CN105621770A - High salinity wastewater zero-emission method - Google Patents
High salinity wastewater zero-emission method Download PDFInfo
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- CN105621770A CN105621770A CN201410612315.1A CN201410612315A CN105621770A CN 105621770 A CN105621770 A CN 105621770A CN 201410612315 A CN201410612315 A CN 201410612315A CN 105621770 A CN105621770 A CN 105621770A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/33—Wastewater or sewage treatment systems using renewable energies using wind energy
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The present invention relates to the field of industrial wastewater treatment, and specifically relates to a high salinity wastewater zero-emission method. According to the high salinity wastewater zero-emission method, immersed ultra-filtration, disc tube reverse osmosis (dt-ro) and evaporation crystallization are used for treatment of high salinity wastewater. Firstly the immersed ultra-filtration is used for removing most of turbidity and suspended solids in wastewater, then the disc tube reverse osmosis (dt-ro) is used for deep concentration treatment of the high salinity wastewater with the turbidity and suspended solids being removed, salt solids in the concentration water are crystallized by evaporation crystallization treatment of the reverse osmosis concentration water after the disc tube reverse osmosis deep concentration treatment, and the salt solids and sludge slag produced by regular sludge discharge of the immersed ultra-filtration process are separately and respectively dried. The disc tube reverse osmosis producing water and the evaporation and crystallization producing water produced in the treatment process both can be reused in the production process. According to the high salinity wastewater zero-emission method, the high salinity wastewater emission problem can be solved, meanwhile the recovery of water resources is maximized, and high salinity wastewater zero-emission is basically realized.
Description
Technical field
The present invention relates to field of industrial waste water treatment, the Zero emission method of specifically a kind of high-salt wastewater. Espespecially a kind of " immersion ultrafiltration+disc tube reverse osmosis (dt-ro)+evaporative crystallization " processes the Zero emission method of high-salt wastewater.
Background technology
In recent years, the high-salt wastewater that petroleum chemical enterprise produces becomes one and processes a difficult problem, this strand of waste water can not discharge can not reuse, bring great puzzlement to each enterprise. Therefore, need badly and seek novel isolation technics and solve the process emission problem of such waste water.
Disc tube reverse osmosis (dt-ro) film (DTRO film) is a kind of form of reverse osmosis, is the membrane module being specifically used to and processing high-concentration sewage, and its core technology is dish tubular membrane film post. Reverse osmosis diaphragm and waterpower flow guiding disc are stacked together, are fixed with center pull rod and end plate, then insert in pressure jacket, be formed for a film post. The operation principle of DTRO film is: feed liquid is by entering in the flow guiding disc of bottom by flow-guiding channel behind the gap between membrane stack and shell, processed liquid flows quickly through filter membrane with the shortest distance, then 180 degree are reversed another face, it is flowed into next filtration membrane again, thus formed by flow guiding disc circumference to circle center on film surface, arriving circumference, the tangential flow filtration at Zai Daoyuan center again, concentrated solution finally flows out from feed end flange. While feed liquid flows through filter membrane, permeate is constantly discharged by central collection tube. Concentrated solution and permeate are by being installed on the O RunddichtringO isolation on flow guiding disc. Compare with conventional reverse osmosis, disc tube reverse osmosis (dt-ro) it is a technical advantage that: (1) avoids physical clogging phenomenon. Dish tubular membrane component adopts open runner design, feed liquid effective runner width, it is to avoid physical clogging; (2) film fouling and fouling membrane are less. Adopting and be with convex point-supported flow guiding disc, feed liquid forms turbulence state in filter process, decreases the generation of film surface scale, pollution and concentration polarization phenomenon to the full extent; (3) film long service life. Adopting dish tubular membrane component can effectively reduce film fouling, fouling membrane alleviates, and the cleaning frequency is long, and membrane module is readily cleaned, and after cleaning, flux recovery is good, thus extending the diaphragm life-span; (4) cycles of concentration is high. Dish tubular membrane component is the membrane module that current industrial applications pressure rating is the highest, and operation pressure reaches as high as 16MPa.
