CN113277597A - Method and device for separating oil-containing wastewater heterojunction microchannel - Google Patents
Method and device for separating oil-containing wastewater heterojunction microchannel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000002351 wastewater Substances 0.000 title claims abstract description 50
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- 238000000926 separation method Methods 0.000 claims abstract description 29
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 12
- 231100000719 pollutant Toxicity 0.000 claims abstract description 12
- 230000008929 regeneration Effects 0.000 claims abstract description 12
- 238000011069 regeneration method Methods 0.000 claims abstract description 12
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- 238000011001 backwashing Methods 0.000 claims abstract description 8
- 238000004581 coalescence Methods 0.000 claims abstract description 7
- 238000003795 desorption Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000005728 strengthening Methods 0.000 claims abstract description 6
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention relates to a method and a device for separating an oily wastewater heterojunction microchannel, and provides a method for separating an oily wastewater heterojunction microchannel, which comprises the following steps: (i) uniformly mixing the medium particles to construct a heterojunction microchannel bed layer; (ii) the separation of suspended substances and oil pollutants in the oily wastewater is realized by the interception, demulsification and coalescence actions of the heterojunction microchannel; and (iii) backwashing the bed layer, and strengthening the desorption of oil and oil sludge on the surfaces of the medium particles through rotational flow autorotation and finally realizing the regeneration of the medium particles of the bed layer. Also provides a micro-channel separation device for the heterojunction of the oily wastewater.
Description
Technical Field
The disclosure belongs to the field of environmental protection, and relates to a physical pretreatment method and a physical pretreatment device for oily wastewater. In particular to a pretreatment method of the oily wastewater generated by the separation and coupling of the heterojunction microchannel and the rotational flow regeneration, and relates to a corresponding matching device for the green treatment of the oily wastewater.
Background
The treatment process of a large amount of oily wastewater exists in the fields of petrochemical industry, coal chemical industry, environmental protection and the like, and the wastewater contains a large number of pollutants, namely oil, suspended matters, bacteria, dissolved organic matters and trace heavy metal elements. At present, a pretreatment combined process of oil separation, flotation and biochemistry is generally adopted for oily wastewater. The pretreatment process mainly removes oil and suspended matters in the incoming water, is the throat of a complete set of sewage treatment process, and directly influences the treatment effect of a biochemical unit.
At present, the ubiquitous problem of oily waste water pretreatment device has: at 500m3The floatation process has the advantages of large medicament cost of about 0.25 yuan/t, large medicament consumption, higher cost and easy secondary pollution; the flotation tank needs aeration, and the discharge amount of VOCs (volatile organic compounds) is 500Nm3The construction structure is large in the operation process, so that the leakage of VOCs is easy to cause; in addition, the flotation scum yield of the flotation tank is about 1000t per year, and a large amount of oily dangerous waste is generated.
Aiming at the main pollutants of oil and suspended matters in the oily wastewater, the conventional treatment methods are gravity settling, centrifugal separation, adsorption, air floatation and the like, and all the treatment methods have the use limitation, and the single use of the treatment methods is often difficult to meet the discharge requirement. With the gradual improvement of environmental protection requirements, the development of integrated coupling technology is developed successively, and researchers at home and abroad have made various works.
US 20120132588a1 discloses a method for treating oily wastewater, which uses electrochemical flocculation and flotation as pretreatment methods, and adopts a membrane distillation method to treat pretreated effluent, wherein the effluent can be used as raw water for generating steam; however, this method has a problem of large energy consumption.
CN104843817B discloses a method and a device for removing oil from a horizontal air flotation coupling corrugated plate, which adopts an optimized combination method of a multilayer inclined plate unit and a horizontal air flotation coupling technology to realize the separation of three phases with high efficiency, rapidness and low energy consumption, and is suitable for the treatment process of oily wastewater such as sewage treatment, crude oil exploitation and the like, however, the treatment process is accompanied with the consumption of medicaments, and the wastewater treatment cost is increased.
