CN110104851A - One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method - Google Patents
One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method Download PDFInfo
- Publication number
- CN110104851A CN110104851A CN201910480083.1A CN201910480083A CN110104851A CN 110104851 A CN110104851 A CN 110104851A CN 201910480083 A CN201910480083 A CN 201910480083A CN 110104851 A CN110104851 A CN 110104851A
- Authority
- CN
- China
- Prior art keywords
- unit
- water
- enters
- high density
- softening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/07—Preparation from the hydroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses one kind to be used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method, and waste water is first carried out level-one softening removal Mg by this method2+And heavy metal ion, level-one soften mud mixture and enter the first high density precipitation unit, obtained supernatant enters secondary softening unit removal Ca2+Secondary softening mud mixture is precipitated into the second high density precipitation unit, supernatant is handled by membranous system, obtained fresh water circulating and recovering, the concentrated water of generation enters chelating resin unit, depth goes removing calcium and magnesium and heavy metal ion, and water outlet enters bipolar membrane electrodialysis unit, and it is 10% sodium hydroxide solution and 8% hydrochloric acid solution that processing, which obtains concentration,;The method achieve recycling for magnesium hydroxide slurry, the usage amount of flue gas desulfurization oxidation magnesium is greatly reduced, soda acid technique is produced using bipolar membrane electrodialysis, while preparing soda ash using carbon dioxide in power-plant flue gas, the resource utilization of salt in waste water is realized, softens medicament without outsourcing.
Description
Technical field
The invention belongs to sewage advanced treatment fields, more particularly to one kind to be used for the zero-emission of magnesium oxide method power plant desulfurization wastewater
Processing method.
Background technique
The Cl mainly having in the desulfurization wastewater that thermal power plant's magnesium oxide method desulfurization generates containing ion-、SO42-、Na+、Mg2+、
Ca2+, especially Mg2+Content is higher, is typical with high salt, high rigidity waste water.Currently, domestic and international Desulphurization for Coal-fired Power Plant waste water zero
Discharge project mostly uses greatly " softening+film concentration+evaporative crystallization " process route.When the above zero-emission project operation, using hydrogen-oxygen
The mode for changing the dosing of calcium+soda ash softens, and can generate a large amount of magnesium hydroxide and calcium carbonate mixing sludge, current method of disposal
It is that will be filled after above-mentioned mixing sludge filter-press dehydration, since waste water Mg and Ca content is higher, generation sludge quantity is larger, processing cost
It is high.The salt of output in vapo(u)rization system, main component are sodium chloride and sodium sulphate, and salt-mixture does not have market that can dissolve, Zhi Nengzuo
For fixed-end forces;Sodium chloride and sodium sulphate index after dividing salt are also difficult to meet market demands, and value of the product is low.
It can be seen that current desulfurization wastewater technique of zero discharge solves only discharge of wastewater problem, generated in treatment process
A large amount of solid wastes, system operation cost is not only significantly increased, but also resource is not utilized rationally.
Summary of the invention
In view of the above-mentioned problems, the present invention provides one kind to be used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method,
Even more a kind of recycling processing method, the processing method by softening, high density precipitating, film processing system and chelating resin and
Bipolar membrane electrodialysis combines, and coordinates mutually, finally not only realizes the zero-emission of waste water, and realize the reasonable benefit of resource
With.
To achieve this purpose, the present invention adopts the following technical scheme:
One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method, which is characterized in that the waste water is first carried out one
Grade softening removal Mg2+ and heavy metal ion, level-one soften mud mixture and enter the first high density precipitation unit, and what is obtained is upper
Clear liquid enters secondary softening unit removal Ca2+, and secondary softening mud mixture is precipitated into the second high density precipitation unit, on
Clear liquid is handled by membranous system, and obtained fresh water circulating and recovering, the concentrated water of generation enters chelating resin unit, and depth removes removing calcium and magnesium
And heavy metal ion, water outlet enter Bipolar Membrane
The film processing system includes sequentially connected ultrafiltration, nanofiltration and film upgrading unit.
