CN1198409A - No-pollution discharge regeneration method for softener - Google Patents
No-pollution discharge regeneration method for softener Download PDFInfo
- Publication number
- CN1198409A CN1198409A CN 97105847 CN97105847A CN1198409A CN 1198409 A CN1198409 A CN 1198409A CN 97105847 CN97105847 CN 97105847 CN 97105847 A CN97105847 A CN 97105847A CN 1198409 A CN1198409 A CN 1198409A
- Authority
- CN
- China
- Prior art keywords
- water
- hardness
- regeneration
- softener
- resin
- 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
- 238000011069 regeneration method Methods 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 127
- 230000008929 regeneration Effects 0.000 claims abstract description 66
- 239000011347 resin Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 40
- 239000002351 wastewater Substances 0.000 claims abstract description 9
- 239000012716 precipitator Substances 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 239000012492 regenerant Substances 0.000 claims description 11
- 238000004062 sedimentation Methods 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003456 ion exchange resin Substances 0.000 claims description 4
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 4
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical group [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims 1
- 238000011946 reduction process Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 2
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 abstract 1
- 239000008247 solid mixture Substances 0.000 abstract 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 11
- 238000011084 recovery Methods 0.000 description 10
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 9
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 239000001110 calcium chloride Substances 0.000 description 6
- 229910001628 calcium chloride Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 229910001424 calcium ion Inorganic materials 0.000 description 5
- 229910001425 magnesium ion Inorganic materials 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000003657 drainage water Substances 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000009938 salting Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000072 sodium resin Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
Images
Landscapes
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention relates to a recycling technology of waste water discharged by regeneration of an ion softener. The technical scheme solves the problem of waste water discharge in the regeneration and reduction process after the softener is out of work under the condition of not changing the operation mode and the resin regeneration mode of the original softener, namely directly recycling low-hardness water in the regeneration process and recycling high-hardness water after being treated by adding a precipitator, realizes the pollution-free regeneration and reduction of the softener, saves water, eliminates the influence of the discharged waste water on the environment, and simultaneously can obtain a corresponding calcium-magnesium salt solid mixture.
Description
The invention relates to a method for recovering and treating softener regeneration drainage in an ion exchange softened water treatment process.
As is well known, the ion exchange water softening treatment process is one of the common methods for water softening treatment, and the commonly used ion exchange resins are hydrogen type resin, sodium type resin and ammonium type resin. The process comprises two processes, wherein one process is a water preparation process, namely raw water passes through an ion exchanger, calcium ions and magnesium ions in the raw water are adsorbed on ion exchange resin, and the raw water is softened. And in the second step, in the regeneration and reduction process, after the softener is operated for a period of time, the ion exchange resin adsorbs a large amount of calcium and magnesium ions to reach saturation, and loses the softening capacity to water, and the regeneration and reduction process adopts a regenerant to clean the resin, remove the calcium and magnesium ions adsorbed on the resin and recover the original state of the resin. The hardness of the discharged water is different in different processes at different time in the whole regeneration reduction process, the hardness of partial discharged water is lower than or equal to the hardness of raw water, and the hardness of partial discharged water is higher than the hardness of raw water; the existing regeneration reduction process is to discharge all regeneration reduction drainage systems, so that a large amount of water is consumed, and the waste water discharge pollutes the environment.
The invention aims to analyze and determine the hardness of the discharged water in different regeneration and reduction processes so as to directly recover low-hardness water and treat and recover high-hardness water, solve the problems of water consumption and wastewater discharge in the regeneration and reduction processes, realize the regeneration and reduction without wastewater discharge of a softener, save water and eliminate environmental pollution.
In order to realize the purpose of the invention, the following technical scheme is adopted: the equipment comprises a softener with softened resin, a sedimentation tank, a filter tank, a liquid storage tank and a clean water tank; the low-hardness water discharged in the regeneration process of the softener is discharged into the clean water tank for replacement and recycling of the cleaning water or used as raw water, the high-hardness water is discharged into the sedimentation tank, a precipitator is added into the sedimentation tank, then the high-hardness water is filtered by the filter tank, and the filtrate is fed into the liquid storage tank to be used as regeneration liquid for next regeneration.