CN106007209 discloses a petroleum refining sewage oil removal pretreatment process, which combines mechanical separation, coarse granulation treatment and air floatation technology to realize oil-water separation pretreatment, and adopts physical and chemical methods to act together, so that the oil content in the pretreated oily wastewater is less than or equal to 20mg/L and reaches the national standard. However, the processing mode by multiple technical units in series increases the energy consumption of the processing process and increases the complexity of the process.
The existing pretreatment process of oily wastewater is continuously and deeply researched on a method for reducing the oil content, but an air flotation process is widely used in the pretreatment process, and the air flotation process can consume a large amount of chemical agents and generate scum while effectively removing floating oil, emulsified oil and suspended matters, so that new environmental protection pressure and cost burden are caused. Therefore, there is an urgent need in the art to develop a method and a device which have a short flow path and can realize the emission reduction of the VOCs, the reduction of oil sludge and the removal of emulsified oil.
Disclosure of Invention
The present disclosure provides a new physical pretreatment method and apparatus for oily wastewater, thereby overcoming the defects in the conventional process technology.
In one aspect, the present disclosure provides a method for separating a heterojunction microchannel of oil-containing wastewater, comprising the steps of:
(i) uniformly mixing the medium particles to construct a heterojunction microchannel bed layer;
(ii) the separation of suspended substances and oil pollutants in the oily wastewater is realized by the interception, demulsification and coalescence actions of the heterojunction microchannel; and
(iii) and backwashing the bed layer, and strengthening the desorption of oil and oil sludge on the surface of the medium particles through rotational flow autorotation to finally realize the regeneration of the medium particles of the bed layer.
In a preferred embodiment, the media particles are oleophilic, hydrophobic, and hydrophilic, oleophobic particles having a particle size of 0.5 to 2 mm; the pore diameter of the micro-channel is not higher than 1 μm.
In another preferred embodiment, the heterojunction microchannel bed is constructed by using a heterojunction microchannel separator, the air bed flow rate of the heterojunction microchannel separator is 10-15m/h, the backwashing flow rate is 1.2-1.5 times of the water inlet flow rate, and the backwashing time is 15-30 minutes.
In another preferred embodiment, bed media particle regeneration is performed using a cyclone regenerator at the top of the heterojunction microchannel separator with an inlet water flow rate of <1 m/s.
In another preferred embodiment, when the concentration of the suspended matter in the oily wastewater is not higher than 500mg/L, the concentration of the suspended matter in the effluent is reduced to 30mg/L or less after the interception in the step (ii).
In another preferred embodiment, the concentration of the contaminant in the oily wastewater is reduced to 15mg/L or less after the demulsification in step (ii) when the concentration of the contaminant in the oily wastewater is not higher than 200 mg/L.
In another aspect, the present disclosure provides an oil-containing wastewater heterojunction microchannel separation device, comprising:
the heterojunction microchannel separator is used for performing the steps of (i) uniformly mixing medium particles to construct a heterojunction microchannel bed layer and (ii) realizing the separation of suspended substances and oil pollutants in the oil-containing wastewater by means of the interception, demulsification and coalescence actions of the heterojunction microchannel; and
and (3) a cyclone regenerator positioned at the top of the heterojunction microchannel separator, and used for backwashing the bed layer in the step (iii), and strengthening the desorption of oil and oil sludge on the surface of the medium particles through cyclone autorotation and finally realizing the regeneration of the medium particles of the bed layer.
In a preferred embodiment, the heterojunction microchannel separator has an inlet, an outlet (i.e., a backwash water inlet), and a backwash water outlet.
In another preferred embodiment, the cyclone regenerator is selected from an axial flow type cyclone or a tangential type cyclone.
In another preferred embodiment, the bed of the heterojunction microchannel separator comprises 50-60% of the total capacity of the device; the pressure drop of the heterojunction microchannel separator is not higher than 0.1 MPa.
