CN107963709A - A kind of high-efficiency sewage dephosphorization agent and its application in municipal wastewater advanced treating - Google Patents

A kind of high-efficiency sewage dephosphorization agent and its application in municipal wastewater advanced treating Download PDF

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Publication number
CN107963709A
CN107963709A CN201711394872.0A CN201711394872A CN107963709A CN 107963709 A CN107963709 A CN 107963709A CN 201711394872 A CN201711394872 A CN 201711394872A CN 107963709 A CN107963709 A CN 107963709A
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China
Prior art keywords
dephosphorization agent
phosphate
sewage dephosphorization
ferric sulfate
efficiency sewage
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Pending
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CN201711394872.0A
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Chinese (zh)
Inventor
李璐
赵黄浦
李�杰
袁霄
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Shanghai Wan Lion Environmental Protection & Technology Co Ltd
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Shanghai Wan Lion Environmental Protection & Technology Co Ltd
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Priority to CN201711394872.0A priority Critical patent/CN107963709A/en
Publication of CN107963709A publication Critical patent/CN107963709A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56Macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds

Abstract

The invention discloses a kind of efficient dephosphorization agent and its application in municipal wastewater advanced treating, the efficient dephosphorization agent includes bodied ferric sulfate, the active ingredient such as phosphate and high polymer coagulant, the mass ratio of bodied ferric sulfate is 75% 85%, phosphate mass ratio is 1% 10%, and flocculant mass ratio is 0.5% 10%;Application method staticly settles, water outlet can meet for efficient dephosphorization agent is added in biochemistry pool water outlet after mechanical agitation or hydraulic mixing《Urban wastewater treatment firm pollutant emission standard》(GB18918‑2002)Level-one A standards, good phosphor-removing effect is respectively provided with to the sanitary sewage of various concentrations.

