CN109806890A - A kind of application method except phosphorus catalyst and comprising dephosphorization agent and dephosphorization agent except phosphorus catalyst for chemical nickle-plating wastewater - Google Patents
A kind of application method except phosphorus catalyst and comprising dephosphorization agent and dephosphorization agent except phosphorus catalyst for chemical nickle-plating wastewater Download PDFInfo
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Abstract
The invention discloses a kind of application methods except phosphorus catalyst and comprising dephosphorization agent and dephosphorization agent except phosphorus catalyst for chemical nickle-plating wastewater, belong to water-treatment technology field, it is a kind of to remove phosphorus catalyst for chemical nickle-plating wastewater, based on parts by weight, it is mixed by following component: 40-50 parts of ferrous sulfate, active 40-50 parts of powdered carbon, 5-10 parts of manganese dioxide and semiconductor powder 5-10 parts waste and old.The present invention can replace the ferrous sulfate medicament in common Fenton reagent completely, when handling the equivalent waste water under same total phosphorus concentration, except the 30-50% that the dosage of phosphorus catalyst is only traditional ferrous sulfate dosage in the present invention, and the sludge quantity for reacting generation is only 20% or so that common Fenton reagent generates sludge quantity, production cost can be reduced and improve working efficiency.
Description
Technical field
The present invention relates to water-treatment technology fields, more specifically, it is related to a kind of dephosphorization for chemical nickle-plating wastewater
Catalyst and comprising except phosphorus catalyst dephosphorization agent and dephosphorization agent application method.
Background technique
Chemical nickel plating is the amorphous deposit produced with collective effects such as nickel salt and hypophosphites, is a kind of surface treatment skill
Art is widely used in the fields such as electronics, petroleum, computer and automobile；Due to being needed when chemical nickel plating using reducing agent hypophosphorous acid
Sodium and sodium phosphite, therefore contain the higher hypophosphite ion of content and orthophosphite ions in chemical nickle-plating wastewater, and
The presence of phosphonium ion can cause the eutrophication of water body, influence ecological environment, it is therefore necessary to the phosphonium ion in nickel-plating waste water into
Row processing.
In the method for secondary/phosphite in existing processing waste water, comparative maturity is Fenton oxidation method (Fenton),
Fenton oxidation method refers to using ferrous ion as catalyst, the wastewater treatment method of chemical oxidation is carried out with hydrogen peroxide, by ferrous iron
The system of ion and hydrogen peroxide composition is also referred to as Fenton reagent；Its reaction mechanism is in Fe2+Catalysis under, make H202It generates strong
The hydroxyl radical free radical (OH) of oxidisability, can not only remove the high-enriched organics in chemical nickle-plating wastewater, can also aoxidize
Secondary/phosphite, to have the function that removal time/phosphite.
But there is also some defects in actual use for common Fenton oxidation method (Fenton), due to the mistake in reaction
Fe in journey2+It is oxidized to Fe3+, and Fe3+It can be with the OH in system-In conjunction with generating a large amount of Fe (OH)3Precipitating, this causes handling
A large amount of sludge can be generated when waste water, increases subsequent treatment process, reduce working efficiency.
Summary of the invention
Phosphorus catalyst is removed for chemical nickle-plating wastewater one of the objects of the present invention is to provide a kind of, passes through each component
Mutual cooperation, have well synergistic effect, can completely replace common Fenton reagent in ferrous sulfate medicament, handle
When equivalent waste water under same total phosphorus concentration, except the dosage of phosphorus catalyst is only the 30- of traditional ferrous sulfate dosage in the present invention
50%, and the sludge quantity for reacting generation is only 20% or so that common Fenton reagent generates sludge quantity, can reduce and be produced into
This, and working efficiency can be improved.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of chemical nickle-plating wastewater is mixed based on parts by weight by following component except phosphorus catalyst: ferrous sulfate 40-
50 parts, active 40-50 parts of powdered carbon, 5-10 parts of manganese dioxide and semiconductor powder 5-10 parts waste and old.