Has the advantages that:
the invention adopts the heterojunction microchannel separator to realize oil removal and solid removal of oily wastewater, adopts the cyclone regenerator to realize regeneration of bed medium particles and reconstruct the bed particles of the heterojunction microchannel separator so as to replace a conventional air floatation unit, realizes no addition of medicament, no air blowing and no floating slag generation in the pretreatment process of the oily wastewater, and has the advantages of low cost, simple flow, high separation efficiency and the like.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification to further illustrate the disclosure and not limit the disclosure.
Fig. 1 is a schematic illustration of a heterogeneous particle distribution according to a preferred embodiment of the present disclosure.
Figure 2 is a schematic diagram of a heterojunction microchannel separator device according to a preferred embodiment of the present disclosure.
FIG. 3 is a schematic diagram of a heterojunction microchannel emulsified oil demulsification separation according to a preferred embodiment of the present disclosure.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Through extensive and intensive research, the inventor of the application develops a method and a device for demulsifying and removing oil by a heterojunction particle bed layer, which have short flow and can realize the emission reduction of VOCs (volatile organic compounds), oil sludge reduction and emulsified oil removal, has the characteristics of high separation efficiency, simple operation flow and the like, simultaneously takes a physical method as a core, cancels the consumption of a medicament, and realizes the oil-sludge-water three-phase cooperative separation.
In a first aspect of the present disclosure, there is provided an oil-containing wastewater heterojunction microchannel separation method, comprising the steps of:
(i) uniformly mixing oleophylic hydrophobic particles and hydrophilic oleophobic particles, and placing the mixture in a heterojunction microchannel separator to construct a heterojunction microchannel bed layer;
(ii) the separation of suspended substances and oil pollutants in the oily wastewater is realized by the interception, demulsification and coalescence actions of the heterojunction microchannel; and
(iii) and (4) backwashing the bed layer, and strengthening the desorption of oil and oil sludge on the surface of the particles through rotational flow autorotation to finally realize the regeneration of the particles of the bed layer.
In the present disclosure, the media particles are both oleophilic hydrophobic and hydrophilic oleophobic and are uniformly distributed in the separator.
In the present disclosure, the empty bed flow rate of the heterojunction microchannel separator is 10-15 m/h.
In the present disclosure, the backwash flow rate of the heterojunction microchannel separator is 1.2-1.5 times the inlet water flow rate, and the backwash time period is 15-30 minutes (min).
In the present disclosure, the bed particles are regenerated using a cyclone regenerator with a feed water flow rate <1m/s, e.g. 0.4-0.7 m/s.
In the present disclosure, when the concentration of suspended matters in the oily wastewater is not higher than 500mg/L, the step (ii) can effectively intercept suspended matters in the oily wastewater, so that the concentration of suspended matters in the effluent is reduced to below 30 mg/L.
In the present disclosure, when the concentration of the oil pollutants in the oil-containing wastewater is not higher than 200mg/L, the concentration of the oil pollutants is reduced to below 15mg/L after the demulsification and oil removal of the step (ii).
In a second aspect of the present disclosure, there is provided an oil-containing wastewater heterojunction microchannel separation device, comprising:
the heterojunction microchannel separator is used for realizing the cooperative separation of oil, mud and water composite pollutants in the oily wastewater; and
and the cyclone regenerator is positioned at the top of the heterojunction microchannel separator and is used for enhancing the regeneration of the particle medium.
In the present disclosure, the heterojunction microchannel separator has an inlet, an outlet (i.e., a backwash water inlet), and a backwash water outlet.
In the present disclosure, the media particles have a particle size of 0.5-2 mm.
In the present disclosure, the cyclone regenerator is an axial flow or tangential cyclone.
In the present disclosure, the bed of the heterojunction microchannel separator comprises 50-60% of the total capacity of the device.
In the present disclosure, the pressure drop of the heterojunction microchannel separator is not higher than 0.1 MPa.