The film upgrading unit includes one or both of reverse osmosis, electrodialysis combination.
Level-one softening adds sodium hydroxide solution, NaOH solution and Mg2+Molar ratio be 2:1-3:1, residence time 10-
30min。
Level-one softens mud mixture and precipitates into the first high density precipitation unit, obtained Mg(OH)2Sediment slurry is returned
For flue gas desulfurization, the sulfur dioxide in power-plant flue gas, sedimentation time 2h-5h are absorbed.
First high density precipitating supernatant enters secondary softening unit, adds sodium carbonate liquor, Na2CO3Solution and Ca2+'s
Molar ratio is 1:1-1.5:1, residence time 10-30min.
Secondary softening mud mixture enters the second high density precipitation unit, obtained CaCO3Sludge enters Treatment of Sludge
Unit, sedimentation time 2h-5h.
PH is adjusted to enter film process system after 7-8 by the water outlet of the second high density precipitation unit supernatant by adding hydrochloric acid solution
System.
Into after film processing system, the NF concentrated water reuse rich in sodium sulphate generated by nanofiltration is generated in flue gas desulfurization
Enter film upgrading unit rich in sodium chloride fresh water;The fresh water that the film upgrading unit generates as recirculated water reuse, generation it is dense
Water enters chelating resin unit, and depth goes the heavy metal ion such as removing calcium and magnesium, uses the sum of water heavy metal ion < 0.1mg/L.
Chelating resin water outlet enters bipolar membrane electrodialysis unit, and preparing concentration is 10% sodium hydroxide solution and 8% hydrochloric acid
Solution;The sodium hydroxide solution can be back to level-one pliable cell and secondary softening unit or be used to prepare soda ash.
Compared with prior art, the invention has the following advantages:
(1) the invention discloses magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method, this method is realized by fractional precipitation
Recycling for magnesium hydroxide slurry, is greatly reduced the usage amount of flue gas desulfurization oxidation magnesium, effectively reduces at power-plant flue gas
Manage cost;
(2) soda acid technique is produced using bipolar membrane electrodialysis, realizes the money for realizing salt in waste water while power plant effluent zero-emission
Sourceization utilizes, and produced soda acid reuse is used for water treatment system, while preparing soda ash using carbon dioxide in power plant's flue gas, is not necessarily to
Outsourcing softens medicament, effectively reduces cost for wastewater treatment.
Detailed description of the invention
Fig. 1 is magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method flow chart of the present invention.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, of the invention is typical but non-limiting
Embodiment it is as follows:
As shown in Figure 1, a kind of be used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method, waste water is first subjected to level-one softening
Remove Mg2+ and heavy metal ion, level-one softens mud mixture and enters the first high density precipitation unit, obtained supernatant into
Enter secondary softening unit removal Ca2+, secondary softening mud mixture precipitates into the second high density precipitation unit, and supernatant passes through
Membranous system processing, obtained fresh water circulating and recovering, the concentrated water of generation enter chelating resin unit, and depth removes removing calcium and magnesium and heavy metal
Ion, water outlet enter bipolar membrane electrodialysis unit, and it is 10% sodium hydroxide solution and 8% hydrochloric acid solution that processing, which obtains concentration,.
Wherein, film processing system includes sequentially connected ultrafiltration, nanofiltration and film upgrading unit, and film upgrading unit includes reverse osmosis
Thoroughly, one or both of electrodialysis is combined;Level-one, which softens, adds sodium hydroxide solution, and the molar ratio of NaOH solution and Mg2+ are
2:1-3:1, that is, 2:1,2.1:1,2.2:1,2.3:1,2.4:1,2.5:1,2.6:1,2.7:1,2.8:1,2.9:1,3:1, when stop
Between be 10-30min, i.e. 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min,
20min、21min、22min、23min、24min、25min、26min、27min、28min、29min、30min。
Level-one softens mud mixture and precipitates into the first high density precipitation unit, obtained Mg(OH)2Sediment slurry is returned
For flue gas desulfurization, the sulfur dioxide in power-plant flue gas, sedimentation time 2h-5h, 2h, 3h, 4h, 5h are absorbed.