It is mixed with ferrous sulfate, active powdered carbon, manganese dioxide and waste and old semiconductor powder by using above-mentioned technical proposal
Closing the obtained phosphorus catalyst that removes has synergistic effect, and the efficiency that hydrogen peroxide generates hydroxyl radical free radical can be improved, improve hydrogen peroxide
Utilization rate, the ferrous sulfate medicament in common Fenton reagent, the equivalent in the case where handling same total phosphorus concentration can be replaced completely
When waste water, except the dosage of phosphorus catalyst is only the 30-50% of traditional ferrous sulfate dosage in the present invention, and the dirt of generation is reacted
Mud amount is only 20% or so that common Fenton reagent generates sludge quantity, can reduce production cost and improve working efficiency.
Further, the waste and old semiconductor powder is one of semiconductor containing gallium, germanium semiconductor or theirs is compound.
By using above-mentioned technical proposal, semiconductor containing gallium and germanium semiconductor have the function of excitation wavelength, using containing gallium
What semiconductor or germanium semiconductor and ferrous sulfate, active powdered carbon and manganese dioxide formed removes phosphorus catalyst, has between each component
There is good synergistic effect, the efficiency that hydrogen peroxide generates hydroxyl radical free radical can be improved, so that the dosage for removing phosphorus catalyst is reduced,
Reduce the production quantity of sludge.
Further, the semiconductor containing gallium is gallium nitride semiconductor.
By using above-mentioned technical proposal, the catalysis effect except phosphorus catalyst is can be improved in the gallium element in gallium nitride semiconductor
Rate, and new pollution will not be caused to waste water, there is synergistic effect with ferrous sulfate, active powdered carbon and manganese dioxide.
Further, the partial size of the waste and old semiconductor powder is 30-200 μm.
By using above-mentioned technical proposal, by the size controlling of waste and old semiconductor powder at 30-200 μm, disperse convenient for it,
Be conducive to improve waste water treatment efficiency.
Further, the waste and old semiconductor powder is prepared with the following method: taking waste and old semiconductor containing gallium or/and waste and old
Germanium semiconductor after passing it through crushing, grinding and sieving, obtains the waste and old semiconductor powder that partial size is 30-200 μm.
By using above-mentioned technical proposal, the processing method of waste and old semiconductor is simply easily operated, can improve dephosphorization and urge
The dephosphorization efficiency of agent, and waste and old semiconductor can be re-used, realize the recycling of resource.
Further, the partial size of the active powdered carbon is 100-400 μm.
By using above-mentioned technical proposal, the active powdered carbon that partial size is 30-200 μm has large specific surface area, adsorption capacity
Strong advantage generates the hydroxyl of strong oxidizing property when that will remove phosphorus catalyst traditional ferrous sulfate and hydrogen peroxide is replaced to be used cooperatively
Macromolecular in waste water can be decomposed into small molecule by base free radical, and the small molecule being decomposed at this time can be by quickly by active carbon
Powder is adsorbed, so as to improve the efficiency of wastewater treatment.
The second object of the present invention is to provide a kind of dephosphorization agent comprising removing phosphorus catalyst.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of dephosphorization agent comprising removing phosphorus catalyst, is (3-5) by weight ratio: 10 mixed with hydrogen peroxide except phosphorus catalyst and
At.
By using above-mentioned technical proposal, since the phosphorus catalyst that removes of the invention has efficient catalytic efficiency, and it is traditional
Ferrous sulfate and hydrogen peroxide composition Fenton reagent in, the weight ratio of ferrous sulfate and hydrogen peroxide is 1:1, therefore of the invention
Except the dosage of phosphorus catalyst is significantly lower than the dosage of traditional ferrous sulfate, the cost of raw material can be not only reduced, but also can
To reduce the yield of sludge.
Further, the mass fraction of the hydrogen peroxide is 30%.
By using above-mentioned technical proposal, use mass fraction for 30% hydrogen peroxide, it is from a wealth of sources, be catalyzed with dephosphorization
When agent is used cooperatively, the efficiency with higher for generating hydroxyl radical free radical.
The third object of the present invention is to provide a kind of application method of dephosphorization agent.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of application method of dephosphorization agent, includes the following steps:
S1: its pH value is adjusted to 3-5 with acid by chemical nickle-plating wastewater to be processed；
S2: being added dephosphorization agent in the chemical nickle-plating wastewater after adjusting pH into S1, stir 1-2h, obtains pretreatment waste liquid；
S3: being adjusted to 10-12 for the pH for pre-processing waste liquid with calcium oxide, flocculant be then added, heavy in waste liquid by pre-processing
After starch separation, the water for meeting discharge standard can be obtained.
It,, can effective removal using dephosphorization agent of the invention under acidic environment by using above-mentioned technical proposal
Secondary/phosphite in nickel-plating waste water is learned, the total phosphorus content in waste water is reduced, and the COD value of waste water can be reduced, passes through wadding
The cooperation of solidifying agent, can reduce the suspended matter in waste water, so that waste water can achieve discharge standard.
Further, the flocculant is polyacrylamide.
By using above-mentioned technical proposal, the specific good flocculating effect of polyacrylamide can be agglomerated in waste water and be suspended
Object improves water treatment effect.
In conclusion the present invention has the advantages that compared with the prior art
1. with ferrous sulfate, active powdered carbon, manganese dioxide and waste and old semiconductor powder be mixed to get except phosphorus catalyst has
Synergistic effect can be improved the efficiency that hydrogen peroxide generates hydroxyl radical free radical, improve the utilization rate of hydrogen peroxide, can replace completely general
Ferrous sulfate medicament in logical Fenton reagent, when handling the equivalent waste water under same total phosphorus concentration, dephosphorization catalysis in the present invention
The dosage of agent is only the 30-50% of traditional ferrous sulfate dosage, and the sludge quantity for reacting generation is only that common Fenton reagent produces
20% or so of primary sludge amount can reduce production cost and improve working efficiency；
2. semiconductor containing gallium and germanium semiconductor have the function of excitation wavelength, sub- using semiconductor containing gallium or germanium semiconductor and sulfuric acid
What iron, active powdered carbon and manganese dioxide formed removes phosphorus catalyst, has synergistic effect well between each component, can be improved
Hydrogen peroxide generates the efficiency of hydroxyl radical free radical, to reduce the dosage for removing phosphorus catalyst, reduces the production quantity of sludge；
3. gallium nitride semiconductor and gallium phosphide semiconductor are common semiconductor containing gallium, the source obtained is than wide, cost
It is relatively low, production cost can be reduced；And new pollution will not be caused to waste water, with ferrous sulfate, active powdered carbon and two
The fiting effect of manganese oxide is preferable.
Specific embodiment
Invention is further described in detail below.
One, the preparation example of waste and old semiconductor powder
Preparation example 1: taking waste and old gallium nitride semiconductor, and after passing it through crushing, grinding and sieving, obtaining partial size is 30-200 μm
Waste and old semiconductor powder.
Preparation example 2: taking waste and old germanium semiconductor, and after passing it through crushing, grinding and sieving, obtaining partial size is 30-200 μm
Waste and old semiconductor powder.
Preparation example 3: taking waste and old gallium nitride semiconductor and waste and old germanium semiconductor, after passing it through crushing, grinding and sieving,
Obtain the waste and old semiconductor powder that partial size is 30-200 μm.
Two, embodiment
Embodiment 1: it is a kind of for chemical nickle-plating wastewater except phosphorus catalyst is with the following method prepared: take ferrous sulfate
40kg, active powdered carbon 40kg, the manganese dioxide 5kg that partial size is 100-400 μm and waste and old semiconductor powder (being selected from preparation example 1)
5kg is uniformly mixed, and can be obtained except phosphorus catalyst.
Embodiment 2: it is a kind of for chemical nickle-plating wastewater except phosphorus catalyst is with the following method prepared: take sulfuric acid sub-
Iron 45kg, active powdered carbon 45kg, the manganese dioxide 7.5kg that partial size is 100-400 μm and waste and old semiconductor powder are (selected from preparation
Example 2) 7.5kg be uniformly mixed, can be obtained except phosphorus catalyst.
Embodiment 3: it is a kind of for chemical nickle-plating wastewater except phosphorus catalyst is with the following method prepared: take sulfuric acid sub-
Iron 50kg, active powdered carbon 50kg, the manganese dioxide 10kg that partial size is 100-400 μm and waste and old semiconductor powder are (selected from preparation
Example 3) 10kg be uniformly mixed, can be obtained except phosphorus catalyst.
