermally extracted in an intermittent extraction method. After about 20 minutes of extraction, the resulting waste to be treated The residue 10 is then hydrothermally oxidized 12, the oxidant 11 is air, the oxygen peroxide is 3.5, the reaction temperature is 380°C, and the reaction pressure is 22.5 MPa. After 45 minutes, the organic matter in it is completely eluted to form the final residue 13; The oil-water mixture 5 produced by the hydrothermal extraction 4 is separated into the oil phase 2 in the oil-water separator 6; the remaining liquid and the liquid produced by the hydrothermal oxidation 12 are merged ...

Embodiment 2

[0023] Embodiment 2 (laboratory scale)

[0024] The oily sludge produced by drilling a shale gas horizontal well has a total organic content of 14.1%, of which oily organic matter is 13.2% and non-oily organic matter is 0.9%.

[0025] Using 250°C, 4.5MPa high-temperature and high-pressure water 3, with a flow rate of 3 liters / hour, 42.5 kg of oily sludge 1 is hydrothermally extracted by intermittent extraction methods. After about 90 minutes of extraction, the final residue is formed. 13. The oil-water mixture 5 produced by the hydrothermal extraction 4 is separated into the oil phase 2 in the oil-water separator 6; the remaining liquid is organic waste water 7, which is oxidatively degraded by deep degradation 8 of biodegradation; after analysis, the hydrothermal extraction 2 The oil content of the residue 10 to be treated is 0.8%, the total organic matter content in the final residue 13 is 0.8%, and the effluent 9 reaches the secondary standard of "GB8978-1996 Comprehensive ...

Embodiment 3

[0026] Embodiment 3 (laboratory scale)

[0027]The oily sludge produced by drilling a shale gas vertical well has a total organic content of 28.5%, of which oil organic matter is 22.4% and non-oil organic matter is 6.1%.

[0028] Using high-temperature and high-pressure water 3 at 100°C and 20MPa, with a flow rate of 6 liters / hour, 42.5 kg of oily sludge 1 is hydrothermally extracted in a continuous extraction method. After about 120 minutes of extraction, the resulting waste to be treated The residue 10 is then hydrothermally oxidized 12, the oxidant 11 is air, the amount of oxygen peroxide is 15, the reaction temperature is 200°C, and the reaction pressure is 23MPa. After 60 minutes, the organic matter in it is completely eluted to form the final residue 13; water The oil-water mixture 5 produced by the thermal extraction 4 is separated into the oil phase 2 in the oil-water separator 6; the remaining liquid and the liquid produced by the hydrothermal oxidation 12 are merged ...

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Abstract

The invention discloses a method for comprehensive treatment of oily sludge based on a hydrothermal technology. The method mainly relates to two parts, namely hydrothermal extraction and hydrothermal oxidation. The method comprises the following steps: firstly, extracting most of oil type organic matters in the oily sludge by adopting a hydrothermal extraction method, and recovering the oil type organic matters by virtue of an oil-water separator; secondly, oxidizing, degrading and eluting non-oil type organic matters in residues after extraction by adopting a hydrothermal oxidation method, performing advanced treatment on generated wastewater and wastewater after extraction together, and discharging the wastewater after the wastewater reaches standard; and finally, performing up-to-standard release or resource utilization on solid residues. According to the method disclosed by the invention, high-temperature high-pressure water is used for performing non-polar extraction and recovery on the oil type organic matters, and killing all pathogenic bacteria in the oil type organic matters, treated effluent and residues are further treated or subjected to resource utilization, and then a treatment target of reduction, harmlessness and resource utilization of the oily sludge is further achieved.

Description

technical field [0001] The invention relates to a treatment method for oily sludge, in particular to a comprehensive treatment method for oily sludge based on hydrothermal technology, and belongs to the technical field of chemical environmental protection. Background technique [0002] Oily sludge generally refers to solid or semi-solid waste composed of three phases of oil, water and solid. There are many kinds of oily sludge, which mainly come from the oil and gas industry, such as oily drill cuttings produced during the drilling process of oil and gas fields during the exploration and production stages, ground sludge and tank bottom sludge during storage and transportation of crude oil and refined products, Sludge and oil residue produced by sewage in the refining process. Organic matter in oily sludge can be divided into oily organic matter and non-oily organic matter. The former is mainly composed of hydrocarbons and aromatic organic matter, which can be extracted by m...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06
CPCC02F11/00C02F11/06
Inventor 陈忠徐愿坚王光伟陈鸿珍苏海锋徐贵华
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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