CN105016501A - Method for treating high boron content terrestrial heat tail water - Google Patents
Method for treating high boron content terrestrial heat tail water Download PDFInfo
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Abstract
The invention provides a method for treating high boron content terrestrial heat tail water. The terrestrial heat tail water first passes through a boron removal prefilter and a boron removal filter and then undergoes ceramic membrane ultra-filtration treatment and multistage reverse osmosis treatment. The prefilter is filled with a filtering medium formed by sintering activated carbon and diatomaceous earth, and the boron removal filter is filled with boron removal absorbent resin containing multivalent alcoholic groups and amino groups. The boron removal filter isolates a filter material by using a fiber filter screen, and the terrestrial heat tail water enters the prefilter and the filter low and comes out high. When the boron content of the terrestrial heat tail water is 100 mg/L, the boron removal rate is not lower than 99.6%, and the water quality of discharged water can respectively reach the waste water discharge standard and drinking water or farm irrigation water quality standard. The method for treating the high boron content terrestrial heat tail water is good in boron removal effect, reduces device investment cost and running cost and improves utilization level of terrestrial heat tail water resources.
Description
Technical field
The present invention relates to Industrial Wastewater Treatment and recycling field, particularly relate to a kind for the treatment of process of high boric geothermal tail water.
Background technology
China's geothermal energy resources rich reserves, existing based on north exploitation, the cold time is used for town dweller's heating, has both saved a large amount of fire coal, and has additionally reduced carbonic acid gas, sulfur dioxide emissions.
For preventing immoderate exploitation geothermal energy resources, geothermal exploitation requires " well one is filled with ", is intended to protect deep layer water source.But inverted well drilling expense is high, time limit of service is of short duration, so it is fast-developing to constrain geothermal exploitation cause.For region, Xianyang, beat a bite inverted well cost and heal 5,000,000 yuan (well depth 3300m × 1550 yuan/m=511.5 ten thousand yuan), when tail water recharged stratum after 3 ~ 6 months, immediate vicinity of wellbore just produces pollution and silts up, loses the effect of recharging.Rough estimates, during heat supply in winter, Amount of geothermal water more 1,000,000 tons is drawn in whole nation accumulation every day, and tail water recharges quantity not sufficient 20%, and namely most tail water is directly outer arranges or is processed through sewage treatment plants.
Implement geothermal tail water Treatment and recovery to utilize, geothermal tail water after treatment, drinking water standard can be met, or surface water emission standard, so both can alleviate fresh water and lack situation, the not enough problem in shallow underground water source can have been made up again, and once shallow-layer water system saturated after, to the infiltration of stratum depth, deep layer water source can be recovered.In a word, no matter be that the strategic development taken over from the energy is considered, be still conceived to current demand, implement geothermal tail water Treatment and recovery and utilize, do not rely on merely inverted well and dispose tail water, an Important Action of all can yet be regarded as.
" geothermal tail water " refers to the ground pyrogen water after sheet frame heat exchange, generally come from 1000 ~ 3500m depths under earth's surface, water quality components is very complicated, not only salinity is high, heavy metal ion (lead, chromium, zinc, mercury etc.) and nonmetallic ion (boron, arsenic, fluorine etc.) content also higher.For region, Xianyang, geothermal tail water Boron contents is about 100mg/L, exceeds country's " water environment quality standard " set quota (≤0.5mg/L) 200 times.Relevant toxicity test test-results shows: after absorption of human body is more than 100mg boron, can produce intoxicating phenomenon, first injure internal organ, even cause life danger.If in farm crop, cash crop and vegetables pouring water during boron-containing quantity >=30mg/L, the underproduction or total crop failure can be caused.
Removing boron process aspect, " except boron special RO film " that Japan produces achieves certain effect, but there are some problems when processing geothermal tail water: one is complex process, first tail water (former water) pH value is needed to heighten to more than 10.5 from 7.1, Plus acidic material neutralization again after water is produced until terminal, thus, general expenses must be caused to increase; Two is except boron rate≤90%, still exceeds 20 times of CNS; Three is producing water ratio≤60%, and remaining 40% still can cause secondary pollution; Four is " except boron dedicated film " heatproof≤40 DEG C, and geothermal tail water is 50 ~ 55 DEG C, directly can not enter film.And adopt Filtration Adsorption technical finesse geothermal tail water, when geothermal tail water boron-containing quantity 100mg/L, adopt more than 10 kinds of producing except boron resin or medium both at home and abroad, carry out laboratory experiment and Side-stream respectively, though through level Four Filtration Adsorption, except boron rate is still less than 90%, water outlet is far away higher than the requirement of national surface water emission standard.Therefore existing boron technique of removing cannot meet the technical requirements of geothermal tail water except boron.