Embodiment 4: a kind of dephosphorization agent is prepared with the following method: being 3:10 except phosphorus catalyst (choosing by weight ratio
From
Embodiment 1) it is mixed with hydrogen peroxide, wherein the mass fraction of hydrogen peroxide is 30%.
Embodiment 5: a kind of dephosphorization agent is prepared with the following method: being 4:10 except phosphorus catalyst (choosing by weight ratio
From
Embodiment 2) it is mixed with hydrogen peroxide, wherein the mass fraction of hydrogen peroxide is 30%.
Embodiment 6: a kind of dephosphorization agent is prepared with the following method: being 5:10 except phosphorus catalyst (choosing by weight ratio
From
Embodiment 3) it is mixed with hydrogen peroxide, wherein the mass fraction of hydrogen peroxide is 30%.
Embodiment 7: a kind of application method of dephosphorization agent: include the following steps:
S1: its pH value is adjusted to 3-5 with hydrochloric acid by chemical nickle-plating wastewater to be processed；
S2: dephosphorization agent (being selected from embodiment 4) is added in the chemical nickle-plating wastewater after adjusting pH into S1, stirs 1h, obtains pre- place
Manage waste liquid；
S3: being adjusted to 10-12 for the pH for pre-processing waste liquid with calcium oxide, after pre-processing the separation of the sediment in waste liquid
Obtain the water for meeting discharge standard.
Embodiment 8: a kind of application method of dephosphorization agent: include the following steps:
S1: its pH value is adjusted to 3-5 with hydrochloric acid by chemical nickle-plating wastewater to be processed；
S2: dephosphorization agent (being selected from embodiment 5) is added in the chemical nickle-plating wastewater after adjusting pH into S1, stirs 1.5h, obtains pre-
It disposes waste liquid；
S3: being adjusted to 10-12 for the pH for pre-processing waste liquid with calcium oxide, after pre-processing the separation of the sediment in waste liquid
Obtain the water for meeting discharge standard.
Embodiment 9: a kind of application method of dephosphorization agent: include the following steps:
S1: its pH value is adjusted to 3-5 with hydrochloric acid by chemical nickle-plating wastewater to be processed；
S2: dephosphorization agent (being selected from embodiment 6) is added in the chemical nickle-plating wastewater after adjusting pH into S1, stirs 2h, obtains pre- place
Manage waste liquid；
S3: being adjusted to 10-12 for the pH for pre-processing waste liquid with calcium oxide, after pre-processing the separation of the sediment in waste liquid
Obtain the water for meeting discharge standard.
Embodiment 10: the present embodiment and embodiment 7 the difference is that, the pH of waste liquid will be pre-processed in S3 with calcium oxide
It is adjusted to 10-12, polyacrylamide is then added, after the separation of the sediment in waste liquid will be pre-processed, can be obtained and meet discharge
The water of standard.
Three, comparative example
Comparative example 1: the dephosphorization agent of this comparative example is mixed by the ferrous sulfate that weight ratio is 3:10 with hydrogen peroxide, wherein dioxygen
The mass fraction of water is 30%.
Comparative example 2: the dephosphorization agent of this comparative example is mixed by the ferrous sulfate that weight ratio is 1:1 with hydrogen peroxide, wherein
The mass fraction of hydrogen peroxide is 30%.
Comparative example 3: the phosphorus catalyst that removes that it is 3:10 that the dephosphorization agent of this comparative example, which is by weight ratio, is mixed with hydrogen peroxide,
Wherein the mass fraction of hydrogen peroxide is 30%, except phosphorus catalyst is by ferrous sulfate 80kg, manganese dioxide 5kg and waste and old semiconductor
Powder (being selected from preparation example 1) 5kg, which is uniformly mixed, to be made.
Comparative example 4: this comparative example difference from example 1 is that, the dephosphorization agent of this comparative example is to be by weight ratio
The phosphorus catalyst that removes of 3:10 is mixed with hydrogen peroxide, and wherein the mass fraction of hydrogen peroxide is 30%, except phosphorus catalyst is by sulfuric acid
Ferrous 40kg, activity powdered carbon 40kg and waste and old semiconductor powder (being selected from preparation example 1) 5kg are uniformly mixed and are made.
