CN113716635A - Phosphorus removing agent for industrial sewage treatment and use method thereof - Google Patents
Phosphorus removing agent for industrial sewage treatment and use method thereof Download PDFInfo
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- CN113716635A CN113716635A CN202111201160.9A CN202111201160A CN113716635A CN 113716635 A CN113716635 A CN 113716635A CN 202111201160 A CN202111201160 A CN 202111201160A CN 113716635 A CN113716635 A CN 113716635A
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 170
- 239000011574 phosphorus Substances 0.000 title claims abstract description 170
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 92
- 239000010865 sewage Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims abstract description 56
- 239000010842 industrial wastewater Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 238000003754 machining Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 12
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 239000007788 liquid Substances 0.000 claims description 46
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 22
- 239000002699 waste material Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 238000005189 flocculation Methods 0.000 claims description 9
- 230000016615 flocculation Effects 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 230000003311 flocculating effect Effects 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 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 abstract description 21
- 229910000360 iron(III) sulfate Inorganic materials 0.000 abstract description 21
- 239000002351 wastewater Substances 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 24
- 230000000694 effects Effects 0.000 description 24
- 238000002474 experimental method Methods 0.000 description 16
- 235000011121 sodium hydroxide Nutrition 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 7
- -1 ferric iron ions Chemical class 0.000 description 7
- 239000006228 supernatant Substances 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- JRIGSKUONNQDID-UHFFFAOYSA-K [P].[Al](Cl)(Cl)Cl Chemical compound [P].[Al](Cl)(Cl)Cl JRIGSKUONNQDID-UHFFFAOYSA-K 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000539 dimer Substances 0.000 description 2
- 229910001447 ferric ion Inorganic materials 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000013638 trimer Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005595 deprotonation Effects 0.000 description 1
- 238000010537 deprotonation reaction Methods 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
- C02F1/66—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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention provides a phosphorus removal agent for industrial sewage treatment, wherein the industrial sewage is industrial wastewater in the power capacitor industry or the machining industry, the phosphorus removal agent comprises the following raw materials in parts by weight: 40-45 parts of polyferric sulfate, 24-35 parts of polymeric aluminum ferric silicate, 16-23 parts of basic aluminum chloride, 3-5 parts of ferric oxide and 2-4 parts of aluminum oxide. The invention also provides a use method of the phosphorus removal agent for industrial sewage treatment. Compared with the existing common polymeric ferric sulfate or polymeric aluminum chloride dephosphorizing agent, the invention has the advantages of high phosphorus wastewater removal rate of over 99.5 percent in the power capacitor industry and the machining industry, short treatment time, quick response, low cost and simple use method.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and relates to a phosphorus removal agent for industrial sewage treatment and a use method thereof.
Background
The existing commonly used phosphorus removing agent for sewage treatment is polymeric ferric sulfate or polymeric aluminum chloride, which is generally applied to the phosphorus removal of sewage with small total phosphorus concentration of raw water, and for sewage in power capacitor industry and machining industry with large total phosphorus concentration of raw water of wastewater, when the two phosphorus removing agents are independently applied to remove phosphorus, the phosphorus removing effect is not ideal, the two agents cannot be mixed and can quickly become jelly after being mixed, so that two-stage or three-stage phosphorus removal is needed, the polymeric ferric sulfate or polymeric aluminum chloride is added for phosphorus removal in a plurality of times, the final phosphorus removing effect is not ideal, the existing environmental protection requirement cannot be met (the total phosphorus requirement is lower than 0.5mg/L), the sludge amount after treatment is large, and the agent and the cost for treating sludge are high.
Disclosure of Invention
The invention provides a phosphorus removal agent for industrial sewage treatment and a using method thereof, aiming at solving the problem of poor sewage phosphorus removal efficiency in the power capacitor industry and the machining industry.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the phosphorus removing agent for industrial sewage treatment is characterized in that the industrial sewage is industrial wastewater in the power capacitor industry or the machining industry, and the phosphorus removing agent comprises the following raw materials in parts by weight: 40-45 parts of polyferric sulfate, 24-35 parts of polymeric aluminum ferric silicate, 16-23 parts of basic aluminum chloride, 3-5 parts of ferric oxide and 2-4 parts of aluminum oxide.
