CN109354238A - The method and its processing unit of hardness in multistep combined removal water - Google Patents
The method and its processing unit of hardness in multistep combined removal water Download PDFInfo
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- CN109354238A CN109354238A CN201811190351.8A CN201811190351A CN109354238A CN 109354238 A CN109354238 A CN 109354238A CN 201811190351 A CN201811190351 A CN 201811190351A CN 109354238 A CN109354238 A CN 109354238A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 title claims abstract description 10
- 239000012528 membrane Substances 0.000 claims abstract description 56
- 238000003756 stirring Methods 0.000 claims abstract description 46
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 32
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000013078 crystal Substances 0.000 claims abstract description 20
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 18
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 18
- 238000005469 granulation Methods 0.000 claims abstract description 16
- 230000003179 granulation Effects 0.000 claims abstract description 16
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 14
- 230000001376 precipitating effect Effects 0.000 claims abstract description 12
- 238000005345 coagulation Methods 0.000 claims abstract description 8
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 230000015271 coagulation Effects 0.000 claims abstract description 7
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 4
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 239000000701 coagulant Substances 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 150000002505 iron Chemical class 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000001471 micro-filtration Methods 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 abstract description 9
- 229910001425 magnesium ion Inorganic materials 0.000 abstract description 9
- 239000002245 particle Substances 0.000 abstract description 9
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011575 calcium Substances 0.000 abstract description 5
- 239000010802 sludge Substances 0.000 abstract description 5
- 230000008021 deposition Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000012510 hollow fiber Substances 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 230000000192 social effect Effects 0.000 abstract description 3
- 239000007795 chemical reaction product Substances 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000009388 chemical precipitation Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- HDFXRQJQZBPDLF-UHFFFAOYSA-L disodium hydrogen carbonate Chemical compound [Na+].[Na+].OC([O-])=O.OC([O-])=O HDFXRQJQZBPDLF-UHFFFAOYSA-L 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 208000018556 stomach disease Diseases 0.000 description 1
- 208000014001 urinary system disease Diseases 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- C02F1/444—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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to the methods and its processing unit of hardness in a kind of multistep combined removal water, by granulation, precipitating and coagulation/UF membrane: adding calcium carbonate crystal seed and sodium carbonate precipitating reagent to stirring pool is granulated, it is sufficiently reacted with raw water, make newly-generated calcium carbonate constantly in the calcium carbonate seed surface deposition added, the closely knit crystal grain rapid precipitation of big partial size is formed to stirring pool bottom is granulated, removes most calcium and magnesium ion；Unprecipitated small particle crystal grain enters UF membrane pond, and the hydrolyzed reaction product with molysite with supernatant, forms larger-size floc particle object, further removes calcium and magnesium ion after hollow fiber ultrafiltration membrane separates, and the hardness of water outlet is greatly lowered.The crystal grain partial size that the present invention is formed is big, settling property is good, effectively overcomes the disadvantages of lime-soda precipitating tenderizer quiet heavy time is long, sludge output is big；Iron chloride coagulation is added in membrane cisterna, decelerating membrane pollution improves hardness removal rate, and environment and social effect are significant.
Description
Technical field
The present invention relates to a kind of water treatment technologies, are exactly to remove calcium ion and magnesium ion from water, provide one kind
The method and its processing unit of hardness in multistep combined removal water.
Background technique
Hardness is an important water quality indicator, is usually characterized with calcium ion, the magnesium ion equal size in water.Real life
In, drinking hard water will cause functions of intestines and stomach disorder, or even lure angiocarpy, nerve, urinary system disease etc. into.In industrial production,
Excessive high hardness may reduce the quality of product, or form scale blocking pipeline etc., it influences normally to produce or set off an explosion.Cause
This, go water removal in calcium ion and magnesium ion it is significant.