Comparative example 5: this comparative example difference from example 1 is that, the dephosphorization agent of this comparative example is to be by weight ratio
The phosphorus catalyst that removes of 3:10 is mixed with hydrogen peroxide, and wherein the mass fraction of hydrogen peroxide is 30%, except phosphorus catalyst is by sulfuric acid
Ferrous 40kg, activity powdered carbon 40kg and manganese dioxide 5kg, which are uniformly mixed, to be made.
Comparative example 6: this comparative example and embodiment 7 the difference is that, dephosphorization agent is selected from dephosphorization prepared by comparative example 1
Agent.
Comparative example 7: this comparative example and embodiment 7 the difference is that, dephosphorization agent is selected from dephosphorization prepared by comparative example 2
Agent.
Comparative example 8: this comparative example and embodiment 7 the difference is that, dephosphorization agent is selected from dephosphorization prepared by comparative example 3
Agent.
Comparative example 9: this comparative example and embodiment 7 the difference is that, dephosphorization agent is selected from dephosphorization prepared by comparative example 4
Agent.
Comparative example 10: this comparative example and embodiment 7 the difference is that, dephosphorization agent is selected from dephosphorization prepared by comparative example 5
Agent.
Four, performance detection
Chemical nickle-plating wastewater of the waste water as experiment generated using certain factory's chemical nickel plating is mainly wrapped in the chemical nickle-plating wastewater
Sulfur acid nickel, sodium hypophosphite, sodium phosphite and acetic acid etc., using the method for embodiment 7-9 and comparative example 6-10 to same
The chemical nickle-plating wastewater of batch is tested, and the total amount of chemical nickle-plating wastewater used in every group of experiment is 1 ton, launched hydrogen peroxide
Weight be 1kg, the value of total phosphorus content and COD (COD) before and after test experiments in chemical nickle-plating wastewater will be tied
Fruit is shown in table 1.
Table 1 passes through the water quality parameter table of embodiment 7-9 and comparative example 6-10
The dephosphorization agent of the present invention (embodiment 7-9) preparation is applied to the processing of chemical nickle-plating wastewater it can be seen from 1 data of table
On, the hypophosphites and phosphite in waste water can be effectively removed, reduces total phosphorus content, and waste water can also be reduced
In total nickel and COD value, have the function of excellent phosphor-removing effect and reduce COD value.Compared to embodiment 7 and implement
Example 10 can further decrease COD value and sludge quantity as can be seen that polyacrylamide is added when treating wastewater.
The dephosphorization agent of comparative example 6 is selected from dephosphorization agent prepared by comparative example 1, and the dephosphorization agent is sub- by the sulfuric acid that weight ratio is 3:10
Iron is mixed with hydrogen peroxide, hypophosphites, phosphite, total in the water quality that handles by comparative example 6 compared to embodiment 7
Phosphorus, total nickel and COD value obviously increase, and illustrating that the phosphor-removing effect of dephosphorization agent of the invention is substantially better than by weight ratio is 3:10's
The phosphor-removing effect for the dephosphorization agent that ferrous sulfate and hydrogen peroxide mix.
The dephosphorization agent of comparative example 7 is selected from dephosphorization agent prepared by comparative example 2, and the dephosphorization agent is sub- by the sulfuric acid that weight ratio is 1:1
Iron is mixed with hydrogen peroxide, hypophosphites, phosphite, total in the water quality that handles by comparative example 7 compared to embodiment 7
Phosphorus, total nickel, COD value and sludge quantity obviously increase, and illustrate that the phosphor-removing effect of dephosphorization agent of the invention is substantially better than by weight ratio
For the phosphor-removing effect for the dephosphorization agent that the ferrous sulfate and hydrogen peroxide of 1:1 mix；Equivalent in the case where handling same total phosphorus concentration
When waste water, the dosage in embodiment 7 except phosphorus catalyst is only 30% of ferrous sulfate dosage in comparative example 7, what reaction generated
Sludge quantity is only 20% or so that common Fenton reagent generates sludge quantity, can reduce production cost and improve working efficiency.
Compared to comparative example 7, the value of hypophosphites, phosphite and total phosphorus is substantially reduced, and illustrates to increase with the dosage of ferrous sulfate
Add, the treatment effect of dephosphorization agent also improves therewith.