The invention also provides a use method of the phosphorus removal agent for industrial sewage treatment, which comprises the following steps:
s1: preparing the raw materials according to the mixture ratio of the raw materials, uniformly mixing the raw materials, preparing the mixture into a solution with water according to the mass ratio of 1:3, and adding 0.2-0.5 part by weight of 30% dilute sulfuric acid into the solution to prepare a liquid phosphorus removal agent;
s2: industrial wastewater of the power capacitor industry or the machining industry to be treated is conveyed into a reactor;
s3: adding the liquid phosphorus removal agent prepared in the step S1 into a reactor, and stirring for 2-5min to obtain pretreated waste liquid;
s4: then flocculating and precipitating to obtain the water meeting the discharge standard.
Further, the reactor is a pipeline mixer, a box mixer or a tank mixer.
Further, the step S3 is performed under normal temperature conditions.
Further, the step S4 is to adjust the PH of the pretreated waste liquid to 6 to 7 with sodium hydroxide during the flocculation.
Further, the liquid phosphorus removal agent of the step S3 is used in the industrial wastewater of the power capacitor industry or the mechanical processing industry to be treated according to the phosphorus content of 24.5-27.2 mL/g.
In the phosphorus removing agent, the polyferric sulfate, the polymeric ferric aluminum silicate, the basic aluminum chloride, the ferric oxide and the aluminum oxide in the phosphorus removing agent release ferric iron ions and ferric aluminum ions in a solution state in water to participate in the whole phosphorus removing process, and substances brought into industrial wastewater by the agent can be precipitated and filtered to become sludge without influencing the quality of effluent water. The specific phosphorus removal principle is as follows:
1. while ferric ions in the phosphorus removing agent react with phosphate radicals in the industrial wastewater to generate precipitates, the hydrolysis polymerization product of the ferric ions also plays a role in removing phosphorus through the actions of compressing double electric layers, absorbing electric neutralization, bridging net capture and the like:
(1) the iron ions are hydrolyzed to generate monomers, dimers and trimers. The dimer or trimer is bridged by hydroxyl groups.
(2) The oligomer and the small polymer are quickly generated and dissolved. The formation of the polymer is a continuous process, with the oligomers connected into a spatial three-dimensional structure, which is accompanied by rapid dissolution of the oligomers and small macromolecules.
(3) And (3) forming a large high molecular polymer. Due to the instability of the oligomers, during this period the polymerization reaction is generalized to three mechanistic processes, namely the formation of hydroxyl bridges, oxygen bridges and crystals.
(4) A precipitate formed. The formation of high polymers by hydroxyl bridge linkage followed by maturation to form oxygen bridges is accompanied by a deprotonation process, with the final formation of a precipitate.
2. Trivalent aluminum ions in the phosphorus removing agent are combined with soluble phosphate in the wastewater to react and are converted into non-soluble phosphate precipitate, so that the effect of removing phosphate ions in the wastewater is achieved:
(1) trivalent aluminum reacts with phosphate radical, and meanwhile, the trivalent aluminum is hydrolyzed to generate a mononuclear complex.
(2) The mononuclear complexes are combined through further collision to form polynuclear complexes, the polynuclear complexes have higher positive charges and higher specific surface areas, can be coagulated and precipitated, neutralize the colloidal charges in water, promote rapid destabilization and coagulation of colloids and suspended matters, and remove phosphorus through precipitation.
3. The high molecular polymer formed by iron ions and aluminum ions participating in the phosphorus removal reaction has a chemical adsorption effect on phosphate in the phosphorus-containing wastewater and a precipitation effect on a complex generated by a complex reaction, so that the phosphorus removal effect is improved.