First high density precipitating supernatant enters secondary softening unit, adds sodium carbonate liquor, sodium carbonate liquor derives from
Soda ash preparation unit in system, Na2CO3Solution and Ca2+Molar ratio be 1:1-1.5:1,1.1:1,1.2:1,1.3:1,1.4:
1,1.5:1, residence time 10-30min, 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min,
18min、19min、20min、21min、22min、23min、24min、25min、26min、27min、28min、29min、
30min。
Secondary softening mud mixture enters the second high density precipitation unit, obtained CaCO3Sludge enters Treatment of Sludge
Unit, sedimentation time 2h-5h, 2h, 3h, 4h, 5h.
PH is adjusted to enter film process system after 7-8 by the water outlet of the second high density precipitation unit supernatant by adding hydrochloric acid solution
System.
Into after film processing system, the NF concentrated water reuse rich in sodium sulphate generated by nanofiltration is generated in flue gas desulfurization
Enter film upgrading unit rich in sodium chloride fresh water;The fresh water that the film upgrading unit generates as recirculated water reuse, generation it is dense
Water enters chelating resin unit, and depth goes the heavy metal ion such as removing calcium and magnesium, uses the sum of water heavy metal ion < 0.1mg/L.
Chelating resin water outlet enters bipolar membrane electrodialysis unit, and preparing concentration is 10% sodium hydroxide solution and 8% hydrochloric acid
Solution;Wherein sodium hydroxide solution can be back to level-one pliable cell and secondary softening unit or be used to prepare soda ash.
Embodiment 1
Certain magnesium oxide method power plant desulfurization wastewater water quality is as shown in table 1, unit, mg/L
Waste water initially enters level-one pliable cell, adds a large amount of Mg in sodium hydroxide solution and water2+Generate Mg(OH)2Precipitating,
Micro other heavy metal ion such as Cu, As, Pb etc. in water removal are removed simultaneously, and sodium hydroxide is from Bipolar Membrane electric osmose in system
Unit is analysed, wherein NaOH and Mg2+Molar ratio be 2:1, residence time 20min.
Level-one softening mud mixture enters high density precipitation unit precipitating, obtained Mg(OH)2Sediment slurry is back to
Flue gas desulfurization absorbs the sulfur dioxide in power-plant flue gas, sedimentation time 3h, high density precipitating water outlet Mg2+It is reduced to 20mg/L
Below.
High density precipitating supernatant enters secondary softening unit, adds the Ca in sodium carbonate liquor and water2+Generate CaCO3It is heavy
It forms sediment, sodium carbonate derives from soda ash preparation unit in system, wherein Na2CO3With Ca2+Molar ratio be 1:1, the residence time is
20min。
Secondary softening mud mixture enters high density precipitation unit precipitating, obtained CaCO3Sludge enters Treatment of Sludge
Unit, sedimentation time 4h, potassium permanganate composites are discharged Ca2+ 30mg/L or less.
High density precipitating supernatant water outlet adjusts ph to 7-8 by adding hydrochloric acid, goes into ultrafiltration system outstanding in water removal
After floating object, colloid, divide salt into nanofiltration system.Hydrochloric acid used is the hydrochloric acid that the bipolar membrane electrodialysis unit in system generates.
For the NF concentrated water reuse rich in sodium sulphate that nanofiltration generates in flue gas desulfurization, nanofiltration, which is generated, enters film rich in sodium chloride fresh water
Upgrading unit.The film upgrading unit is concentrated using high pressure reverse osmosis process.
The fresh water that film concentration generates is as recirculated water reuse, and the concentrated water sodium chloride content of generation is 13%, into chelating resin
Unit goes the heavy metal ion such as removing calcium and magnesium, out the sum of water heavy metal ion < 0.1mg/L.
Chelating resin water outlet enters bipolar membrane electrodialysis unit, and preparing concentration is about 10% sodium hydroxide solution and 8% salt
Acid solution.
