CN204529576U - A kind of process recovery system of organic high-salt wastewater - Google Patents
A kind of process recovery system of organic high-salt wastewater Download PDFInfo
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- CN204529576U CN204529576U CN201520152796.2U CN201520152796U CN204529576U CN 204529576 U CN204529576 U CN 204529576U CN 201520152796 U CN201520152796 U CN 201520152796U CN 204529576 U CN204529576 U CN 204529576U
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Abstract
The utility model discloses a kind of process recovery system of organic high-salt wastewater, involving vibrations formula membrane filter unit, the vibration-type membrane upgrading unit be connected with the water outlet of described vibrating membrane filtration unit and the MVR evaporation element be connected with the water outlet of described vibration-type membrane upgrading unit.Its treatment step comprises: 1) carry out vibrating membrane filtration process to organic high-salt wastewater, to remove the heavy COD component in waste water; 2) vibration-type membrane concentration is carried out to the water outlet after vibrating membrane filtration process; 3) concentrated solution after vibration-type membrane concentration enters into MVR evaporation element and carries out evaporative crystallization process, is separated the salt produced and reclaims, and being separated the water produced can directly outer row or reuse.System of the present utility model can according to the molecular weight of COD component in waste water and aggregate distribution, take different waste water filterings and concentration formats, under the synergy of machinery and ultrasonic wave two kinds of vibration modes, realize effective process of organic high-salt wastewater, and the work-ing life of membrane module can be significantly improved.
Description
Technical field
The utility model relates to a kind of wastewater processing technology, is specifically related to a kind of process recovery system of organic high-salt wastewater, belongs to environment-protective water process field.
Background technology
In the exploitation that high-salt wastewater is extensively present in Chemical Manufacture and fuel-firing gas-firing resource and the course of processing.The saltiness of high-salt wastewater is greater than 1% usually, and comprises multiple organic impurity, as light constituent organic impurity and heavy constituent organic impurity etc., as not treated direct discharge, will cause severe contamination to ecotope.
At present, comprise for the treatment process that high-salt wastewater is the most frequently used: multistage evaporation, multi-effect flashing steam, biochemical treatment etc.But, because in high-salt wastewater, saltiness is higher, there is strong restraining effect for microorganism, thus cause the needs when adopting microbial treatment method process high-salt wastewater adopt and cultivate Facultative Halophiles, culturing process is complicated, and system stability is poor, and working cost is higher; And when adopting the evaporation technology such as MVR or multiple-effect evaporation process high-salt wastewater; due to existence organic in waste water; in evaporative process, heavy constituent COD becomes separating/enriching; have a strong impact on the crystallization of salt, system usually can be caused to need to empty evaporative crystallizer after operation for some time, reopen flow process; a large amount of abraum salts can be produced simultaneously; in addition, due to the existence of volatility COD in steam (or CODD decomposition by-products), the heat exchange efficiency in evaporative process is also usually caused to decline.
For above situation, current those skilled in the art adopt organic membrane or ceramic membrane filter technology to carry out pre-treatment to organic high-salt wastewater usually, to reduce or to eliminate the COD composition in high-salt wastewater.But, adopt above-mentioned technology time, ceramic membrane filter equipment in use for some time, because COD composition is in the deposition on film surface, back flushing process must be carried out, and back flushing process is for improving the effect of the membrane filtration decrease in efficiency caused due to organic matter and not obvious; And in the use procedure of organic membrane, face filtration decline that COD component deposition causes and the situation that membrane lifetime shortens equally.In addition, adopt traditional tympanum or rotate the process that membrane filtration carries out organic high-salt wastewater, it is the deposition being reduced film surface by the increase shearing force on film surface and the mode of flow velocity, and to improve the life-span of film, but traditional tympanum is limited for the raising of membrane lifetime.The long-acting steady running of filter plant cannot be realized.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of stable and process recovery system of organic high-salt wastewater that processing efficiency is high.
For achieving the above object, the utility model is by the following technical solutions:
A process recovery system for organic high-salt wastewater, involving vibrations formula membrane filter unit, the vibration-type membrane upgrading unit be connected with the water outlet of described vibrating membrane filtration unit and the MVR evaporation element be connected with the water outlet of described vibration-type membrane upgrading unit.
