CN108191179B - Washing treatment method for chemical oily sludge soil - Google Patents

Washing treatment method for chemical oily sludge soil Download PDF

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Publication number
CN108191179B
CN108191179B CN201711470025.8A CN201711470025A CN108191179B CN 108191179 B CN108191179 B CN 108191179B CN 201711470025 A CN201711470025 A CN 201711470025A CN 108191179 B CN108191179 B CN 108191179B
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washing
solid
oil
phase
separation
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CN108191179A (en
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郑搏英
吴小亮
吕伏建
江海云
吴晓瑶
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Zhejiang Qi Cai Eco Technology Co ltd
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Zhejiang Qi Cai Eco Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/002Sludge treatment using liquids immiscible with water
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor

Abstract

The invention discloses a washing treatment method of chemical oil-containing sludge soil, which belongs to the technical field of environmental remediation and comprises the following steps of ① solvent oil extraction washing, wherein the solvent oil is adopted to extract and wash the oil-containing sludge soil, solid-liquid phase separation is carried out after washing, liquid phase is kept and used mechanically, ② agent washing, solid-phase oil sludge obtained after solid-liquid separation in the step ① is washed by agent washing liquid, solid-liquid separation is carried out after washing, ③ clear water washing, the solid-phase oil sludge obtained after solid-liquid separation in the step ② is added with water to be washed, and three-phase separation of oil, water and mud is carried out after washing, so that the treated soil is obtained.