The invention has the beneficial effects that:
1. the invention has the effect of removing organic phosphorus and inorganic phosphorus in industrial wastewater in the power capacitor industry and the machining industry;
2. compared with the existing common polymeric ferric sulfate or polymeric aluminum chloride dephosphorizing agent, the invention has the advantages that the removal rate of high-phosphorus wastewater (the total phosphorus concentration of raw water is more than 150 mg/L) in the power capacitor and machining industry can reach more than 99.5 percent;
3. the invention can reduce the ferric iron after reaction into ferrous iron and iron simple substance, thereby solving the problem of poor water quality and chromaticity after the phosphorus removal of the existing phosphorus removing agent;
4. the application method is simple and quick in effect, and the effect can be seen in 2-5 min;
5. in the dephosphorization process, alkaline regulators such as lime, caustic soda flakes and the like do not need to be added, so that the sludge amount is greatly reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A phosphorus removing agent for industrial sewage treatment is industrial wastewater of the power capacitor industry or the machining industry, and comprises the following raw materials in parts by weight: 40-45 parts of polyferric sulfate, 24-35 parts of polymeric aluminum ferric silicate, 16-23 parts of basic aluminum chloride, 3-5 parts of ferric oxide and 2-4 parts of aluminum oxide.
The total phosphorus concentration of raw water of the industrial sewage is more than 150 mg/L.
The invention also provides a use method of the phosphorus removal agent for industrial sewage treatment, which comprises the following steps:
s1: preparing the raw materials according to the mixture ratio of the raw materials, uniformly mixing the raw materials, preparing the mixture into a solution with water according to the mass ratio of 1:3, and adding 0.2-0.5 part by weight of 30% dilute sulfuric acid into the solution to prepare a liquid phosphorus removal agent;
s2: industrial wastewater of the power capacitor industry or the machining industry to be treated is conveyed into a reactor;
s3: adding the liquid phosphorus removal agent prepared in the step S1 into a reactor, and stirring for 2-5min at normal temperature to obtain pretreated waste liquid;
s4: and (3) adjusting the pH value of the pretreated waste liquid to 6-7 by using sodium hydroxide, and then performing flocculation precipitation to obtain water meeting the discharge standard.
The reactor is a pipeline mixer, a box mixer or a tank mixer.
The liquid phosphorus removal agent of the step S3 is used in the industrial wastewater of the power capacitor industry or the mechanical processing industry to be treated according to the phosphorus content of 24.5-27.2 mL/g.
When the phosphorus removing agent is used, the raw materials are mixed and added with water to prepare the liquid phosphorus removing agent, and the effect of adding 30% dilute sulfuric acid is to realize the acid environment of the product, ensure the stability of the product and prolong the storage period of the liquid phosphorus removing agent.
In addition, if the content of polymeric ferric sulfate in the phosphorus removing agent is higher than 45 parts, the amount of 30% dilute sulfuric acid required to be added exceeds 0.5 part, so that the acidity value of pretreated water is seriously lower, a large amount of alkali substances are required for neutralization subsequently, and the higher salinity in the water is, so that the activity of the strain of the subsequent biochemical reaction is reduced, and the whole water treatment effect is influenced. Therefore, the polymeric ferric sulfate is added in an amount of 40-45 parts. The addition of the polyaluminum ferric silicate mainly considers that the water purification effect is better, but the addition of the polyaluminum ferric silicate is necessary for facilitating the obtainment of relatively better water quality conditions and precipitates which are easier to filter after phosphorus removal due to the fact that the polyaluminum ferric silicate is a phosphorus removal agent and mainly highlights the phosphorus removal effect; meanwhile, the polymeric aluminum ferric silicate is of a polymeric molecular structure and can promote the dephosphorization effect under the combined action with the polymeric ferric sulfate.