In boron equipment, when the built-in medium of equipment carries out adsorption filtration, all adopt " water cap " (a kind of small-sized umbrella strainer) insulation blocking medium both at home and abroad, implement filtering function simultaneously.Water cap mostly is PE material, screw thread (sub-buckle) is poor with card (steel plate) box anastomose property, equipment runs more than 0.5MPa, screw thread is very easily caused to come off or the fracture of water cap grid, cause the medium in equipment all to run off at short notice, the operating requirement of adsorption filtration except boron can not be met.
Summary of the invention
For the technical requirements of geothermal tail water except boron, in order to overcome in prior art except low, the processed waste water of boron rate can not the fully rate of recovery and qualified discharge, except boron equipment is fragile, etc. problem, the invention provides a kind for the treatment of process of geothermal tail water, improve except boron efficiency, reduce equipment investment cost and working cost, improve geothermal tail water recycling level.
The treatment process of a kind of high boric geothermal tail water of the present invention is achieved in that
A. geothermal tail water enter by prefilter and except boron filter form except boron device, removal solid, ionic impurity and boron; Water outlet after process reaches wastewater discharge standard, and high boric concentrated solution can as carrying boron raw material;
B. process except boron filter water outlet enters ceramic membrane ultrafitration equipment;
C. the impermeable process of one-level is carried out in ceramic membrane ultrafitration water outlet, and first-stage reverse osmosis water outlet can reach drinking water sanitary standard;
D. two, three grades of reverse-osmosis treated are carried out in first-stage reverse osmosis water outlet, and three grades of reverse osmosis water outlets can reach drummed pure water hygienic standard;
The filtration medium that the filling of described prefilter is sintered by gac and diatomite, described except boron filter filling is containing multivalence alcohol radical and amino except boron polymeric adsorbent;
Described except boron filter be vertical pot container, be made up of tank upper end, tank body, tank lower end three part; The top of described tank upper end is provided with air inlet and exhaust valve; The bottom of described tank lower end is provided with wash water valve; The side, bottom of described tank body is provided with geothermal tail water import, and the top of the described tank body opposite side relative with described geothermal tail water import is provided with and produces the mouth of a river; On described geothermal tail water import, be provided with lower face plate, have upper face plate at the described product mouth of a river, below described upper face plate and described lower face plate, be equipped with fabric screen.
In the specific implementation, the boron content of described geothermal tail water is: 20mg/L-200mg/L, and its salinity is 4000mg/L ~ 6000mg/L, total hardness is 200mg/L ~ 260mg/L, soluble solid is 4000mg/L ~ 5000mg/L, soluble silica is 40mg/L ~ 50mg/L, water glass is 30mg/L ~ 60mg/L, fluorine is 2mg/L ~ 2.5mg/L.In the specific implementation, in described prefilter, the particle diameter of filtration medium is 0.2 ~ 0.4mm; The described particle diameter removed except boron polymeric adsorbent in boron filter is 0.2 ~ 0.4mm.The mesh aperture of described upper fabric screen and lower fabric screen is 100 ~ 120 orders; Described upper face plate and described lower face plate are fixed to described tank body with support.
In the specific implementation, in step a, the working pressure 0.1 ~ 0.2MPa of described prefilter, inflow temperature≤60 DEG C, tank circulation time in vivo 5 ~ 40min, preferably 5 ~ 15min, cleaning interval 4 ~ 8h, preferably 5 ~ 7, scavenging period 2 ~ 3h; Described working pressure 0.1 ~ 0.2MPa except boron filter, inflow temperature≤60 DEG C, inlet flow-patterm 7 ~ 10, preferably 7 ~ 8, tank circulation time in vivo 10 ~ 40min, preferably 5 ~ 15min, cleaning interval 3 ~ 6h, preferably 4 ~ 5, scavenging period 2 ~ 3h.
