CN103373786B - A kind for the treatment of process of reverse osmosis concentrated water - Google Patents
A kind for the treatment of process of reverse osmosis concentrated water Download PDFInfo
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Abstract
The invention discloses a kind for the treatment of process of reverse osmosis concentrated water, comprise and crystallization treatment and membrane distillation process are carried out successively to reverse osmosis concentrated water.The inventive method is carried out under normal pressure, low temperature, have simple to operate, be convenient to the feature managed, the concentration reducing scale-forming ion in reverse osmosis concentrated water is softened by induced crystallization, membrane distillation concentration process can be carried out under lower fouling membrane, while significantly decrement reverse osmosis concentrated water, obtain the industrial pure water of high-quality, can industrial production be back to, successfully solve the process problem of reverse osmosis concentrated water, be with a wide range of applications.
Description
Technical field
The present invention relates to a kind for the treatment of process of sewage, particularly a kind for the treatment of process of reverse osmosis concentrated water, belong to Treatment of Industrial Water field.
Background technology
At present, reverse osmosis technology has been widely used in the purifying treatment of industry and domestic water as a kind of standard water treatment technology.But due to the existence of fouling membrane in reverse osmosis process, make the producing water ratio of reverse osmosis maintain a lower level all the time.The theoretical producing water ratio of first-stage reverse osmosis is 75%, and actual producing water ratio is only 50%-60%.For the city reverse osmose pure-water production system in about 100,000 tons/day, current Beijing, enterprise needs the tap water consuming nearly 150,000 tons every day, wherein about there is the water yield of 1/3 directly will be discharged municipal sewage pipe network as reverse osmosis concentrated carnallite water, not only cause water resources serious waste, and the high salinity seriously exacerbating water surrounding is polluted.
Domestic and international researchist is devoted to the producing water ratio improving reverse osmosis process always, but the rising of producing water ratio is along with problems such as working pressure rising and calcium ions and magnesium ions foulings, so the simple rate of recovery improving reverse osmosis seldom adopts in actual mechanical process, many employings reverse osmosis technology combines mode to improve the rate of recovery with other films and non-membrane technique, reduces concentrated water drainage high-volume.There is report to adopt the nanofiltration of high desalination to combine with reverse osmosis membrane technology, under the condition not improving working pressure, the producing water ratio of reverse osmosis seawater desalting can be made to be increased to more than 60% from 30-40%.In addition, adopt two-pass reverse osmosis coupling to improve producing water ratio and also have report.But along with the raising of producing water ratio, not only fouling membrane is very serious, and causes working pressure to increase rapidly because salinity is raised to, and therefore needs badly and develops economically viable reverse osmosis concentrated water technology.
Membrane distillation is a kind of employing dewatering microporous film, the membrane separating process being mass transfer driving force with film both sides vapor pressure difference.When the aqueous solution of differing temps is separated by dewatering microporous film, due to the hydrophobicity of film, the aqueous solution of film both sides all can not enter another example through fenestra, but because the water vapor pressure of the hot side aqueous solution and membrane interface is higher than cold side, water vapor will enter cold side and condensation through fenestra from hot side, becomes water seepage.Dense water is stayed the formation of hot side and is oozed Yu Shui.Compared with the pressure-driven membrane separating process (reverse osmosis, nanofiltration etc.) of routine, membrane distillation has the following advantages: (1) membrane distillation process is almost carry out at ambient pressure, and equipment is simple, easy to operate; (2) in the membrane distillation process of the Nonvolatile solute aqueous solution, only have water vapor can through fenestra, so distillate is very pure; (3) can process the aqueous solution of high concentration, be the membrane process uniquely directly isolating crystallized product at present from solution; (4) without the need to solution is heated to boiling point, only need the temperature difference that film both sides remain suitable, this process just can be carried out, and likely utilizes the cheap energy such as waste heat and warm trade effluent of sun power, underground heat, factory.