For the quantification of the basic aluminum chloride, the performance of the basic aluminum chloride is similar to that of polymeric ferric sulfate, and the basic aluminum chloride can be independently used as a phosphorus removal agent, but the polymeric ferric sulfate is superior to the basic aluminum chloride in the aspect of phosphorus removal effect. Therefore, the minimum combined amount of basic aluminum chloride and polymeric aluminum ferric silicate is consistent with the minimum 40 parts of polymeric ferric sulfate in view of cost and dephosphorization effect. The phosphorus removal effect is affected by the excessively large addition amount of the basic aluminum chloride and the polymeric aluminum ferric silicate, and on the premise of ensuring the same phosphorus removal effect, the addition amount of the basic aluminum chloride and the polymeric aluminum ferric silicate is excessively small, the addition amount of the polymeric ferric sulfate is increased, and the overall cost is increased due to the high cost of the polymeric ferric sulfate. Meanwhile, the minimum part of the polymeric aluminum ferric silicate is not less than the maximum part of the basic aluminum chloride, and if the part of the polymeric aluminum ferric silicate is too low, the coagulation-aiding precipitation effect is influenced. Under the coexistence of ferric oxide and aluminum oxide and 30% dilute sulfuric acid, the hydrolysis of polymeric ferric sulfate is more easily inhibited. The addition amounts of the iron oxide and the aluminum oxide are 3-5 parts and 2-4 parts respectively.
Therefore, based on 40-45 parts of the set polymeric ferric sulfate, the maximum combination amount of the polymeric ferric sulfate and the polymeric aluminum ferric silicate is controlled to be 80 parts, and the two chemical agents exceed 80 parts, which causes waste of cost, so that the maximum part of the polymeric aluminum ferric silicate is set to be 35 parts, the minimum part is set to be 24 parts, the minimum part of basic aluminum chloride is set to be 16, and 24+16 is set to be 40; the minimum part of the polymeric aluminum ferric silicate is larger than the maximum part of the basic aluminum chloride, namely 24 is larger than 23, and 23 is selected as the maximum part of the basic aluminum chloride.
Experiment one, the liquid phosphorus removal agent prepared in example 1 and the common phosphorus removal agent liquid polyaluminium chloride are subjected to a single-stage phosphorus removal comparative experiment in a laboratory:
example 1
A phosphorus removing agent for industrial sewage treatment is industrial wastewater of the power capacitor industry or the machining industry, and comprises the following raw materials in parts by weight: 45 parts of polyferric sulfate, 24 parts of polyaluminum ferric silicate, 23 parts of basic aluminum chloride, 5 parts of ferric oxide and 3 parts of aluminum oxide.
Preparing the raw materials according to the mixture ratio of the raw materials, uniformly mixing the raw materials, preparing the mixture into a solution with water according to the mass ratio of 1:3, and adding 0.3 part by weight of 30% dilute sulfuric acid into the solution to prepare a liquid phosphorus removing agent;
taking industrial wastewater of the machining industry as raw water, wherein the total phosphorus of the raw water is 186mg/L, the COD value (chemical oxygen demand) is 350, totally carrying out 4 groups of experiments, taking 4 500mL beakers which are respectively marked as the number 1, the number 2, the number 3 and the number 4, adding 500mL of raw water into each beaker, respectively adding the liquid phosphorus removal agent in the embodiment 1 into the beakers from the number 1 to the number 4, and sequentially adding 3mL, 4mL, 5mL and 6mL of the liquid phosphorus removal agent; placing the beaker on a rotor stirrer, and stirring for 2 minutes at normal temperature to obtain pretreated waste liquid; adjusting the pH value of the pretreated waste liquid to 6-7 with sodium hydroxide, standing for flocculation, and taking the supernatant to determine the total phosphorus and COD value.
Comparative example 1
In the comparative example 1, liquid polyaluminum chloride is used as a phosphorus removing agent for comparison, raw water is the same as that in the example 1, 4 experiments are carried out, 4 500mL beakers are respectively marked as 5, 6, 7 and 8, 500mL of raw water is added into each beaker, the phosphorus removing agent in the comparative example 1 is respectively added into the beakers from 5 to 8, and the adding amount is 3mL, 4mL, 5mL and 6mL in sequence; placing the beaker on a rotor stirrer, and stirring for 5 minutes at normal temperature to obtain pretreated waste liquid; adjusting the pH value of the pretreated waste liquid to 6-7 with sodium hydroxide, standing for flocculation, and taking the supernatant to determine the total phosphorus and COD value.
