Oily sludge treatment method suitable for heavy bottom oil sludge and tank cleaning oil sludge

A technology of oil sludge and bottom oil, which is applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. Problems such as high rate, equipment not working properly, etc.

Active Publication Date: 2020-11-13
西安德兴环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most enterprises treat the oily scum in the sewage treatment plant and the oily sludge at the bottom of the adjustment pool, or mechanically dehydrate it and then enter the coking unit, or use traditional simple sedimentation and centrifugation with unsatisfactory results, and then hand it over to a qualified treatment unit. co-processing
The current oil sludge treatment technology has a better effect on the treatment of scum in the sewage treatment plant, sludge at the bottom of the adjustment tank and activated sludge, and sludge at the bottom of the light oil tank area. The heavy bottom sludge in the oil tank area contains a large amount of colloid, asphaltene and other components, and has a high viscosity. The existing treatment technology has the following problems in the operation process, which makes the equipment unable to operate normally: 1. Recombination in the sludge Partially adhered to the pH probe, resulting in inaccurate pH measurement or damage to the pH meter, which affects the normal operation of the system; 2. The bottom of the sludge separation device is prone to deposit sludge, which blocks the drainage pipe, affecting the continuous and stable operation of the device; 3. Discharge of the dry sludge bin There are often cases of poor unloading
As for the clear tank sludge, it has a strong odor and is sticky, and on the basis of the properties of the heavy bottom sludge, it also has the characteristics of high oil content, high solid content, low water content, poor fluidity or even basically no fluidity. , the existing technology is unable to deal with it

Method used

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  • Oily sludge treatment method suitable for heavy bottom oil sludge and tank cleaning oil sludge
  • Oily sludge treatment method suitable for heavy bottom oil sludge and tank cleaning oil sludge
  • Oily sludge treatment method suitable for heavy bottom oil sludge and tank cleaning oil sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Add 10m in the heavy bottom oil sludge regulating tank of embodiment 1 3 Heavy bottom sludge S 1 , S 1 ’, add 15m in the scum regulating tank 3 Scum S 2 , the temperature in the two adjustment tanks is maintained at 40°C by means of steam coils, which are transported to the oil sludge separation device through pumps respectively, and 98% concentrated sulfuric acid is added at the same time, and the pH of the oil sludge separation device is adjusted to 1.5. After the acid is stopped, the oil sludge separation device Set up heat preservation, stand and separate at 40°C for 72 hours.

[0079] The recovered waste oil S is extracted from the upper part of the sludge separation device 0 , and then discharge all the middle clear liquid and lower bottom sludge of the oil sludge separation device into the sludge concentrator and then sample S 3 , S 3 ’, add 30% sodium hydroxide solution in the sludge concentrator to adjust the pH to 7, the S 0 , S 1 , S 2 , S 3 Carry o...

Embodiment 2

[0096] The bottom sludge of a crude oil tank area of ​​a petrochemical enterprise was taken. According to laboratory analysis, the solid content of the bottom sludge was 8.21%, the oil content was 31.65% (light oil content was 5.34%), and the water content was 60.14%. Put 200 g of this bottom sludge into a 1000 mL separatory funnel, then add 400 mL of distilled water to the separatory funnel, add 98% sulfuric acid to the separatory funnel, and adjust the pH to 2 after shaking well. Put the separatory funnel in a 40°C water bath at a constant temperature for 72 hours, discharge all the mud-water mixture in the lower part of the separatory funnel into the measuring cylinder, measure the total volume of the mud-water mixture to be 580mL, and analyze and determine its light oil content to be 0.16%. Therefore, the light oil recovery rate is: (200×5.34%-580×0.16%) / (200×5.34%)=91.31%.

Embodiment 3

[0098] The oil sludge from a petrochemical enterprise was taken, and the solid content of the oil sludge was 25.7%, the oil content was 30% (the light oil content was 4.86%), and the water content was 44.3%. Put 200 g of the clear tank sludge into a 1000 mL separatory funnel, then add 400 mL of distilled water into the separatory funnel, add 98% sulfuric acid into the separatory funnel, shake well and adjust the pH to 2. Put the separatory funnel in a 40°C water bath at a constant temperature for 72 hours, then discharge all the mud-water mixture in the lower part of the separatory funnel into the measuring cylinder, and measure the total volume of the mud-water mixture to be 583mL, and analyze and determine that the light oil content is 0.12%. Therefore, the light oil recovery rate is: (200×4.86%-583×0.12%) / (200×4.86%)=92.8%.

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Abstract

The invention provides an oily sludge treatment method suitable for heavy bottom oil sludge and tank cleaning oil sludge. According to the method, heavy oily sludge is optimized before oil-sludge separation, the oil sludge is fully and uniformly mixed with the demulsifier before demulsification and separation, the pH measurement mode is redesigned, the system is conveniently controlled to be in astable pH value range, and the closed-loop property of the flow line of the whole treatment process is redesigned so that the initial investment cost and the energy consumption rate of the whole process method are reduced; in addition, the invention further provides a gravity type oil sludge separation device which comprises a vertical cylinder body, a flow guide cylinder arranged in the verticalcylinder body, an oil sludge feeding assembly, a light dirty oil discharging assembly, a middle clear liquid discharging assembly and a bottom mud discharging assembly.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of oily sludge in oil fields and petrochemical industries, in particular to an oily sludge treatment method suitable for heavy bottom sludge and tank cleaning sludge. Background technique [0002] Oil sludge is one of the main pollutants produced during the storage, transportation and refining process of oil products. It contains a large amount of benzene series, phenols, anthracene, pyrene and other odorous toxic substances. The composition is complex and belongs to hazardous waste. It is listed as HW08 hazardous waste in the "National Hazardous Waste List". [0003] According to incomplete statistics, the total amount of oily sludge produced in my country every year reaches more than 5 million tons, and with the deep exploitation of most oil fields, the output of oily sludge will continue to increase. The composition of oil sludge is extremely complex, and its composition varies grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14C02F11/121C02F11/13C02F9/04C02F103/36
CPCC02F11/00C02F11/14C02F11/143C02F11/145C02F11/147C02F11/121C02F11/13C02F1/40C02F1/66C02F2303/02C02F2209/06C02F2103/365
Inventor 罗德春
Owner 西安德兴环保科技有限公司
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