In the specific implementation, when described prefilter cleaning, first use the scavenging solution containing 0.93 ~ 0.99wt% sodium hydroxide to carry out alkalescence cleaning, then use the scavenging solution containing 1.2 ~ 1.28wt% hydrochloric acid to carry out acidity cleaning; Described except boron filter cleaning time, first use and carry out acidity cleaning containing the scavenging solution of 1.2 ~ 1.28wt% hydrochloric acid, then use the scavenging solution containing 0.93 ~ 0.99wt% sodium hydroxide to carry out alkalescence and clean.
In the specific implementation, when described prefilter cleaning, the scavenging period of described alkalescence cleaning and acid cleaning is respectively 15min; After alkalescence cleaning, clean with clear water, the pH to cleaning water outlet is 7 ~ 8; After acidity cleaning, clean with clear water, the pH to cleaning water outlet is 5 ~ 6; Described except boron filter cleaning time, described acidity cleaning and alkalescence cleaning scavenging period be respectively 15min; After acidity cleaning, clean with clear water, the pH to cleaning water outlet is 5 ~ 6; After alkalescence cleaning, clean with clear water, the pH to cleaning water outlet is 7 ~ 8.
In the specific implementation, in step b, the operational condition of described ceramic membrane ultrafitration is: inflow temperature≤60 DEG C, working pressure≤0.4MPa, recoil cycle 0.3h ~ 0.75h, 0.5 ~ 1 minute time of recoil, kickback pressure≤0.5Mpa, produces water suspension particle diameter≤0.05 μm; In step c, the impermeable operational condition of described one-level is: water inlet quantity 20 ~ 25m
3/ h, product water number amount 12.5 ~ 14m
3/ h, inflow temperature≤60 DEG C, working pressure 1.3 ~ 1.4MPa, 3 ~ 6 months cleaning intervaies; In steps d, described two, three grades of impermeable operational conditions are: water inlet quantity 0.7 ~ 0.8m
3/ h, product water number amount 0.5 ~ 0.6m
3/ h, inflow temperature≤60 DEG C, working pressure 0.9 ~ 1.1MPa, 10 ~ 18 months cleaning intervaies.In step c and steps d, adopt first-stage reverse osmosis to produce the aqueous solution of 0.5 ~ 1wt% sodium lauryl sulphate of water preparation, temperature >=50 DEG C are as the scavenging solution of reverse osmosis membrane.
The Main Function of pre-processing device is that interception intercepts contained solid matter in tail water, not only significantly promotes except boron efficiency, and can save about 30% except boron expense.
Pre-treatment filtrate is the particle being mixed sintering by the material such as activated carbon particles and diatomite, uses, excellent with except boron polymeric adsorbent compatibility; This filtrate is reused after regeneration, can greatly reduce except boron working cost.Suspended substance≤10mg/L in pretreated geothermal tail water, boron 20mg/L ~ 200mg/L.
The polymeric adsorbent loaded except boron filter is a kind of polymkeric substance, there is the effect of significant selective adsorption boron, its chemical structure possesses multivalence alcohol radical and amido in functional group, multivalence alcohol portion and boron generate complex anion, the complex anion that amine moieties generates as the trapping of anionresin base, thus adsorption selection boron ion.This filtrate is not by the impact of the salt that coexists, but very responsive to pH value, and complexing ion only could generate in neutral or basic solution, otherwise, complexing ion decomposition in acidic solution.
Except the product water water quality of boron filter both can reach wastewater discharge standard, can link upstream device again, by water quality advanced process, making to purify water reaches tap water or farmland irrigation water index request.The extraction boron concentrated solution utilizing the present invention to obtain can be gone again and be prepared boronation product; For preparation boronation product, achieve " changing harmful to treasure ", stopped environment " secondary pollution " and create prerequisite.
Adopt 100 order plane synthon filter clothes, substitute the filter type of " water cap " spacer medium followed for many years, technique is brief, cheap; Its circulation area, compared with water cap, can improve more than 3 times; And high temperature resistant, corrosion-resistant, ultimate compression strength improves more than three times, and time limit of service can extend 3 years; Not only greatly reduce cost of investment, and can guarantee that filtration medium no longer suffers a loss.Compared with adopting the prior art of " water cap ", the method can improve unit time tail water treatment capacity two times, and stops filtration medium leakage at any time.