The phosphorus removal results of the phosphorus removal agents of example 1 and comparative example 1 are shown in table 1, and are analyzed by the experimental data of table 1: the phosphorus removal agent disclosed by the embodiment 1 of the invention is suitable for removing phosphorus from industrial wastewater in the machining industry, when the addition amount of the phosphorus removal agent is 5mL and 6mL (numbered 3 and numbered 4 experimental groups), the total phosphorus can meet the emission requirement, and the total phosphorus removal rate can reach more than 99.5%. On the contrary, the common polymeric aluminum chloride dephosphorization reagent has low total phosphorus removal efficiency (the maximum phosphorus removal efficiency in a comparative experiment under experimental conditions is 60%) for raw water by single-stage dephosphorization, and the treatment result does not meet the requirement of national regulation environmental protection discharge index. From the view of treatment cost, the invention can also achieve relatively good cost control on the premise of completely meeting the requirement of environmental protection and emission. From the treatment time, the phosphorus removing agent in the embodiment 1 can complete phosphorus removal within 2min and reach the standard, the phosphorus removal in the comparative example 1 needs at least 5min, and the phosphorus removal standard can not be quickly reached by increasing the dosage of the agent and prolonging the treatment time.
TABLE 1 comparison of phosphorus removal Effect of phosphorus removal agent in example 1 and comparative example 1
| Item | Raw water | Number 1 | Number 2 | Number 3 | Number 4 | Number 5 | Number 6 | Number 7 | Number 8 |
| Total phosphorus (mg/L) | 186 | 1.23 | 0.70 | 0.40 | 0.20 | 142 | 120 | 100 | 80 |
| COD | 350 | 150 | 100 | 80 | 60 | 330 | 260 | 200 | 100 |
| Cost of treatment (Yuan/ton) | - | 1.40 | 1.86 | 2.33 | 2.80 | 1.30 | 1.73 | 2.17 | 2.60 |
| Treatment time (min) | - | 2 | 2 | 2 | 2 | 5 | 5 | 5 | 5 |
Experiment two, the liquid phosphorus removal agent prepared in the example 2 and the common phosphorus removal agent poly-ferric chloride are subjected to a single-stage phosphorus removal comparative experiment in a laboratory:
example 2
A phosphorus removing agent for industrial sewage treatment is industrial wastewater of the power capacitor industry or the machining industry, and comprises solid components, water and dilute sulfuric acid, wherein the solid components comprise the following raw materials in parts by weight: 45 parts of polyferric sulfate, 30 parts of polyaluminum ferric silicate, 16 parts of basic aluminum chloride, 5 parts of ferric oxide and 4 parts of aluminum oxide;
preparing the raw materials according to the mixture ratio of the raw materials, uniformly mixing the raw materials, preparing the mixture into a solution with water according to the mass ratio of 1:3, and adding 0.5 part by weight of 30% dilute sulfuric acid into the solution to prepare the liquid phosphorus removing agent.
Taking industrial wastewater of the machining industry as raw water, wherein the total phosphorus of the raw water is 195mg/L, the COD value is 360, totally carrying out 4 groups of experiments, taking 4 500mL beakers which are respectively marked as the number 1, the number 2, the number 3 and the number 4, adding 500mL of raw water into each beaker, and respectively adding the phosphorus removing agent of the embodiment 2 into the beakers from the number 1 to the number 4 in the sequence of 3mL, 4mL, 5mL and 6 mL; placing the beaker on a rotor stirrer, stirring for 2 minutes at normal temperature, standing for flocculation and precipitation to obtain pretreated waste liquid; adjusting the pH value of the pretreated waste liquid to 6-7 by using sodium hydroxide, and taking supernatant liquid to measure the total phosphorus and COD value.
Comparative example 2
Comparing by using liquid polymeric ferric sulfate as a phosphorus removing agent, wherein raw water is the same as that in example 2, 4 experiments are carried out, 4 500mL beakers are respectively marked as 5, 6, 7 and 8, 500mL of raw water is added into each beaker, the phosphorus removing agent in the comparative example 2 is respectively added into the beakers from 5 to 8, and the adding amount is 3mL, 4mL, 5mL and 6mL in sequence; placing the beaker on a rotor stirrer, and stirring for 5 minutes at normal temperature to obtain pretreated waste liquid; adjusting the pH value of the pretreated waste liquid to 6-7 with sodium hydroxide, standing for flocculation, and taking the supernatant to determine the total phosphorus and COD value.
The phosphorus removal results of the phosphorus removal agents of example 2 and comparative example 2 are shown in table 2, and are analyzed by the experimental data of table 2: the phosphorus removal agent of the embodiment 2 is suitable for removing phosphorus from industrial wastewater in the machining industry, when the addition amount of the phosphorus removal agent is 5mL and 6mL (numbered 3 and numbered 4 experimental groups), the total phosphorus can meet the emission requirement, and the total phosphorus removal rate can reach more than 99.5%. On the contrary, the polymeric ferric sulfate phosphorus removal agent in the comparative example 2 has low total phosphorus removal efficiency (the maximum phosphorus removal efficiency in the comparative experiment under the experimental condition is 64%) for the raw water by single-stage phosphorus removal, and the treatment result does not meet the requirement of the national regulation environmental protection discharge index. From the view of treatment cost, the invention can also achieve relatively good cost control on the premise of completely meeting the requirement of environmental protection and emission. From the treatment time, the phosphorus removal agent of the embodiment 2 can complete phosphorus removal within 2min and reach the standard, the comparative example 2 needs at least 5min to complete phosphorus removal, and the phosphorus removal standard can not be quickly reached by increasing the dosage of the agent and prolonging the treatment time.
TABLE 2 comparison of phosphorus removal effect of phosphorus removal agent in example 2 and comparative example 2
| Item | Raw water | Number 1 | Number 2 | Number 3 | Number 4 | Number 5 | Number 6 | Number 7 | Number 8 |
| Total phosphorus (mg/L) | 195 | 1.24 | 0.71 | 0.40 | 0.20 | 130 | 110 | 92 | 70 |
| COD | 360 | 149 | 100 | 82 | 61 | 335 | 270 | 210 | 115 |
| Cost of treatment (Yuan/ton) | - | 1.42 | 1.89 | 2.37 | 2.84 | 1.55 | 2.07 | 2.58 | 3.10 |
| Treatment time (min) | - | 2 | 2 | 2 | 2 | 5 | 5 | 5 | 5 |
Experiment III, a two-stage dephosphorization contrast experiment of the liquid dephosphorization agent prepared in the example 3 and common dephosphorization agents, namely polyaluminium chloride and polyferric sulfate:
example 3
A phosphorus removing agent for industrial sewage treatment is industrial wastewater of the power capacitor industry or the machining industry, and comprises solid components, water and dilute sulfuric acid, wherein the solid components comprise the following raw materials in parts by weight: 40 parts of polyferric sulfate, 35 parts of polyaluminum ferric silicate, 20 parts of basic aluminum chloride, 3 parts of ferric oxide and 2 parts of aluminum oxide;
preparing the raw materials according to the mixture ratio of the raw materials, uniformly mixing the raw materials, preparing the mixture into a solution with water according to the mass ratio of 1:3, and adding 0.2 part by weight of 30% dilute sulfuric acid into the solution to prepare the liquid phosphorus removing agent.