Description

Washing treatment method for chemical oily sludge soil
Technical Field
The invention relates to the technical field of environment, in particular to a washing treatment method of chemical oily sludge soil.
Background
The treatment of chemical oil sludge mostly adopts the methods of stacking storage and landfill treatment or adopts the methods of pyrolysis and incineration.
The landfill treatment method has limited treatment amount and large investment cost, and the percolate seriously pollutes underground water and surface water; the thermal cracking and incineration technology, for example, the chinese patent application publication No. CN 103058483 a, discloses a method for treating oil sludge, which is used for treating oil-containing silt generated in oil production in oil fields, and has the disadvantages of high engineering investment and operation cost, low energy utilization rate, excessive consumption, and large amount of secondary pollution such as nitrogen and sulfide generated in the operation process.
The chemical oil-containing sludge soil contains more alkanes, naphthenes and aromatic oil components and non-hydrocarbon sulfur nitride, and is tightly coated with an earth phase, the conventional medicament washing cannot achieve oil-sludge two-phase separation, and meanwhile, excessive toxic and harmful chemical substances contained cannot be effectively treated, so that the environment is seriously polluted and damaged.
For the problems, some units have made corresponding efforts, for example, a Chinese patent with application publication number of CN 104876405A discloses a cleaning method of aged oil sludge, and a cleaning agent prepared by compounding a biological surfactant rhamnolipid, a chemical surfactant TX-100 and an auxiliary agent sodium nonahydrate is adopted to clean the aged oil sludge, so that a good elution effect is obtained; also, for example, the chinese patent with application publication No. CN 104609682 a discloses a method for treating tank bottom oil sludge, which uses 120 # solvent oil as an extractant to perform extraction washing on the tank bottom oil sludge, and uses seawater and a nonionic surfactant or performs secondary washing to obtain a better washing effect,
compared with the washing treatment of petroleum oil sludge, the oil separation treatment of the oil-containing sludge soil in the steel smelting chemical industry is more difficult, the components of the oil separation treatment are complex, the oil separation treatment contains various light and heavy oil components which are difficult to treat, and also contains various chemical substances which have high toxicity and emit foul smell, and at present, the oil-containing sludge soil in the steel smelting process has a case of immature engineering washing treatment.
Disclosure of Invention
Aiming at the technical problems, the washing treatment method of the chemical oily sludge soil is suitable for washing and repairing the chemical oily sludge, is particularly suitable for treating the oily sludge soil in the steel smelting industry, adopts a plurality of technologies to carry out combined cycle treatment, can effectively control the cost on the premise of ensuring the effect, and can reduce the oil content in the chemical oily sludge soil to the maximum extent.
In order to achieve the purpose, the invention designs a washing treatment method of chemical oil-containing sludge soil, which comprises the following steps:
① solvent oil extraction washing, namely extracting and washing the oil-containing sludge soil by using the solvent oil, and performing solid-liquid phase separation after washing, wherein the liquid phase is reserved and used;
②, washing with a medicament, namely washing the solid-phase oil sludge subjected to solid-liquid separation in the step ① with a medicament washing liquid, and performing solid-liquid separation after washing, wherein the liquid phase is reserved and used;
③, washing with clean water, namely adding water into the solid-phase oil sludge subjected to solid-liquid separation in the step ② for washing, and performing oil-water-sludge three-phase separation after washing to obtain the treated soil.
Preferably, the solvent oil used in step ① is a high boiling point solvent oil.
The boiling range of the high-boiling solvent oil is 140-200 ℃, and the high-boiling solvent oil comprises D80 solvent oil, D100 solvent oil, D130 solvent oil, No. 260 solvent oil and the like.
Preferably, in the step ①, the washing is performed under a condition of adding 1.5 to 2.5 times the mass of the solvent oil to the oil-containing sludge soil and washing the mixture for 60 minutes or longer under stirring.
The stirring device is an electric stirrer.
①, adopting light solvent oil which is easy to be processed to fully dissolve out the components such as alkane and arene which are difficult to be washed and have toxicity in the oil-containing sludge soil, and the separated liquid phase can be recycled after being reserved and reused and then being rectified.
Preferably, the lotion used in step ② is composed of a coagent, a surfactant and a demulsifier, and the mass ratio of the coagent to the surfactant to the demulsifier is 1 (0.1-10) to 0.1-10.
Preferably, the active assistant at least comprises sodium silicate, sodium pyrophosphate and sodium chloride, the surfactant at least comprises glycerol random polyether, methylene bis (methyl naphthalene) sodium sulfonate and methylene bis (naphthalene) sodium sulfonate, and the demulsifier at least comprises PPG type polyurethane crude oil demulsifier and SAE type polymethylphenyl silicone oil-polyoxypropylene polyoxyethylene ether.
The formula of the agent lotion comprises specific auxiliary agents, emulsifiers and demulsifiers, has strong pertinence to the treatment of chemical oil-containing sludge soil, has wider treatment range of effective components and more stable effect, can effectively separate oil components, can better react excessive high-toxicity and malodorous complex chemical substances contained in the oil components, and solves the problem of application limitation of biosurfactant.
Preferably, in the above aspect, the washing in step ② is carried out under conditions in which a chemical washing reagent in an amount of 3 to 5 times the mass of the solid phase after solid-liquid separation in step ① is added and the mixture is washed at 70 to 90 ℃ for 60 minutes or longer with stirring.
The scheme adopts a water bath for heat preservation.
Step ②, the mixed components of the light and heavy oil remained in the sludge soil are fully washed and dissolved, and simultaneously, the high-toxicity and malodorous chemical substances with complex components in the sludge soil are treated.
Preferably, in the step ③, the solid phase after the solid-liquid separation in the step ② is washed for 60 minutes or more by adding water in an amount of 3 to 5 times the mass of the solid phase, and then stripping the solid phase sludge by air floatation at a temperature of 70 to 90 ℃ under stirring.
In step ②, the protocol is incubated with a water bath.
The clean water cleaning and the mechanical separation are cooperated for treatment in the step ③, so that the residual oil content in the oil sludge can be effectively separated, and the oil content in the chemical oil-containing sludge soil can be reduced to the maximum extent.
Preferably, in the above-mentioned embodiment, the solid-liquid separation means in step ① is filtration or centrifugation.
Preferably, in the above-mentioned embodiment, the solid-liquid separation means in step ② is filtration or centrifugation.
Preferably, the three-phase separation means in step ③ is centrifugal separation under the condition of 1800-2200 r/min for 5-15 min in a centrifuge.
Step ③ utilizes the characteristics of oil-water density difference and oil-water incompatibility in the sludge soil washing process to make the oil-mud slurry form local vortex, zigzag collision or use narrow channel to catch, gather and merge fine oil drops in the separation equipment, increase the particle size of the oil drops, reduce the retention time, thereby achieving the purpose of oil-water-solid three-phase separation.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the washing treatment method for the chemical oil-containing sludge soil, the light solvent oil is used for extracting and washing the chemical sludge soil, heavy oil content which is difficult to separate in the sludge soil can be effectively removed, the formula agent is combined for washing treatment, the oil content is separated, excessive harmful chemical substances in the soil are effectively removed, repeated washing can be achieved in two steps, cost can be effectively controlled on the premise of ensuring the effect, and the oil content in the chemical oil-containing sludge soil is reduced to the maximum extent.
Detailed Description
The present invention will be described in further detail with reference to specific examples below:
examples 1-4 used the steps of:
①, solvent oil extraction washing, namely, extracting and washing the oily sludge soil by using solvent oil, performing solid-liquid phase separation after washing, and reserving and using a liquid phase, wherein the solvent oil used in the examples 1 to 4 is D80 solvent oil, D100 solvent oil, D130 solvent oil and No. 260 solvent oil respectively;
②, washing with chemicals, namely washing the solid-phase oil sludge subjected to solid-liquid separation in the step ① with a chemical washing liquid, and performing solid-liquid separation after washing;
③, washing with clean water, namely adding water into the solid-phase oil sludge subjected to solid-liquid separation in the step ② for washing, and performing oil-water-sludge three-phase separation after washing to obtain the treated soil.
The parameters and effects of the cleaning method are shown in tables 1 to 3 respectively:
TABLE 1 amounts of solvent oil, chemical wash solution and water and chemical wash solution ratios used in examples 1 to 4
TABLE 2 compositions of lotions used with drugs in examples 1 to 4
TABLE 3 washing parameters in examples 1 to 4
As can be seen from Table 3, the effect of the method for washing the chemical oil-containing sludge soil can reach more than 90 percent after treatment, and the method adopts the circular operation, reduces the operation cost and is particularly suitable for treating the oil-containing sludge soil generated in the steel smelting production process.