When the present invention changes geothermal tail water (or waste water) process by media filtration, the top-down traditional method generally adopted, adopt low in and high out technique, solve during actual production runs " bias current " that very easily occur, improve tail water Disposal quality and production timeliness.And breach geothermal tail water or Industrial Wastewater Treatment higher than 40 DEG C of technical limitation, by temperature increase to 60 DEG C, expanded geothermal tail water and carried out pyroprocessing and deep processing range of application.
In geothermal tail water process and comprehensive utilization process flow process, generally, pretreater and except boron filter, with water cleaning and filtering medium; But due to geothermal tail water silicon and calcium sulphate content higher, impurity (fine silt or suspended substance) can be adhered on filtration medium, so, acid and basic solution also will be used if desired to carry out matting.
When geothermal tail water boron-containing quantity 100mg/L, adopt home and abroad to produce more than 10 plant except boron resin or medium, have done laboratory experiment and Side-stream respectively, though through level Four Filtration Adsorption, except boron rate about≤90%.Of the present invention first through the filtration medium of pretreater, and then through polymeric adsorbent except boron, excellent, except boron rate >=99.6%, ton water cost of investment and ton water running cost compared with prior art decline 58% and 40% respectively, not only except effect of boron is good but also significantly can reduce energy consumption.The present invention is directed to the water quality characteristic of geothermal tail water, have developed to be novel process flow process that is auxiliary and that organically combine except boron equipment, membrane sepn, at improvement geothermal tail water, prevent in shallow-layer water source and environmental pollution, have received significant " pollution treatment extra earning " effect.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of geothermal tail water of the present invention except boron filter, wherein:
The import of 1-geothermal tail water; 2-produces the mouth of a river; 3-filter medium inlet; 4-filtration medium exports; 5-air inlet and exhaust valve; 6-sewage draining exit; 7-upper face plate; 8-lower face plate; The upper fabric screen of 9-; Fabric screen under 10-; 11-upper flange; 12-lower flange; 13 supports-; 14-support; 15-equipment supporter
Accompanying drawing 2 is process flow sheets of geothermal tail water boron removal method of the present invention.
Embodiment
Be described in further detail technical scheme of the present invention below in conjunction with embodiment and accompanying drawing, protection scope of the present invention is not limited to following embodiment.
Embodiment 1
Certain geothermal tail water is derived from well depth meter more than 3000 hot well, and its water quality components is complicated: salinity 4000 ~ 6000mg/L, tail water temperature 55 ~ 60 DEG C, boron-containing quantity 20 ~ 130mg/L, total hardness 200 ~ 260mg/L, soluble solid 4000 ~ 5000mg/L, soluble silica 40 ~ 50mg/L, water glass 30 ~ 60mg/L, fluorine 2 ~ 2.5mg/L.
Geothermal tail water is first through pretreater (1#, 2#, 3#), and the filtration medium of pretreater filling is the ZD-01 (ZD-01 is the inorganic filtrate generated by high temperature, high pressure, catalysis series reaction by the material such as diatomite, gac) that enlightening energy auxiliary agent company limited is levied in Xuzhou.Pretreater operational condition is: water inlet quantity 20 ~ 25m
3/ h, produces water number amount 20 ~ 25m
3/ h, produces quality and estimates as clear as crystal, operating pressure≤0.2MPa, inflow temperature≤60 DEG C, tank circulation time in vivo 15min, and comparatively inflow temperature is low about 1 DEG C to produce water temp, and the cleaning interval is about 6h, scavenging period 2 ~ 3h.
