CN103288178A - A low-energy consumption desalination process for wastewater and an apparatus thereof - Google Patents
A low-energy consumption desalination process for wastewater and an apparatus thereof Download PDFInfo
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- CN103288178A CN103288178A CN2013102537651A CN201310253765A CN103288178A CN 103288178 A CN103288178 A CN 103288178A CN 2013102537651 A CN2013102537651 A CN 2013102537651A CN 201310253765 A CN201310253765 A CN 201310253765A CN 103288178 A CN103288178 A CN 103288178A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 66
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 26
- 238000005265 energy consumption Methods 0.000 title claims abstract description 19
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims abstract description 49
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims abstract description 48
- 238000009292 forward osmosis Methods 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 39
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 32
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 30
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 26
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 26
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 26
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 239000000839 emulsion Substances 0.000 claims abstract description 18
- 238000000197 pyrolysis Methods 0.000 claims description 39
- 239000000243 solution Substances 0.000 claims description 37
- 238000001556 precipitation Methods 0.000 claims description 36
- 235000010216 calcium carbonate Nutrition 0.000 claims description 31
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 230000029087 digestion Effects 0.000 claims description 14
- 239000001569 carbon dioxide Substances 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 9
- 239000006228 supernatant Substances 0.000 claims description 8
- 238000003763 carbonization Methods 0.000 claims description 7
- 235000011089 carbon dioxide Nutrition 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 4
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- 239000002994 raw material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 230000003204 osmotic effect Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000010000 carbonizing Methods 0.000 abstract 2
- 238000004062 sedimentation Methods 0.000 abstract 2
- 239000011575 calcium Substances 0.000 description 5
- 238000011033 desalting Methods 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000000247 postprecipitation Methods 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical group O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
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- 229910052791 calcium Inorganic materials 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
-
- 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
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a low-energy consumption desalination process for wastewater and an apparatus thereof, belonging to the field of wastewater advanced treatment. According to the process, water molecules in raw water naturally osmose and are drawn due to osmotic pressure generated by a calcium bicarbonate solution of a certain concentration, and slaked lime is added into the diluted calcium bicarbonate solution to obtain pure water and calcium carbonate emulsion; and a calcium bicarbonate solution of a relatively high concentration is obtained after the calcium carbonate emulsion is carbonized, and the calcium bicarbonate solution of a relatively high concentration is returned to a forward osmosis unit as drawing liquid. The apparatus comprises a forward osmosis unit, a neutralization reaction unit, a sedimentation unit and a filtration unit which are sequentially connected; wherein the bottom of the sedimentation unit is connected to a carbonizing unit, and the outlet of the carbonizing unit is communicating with the forward osmosis unit. According to the present invention, pure water can be obtained at low costs, with some calcium carbonate obtained, simply through adding a certain amount of slaked lime.
Description
Technical field
The invention belongs to waste water advanced processing technology field, specifically, relate to a kind of less energy-consumption desalination process for waste water and device.
Background technology
Freshwater resources are base substances that the mankind depend on for existence and produce.Along with population growth and Economic development, human society life, activity in production constantly aggravate, and the Freshwater resources demand constantly increases, and water pollution simultaneously is serious day by day, makes shortage of fresh water progressively become global crisis.Utilizing desalting technology to waste water desalination utilization, is the feasible method of current solution shortage of water resources.For waste water desalination reuse, consider that the water that waste water itself brings pollutes, to the desalination producing water ratio with avoid secondary pollution to have relatively high expectations.
Present desalting technology mainly contains distillation method, ion exchange method, electrodialysis, electrodeionization, membrane processing method, electro-adsorption demineralization method etc.Distillation method is fit to waste heat occasions such as heat power plant because energy consumption is higher; Ion exchange method is usually used in smart desalination occasion because resin regeneration produces a large amount of acid-base waste fluids and causes secondary pollution; Though the electrodialysis technology is comparatively ripe, energy consumption is very high, present less application; The electricity technology that desalts is produced the quality height, need not soda acid, and it is refining to be fit to reverse osmosis produced water, is not suitable for former water desalination; Reverse osmosis (RO) is present most widely used and the most competitive desalting technology, and the aforementioned techniques cost is lower relatively, but producing water ratio is not high, and energy consumption is higher, and cost is also higher.