Hardness ions in water generally use the removal of the methods of chemical precipitation, ion exchange, UF membrane and electrochemistry.Ion
Exchange process is influenced by resin exchange capacity, has strict demand to the salt content of water inlet, and resin price is higher and generation needs
The regeneration liquid waste being further processed；Electrochemical process power consumption is larger, the drinking water treatment suitable for high salinity；Nanofiltration/reverse osmosis
Although can efficiently go the hardness in water removal thoroughly, high energy consumption limits the application of technology, chemical precipitation-micro-filtration/
There are fouling membranes for hyperfiltration technique seriously, is difficult to realize the defects of engineering.
Lime-soda precipitates tenderizer simple process, rate of deposition height, suitable for the sofening treatment of different requirements, but its
Sludge output is big, the quiet heavy time is long, leads to that structures volume is larger, sludge treatment is costly.The new chemical precipitation method are such as based on urinating
The microorganism catalysis CaCO of element hydrolysis3The precipitation method utilize CO2It is dissolved in water and generates CO3 2-, make itself and Mg2+、Ca2+Precipitating etc. is formed,
Although the hardness in water removal can preferably be gone, using more difficulty in engineering, its development is limited.
Summary of the invention
In view of the problems of the existing technology, the invention proposes granulation precipitating-coagulation/films point of suitable engineering application
From joint technology, the good large-size particles object of settleability is formed, effectively overcomes the lime-soda precipitating tenderizer quiet heavy time
Disadvantage long, sludge output is big, and coagulation can make the accelerated sedimentation of small size particle, and decelerating membrane pollution, hardness removal rate
Height, operating cost are low, and environment and social effect are significant.
Technical scheme is as follows: the method for hardness in multistep combined removal waste water includes the following steps:
1) it is granulated: disposably adding calcium carbonate crystal seed to being granulated in stirring pool, before being granulated stirring pool emptying, no longer add
Crystal seed；Precipitating reagent sodium carbonate is added simultaneously, and stirring is allowed to sufficiently react 15-20min with raw water；
2) it precipitates: after being granulated reaction, precipitating 10-15min, subsequent supernatant enters UF membrane pond；
3) coagulation/UF membrane: adding iron salt coagulant to UF membrane pond and carry out coagulation, continues under aeration stirring effect anti-
Particulate matter should be generated, after hollow-fibre membrane filters, is discharged after adding hydrochloric acid to neutralize.
The concentration of calcium ion is 32-40mg/L, hardness 130-140mg/L in raw water in step 1) of the present invention.
Calcium carbonate crystal seed dosage is 400-1000mg/L in step 1) of the present invention, and the dosage of sodium carbonate is
1000mg/L。
Stirring intensity is 420-550s in step 1) of the present invention-1。
Iron salt coagulant is ferric trichloride in step 3) of the present invention, and dosage is (with Fe3+Meter) it is 3.5mg/L.
The UF membrane pond residence time is 30 ± 5min in step 2) of the present invention.
Second technical solution of the invention is the processing unit of the method for hardness in multistep combined removal waste water, including original
Water feed pipe, the raw water feed pipe are connected to the water inlet for being granulated stirring pool top through intake pump, are granulated the supernatant of stirring pool
Water inlet of the liquid pipe road through intermediate lift pump junctional membrane separate tank top, hollow-fibre membrane inside UF membrane pond through outlet pipe with
Water outlet pump connection；Precipitating reagent adds pump and connects the feeding opening for being granulated stirring pool top by chemical feed pipe；Coagulant dosage pump passes through
The feeding opening on chemical feed pipe junctional membrane separate tank top；It is granulated stirring pool and blender is housed；Air blower junctional membrane separates bottom of pond portion
Air hose；Hydrochloric acid adds pump and passes through chemical feed pipe and pipe-line mixer junctional membrane separate tank outlet pipe；It is being granulated stirring pool and film point
Liquidometer is respectively mounted from pond.
Granulation stirring pool of the present invention and UF membrane pond are both made of cylinder and circular cone two parts.