Through pretreated geothermal tail water enter structure as accompanying drawing 1 except boron treater (4#, 5#, 6#), except boron treater filling except boron polymeric adsorbent be the ZD-02 (ZD-02 is a kind of ultrapure water resin of uniqueness, has special removal effect and do not affect other species character to the boron in water) that enlightening energy auxiliary agent company limited is levied in Xuzhou.Except the mesh aperture of fabric screen on boron treater and lower fabric screen is 100 orders; Described upper face plate and described lower face plate are fixed to described tank body with support; Its operational condition is: water inlet quantity 20 ~ 25m
3/ h, produces water number amount 20 ~ 25m
3/ h, produces quality and estimates as clear as crystal, operating pressure≤0.2MPa, inflow temperature≤60 DEG C, and comparatively inflow temperature is low about 1 DEG C to produce water temp, and inlet flow-patterm 7 ~ 8, tank circulation time in vivo 20min, Boron contents≤0.5mg/L, the cleaning interval is about 4h, scavenging period 2 ~ 3h.
Pretreater (1#, 2#, 3#) and except boron filter (4#, 5#, 6#) interior filtrate cleaning and regeneration using method basically identical; Clean the chemical agent selected and liquid compound proportion identical; After preparation in medicament use order, the two is then on the contrary, and when namely 1#, 2#, 3# equipment cleans respectively, first medicament uses B liquid (alkali lye), and then with A liquid (acid solution); And 4#, 5#, 6# equipment is when cleaning respectively, first use A agent (acid solution), and then with B agent (alkali lye).
The collocation method of scavenging solution is as follows: A agent (A liquid) is the clear water of the hydrochloric acid+96% of 4%, and B agent (B liquid) is 3% liquid caustic soda+97% clear water; Wherein concentration of hydrochloric acid is: 30% ~ 32% (technical grade, liquid, inclusion-free), and liquid paper mill wastewater is: 31% ~ 33% (technical grade, liquid, inclusion-free).
The cleaning process of prefilter: first open into Teat pipette, input B liquid in prefilter, clean-out system circulation about 15 minutes; Then carry out clear water flushing, and detect the pH value of water outlet, until cleaning to pH value is 8; Then A liquid cleaning filtrate is inputted, clean-out system circulation about 15 minutes; Re-use clear water to rinse, and detect the pH value of water outlet, until cleaning to pH value is about 5.5.
Cleaning process except boron filter: first open into Teat pipette, toward input A agent in boron filter, clean-out system circulation about 15 minutes; Then carry out clear water flushing, and detect the pH value of water outlet, until cleaning to pH value is 5.5; Then B agent cleaning filtrate is inputted, clean-out system circulation about 15 minutes; Re-use clear water to rinse, and detect the pH value of water outlet, until cleaning to pH value is about 8.
Carry out ceramic membrane ultrafitration process except boron filter produces water, the operational condition of uf processing is: water inlet quantity 20 ~ 25m
3/ h, produces water number amount 20 ~ 25m
3/ h, produce quality: suspended substance particle diameter≤0.05 μm (instrument test inclusion-free), operating pressure≤0.4MPa, inflow temperature≤60 DEG C, comparatively inflow temperature is low about 1 DEG C to produce water temp, cleaning interval 24h ~ 48h, scavenging period 2 ~ 3h, recoil cycle 0.3h ~ 0.75h (adopting self-produced water or one-level RO to produce water cleaning), about 1 minute recoil time, kickback pressure≤0.5Mpa.
Ultra-filtration membrane produces water and carries out first-stage reverse osmosis process, and the operational condition of first-stage reverse osmosis process is: water inlet quantity 20 ~ 25m
3/ h, produces water number amount 12.5 ~ 14m
3/ h, produces quality: middle water or tap water standard, operating pressure 1.3 ~ 1.4MPa, inflow temperature≤60 DEG C, and comparatively inflow temperature is low about 1 DEG C to produce water temp, 3 ~ 6 months cleaning intervaies, scavenging period 2 ~ 3h.
Two, three grades of reverse-osmosis treated are carried out in first-stage reverse osmosis process, and the operational condition of two, three grades of reverse-osmosis treated is: water inlet quantity 0.7 ~ 0.8m
3/ h, produces water number amount 0.5 ~ 0.6m
3/ h, produces quality: meet national purified drinking water standard, operating pressure 0.9 ~ 1.1MPa, inflow temperature≤60 DEG C, and comparatively inflow temperature is low about 0.5 DEG C to produce water temp, 10 ~ 18 months cleaning intervaies, scavenging period 1 ~ 2h.
The scavenging solution of reverse osmosis membrane uses sodium lauryl sulphate, and produce water preparating liquid with one-level RO, concentration is 0.5 ~ 1%, and temperature is greater than 50 DEG C.
Adopt geothermal tail water treatment process of the present invention, a set of day process 300m
3geothermal tail water treatment unit, run by nearly one-year age and prove: the continuous stable and reliable operation of filter plant at different levels, product water except boron device meets national sewage discharge one-level A standard (except boron rate>=99.6%, meeting relative national standards), first-stage reverse osmosis product water can reach tap water standard, two, three grades of reverse osmosis equipments produce water and can reach national purified drinking water standard.Ton water invests 0.90 ten thousand yuan (terminal product pure water), ton water running cost 4.80 yuan.(produce quality and meet national purified drinking water standard).
Comparative example 1
Adopt " except the special RO film of boron " treatment process that certain company of Japan produces, this technology is except boron rate :≤90%.(not meeting relative national standards); Equipment heatproof :≤40 DEG C of (geothermal tail water temperature (50 ~ 55 DEG C) of embodiment 1; Ton water is invested 1.60 ten thousand yuan (terminal product pure water); Ton water running cost 11.40 yuan.
Compared with comparative example 1, the treatment process of the geothermal tail water that embodiment 1 provides, improves except boron efficiency, reduces equipment investment cost and working cost, significantly improve geothermal tail water recycling level.
Claims (9)
1. a treatment process for high boric geothermal tail water, the method comprises the following steps successively:
A. geothermal tail water enter by prefilter and except boron filter form except boron device, removal solid, ionic impurity and boron; Water outlet after process reaches wastewater discharge standard, and high boric concentrated solution can as carrying boron raw material;
B. process except boron filter water outlet enters ceramic membrane ultrafitration equipment;
C. the impermeable process of one-level is carried out in ceramic membrane ultrafitration water outlet, and first-stage reverse osmosis water outlet can reach drinking water sanitary standard;
D. two, three grades of reverse-osmosis treated are carried out in first-stage reverse osmosis water outlet, and three grades of reverse osmosis water outlets can reach drummed pure water hygienic standard;
The filtration medium that the filling of described prefilter is sintered by gac and diatomite, described except boron filter filling is containing multivalence alcohol radical and amino except boron polymeric adsorbent;
Described except boron filter be vertical pot container, be made up of tank upper end, tank body, tank lower end three part; The top of described tank upper end is provided with air inlet and exhaust valve; The bottom of described tank lower end is provided with wash water valve; The side, bottom of described tank body is provided with geothermal tail water import, and the top of the described tank body opposite side relative with described geothermal tail water import is provided with and produces the mouth of a river; On described geothermal tail water import, be provided with lower face plate, have upper face plate at the described product mouth of a river, below described upper face plate and described lower face plate, be equipped with fabric screen.
2. treatment process according to claim 1, is characterized in that:
In described prefilter, the particle diameter of filtration medium is 0.2 ~ 0.4mm; The described particle diameter removed except boron polymeric adsorbent in boron filter is 0.2 ~ 0.4mm.
3. treatment process according to claim 1, is characterized in that:
The mesh aperture of described upper fabric screen and lower fabric screen is 100 ~ 120 orders; Described upper face plate and described lower face plate are fixed to described tank body with support.
4. treatment process according to claim 1, is characterized in that:
The boron content of described geothermal tail water is: 20mg/L-200mg/L, and its salinity is 4000mg/L ~ 6000mg/L, total hardness is 200mg/L ~ 260mg/L, soluble solid is 4000mg/L ~ 5000mg/L, soluble silica is 40mg/L ~ 50mg/L, water glass is 30mg/L ~ 60mg/L, fluorine is 2mg/L ~ 2.5mg/L.
5. treatment process according to claim 1, is characterized in that:
In step a, the working pressure 0.1 ~ 0.2MPa of described prefilter, inflow temperature≤60 DEG C, tank circulation time in vivo 5 ~ 40min, cleaning interval 4 ~ 8h, scavenging period 2 ~ 3h; Described working pressure 0.1 ~ 0.2MPa except boron filter, inflow temperature≤60 DEG C, inlet flow-patterm 7 ~ 10, tank circulation time in vivo 10 ~ 40min, cleaning interval 3 ~ 6h, scavenging period 2 ~ 3h;
When described prefilter cleaning, first use the scavenging solution containing 0.93 ~ 0.99wt% sodium hydroxide to carry out alkalescence cleaning, then use the scavenging solution containing 1.2 ~ 1.28wt% hydrochloric acid to carry out acidity cleaning;
Described except boron filter cleaning time, first use and carry out acidity cleaning containing the scavenging solution of 1.2 ~ 1.28wt% hydrochloric acid, then use the scavenging solution containing 0.93 ~ 0.99wt% sodium hydroxide to carry out alkalescence and clean.