The low-hardness water refers to the hardness of the regenerated drainage water which is less than or equal to the hardness of the raw water, and the high-hardness water refers to the hardness of the regenerated drainage water of the softener which is greater than the hardness of the raw water; the precipitator removes the hardness of water and simultaneously generates softened resin ions; the softening resin in the softener is weak acid resin, sodium resin and ammonium resin. When the softening resin is sodium type resin, the precipitant is sodium carbonate, sodium phosphate, and sodium hydroxide; when the softened resin is hydrogen type resin, the precipitator is calcium hydroxide and concentrated sulfuric acid in sequence; when the softening resin is ammonium resin, the precipitant is ammonium carbonate.
The principle of the scheme is adopted: the regeneration process of the current ion exchange softener comprises the following steps: cocurrent regeneration ion exchanger, countercurrent regeneration ion exchanger, floating bed ion exchanger. The three regeneration processes are as follows:
① concurrent flow regeneration ion exchanger, backwash → regeneration → replacement → forward washing
② counter-current regeneration ion exchanger, small backwashing → draining water → pressing pressure → regeneration → replacement → forward washing
③ floating bed ion exchanger, descending bed → regeneration → replacement → front washing → getting up bed washing
From the above regeneration process it appears that: the three processes have three common steps: i.e., regeneration → displacement → forward wash. The hardness of the discharged water in all other steps is lower than that of theinlet water of the softener in operation and is equal to the hardness of the inlet water of the softener at the maximum according to analysis results, so that the discharged water in all the steps except the three common steps can be directly discharged into a clean water tank to be recycled as raw water or replacement and cleaning water.
Hardness analysis was performed on the three-step drainage water shared in common, and the hardness change was as shown in fig. 1: in the figure: t0 is the regeneration chemical injection start time, t1 is the time when the drain hardness increases to the raw water hardness, t2 is the time when the drain hardness decreases to the raw water hardness, t3 is the time when the softener regeneration forward wash is passed, y1 is the softener operation hardness control index, and y2 is the raw water hardness. From the graph of fig. 1, it can be seen that: the hardness of the drained water at the beginning of regeneration is stable, the change is small, the difference with the hardness of the raw water is small, the hardness of the drained water is obviously increased after the water is subjected to replacement for a period of time, and the hardness is reduced until the cleaning is finished. Obviously, the hardness of the discharged water in the two periods from t0 to t1 and t2 to the end of the cleaning is also lower than or close to the hardness of the raw water, and the water with low hardness can be directly recycled or discharged into a clean water tank to be recycled as the raw water or the cleaning water.
And (4) treating the drained water, namely the high-hardness water in the time period from t1 to t 2. The basic principle of the treatment is to add a precipitator to reduce the hardness and simultaneously generate a regenerant for the regeneration process.
① the method for treating the high-hardness water discharged from sodium ion exchanger in time period from t1 to t2 is that the high-hardness water containing calcium chloride and magnesium chloride is discharged into a sedimentation tank, and sodium carbonate is added into the tank, and the reaction is as follows:
② treatment of the effluent from the hydrogen-type ion exchanger, which is described herein by way of example only as a hydrogen chloride regeneration process, high hardness effluent containing calcium chloride and magnesium chloride during the time t 1-t 2 is treated and reduced to a hydrogen chloride regenerant, and for calcium hardness, sulfuric acid (concentrated) is used to soften the effluent to form a calcium sulfate precipitate which is less soluble and insoluble in hydrogen chloride (calcium chloride solubility is 74.5g at 20 ℃, calcium sulfate is 2036PPM, and calcium sulfate is insoluble in calcium chloride), while the hydrogen chloride produced is used as a regenerant for the hydrogen ion softener.
The reaction formula is as follows:
The technical scheme of the invention is based on the concept that the discharged water in the regeneration process is divided into low-hardness water and high-hardness water, and different treatment methods are adopted for the water with different hardness, so that no waste water is discharged in the regeneration process of the softener, the environmental pollution is eliminated, the water is saved, and meanwhile, the magnesium hydroxide, the calcium sulfate, the calcium carbonate and the magnesium carbonate products can be obtained from the precipitate.
FIG. 1 is a softener regeneration drainage hardness curve
FIG. 2 is a regeneration process of sodium type softener without pollution discharge
FIG. 3 is a regeneration scheme for hydrogen type softener without blowdown wherein: 1-softener 2-filter 3-clean water tank 4-liquid storage tank 5-sedimentation tank 6-powdery sodium carbonate feeder 7-calcium hydroxide feeder 8-sedimentation tank A9-concentrated sulfuric acid metering tank
The key point for implementing the technical scheme is how to determine the two moments t1 and t 2. This will be explained in detail in the examples. In addition, this solution is not used only in the described embodiments. It is also used in connection with softening and regenerating processes.