Consider that membrane distillation can process the feature of highly concentrated solution, the concentration of reverse osmosis concentrated water can be applied to improve the producing water ratio of reverse osmosis concentrated water, but under heating state, the Ca contained in reverse osmosis concentrated water
2+, Mg
2+still can cause fouling membrane Deng scale-forming ion, after therefore needing that certain sofening treatment is carried out to reverse osmosis concentrated water, concentration can be carried out by film distillation technology.
It is utilize some ion that is original in water or that add and scale-forming ion, as Ca that induced crystallization softens
2+, Mg
2+deng generation precipitin reaction, generate crystal, in waste water, then add a kind of structure solid particulate similar to this crystal with surface properties (crystal seed), to destroy the metastable state of solution, make the crystalline deposit of generation, thus reach softening object.Selected by crystallization process removal heavy metal to lure brilliant carrier to be generally particle diameter be 0.1-0.5mm quartz sand class material, precipitation agent generally selects oxyhydroxide, sulfide or carbonate.
Summary of the invention
The object of the present invention is to provide a kind for the treatment of process of the reverse osmosis concentrated water based on film distillation technology, reverse osmosis concentration treatment process of the present invention can reduce fouling membrane, realize the further concentration to reverse osmosis concentrated water, while the water yield significantly reducing reverse osmosis concentrated water, obtaining in a large number can the pure water of direct reuse.
For realizing object of the present invention, one aspect of the present invention provides a kind for the treatment of process of reverse osmosis concentrated water, comprises and carries out crystallization treatment and membrane distillation process successively to reverse osmosis concentrated water.
Wherein, described reverse osmosis concentrated water refers to the water of the specific conductivity >=1000 μ S/cm produced after industrial pure water prepared by employing reverse osmosis system.
Particularly, described specific conductivity is preferably 1000-3500 μ S/cm.
Particularly, main containing Ca in described reverse osmosis concentrated water
2+, Mg
2+, K
+, Na
+deng inorganic ion, TOC (total organic carbon) < 5mg/L.
Especially, Ca in described reverse osmosis concentrated water
2+< 500mg/L, Mg
2+< 500mg/L.
Wherein, described crystallization treatment comprises the step that following order is carried out:
1) in reverse osmosis concentrated water, crystallization inducible vectors is added;
2), after stirring reaction 1-3h, staticly settle, crystallize out;
3) filter, carry out solid-liquid separation, the crystal that filtering is separated out, obtain softening water (softening water namely after crystallization treatment).
Particularly, step 1) described in crystallization inducible vectors select quartz sand or calcium carbonate.
Especially, the granularity of described crystallization inducible vectors quartz sand or calcium carbonate is 0.1-0.5mm.
Particularly, step 1) described in the consumption of crystallization inducible vectors be the crystalline carrier adding 3-7g in every 1L reverse osmosis concentrated water, the amount being preferably the crystalline carrier added in every 1L reverse osmosis concentrated water is 3-5g, crystalline carrier quartz sand or the calcium carbonate of 3-7g is added in every 1L reverse osmosis concentrated water, the amount being preferably the crystalline carrier added in every 1L reverse osmosis concentrated water is 3-5g, adds crystalline carrier quartz sand or the calcium carbonate of 3-5g in every 1L reverse osmosis concentrated water.
Particularly, add described crystallization inducible vectors under whipped state, stir speed (S.S.) is 200-300r/min.
Wherein, step 2) described in staticly settle the time be 1-2h, be preferably 1h; Step 3) described in be filtered into micro-filtration.
Particularly, the filter core that described filtration treatment uses selects polypropylene fibre filter core, nylon filter core or tetrafluoroethylene filter core.
Especially, average membrane pore size≤5 μm of described filter core.
Wherein, in described membrane distillation treating processes, the temperature head of controlling diaphragm both sides is 10-60 DEG C.
Particularly, control in described membrane distillation treating processes through the temperature of the water of crystallization sofening treatment be 50-70 DEG C.