Reference is made to the accompanying drawings.
Fig. 1 is a schematic illustration of a heterogeneous particle distribution according to a preferred embodiment of the present disclosure. As shown in fig. 1, two kinds of lipophilic and hydrophilic particle media (hydrophilic oleophobic medium and hydrophilic hydrophobic medium) with different properties form a tight bed layer by mutual contact and accumulation, so as to achieve emulsion breaking of emulsified oil and interception of suspended matters.
Figure 2 is a schematic diagram of a heterojunction microchannel separator device according to a preferred embodiment of the present disclosure. As shown in fig. 2, the oily wastewater enters a heterojunction microchannel separator 1, and the synergistic separation of oil, mud and water is realized in the heterojunction microchannel separator 1; after operating for a period of time, regenerating heterogeneous bed layer medium particles, removing pollutants on particle pore passages and surfaces by introducing the bed layer medium particles into a cyclone regenerator 2 (which comprises an underflow outlet 7) arranged at the top of a heterojunction microchannel separator 1, and reconstructing the bed layer particle arrangement of the heterojunction microchannel separator; wherein the heterojunction microchannel separator 1 has an inlet 3 for water inlet, an outlet 4 for water outlet and backwash water inlet (also backwash water inlet), and a backwash water outlet 6 for backwash water outlet (also overflow outlet of the cyclone regenerator).
FIG. 3 is a schematic diagram of a heterojunction microchannel emulsified oil demulsification separation according to a preferred embodiment of the present disclosure. As shown in fig. 3, when the emulsified oil is simultaneously contacted with oleophilic and hydrophilic heterogeneous particles (hydrophilic medium and lipophilic medium), the oil and water are respectively subject to the adsorption force of the heterogeneous medium, and the oil and water separation of the emulsion is realized through the tearing, stripping and coalescence processes.
Examples
The invention is further illustrated below with reference to specific examples. It is to be understood, however, that these examples are illustrative only and are not to be construed as limiting the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the manufacturer. All percentages and parts are by weight unless otherwise indicated.
Example 1:
1. process flow
The embodiment is applied to a pretreatment system of oil-containing wastewater in petroleum refining, the pretreatment process of the existing sewage treatment plant in the base is a combined process of homogenization, oil separation and flotation, the process flow is relatively long, chemical agents need to be continuously added for ensuring the water outlet effect, and the wastewater treatment cost is increased. The method is used for carrying out the heterojunction microchannel separation of the oily wastewater.
The water quality conditions of the oily wastewater used in this example are shown in Table 1 below.
TABLE 1 quality conditions of the incoming water
| COD(mg/L) | NH4-N(mg/L) | Suspended substance (mg/L) | Petroleum products (mg/L) |
| 300-400 | 40-60 | 100-500 | 50-200 |
2. Key equipment
The key equipment in the process flow is a heterojunction microchannel separator, in practical application, different quantities of equipment can be selected in parallel according to different treatment amounts, and all the process key equipment are shell-mounted equipment, so that the transportation and the installation are convenient. In the embodiment, the heterojunction microchannel separator is adopted to treat the petrochemical oily wastewater.
3. Operating parameters
The oil-containing wastewater was subjected to continuous experiments using a heterojunction microchannel separator, and the oil concentration and suspended matter concentration of the inlet water and the outlet water were measured, and the measurement results are shown in table 2 below.
TABLE 2 oil and suspended matter concentrations in and out of water
Through business turn over water quality of water analysis and see, this preprocessing device can effectively separate dispersion, suspension and the emulsified oil in the oily waste water. In addition, in the embodiment, the heterojunction microchannel separator can effectively intercept suspended matters and realize circulation and sealing treatment in the process of enriching and recovering oil sludge in a regeneration mode.