6. treatment process according to claim 5, is characterized in that:
In step a, the tank circulation time in vivo 5 ~ 15min of described prefilter, cleaning interval 5 ~ 7h; The described inlet flow-patterm 7 ~ 8 except boron filter, tank circulation time in vivo 5 ~ 15min, cleaning interval 4 ~ 5h;
When described prefilter cleaning, the scavenging period of described alkalescence cleaning and acid cleaning is respectively 15min; After alkalescence cleaning, clean with clear water, the pH to cleaning water outlet is 7 ~ 8; After acidity cleaning, clean with clear water, the pH to cleaning water outlet is 5 ~ 6;
Described except boron filter cleaning time, described acidity cleaning and alkalescence cleaning scavenging period be respectively 15min; After acidity cleaning, clean with clear water, the pH to cleaning water outlet is 5 ~ 6; After alkalescence cleaning, clean with clear water, the pH to cleaning water outlet is 7 ~ 8.
7. treatment process according to claim 1, is characterized in that:
In step b, the operational condition of described ceramic membrane ultrafitration is: inflow temperature≤60 DEG C, working pressure≤0.4MPa, recoil cycle 0.3h ~ 0.75h, 0.5 ~ 1 minute time of recoil, kickback pressure≤0.5Mpa, produces water suspension particle diameter≤0.05 μm.
8. treatment process according to claim 1, is characterized in that:
In step c, the impermeable operational condition of described one-level is: water inlet quantity 20 ~ 25m
3/ h, product water number amount 12.5 ~ 14m
3/ h, inflow temperature≤60 DEG C, working pressure 1.3 ~ 1.4MPa, 3 ~ 6 months cleaning intervaies;
In steps d, described two, three grades of impermeable operational conditions are: water inlet quantity 0.7 ~ 0.8m
3/ h, product water number amount 0.5 ~ 0.6m
3/ h, inflow temperature≤60 DEG C, working pressure 0.9 ~ 1.1MPa, 10 ~ 18 months cleaning intervaies.
9. treatment process according to claim 8, is characterized in that:
In step c and steps d, adopt first-stage reverse osmosis to produce the aqueous solution of 0.5 ~ 1wt% sodium lauryl sulphate of water preparation, temperature >=50 DEG C, as the scavenging solution of reverse osmosis membrane.
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| WO2017105348A1 (en) * | 2015-12-17 | 2017-06-22 | Singapore University Of Technology And Design | Boron removal and measurement in aqueous solutions |
| CN105836912B (en) * | 2016-06-08 | 2019-08-20 | 蔡雅婷 | A kind of GEOTHERMAL WATER purification process technique |
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| CN201024100Y (en) * | 2007-03-29 | 2008-02-20 | 陶韬 | Natural mineral sea water desalting purifying filter |
| JP2011110515A (en) * | 2009-11-27 | 2011-06-09 | Kurita Water Ind Ltd | Method and apparatus for purifying ion exchange resin |
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| WO2017105348A1 (en) * | 2015-12-17 | 2017-06-22 | Singapore University Of Technology And Design | Boron removal and measurement in aqueous solutions |
| US10981144B2 (en) | 2015-12-17 | 2021-04-20 | Singapore University Of Technology And Design | Method of removing borate ions from an aqueous solution |
| US11224855B2 (en) | 2015-12-17 | 2022-01-18 | Singapore University Of Technology And Design | Method of removing boric acid from an aqueous solution |
| CN105836912B (en) * | 2016-06-08 | 2019-08-20 | 蔡雅婷 | A kind of GEOTHERMAL WATER purification process technique |
| CN106277408A (en) * | 2016-09-24 | 2017-01-04 | 合肥信达膜科技有限公司 | A kind of rainwater film processing system |
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