Preferably: the vibration source of described vibrating membrane filtration unit is Low-Frequency Mechanical twisting vibration and/or high frequency ultrasound vibration.
Preferably: the vibration source of described vibration upgrading unit is Low-Frequency Mechanical twisting vibration and/or high frequency ultrasound vibration.
Preferably: the vibrational frequency of described Low-Frequency Mechanical twisting vibration is 25-66Hz.
Preferably: the vibrational frequency of described high frequency ultrasound vibration is 20-130kHz.
Preferably: the filtering membrane of described vibrating membrane filtration unit is ultra-filtration membrane, nanofiltration membrane or reverse osmosis membrane.
Preferably: the filtering membrane of described vibration-type membrane upgrading unit is reverse osmosis membrane.
Preferably: between described vibration-type membrane upgrading unit and MVR evaporation element, be also provided with electrodialysis process unit or electric flocculation treatment unit.
Preferably: described MVR evaporation element comprises the First Heat Exchanger, vaporizer, the second interchanger, crystallizer and the compressor that are connected by pipeline.
Preferably: described MVR evaporation element comprises the interchanger, vaporizer, solid-liquid separator and the compressor that are connected by pipeline.
The beneficial effects of the utility model are, wastewater treatment and recovery system of the present utility model, can according to the molecular weight of COD component in waste water and aggregate distribution, take different waste water filterings and concentration formats: in the COD component of waste water containing molecular weight be greater than 150 be less than the organic pollutant of 1000 time, nanofiltration membrane can be selected to process, when containing the organic pollutant of molecular weight more than 1000 in the COD component of waste water, ultra-filtration membrane can be selected to process, and when only containing the colloidalmaterial of suspended substance or macromolecule in waste water, then select microfiltration membrane process.Machinery and ultrasonic wave two kinds of vibration modes synergy under, effectively can reduce the deposition of COD composition on film surface, the life-span of membrane component is made to improve 3-5 doubly, in addition, under the synergy of two kinds of vibration modes, also significantly can promote the filtrate flux of membrane module, and finally realize molecular weight be the COD composition of more than 300 before the vaporizer entering MVR evaporation element, its decreasing ratio can reach more than 98%; Be applicable to the high-salt wastewater that process chemical industry, gas-field exploitation and the industry such as processing, pharmacy produce, and treatment effect is obvious.
Accompanying drawing explanation
Fig. 1 shows the FB(flow block) of organic high-salt wastewater process recovery system described in the utility model;
Fig. 2 shows a kind of embodiment of organic high-salt wastewater process recovery system described in the utility model;
Fig. 3 shows the another kind of embodiment of organic high-salt wastewater water yield recovery system described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, organic high-salt wastewater process recovery system described in the utility model, comprise the vibrating membrane filtration unit, vibration-type membrane upgrading unit and the MVR evaporation element that are communicated with successively, wherein, the filtering membrane of described vibrating membrane filtration unit can adopt ultra-filtration membrane, nanofiltration membrane or reverse osmosis membrane, the preferred 0.2-1nm of membrane pore size of described nanofiltration membrane, membrane flux is 0.2-0.4t/m
2h, the membrane pore size of described ultra-filtration membrane preferably 0.001 μm-0.02 μm, to remove the heavy COD component (COD component molecular amount is greater than 1000) in waste water, as: polycyclic aromatic hydrocarbons, polychlorobiphenyl etc.; Dense water after vibrating membrane filtration unit filters enters into vibration-type membrane upgrading unit and carries out concentration to organic high-salt wastewater, the preferred reverse osmosis membrane of filtering membrane of described vibration-type membrane upgrading unit, and the preferred 0.1nm-1nm of membrane pore size, the water outlet after vibration-type membrane upgrading unit concentrates enters into the separating treatment that MVR evaporation element carries out salt solution; Described MVR evaporation element comprises the compressor of connection, interchanger, vaporizer and crystallizer/centrifuge separator etc., and MVR evaporation element described in the utility model can according to the difference of handled object, adopt one-level evaporation and crystallization mode or dual evaporation crystallization mode respectively, the crystal salt produced through MVR evaporation element evaporative crystallization is recyclable, and the water of condensation of generation can directly outer row or reuse.
