CN102285736B - Reverse osmosis pre-treatment method for recycling reclaimed water in electric power plant - Google Patents
Reverse osmosis pre-treatment method for recycling reclaimed water in electric power plant Download PDFInfo
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 48
- 238000002203 pretreatment Methods 0.000 title abstract description 5
- 238000004064 recycling Methods 0.000 title abstract 2
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- 238000001914 filtration Methods 0.000 claims abstract description 22
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 150000001768 cations Chemical class 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 238000000108 ultra-filtration Methods 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 238000005352 clarification Methods 0.000 claims description 10
- 238000005345 coagulation Methods 0.000 claims description 10
- 230000015271 coagulation Effects 0.000 claims description 10
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 10
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
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- 235000017550 sodium carbonate Nutrition 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
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- 239000000126 substance Substances 0.000 abstract description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 125000002091 cationic group Chemical group 0.000 abstract 1
- 230000001112 coagulating effect Effects 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
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- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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Abstract
The invention discloses a reverse osmosis pre-treatment method for recycling reclaimed water in an electric power plant. The reverse osmosis pre-treatment method comprises the following steps: 1) coagulating and clarifying the reclaimed water; 2) filtering in a filtering tank with variable pore aperture; 3) filtering with a multi-medium filter; 4) softening with a strong-cationic sodium ion exchanger; 5) softening with a double-chamber weak-acid and strong-acid cationic exchanger; and 6) adjusting the pH value. The reverse osmosis pre-treatment method has the advantages that: the reclaimed water is pre-treated before reverse osmosis, thereby greatly reducing the reverse osmosis scale formation and contamination blockage risks caused by hardness, COD (chemical oxygen demand), SiO2 and the like in the reclaimed water, prolonging the service life of a reverse osmosis membrane element, and improving the reverse osmosis operation stability of the electric power plant.
Description
Technical field
The present invention relates to a kind of pretreatment process of middle water before reverse osmosis that can recycle that is applied in the power plant, particularly the reverse osmosis pretreatment process of water when being back to power plant in a kind of.
Background technology
Middle water reuse is the effective way that solves the Water of Power Plant shortage of resources, also is the essential condition of the new enlarging of power plant.Municipal middle water water-quality constituents complexity, the saltiness in the water, COD, SiO
2, every index such as ammonia nitrogen, turbidity and colourity all has at double increase than natural water, and contain production and a large amount of tensio-active agent of the discharging of living, when it is back to reverse-osmosis treated, very easily cause reverse osmosis dirty stifled, cause reverse osmosis declines of exerting oneself, cycle of operation shortening, frequent matting, the power station water supply deficiency can make the reverse-osmosis membrane element lost of life when serious, has influenced the stable of power plant's reverse osmosis operation greatly.
At present, in the power plant of water reuse, mostly adopt ultrafiltration as the reverse osmosis pretreatment technology in the employing, ultrafiltration is taken up an area of bigger, the investment cost height, and at this complicated water body of middle water, although ultrafiltration is down to claimed range with feed water by reverse osmosis SDI value, but ultrafiltration is relatively poor to the removal effect of the organism in the water and microorganism, ultrafiltration and the reverse osmosis dirty stifled situation in succession that often occurs in service, reverse osmosis water production rate occurs and descends, and pressure reduction rises, degradation situation under the ratio of desalinization, operation stability is affected.