The invention is further illustrated by the following examples. It is known that: raw water analysis indexes:
total alkalinity of 3.9mg-N/L
Total hardness 5.6mg N/L
Temporary hardness 3.9mg-N/L
Permanent hard 1.7mg-N/L
Calcium ion 4.4mg-N/L
Magnesium ion 1.2 mg-N/L. Example 1
The diameter of the sodium ion exchanger is 2000mm, and the filling resin is 732 sodium type 5.6m3The height of the resin is 1.8m, the work exchange capacity is 1.5mg-N/g, the wet density of the resin is 1.28g/ml, the wet apparent density is 0.8g/ml, the regenerated liquid distribution device is 200mm away from the resin surface, the working capacity of the softener is 60t/hr, the cycle is 20hr, the cycle water yield is 1200t, and the hardness of the running effluent is 0.04 mg-N/L. The original working process and water consumption of the exchanger are as follows: program time (min) control flow (t/hr) Water-consuming (t) backwash 204013.3 salt (8%) 601010 replacement 30105 forward wash 405536.6 total 15064.9
Determining the drainage recovery process according to the original process, determining t1 and t2 (t 1 and t2 are determined by taking t0 as 0):
① recovering backwash water, the hardness of backwash water is the same as that of raw water during operation, the part of water is filtered by a filter and recovered to a clean water tank, the backwash time is 20min, and the water is discharged for 13.3 t.
② recovery of effluent water during regeneration and salting
One step is the recovery of low hardness water, the water is actually the water stored in the softener system during backwashing, and is discharged after the regeneration is started, the water is about 3.3 tons (the water storage capacity of the system is 3.3 tons according to the calculated system volume), and the water needs to be discharged after about 20min (the water flow is 10t/hr during the regeneration), namely the water discharged after 20min after the regeneration is started is high hardness water. T1 is thus known to be 40 min. And the second step is to discharge the high-hardness water into a sedimentation tank for treatment and recovery, namely discharging the discharged water 40min after the regeneration salting process into the sedimentation tank.
③ replacement process, the replacement process is used for removing the residual regenerant and the remanufactured materials, namely, the water stored in the softener system during the regeneration process is replaced, the water amount is still 3.3 tons, the replacement time is 20min because the replacement water flow is still 10t/hr, the water is recovered in a sedimentation tank as high-hardness water, the replacement is finished and the high-hardness water recovery is finished, and the cleaning process is shifted to cleaning, the water discharged during the cleaning process is low-hardness water, so the t2 is 100 min.
④ the cleaning water is recovered, and the water is directly recovered to clean water tank and used together with other low-hardness water for cyclic cleaning of the softener.
Through the above analysis, the regeneration and recovery process of this example is described as follows: program time controlled flow low hardness water and high hardness water
min (t/hr) drainage time (min) drainage amount (t) total 53.210 by salt 6010203.3406.7 substitution 2010203.3 of the normal washing 40554036.6 of the backwash 20402013.3 revealed that 53.2 tons of low hardness water and 10 tons of high hardness water were recovered. I.e. 63.2 tons of water can be recovered per cycle (20 hr).
Calculation of the amount of drug to be added (sodium carbonate is used as an example in this example)
The total hardness of the resin adsorption is as follows: (5.6-0.04) × 1200 ═ 6672(gN)
Approximately full hardness recovery in the regenerated, discharged high hardness water, then 6672gN hardness (in the form of calcium chloride and magnesium chloride) is present in the high hardness water and the sodium chloride in the spent regenerant is: 6672 gNx58.5 ═ 390.3kg
In addition, the original sodium chloride of the regeneration liquid is as follows: 10 ton × 8% ═ 800kg
About 390.3kg is consumed in the regeneration process, after 353.6kg of sodium carbonate is added, 390.3kg of sodium chloride is reduced, the content of sodium chloride in the regeneration liquid reaches 8 percent, the treated high-hardness water is pumped to a filter tank by a pump, filtered, and then the regeneration liquid is stored in a liquid storage tank for the regeneration of a softener next time.