Especially, in described membrane distillation treating processes, the temperature of cold side pure water is 10-30 DEG C.
Wherein, the membrane module used in membrane distillation treating processes selects plate film assembly or hollow fiber film assembly.
Particularly, tetrafluoroethylene selected by the mould material of described membrane module, poly-inclined tetrafluoroethylene or polypropylene.
Especially, the membrane pore size of the mould material of described membrane module is 0.2-0.5 μm.
Especially, the performance perameter of the hollow-fibre membrane be made up of described poly-inclined tetrafluoroethylene is: internal diameter 0.8mm, external diameter 1mm, wall thickness 0.1mm, average membrane pore size 0.15 μm, porosity 76%, liquid enters fenestra minimal pressure (LEPw) 250kPa.
Particularly, described membrane distillation is treated to the distillation of direct contact membranes, pressure reducing film distillation process or air-gap membrane distillation, is preferably the distillation of direct contact membranes, pressure reducing film distillation process.
Particularly, also be included in before carrying out crystallization treatment, pH >=10 that pH adjusting agent regulates reverse osmosis concentrated water are added in reverse osmosis concentrated water, being preferably pH value is 10.0-12.10, more preferably 10.0-11.5, thus guarantee that reverse osmosis concentrated water is in the process of adjust ph, does not produce magnesium hydroxide colloidal, improve the crystalline rate of crystallization treatment.
Particularly, described pH adjusting agent select in sodium carbonate, salt of wormwood, sodium hydroxide, potassium hydroxide one or more.
Wherein, described pH adjusting agent is preferably sodium carbonate and sodium hydroxide.
Particularly, add the sodium carbonate of 0.1-10g in every 1L reverse osmosis concentrated water, the amount being preferably the sodium carbonate added in every 1L reverse osmosis concentrated water is 1-5g, more preferably 1.5-4g, is further preferably 1.9-2g.
First reverse osmosis concentrated water carries out sofening treatment by induced crystallization reactor, removes the Ca in reverse osmosis concentrated water
2+, Mg
2+deng scale-forming ion.Agitator is used to carry out the abundant mixing stirring to ensure reverse osmosis concentrated water, precipitation agent and crystallization inducible vectors in induced crystallization softening process.Stirring can adopt the mode of mechanical stirring or magnetic agitation.After induced crystallization fully reacts, quiescent setting promotes throw out sedimentation.Supernatant liquor is pumped into polypropylene fibre be filter core strainer in, micro-filtration removes unprecipitated throw out in supernatant liquor.
Reverse osmosis concentrated water after micro-filtration directly pumps into membrane distillation reactor (with direct contact membrane distillation, hollow fiber film assembly is example) material liquid tank, entered the inner side of hollow fiber film assembly after heating by magnetic drive pump, after flow back to material fluid bath, form the hot side circulation of membrane distillation.Meanwhile, pure water enters after refrigerating unit from product water pot through magnetic drive pump, enters the outside of hollow fiber film assembly, carries and permeate the water vapor condensate of coming from hot side and get back to product water pot, and the cold side forming membrane distillation circulates.The continuous cross-film of water vapour in the reverse osmosis concentrated water of hot side enters cold side, and realize the constantly concentrated of reverse osmosis concentrated water, cold side water vapour condensation forms pure water.Concentrated reverse osmosis concentrated water, obtains a large amount of pure water.
Compared with prior art, the present invention has the following advantages:
1, first treatment process of the present invention adopts induced precipitation crystallization process, and reverse osmosis concentrated water is carried out sofening treatment, and the major part removed in reverse osmosis concentrated water easily forms the soluble ion of incrustation scale, such as Ca
2+, Mg
2+deng scale-forming ion, reduce dense water hardness, decrease the pollution to film in membrane distillation treating processes.
2, regulate the pH of reverse osmosis concentrated water to be greater than 10.0 in the present invention, improve in crystallization the efficiency producing crystal settling.