Summary of the invention
Technical problem to be solved by this invention provide a kind of in the reverse osmosis pretreatment process of water when being back to power plant, water is to the dirty stifled risk of reverse osmosis in can effectively reducing, prolong the reverse osmosis cycle of operation, reduce the matting frequency, improve the reverse osmosis operation stability; Effectively improve the Waste water utilization rate, make that the reverse osmosis rate of recovery is the highest can to reach 95%, saved great lot of water resources.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the reverse osmosis pretreatment process when water is back to power plant in a kind of, and it may further comprise the steps:
1) water coagulation clarification in; In water input mechanical stirring accelerating purifying pool in pending, adding unslaked lime, bodied ferric sulfate, polyacrylamide in the settling pond carries out coagulation clarification and handles, wherein unslaked lime adds dose and reaches 0.1-0.3mmol/L for making the water outlet hydroxide radical, it is 10-40mg/L that bodied ferric sulfate adds dose, and it is 0.3-2.0mg/L that polyacrylamide adds dose; Water hardness and basicity in the mensuration if hardness value specific alkalinity value is big, and when surpassing 3mmol/L, adds yellow soda ash in the system and make the difference of hardness value and basicity value less than 1mmol/L;
2) become the hole filter; To filter in the input of the water after coagulation clarification the is handled change hole filter tank;
3) more medium filter filters; To filter in the water input more medium filter after becoming the hole filter, wherein more medium filter adopts hard coal and quartz sand as filler, the SDI value of the water after filtering through more medium filter is ultimate value 6.7, the water of 20%-50% after then will filtering through more medium filter is sent in the ultrafiltration, the ultrafiltration water outlet mixes back input clean water basin with the water outlet of residue more medium filter, when water outlet SDI value less than ultimate value 6.7, the water after then will filtering through more medium filter directly be imported clean water basin;
4) strong positive type Na-ion exchanger is softening; Water in the clean water basin is delivered to strong positive type Na-ion exchanger, make Na-ion exchanger go out the water hardness and be lower than 1.5mmol/L;
5) two chamber weak acid, strongly-acid cation exchanger are softening; Water after strong positive type Na-ion exchanger is handled is introduced two chambers weak acid, strongly-acid cation exchanger, weak acid resin and strong resin volume ratio in the described pair of chamber weak acid, the strongly-acid cation exchanger are 4:1-5:1, and two chambers weak acid, strongly-acid cation exchanger go out the water hardness and be lower than 10 μ mol/L;
6) the pH value is adjusted; To through adding NaOH or KOH in the water after two chambers weak acid, the strongly-acid cation exchanger processing, make reverse osmosis concentrated water pH value be 9.0-9.5.
The beneficial effect that adopts technique scheme to produce is: the middle water that is back in power plant's heat supply network and the circulating water system is necessary through reverse-osmosis treated before drawing-in system, and does not pass through saltiness, COD, the SiO of pretreated middle water in early stage
2, every index such as ammonia nitrogen, turbidity and colourity all has at double increase than natural water, in reverse osmosis process, be very easy to cause dirty stifled, cause reverse osmosis power to descend, pressure reduction rises, the normal life cycle of reverse-osmosis membrane element shortens, and carries out matting continually, the power station water supply deficiency, can make the reverse-osmosis membrane element lost of life when serious, influence the stable of power plant's reverse osmosis operation greatly; The present invention is by carrying out pre-treatment with middle water before reverse osmosis, hardness, COD, SiO in reducing greatly in the water
2Deng causing reverse osmosis fouling and dirty stifled risk, prolong reverse-osmosis membrane element work-ing life, improve the stability of power plant's reverse osmosis operation.
Description of drawings
Fig. 1 is schema of the present invention.
Further the present invention is described in detail below in conjunction with accompanying drawing.
Embodiment
Reverse osmosis pretreatment process when a kind of middle water as shown in Figure 1 is back to power plant is characterized in that, may further comprise the steps:
1) water coagulation clarification in; In water input mechanical stirring accelerating purifying pool in pending, adding unslaked lime, bodied ferric sulfate, polyacrylamide in the settling pond carries out coagulation clarification and handles, wherein unslaked lime adds dose and reaches 0.1-0.3mmol/L for making the water outlet hydroxide radical, it is 10-40mg/L that bodied ferric sulfate adds dose, and it is 0.3-2.0mg/L that polyacrylamide adds dose; Water hardness and basicity in the mensuration if hardness value specific alkalinity value is big, and when surpassing 3mmol/L, adds yellow soda ash in the system and make the difference of hardness value and basicity value less than 1mmol/L;
2) become the hole filter; To filter in the input of the water after settling pond the is handled change hole filter tank;
3) more medium filter filters; To filter in the water input more medium filter after becoming the hole filter, wherein more medium filter adopts hard coal and quartz sand as filler, if the SDI value through the water after the more medium filter filtration is ultimate value 6.7, the water of 20%-50% after then will filtering through more medium filter is sent in the ultrafiltration, the ultrafiltration water outlet mixes back input clean water basin with the more medium filter water outlet, if the water after water outlet SDI value less than ultimate value 6.7, then will be filtered through more medium filter is directly imported clean water basin;
4) strong positive type Na-ion exchanger is softening; Water in the clean water basin is delivered to strong positive type Na-ion exchanger, make Na-ion exchanger go out the water hardness and be lower than 1.5mmol/L;
5) two chamber weak acid, strongly-acid cation exchanger are softening; Water after strong positive type Na-ion exchanger is handled is introduced two chambers weak acid, strongly-acid cation exchanger, weak acid resin and strong resin volume ratio in the described pair of chamber weak acid, the strongly-acid cation exchanger are 4:1-5:1, and two chambers weak acid, strongly-acid cation exchanger go out the water hardness and be lower than 10 μ mol/L;
6) the pH value is adjusted; To through adding NaOH or KOH in the water after two chambers weak acid, the strongly-acid cation exchanger processing, make reverse osmosis concentrated water pH value be 9.0-9.5.