The process flow is shown in figure 2
Examples 2,
The weak acid resin CNP-80 for the softener resin has the working exchange capacity of 2.0g-N/L, apparent wet density of 800g/L, wet true density of 1.18 and resin volume of 8.7m3The height is about 1.2m, the distance between the acid distribution pipe and the resin surface is 250mm, the hardness of the water outlet control index is 2mg-N/L, and the average value of actual analysis is 1.8mg-N/L, wherein magnesium ions are 0.8mg-N/L, calcium ions are 1.0mg-N/L, the periodic water yield is 4580t, and the regeneration process is as follows:
programmed time (min) control flow (t/h) water consumption (t)
Backwash 1512030
Adding acid (4-6%) 424229.4
Permutation 304221
Front washing 1518045
Process analysis as in example 1, the softener system holds about 8.3 tons of water, thus calculated as t 1: the 12 min end was determined by the same substitution time of 15min +8.3/42 × 60 ═ 27min, and the recovery of high hardness water was completed. Then t2 is 69 min. Example 2 the regeneration recovery process is described below. Program time (min) control flow (t/h) low-hardness water and high-hardness water
Discharge time (min) discharge amount (t) backwash 15201530 acid (4-6%) 4242128.33021 was added to replace 1242128.3 normal wash 151801545 for total 83.329.3, which resulted in 83.3+29.3 water savings per cycle, 112.6 t. 5. Separation of the dosage of the feed:
①, CaO dosage
The total amount of magnesium hard adsorbed by the resin is as follows: (1.2-0.8) × 4580 ═ 1832(gN)
The total amount of calcium and hard adsorbed by the resin is as follows: (4.4-1.0) × 4580 ═ 15572(gN)
The amount of CaO to be added is as follows: 1832X 36 ═ 65.95Kg (calculated as pure CaO)
Simultaneous conversion to 1832gN CaCl2
②, dosage of sulfuric acid
CaCl in high hard water after hard magnesium is converted into hard calcium2The total content of (A) is as follows:
15572+1832＝17404gN
the amount of sulfuric acid added is: 17402 × 49 ═ 852.8(Kg)
The amount of hydrochloric acid generated was: 17402 × 36.5 ═ 635.2(Kg)
③, the HCl content in the regeneration liquid is 30000 × 4% ═ 1200(Kg)
The regeneration consumption is:
consumption of magnesium adsorbed by the replacement resin + consumption of calcium adsorbedby the replacement resin
＝1832×36.5+15572×36.5≈635.2Kg
The regeneration process consumes HC1635.2Kg, 635.2Kg of HCl is reduced after adding sulfuric acid, the total content of HCl in the regeneration liquid can reach 1200Kg, and the filtered precipitate can be used for the next converter regeneration. The regeneration recovery process flow is shown in figure 3.
One of the characteristics of the technology is that the sewage is not discharged, and the regenerated water discharged into the environment by the prior art is completely recycled; the second characteristic is water saving, all the reclaimed water is recycled; and can obtain some by-products, such as magnesium hydroxide, calcium carbonate, calcium phosphate, calcium sulfate, etc.
Claims (7)
1. A softener regeneration method without pollution discharge comprises a softener with ion exchange resin, a sedimentation tank, a filter tank, a liquid storage tank and a clean water tank; the low-hardness water discharged in the regeneration process of the softener is discharged into the clean water tank to be used as raw water or used as replacement and cleaning water for recycling, the high-hardness water is discharged into the sedimentation tank, added with a precipitator and then filtered in the filter tank, and the filtrate is discharged into the liquid storage tank to be used as regeneration liquid.
2. The method as claimed in claim 1, wherein the low hardness water is a regeneration effluent having a hardness less than or equal to a hardness of the raw water, and the high hardness water is a regeneration effluent having a hardness greater than the hardness of the raw water.
3. The process for regeneration of a softener without waste water according to claim 1, wherein the precipitant removes hardness from the water while generating a regenerant for use in the regeneration.
4. The method of regenerating a softener without discharging waste water according to claim 1, wherein the softening resin in the softener is any one of weak acid type resin, sodium type resin and ammonium type resin.
5. The regeneration method of softener without discharging pollution as in claim 1, wherein when the softening resin is a sodium type resin, the precipitant is any one of sodium carbonate, sodium phosphate and sodium hydroxide.
6. The regeneration method of softener without discharging pollution as in claim 1, wherein when the softening resin is hydrogen type resin, the precipitator is calcium hydroxide and concentrated sulfuric acid in sequence.