3, the pH adjusting agent Na in the present invention
2cO
3except regulating the pH value of reverse osmosis concentrated water, in crystallization, also assures that the pH scope needed for crystalline deposit, in turn ensure that in solution to there is enough crystal seeds, can induce and accelerate precipitin reaction.
4, stir in crystallization of the present invention, ensure the abundant mixing of reverse osmosis concentrated water, precipitation agent and crystal seed, destroy the metastable state of solution simultaneously, improve crystallization treatment efficiency.
5, in membrane distillation treating processes of the present invention, the temperature head of film both sides maintains between 10 DEG C-60 DEG C, induced crystallization softens and eliminates a large amount of scale-forming ions, reduce reverse osmosis concentrated water scaling tendency at high temperature, reduce the generation of fouling membrane, therefore concentrate reverse osmosis concentrated water under up to the temperature difference of 60 DEG C, be both beneficial to water vapor cross-film, be conducive to again being condensed into pure water in product water side, there is high yield water flux, improve the efficiency of membrane distillation process, obtain the product water of high-quality.
6, treatment process process effects factor of the present invention is little, and process is convenient to control and realize automatization.
Accompanying drawing explanation
Fig. 1 is reverse osmosis concentrated water processing flow chart of the present invention;
Fig. 2 is the reverse osmosis concentrated water treating equipment connection diagram of the present invention.
Description of reference numerals:
1, crystallization reactor; 2, strainer; 3, membrane distillation reactor; 4, material liquid tank; 5, membrane component; 6, refrigerating unit; 7, water pot is produced; 8, thermometer; 9, spinner-type flowmeter; 10, specific conductivity monitor; 11, well heater; 12, pump; 13, valve; 14, agitator.
Specific implementation method
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention will be more clear along with description.But these embodiments are only exemplary, do not form any restriction to scope of the present invention.It will be understood by those skilled in the art that and can modify to the details of technical solution of the present invention and form or replace down without departing from the spirit and scope of the present invention, but these amendments and replacement all fall within the scope of protection of the present invention.
1,2 describe the reverse osmosis concentrated water treatment technological process of the present invention in detail with reference to the accompanying drawings.
As shown in Figure 1, 2, reverse osmosis concentrated water technology of the present invention comprises crystallization sofening treatment and membrane distillation except two stages of Ficus caricaL.
Reverse osmosis concentrated water is sent in induced precipitation crystallization reactor 1, adding pH adjusting agent regulates the pH of dense water to be greater than 10.0, then crystallization inducible vectors is added, reverse osmosis concentrated water carries out induced precipitation crystallization process in induced precipitation crystallization reactor 1, after induced crystallization has reacted, leave standstill and place, carry out the precipitation of crystallisate, with pump 12, reaction solution is pumped in strainer 2, the filter core of middle filtrator of the present invention selects polypropylene filter core, carry out solid-liquid separation further, to remove the throw out in supernatant liquor, obtain the softening water after crystallization treatment, crystalline deposit thing part sends back in crystallization reactor 1, as crystallization inducible vectors.
PH adjusting agent in the embodiment of the present invention selects sodium hydroxide or sodium carbonate, and pH adjusting agent is except selecting sodium hydroxide or sodium carbonate, and other are as having one or more to be all applicable to the present invention in sodium carbonate, salt of wormwood, sodium hydroxide, potassium hydroxide; Crystallization inducible vectors in the embodiment of the present invention selects calcium carbonate powders, and its particle diameter is 0.1-0.5mm, and other particle diameters are that carrier such as the quartz sand of 0.1-0.5mm is equally applicable to the present invention.The filter core of strainer 2 of the present invention selects 5 μm of polypropylene fibre filter cores, and other filter cores are all applicable to the present invention, such as 5 μm of nylon filter cores or 5 μm of tetrafluoroethylene filter cores.
Softening water is stored in material liquid tank 4, to the softening water heating be stored in material liquid tank, the inner side (hot side) of the membrane module 5 of membrane distillation reactor 3 is pumped into after being heated to 50-70 DEG C, carry out membrane distillation process, the water vapour of hot side softening water is through the mould material of membrane module 5, and enter the cold side of membrane module from hot side, the filtrate after membrane distillation process flows back to material liquid tank again, form the hot side circulation of membrane distillation, softening water is concentrated forms dense water.Pure water in the product water pot 7 of membrane distillation reactor 3 is sent into after cooling system 6 cools the outside (i.e. cold side) of membrane distillation reactor membrane module 5 simultaneously, pure water carries and to permeate the water vapor condensation water of coming from hot side and get back to and produce in water pot, form the cold side circulation of membrane distillation, obtain oozing out pure water.
Adopt direct contact membranes to distill for example is described in the embodiment of the present invention in membrane distillation treating processes, membrane distillation process of the present invention can also adopt pressure reducing film distillation process, air-gap membrane distillation except direct contact membranes distillation.
Membrane component 5 of the present invention is flat sheet membrane or hollow-fibre membrane, and tetrafluoroethylene selected by mould material, polyvinylidene difluoride (PVDF) or polypropylene screen.
Use the hollow fiber film assembly be made up of poly-inclined tetrafluoroethylene in the embodiment of the present invention, film properties parameter is: internal diameter 0.8mm, external diameter 1mm, wall thickness 0.1mm, average membrane pore size 0.15 μm, porosity 76%, liquid enters fenestra minimal pressure (LEPw) 250kPa.
Water quality detection is carried out according to industrial circulating cooling water water quality analysis method (HG/T 3609-2000) in the present invention.
Embodiment 1
Certain drinking water system first-stage reverse osmosis producing water ratio is 50%, and first-stage reverse osmosis dense water water quality is as shown in table 1.
The dense water water quality of table 1 drinking water system first-stage reverse osmosis
1, the pH value of reverse osmosis concentrated water is regulated
In the volume dense water of drinking water system first-stage reverse osmosis described in above-mentioned table 1 that is 10L, add the NaOH solution that concentration is 1mol/L, regulate the pH value of dense water to be 10.10;
2, crystallization treatment
Under whipped state, the crystallization inducible vectors CaCO that weight is 50g, granularity is 0.1-0.5mm is added in the dense water after adjust ph
3, carry out crystallization reaction, the stirred crystallization treatment time is 1.5h, and after reaching balance to reaction, stop stirring, reaction solution carries out filtration treatment after staticly settling 1h, and the crystal that filtering crystallization reaction generates obtains softening water; Wherein, stir speed (S.S.) is 200r/min; The CaCO added in every 1L reverse osmosis concentrated water
3weight be 5g; Filtration treatment adopts 5 μm of polypropylene fibre filter cores to carry out.
The water quality of the softening water after crystallization treatment is detected, the Ca of softening water according to the method for national standard industrial circulating cooling water water quality analysis method (HG/T 3609-2000)
2+concentration is down to 9.72mg/L from initial 118.20mg/L, and clearance is 92%; Total hardness is (with CaCO
3meter) be down to 195.6mg/L from initial 470.7mg/L, clearance is 58.4%.
3, membrane distillation process
By softening water pumping as heated in the material liquid tank 4 of membrane distillation reactor 3, send into after making the temperature of softening water reach 50 DEG C in the membrane component 5 of membrane distillation reactor 3 and carry out membrane distillation process, namely the hot side temperature of membrane distillation reactor is 50 DEG C, it is the cold side of the pure water feeding membrane distillation reactor of 20 DEG C by temperature simultaneously, namely controlling diaphragm distillation reactor cold-side temperature is 20 DEG C, because film both sides exist vapor pressure difference, the soften aqueous solution of hot side and the water vapor pressure of membrane interface are higher than cold side, steam permeable membrane hole enters cold side and condensation from hot side, become product water, stay hot side after softening water is concentrated and form dense water.In membrane distillation concentration process, permeant flux (i.e. membrane flux) is by initial 11.91kg/m
2.h 7.97kg/m is dropped to
2.h, fall is 33%, terminates membrane distillation concentration process, and obtain producing water (namely oozing out pure water) 9.25L, obtain dense water 0.25L, lose 0.5L water in operational process, producing water (namely oozing out pure water) yield is 92.5%.