Sodium hydroxide solution a part is back to level-one pliable cell and for Membrane cleaning, and it is single that a part enters soda ash preparation
Member, the soda ash preparation unit are passed through after processing rich in CO2Power-plant flue gas, control CO2Molar ratio with NaOH is 1:2, raw
At sodium carbonate liquor.Hydrochloric acid solution be back to potassium permanganate composites water outlet after secondary softening adjust ph to it is neutral and for film it is clear
It washes.
Embodiment 2
Certain magnesium oxide method power plant desulfurization wastewater water quality is as shown in table 1, unit, mg/L
Waste water initially enters level-one pliable cell, adds a large amount of Mg in sodium hydroxide solution and water2+Generate Mg(OH)2Precipitating,
Micro other heavy metal ion such as Cu, As, Pb etc. in water removal are removed simultaneously, and sodium hydroxide is from Bipolar Membrane electric osmose in system
Unit is analysed, wherein NaOH and Mg2+Molar ratio be 2.5:1, residence time 30min.
Level-one softening mud mixture enters high density precipitation unit precipitating, obtained Mg(OH)2Sediment slurry is back to
Flue gas desulfurization absorbs the sulfur dioxide in power-plant flue gas, sedimentation time 4h, high density precipitating water outlet Mg2+It is reduced to 20mg/L
Below.
High density precipitating supernatant enters secondary softening unit, adds the Ca in sodium carbonate liquor and water2+Generate CaCO3It is heavy
It forms sediment, sodium carbonate derives from soda ash preparation unit in system, wherein Na2CO3With Ca2+Molar ratio be 1:1, the residence time is
30min。
Secondary softening mud mixture enters high density precipitation unit precipitating, obtained CaCO3Sludge enters Treatment of Sludge
Unit, sedimentation time 5h, potassium permanganate composites are discharged Ca2+ 30mg/L or less.
High density precipitating supernatant water outlet adjusts ph to 7-8 by adding hydrochloric acid, goes into ultrafiltration system outstanding in water removal
After floating object, colloid, divide salt into nanofiltration system.Hydrochloric acid used is the hydrochloric acid that the bipolar membrane electrodialysis unit in system generates.
For the NF concentrated water reuse rich in sodium sulphate that nanofiltration generates in flue gas desulfurization, nanofiltration, which is generated, enters film rich in sodium chloride fresh water
Upgrading unit.The film upgrading unit is reverse osmosis using high pressure and electrodialysis group technology is concentrated.
The fresh water that film concentration generates is as recirculated water reuse, and the concentrated water sodium chloride content of generation is 15%, into chelating resin
Unit goes the heavy metal ion such as removing calcium and magnesium, out the sum of water heavy metal ion < 0.1mg/L.
Chelating resin water outlet enters bipolar membrane electrodialysis unit, and preparing concentration is about 10% sodium hydroxide solution and 8% salt
Acid solution.
Sodium hydroxide solution a part is back to level-one pliable cell and for Membrane cleaning, and it is single that a part enters soda ash preparation
Member, the soda ash preparation unit are passed through after processing rich in CO2Power-plant flue gas, control CO2Molar ratio with NaOH is 1:2, raw
At sodium carbonate liquor.Hydrochloric acid solution be back to potassium permanganate composites water outlet after secondary softening adjust ph to it is neutral and for film it is clear
It washes.
Embodiment 3
Certain magnesium oxide method power plant desulfurization wastewater water quality is as shown in table 1, unit, mg/L
Waste water initially enters level-one pliable cell, adds a large amount of Mg in sodium hydroxide solution and water2+Generate Mg(OH)2Precipitating,
Micro other heavy metal ion such as Cu, As, Pb etc. in water removal are removed simultaneously, and sodium hydroxide is from Bipolar Membrane electric osmose in system
Unit is analysed, wherein NaOH and Mg2+Molar ratio be 3:1, residence time 30min.
Level-one softening mud mixture enters high density precipitation unit precipitating, obtained Mg(OH)2Sediment slurry is back to
Flue gas desulfurization absorbs the sulfur dioxide in power-plant flue gas, sedimentation time 4h, high density precipitating water outlet Mg2+It is reduced to 20mg/L
Below.