Taking industrial wastewater in the machining industry as raw water, wherein the total phosphorus of the raw water is 206mg/L, the COD value is 375, totally carrying out 4 groups of experiments, taking 4 500mL beakers which are respectively marked as the number 1, the number 2, the number 3 and the number 4, adding 500mL of raw water into each beaker, respectively adding the phosphorus removing agent in the embodiment 3 into the beakers from the number 1 to the number 4, and sequentially adding 3mL, 4mL, 5mL and 6mL of phosphorus removing agent; placing the beaker on a rotor stirrer, stirring for 2 minutes at normal temperature, standing for flocculation and precipitation to obtain pretreated waste liquid; adjusting the pH value of the pretreated waste liquid to 6-7 by using sodium hydroxide, and taking supernatant liquid to measure the total phosphorus and COD value.
Comparative example 3
And (3) adopting two-stage dephosphorization: respectively adopting a liquid polymeric ferric sulfate phosphorus removal agent and a liquid polymeric aluminum chloride phosphorus removal agent to sequentially remove phosphorus from raw water, wherein the raw water is the same as that in example 3, 4 groups of experiments are carried out, 4 500mL beakers are respectively marked as No. 5, No. 6, No. 7 and No. 8, 500mL of raw water is added into each beaker, 3mL, 4mL, 5mL and 6mL of liquid polymeric ferric sulfate are respectively added into the beakers from No. 5 to No. 8, the adding amount is 3mL, 4mL, 5mL and 6mL in sequence, the beakers are placed on a rotor stirrer, stirring reaction is carried out at normal temperature for 5 minutes, then liquid polymeric aluminum chloride is added into each beaker, the adding amount is 3mL, 4mL, 5mL and 6mL in sequence, and stirring reaction is carried out at normal temperature for 5 minutes; standing for flocculation and precipitation to obtain pretreated waste liquid; adjusting the pH value of the pretreated waste liquid to 6-7 by using sodium hydroxide, and taking supernatant liquid to measure the total phosphorus and COD value.
The phosphorus removal results of the phosphorus removal agents of example 3 and comparative example 3 are shown in table 3, and are analyzed by the experimental data of table 3: the phosphorus removal agent of the embodiment 3 of the invention is suitable for removing phosphorus from industrial wastewater in the machining industry, when the addition amount of the phosphorus removal agent is 5mL and 6mL (numbered 3 and numbered 4 experimental groups), the total phosphorus can meet the emission requirement, and the total phosphorus removal rate can reach more than 99.5%. In the comparative example 3, the existing common polymeric ferric sulfate and polymeric aluminum chloride phosphorus removal agents are adopted to carry out two-stage phosphorus removal, the total phosphorus removal efficiency of the raw water is greatly improved compared with the data of the comparative examples 1 and 2 of the experiment I, but the phosphorus removal efficiency is still less than 90% (the maximum phosphorus removal efficiency of the two-stage phosphorus removal in the comparative experiment under the experimental condition is 85%), and the requirement of the current national discharge standard is difficult to meet. From the view of treatment cost, on the premise of completely meeting the requirement of environmental protection and discharge, the invention can also achieve relatively good cost control, and the phosphorus removal cost is about 2 times of that of the embodiment 3 by adopting a two-stage phosphorus removal mode of polymeric ferric sulfate and polymeric aluminum sulfate. From the treatment time, the phosphorus removing agent of the embodiment 3 can complete phosphorus removal within 2min and reach the standard, and the comparative example 3 needs at least 10min to complete phosphorus removal, so that the treatment time is longer.
TABLE 3 comparison of phosphorus removal Effect of phosphorus removal agent in example 3 and comparative example 3
| Item | Raw water | Number 1 | Number 2 | Number 3 | Number 4 | Number 5 | Number 6 | Number 7 | Number 8 |
| Total phosphorus (mg/L) | 206 | 1.22 | 0.72 | 0.41 | 0.21 | 86 | 62 | 45 | 31 |
| COD | 375 | 160 | 122 | 88 | 65 | 330 | 260 | 200 | 100 |
| Cost of treatment (Yuan/ton) | - | 1.56 | 2.08 | 2.60 | 3.12 | 2.85 | 3.80 | 4.75 | 5.70 |
| Treatment time (min) | - | 2 | 2 | 2 | 2 | 10 | 10 | 10 | 10 |
When the industrial wastewater is industrial wastewater of the power capacitor industry, and the total phosphorus concentration of raw water is similar, the treatment results are similar to the treatment results of the industrial wastewater of the machining industry of the embodiments 1-3 of the invention, and therefore, the specific embodiments and the comparative examples are not described in detail.
