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Process for treating oily sludge

A sludge treatment and treatment process technology, applied in water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, biological water/sewage treatment, etc., can solve the waste of petroleum resources and insufficient treatment of oily sludge , complex equipment and other problems, to achieve the effect of recycling, realizing harmless treatment and reducing energy consumption

Active Publication Date: 2010-09-08
PETROCHINA CO LTD
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Problems solved by technology

In view of the high water content of oily sludge, sufficient emulsification of water, oil, and solids, complex chemical composition, high viscosity, and difficulty in completely settling the solid phase, it is difficult to dehydrate oily sludge during the treatment process, resulting in high treatment costs and large investment. Difficult to solve completely
In the past 20 years, although there have been a variety of research reports on oily sludge, and the treatment technologies for oily sludge are also varied, each method has its own advantages and disadvantages and the scope of application. Nowadays, the treatment technology of oily sludge is difficult Be popularized and applied to form industrialized production
At present, the problem of oily sludge treatment has been difficult to solve economically and rationally, and it is often treated by open-air stacking or landfill. These sludges generally contain hydrocarbons, benzene series, phenols, and anthracene, accompanied by stench and Toxicity, if it comes into direct contact with the natural environment, it will cause great pollution to soil, water and vegetation, and it also means a waste of oil resources
This method has long process flow, complex equipment, harsh operating conditions and high energy consumption.
In addition, some patent documents also involve the treatment of oily sludge, but the oily sludge treatment technologies involved in these patent documents have high energy consumption, complicated process flow, harsh operating conditions, or insufficient treatment of oily sludge. inadequacies of

Method used

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  • Process for treating oily sludge
  • Process for treating oily sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0028]The oily sludge produced by a refinery sewage treatment plant has a water content of 75.5wt%, an oil content of 19.6wt%, and a solid content of 4.9wt% after mechanical dehydration. After the sludge was dried in the paddle-leaf sludge dryer (drying temperature 300°C, pressure 20kpa (absolute pressure)) for 85min, the water content of the coke produced was 1.2wt%, and its mass ratio to butane was 1 : 95 mixed for extraction for 30min (at a temperature of 0°C). After the extraction is completed, the solid-liquid mixture is sent to a centrifugal separator, and the separated liquid phase mixture is recycled after solvent regeneration in the rectifying tower, and the solid phase enters the rotary The evaporator, at a temperature of 180°C and a pressure of 100KPa (absolute pressure), evaporated for 65 minutes to obtain the final solid waste residue. The analysis results are shown in Table 1. The analysis results show that the final residue generated by this treatment method can...

Embodiment 2

[0032] The oily sludge produced by a refinery sewage treatment plant has a water content of 79.5wt%, an oil content of 15.7wt%, and a solid content of 4.8wt% after mechanical dehydration. The sludge is dried in the rotary kiln evaporator at a temperature of 300°C and a pressure of 100KPa (absolute pressure). After drying for 75 minutes, the water content of the coke produced is 58.5wt%, and its mass ratio to octane is 1 : 8 mixed for extraction, the extraction temperature is 45°C, and the extraction time is 15min. After the extraction is completed, the solid-liquid mixture is sent to a centrifugal separator, and the separated liquid phase mixture is recycled after realizing solvent regeneration in the rectifying tower. The solid phase enters the rotary kiln evaporator and evaporates for 72 minutes at a temperature of 150°C and a pressure of 60kpa (absolute pressure) to obtain the final solid waste residue. The analysis results show that the residue generated by this treatment m...

Embodiment 3

[0036] The oily sludge produced by a refinery sewage treatment plant has a water content of 82.5wt%, an oil content of 15.7wt%, and a solid content of 4.8wt% after mechanical dehydration. This sludge is 160 ℃ in the rotary evaporation heater, under the condition of 40kpa (absolute pressure) at the temperature, after drying for 60min, the water content of the coke produced is 40.5wt%, and its mass ratio with diesel oil is 1: 20 mixed for extraction, the extraction temperature is 20°C, and the extraction time is 10 minutes. After the extraction is completed, the solid-liquid mixture is sent to a centrifugal separator, and the separated liquid-phase mixture is regenerated in the rectification tower and then recycled. The phase enters the rotary steam evaporator and evaporates at a temperature of 135°C and a pressure of 60KPa (absolute pressure) for 80 minutes to obtain the final solid waste residue. The analysis results show that the residue generated by this treatment method can ...

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Abstract

The invention relates to a process for treating oily sludge and is particularly applicable to the oily sludge generated in the wastewater treatment process of an oil refinery. The process has the following steps of: after performing anhydration treatment on centrifugally dehydrated oily sludge in rotary-type anhydration treatment equipment under certain negative pressure and temperature control to destroy a water, oil and solid stabilizing system of the oily sludge, evaporating part of oil and water in the oily sludge, and performing solvent extraction treatment on coke generated after the anhydration. Solid residue obtained after treatment reaches the solid emission standard; the wastewater generated in the process can reach standard after biochemical treatment and is discharged; the extracted oil can be used as fuel or used for refining; and an extractant can be regenerated and recycled. The process has main characteristics of high sludge anhydrating and extracting speed, high efficiency, good effect, mild operating condition, little energy consumption, good sludge treatment effect and simple equipment operation and maintenance.

Description

technical field [0001] The invention relates to a treatment process for oily sludge, in particular to a harmless and resourceful treatment process for oily sludge produced in oil refineries and refinery sewage treatment plants. Background technique [0002] Refining and chemical enterprises produce a large amount of oily sludge in the process of petroleum refining and wastewater treatment, which mainly come from grease traps, flotation tanks, biologically activated sludge, crude oil dehydration tanks, oil storage tanks and waste oil tanks. These sludges are complex in composition and belong to a relatively stable multi-phase system, generally composed of oil-in-water, water-in-oil and suspended solids, and are fully emulsified, with high viscosity, and it is difficult for the solid phase to settle completely, which brings a great deal of trouble to sludge treatment. difficulty. At present, in my country's petrochemical industry, an average of 800,000 tons of oily sludge is ...

Claims

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Application Information

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IPC IPC(8): C02F11/12C02F3/00C10L1/00
Inventor 刘发强杨岳江岩李常青刘光利梁宝锋王立蓉刘志花
Owner PETROCHINA CO LTD
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