Granulation stirring pool cone angle of the present invention is the product of 116 °, wherein cylinder and tapered segment than being 12:1.
UF membrane pond of the present invention cone angle is the product of 112 °, wherein cylinder and tapered segment than being 16:1.
Hollow-fibre membrane of the present invention is microfiltration membranes or ultrafiltration membrane.
The beneficial effects of the present invention are:
1, the present invention can in significant water lift hardness (calcium and magnesium ion) removal effect, reduce sludge quantity, delivery turbidity is steady
It is fixed.
Reactor based on this method, which can according to need, is designed to fixed or wheeled apparatus, and design scale can also be with
It flexibly chooses, the scope of application is not limited only to water process, can expand as needed to Industrial Wastewater Treatment, environment and social effect are aobvious
It writes.2, the present invention adds calcium carbonate crystal seed and sodium carbonate precipitating reagent to stirring pool is granulated, and sufficiently reacts, makes newly-generated with raw water
Calcium carbonate constantly in the calcium carbonate seed surface deposition added, forms the closely knit crystal grain rapid precipitation of big partial size and stirs to granulation
Bottom of pond portion is mixed, most calcium and magnesium ion is removed；Unprecipitated small particle crystal grain enters UF membrane pond with supernatant, and
With the hydrolyzed reaction product of molysite, form the floc particle object of size, further gone after hollow fiber ultrafiltration membrane separates deliming,
The hardness of water outlet is greatly lowered in magnesium ion.
Detailed description of the invention
Fig. 1 is experimental rig flow chart of the invention.
In figure: 1- intake pump；2- sodium carbonate adds pump；3- sodium carbonate fluid reservoir；4- is granulated stirring pool；5- blender；6-
Intermediate lift pump；7- iron chloride adds pump；8- iron chloride fluid reservoir；9- UF membrane pond；10- hollow-fibre membrane；11- air blower；
12- water outlet pump；13- hydrochloric acid adds pump；14- hydrochloric acid fluid reservoir；15- pipeline static mixer；16- liquidometer.
Specific embodiment
Below in conjunction with attached drawing, embodiments of the present invention will be described.It should be noted that the present embodiment is narrative
, without being restrictive, do not limited the scope of protection of the present invention with this embodiment.
The device of present example is shown in attached drawing 1.Granulation stirring pool is stainless steel, and bottom is centrum, 116 ° of cone angle, height
300mm；Top is cylindrical bodyUF membrane pond is stainless steel, and bottom is centrum, 116 ° of cone angle, height
400mm；Top is cylindrical bodyEquipped with 4 hollow fiber film assemblies, material is Kynoar, public
Aperture is referred to as 0.22 μm, and total filter area is 50m2.Device is used using programmable controller (PLC) control, fully automatic operation
General technology programming.The daily continuous operation of device for 24 hours, flow 0.63-0.84m3/ h, membrane separator is using lasting aeration interval
Water-out manners are discharged 8 minutes in every 10 minutes circulations, sky aeration 2 minutes.
Specific operation process is as follows are as follows: when device starts, disposably adds the carbonic acid prepared in advance to being granulated in stirring pool 4
Calcium crystal seed.Under PLC control, intake pump 1 extracts raw water and enters granulation stirring pool 4, while sodium carbonate adds pump 2 and stores up sodium carbonate
Sodium carbonate in medicinal cupping 3, which is added, is granulated stirring pool 4, and blender 5 continuously stirs, and is sufficiently mixed water, crystal seed and sodium carbonate simultaneously anti-
It answers；It staticly settles after a certain period of time, large-size particles object is deposited to the bottom for being granulated stirring pool 4, unprecipitated small size particle
Object enters UF membrane pond 9 by intermediate lift pump 6 with supernatant；Iron chloride adds pump 7 for the iron chloride in iron chloride medicine storing pot 8
UF membrane pond 9 is added, reacts to form bulky grain with the little particle in supernatant, is taken out through the separation of hollow-fibre membrane 10, water outlet pump 12
It is discharged after suction, while hydrochloric acid adds pump 13 for the hydrochloric acid in hydrochloric acid medicine storing pot 14 by pipeline static mixer 15 and UF membrane
The pH value that pond 9 is discharged, is allowed to meet the requirement of " standards for drinking water quality " (GB5749-2006).Air blower 11 divides to film
From 9 continuous aeration of pond, to slow down the pollution of hollow-fibre membrane.Liquidometer 16 is for controlling intake pump 1, intermediate lift pump 6 and going out
The start and stop of water pump 12.