In view of the technical advantage of disc tube reverse osmosis (dt-ro) film, this technology is widely used in the landfill leachate treatment of various occasion at present. Chinese patent CN200510102945.5 relate to a kind of method of percolate processing household refuse landfill sites, and this patent, percolate being carried out on the basis of preaeration, have employed disc tube reverse osmosis (dt-ro) technique to process percolate; Chinese patent CN200510102946.X relate to the Apparatus for () and method therefor of a kind of percolate processing municipal solid waste incinerator, the method, for the water quality characteristics of percolate, mainly adopts the technological process of pretreatment+membrane bioreactor+disc tube reverse osmosis (dt-ro). Wherein percolate is mainly adopted centrifuge dehydration to carry out solid-liquid separation by pretreatment, removes a large amount of float; Pretreated percolate is mainly carried out aerobic biochemical by membrane bioreactor, afterwards by ultrafiltration membrance filter separation mud mixture; Disc tube reverse osmosis (dt-ro) is primarily directed to the percolate after Membrane Bioreactor for Wastewater Treatment and is easily separated purification, obtains the good reverse osmosis produced water of quality and reverse osmosis concentrated liquid.
Chinese patent CN201210509879.3 relates to sodium sulfide recovery process and device during a kind of barium sulfate produces, for reclaiming rare sodium sulfide waste liquid, adopting disc tube reverse osmosis (dt-ro) concentrated vitriol sodium weak solution in the technique that this patent relates to, the sodium sulfate concentrated solution after concentration returns in barium sulfate production technology.
Chinese patent CN102557321A relates to the Zero emission method of a kind of hc effluent, have employed crystallization technique, film distillation technology, microwave catalysis combustion technology and solar energy and wind energy power technology, it is achieved wastewater zero discharge. In this patent, described hc effluent initially enters crystallizer and carries out the crystallization of inorganic matter, after be easily separated through Membrane Materials equipment, pure water is obtained through after the steam cooling of Membrane Materials equipment film, other do not obtain miscellaneous water through the mixed vapour of film is condensed, and wherein the entrance of the on-condensible gas in mixed vapour microwave catalysis burner carries out decomposition and obtains nontoxic small-molecule substance.
Chinese patent CN101928087 relates to the processing method of a kind of high-salt wastewater, the conductivity range of handled high-salt wastewater is 3000��10000 �� s/cm, total hardness is 1000��3000mg/L, the handling process adopting " alkali adjusting and hardness removing+immersed microfiltration+neutralization+Membrane Materials " processes above-mentioned high-salt wastewater, while high-salt wastewater has been carried out degree of depth concentration, obtain Membrane Materials and produce water. Chinese patent CN102936065 is directed to a kind of method processing waste water, the method is also adopted by adding alkali except the technological process of hard+filtration+vacuum membrane distillation, add alkali except hard used alkali be sodium hydroxide and sodium carbonate, the waste water system electrical conductivity processed is 10000��50000 �� s/cm, and total hardness is 600��1800mg/L. Above-mentioned two patent be all for hardness higher high-salt wastewater, adopt and add alkali microfiltration except hard as pretreatment, but the dense water problems for Membrane Materials does not provide processing method, thus brings new puzzlement to ecological environment. Additionally, film distillation technology is particularly well-suited to the place having industrial waste heat or other waste heats, when not having used heat or waste heat, its operating cost is higher, limits the application of its further genralrlization.
Summary of the invention
For the defect existed in prior art, it is an object of the invention to provide the Zero emission method of a kind of high-salt wastewater, what this method solve high-salt wastewater is difficult to process problem, and recycle-water resource, operating cost are low to greatest extent.