Adopt conductivitimeter to measure oozing out electrical conductivity of water is 5 μ S/cm, Ca in water seepage
2+, Mg
2+, Na
+, K
+, Cl, SO
4 2-, Fe
2+, SiO
3 2-, CO
3 2-, HCO
3deng all not detecting.
Embodiment 2
Certain power plant's first-stage reverse osmosis producing water ratio is 60%, and first-stage reverse osmosis dense water water quality is as shown in table 2.
Table 2 reverse osmosis produced water rate is the dense water water quality of power plant's first-stage reverse osmosis of 60%
1, the pH value of reverse osmosis concentrated water is regulated
In the volume dense water of power plant's first-stage reverse osmosis described in above-mentioned table 2 that is 5L, add the NaOH solution and 10g sodium carbonate that concentration is 1mol/L, regulate the pH value of dense water to be 12.10, the weight of the sodium carbonate added in every 1L reverse osmosis concentrated water is 2g;
2, crystallization treatment
Under whipped state, the crystallization inducible vectors CaCO that weight is 35g, granularity is 0.2-0.4mm is added in the dense water after adjust ph
3, carry out crystallization reaction, continue to be stirred to after reaction reaches balance, stop stirring, reaction solution carries out filtration treatment after staticly settling 2h, and the crystal that filtering crystallization reaction generates obtains softening water; Wherein, stir speed (S.S.) is 300r/min; The CaCO added in every 1L reverse osmosis concentrated water
3weight be 7g, the stirred crystallization treatment time is 2h; Filtration treatment adopts 5 μm of polypropylene fibre filter cores to carry out.
The water quality of the softening water after crystallization treatment is detected, the Ca of softening water according to industrial circulating cooling water water quality analysis method (HG/T 3609-2000)
2+be down to 22.27mg/L from initial 318.20mg/L, clearance is 93%; Mg
2+be down to 26.83mg/L from initial 243.9mg/L, clearance is 89%.
3, membrane distillation process
Softening water being heated to temperature is send into membrane distillation reactor after 60 DEG C, namely the hot side temperature of membrane distillation reactor is 60 DEG C, it is the cold side of the pure water feeding membrane distillation reactor of 10 DEG C by temperature simultaneously, namely controlling diaphragm distillation reactor cold-side temperature is 10 DEG C, because film both sides exist vapor pressure difference, the soften aqueous solution of hot side and the water vapor pressure of membrane interface are higher than cold side, and steam permeable membrane hole enters cold side and condensation from hot side, become and ooze out pure water, stay hot side after softening water is concentrated and form dense water.In membrane distillation concentration process, membrane flux is by initial 13.21kg/m
2.h 8.6kg/m is dropped to
2.h, fall is 35%, and terminate membrane distillation concentration process, to oozing out pure water 4.65L, obtain dense water water 0.15L, lose 0.2L water in operational process, water seepage yield is 93.0%.
Adopt conductivitimeter to measure oozing out electrical conductivity of water is 6.3 μ S/cm, Ca in water seepage
2+, Mg
2+, Na
+, K
+, Cl
-, SO
4 2-, Fe
2+, SiO
3 2-, CO
3 2-, HCO
3 -deng all not detecting.
Embodiment 3
Certain power plant's first-stage reverse osmosis producing water ratio is 65%, and first-stage reverse osmosis dense water water quality is as shown in table 3.
Table 3 reverse osmosis produced water rate is the dense water water quality of power plant's first-stage reverse osmosis of 65%
1, the pH value of reverse osmosis concentrated water is regulated
In the volume dense water of power plant's first-stage reverse osmosis described in above-mentioned table 2 that is 5L, add the NaOH solution and 9.5g sodium carbonate that concentration is 1mol/L, regulate the pH value of dense water to be 11.50, the weight of the sodium carbonate added in every 1L reverse osmosis concentrated water is 1.9g;
2, crystallization treatment
Under whipped state, the crystallization inducible vectors CaCO that weight is 15g, granularity is 0.1-0.5mm is added in the dense water after adjust ph
3, carry out crystallization reaction, after continuation stirring 2h reaches balance to reaction, stop stirring, reaction solution carries out filtration treatment after staticly settling 1h, and the crystal of filtering crystallization reaction generation, obtains softening water; Wherein, stir speed (S.S.) is 200r/min; The CaCO added in every 1L reverse osmosis concentrated water
3weight be 3g, the stirred crystallization treatment time is 2h; Filtration treatment adopts 5 μm of polypropylene fibre filter cores to carry out.
The water quality of the softening water after crystallization treatment is detected, the Ca of softening water according to industrial circulating cooling water water quality analysis method (HG/T 3609-2000)
2+be down to 22.6mg/L from initial 352.1mg/L, clearance is 93.6%; Mg
2+be down to 19.6mg/L from initial 167.8mg/L, clearance is 88.3%.
3, membrane distillation process
Softening water being heated to temperature is send into membrane distillation reactor after 70 DEG C, namely the hot side temperature of membrane distillation reactor is 70 DEG C, it is the cold side of the pure water feeding membrane distillation reactor of 10 DEG C by temperature simultaneously, namely controlling diaphragm distillation reactor cold-side temperature is 10 DEG C, because film both sides exist vapor pressure difference, the soften aqueous solution of hot side and the water vapor pressure of membrane interface are higher than cold side, steam permeable membrane hole enters cold side and condensation from hot side, become product water, stay hot side after softening water is concentrated and form dense water, in membrane distillation concentration process, membrane flux is by initial 15.27kg/m
2.h 9.2kg/m is dropped to
2.h, fall is 40%, and terminate membrane distillation concentration process, obtain oozing out pure water 4.65L, obtain dense water 0.2L, lose 0.15L water in operational process, water seepage yield is 93.0%.
Adopt conductivitimeter to measure oozing out electrical conductivity of water is 7.2 μ S/cm, Ca in water seepage
2+, Mg
2+, Na
+, K
+, Cl, SO
4 2-, Fe
2+, SiO
3 2-, CO
3 2-, HCO
3deng all not detecting.
Claims (3)
1. a treatment process for reverse osmosis concentrated water, is characterized in that comprising and carries out crystallization treatment and membrane distillation process successively to reverse osmosis concentrated water, wherein:
Described crystallization treatment comprises the step that following order is carried out:
1) in reverse osmosis concentrated water, add pH adjusting agent regulates the pH value of reverse osmosis concentrated water to be 10.0-12.10;
2) in reverse osmosis concentrated water, add crystallization inducible vectors, wherein said crystallization inducible vectors selection granularity is solid quartz sand or the calcium carbonate of 0.1-0.5mm; The consumption of described crystallization inducible vectors is the crystallization inducible vectors adding 3-7g in every 1L reverse osmosis concentrated water;
3), after stirring reaction 1-3h, staticly settle, crystallize out;
4) filter, carry out solid-liquid separation, the crystal that filtering is separated out, obtain softening water;
Control in described membrane distillation treating processes through the temperature of the softening water of crystallization treatment be 50-70 DEG C; The temperature head of controlling diaphragm both sides is 10-60 DEG C simultaneously.
2. treatment process as claimed in claim 1, is characterized in that described membrane distillation is treated to the distillation of direct contact membranes, pressure reducing film distillation process or air-gap membrane distillation.
3. treatment process as claimed in claim 1 or 2, it is characterized in that described pH adjusting agent selects in sodium carbonate, salt of wormwood, sodium hydroxide, potassium hydroxide one or more.
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