CN114163021A - Method for treating heavy metal wastewater containing complex - Google Patents
Method for treating heavy metal wastewater containing complex Download PDFInfo
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- CN114163021A CN114163021A CN202111476488.1A CN202111476488A CN114163021A CN 114163021 A CN114163021 A CN 114163021A CN 202111476488 A CN202111476488 A CN 202111476488A CN 114163021 A CN114163021 A CN 114163021A
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- China
- Prior art keywords
- heavy metal
- metal wastewater
- complex
- hypochlorite
- hardness
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 59
- 239000002351 wastewater Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 31
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000126 substance Substances 0.000 claims abstract description 27
- 239000008394 flocculating agent Substances 0.000 claims abstract description 17
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 11
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- 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 7
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 7
- 239000002455 scale inhibitor Substances 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 claims 8
- 229910021645 metal ion Inorganic materials 0.000 abstract description 13
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 description 11
- 239000006228 supernatant Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005189 flocculation Methods 0.000 description 7
- 230000016615 flocculation Effects 0.000 description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 239000000460 chlorine Substances 0.000 description 6
- 229910052801 chlorine Inorganic materials 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 229910001425 magnesium ion Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 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 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 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
- 150000002739 metals Chemical class 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for treating heavy metal wastewater containing a complex, belonging to the technical field of water treatment. The method comprises the following steps: mixing a substance containing hypochlorite with heavy metal wastewater containing a complex to be treated to obtain a complex breaking system, adjusting the pH of the complex breaking system to 10-11.5, and mixing with a flocculating agent; the dosage ratio of the substance containing hypochlorite to the heavy metal wastewater is 10-30 ppm: 10 mL. In the method, the sodium hypochlorite has strong oxidizability, can be hydrolyzed to form hypochlorous acid, the hypochlorous acid is further decomposed to form nascent oxygen with strong oxidizability, the stability of a complex existing in the heavy metal wastewater containing the complex can be effectively damaged, metal ions exist again in a free state, and then the metal ions are mixed with the flocculating agent, can be quickly flocculated and settled under the action of the flocculating agent, effectively reduce the hardness and turbidity of the wastewater, and have high efficiency.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for treating heavy metal wastewater containing a complex.
Background
The total water hardness refers to Ca in water2+、Mg2+Including temporary hardness and permanent hardness. Ca in water2+、Mg2+The portion in the form of bicarbonate is removed by its formation of carbonate precipitates upon heating, referred to as temporary hardness; on the other hand, the part existing in the form of sulfate, nitrate, chloride, etc. is relatively stable in nature and cannot be removed by heating.
Currently, methods for reducing water hardness include membrane separation, electromagnetic, ion exchange, chemical addition, and lime methods.
The ion exchange method usually adopts a specific cation exchange resin, and replaces calcium and magnesium ions in water with sodium ions, and because the solubility of sodium salt is very high, the condition that scale is generated along with the rise of temperature is avoided.
The membrane separation method generally employs a nanofiltration membrane (NF) and a reverse osmosis membrane (RO) to intercept calcium and magnesium ions in water, thereby fundamentally reducing the hardness of water.
The lime method is generally to add lime into water, mainly used for treating high-flow high-hardness water, and only can reduce the hardness to a certain range.
Electromagnetic methods generally employ an electric or magnetic field applied to water to change the characteristics of ions, thereby changing the deposition rate and physical characteristics of calcium carbonate (magnesium carbonate) to prevent hard scale formation.
The chemical adding method is to add special antisludging agent into water to change the combination of Ca and Mg ions and carbonate ions and avoid the precipitation and deposition of scale.
In the case of the chemical addition method, it takes a long time to achieve a low hardness, and the hardness removal efficiency is low.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for treating heavy metal wastewater containing a complex, which can quickly reduce the hardness and turbidity of the wastewater and has high efficiency.