For reaching object above, the present invention adopts the technical scheme that:
A kind of Zero emission method of high-salt wastewater, including following steps:
(1) immersion ultrafiltration: high-salt wastewater enters into immersion ultra filtration unit and is filtered processing, remove the turbidity in described high-salt wastewater and float, after described immersion ultra filtration unit separates, the ultrafiltration obtained is produced water entrance step (2) and is processed, the regular spoil disposal of immersion ultrafiltration system;
(2) disc tube reverse osmosis (dt-ro): the described ultrafiltration in step (1) is produced water entrance disc tube reverse osmosis (dt-ro) unit and carried out degree of depth concentration, separates after concentration through described disc tube reverse osmosis (dt-ro) unit, obtains reverse osmosis produced water and reverse osmosis concentrated water;
(3) evaporative crystallization: the described reverse osmosis concentrated water in step (2) enters evaporative crystallization unit and is evaporated crystallization treatment, obtains the product water of salt crystalloid and evaporative crystallization.
On the basis of such scheme, the water quality characteristic of high-salt wastewater is: wastewater pH 6.5��7.5, electrical conductivity 10000��20000 �� s/cm, CODcr0��100mg/L, Na+2000��4000mg/L, Cl-2500��5000mg/L, with CaCO3Meter total hardness 100��1000mg/L, SS500��1000mg/L, molten silicon 50��100mg/L, NH4-N50��500mg/L.
On the basis of such scheme, the suspension content of described high-salt wastewater is higher and hardness, content of organics are relatively low.
On the basis of such scheme, the submerged ultrafiltration assembly of immersion ultra filtration unit described in step (1) adopts external-compression type, submerged hollow fiber curtain type film assembly.
On the basis of such scheme, described in step (1), the membrane material of the submerged ultrafiltration assembly of immersion ultra filtration unit is polysulfones, polyacrylonitrile, Kynoar or politef, and membrane aperture ranges for 0.01��0.05 ��m.
On the basis of such scheme, setting aerating system bottom the ultrafiltration pond of immersion ultra filtration unit described in step (1), adopt air compressor to produce compression air, air water volume ratio is 10:1��20:1.
On the basis of such scheme, described aerating system is aeration tube or aeration plate.
On the basis of such scheme, described in step (1), the operating pressure of immersion ultra filtration unit is-0.06��-0.02MPa.
On the basis of such scheme, the disc tube reverse osmosis (dt-ro) membrane module that disc tube reverse osmosis (dt-ro) unit described in step (2) adopts is high pressure or supertension disc tube reverse osmosis (dt-ro) membrane module.
On the basis of such scheme, described in step (2), the operation pressure of disc tube reverse osmosis (dt-ro) unit is 12��16MPa.
On the basis of such scheme, disc tube reverse osmosis (dt-ro) membrane module form described in step (2) is that multiple disc-type diaphragm is connected on a central canal and constitutes disc-type film post.
On the basis of such scheme, evaporative crystallization unit described in step (3) adopts crystallizing evaporator, and thermal source adopts exhaust steam heating.
On the basis of such scheme, described high-salt wastewater processes through described immersion ultra filtration unit, and Water Sproading rate is higher than 95%.
On the basis of such scheme, described ultrafiltration produces water through described disc tube reverse osmosis (dt-ro) cell processing, and Water Sproading rate is higher than 80%.
On the basis of such scheme, described reverse osmosis concentrated water is through described evaporative crystallization cell processing, and Water Sproading rate is higher than 80%.
On the basis of such scheme, system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
The Zero emission method of high-salt wastewater of the present invention provides the benefit that:
1, the present invention is directed to high-salt wastewater, remove on the basis of the most of turbidity in waste water and float adopting immersion ultrafiltration, by disc tube reverse osmosis (dt-ro) technology and evaporative crystallization technique degree of depth concentration, reclaim water resource to greatest extent, solve the advanced treating even zero-emission problem of high-salt wastewater;
2, the present invention takes full advantage of immersion ultrafiltration and can tolerate the advantage of high concentrtion and suspended wastewater, is eliminated the most of turbidity in waste water and float by immersion ultrafiltration, it is simple to follow-up disc tube reverse osmosis (dt-ro) processes;
3, the immersion ultrafiltration technology in the present invention effectively reduces the fouling membrane of disc tube reverse osmosis (dt-ro) process, improves the response rate of disc tube reverse osmosis (dt-ro) system;
4, adopting disc tube reverse osmosis (dt-ro) technique in the present invention, compare with conventional reverse osmosis, disc tube reverse osmosis (dt-ro), by adopting disc tube reverse osmosis (dt-ro) membrane module, effectively slow down fouling membrane, extends cleaning frequency and the service life of film, improve the system response rate;
5, the method adopting the present invention, is possible not only to obtain the product water meeting reuse demand in a large number, and what also solve high-salt wastewater is difficult to process problem simultaneously, while recycle-water resource to greatest extent, substantially realizes zero-emission, has important environmental benefit;
6, the method for the present invention has effectively integrated respective technical advantage, optimizes the technological process of high-salt wastewater advanced treatment and reclamation. The method of the present invention is made directly for multiple-effect evaporation relative to waste water, and operating cost is low, and effectively reduces scaling fouling.
High-salt wastewater is after the inventive method processes, and system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
Accompanying drawing explanation
The present invention has drawings described below:
The process flow diagram of the Zero emission method of the high-salt wastewater of Fig. 1 present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As it is shown in figure 1, the Zero emission method of high-salt wastewater of the present invention, the technical scheme is that
The Zero emission method of the high-salt wastewater of the present invention, including following steps:
(1) immersion ultrafiltration: high-salt wastewater enters into immersion ultra filtration unit and is filtered processing, remove the turbidity in high-salt wastewater and float, after immersion ultra filtration unit separates, the ultrafiltration obtained is produced water entrance step (2) and is processed. The regular spoil disposal of immersion ultrafiltration system, carries out mummification disposal to the mud discharged;
(2) disc tube reverse osmosis (dt-ro): the described ultrafiltration in step (1) is produced water entrance disc tube reverse osmosis (dt-ro) unit and carried out degree of depth concentration, separates after concentration through disc tube reverse osmosis (dt-ro) unit, obtains reverse osmosis produced water and reverse osmosis concentrated water;
(3) evaporative crystallization: the described reverse osmosis concentrated water in step (2) enters evaporative crystallization unit and is evaporated crystallization treatment, obtains the product water of salt crystalloid and evaporative crystallization.
In this process, the evaporative crystallization produced in the reverse osmosis produced water produced in step (2) and step (3) produces water all can be back to production technology.
Present invention is generally directed to the waste water system that suspension content is higher and hardness, content of organics are relatively low, it is provided that a kind of method adopting " immersion ultrafiltration+disc tube reverse osmosis (dt-ro)+evaporative crystallization " to process high-salt wastewater. The method removes the most of turbidity in waste water and float initially with immersion ultrafiltration, adopt disc tube reverse osmosis (dt-ro) that the high-salt wastewater after removing turbidity and float is carried out degree of depth concentration afterwards, reverse osmosis concentrated water after the disc tube reverse osmosis (dt-ro) degree of depth concentrates is evaporated crystallization treatment again, by the salt solid crystal in dense water out, dispose with the body refuse individually mummification of the regular spoil disposal generation of immersion ultrafiltration technology. The disc tube reverse osmosis (dt-ro) produced in this processing procedure produces water and evaporative crystallization produces water and all can be back to production technology.
The method adopting the present invention processes high-salt wastewater, while solving this burst of discharge of wastewater difficult problem, has reclaimed water resource to greatest extent, has substantially achieved the zero-emission of high-salt wastewater.
On the basis of such scheme, the suspension content of described high-salt wastewater is higher and hardness, content of organics are relatively low.
On the basis of such scheme, the water quality characteristic of high-salt wastewater is: wastewater pH 6.5��7.5, electrical conductivity 10000��20000 �� s/cm, CODcr0��100mg/L, Na+2000��4000mg/L, Cl-2500��5000mg/L, with CaCO3Meter total hardness 100��1000mg/L, SS500��1000mg/L, molten silicon 50��100mg/L, NH4-N50��500mg/L.
On the basis of such scheme, the submerged ultrafiltration assembly of immersion ultra filtration unit described in step (1) adopts external-compression type, submerged hollow fiber curtain type film assembly.
On the basis of such scheme, described in step (1), the membrane material of the submerged ultrafiltration assembly of immersion ultra filtration unit can be polysulfones, polyacrylonitrile, Kynoar or politef, and membrane aperture ranges for 0.01��0.05 ��m.
On the basis of such scheme, setting aerating system bottom the ultrafiltration pond of immersion ultra filtration unit described in step (1), adopt air compressor to produce compression air, air water volume ratio is 10:1��20:1.
On the basis of such scheme, described aerating system is aeration tube or aeration plate.
On the basis of such scheme, described in step (1), the operating pressure of immersion ultra filtration unit is-0.06��-0.02MPa.
On the basis of such scheme, the disc tube reverse osmosis (dt-ro) membrane module that disc tube reverse osmosis (dt-ro) unit described in step (2) adopts is high pressure or supertension disc tube reverse osmosis (dt-ro) membrane module.
On the basis of such scheme, described in step (2), the operation pressure of disc tube reverse osmosis (dt-ro) unit is 12��16MPa.
On the basis of such scheme, disc tube reverse osmosis (dt-ro) membrane module form described in step (2) is that multiple disc-type diaphragm is connected on a central canal and constitutes disc-type film post.
On the basis of such scheme, evaporative crystallization unit described in step (3) adopts crystallizing evaporator, and thermal source adopts exhaust steam heating.
High-salt wastewater of the present invention processes through immersion ultra filtration unit, and Water Sproading rate is higher than 95%.
Ultrafiltration of the present invention produces water through disc tube reverse osmosis (dt-ro) cell processing, and Water Sproading rate is higher than 80%.
Reverse osmosis concentrated water of the present invention is through described evaporative crystallization cell processing, and Water Sproading rate is higher than 80%.
High-salt wastewater is after the inventive method processes, and system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
Present invention is generally directed to the high-salt wastewater that suspension content is higher and hardness, content of organics are relatively low, on the basis that turbidity and float are removed in immersion ultrafiltration, adopting disc tube reverse osmosis (dt-ro) to concentrate further, reverse osmosis concentrated water is evaporated crystallization afterwards, it is achieved zero-emission. The technological process of the present invention, reduce further systematic running cost use, and has reclaimed water resource to greatest extent.
The following is specific embodiment.
Embodiment 1
Process flow diagram is shown in Fig. 1. In the present embodiment, the water quality characteristic of high-salt wastewater is: wastewater pH 6.5, electrical conductivity 10000 �� s/cm, CODcr0mg/L, Na+2000mg/L, Cl-2500mg/L, total hardness (CaCO3) 100mg/L, SS500mg/L, molten silicon 50mg/L, NH4-N50mg/L��
The step that the Zero emission method adopting the high-salt wastewater of the present invention processes high-salt wastewater is as follows:
(1) immersion ultrafiltration: high-salt wastewater enters into immersion ultra filtration unit and is filtered processing, remove the most of turbidity in high-salt wastewater and float, after immersion ultra filtration unit separates, the ultrafiltration obtained is produced water entrance step (2) and is processed, the regular spoil disposal of immersion ultrafiltration system, carries out mummification disposal to the mud discharged;
(2) disc tube reverse osmosis (dt-ro): the ultrafiltration in step (1) is produced water entrance disc tube reverse osmosis (dt-ro) unit and carried out degree of depth concentration, separates after concentration through disc tube reverse osmosis (dt-ro) unit, obtains reverse osmosis produced water and reverse osmosis concentrated water;
(3) evaporative crystallization: the reverse osmosis concentrated water in step (2) is evaporated crystallization treatment, evaporation thermal source adopts exhaust steam heating, after evaporative crystallization, obtaining the product water of salt crystalloid and evaporative crystallization, the salt crystalloid obtained carries out mummification disposal.