Embodiment one
The flow of device is 0.63m3/ h, granulation stirring pool stirring intensity G value are 556s-1, the UF membrane pond residence time is
35min, raw water calcium ion concentration are 36mg/L, and total hardness is (with CaCO3Meter) it is 140mg/L.It is stirred when experiment starting to granulation
Pond adds the calcium carbonate crystal seed that 1000mg/L is prepared in advance, and sodium carbonate dosage is 1000mg/L, iron chloride dosage in experiment
(with Fe3+Meter) it is 3.5mg/L, 20min, quiet heavy 15min are stirred, water outlet calcium ion concentration average value is 0.91mg/L, removal rate
It is 97.5%；Total hardness average value is 22.03mg/L, removal rate 84.3%.
Embodiment two
The flow of device is 0.84m3/ h, granulation stirring pool stirring intensity G value are 556s-1, the UF membrane pond residence time is
30min, raw water calcium ion concentration are 32mg/L, and hardness is (with CaCO3Meter) it is 130mg/L.To granulation stirring pool when experiment starting
Add the calcium carbonate crystal seed that 500mg/L is prepared in advance, in experiment sodium carbonate dosage be 1000mg/L, iron chloride dosage (with
Fe3+Meter) it is 3.5mg/L, 15min, quiet heavy 10min are stirred, water outlet calcium ion concentration average value is 1.14mg/L, and removal rate is
96.5%；Total hardness average value is 23.07mg/L, removal rate 82.3%.After experiment, crystal grain average value by
32.42 μm increase to 142.00 μm.
Embodiment three
The flow of device is 0.63m3/ h, granulation stirring pool stirring intensity G value are 416s-1, the UF membrane pond residence time is
35min, raw water calcium ion concentration are 40mg/L, and hardness is (with CaCO3Meter) it is 140mg/L.To granulation stirring pool when experiment starting
Add the calcium carbonate crystal seed that 400mg/L is prepared in advance, in experiment sodium carbonate dosage be 1000mg/L, iron chloride dosage (with
Fe3+Meter) it is 3.5mg/L, 20min, quiet heavy 15min are stirred, water outlet calcium ion concentration average value is 1.16mg/L, and removal rate is
97.1%；Total hardness average value is 21.20mg/L, removal rate 84.9%.
Example IV
The flow of device is 0.84m3/ h, granulation stirring pool stirring intensity G value are 416s-1, the UF membrane pond residence time is
30min, raw water calcium ion concentration are 34mg/L, and hardness is (with CaCO3Meter) it is 130mg/L.To granulation stirring pool when experiment starting
Add the calcium carbonate crystal seed that 400mg/L is prepared in advance, in experiment sodium carbonate dosage be 1000mg/L, iron chloride dosage (with
Fe3+Meter) it is 3.5mg/L, 15min, quiet heavy 10min are stirred, water outlet calcium ion concentration average value is 1.07mg/L, and removal rate is
96.9%；Total hardness average value is 22.15mg/L, removal rate 83.0%.After experiment, crystal grain is increased by 32.66 μm
Greatly to 128.19 μm.