The dephosphorization agent of comparative example 8 is selected from dephosphorization agent prepared by comparative example 3, which is the dephosphorization for being 3:10 by weight ratio
Catalyst is mixed with hydrogen peroxide, wherein except active powdered carbon is not included in phosphorus catalyst, compared to embodiment 7, by comparison
In the water quality of the processing of example 8, hypophosphites, phosphite, total phosphorus, total nickel, COD value and sludge quantity are obviously increased, and illustrate dephosphorization
After adding active powdered carbon in catalyst, phosphor-removing effect can be significantly improved and the sludge quantity of generation can be reduced.
The dephosphorization agent of comparative example 9 is selected from dephosphorization agent prepared by comparative example 4, which is the dephosphorization for being 3:10 by weight ratio
Catalyst is mixed with hydrogen peroxide, wherein except manganese dioxide is not included in phosphorus catalyst, compared to embodiment 7, by comparison
In the water quality of the processing of example 9, hypophosphites, phosphite and total phosphorus are obviously increased, and are illustrated to remove in phosphorus catalyst and are added titanium dioxide
After manganese, phosphor-removing effect can be significantly improved.
The dephosphorization agent of comparative example 10 is selected from dephosphorization agent prepared by comparative example 5, and it is removing for 3:10 which, which is by weight ratio,
Phosphorus catalyst is mixed with hydrogen peroxide, wherein except waste and old semiconductor powder is not included in phosphorus catalyst, compared to embodiment 7,
In the water quality handled by comparative example 10, hypophosphites, phosphite, total phosphorus and sludge quantity are obviously increased, and illustrate that dephosphorization is urged
After adding waste and old semiconductor powder in agent, phosphor-removing effect can be significantly improved and reduce the sludge quantity of generation.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. a kind of remove phosphorus catalyst for chemical nickle-plating wastewater, it is characterised in that: based on parts by weight, mixed by following component
It forms: 40-50 parts of ferrous sulfate, active 40-50 parts of powdered carbon, 5-10 parts of manganese dioxide and semiconductor powder 5-10 parts waste and old.
2. it is according to claim 1 it is a kind of for chemical nickle-plating wastewater remove phosphorus catalyst, it is characterised in that: it is described waste and old
Semiconductor powder is one of semiconductor containing gallium, germanium semiconductor or theirs is compound.
3. it is according to claim 2 it is a kind of for chemical nickle-plating wastewater remove phosphorus catalyst, it is characterised in that: it is described contain gallium
Semiconductor is gallium nitride semiconductor.
4. it is according to claim 2 it is a kind of for chemical nickle-plating wastewater remove phosphorus catalyst, it is characterised in that: it is described waste and old
The partial size of semiconductor powder is 30-200 μm.
5. it is according to claim 4 it is a kind of for chemical nickle-plating wastewater remove phosphorus catalyst, it is characterised in that: it is described waste and old
Semiconductor powder is prepared with the following method: being taken waste and old semiconductor containing gallium or/and waste and old germanium semiconductor, is passed it through crushing, grinds
After mill and sieving, the waste and old semiconductor powder that partial size is 30-200 μm is obtained.
6. it is according to claim 1 it is a kind of for chemical nickle-plating wastewater remove phosphorus catalyst, it is characterised in that: the activity
The partial size of powdered carbon is 100-400 μm.
7. it is a kind of comprising remove phosphorus catalyst dephosphorization agent, it is characterised in that: by weight ratio be (3-5): 10 except phosphorus catalyst with
Hydrogen peroxide mixes.
8. a kind of dephosphorization agent comprising removing phosphorus catalyst according to claim 7, it is characterised in that: the matter of the hydrogen peroxide
Measuring score is 30%.
9. a kind of application method of dephosphorization agent, characterized by the following steps:
S1: its pH value is adjusted to 3-5 with acid by chemical nickle-plating wastewater to be processed；
S2: being added dephosphorization agent in the chemical nickle-plating wastewater after adjusting pH into S1, stir 1-2h, obtains pretreatment waste liquid；
S3: being adjusted to 10-12 for the pH for pre-processing waste liquid with calcium oxide, flocculant be then added, heavy in waste liquid by pre-processing
After starch separation, the water for meeting discharge standard can be obtained.
10. a kind of application method of dephosphorization agent according to claim 9, it is characterised in that: the flocculant is polypropylene
Amide.
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