In above-mentioned steps, in step (1), immersion ultra filtration unit adopts external-compression type, immersion polyvinylidene fluoride hollow fiber curtain type film assembly, membrane aperture 0.01 ��m.
In above-mentioned steps, in step (1), the aerating system bottom the immersion ultrafiltration pond of immersion ultra filtration unit adopts aeration tube aeration, adopts air compressor to produce compression air, and air water volume ratio is 10:1.
In above-mentioned steps, in step (1), the operating condition of immersion ultra filtration unit is: wastewater pH 6.5, operating pressure-0.02MPa.
In above-mentioned steps, in step (2), disc tube reverse osmosis (dt-ro) membrane module used by disc tube reverse osmosis (dt-ro) unit adopts the high pressure disc tube reverse osmosis (dt-ro) film post of PALL company, and the operation pressure of disc tube reverse osmosis (dt-ro) unit is 12MPa.
Under the operating condition of above-mentioned immersion ultra filtration unit, submerged ultrafiltration flux is maintained at 15��22L/m2H, immersion ultrafiltration produces water turbidity less than 0.1NTU, and Water Sproading rate is higher than 95%.
Under the operating condition of above-mentioned disc tube reverse osmosis (dt-ro) unit, disc tube reverse osmosis (dt-ro) membrane flux is maintained at 17��20L/m2H, Water Sproading rate is higher than 80%;
Under the operating condition of above-mentioned evaporative crystallization unit, evaporative crystallization unit Water Sproading rate is higher than 80%;
In above-mentioned steps, reverse osmosis concentrated water processes through the evaporative crystallization of step (3), obtains salt crystalloid, concentrates mummification to dispose.
In above-mentioned steps, the evaporative crystallization produced in the reverse osmosis produced water produced in step (2) and step (3) produces water all can be back to production technology.
High-salt wastewater is after the inventive method processes, and system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
Embodiment 2
Process flow diagram is shown in Fig. 1. In the present embodiment, the water quality characteristic of high-salt wastewater is: wastewater pH 7, electrical conductivity 15000 �� s/cm, CODcr50mg/L, Na+3000mg/L, Cl-3500mg/L, total hardness (CaCO3) 500mg/L, SS700mg/L, molten silicon 70mg/L, NH4-N200mg/L��
The operating procedure of embodiment 2 is identical with embodiment 1, and the difference of the present embodiment and embodiment 1 is:
In above-mentioned steps, in step (1), immersion ultra filtration unit adopts external-compression type, immersion polysulfone hollow fibre curtain type film assembly, membrane aperture 0.03 ��m;
In above-mentioned steps, in step (1), the aerating system bottom the immersion ultrafiltration pond of immersion ultra filtration unit adopts aeration tube aeration, adopts air compressor to produce compression air, and air water volume ratio is 15:1;
In above-mentioned steps, in step (1), the operating condition of immersion ultra filtration unit is: wastewater pH 7, operating pressure-0.04MPa;
In above-mentioned steps, in step (2), disc tube reverse osmosis (dt-ro) membrane module used adopts the high pressure disc tube reverse osmosis (dt-ro) film post of PALL company, and the operation pressure of disc tube reverse osmosis (dt-ro) unit is 14MPa.
Under the operating condition of above-mentioned immersion ultra filtration unit, submerged ultrafiltration flux is maintained at 25��35L/m2H, immersion ultrafiltration produces water turbidity less than 0.2NTU, and Water Sproading rate is higher than 95%.
Under the operating condition of above-mentioned disc tube reverse osmosis (dt-ro) unit, disc tube reverse osmosis (dt-ro) membrane flux is maintained at 18��22L/m2H, Water Sproading rate is higher than 80%;
Under the operating condition of above-mentioned evaporative crystallization unit, evaporative crystallization unit Water Sproading rate is higher than 80%;
In above-mentioned steps, reverse osmosis concentrated water processes through the evaporative crystallization of step (3), obtains salt crystalloid, concentrates mummification to dispose.
In above-mentioned steps, the evaporative crystallization produced in the reverse osmosis produced water produced in step (2) and step (3) produces water all can be back to production technology.
High-salt wastewater is after the inventive method processes, and system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
Embodiment 3
Process flow diagram is shown in Fig. 1. In the present embodiment, the water quality characteristic of high-salt wastewater is: wastewater pH 7.5, electrical conductivity 20000 �� s/cm, CODcr100mg/L, Na+4000mg/L, Cl-5000mg/L, total hardness (CaCO3) 1000mg/L, SS1000mg/L, molten silicon 100mg/L, NH4-N500mg/L��
The operating procedure of embodiment 3 is identical with embodiment 1, and the difference of the present embodiment and embodiment 1 is:
In above-mentioned steps, in step (1), immersion ultra filtration unit adopts external-compression type, immersion polytetrafluoroethylhollow hollow fiber curtain type film assembly, membrane aperture 0.05 ��m;
In above-mentioned steps, in step (1), the aerating system bottom the immersion ultrafiltration pond of immersion ultra filtration unit adopts aeration plate aeration, adopts air compressor to produce compression air, and air water volume ratio is 20:1;
In above-mentioned steps, in step (1), the operating condition of immersion ultra filtration unit is: wastewater pH 7.5, operating pressure-0.06MPa;
In above-mentioned steps, disc tube reverse osmosis (dt-ro) membrane module used adopts the supertension disc tube reverse osmosis (dt-ro) film post of PALL company, and the operation pressure of disc tube reverse osmosis (dt-ro) unit is 16MPa.
Under the operating condition of above-mentioned immersion ultra filtration unit, submerged ultrafiltration flux is maintained at 30��45L/m2H, immersion ultrafiltration produces water turbidity less than 0.5NTU, and Water Sproading rate is higher than 95%;
Under the operating condition of above-mentioned disc tube reverse osmosis (dt-ro) unit, disc tube reverse osmosis (dt-ro) membrane flux is maintained at 16��20L/m2H, Water Sproading rate is higher than 80%;
Under the operating condition of above-mentioned evaporative crystallization unit, evaporative crystallization unit Water Sproading rate is higher than 80%;
In above-mentioned steps, reverse osmosis concentrated water processes through the evaporative crystallization of step (3), obtains salt crystalloid, concentrates mummification to dispose.
In above-mentioned steps, the evaporative crystallization produced in the reverse osmosis produced water produced in step (2) and step (3) produces water all can be back to production technology.
High-salt wastewater is after the inventive method processes, and system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
In the specific implementation, described in step (1), the membrane material of the submerged ultrafiltration assembly of immersion ultra filtration unit is optionally polysulfones, polyacrylonitrile, Kynoar or politef to the present invention, and membrane aperture ranges for 0.01��0.05 ��m.
In the specific implementation, disc tube reverse osmosis (dt-ro) membrane module form described in step (2) is that multiple disc-type diaphragm is connected on a central canal and constitutes disc-type film post to the present invention.
In the specific implementation, evaporative crystallization unit described in step (3) is optionally used existing crystallizing evaporator to the present invention, and thermal source is optionally used exhaust steam heating.