Claims (11)
1. the method for hardness in multistep combined removal waste water, which comprises the steps of:
1) it is granulated: disposably adding calcium carbonate crystal seed to being granulated in stirring pool, before being granulated stirring pool emptying, no longer add crystalline substance
Kind；Precipitating reagent sodium carbonate is added simultaneously, and stirring is allowed to sufficiently react 15-20min with raw water；
2) it precipitates: after being granulated reaction, precipitating 10-15min, subsequent supernatant enters UF membrane pond；
3) coagulation/UF membrane: adding iron salt coagulant to UF membrane pond and carry out coagulation, and it is raw that the reaction was continued under aeration stirring effect
At particulate matter, after hollow-fibre membrane filters, it is discharged after adding hydrochloric acid to neutralize.
2. the method for hardness in multistep combined removal waste water according to claim 1, which is characterized in that in the step 1)
The concentration of calcium ion is 32-40mg/L, hardness 130-140mg/L in raw water.
3. the method for hardness in multistep combined removal waste water according to claim 1, which is characterized in that in the step 1)
Calcium carbonate crystal seed dosage is 400-1000mg/L, and the dosage of sodium carbonate is 1000mg/L.
4. the method for hardness in multistep combined removal waste water according to claim 1, which is characterized in that in the step 1)
Stirring intensity is 420-550s-1。
5. the method for hardness in multistep combined removal waste water according to claim 1, which is characterized in that in the step 3)
Iron salt coagulant is ferric trichloride, and dosage is (with Fe3+Meter) it is 3.5mg/L.
6. the method for hardness in multistep combined removal waste water according to claim 1, which is characterized in that in the step 2)
The UF membrane pond residence time is 30 ± 5min.
7. using the processing unit of the method for hardness in multistep combined removal waste water described in claim 1, including raw water charging
Pipe, which is characterized in that the raw water feed pipe is connected to the water inlet for being granulated stirring pool top through intake pump, is granulated stirring pool
Water inlet of the supernatant pipeline through intermediate lift pump junctional membrane separate tank top, the hollow-fibre membrane inside UF membrane pond is through being discharged
Pipe is connect with water outlet pump；Precipitating reagent adds pump and connects the feeding opening for being granulated stirring pool top by chemical feed pipe；Coagulant dosage pump
Pass through the feeding opening on chemical feed pipe junctional membrane separate tank top；It is granulated stirring pool and blender is housed；Air blower junctional membrane separate tank bottom
The air hose in portion；Hydrochloric acid adds pump and passes through chemical feed pipe and pipe-line mixer junctional membrane separate tank outlet pipe；Be granulated stirring pool and
UF membrane pond is respectively mounted liquidometer.
8. the processing unit of the method for hardness in multistep combined removal waste water according to claim 7, which is characterized in that institute
It states granulation stirring pool and UF membrane pond is both made of cylinder and circular cone two parts.
9. the processing unit of the method for hardness in multistep combined removal waste water according to claim 8, which is characterized in that institute
Stating and being granulated the product ratio that stirring pool cone angle is 116 °, wherein cylinder and tapered segment is 12:1.
10. the processing unit of the method for hardness in multistep combined removal waste water according to claim 8, which is characterized in that
UF membrane pond cone angle is the product of 112 °, wherein cylinder and tapered segment than being 16:1.
11. the processing unit of the method for hardness in multistep combined removal waste water according to claim 7, which is characterized in that
The hollow-fibre membrane is microfiltration membranes or ultrafiltration membrane.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110589991A (en) * | 2019-09-10 | 2019-12-20 | 同济大学 | Method for removing calcium ions in high-concentration organic wastewater |
| CN110950477A (en) * | 2019-12-20 | 2020-04-03 | 葛洲坝中固科技股份有限公司 | Sludge dewatering high-alkalinity tail water treatment device and method |
| CN112456654A (en) * | 2020-11-10 | 2021-03-09 | 西安建筑科技大学 | Preparation method and application of biological seed crystal and method for synchronously removing calcium and fluorine in underground water |
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| CN113461130A (en) * | 2021-07-14 | 2021-10-01 | 浙江大学 | Papermaking wastewater treatment method utilizing seed crystal mediated enhanced calcium precipitation |
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