Summary of the invention
The object of the present invention is to provide a kind of less energy-consumption desalination process for waste water and device.The present invention is directed to energy consumption problem of higher in the existing waste water desalting method, proposed a kind of less energy-consumption desalination process for waste water and device.
The osmotic pressure that the present invention utilizes certain density Calcium hydrogen carbonate to produce, naturally osmotic draws the water molecules in the former water, calcium bicarbonate solution after the dilution adds slaked lime and obtains pure water and calcium carbonate emulsion, calcium carbonate emulsion is through obtaining the calcium bicarbonate solution of higher concentration after the carbonization, calcium bicarbonate solution turns back to forward osmosis as drawing liquid.
For reaching this purpose, the present invention by the following technical solutions:
A kind of less energy-consumption desalination process for waste water, described technology utilization calcium bicarbonate solution is as drawing liquid, and the water molecules in the waste water is drawn in infiltration; Add slaked lime in the calcium bicarbonate solution after obtaining diluting and obtain pure water and calcium carbonate emulsion; Calcium carbonate emulsion obtains calcium bicarbonate solution through after the carbonization, and described calcium bicarbonate solution returns as drawing liquid.
Described conduct is drawn the calcium bicarbonate solution concentration of liquid greater than raw material waste water total dissolved solid concentration.
The calcium bicarbonate solution concentration that liquid is drawn in described conduct is 10～120g/L, for example can select 10.02～119.6g/L, 14～110g/L, and 20.7～103.4g/L, 30～85.6g/L, 45～80g/L, 50.4～70g/L, 62.8g/L etc. are preferably 50g/L.
Described calcium carbonate emulsion is after dehydration, pyrolysis, and the carbon dioxide of generation pressurization back is used for carbonization; The solid that generates adds water digestion and obtains slaked lime, the slaked lime that obtains be used for dilution after calcium bicarbonate solution react.In actually operating, those skilled in the art can be with a part of calcium carbonate emulsion carbonization, and rest part dewaters, pyrolysis.
Described dehydration is belt press filtration or filter press dehydration.
Specifically, less energy-consumption desalination process for waste water of the present invention is:
Waste water at first enters the forward osmosis unit, and the liquid water outlet is drawn in the water formation of drawing in the liquid absorption waste water wherein, enters the neutralization reaction unit; Adding slaked lime in the neutralization reaction unit reacts; Reaction back mixed solution enters precipitation unit; Supernatant liquor in the precipitation unit enters filtering unit, filters out pure water and carries out reuse;
Part bed mud in the precipitation unit enters carbonation unit, and pressurization feeds carbonic acid gas and carries out carbonation reaction, and reacted liquid turns back to the forward osmosis unit after filtering as drawing liquid; Residue bed mud in the precipitation unit enters pyrolysis unit, dewaters earlier and afterwards carries out pyrolysis, and the carbon dioxide pressurization back of generation is used for carbonation unit, and the solid of generation adds water digestion and obtains slaked lime, and the slaked lime that obtains is used for the neutralization reaction unit and reacts.
The amount of substance of the slaked lime that adds in the neutralization reaction of the present invention unit is identical with the amount of substance of the described Calcium hydrogen carbonate that draws the liquid water outlet.
The present invention also provides a kind of device of desalination process for waste water as mentioned above of realizing, described device comprises forward osmosis unit, neutralization reaction unit, precipitation unit and the filtering unit that connects in turn; Described precipitation unit bottom connects carbonation unit; Described carbonation unit outlet is communicated with the forward osmosis unit.
Described precipitation unit bottom also connects pyrolysis unit.Described pyrolysis unit comprises dewatering unit and the pyrolysis oven of connection, and the pneumatic outlet of described pyrolysis oven is connected into carbonation unit, and solid outlet is connected into digestion reactor; The outlet of described digestion reactor is connected into the neutralization reaction unit.