In concrete application process, at first pending middle water is carried out coagulation clarification, be introduced in the mechanical stirring accelerating purifying pool, accelerator is to utilize machinery water to be promoted and stirring, impel the body refuse circulation, and solid impurity and established body refuse contact flocculation and the pond of precipitation separation in the water in making, the effect of this step is that the solid impurity in the centering water removes, and can prevent effectively that solid impurity from influencing the normal operation of subsequent processing device; When removing solid impurity, also in accelerator, add unslaked lime, bodied ferric sulfate, polyacrylamide and sodium sulfate centering water mix softening, unslaked lime, bodied ferric sulfate, the basicity of water and the relation between the hardness are determined in the add-on basis of polyacrylamide and sodium sulfate, central water hardness value specific alkalinity value is big, and when surpassing 3mmol/L, unslaked lime adds dose and reaches 0.1-0.3mmol/L for making the water outlet hydroxide radical, it is 10-40mg/L that bodied ferric sulfate adds dose, it is 0.3-2.0mg/L that polyacrylamide adds dose, and the add-on of yellow soda ash is to make the difference of middle water hardness value and basicity value be lower than 1mmol/L; If the difference between middle water hardness value and the basicity value during less than 1mmol/L, only needs to add unslaked lime, bodied ferric sulfate and polyacrylamide, add-on is the add-on during greater than basicity value 3mmol/L with hardness value; Central water is through coagulation clarification, and correlation parameter reaches after the requirement, be introduced into to become in the hole filter tank and filter, become the hole filter tank and adopt a kind of filter bed that mixes by a certain percentage than the bigger filtrate of normally used particle diameter of filter medium and another kind of particulate filtrate, become the particle diameter of filter medium and the shared ratio that adopt in the hole filter tank and differ bigger, what mainly used in change hole filter tank is coarse media, it relies on whole filtering layer to filter, avoided general filter chamber to form the surface filtration of filtering layer like this, reduced the filtering layer resistance, also avoid penetrating too early of suspended particle, can also improve filtering velocity; The adding of fine filtering material and in filtering layer mixing greatly reduced the local porosity of coarse media, improved the throwing out of fine particle in the sewage, more be conducive to the removal to fine particle, also greatly improved the retaining power in filter tank, the solid impurity in its role is to further remove in the water; The middle water that comes out from become the hole filter tank is directly introduced more medium filter and is filtered, more medium filter adopts hard coal and quartz sand as filler, quartz sand can effectively be removed the suspended substance in the water, and pollutents such as the colloid in the water, iron, organism, agricultural chemicals, manganese, bacterium, virus are had tangible removal effect.It has filtration resistance little, specific surface area is big, resistance to acids and bases is strong, and resistance to oxidation, the pH scope of application are 2-13, advantages such as resistance to crocking is good, the distinct advantages of quartz sand is also to have realized the self-adapting operation of strainer by optimizing the design of filtrate and strainer that filtrate has very strong adaptivity to influent density, operational condition, pretreatment technology etc., namely filter bed forms automatically and dredges close state down when filtering, and is conducive to guarantee under various operational conditionss effluent quality; Hard coal has solid particulate hold facility preferably, the effect that can improve suspended particle removing ability more medium filter reliably is to remove impurity in the sewage, absorption wet goods, the requirement that water quality is met recycle, the effect of filtering, mainly be suspension or the colloidal state impurity of removing in the water, particularly can remove fine particle that precipitation technology can not remove and bacterium etc. effectively, BOD5 and COD etc. also has certain removal effect.