7. The method of regenerating a softener without discharging waste according to claim 1, wherein the precipitant is ammonium carbonate when the softening resin is ammonium type resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97105847 CN1198409A (en) | 1997-05-07 | 1997-05-07 | No-pollution discharge regeneration method for softener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97105847 CN1198409A (en) | 1997-05-07 | 1997-05-07 | No-pollution discharge regeneration method for softener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1198409A true CN1198409A (en) | 1998-11-11 |
Family
ID=5168142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97105847 Pending CN1198409A (en) | 1997-05-07 | 1997-05-07 | No-pollution discharge regeneration method for softener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1198409A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390348C (en) * | 2003-12-31 | 2008-05-28 | 钱光万 | Detergent free wash mill capable of recycling use of water |
| CN106542609A (en) * | 2016-10-25 | 2017-03-29 | 芜湖东旭光电科技有限公司 | Soften resin regeneration method, system and the method using the system regeneration resin |
| CN106745512A (en) * | 2016-12-12 | 2017-05-31 | 张宏伟 | Uphole steam generator regenerating softener waste water zero discharge device and its renovation process |
| CN107840412A (en) * | 2017-12-11 | 2018-03-27 | 淄博格瑞水处理工程有限公司 | A kind of zero-emission softened water equipment |
-
1997
- 1997-05-07 CN CN 97105847 patent/CN1198409A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390348C (en) * | 2003-12-31 | 2008-05-28 | 钱光万 | Detergent free wash mill capable of recycling use of water |
| CN106542609A (en) * | 2016-10-25 | 2017-03-29 | 芜湖东旭光电科技有限公司 | Soften resin regeneration method, system and the method using the system regeneration resin |
| CN106745512A (en) * | 2016-12-12 | 2017-05-31 | 张宏伟 | Uphole steam generator regenerating softener waste water zero discharge device and its renovation process |
| CN107840412A (en) * | 2017-12-11 | 2018-03-27 | 淄博格瑞水处理工程有限公司 | A kind of zero-emission softened water equipment |
| CN107840412B (en) * | 2017-12-11 | 2018-09-11 | 淄博格瑞水处理工程有限公司 | A kind of zero-emission softened water equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1289413C (en) | Technique for processing reclamation of industrial wastewater from printing electronic circuit board | |
| CN104261526B (en) | The processing method of heavy metal wastewater thereby | |
| JP4880656B2 (en) | Water treatment apparatus and water treatment method | |
| JPH0952087A (en) | Water treatment method and apparatus therefor | |
| CN103073123A (en) | Metal plating wastewater recycle using and recycling technology process | |
| CN104129831A (en) | Method for simultaneous removal and recovery of heavy metal ions and organic acid by using chelating resin | |
| CN113666561B (en) | High-salt sulfur-containing fluorine-containing wastewater treatment process | |
| CN1724167A (en) | Process for reactivating gel type strong base negative resin of polluted in industrial water treatment | |
| CN101157506B (en) | Integral method for silicon-removing, water purification and softening of oil field sewage | |
| CN1522974A (en) | By-pass flow process for treating industrial cyclic cooling water | |
| JP4210403B2 (en) | Regeneration method of mixed-bed type sugar liquid purification equipment | |
| CN1234619C (en) | Method for treating wastewater generated from fabricating nitrophenol as well as for reclaiming and using resources | |
| CN1198409A (en) | No-pollution discharge regeneration method for softener | |
| JP4543481B2 (en) | Method for treating water containing boron and fluorine | |
| JPH0592187A (en) | Treatment of fluorine-containing water | |
| CN209161509U (en) | A kind of salt refining system of electrolysis production chlorine and hydrogen | |
| CN212076637U (en) | Water softening equipment regeneration waste water classification recovery system | |
| CN1276879C (en) | Method for recovering mother solid water in aromatic carboxylic acid production | |
| CN1611451A (en) | Method for biochemical treatment of discharged water | |
| JP3160435B2 (en) | Pure water production apparatus and method for regenerating the same | |
| CN204779136U (en) | Electroplating wastewater treatment recycle system | |
| JP3252521B2 (en) | Rinse wastewater treatment method | |
| CN217103410U (en) | Device for removing ammonia nitrogen from manganese ore leachate | |
| CN202849186U (en) | H<+>-containing wastewater multi-stage recycle device | |
| CN211283951U (en) | Wastewater zero-discharge pretreatment system suitable for total alkalinity greater than calcium hardness |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |