CN217265347U - Oily sludge harmless treatment and resource utilization system - Google Patents
Oily sludge harmless treatment and resource utilization system Download PDFInfo
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- CN217265347U CN217265347U CN202220679119.6U CN202220679119U CN217265347U CN 217265347 U CN217265347 U CN 217265347U CN 202220679119 U CN202220679119 U CN 202220679119U CN 217265347 U CN217265347 U CN 217265347U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
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Abstract
The utility model discloses an oily sludge harmless treatment and resource utilization system, which comprises an aerobic tank, an air flotation device, a chemical oxidation device, a dehydration device and a heat treatment device which are connected in sequence; the oily sludge harmless treatment and resource utilization system also comprises a wastewater treatment system; the air floatation device and the dehydration device are respectively connected with the wastewater treatment system. The utility model discloses an oily sludge innocent treatment and resource utilization system can be applied to high oiliness, high salt environment, realizes fatlute innocent treatment and petroleum resource's recovery, and the operation is stable, easy and simple to handle, capital construction investment cost is low.
Description
Technical Field
The utility model relates to a solid waste technical field, concretely relates to oily sludge innocent treatment and resource utilization system.
Background
The oily sludge is a solid or semi-solid stable emulsion system composed of petroleum hydrocarbon, water, solid particles and other substances (such as heavy metals), and mainly comes from the processes of crude oil exploitation, oil and gas storage and transportation, crude oil storage in an oil refinery and sewage treatment. The oil sludge contains a large amount of crude oil, wax, asphaltene, colloid and other substances, and also contains benzene series, phenols, anthracene, pyrene and other toxic and harmful substances, and most of the harmful microorganisms symbiotic in the sludge are pathogenic bacteria. Because the oil sludge has complex components, high dehydration difficulty, flammable and explosive substances and the like, the selection of the treatment process needs to be careful.
At present, oil-containing sludge treatment at home and abroad can be roughly divided into physical treatment, chemical treatment and biological treatment technologies. Physical treatment technologies such as flotation technology, conditioning-mechanical separation technology, ultrasonic/microwave technology and the like can only primarily realize the separation of oil and mud, and if no pretreatment is available, the separation effect is not ideal; the quenching and tempering-mechanical separation technology and the ultrasonic wave/microwave technology are complex to operate, have high requirements on equipment precision and have long treatment period. Chemical treatment technologies such as incineration technology, chemical hot washing/demulsification method, wet oxidation method and the like, although the incineration technology can rapidly and thoroughly remove petroleum hydrocarbons in the oily sludge, the investment and operation cost is high; the chemical hot washing/demulsification method and the wet oxidation method need to add a large amount of chemical agents or invest high operation cost, and have the problem of corrosion of a reaction vessel; the traditional biological methods such as microbial treatment technology have long treatment period, are greatly influenced by the environment and are difficult to recover petroleum.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem that prior art exists unable effective innocent treatment oily sludge, the utility model aims to provide an oily sludge innocent treatment and resource utilization system.
In order to realize the purpose, the utility model adopts the technical scheme that:
a system for harmless treatment and resource utilization of oily sludge comprises an aerobic tank, an air flotation device, a chemical oxidation device, a dehydration device and a heat treatment device which are sequentially connected; the oily sludge harmless treatment and resource utilization system also comprises a wastewater treatment system; the air floatation device and the dehydration device are respectively connected with the wastewater treatment system.
Preferably, in the oily sludge harmless treatment and resource utilization system, a return pipeline is arranged between the air floatation device and the aerobic tank; the backflow pipeline is used for refluxing the oily mud water of the air floatation device to the aerobic tank.
Preferably, the oil-containing sludge harmless treatment and resource utilization system also comprises an oil residue recovery tank; the oil residue recovery tank is connected with the air floatation device; a gas dissolving system of the air floating device generates a large amount of micro bubbles, so that the highly dispersed micro bubbles are mixed with an oil layer to form oil droplets with density smaller than that of water, and the oil droplets float on the water surface, and finally, the three-phase separation of oil, mud and water is realized; and after being cleaned by a slag scraper, the oil residue on the water surface is collected into an oil residue recovery tank.
Preferably, the oil-containing sludge harmless treatment and resource utilization system also comprises a dosing device; the dosing equipment is connected with the chemical oxidation device; the chemical adding equipment is used for adding an oxidant into the chemical oxidation device; the chemical agent prepared in the dosing equipment is persulfate solution.
Preferably, in the oily sludge harmless treatment and resource utilization system, a stirring device is arranged in the chemical oxidation device; the chemical oxidation device adopts a stirring mode to mix reactants, thereby improving the mass transfer effect and the oxidation reaction rate.
Preferably, in the oil-containing sludge harmless treatment and resource utilization system, a steam conveying pipeline is arranged between the heat treatment device and the chemical oxidation device; the chemical oxidation device adopts an indirect heating mode, and high-temperature steam generated by the heat treatment device is conveyed to the chemical oxidation device through a steam conveying pipeline for heating in the chemical oxidation process; the chemical oxidation device keeps an air-isolated and closed state, an indirect heating mode is adopted in the reaction process, free radicals are generated through reaction, and the free radicals have extremely strong oxidability and can effectively decompose organic pollutants, so that petroleum hydrocarbon in the oil sludge is further converted into substances with no toxicity or relatively low toxicity.
Preferably, the oil-containing sludge harmless treatment and resource utilization system also comprises a condensing device; the chemical oxidation device is connected with the condensing device; high-temperature steam generated by the heat treatment device is used for heating the chemical oxidation device, and then enters the condensation device.
Further preferably, in the oily sludge harmless treatment and resource utilization system, a filtering device is arranged between the condensing device and the heat treatment device; the condensing device generates non-condensable gas and a condensed oil-water mixture, and the non-condensable gas enters the filtering device; the non-condensable gas enters the heat treatment device after impurities are removed through the filtering device, and is used for heating by heat generated by the heat treatment device.
Preferably, the oily sludge harmless treatment and resource utilization system comprises a wastewater treatment system, a coagulation sedimentation zone and a Fenton reaction zone; the air flotation device and the dehydration device are respectively connected with the coagulating sedimentation area; the Fenton reaction zone is connected with the aerobic tank; the middle layer of the air flotation device clarifies oily wastewater and liquid generated by the dewatering device enters a coagulating sedimentation area of the wastewater treatment system, and after coagulating sedimentation and Fenton oxidation treatment are sequentially carried out in the wastewater treatment system, part of the effluent of the Fenton reaction area flows back into the aerobic tank.
Preferably, the oil-containing sludge harmless treatment and resource utilization system also comprises a waste gas treatment device; the waste gas treatment device is respectively connected with the aerobic tank, the air floatation device and the dehydration device; and the waste gas treatment device is introduced with spraying liquid to carry out spraying treatment on the waste gas, and the waste gas is discharged after purification treatment.
The utility model has the advantages that:
the utility model discloses a oiliness mud innocent treatment and utilization system can be applied to high oiliness, high salt environment, realizes fatlute innocent treatment and petroleum resource's recovery, and the operation is stable, easy and simple to handle, capital construction investment cost is low.
Use the utility model discloses an oily sludge innocent treatment and resource utilization system handle oily sludge, and oil is got rid of efficiently, the environmental tolerance is good.
Drawings
FIG. 1 shows the harmless treatment and resource utilization system for oily sludge of the present invention.
FIG. 2 is a system for harmless treatment and resource utilization of oily sludge according to an embodiment.
Shown in figures 1-2:
100-an aerobic tank, 200-an air flotation device, 300-a chemical oxidation device, 400-a dehydration device, 500-a heat treatment device, 600-a wastewater treatment system, 610-a coagulating sedimentation area, 620-a Fenton reaction area, 700-an oil residue recovery tank, 800-a dosing device, 900-a condensation device and 1000-a filtering device.
Detailed Description
The embodiments of the present invention will be described in detail below, and the embodiments described with reference to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
The present invention will be described in further detail with reference to specific examples.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be directly connected to each other, indirectly connected to each other through an intermediate member, or connected to each other through the inside of two members. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The starting materials, reagents or equipment used in the examples are, unless otherwise specified, either conventionally commercially available or may be obtained by methods known in the art. Unless otherwise indicated, the testing or testing methods are conventional in the art.
As shown in fig. 1, the system for harmless treatment and resource utilization of oily sludge comprises an aerobic tank 100, an air flotation device 200, a chemical oxidation device 300, a dehydration device 400 and a heat treatment device 500 which are connected in sequence; the system also includes a wastewater treatment system 600; the air flotation device 200 and the dehydration device 400 are respectively connected with the wastewater treatment system 600.
The harmless treatment and resource utilization system for the oily sludge according to the embodiment of the present invention is described below with reference to fig. 2.
As shown in fig. 2, the oily sludge harmless and resource utilization system according to the embodiment of the present invention comprises an aerobic tank 100, an air flotation device 200, a chemical oxidation device 300, a dehydration device 400, a heat treatment device 500, a wastewater treatment system 600, an oil residue recovery tank 700, a dosing device 800, a condensation device 900, and a filtering device 1000.
The utility model discloses oily sludge innoxious and utilization system, effluent disposal system 600 includes coagulating sedimentation district 610, fenton reaction area 620.
As shown in fig. 2, in an embodiment of the system for harmless and recycling of oily sludge, the aerobic tank 100, the air flotation device 200, the chemical oxidation device 300, the dehydration device 400, and the heat treatment device 500 are sequentially connected, the oil residue recovery tank 700 is connected to the air flotation device 200, the chemical dosing device 800 is connected to the chemical oxidation device 300, and the chemical oxidation device 300 is connected to the condensation device 900, the filtration device 1000, and the heat treatment device 500.
As shown in fig. 2, in some embodiments of the present invention, the oily sludge enters the aerobic tank 100 for aerobic treatment, the oily sludge and water enter the air flotation device 200 after the aerobic treatment, after the air flotation treatment, the oil droplets with density less than water float on the water surface, the oil residue on the water surface is collected in the oil residue recovery tank 700, the part of the oily sludge and water in the air flotation device 200 flows back to the aerobic tank 100, the bottom sludge at the bottom of the air flotation device 700 enters the chemical oxidation device 300, the chemical adding device 800 adds an oxidant to the chemical oxidation device 300, and the oxidant is persulfate; the oily sludge after the chemical oxidation treatment enters a dehydration device 400 for dehydration; the dehydrated oily sludge enters a heat treatment device 500, hot steam is adopted to heat the oily sludge, and the oily sludge after heat treatment is discharged to realize harmless treatment; the hot steam after the heat treatment device 500 enters the chemical oxidation device 300 to indirectly heat the chemical oxidation device 300, the steam after the treatment of the chemical oxidation device 300 enters the condensation device 900 to be condensed to obtain non-condensable gas and condensed oil and water, and the non-condensable gas enters the filtering device 1000 to further remove impurities and then enters the heat treatment device 500 to serve as a heat source for heat treatment.
Application examples
The method is characterized in that the tank cleaning oil sludge and the ground oil sludge of a certain branch of China and petrochemical companies are taken as treatment objects, the oil content of the mixed sludge of the tank cleaning oil sludge and the ground oil sludge is preliminarily determined to be 25% -35%, and the salinity of the mixed liquid is 10% -25% after the mixed sludge is mixed with clean water/reuse water according to the proportion of 1: 3.
Taking 2t of oily sludge after removing large impurities and homogenizing, uniformly mixing the oily sludge and clean water/recycled water according to a volume ratio of 1:3 in an aerobic pool, adding marine petroleum tolerant bacteria according to 10% of the volume of the treated oil sludge, wherein the marine petroleum tolerant bacteria mainly comprise Acinetobacter viniferus, Bacillus pumilus, mycobacterium hydroboracium, and alkane-eating bacteria Alcanivorax, the marine petroleum tolerant bacteria are purchased to a China marine microbial strain preservation management center (MCCC), MLSS in the aerobic pool is controlled to be 0.5-1.0g/L, the pH value in the aerobic treatment process is stabilized to be 7-8, the water temperature is controlled to be 38-45 ℃, DO is controlled to be 2.0-2.5mg/L, the retention time of the oily sludge is 72h, and after biological treatment, the oil content of the oily sludge is reduced from about 25% -35% to 15%.
And (3) conveying the oily sludge treated by the aerobic tank to an air floatation device, and performing partial reflux dissolved air floatation, wherein the diameter of bubbles is 20-30 mu m, the total retention time is 40min, and PAC and PAM can be added if necessary. The gas dissolving system generates micro-bubbles and oilThe layers are mixed to form oil droplets with density less than that of water, and the oil droplets float on the water surface, so that three-phase separation of oil, mud and water is finally realized. After being cleaned by a slag scraper, the oil residue on the water surface is collected to an oil residue recovery tank through a slag discharge groove, and the recovery amount is about 0.48 t; the clear liquid (oily wastewater) in the middle layer is conveyed to a wastewater treatment system, and the conveying capacity is about 6.5m 3 (ii) a The oil-containing sludge water at the bottom partially reflows to the aerobic tank through a sludge pump, the reflow ratio is 20-30%, and the oil content of the oil-containing sludge is reduced to about 10% after air flotation treatment. The method comprises the following steps that (1) oily sludge water at the bottom enters a chemical oxidation device, a medicine adding device adds a sodium persulfate oxidant into the chemical oxidation device, a stirring device is arranged in the chemical oxidation device for stirring, and the temperature of the chemical oxidation device is kept at 50-60 ℃; discharging the sludge from the chemical oxidation device, feeding the sludge into a dehydration device, and adopting a centrifugal dehydration device, wherein the rotating speed of the centrifugal dehydration device is 2500r/min, and the water content in the dehydrated sludge is less than or equal to 70%; the dewatered sludge enters a heat treatment device, the temperature of the heat treatment device is 200-300 ℃, the treatment time is 4h, the total oil content of the sludge is determined to be less than or equal to 0.5 percent after heat treatment, the requirements related to the soil pollution risk control standards (trial) for soil environmental quality construction land (GB36600-2018) are met, and the dewatered sludge can be used as building materials. High-temperature steam generated by the heat treatment device is conveyed to the chemical oxidation device through a steam conveying pipeline and is used for heating the chemical oxidation device, the steam after heat exchange enters a condensing device for condensation treatment to obtain condensed oil-water and non-condensable gas, and the condensed oil-water is separated and recovered to obtain oil; the non-condensable gas enters a filtering device to remove impurities and is used for the heat treatment to be reused as auxiliary fuel.
Oily wastewater generated by an air flotation device and a dehydration device enters a wastewater treatment system, and a coagulant in a coagulation and precipitation area of the wastewater treatment system is Polyferric (PAFC), and the adding amount is 250 mg/L; the flocculating agent adopts Polyacrylamide (PAM) and 0.2 wt% of anionic PAM, and the adding amount is 10 mg/L; and in the coagulating sedimentation process, the pH value is maintained at 6.8-7.8, the pH value is adjusted by adopting 30 wt% of NaOH, and sedimentation is carried out after coagulating treatment, wherein the sedimentation time is 4 h. The effluent of the coagulating sedimentation zone enters a Fenton reaction zone, 27.5 wt% of hydrogen peroxide is adopted in the Fenton reaction zone, the molar ratio of ferrous iron to the hydrogen peroxide is 1:6, and the adding amount of the hydrogen peroxide and the COD (chemical oxygen demand) are cr The molar ratio of (1.43: 1), the pH value of the Fenton reaction zone is kept between 3.0 and 3.5, the pH value can be adjusted by adopting 98 weight percent concentrated sulfuric acid, and the hydraulic retention time of the Fenton treatment is between 4 and 8 hours. After passing through the wastewater treatment system, 60 percent of wastewater flows back to the aerobic treatment unit, and 40 percent of wastewater reaches the standard and is discharged to a sewage pipe network.
The operation cost is as follows: taking the oil sludge treatment capacity of 2 t/day as an example, the comprehensive treatment cost is 190 yuan/ton of oil sludge, and comprises microbial inoculum cost, medicament cost, low-temperature heat treatment, water and electricity consumption and the like. The total equipment investment is about 52 ten thousand yuan, and comprises an aerobic tank, an air floatation device, a chemical oxidation device, a dehydration device, a heat treatment device, a wastewater treatment device, a corresponding pump and a corresponding meter. Adopt the utility model discloses an oily sludge innocent treatment and utilization system handles oily sludge, and capital construction investment cost is low, equipment input cost is few, and subsequent running cost is low.
Claims (9)
1. A system for harmless treatment and resource utilization of oily sludge is characterized by comprising an aerobic tank, an air flotation device, a chemical oxidation device, a dehydration device and a heat treatment device which are sequentially connected; the oily sludge harmless treatment and resource utilization system also comprises a wastewater treatment system; the air flotation device and the dehydration device are respectively connected with the wastewater treatment system.
2. The system for harmless treatment and resource utilization of oily sludge according to claim 1, wherein a return pipeline is arranged between the air flotation device and the aerobic tank.
3. The system for harmless treatment and resource utilization of oily sludge according to claim 2, further comprising an oil residue recovery tank; the oil residue recovery tank is connected with the air floatation device.
4. The oily sludge harmless treatment and resource utilization system according to claim 1, further comprising a dosing device; the dosing equipment is connected with the chemical oxidation device.
5. The system for harmless treatment and resource utilization of oily sludge according to claim 1, wherein a stirring device is arranged in the chemical oxidation device.
6. The system for harmless treatment and resource utilization of oily sludge according to claim 1, wherein a steam delivery pipeline is arranged between the heat treatment device and the chemical oxidation device.
7. The system for harmless treatment and resource utilization of oily sludge according to claim 6, further comprising a condensing device; the chemical oxidation device is connected with the condensing device.
8. The system for harmless treatment and resource utilization of oily sludge according to claim 7, wherein a filtering device is arranged between the condensing device and the heat treatment device.
9. The system for harmless treatment and resource utilization of oily sludge according to claim 1, wherein the wastewater treatment system comprises a coagulating sedimentation zone and a Fenton reaction zone; the air floatation device and the dehydration device are respectively connected with the coagulating sedimentation area; the Fenton reaction zone is connected with the aerobic tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521034A (en) * | 2022-10-28 | 2022-12-27 | 中南大学 | Remediation method for harmless combined treatment of oily sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521034A (en) * | 2022-10-28 | 2022-12-27 | 中南大学 | Remediation method for harmless combined treatment of oily sludge |
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