The total phosphorus emission index of the industrial wastewater in the existing organic processing industry and the power capacitor industry can not meet the environmental protection emission requirement basically (the total phosphorus requirement is lower than 0.5 mg/L). If the discharge reaches the standard, three-stage or even four-stage phosphorus removal is needed, and the cost is more than 6 yuan per ton of water. Aiming at the high-phosphorus wastewater (the total phosphorus concentration of raw water is more than 150 mg/L) in the power capacitor and machining industries, the phosphorus removal agent has the removal rate of basically more than 99.5 percent, and has the advantages of good phosphorus removal effect, short treatment time, simple use method, high efficiency and low cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The phosphorus removing agent for industrial sewage treatment is characterized in that the industrial sewage is industrial wastewater in the power capacitor industry or the machining industry, and the phosphorus removing agent comprises the following raw materials in parts by weight: 40-45 parts of polyferric sulfate, 24-35 parts of polymeric aluminum ferric silicate, 16-23 parts of basic aluminum chloride, 3-5 parts of ferric oxide and 2-4 parts of aluminum oxide.
2. The phosphorus removal agent for industrial sewage treatment as claimed in claim 1, wherein the industrial sewage is industrial wastewater of power capacitor industry or machining industry, the phosphorus removal agent comprises the following raw materials in parts by weight: 45 parts of polyferric sulfate, 24 parts of polyaluminum ferric silicate, 23 parts of basic aluminum chloride, 5 parts of ferric oxide and 3 parts of aluminum oxide.
3. The phosphorus removal agent for industrial sewage treatment as claimed in claim 1, wherein the industrial sewage is industrial wastewater of power capacitor industry or machining industry, the phosphorus removal agent comprises the following raw materials in parts by weight: 45 parts of polyferric sulfate, 30 parts of polyaluminum ferric silicate, 16 parts of basic aluminum chloride, 5 parts of ferric oxide and 4 parts of aluminum oxide.
4. The phosphorus removal agent for industrial sewage treatment as claimed in claim 1, wherein the industrial sewage is industrial wastewater of power capacitor industry or machining industry, the phosphorus removal agent comprises the following raw materials in parts by weight: 40 parts of polyferric sulfate, 35 parts of polyaluminum ferric silicate, 20 parts of basic aluminum chloride, 3 parts of ferric oxide and 2 parts of aluminum oxide.
5. The use method of the phosphorus removal agent for industrial sewage treatment as claimed in claim 1, 2, 3 or 4, specifically comprising the following steps:
s1: preparing the raw materials according to the mixture ratio of the raw materials, uniformly mixing the raw materials, preparing the mixture into a solution with water according to the mass ratio of 1:3, and adding 0.2-0.5 part by weight of 30% dilute sulfuric acid into the solution to prepare a liquid phosphorus removal agent;
s2: industrial wastewater of the power capacitor industry or the machining industry to be treated is conveyed into a reactor;
s3: adding the liquid phosphorus removal agent prepared in the step S1 into a reactor, and stirring for 2-5min to obtain pretreated waste liquid;
s4: then flocculating and precipitating to obtain the water meeting the discharge standard.
6. The method of claim 5, wherein the reactor is a pipeline mixer, a box mixer or a tank mixer.
7. The method of claim 5, wherein the step S3 is performed under stirring at normal temperature.
8. The method of claim 5, wherein the pH of the pre-treated effluent is adjusted to 6-7 with sodium hydroxide during flocculation precipitation in step S4.
9. The method for using the phosphorus removing agent for industrial sewage treatment as claimed in claim 5, wherein the liquid phosphorus removing agent of step S3 is used in an amount of 24.5-27.2mL/g in terms of phosphorus content in industrial wastewater of power capacitor industry or machining industry to be treated.
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