Claims (3)

1. A washing treatment method of chemical oil-containing sludge soil is characterized by comprising the following steps:
① extracting and washing with solvent oil, namely extracting and washing the oil-containing sludge soil with high-boiling point solvent oil, and separating solid from liquid after washing, wherein the solid-liquid separation means is filtration separation or centrifugal separation, and the liquid phase is reserved for use;
②, washing a medicament, namely washing solid-phase oil sludge subjected to solid-liquid separation in the step ① by using a medicament washing liquid, performing solid-liquid separation after washing, wherein the solid-liquid separation means is filtration separation or centrifugal separation, the liquid phase is reserved for use, the medicament washing liquid consists of an active assistant, a surfactant and a demulsifier, the mass ratio of the active assistant to the demulsifier is 1 (0.1-10) to (0.1-10), the active assistant at least comprises sodium silicate, sodium pyrophosphate and sodium chloride, the surfactant at least comprises glycerol random polyether, sodium methylene dinaphthalene sulfonate and sodium methylene dinaphthalene sulfonate, and the demulsifier at least comprises a PPG type crude polyurethane oil demulsifier and SAE type polymethylphenyl silicone oil-polyoxypropylene polyoxyethylene ether;
③, washing with clear water, namely adding water into the solid-phase oil sludge subjected to solid-liquid separation in the step ② for washing, wherein the washing conditions are that water with the mass being 3-5 times that of the solid-phase oil sludge subjected to solid-liquid separation in the step ② is added into the solid phase subjected to solid-liquid separation, air floatation is matched to carry out air stripping on the solid-phase oil sludge under the conditions of temperature of 70-90 ℃ and stirring, the solid-phase oil sludge is washed for more than 60 minutes, three-phase separation of oil, water and mud is carried out after washing, the three-phase separation means is centrifugal separation, and the centrifugal conditions are that separation is carried out in a centrifugal machine at the rotating speed of 1800-2200 r/.
2. The method according to claim 1, wherein the washing in step ① is carried out by adding solvent oil in an amount of 1.5-2.5 times the mass of the oily sludge soil, and washing for 60 minutes or longer under stirring.
3. The method according to claim 1, wherein the washing in step ② is carried out under conditions such that 3 to 5 times the mass of a chemical washing solution is added to the solid phase after solid-liquid separation in step ①, and the solid phase is washed at 70 to 90 ℃ for 60 minutes or longer with stirring.
CN201711470025.8A 2017-12-29 2017-12-29 Washing treatment method for chemical oily sludge soil Active CN108191179B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108862935A (en) * 2018-08-10 2018-11-23 浙江奇彩环境科技股份有限公司 Oil-refining chemical wastewater treatment method
CN110563295A (en) * 2019-09-27 2019-12-13 中国科学院新疆理化技术研究所 Method for efficiently treating tank bottom oil sludge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4238280A1 (en) * 1992-11-13 1994-05-19 Basf Ag Deoiling of metal sludges, esp mill scale - by extraction with water contg nonionic surfactant
CN102276069A (en) * 2011-05-06 2011-12-14 河北科技大学 Reinjection water treatment agent for oil well
CN104609682A (en) * 2013-11-04 2015-05-13 浙江海洋学院 Tank body oil sludge treatment method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4238280A1 (en) * 1992-11-13 1994-05-19 Basf Ag Deoiling of metal sludges, esp mill scale - by extraction with water contg nonionic surfactant
CN102276069A (en) * 2011-05-06 2011-12-14 河北科技大学 Reinjection water treatment agent for oil well
CN104609682A (en) * 2013-11-04 2015-05-13 浙江海洋学院 Tank body oil sludge treatment method

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