In the utility model, the tubulose module that the filtering membrane of described vibrating membrane filtration unit and vibration-type membrane upgrading unit can adopt multilayer video disc to form, and the vibration source of described vibrating membrane filtration unit and vibration-type membrane upgrading unit can adopt Low-Frequency Mechanical twisting vibration and/or high frequency ultrasound vibration mode, and the vibrational frequency of Low-Frequency Mechanical twisting vibration is 25-66Hz, single amplitude is 11-21mm, single motor or twin motors exciting can be adopted, subresonance coefficient is 0.7-0.9, in this interval range, amplitude amplification factor is 1.96-5.26, use less power of motor can obtain comparatively large amplitude, simultaneously vibrating mass can be avoided resonating and the infringement that causes, filtrate forms on film surface the shear wave transmitted along face vertical direction, decay wavelength 1-2mm, avoid the deposition of COD composition on film surface and enrichment, the vibrational frequency of described high frequency ultrasound vibration is 20-130kHz, and ultrasonic power density is 0.5-1.5w/cm
2ultrasonic wave at liquid phase and membrane surface by high-frequency compression power with subtract pressure initiation vacuum bubbles and make it broken, powerful surging force can be produced in this process, the COD composition being attached to film surface is separated with film surface, in the utility model, on the two ends that ultrasonic generator can be arranged on columnar membrane assembly or cylindrical shell, and its to run quantity can be single group or many groups.
Further, process recovery system described in the utility model also can comprise is located at electrodialysis between vibration-type membrane upgrading unit and MVR evaporation element or electric flocculation unit, water outlet after vibration-type membrane upgrading unit concentration is introduced into electrodialysis or electric flocculation unit and carries out electrodialysis or electric flocculation treatment to remove the COD component of extra small molecular weight in waste water (COD component molecular amount is less than 150), and enters into MVR evaporation element after carrying out further concentration to waste water simultaneously again and carry out subsequent disposal.In addition, process recovery system described in the utility model also comprises and is located at connecting pipe between each treatment unit for waste water and lift pump.
Adopt the utility model to process recovery system as above to process organic high-salt wastewater, its treatment step comprises:
1) to promote through pump containing organic high-salt wastewater of COD composition and enter into vibrating membrane filtration unit and carry out vibrating membrane filtration process, to remove the heavy COD composition in waste water;
2) water outlet of vibrating membrane filtration unit promotes through pump and enters into vibration-type membrane upgrading unit and carry out vibration-type membrane concentration, and the salt solution pre-concentration make to remove COD under the effect of reverse osmosis membrane after to massfraction is 8-10%;
3) salt solution after the process of vibrating membrane filtration unit pre-concentration enters into MVR evaporation element and carries out evaporative crystallization process, salt solution in MVR evaporation element prior to 102-110 DEG C at concentration and evaporation to nearly state of saturation, then at 105-113 DEG C, evaporative crystallization is separated to obtain crystal salt and water of condensation, crystal salt is recyclable, and water of condensation can directly outer row or reuse.
Further, vibration source in described vibrating membrane filtration process and vibration-type membrane concentration step can adopt Low-Frequency Mechanical twisting vibration and/or high frequency ultrasound vibration mode, and the vibrational frequency of Low-Frequency Mechanical twisting vibration is 25-66Hz, single amplitude is 11-21mm, can adopt single motor or twin motors exciting; The vibrational frequency of described high frequency ultrasound vibration is 20-130kHz, and ultrasonic power density is 0.5-1.5w/cm
2.
In addition, described treatment step also can comprise the electrodialysis process of salt solution or electric flocculation treatment, and salt solution after the process of vibration-type membrane upgrading unit pre-concentration first carries out evaporative crystallization process through electrodialysis process or electric flocculation treatment to enter into MVR evaporation element again after the COD component removing the extra small molecular weight in waste water.
Embodiment 1
Adopt the utility model to process recovery system and art breading drugmaker as above and produce the high-salt wastewater that product produces, the output of waste water is 35t/h, initial salt concentration is 6%, containing multiple organic matter in waste water, comprise ether of cellulose, polycyclic aromatic hydrocarbons, lipid colloid substances, polychlorobiphenyl etc., complicated component, the color of waste water is yellow, and containing solid impurity.
According to the feature of required process waste water, the utility model adopts process recovery process as shown in Figure 2, wherein: the filtering membrane of vibrating membrane filtration unit adopts membrane pore size to be the nanofiltration membrane of 1nm, and its membrane flux is 0.2-0.4t/m
2h, vibration source adopts vibrational frequency to be the twisting vibration of 58Hz Low-Frequency Mechanical and vibrational frequency to be the high frequency ultrasound vibration of 88kHz simultaneously, can remove all solids impurity in waste water and stop COD composition; Because the lightweight COD composition in this waste water is negligible, COD content 350mg/l in liquid after filtration treatment, COD component is the hydrocarbons that a small amount of molecular weight is less than 200.Therefore, in the present embodiment, waste water after nanofiltration process directly enters into vibration-type membrane upgrading unit and carries out concentration, the concentrated film of vibration-type membrane upgrading unit can adopt membrane pore size to be the reverse osmosis membrane of 0.2nm, after the concentration of waste water is concentrated into 8-10%, waste water enters into MVR evaporation element and carries out evaporative crystallization process.In the present embodiment, described MVR evaporation element adopts double flash evaporation crystallisation mode, comprise First Heat Exchanger, vaporizer, second interchanger, crystallizer and compressor, the concentrated solution of vibration-type membrane upgrading unit enters vaporizer and evaporates after First Heat Exchanger heat exchange, now, the concentration of waste water becomes about 28%, subsequently, after the second interchanger again heat exchange, enter into crystallizer from vaporizer out closely saturated concentrated solution and carry out Crystallization Separation, be separated the crystal salt obtained recyclable, isolated secondary steam enters First Heat Exchanger for circular water replenishing etc. after compressor compression, wherein: the pressure of described compressor is 10kPa-40kPa, compressor form can be radial compressor, Roots Compressor or its combination, described first, the heat exchange form of the second interchanger can adopt tank external heat-exchanging, rise embrane method evaporation and heat-exchange or falling liquid film method evaporation and heat-exchange etc.Adopt evaporative crystallization technique described above, in whole service process, often evaporating a water only needs power consumption about 50 degree, energy-conserving and environment-protective.
Embodiment 2
With process recovery system described in the utility model and technique, the high-salt wastewater produced in certain chemical plant production process is processed, saltiness in this waste water is about 600mg/L, waste water output is 10t/h, COD content in waste water is 1500mg/l, but COD component molecular amount is less, and the main component of COD is benzene homologues, alkane, organophosphorus etc.
According to above-mentioned waste water characteristic, the present embodiment adopts process recovery process as shown in Figure 3, wherein: the filtering membrane of vibrating membrane filtration unit and vibration-type membrane upgrading unit all adopts reverse osmosis membrane, or as shown in Fig. 3 technique, it is same RO membrane filtration upgrading unit that vibrating membrane filtration unit and vibration-type membrane upgrading unit can close whole, waste water removes most COD in waste water composition through RO membrane filtration concentration, and concentrates waste water simultaneously, after RO membrane filtration concentration, waste water enters electrodialysis cell and carries out electrodialysis process, to remove the COD component of the small-molecular-weight of 70-90% in waste water, and can concentrate further waste water, the alkane of to be about 150mg/l, COD component the be small-molecular-weight of liquid COD content after treatment, subsequently, waste water enters into MVR evaporation element, in the present embodiment, because steam output is less, thus described MVR evaporation element adopts one-level evaporative crystallization pattern, comprise compressor, interchanger, vaporizer and centrifuge separator, the concentrated solution that electrodialysis cell produces enters vaporizer and carries out heat exchange evaporation after interchanger heat exchange, subsequently, the feed liquid that evaporator evaporation produces enters into the solid-liquid separation that centrifuge separator carries out salt-water, be separated the salt obtained recyclable, again enter MVR evaporation element after the concentrated solution that isolated liquid can produce with electrodialysis cell mixes and carry out next circular treatment, the secondary steam that vaporizer produces enters interchanger and again circulates after compressor compression.
Wastewater treatment and recovery system of the present utility model and technique can according to the molecular weight of COD component in waste water and aggregate distributions, take different waste water filterings and concentration formats, finally can realize molecular weight is that the COD composition of more than 300 is before the vaporizer entering MVR evaporation element, its decreasing ratio can reach more than 98%, and realize improving 3-5 doubly work-ing life with material membrane assembly, MVR evaporation element continuous operating time extends 4-6 doubly.In addition, the utility model can adopt high frequency ultrasound to vibrate and mechanical vibrating system effect, composition is deposited by the COD of film sur-face peeling under ul-trasonic irradiation, film surface is pushed away further by low frequency torsional oscillation raw shear wave of dissipating one's fortune, the life-span of the lower film of synergy is greater than the situation being used alone ultrasonic wave and Low-Frequency Mechanical torsion, and, when identical seepage water pressure and permeable material, during two vibration synergy, the permeation flux of film is greater than membrane flux increased value when using single vibration form, improves waste water treatment efficiency.
Be only the utility model preferred embodiment in sum, be not used for limiting practical range of the present utility model.Namely all equivalences done according to the content of the utility model the scope of the claims change and modify, and all should belong to technology category of the present utility model.
Claims (10)
1. a process recovery system for organic high-salt wastewater, is characterized in that: involving vibrations formula membrane filter unit, the vibration-type membrane upgrading unit be connected with the water outlet of described vibrating membrane filtration unit and the MVR evaporation element be connected with the water outlet of described vibration-type membrane upgrading unit.
2. process recovery system according to claim 1, is characterized in that: the vibration source of described vibrating membrane filtration unit is Low-Frequency Mechanical twisting vibration and/or high frequency ultrasound vibration.
3. process recovery system according to claim 1, is characterized in that: the vibration source of described vibration upgrading unit is Low-Frequency Mechanical twisting vibration and/or high frequency ultrasound vibration.
4. the process recovery system according to Claims 2 or 3, is characterized in that: the vibrational frequency of described Low-Frequency Mechanical twisting vibration is 25-66Hz.
5. the process recovery system according to Claims 2 or 3, is characterized in that: the vibrational frequency of described high frequency ultrasound vibration is 20-130kHz.
6. process recovery system according to claim 1, is characterized in that: the filtering membrane of described vibrating membrane filtration unit is ultra-filtration membrane, nanofiltration membrane or reverse osmosis membrane.
7. process recovery system according to claim 1, is characterized in that: the filtering membrane of described vibration-type membrane upgrading unit is reverse osmosis membrane.
8. the process recovery system according to claim 1 or 2 or 3 or 6 or 7, is characterized in that: be also provided with electrodialysis process unit or electric flocculation treatment unit between described vibration-type membrane upgrading unit and MVR evaporation element.
9. the process recovery system according to claim 1 or 2 or 3 or 6 or 7, is characterized in that: described MVR evaporation element comprises the First Heat Exchanger, vaporizer, the second interchanger, crystallizer and the compressor that are connected by pipeline.
10. the process recovery system according to claim 1 or 2 or 3 or 6 or 7, is characterized in that: described MVR evaporation element comprises the interchanger, vaporizer, solid-liquid separator and the compressor that are connected by pipeline.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649499A (en) * | 2015-03-18 | 2015-05-27 | 山东博润工业技术股份有限公司 | Treatment recovery system for organic high-salt waste water and process thereof |
| CN106082516A (en) * | 2016-07-12 | 2016-11-09 | 中国石油集团东北炼化工程有限公司吉林设计院 | A kind of point of salt-pepper noise technique and device |
| CN106546543A (en) * | 2016-11-04 | 2017-03-29 | 天津大学 | A kind of petrifaction sewage COD feature distribution research methods |
-
2015
- 2015-03-18 CN CN201520152796.2U patent/CN204529576U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649499A (en) * | 2015-03-18 | 2015-05-27 | 山东博润工业技术股份有限公司 | Treatment recovery system for organic high-salt waste water and process thereof |
| CN106082516A (en) * | 2016-07-12 | 2016-11-09 | 中国石油集团东北炼化工程有限公司吉林设计院 | A kind of point of salt-pepper noise technique and device |
| CN106082516B (en) * | 2016-07-12 | 2020-02-11 | 中国石油集团东北炼化工程有限公司吉林设计院 | Salt separation crystallization process and device |
| CN106546543A (en) * | 2016-11-04 | 2017-03-29 | 天津大学 | A kind of petrifaction sewage COD feature distribution research methods |
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