In the standard that has been tending towards gradually through the middle water after the more medium filter filtration can be recycled, but the middle water hardness still can cause reverse osmosis generation fouling, so be introduced into the strong positive Na-ion exchanger reduce in water hardness, the middle water hardness of handling through the strong positive Na-ion exchanger is lower than 1.5mmol/L; The middle water that hardness is lower than 1.5mmol/L is introduced two chambers weak acid, strongly-acid cation exchanger, two chambers weak acid, strongly-acid cation exchanger is that anion-cation exchange resin is seated in the same ion-exchanger by a certain percentage, utilize the bigger exchange capacity of weak acid positive resin remove in the water inlet whole temporarily not firmly, the remaining strong acid sun resin that relies on is firmly forever on a small quantity removed, this design can effectively increase the cycle of operation of second stage softening agent, and in regenerative process, utilize strong acid sun regeneration of resin spent solution regeneration weak acid positive resin can improve the regenerated liquid utilization ratio, two chambers weak acid among the present invention, weak acid resin in the strongly-acid cation exchanger and strong resin volume ratio are 4:1-5:1, the middle water hardness of handling through cation exchanger is lower than 10 μ mol/L, can satisfy the hardness requirement of feed water by reverse osmosis fully, under the situation that does not add Scale inhibitors, reverse osmosis the calcium magne-scale can not occur yet, in order to reduce COD and SiO
2Influence to reverse osmosis, in the middle water of handling through cation exchanger, add NaOH or KOH, making reverse osmosis concentrated water pH value be 9.0-9.5, is that the middle water of 9.0-9.5 directly carries out reverse-osmosis treated at last with the pH value, and the water after the reverse-osmosis treated is as the moisturizing of power plant's water of productive use.
Claims (1)
1. the reverse osmosis pretreatment process when water is back to power plant in a kind is characterized in that, may further comprise the steps:
1) water coagulation clarification in; In water input mechanical stirring accelerating purifying pool in pending, adding unslaked lime, bodied ferric sulfate, polyacrylamide in the mechanical stirring accelerating purifying pool carries out coagulation clarification and handles, wherein unslaked lime adds dose and reaches 0.1-0.3mmol/L for making the water outlet hydroxide radical, it is 10-40mg/L that bodied ferric sulfate adds dose, and it is 0.3-2.0mg/L that polyacrylamide adds dose; Water hardness and basicity in the mensuration if hardness value specific alkalinity value is big, and when surpassing 3mmol/L, adds yellow soda ash in the system and make the difference of hardness value and basicity value less than 1mmol/L;
2) become the hole filter; To filter in the middle water input change hole filter tank after coagulation clarification is handled;
3) more medium filter filters; To filter in the water input more medium filter after becoming the hole filter, wherein more medium filter adopts hard coal and quartz sand as filler, the SDI value of the water after filtering through more medium filter is ultimate value 6.7, the water of 20%-50% after then will filtering through more medium filter is sent in the ultrafiltration, and the ultrafiltration water outlet mixes back input clean water basin with remaining more medium filter water outlet; When water outlet SDI value less than ultimate value 6.7, the water after then will filtering through more medium filter directly be imported clean water basin;
4) strong positive type Na-ion exchanger is softening; Water pump in the clean water basin is delivered to strong positive type Na-ion exchanger, make Na-ion exchanger go out the water hardness and be lower than 1.5mmol/L;
5) two chamber weak acid, strongly-acid cation exchanger are softening; Water after strong positive type Na-ion exchanger is handled is introduced two chambers weak acid, strongly-acid cation exchanger, weak acid resin and strong resin volume ratio in the described pair of chamber weak acid, the strongly-acid cation exchanger are 4:1-5:1, and two chambers weak acid, strongly-acid cation exchanger go out the water hardness and be lower than 10 μ mol/L;
6) the pH value is adjusted; To through adding NaOH or KOH in the water after two chambers weak acid, the strongly-acid cation exchanger processing, make reverse osmosis concentrated water pH value be 9.0-9.5.
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| CN115159731A (en) * | 2022-07-13 | 2022-10-11 | 徐州水处理研究所 | Protective application method of reverse osmosis membrane by adopting alkali hardness-reducing adsorption bed |
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| US20050016906A1 (en) * | 2003-06-27 | 2005-01-27 | Doug Gettman | Mobile field electrical supply, water purification system, wash system, water collection, reclamation, and telecommunication apparatus |
| US7815804B2 (en) * | 2006-12-12 | 2010-10-19 | Otv Sa S.A. | Method for treating wastewater or produced water |
| US7520993B1 (en) * | 2007-12-06 | 2009-04-21 | Water & Power Technologies, Inc. | Water treatment process for oilfield produced water |
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