High density precipitating supernatant enters secondary softening unit, adds the Ca in sodium carbonate liquor and water2+Generate CaCO3It is heavy
It forms sediment, sodium carbonate derives from soda ash preparation unit in system, wherein Na2CO3With Ca2+Molar ratio be 1.2:1, the residence time is
30min。
Secondary softening mud mixture enters high density precipitation unit precipitating, obtained CaCO3Sludge enters Treatment of Sludge
Unit, sedimentation time 5h, potassium permanganate composites are discharged Ca2+30mg/L or less.
High density precipitating supernatant water outlet adjusts ph to 7-8 by adding hydrochloric acid, goes into ultrafiltration system outstanding in water removal
After floating object, colloid, divide salt into nanofiltration system.Hydrochloric acid used is the hydrochloric acid that the bipolar membrane electrodialysis unit in system generates.
For the NF concentrated water reuse rich in sodium sulphate that nanofiltration generates in flue gas desulfurization, nanofiltration, which is generated, enters film rich in sodium chloride fresh water
Upgrading unit.The film upgrading unit is reverse osmosis using high pressure and electrodialysis group technology is concentrated.
The fresh water that film concentration generates is as recirculated water reuse, and the concentrated water sodium chloride content of generation is 18%, into chelating resin
Unit goes the heavy metal ion such as removing calcium and magnesium, out the sum of water heavy metal ion < 0.1mg/L.
Chelating resin water outlet enters bipolar membrane electrodialysis unit, and preparing concentration is about 10% sodium hydroxide solution and 8% salt
Acid solution.
Sodium hydroxide solution a part is back to level-one pliable cell and for Membrane cleaning, and it is single that a part enters soda ash preparation
Member, the soda ash preparation unit are passed through after processing rich in CO2Power-plant flue gas, control CO2Molar ratio with NaOH is 1:2, raw
At sodium carbonate liquor.Hydrochloric acid solution be back to potassium permanganate composites water outlet after secondary softening adjust ph to it is neutral and for film it is clear
It washes.
The Applicant declares that the present invention is explained by the above embodiments method detailed of the invention, but the present invention not office
Be limited to above-mentioned method detailed, that is, do not mean that the invention must rely on the above detailed methods to implement.Technical field
Technical staff it will be clearly understood that any improvement in the present invention, equivalence replacement and auxiliary element to each raw material of product of the present invention
Addition, selection of concrete mode etc., all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. one kind is used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method, which is characterized in that first carry out the waste water
Level-one softening removal Mg2+And heavy metal ion, level-one soften mud mixture and enter the first high density precipitation unit, what is obtained is upper
Clear liquid enters secondary softening unit removal Ca2+, secondary softening mud mixture into the second high density precipitation unit precipitate, supernatant
Liquid is handled by membranous system, obtained fresh water circulating and recovering, and the concentrated water of generation enters chelating resin unit, depth go removing calcium and magnesium and
Heavy metal ion, water outlet enter bipolar membrane electrodialysis unit, and it is that 10% sodium hydroxide solution and 8% hydrochloric acid are molten that processing, which obtains concentration,
Liquid.
2. processing method as described in claim 1, which is characterized in that the film processing system include sequentially connected ultrafiltration,
Nanofiltration and film upgrading unit.
3. processing method as claimed in claim 2, which is characterized in that the film upgrading unit includes in reverse osmosis, electrodialysis
One or two kinds of combinations.
4. processing method as claimed in claim 3, which is characterized in that level-one softening adds sodium hydroxide solution, NaOH solution
With Mg2+Molar ratio be 2:1-3:1, residence time 10-30min.
5. processing method as claimed in claim 4, which is characterized in that it is heavy into the first high density that level-one softens mud mixture
Shallow lake unit precipitating, obtained Mg(OH)2Sediment slurry is back to flue gas desulfurization, absorbs the sulfur dioxide in power-plant flue gas, precipitating
Time is 2h-5h.
6. processing method as claimed in claim 5, which is characterized in that the first high density precipitating supernatant enters secondary softening list
Member adds sodium carbonate liquor, Na2CO3Solution and Ca2+Molar ratio be 1:1-1.5:1, residence time 10-30min.
7. processing method as claimed in claim 6, which is characterized in that secondary softening mud mixture is heavy into the second high density
Shallow lake unit, obtained CaCO3Sludge enters sludge treating block, sedimentation time 2h-5h.
8. processing method as claimed in claim 7, which is characterized in that the water outlet of the second high density precipitation unit supernatant passes through throwing
Enter film processing system after adding hydrochloric acid solution that pH is adjusted to 7-8.
9. processing method as claimed in claim 8, which is characterized in that after entering film processing system, generated by nanofiltration
NF concentrated water reuse rich in sodium sulphate generates in flue gas desulfurization and enters film upgrading unit rich in sodium chloride fresh water;The film concentration is single
For the fresh water that member generates as recirculated water reuse, the concentrated water of generation enters chelating resin unit, depth go the heavy metals such as removing calcium and magnesium from
Son uses the sum of water heavy metal ion < 0.1mg/L.
10. processing method as claimed in claim 9, which is characterized in that chelating resin water outlet enters bipolar membrane electrodialysis unit,
Preparing concentration is 10% sodium hydroxide solution and 8% hydrochloric acid solution;The sodium hydroxide solution can be back to level-one pliable cell
With secondary softening unit or be used to prepare soda ash.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910480083.1A CN110104851A (en) | 2019-06-04 | 2019-06-04 | One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910480083.1A CN110104851A (en) | 2019-06-04 | 2019-06-04 | One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method |
Publications (1)
Publication Number | Publication Date |
---|---|
CN110104851A true CN110104851A (en) | 2019-08-09 |
Family
ID=67493840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201910480083.1A Pending CN110104851A (en) | 2019-06-04 | 2019-06-04 | One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN110104851A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110422965A (en) * | 2019-08-26 | 2019-11-08 | 中国石油化工股份有限公司 | The processing method and processing system of flue gas desulfurization waste-water and application |
CN110746008A (en) * | 2019-10-29 | 2020-02-04 | 南京友智科技有限公司 | Wastewater treatment system |
CN111039488A (en) * | 2020-01-06 | 2020-04-21 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater recycling treatment system and treatment method |
CN111099778A (en) * | 2019-12-04 | 2020-05-05 | 江苏京源环保股份有限公司 | Bipolar membrane electrodialysis recycling treatment process applied to high-salinity wastewater |
CN111499075A (en) * | 2020-05-14 | 2020-08-07 | 北京中科康仑环境科技研究院有限公司 | Zero-emission treatment system and treatment method for salt-containing wastewater |
CN112479421A (en) * | 2020-11-10 | 2021-03-12 | 西安西热水务环保有限公司 | High-hardness wastewater softening and resource recycling system and method |
CN113461237A (en) * | 2021-07-27 | 2021-10-01 | 江苏海容热能环境工程有限公司 | Zero discharge system for salt wastewater treatment |
US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
CN116891242A (en) * | 2023-09-11 | 2023-10-17 | 杭州科膜水处理工程有限公司 | Treatment method for short-process treatment of industrial waste salt |
US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105254084A (en) * | 2015-11-13 | 2016-01-20 | 北京国电富通科技发展有限责任公司 | Desulfurization waste water bipolar membrane electrodialysis treatment method and device |
CN109133440A (en) * | 2017-06-28 | 2019-01-04 | 北京朗新明环保科技有限公司 | A kind of desulfurization wastewater zero-discharge treatment system and technique |
-
2019
- 2019-06-04 CN CN201910480083.1A patent/CN110104851A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105254084A (en) * | 2015-11-13 | 2016-01-20 | 北京国电富通科技发展有限责任公司 | Desulfurization waste water bipolar membrane electrodialysis treatment method and device |
CN109133440A (en) * | 2017-06-28 | 2019-01-04 | 北京朗新明环保科技有限公司 | A kind of desulfurization wastewater zero-discharge treatment system and technique |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110422965A (en) * | 2019-08-26 | 2019-11-08 | 中国石油化工股份有限公司 | The processing method and processing system of flue gas desulfurization waste-water and application |
CN110746008A (en) * | 2019-10-29 | 2020-02-04 | 南京友智科技有限公司 | Wastewater treatment system |
CN111099778A (en) * | 2019-12-04 | 2020-05-05 | 江苏京源环保股份有限公司 | Bipolar membrane electrodialysis recycling treatment process applied to high-salinity wastewater |
CN111039488A (en) * | 2020-01-06 | 2020-04-21 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater recycling treatment system and treatment method |
CN111499075A (en) * | 2020-05-14 | 2020-08-07 | 北京中科康仑环境科技研究院有限公司 | Zero-emission treatment system and treatment method for salt-containing wastewater |
CN112479421A (en) * | 2020-11-10 | 2021-03-12 | 西安西热水务环保有限公司 | High-hardness wastewater softening and resource recycling system and method |
CN113461237A (en) * | 2021-07-27 | 2021-10-01 | 江苏海容热能环境工程有限公司 | Zero discharge system for salt wastewater treatment |
US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
US11563229B1 (en) | 2022-05-09 | 2023-01-24 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
US11611099B1 (en) | 2022-05-09 | 2023-03-21 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
US11699803B1 (en) | 2022-05-09 | 2023-07-11 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
CN116891242A (en) * | 2023-09-11 | 2023-10-17 | 杭州科膜水处理工程有限公司 | Treatment method for short-process treatment of industrial waste salt |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN110104851A (en) | One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method | |
CN105502782B (en) | A kind of coal chemical industry coking wastewater water resource and salt recovery process | |
CN105645439B (en) | A kind of system and its technique that potassium sulfate is prepared using high saliferous industrial wastewater | |
CN105060545B (en) | A kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water | |
CN106430786B (en) | Desulfurization wastewater treatment method and device | |
CN105439341B (en) | A kind of brine waste processing system and processing method | |
CN108623050A (en) | A kind of processing method and processing system of desulfurization wastewater | |
CN107651774A (en) | Coal chemical industry strong brine silicon removing process and its special purpose device | |
CN206051746U (en) | A kind of processing system of Coastal Power Station fire coal boiler fume wet desulphurization waste water | |
CN106517598A (en) | Treating method and treating device for zero discharging of desulfurization wastewater | |
CN105621776A (en) | Treatment method for coal boiler fuel gas wet desulfurization wastewater | |
CN107915354A (en) | A kind of desulfurization wastewater zero-emission and resource utilization device and method | |
CN108178408A (en) | A kind of device and method of desulfurization wastewater processing | |
CN105523666A (en) | Strengthened pretreatment system for high-salt-content industrial wastewater and production process of strengthened pretreatment system | |
CN103936191B (en) | Zero discharge treatment method for wastewater of lead-acid battery | |
CN207361950U (en) | The special purpose device of coal chemical industry strong brine silicon removing process | |
CN103936190B (en) | Barium hydroxide treatment method with zero discharging of lead-acid storage battery wastewater | |
CN108862729A (en) | A kind of method of chlor-alkali salt sludge sub-prime recycling comprehensive utilization | |
CN105948353A (en) | Zero-emission membrane treatment system for separating mud and salt from desulfurization wastewater and process thereof | |
CN105347592A (en) | Recycling zero-emission treatment process for desulfurization wastewater | |
CN105906129A (en) | Method for reutilization of water resources and transformation and utilization of salt in waste water | |
CN107055885A (en) | A kind of Desulphurization for Coal-fired Power Plant waste water reclaiming system and method for work | |
CN109205876A (en) | A kind for the treatment of method and apparatus of desulfurization wastewater | |
CN207726913U (en) | A kind of device of desulfurization wastewater processing | |
CN111762954A (en) | High-salt-content wastewater treatment method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination |