Treating method for oily sludge

A treatment method and sludge technology, which are applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problems of high energy consumption, secondary pollution, complicated treatment, etc. To achieve the effect of simple flue gas treatment, less pollutants, and simplified process flow

Inactive Publication Date: 2017-07-18

安徽省通源环境节能股份有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a treatment method for oily sludge, which solves ...

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Abstract

The invention provides a treating method for oily sludge and relates to the technical field of oily sludge treatment. The treating method provided by the invention comprises the following steps: heating and stirring oily sludge, standing and then performing solid-liquid separation, thereby acquiring oily mud and oily liquid; introducing the oily liquid into a sewage treatment system for performing oil-water separation, and extracting and purifying the separated oil; adding a reagent into the oily mud for tempering; after tempering, deeply dewatering, thereby acquiring dewatered oily mud and filtrate; performing oil-water separation on the filtrate; performing drying treatment and pyrolysis carbonizing treatment on the dewatered oily mud. The treatment method provided by the invention is simple, convenient and efficient and can realize the reduction, harmless and recycling treatment of the oily sludge, the whole treating process flow operation occupies less area and the investment cost is low.

Application Domain

Sludge treatment by de-watering/drying/thickeningAgriculture tools and machines +6

Technology Topic

ChemistryPyrolysis +5

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Examples

Experimental program(5)

Example Embodiment

[0024] Example 1:

[0025] The oily sludge treatment method of this embodiment includes the following steps:

[0026] S1. Heat and stir the oily sludge at a heating temperature of 40°C, a stirring speed of 30r/min, stir for 10 minutes, and stand for 0.5h before performing solid-liquid separation to obtain oily sludge and oily liquid;

[0027] S2, the oily liquid obtained in step S1 is passed into the sewage treatment system for oil-water separation, and the separated oil is extracted and purified;

[0028] S3. Add medicament to the oily sludge obtained in step S1 for conditioning. The amount of medicament added is 1% of the absolute dry weight of the oily sludge. The medicament is polyaluminum chloride which accounts for 0.5% of the absolute dry weight of the oily sludge and accounts for the oily sludge. It is compounded with 0.5% of absolute dry weight of sodium persulfate. After the agent is added, it is stirred at 30r/min and stirred for 5 minutes. The refined sludge is dehydrated mechanically through a belt filter press to obtain dehydrated sludge and filtrate. The filtrate is then subjected to the operation of step S2;

[0029] S4. The sludge dewatered in step S3 is transported to the drying furnace by a screw conveyor, and it is dispersed and crushed by the built-in stirring device, and dried by hot air drying at a drying temperature of 80°C. Pyrolysis and carbonization can be performed after chemical conversion.

[0030] Among them, the drying treatment can ensure that the dried product with uniform quality (1mm particle size) and 20% moisture content can be obtained in a short time.

[0031] Pyrolysis and carbonization treatment refers to the transfer of the dried product into the pyrolysis and carbonization furnace. It uses indirect heating. The side of the hot blast furnace burns to produce high temperature, the temperature is 350℃, and the materials in the furnace are in micro-oxygen Or decompose by heat in an oxygen-free state, the large amount of dry distillation gas produced can be burned through the induced draft fan, and the high-temperature flue gas discharged from the combustion can be pumped to the dryer, saving energy consumption. The output end has a product condensation and collection system. After the product is cooled and collected, a carbonized product with a moisture content of ≤1% can be finally obtained, and the sludge reduction can be achieved by 90%.

Example Embodiment

[0032] Example 2:

[0033] The oily sludge treatment method of this embodiment includes the following steps:

[0034] S1. Heating and stirring the oily sludge at a heating temperature of 120°C, a stirring speed of 130r/min, stirring for 60 minutes, standing for 4 hours, and then performing solid-liquid separation to obtain oily sludge and oily liquid;

[0035] S2, the oily liquid obtained in step S1 is passed into the sewage treatment system for oil-water separation, and the separated oil is extracted and purified;

[0036] S3. Add chemicals to the oily sludge obtained in step S1 for conditioning. The chemicals are polyacrylamide accounting for 5‰ of the absolute dry weight of the oily sludge, ferrous sulfate accounting for 2.5% of the absolute dry weight of the oily sludge, and absolute dry weight of the oily sludge. 5% by weight polyaluminum chloride, 4% by weight of oily sludge, polyferric sulfate, 1% by weight of oily sludge, chitosan, and 3% by weight of oily sludge, surfactants , It is compounded by thickener which accounts for 2% of the absolute dry weight of oily sludge. After the agent is added, it is stirred at 130r/min and stirred for 15 minutes. The tempered sludge is subjected to mechanical deep dehydration through a high-pressure plate and frame filter press to obtain dehydration After the sludge and filtrate, the filtrate is then subjected to the operation of step S2;

[0037] S4. The sludge dewatered in step S3 is transported to the drying furnace by a screw conveyor, and it is dispersed and crushed by the built-in stirring device, and dried by hot air drying at a drying temperature of 200°C. Pyrolysis and carbonization can be performed after chemical conversion.

[0038] Among them, the drying treatment can ensure that a dried product with a uniform quality (particle size of -5mm) and a moisture content of 20% can be obtained in a short time.

[0039] Pyrolysis and carbonization treatment refers to the transfer of the dried product into the pyrolysis and carbonization furnace. It uses indirect heating. The hot air furnace on the side generates high temperature. The temperature is 700℃. The materials in the furnace are in micro-oxygen. Or decompose by heat in an oxygen-free state, the large amount of dry distillation gas produced can be burned through the induced draft fan, and the high-temperature flue gas discharged from the combustion can be pumped to the dryer, saving energy consumption. The output end has a product condensation and collection system. After the product is cooled and collected, a carbonized product with a moisture content of ≤1% can be finally obtained, and a sludge reduction of 93% can be achieved.

Example Embodiment

[0040] Example 3:

[0041] The oily sludge treatment method of this embodiment includes the following steps:

[0042] S1. Take 100L of sludge with a water content of 96.3% and an oil content of 1.8%. Heat the temperature to 70°C, stir and maintain for 20min, and the stirring speed is 120r/min. A large amount of oily matter floats on the water surface. Liquid separation to obtain sludge and oily liquid;

[0043] S2, the oily liquid obtained in step S1 is passed into the sewage treatment system for oil-water separation, and the separated oil is extracted and purified;

[0044] S3. Add medicament to the sludge obtained in step S1 for conditioning. The medicament is cationic polyacrylamide which accounts for 1‰ of the absolute dry weight of the oily sludge, 5% polyferric chloride which accounts for the absolute dry weight of the oily sludge, and the oily sludge. It is compounded with 2% surface active agent of absolute dry weight. After the agent is added, it is stirred at 100r/min. After the reaction is fully stirred for 5 minutes, it is pumped into a horizontal screw centrifuge for mechanical deep dehydration to obtain dehydrated sludge and filtrate. Then perform the operation of step S2;

[0045] S4. The sludge dewatered in step S3 is transported to the drying furnace by a screw conveyor, and it is dispersed and crushed by the built-in stirring device, and dried by hot air drying at a drying temperature of 160°C. After chemicalization, enter the carbonization furnace again for pyrolysis and carbonization treatment at 500°C.

[0046] Among them, the drying treatment can ensure that the quality is uniform in a short time (particle size is 1-5mm) and the moisture content of the dried product is 35%.

[0047] Pyrolysis carbonization treatment, after carbonization, the content of heavy metals and PCB in the product is not detected, and the product no longer has odor and pathogenic bacteria. The toxic and harmful organic matter is fully cracked and converted into elemental carbon, which realizes the safe conversion of toxic and harmful organic pollutants. For safe land use of sludge, the separated water and oily liquid enter the oil-water separator for oil-water separation, and finally obtain an oil recovery rate of 78% through extraction and purification.

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PUM

Property	Measurement	Unit
Particle size	5.0	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple process

Treating method for oily sludge

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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