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Combined treatment method for oil-containing sludge

A combined treatment and oil sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of high organic content in solid phase, large equipment investment, multiple Energy consumption and other issues, to achieve the effect of strong extraction capacity, less usage, and elimination of capillary resistance

Active Publication Date: 2013-08-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology does not carry out deep dehydration treatment on the oily sludge before extraction. During the process, there is too much water in the oily sludge, the extraction is not thorough, and the organic content in the separated solid phase is high, and the material needs to be heated during the extraction process. , requires multi-stage extraction, long process flow, many equipment, large equipment investment, and large energy consumption
[0007] CN101633574A and CN101362979A propose a treatment method for oily sludge, which involves conditioning and filtering the oily sludge and mixing it with coal as fuel, but fails to recycle the oil in the oily sludge
However, more energy consumption is required in the sludge drying process (if the water content of oily sludge is reduced from 80% to 40%, 0.67 tons of water needs to be evaporated per ton of sludge), and a certain amount of Exhaust gas also needs to be treated up to the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Take 1 liter of oily sludge with a water content of 96.2% and an oil content of 2.2%, add 25 mg of aluminum sulfate, 10 mg of cationic polyacrylamide, 10 mg of chlorine dioxide, and 5 mg of concentrated sulfuric acid (98%), stir and temper for 5 minutes, and then throw Add 30 mg of sodium decylbenzenesulfonate, 5 mg of sodium tripolyphosphate, and 15 mg of sodium chloride. After stirring for 10 minutes, the water content of the oily sludge after being treated by a plate and frame filter press is reduced to 84.1%, and the oil content is 8.3%. The oily sludge is sent into the press, the pressing temperature is 25°C, and the pressure is 20MPa. After pressing for 10 minutes, the water content of the mud cake is 34.0%, and the oil content is 48.5%. Then the mud cake and the extractant (the extractant consists of: The main agent is 94% (v / v), the auxiliary agent is 5% (v / v), and the auxiliary agent is 1% (v / v). ~150°C and 80~100°C boiling range distillates) were mixed and ext...

Embodiment 2

[0065] Take 1 liter of oily sludge with a water content of 98.1% and an oil content of 1.1%, add 50 mg of aluminum chloride, 20 mg of cationic polyacrylamide, 15 mg of sodium hypochlorite, and 5 mg of sodium hydroxide, stir for 8 minutes, and then add decylbenzene 50 mg of sodium sulfonate, 15 mg of sodium hexametaphosphate, and 15 mg of sodium chloride were stirred for 12 minutes, and passed through a decanter centrifugal dehydrator. After treatment, the water content was 81.3%, and the oil content was 13.5%. Enter extruder, temperature 12 ℃, pressure 8MPa, processing time is 15min, and the moisture content of generation mud cake is 40.0%, and oil content is 42.9%, then mud cake and extraction agent (extraction agent is made up of: main agent 92% (v / v), auxiliary agent 7% (v / v), auxiliary agent 1% (v / v), wherein the main agent, auxiliary agent and auxiliary agent are respectively selected from naphtha 115 ~ 135 ° C, 140 ~ 150 ° C and 80 ~ Distillate oil with a boiling range ...

Embodiment 3

[0069] Take 1 liter of oily sludge with a moisture content of 97.8% and an oil content of 1.5%, add 200 mg of ferric sulfate, 120 mg of anionic polyacrylamide, 80 mg of chlorine gas, and 35 mg of phosphoric acid, stir for 8 minutes, and then add sodium octylbenzenesulfonate 40mg, sodium bicarbonate 3mg, hydroxyethylidene diphosphonic acid (HEDP) 10mg, sodium sulfate 20mg, after stirring for 16min, the water content was 83.4% and the oil content was 9.1% after being processed by a plate and frame filter press. Enter extruder, temperature 32 ℃, pressure 32MPa, after holding pressure 15min, generate mud cake water content rate is 22.0%, oil content rate is 58.9%, and it and extractant (extractant composition is: main agent 91% (v / v) , auxiliary agent 8.5% (v / v), auxiliary agent 0.5% (v / v), of which the main agent, auxiliary agent and auxiliary agent are respectively selected from naphtha 115-135 ℃, 140-150 ℃ and 80-100 ℃ boiling The distillate oil in the process) was mixed and ex...

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Abstract

The invention relates to a combined treatment technology for oil-containing sludge, which is particularly suitable for oil-containing sludge which is generated in sewage treatment processes of petrochemical plants. The method comprises: adding a texturizer into the oil-containing sludge for texturizing treatment, adding an oil displacement agent for uniformly mixing, mechanically dehydrating the oil-containing sludge to reduce a water content to 50-90%, then sending the oil-containing sludge into squeezing equipment for squeezing, mixing mud cakes after squeezing with a mixed extractant, uniformly stirring for extraction, sending a mixture into a solid-liquid separator after extraction, introducing a separated liquid into a rectifying tower for regenerating the extractant, and mixing separated solid residue after dried with coal to used as a fuel. The treatment technology of the invention has advantages of low energy consumption for oil-containing sludge treatment, and fast extraction speed, can recover oil in the oil-containing sludge, and can implement resource utilization and harmlessness treatment of the oil-containing sludge.

Description

technical field [0001] The invention relates to a combined treatment method of oily sludge, in particular to a method in which the oily sludge produced in an oil refinery or an oil refinery sewage treatment plant is subjected to conditioning, mechanical separation, press dehydration and extraction treatment with a mixed extractant. 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, excess 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 with sufficient mixing and high viscosity. It is difficult for the solid phase to settle completely, and it is difficult to treat oily sludge. At present, in my country's petrochemical industry, an average of 800,000 tons of oily sludge is produced ...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12
Inventor 杨岳李常青刘光利江岩梁宝锋巫树锋王军曹凤霞王小雄王立蓉刘志花
Owner PETROCHINA CO LTD
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