The foregoing is only the preferably possible embodiments of the present invention, not thereby limit to the scope of the claims of the present invention, therefore the equivalence that every utilization description of the present invention and accompanying drawing content are made changes, and is both contained in protection scope of the present invention.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (16)
1. the Zero emission method of a high-salt wastewater, it is characterised in that include following steps:
(1) immersion ultrafiltration: high-salt wastewater enters into immersion ultra filtration unit and is filtered processing, remove the turbidity in described high-salt wastewater and float, after described immersion ultra filtration unit separates, the ultrafiltration obtained is produced water entrance step (2) and is processed, the regular spoil disposal of immersion ultrafiltration system;
(2) disc tube reverse osmosis (dt-ro): the described ultrafiltration in step (1) is produced water entrance disc tube reverse osmosis (dt-ro) unit and carried out degree of depth concentration, separates after concentration through described disc tube reverse osmosis (dt-ro) unit, obtains reverse osmosis produced water and reverse osmosis concentrated water;
(3) evaporative crystallization: the described reverse osmosis concentrated water in step (2) enters evaporative crystallization unit and is evaporated crystallization treatment, obtains the product water of salt crystalloid and evaporative crystallization.
2. the Zero emission method of high-salt wastewater as claimed in claim 1, it is characterised in that the water quality characteristic of high-salt wastewater is: wastewater pH 6.5��7.5, electrical conductivity 10000��20000 �� s/cm, CODcr0��100mg/L, Na+2000��4000mg/L, Cl-2500��5000mg/L, always with CaCO3Meter hardness 100��1000mg/L, SS500��1000mg/L, molten silicon 50��100mg/L, NH4-N50��500mg/L.
3. the Zero emission method of high-salt wastewater as claimed in claim 1, it is characterised in that: the suspension content of described high-salt wastewater is higher and hardness, content of organics are relatively low.
4. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: the submerged ultrafiltration assembly of immersion ultra filtration unit described in step (1) adopts external-compression type, submerged hollow fiber curtain type film assembly.
5. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterized in that: described in step (1), the membrane material of the submerged ultrafiltration assembly of immersion ultra filtration unit is polysulfones, polyacrylonitrile, Kynoar or politef, and membrane aperture ranges for 0.01��0.05 ��m.
6. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterized in that: bottom the ultrafiltration pond of immersion ultra filtration unit described in step (1), set aerating system, adopting air compressor to produce compression air, air water volume ratio is 10:1��20:1.
7. the Zero emission method of high-salt wastewater as claimed in claim 6, it is characterised in that: described aerating system is aeration tube or aeration plate.
8. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: described in step (1), the operating pressure of immersion ultra filtration unit is-0.06��-0.02MPa.
9. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: the disc tube reverse osmosis (dt-ro) membrane module that disc tube reverse osmosis (dt-ro) unit described in step (2) adopts is high pressure or supertension disc tube reverse osmosis (dt-ro) membrane module.
10. the Zero emission method of high-salt wastewater as claimed in claim 9, it is characterised in that: described in step (2), the operation pressure of disc tube reverse osmosis (dt-ro) unit is 12��16MPa.
11. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: disc tube reverse osmosis (dt-ro) membrane module form described in step (2) is that multiple disc-type diaphragm is connected on a central canal and constitutes disc-type film post.
12. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: evaporative crystallization unit described in step (3) adopts crystallizing evaporator, and thermal source adopts exhaust steam heating.
13. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: described high-salt wastewater processes through described immersion ultra filtration unit, and Water Sproading rate is higher than 95%.
14. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: described ultrafiltration produces water through described disc tube reverse osmosis (dt-ro) cell processing, and Water Sproading rate is higher than 80%.
15. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: described reverse osmosis concentrated water is through described evaporative crystallization cell processing, and Water Sproading rate is higher than 80%.
16. the Zero emission method of high-salt wastewater as claimed any one in claims 1 to 3, it is characterised in that: system produces water conductivity��300 �� S/cm, produces water CODcr< 10mg/L, whole system Water Sproading rate is higher than 90%.
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