The application can be realized as follows:
the application provides a method for treating heavy metal wastewater containing a complex, which comprises the following steps: mixing a substance containing hypochlorite with heavy metal wastewater containing a complex to be treated to obtain a complex breaking system, adjusting the pH of the complex breaking system to 10-11.5, and mixing with a flocculating agent;
the dosage ratio of the substance containing hypochlorite to the heavy metal wastewater is 10-30 ppm: 10 mL.
In a preferred embodiment, the ratio of the hypochlorite-containing substance to the heavy metal wastewater is 20 ppm: 10 mL.
In an alternative embodiment, the heavy metal wastewater is reclaimed water treated by a phosphorus-containing scale inhibitor.
In an alternative embodiment, the hypochlorite-containing substance and the heavy metal wastewater are stirred and mixed for 15-25min at 25-30 ℃.
In an alternative embodiment, the hypochlorite-containing substance is sodium hypochlorite.
In an alternative embodiment, the adjusting agent used to adjust the pH is liquid alkali.
In an alternative embodiment, the concentration of liquid caustic ranges from 30 to 35 wt%.
In an optional embodiment, the complex breaking system and the regulator are stirred and mixed for 5-8min at the temperature of 25-30 ℃, and then are mixed with the flocculant.
In an alternative embodiment, the flocculating agent comprises a polymeric ferric sulphate and a polyacrylamide.
In an alternative embodiment, the dosage ratio of the polymeric ferric sulfate to the heavy metal wastewater is 0.04-0.06 mL: 10 mL.
In an alternative embodiment, the dosage ratio of polyacrylamide to heavy metal wastewater is 0.4-0.6 mg: 10 mL.
The beneficial effect of this application includes:
the application mixes the substance containing hypochlorite with the heavy metal wastewater containing the complex to be treated, wherein the sodium hypochlorite has strong oxidizability, the hypochlorous acid can be formed through hydrolysis, the hypochlorous acid is further decomposed to form nascent oxygen with strong oxidizability, and for the heavy metal wastewater containing the complex, the stability of the complex existing in the heavy metal wastewater can be effectively destroyed, so that metal ions exist in a free form again, and then the heavy metal wastewater is mixed with the flocculating agent, so that the heavy metal wastewater can be flocculated and settled quickly under the action of the flocculating agent, the hardness and turbidity of the wastewater can be effectively reduced, and the efficiency is high.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of the method for treating heavy metal wastewater containing complex provided by the present application.
The application aims at that the heavy metal wastewater is such heavy metal wastewater: the heavy metal wastewater pretreated to form the complex may be, for example, wastewater treated with a phosphorus-containing scale inhibitor in the early stage and then formed into a complex from the scale inhibitor and heavy metals (it is understood that the heavy metal wastewater is recycled water treated with the phosphorus-containing scale inhibitor), wherein the contained heavy metals include iron, calcium, magnesium, copper, and the like.
In the prior art, if the wastewater with the complex is required to reach the lower hardness degree, a large amount of flocculant is consumed, the flocculation settling time is long, and the hardness removal efficiency is low. Furthermore, the hardness degradation of the post-softening system is also influenced.
In view of the above, the inventors have creatively provided a method for treating heavy metal wastewater containing complex, which can rapidly reduce the hardness and turbidity of wastewater and has high efficiency.
Specifically, the method comprises the following steps: mixing a substance (as a complex breaker) containing hypochlorite with heavy metal wastewater containing a complex to be treated to obtain a complex breaking system, adjusting the pH of the complex breaking system to 10-11.5, and mixing with a flocculating agent.
The method is characterized in that a substance containing hypochlorite radicals is mixed with heavy metal wastewater containing a complex to be treated, wherein sodium hypochlorite has strong oxidizability, can be hydrolyzed to form hypochlorous acid, the hypochlorous acid is further decomposed to form nascent oxygen with strong oxidizability, the stability of the complex (such as EDTA, ammonia, citric acid and the like) existing in the heavy metal wastewater containing the complex can be effectively destroyed, metal ions exist in a free state again, and are more easily influenced by a flocculating agent than the complex state, and then the heavy metal wastewater containing the complex can be quickly flocculated and settled under the action of the flocculating agent after being mixed with the flocculating agent, so that the hardness and turbidity of the wastewater can be effectively reduced, and the efficiency is high. Moreover, the method can greatly reduce the usage amount of the flocculating agent compared with the method without the complex breaking treatment.
For reference, the ratio of the hypochlorite-containing substance to the heavy metal wastewater may be 10 to 30 ppm: 10mL, such as 10 ppm: 10mL, 15 ppm: 10mL, 20 ppm: 10mL, 25 ppm: 10mL or 30 ppm: 20mL, etc., and may be 10 to 30 ppm: any other value within the range of 10 mL. The concentrations are in terms of available chlorine.
It is worth noting that if the amount of the hypochlorite-containing substance is less than 10ppm, only a part of metal ions in the complex can exist in a free state again, and all the metal ions cannot be in the free state; if the hypochlorite-containing substance is used in an amount of more than 30ppm, there will be an excess amount after all the metal ions in the complex are present in a free state, and this portion of the hypochlorite-containing substance may affect or even damage the equipment involved in the subsequent water treatment process, which is to be protected from oxidation.
It is to be noted that the hypochlorite-containing substance used in the present application is preferably sodium hypochlorite, which is not only effective in breaking the complex but also low in cost and low in risk. In addition, the possibility of using other hypochlorites is not excluded.
Preferably, the substance containing hypochlorite and the heavy metal wastewater are stirred and mixed for 15-25min at the temperature of 25-30 ℃.
Through mixing under the stirring condition, the substance containing hypochlorite can be quickly and uniformly mixed with the heavy metal wastewater containing the complex, the complex breaking effect is quickly achieved, and the metal ions in the complex are quickly formed into a free state. According to the rotating speed and the time, all metal ions in the heavy metal wastewater containing the complex can be ensured to be in a free state, and the time required for breaking the complex can be prolonged due to too low rotating speed.
In this application, the pH of the adjusted decomplexation system may be 10, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11, 11.1, 11.2, 11.3, 11.4, or 11.5, etc., or may be any other value within the range of 10-11.5.
The pH value is adjusted to the range, so that the free metal formed after the decomplexation can be quickly flocculated and settled. Outside the above pH range, flocculation settling cannot be achieved for all free metals, or even occur at all.
By reference, the adjusting agent used herein to adjust the pH is liquid alkali. The concentration may be 30 to 35 wt%, such as 30 wt%, 30.5 wt%, 31 wt%, 31.5 wt%, 32 wt%, 32.5 wt%, 33 wt%, 33.5 wt%, 34 wt%, 34.5 wt%, or 35 wt%, etc., or may be any other value within the range of 30 to 35 wt%.
The alkali liquor with the concentration is more suitable for the wastewater treated by the phosphorus-containing scale inhibitor in the application.
Preferably, the complex breaking system and the regulator are stirred and mixed for 5-8min at the temperature of 25-30 ℃, and then are mixed with the flocculating agent. The pH value of each position of the complex breaking system can be within the range of 10-11.5 by stirring and mixing, and the free metal ions at each position can be effectively flocculated and settled.
By reference, the flocculants used herein include, preferably consist only of, Polymeric Ferric Sulfate (PFS) and Polyacrylamide (PAM).
Wherein, the polyferric sulfate is in a solution form, does not contain harmful substances such as aluminum, chlorine, heavy metal ions and the like, and does not have the water phase transfer of iron ions. During the coagulation treatment, when PFS provides nuclear hydroxyl complex with multiple components, each component starts to perform multiple coagulation effects on colloidal particles in water. The adsorption capacity to colloid particles is large in the sedimentation process, and the sedimentation speed is high.
The dosage ratio of the polymeric ferric sulfate to the heavy metal wastewater can be 0.04-0.06 mL: 10mL, such as 0.04 mL: 10mL, 0.045 mL: 10mL, 0.05 mL: 10mL, 0.055 mL: 10mL or 0.06 mL: 10mL, etc., and may be 0.04-0.06 mL: other values in the range of 10 mL.
The free metal ions can be effectively and rapidly flocculated and settled by using the dosage.
The polyacrylamide used in the application is in a solid form, and the dosage ratio of the polyacrylamide to the heavy metal wastewater can be 0.4-0.6 mg: 10mL, such as 0.4 mg: 10mL, 0.45 mg: 10mL, 0.5 mg: 10mL, 0.55 mg: 10mL or 0.6 mg: 10mL, etc., or 0.4-0.6 mg: any other value within the range of 10 mL.
By matching polyacrylamide and polymeric ferric sulfate according to the proportion provided by the application, on one hand, the dosage of the polymeric ferric sulfate can be greatly reduced on the premise of achieving the same water quality; on the other hand, the strength and the settling speed of the flocs can be further improved.
It should be emphasized that the water treatment processes and principles not referred to in this application can be referred to in the art and will not be described in any greater detail herein.
The features and properties of the present invention are described in further detail below with reference to examples.
Experiment I,
(1) Water sample information:
sampling 1 liter, pH 7.5-8, hardness: 103 mg/L.
(2) The experimental process comprises the following steps:
adding 50mL of reclaimed water sludge and 5mL of liquid caustic soda (30%); the mixture was stirred at pH 11 for 5 minutes.
PFS0.05mL and PAM0.5mg are added, the flocculation effect is excellent, and the supernatant is clear.
(3) Experimental supernatant water quality information:
pH 11, turbidity 5.6UNT, hardness 124 mg/L.
Experiment two,
(1) Water sample information:
sampling 1 liter, pH 7.5-8, hardness 103 mg/L.
(2) The experimental process comprises the following steps:
adding sodium hypochlorite 20PPM (available chlorine), and stirring for 20 minutes.
Adding 10mL of reclaimed water sludge and 4mL of liquid caustic soda (30%); the pH was 11.5 and the mixture was stirred for 5 minutes.
PFS0.05ml and PAM0.5mg are added, the flocculation effect is excellent, and the supernatant is clear.
(3) Experimental supernatant water quality information:
pH: 11.5, turbidity: 5.7UNT, hardness: 8.3 mg/l.
Experiment III,
(1) Water sample information:
sampling 1 liter, pH 7.5-8, hardness 103 mg/L.
(2) The experimental process comprises the following steps:
adding sodium hypochlorite 40PPM (effective chlorine), and stirring for 20 minutes.
Adding 20mL of reclaimed water sludge and 3.5mL of liquid caustic soda (30%); the pH was 11.48 and the mixture was stirred for 5 minutes.
PFS0.05ml and PAM0.5mg are added, the flocculation effect is excellent, and the supernatant is clear.
(3) Experimental supernatant water quality information:
the pH was 11.48, the turbidity was 8.4UNT, and the hardness was 62 mg/L.
Experiment four,
(1) Water sample information:
1 liter of sample is taken, the pH is 7.5-8, and the hardness is 154 mg/L.
(2) The experimental process comprises the following steps:
adding 30PPM (effective chlorine) of sodium hypochlorite and stirring for 20 minutes.
Adding 30mL of reclaimed water sludge and 5mL of liquid caustic soda (30%); the pH was 11.56 and the mixture was stirred for 5 minutes.
PFS0.05mL and PAM0.5mg are added, the flocculation effect is excellent, and the supernatant is clear.
(3) Experimental supernatant water quality information:
the pH was 11.46, the turbidity was 4.9UNT, and the hardness was 23.5 mg/L.
Experiment five,
(1) Water sample information:
sampling 1 liter, pH 7.5-8, hardness 115 mg/L.
(2) The experimental process comprises the following steps:
adding sodium hypochlorite 20PPM (available chlorine), and stirring for 20 minutes.
Adding 10mL of reclaimed water sludge and 4.5mL of liquid caustic soda (30%); the pH was 11.55 and the mixture was stirred for 5 minutes.
PFS0.05ml and PAM0.5mg are added, the flocculation effect is excellent, and the supernatant is clear.
(3) Experimental supernatant water quality information:
the pH was 11.5, the turbidity was 5.7UNT, and the hardness was 12 mg/L.
The information on the quality of the supernatant water corresponding to the above experiment is summarized in table 1.
TABLE 1 test results
| Experiment one | Experiment two | Experiment three | Experiment four | Experiment five | |
| Turbidity of water | 5.6 | 8.3 | 8.4 | 4.9 | 5.7 |
| Hardness of | 124 | 5.7 | 62 | 23.5 | 12 |
Therefore, the water inlet hardness of the zero-emission strong brine is as follows: when the water hardness is 103mg/L and a vein breaking and medicine adding system is not used, the water hardness is 124 mg/L. When the vein-breaking medicine-adding device is used, the medicine-adding concentration is as follows: when the water content is 20ppm, the effluent hardness is up to 8.3mg/L, and the effluent effect is optimal.
In conclusion, the substance containing hypochlorite is mixed with the heavy metal wastewater containing the complex to be treated, wherein the sodium hypochlorite has strong oxidizability and can be hydrolyzed to form hypochlorous acid, the hypochlorous acid is further decomposed to form nascent oxygen with strong oxidizability, the stability of the complex existing in the heavy metal wastewater containing the complex can be effectively destroyed, metal ions exist in a free state again, and then the heavy metal wastewater containing the complex is mixed with the flocculating agent, so that the metal ions can be quickly flocculated and settled under the action of the flocculating agent, the hardness and turbidity of the wastewater can be effectively reduced, and the efficiency is high.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for treating the heavy metal wastewater containing the complex is characterized by comprising the following steps of: mixing a substance containing hypochlorite with heavy metal wastewater containing a complex to be treated to obtain a complex breaking system, adjusting the pH of the complex breaking system to 10-11.5, and mixing with a flocculating agent;
the dosage ratio of the substance containing hypochlorite to the heavy metal wastewater is 10-30 ppm: 10 mL;
preferably, the dosage ratio of the hypochlorite-containing substance to the heavy metal wastewater is 20 ppm: 10 mL.
2. The heavy metal wastewater treatment method according to claim 1, wherein the heavy metal wastewater is reclaimed water treated by a phosphorus-containing scale inhibitor.
3. The heavy metal wastewater treatment method according to claim 1 or 2, wherein the hypochlorite-containing substance and the heavy metal wastewater are stirred and mixed at 25 to 30 ℃ for 15 to 25 min.
4. The heavy metal wastewater treatment method according to claim 3, wherein the hypochlorite-containing substance is sodium hypochlorite.
5. The heavy metal wastewater treatment method according to claim 1 or 2, wherein the regulator for adjusting the pH is liquid alkali.
6. The heavy metal wastewater treatment method according to claim 5, wherein the concentration of the liquid caustic soda is 30 to 35 wt%.
7. The heavy metal wastewater treatment method according to claim 5, wherein the complex breaking system and the regulator are stirred and mixed for 5-8min at 25-30 ℃, and then are mixed with the flocculant.
8. The heavy metal wastewater treatment method according to claim 1 or 2, wherein the flocculant comprises polymeric ferric sulfate and polyacrylamide.
9. The heavy metal wastewater treatment method according to claim 8, wherein the dosage ratio of the polymeric ferric sulfate to the heavy metal wastewater is 0.04-0.06 mL: 10 mL.
10. The method according to claim 8, wherein the dosage ratio of the polyacrylamide to the heavy metal wastewater is 0.4-0.6 mg: 10 mL.
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