Connect wastewater disposal basin before the described forward osmosis unit.Wastewater disposal basin is used for the waste water that enters the forward osmosis unit is carried out the adjusting of water quality, the water yield.
Described forward osmosis unit comprises waste water chamber, semipermeable partition and draws liquid chamber, waste water chamber and draw between the liquid chamber and separated by semipermeable partition.The liquid chamber top of drawing of described forward osmosis unit is connected with the calcium bicarbonate solution jar.
In described neutralization reaction unit, be provided with agitator, be used for accelerating to enter the high density carbonic acid hydrogen calcium solution of neutralization reaction unit and the reaction of slaked lime.
After connecting strainer, described carbonation unit outlet is connected into the forward osmosis unit.
The pneumatic outlet of described pyrolysis oven is connected into carbonation unit behind carbon dioxide compressor.
Further, the association reaction principle describes as follows to a kind of less energy-consumption desalination process for waste water of the present invention:
1) forward osmosis unit
In the forward osmosis unit, draw the calcium bicarbonate solution that liquid is 10～120g/L, its concentration is greater than raw material waste water total dissolved solid concentration.Under the osmotic pressure effect, the water molecules in the waste water is drawn enters calcium bicarbonate solution, and calcium bicarbonate solution is diluted; Waste water is concentrated the back and disposes or discharge as dense water.
2) neutralization reaction unit
In the neutralization reaction unit, add the slaked lime of equimolar amount in the calcium bicarbonate solution after the dilution, generate precipitation of calcium carbonate, thereby obtain the pure water after the desalination, react as follows:
Ca(HCO
3)
2+Ca(OH)
2→CaCO
3↓+2H
2O
3) precipitation unit
The reaction mixture that the neutralization reaction unit produces is mainly calcium carbonate suspension, enters precipitation unit.Because calcium carbonate density is bigger than water, progressively be deposited in the settling vessel bottom, thereby lower bottom mud calcium carbonate granule density is very high, calcium carbonate granule concentration is very low in the supernatant liquor on top.Supernatant liquor enters follow-up filtering unit.
4) filtering unit
Main component is the very little calcium carbonate granule of particle diameter and water in the supernatant liquor in the precipitation unit.After entering filtering unit, filter through sand-bed filter, obtain the very low reuse pure water of salinity.
5) carbonation unit
A part of bed mud in the precipitation unit (mainly being the top bed mud) enters carbonation unit.The bed mud main component is water and calcium carbonate, and carbonation reaction is carried out in pressurization, obtains calcium bicarbonate solution, reacts as follows:
CaCO
3+H
2O+CO
2→Ca(HCO
3)
2
6) pyrolysis unit
A part of bed mud in the precipitation unit (mainly being the bottom bed mud) enters pyrolysis unit, and the bed mud main component is water and calcium carbonate.At first carry out the dehydration of belt press filtration or filter press, obtain the lower calcium carbonate of water ratio, then thermal degradation.Decomposing the gas that produces is carbonic acid gas, turns back to carbonation unit and carries out carbonization, and the solid of generation is calcium oxide, and calcium oxide adds water digestion and generates slaked lime.Slaked lime is used for the neutralization reaction unit and precipitates Calcium hydrogen carbonate.React as follows:
CaCO
3→CaO+CO
2↑
CaO+H
2O→Ca(OH)
2
Compare with the prior art scheme, the present invention has following beneficial effect:
Among the present invention, permeable pressure head is spontaneous to enter calcium bicarbonate solution from waste water because water molecules utilizes, energy consumption is extremely low, only need to replenish certain slaked lime toward calcium bicarbonate solution, precipitin reaction is spontaneous to be carried out, can less energy-consumption obtain fresh water, and obtain the part calcium carbonate product, so preparation pure water process cost is very low.The total system energy consumption mainly consumes in the pyrolysis of a small amount of calcium carbonate, this process both can take full advantage of factory's heat energy or with other technologies couplings such as cement, also can directly import slaked lime, cut down the consumption of energy and cost.The present invention can also obtain high producing water ratio by regulation and control Calcium hydrogen carbonate concentration and waste water total dissolved solid concentration difference, has reduced contaminated wastewater.
Description of drawings
Fig. 1 is the described a kind of less energy-consumption desalination process for waste water device of the specific embodiment of the invention.
Among the figure: 1-forward osmosis unit; The 2-reaction member; The 3-precipitation unit; The 4-filtering unit; The 5-carbonation unit; The 6-pyrolysis unit; The 7-dewatering unit; The 8-pyrolysis oven; The 9-digestion reactor; The 10-wastewater disposal basin; 11-calcium bicarbonate solution jar; The 12-carbon dioxide compressor; 13-waste water; Waste water after 14-concentrates; 15-filters water outlet; The 16-carbon dioxide; The pyrogenous origin solid of 17-; The 18-lime hydrate emulsion.
Below the present invention is described in more detail.But following example only is simple and easy example of the present invention, does not represent or limit the scope of the present invention, and protection scope of the present invention is as the criterion with claims.
Embodiment
For the present invention is described better, be convenient to understand technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
As shown in Figure 1, a kind of less energy-consumption waste water desalting plant, described device comprise wastewater disposal basin 10, forward osmosis unit 1, neutralization reaction unit 2, precipitation unit 3 and the filtering unit 4 that connects in turn; Described precipitation unit 3 bottoms connect carbonation unit 5; Described carbonation unit 5 outlets are communicated with forward osmosis unit 2.
Described precipitation unit 3 bottoms also connect pyrolysis unit 6; Described pyrolysis unit 6 comprises dewatering unit 7 and the pyrolysis oven 8 of connection, and the pneumatic outlet of described pyrolysis oven 8 is connected into carbonation unit 5, and solid outlet is connected into digestion reactor 9; The outlet of described digestion reactor 9 is connected into neutralization reaction unit 2.
Described forward osmosis unit 1 comprises waste water chamber, semipermeable partition and draws liquid chamber, waste water chamber and draw between the liquid chamber and separated by semipermeable partition; The liquid chamber top of drawing of described forward osmosis unit 1 is connected with calcium bicarbonate solution jar 11;
After connecting strainer, described carbonation unit 5 outlets are connected into forward osmosis unit 1.
The pneumatic outlet of described pyrolysis oven 8 is connected into carbonation unit 5 behind carbon dioxide compressor 12.
Embodiment 1
The advanced treatment object is the coking chemical waste water after carrying out a biological disposal upon, TDS(total dissolved solid in the waste water) be about 1000mg/L.
Waste water 13 at first enters forward osmosis unit 1; The calcium bicarbonate solution that draws liquid employing 50g/L of forward osmosis unit 1, behind forward osmosis unit 1, waste water is concentrated to about 10g/L, and producing water ratio is 90%, and the waste water 14 after concentrating effluxes or disposes; Calcium bicarbonate solution behind the absorption moisture enters neutralization reaction unit 2, adds in the neutralization reaction unit 2 with the equimolar slaked lime of Calcium hydrogen carbonate (from follow-up pyrolysis unit 6, small part is replenished) to react, and mixed solution enters post precipitation unit 3 after the reaction; Supernatant liquor in the precipitation unit 3 enters follow-up filtering unit 4, filters water outlet 15 and carries out reuse;
Part bed mud in the precipitation unit 3 enters carbonation unit 5, and pressurization feeds carbonic acid gas and carries out carbonation reaction, and reacted liquid turns back to forward osmosis unit 1 after filtering as drawing liquid; The residue bed mud of precipitation unit 3 enters pyrolysis unit 6, earlier through carrying out pyrolysis after the dehydration, the carbon dioxide 16 pressurization backs that pyrolysis produces are used for carbonation unit 5, pyrogenous origin solid 17 adds water digestion and obtains lime hydrate emulsion 18, and lime hydrate emulsion 18 turns back to neutralization reaction unit 2 and is used for the precipitation Calcium hydrogen carbonate.
The advanced treatment object is the municipal wastewater after carrying out a biological disposal upon, TDS(total dissolved solid in the waste water) be about 500mg/L.
Waste water 13 at first enters forward osmosis unit 1; The calcium bicarbonate solution that draws liquid employing 10g/L of forward osmosis unit 1, behind forward osmosis unit 1, waste water is concentrated to about 6g/L, and producing water ratio is 92%, and the waste water 14 after concentrating effluxes or disposes; Calcium bicarbonate solution behind the absorption moisture enters neutralization reaction unit 2, adds in the neutralization reaction unit 2 with the equimolar slaked lime of Calcium hydrogen carbonate (from follow-up pyrolysis unit 6, small part is replenished) to react, and mixed solution enters post precipitation unit 3 after the reaction; Supernatant liquor in the precipitation unit 3 enters follow-up filtering unit 4, filters water outlet 15 and carries out reuse;
Part bed mud in the precipitation unit 3 enters carbonation unit 5, and pressurization feeds carbonic acid gas and carries out carbonation reaction, and reacted liquid turns back to forward osmosis unit 1 after filtering as drawing liquid; The residue bed mud of precipitation unit 3 enters pyrolysis unit 6, earlier through carrying out pyrolysis after the dehydration, the carbon dioxide 16 pressurization backs that pyrolysis produces are used for carbonation unit 5, pyrogenous origin solid 17 adds water digestion and obtains lime hydrate emulsion 18, and lime hydrate emulsion 18 turns back to neutralization reaction unit 2 and is used for the precipitation Calcium hydrogen carbonate.
Embodiment 3
The advanced treatment object is the strong brine of reverse osmosis desalination water station, TDS(total dissolved solid in the waste water) be about 8000mg/L.
Waste water 13 at first enters forward osmosis unit 1; The calcium bicarbonate solution that draws liquid employing 120g/L of forward osmosis unit 1, behind forward osmosis unit 1, waste water is concentrated to about 48g/L, and producing water ratio is 83%, and the waste water 14 after concentrating effluxes or disposes; Calcium bicarbonate solution behind the absorption moisture enters neutralization reaction unit 2, adds in the neutralization reaction unit 2 with the equimolar slaked lime of Calcium hydrogen carbonate (from follow-up pyrolysis unit 6, small part is replenished) to react, and mixed solution enters post precipitation unit 3 after the reaction; Supernatant liquor in the precipitation unit 3 enters follow-up filtering unit 4, filters water outlet 15 and carries out reuse;
Part bed mud in the precipitation unit 4 enters carbonation unit 5, and pressurization feeds carbonic acid gas and carries out carbonation reaction, and reacted liquid turns back to forward osmosis unit 1 after filtering as drawing liquid; The residue bed mud of precipitation unit 3 enters pyrolysis unit 6, earlier through carrying out pyrolysis after the dehydration, the carbon dioxide 16 pressurization backs that pyrolysis produces are used for carbonation unit, pyrogenous origin solid 17 adds water digestion and obtains lime hydrate emulsion 18, and lime hydrate emulsion 18 turns back to neutralization reaction unit 2 and is used for the precipitation Calcium hydrogen carbonate.
Applicant's statement, the present invention illustrates detailed construction feature of the present invention and processing method by above-described embodiment, but the present invention is not limited to above-mentioned detailed construction feature and processing method, does not mean that namely the present invention must rely on above-mentioned detailed construction feature and processing method could be implemented.The person of ordinary skill in the field should understand, any improvement in the present invention to the increase of the equivalence replacement of the selected parts of the present invention and accessory, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (10)
1. a less energy-consumption desalination process for waste water is characterized in that, described technology utilization calcium bicarbonate solution is as drawing liquid, and the water molecules in the waste water is drawn in infiltration; Add slaked lime in the calcium bicarbonate solution after obtaining diluting and obtain pure water and calcium carbonate emulsion; Described calcium carbonate emulsion obtains calcium bicarbonate solution through after the carbonization, and described calcium bicarbonate solution returns as drawing liquid.
2. desalination process for waste water as claimed in claim 1 is characterized in that, described conduct is drawn the calcium bicarbonate solution concentration of liquid greater than raw material waste water total dissolved solid concentration.
3. desalination process for waste water as claimed in claim 1 or 2 is characterized in that, the calcium bicarbonate solution concentration that liquid is drawn in described conduct is 10～120g/L, is preferably 50g/L.
4. as the described desalination process for waste water of one of claim 1-3, it is characterized in that described calcium carbonate emulsion is after dehydration, pyrolysis, the carbon dioxide of generation pressurization back is used for carbonization; The solid that generates adds water digestion and obtains slaked lime, the slaked lime that obtains be used for dilution after calcium bicarbonate solution react.
5. desalination process for waste water as claimed in claim 4 is characterized in that, described dehydration is belt press filtration or filter press dehydration.
6. as the described desalination process for waste water of one of claim 1-5, it is characterized in that waste water at first enters forward osmosis unit (1), the liquid water outlet is drawn in the water formation of drawing in the liquid absorption waste water wherein, enters neutralization reaction unit (2); React to neutralization reaction unit (2) middle slaked lime that adds; Reaction back mixed solution enters precipitation unit (3); Supernatant liquor in the precipitation unit (3) enters filtering unit (4), filters out pure water and carries out reuse;
Part bed mud in the precipitation unit (3) enters carbonation unit (5), and pressurization feeds carbonic acid gas and carries out carbonation reaction, and reacted liquid turns back to the forward osmosis unit after filtering as drawing liquid; Residue bed mud in the precipitation unit (3) enters pyrolysis unit (6), dewater earlier and afterwards carry out pyrolysis, the carbon dioxide pressurization back that produces is used for carbonation unit (5), and the solid of generation adds water digestion and obtains slaked lime, and the slaked lime that obtains is used for neutralization reaction unit (2) and reacts.
7. desalination process for waste water as claimed in claim 6 is characterized in that, the amount of substance of the slaked lime that adds in the described neutralization reaction unit (2) is identical with the amount of substance of the described Calcium hydrogen carbonate that draws the liquid water outlet.
8. a realization is characterized in that as the device of desalination process for waste water as described in one of claim 1-7 described device comprises forward osmosis unit (1), neutralization reaction unit (2), precipitation unit (3) and the filtering unit (4) that connects in turn; Described precipitation unit (3) bottom connects carbonation unit (5); Described carbonation unit (5) outlet is communicated with forward osmosis unit (2).
9. device as claimed in claim 8 is characterized in that, described precipitation unit (3) bottom also connects pyrolysis unit (6);
Preferably, described pyrolysis unit (6) comprises dewatering unit (7) and the pyrolysis oven (8) of connection, and the pneumatic outlet of described pyrolysis oven (8) is connected into carbonation unit (5), and solid outlet is connected into digestion reactor (9); The outlet of described digestion reactor (9) is connected into neutralization reaction unit (2).
10. install as claimed in claim 8 or 9, it is characterized in that described forward osmosis unit (1) connects wastewater disposal basin (10) before;
Preferably, described forward osmosis unit (1) comprises waste water chamber, semipermeable partition and draws liquid chamber, waste water chamber and draw between the liquid chamber and separated by semipermeable partition; The liquid chamber top of drawing of described forward osmosis unit (1) is connected with calcium bicarbonate solution jar (11);
Preferably, be connected into forward osmosis unit (1) after described carbonation unit (5) outlet connects strainer;
Preferably, the pneumatic outlet of described pyrolysis oven (8) is connected into carbonation unit (5) behind carbon dioxide compressor (12).
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| CN113277544A (en) * | 2021-06-11 | 2021-08-20 | 浙江亚厦装饰股份有限公司 | Method for preparing color master batch by using dicyandiamide waste residues |
| CN118221236A (en) * | 2024-04-08 | 2024-06-21 | 江苏鑫林环保设备有限公司 | A kind of mixed salt thermal oxidation equipment and method for coking wastewater treatment |
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Denomination of invention: A low-energy consumption desalination process for wastewater and an apparatus thereof Effective date of registration: 20190611 Granted publication date: 20150408 Pledgee: Xinjiang Tianyu Coal Chemical Group Co., Ltd. Pledgor: Beijing SaiKe Kanglun Environmental Science & Technology Co., Ltd. Registration number: 2019990000543 |
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