The novel pretreatment method has stable effect of removing suspended matters and petroleum, and the concentration of the petroleum can be basically controlled below 15mg/L as can be seen from the measurement results of the concentration of the petroleum in and out water, so that most of suspended oil and emulsified oil are removed; in addition, the pretreatment method can basically control the concentration of suspended matters to be below 30 mg/L. The oil-sludge-water three-phase synergistic separation method realizes oil-sludge-water three-phase synergistic separation of oily wastewater by means of unit equipment, replaces the medicament consumption in the traditional pretreatment process, synchronously realizes reduction of sludge and VOCs, simplifies the traditional process flow, and is helpful for green development of petrochemical industry.
The above-listed embodiments are merely preferred embodiments of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, all equivalent changes and modifications made according to the contents of the claims of the present application should be considered to be within the technical scope of the present disclosure.
All documents referred to in this disclosure are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes or modifications to the disclosure may be made by those skilled in the art after reading the above teachings of the disclosure, and such equivalents may fall within the scope of the disclosure as defined by the appended claims.
Claims (10)
1. A method for separating an oil-containing wastewater heterojunction microchannel comprises the following steps:
(i) uniformly mixing the medium particles to construct a heterojunction microchannel bed layer;
(ii) the separation of suspended substances and oil pollutants in the oily wastewater is realized by the interception, demulsification and coalescence actions of the heterojunction microchannel; and
(iii) and backwashing the bed layer, and strengthening the desorption of oil and oil sludge on the surface of the medium particles through rotational flow autorotation to finally realize the regeneration of the medium particles of the bed layer.
2. The method of claim 1, wherein the media particles are oleophilic hydrophobic and hydrophilic oleophobic particles having a particle size of 0.5 mm to 2 mm; the pore diameter of the micro-channel is not higher than 1 μm.
3. The method of claim 1, wherein the heterojunction microchannel bed is constructed using a heterojunction microchannel separator having an empty bed flow rate of 10 to 15m/h, a backwash flow rate of 1.2 to 1.5 times the feed flow rate, and a backwash time period of 15 to 30 minutes.
4. The method of claim 3, wherein bed media particle regeneration is performed using a cyclone regenerator at the top of the heterojunction microchannel separator, the cyclone regenerator having an inlet water flow rate of <1 m/s.
5. The method of claim 1, wherein when the concentration of the suspension in the oily wastewater is not higher than 500mg/L, the concentration of the suspension in the effluent is reduced to 30mg/L or less after the interception in step (ii).
6. The method of claim 1, wherein the concentration of the contaminant in the oily wastewater is reduced to 15mg/L or less after the demulsification in step (ii) when the concentration of the contaminant in the oily wastewater is not higher than 200 mg/L.
7. A heterogeneous micro-channel separation device for oily wastewater, which comprises:
the heterojunction microchannel separator (1) is used for performing the steps of (i) uniformly mixing medium particles to construct a heterojunction microchannel bed layer and (ii) realizing the separation of suspended substances and oil pollutants in the oil-containing wastewater by means of the interception, demulsification and coalescence of the heterojunction microchannel; and
and (3) a cyclone regenerator (2) positioned at the top of the heterojunction microchannel separator (1) and used for backwashing the bed layer in the step (iii), and strengthening the desorption of oil and oil sludge on the surface of the medium particles through cyclone autorotation and finally realizing the regeneration of the medium particles of the bed layer.
8. The device according to claim 7, wherein the heterojunction microchannel separator (1) has an inlet (3), an outlet (4) and a backwash water outlet (6), wherein the outlet (4) is also a backwash water inlet.
9. The apparatus according to claim 7, characterized in that the cyclone regenerator (2) is selected from an axial or tangential cyclone.
10. The device according to claim 7, wherein the bed of the heterojunction microchannel separator (1) represents 50-60% of the total volume of the device; the pressure drop of the heterojunction microchannel separator (1) is not higher than 0.1 MPa.
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Cited By (1)
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| CN115180744A (en) * | 2022-08-11 | 2022-10-14 | 华东理工大学 | Cross-flow nanofiltration microchannel separator and application thereof |
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Application publication date: 20210820 |