Description

A kind of high-efficiency sewage dephosphorization agent and its application in municipal wastewater advanced treating
Technical field
The invention belongs to sewage treatment field, more particularly to a kind of high-efficiency sewage dephosphorization agent and its in municipal wastewater depth Application in reason.
Background technology
Nutrient necessary to phosphorus is water plant length, can promote the normal growth of water plant, maintain water body life State balances, but phosphorus excessively easily leads to body eutrophication and water quality deterioration;Since China's municipal sewage amount increases year by year, 80% Rivers and lakes be subjected to different degrees of pollution.
Urban wastewater treatment firm is the main carrier for implementing water pollutant emission reduction targets.In order to further control pollutant Discharge, country will《Urban wastewater treatment firm contaminates thing discharge standard》(GB18918-2002)In primary standard progress be refined as A, B two-stages, major river valley, the urban wastewater treatment firm in region need to reach country《Urban wastewater treatment firm contaminates thing discharge standard》 Level-one A or higher discharge standard(Total nitrogen≤15mg/L, total phosphorus≤0.5mg/L).Increasingly stringent discharge standard certainly will be to dirt The denitrogenation dephosphorizing of water treatment plant proposes the technical requirements of higher.
The removal of phosphorus mainly has chemical method, activated sludge process, aquatile fixation, physisorphtion, embrane method and soil Method of purification etc., wherein, chemical precipitation method and microbial method are more common.In recent years, stepping up due to water standard, merely The stably reaching standard of water outlet phosphorus concentration is difficult to realize by biology aerobic suction phosphorus, the mass concentration of water outlet total phosphorus is in 1~2mg/L Between, it is difficult to reach discharge standard.And chemical coagulation and precipitation then has the advantages that cost is low, easy to operate, stability is good, can use Make the advanced treating of town sewage plant, further dephosphorization.
At present, the more extensive dephosphorization agent of application has FeCl3、Al2(SO4)3, aluminium polychloride(PAC), bodied ferric sulfate (PFS)Etc. aluminium salt and iron salt coagulant.These conventional dephosphorization agent effects are unstable, and dosage is larger, and cost is higher.
The content of the invention
The purpose of the present invention will solve above-mentioned technical problem, there is provided a kind of answering dedicated for coking wastewater deep treatment Medicament is closed, the content of total phosphorus in municipal wastewater can be significantly reduced, achievees the purpose that deep phosphorous removal, ensures that processing water water quality reaches 《Coking chemistry emission of industrial pollutants standard(GB16171-2012)》Requirements.
The object of the present invention is achieved like this:A kind of high-efficiency sewage dephosphorization agent, it is characterised in that:The sewage dephosphorization Agent is made of bodied ferric sulfate, phosphate, flocculant, by weight percentage:
Bodied ferric sulfate 75%~85%,
Phosphate 1%~15%,
Flocculant 0.5%~10%.
The content of full iron is 18.5%~25% in the bodied ferric sulfate, basicity for 9.0~14.0%, pH 2.0~ 3.0。
The phosphate is sodium phosphate, in potassium dihydrogen phosphate, sodium dihydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate It is one or more.
The flocculant is by cationic polyacrylamide(Molecular weight is 5,000,000~10,000,000, cationic degree 25~30%)And polydimethyl diallyl ammonium chloride(Molecular weight is 500,000~800,000)Mix, mass ratio is: Cationic polyacrylamide accounts for 5%~85%, and polydimethyl diallyl ammonium chloride accounts for 15%~95%.
A kind of preparation method of high-efficiency sewage dephosphorization agent, it is characterised in that:Including following operating procedure:
A), bodied ferric sulfate and sewage dephosphorization agent reacted to obtain component A;
B), polyacrylamide is configured to solution, add polydimethyl diallyl ammonium chloride, stir evenly, obtain component B;
C), component A and component B compounded to obtain product.
Preferably, in composite flocculation agent solution, the content of polyacrylamide is 0.1%~1%.
Preferably, in composite flocculation agent solution, the content of polydimethyl diallyl ammonium chloride is 0.2%~2%.
A kind of application of high-efficiency sewage dephosphorization agent in municipal wastewater advanced treating, it is characterised in that:Including following operation Step:
A), prepared dephosphorization agent is diluted with water to the aqueous solution that mass concentration is 1%~20%;
B), above-mentioned solution is added in the phosphorus-containing wastewater of biochemical treatment tank water outlet;
C), after mechanical agitation or hydraulic mixing, staticly settle 15min.
Inventive formulation is reasonable, and mixing compounding, preparation side are carried out using bodied ferric sulfate, phosphate, high polymer coagulant Just, using the synergistic effect of compound drug, biochemistry pool water outlet total phosphorus content is 0.5mg/L~10mg/L, after advanced treating The content of total phosphorus in sewage can be substantially reduced, is reached《Urban wastewater treatment firm pollutant emission standard》(GB18918- 2002)Level-one A standards;Dosage and processing cost are significantly reduced, technological transformation scale of investment is small, and promoting and applying has well Economic and social benefit.
Brief description of the drawings
Fig. 1 is one efficient dephosphorization agent of the embodiment of the present invention and ferric trichloride phosphor-removing effect contrast table.
Fig. 2 is two efficient dephosphorization agent of the embodiment of the present invention and ferric trichloride phosphor-removing effect contrast table.
Fig. 3 is three efficient dephosphorization agent of the embodiment of the present invention and ferric trichloride phosphor-removing effect contrast table.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings, but not as limitation of the present invention:
A kind of high-efficiency sewage dephosphorization agent, the sewage dephosphorization agent are made of bodied ferric sulfate, phosphate, flocculant, by weight Percentages:
Bodied ferric sulfate 75%~85%,
Phosphate 1%~15%,
Flocculant 0.5%~10%;
The content of full iron is 18.5%~25% in the bodied ferric sulfate, and basicity is 9.0~14.0%, pH 2.0~3.0;
The phosphate is sodium phosphate, one kind in potassium dihydrogen phosphate, sodium dihydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate It is or a variety of;
The flocculant is by cationic polyacrylamide(Molecular weight is 5,000,000~10,000,000, cationic degree 25 ~30%)And polydimethyl diallyl ammonium chloride(Molecular weight is 500,000~800,000)Mix, mass ratio is:Sun Cationic polyacrylamide accounts for 5%~85%, and polydimethyl diallyl ammonium chloride accounts for 15%~95%.
A kind of preparation method of high-efficiency sewage dephosphorization agent, including following operating procedure:
A), bodied ferric sulfate and sewage dephosphorization agent reacted to obtain component A;
B), polyacrylamide is configured to solution, add polydimethyl diallyl ammonium chloride, stir evenly, obtain component B;
C), component A and component B compounded to obtain product.
Preferably, in component B, the content of polyacrylamide is 0.1%~1%.
Preferably, in component B, the content of polydimethyl diallyl ammonium chloride is 0.2%~2%.
A kind of application of high-efficiency sewage dephosphorization agent in municipal wastewater advanced treating, including following operating procedure:
A), prepared dephosphorization agent is diluted with water to the aqueous solution that mass concentration is 1%~20%;
B), above-mentioned solution is added in the phosphorus-containing wastewater of biochemical treatment tank water outlet;
C), after mechanical agitation or hydraulic mixing, staticly settle 15min.
When it is implemented, phosphate radical can participate in Fe3+Hydrolysis and polymerisation, unbodied Fe(OH)3It can adsorb Phosphate radical and reduce the volume of solution, formed bridged bond;By adding phosphorus, on the one hand can improve the unstability of its performance with And the effect of processing waste water;On the other hand the degree of polymerization of bodied ferric sulfate can be increased, be conducive to improve the mixed of bodied ferric sulfate Solidifying performance.
Patent of the present invention uses polyacrylamide and polydimethyl diallyl ammonium chloride compounding use, poly dimethyl diene Propyl ammonium chloride is a kind of cationic polymer, and for molecular weight between hundreds of thousands, viscosity is less than polyacrylamide.Utilize poly- diformazan The charge and polymer molecular structure of base diallyl ammonium chloride, can partly substitute the use of polyacrylamide.Also, Found in research, the flocculating effect of polyacrylamide compounding polydimethyl diallyl ammonium chloride solution adds two kinds better than substep Medicament, the reason is that there are cooperative effect between the two.
The composite dephosphorizing agent raw material of the present invention is simple and easy to get, easy to use, can effectively handle the phosphorous useless of various concentrations Water, the content of total phosphorus reaches below 0.5ppm in water outlet, and total phosphorus goes dechlorination to reach more than 80% in middle low concentration, also may be used Applied to agricultural chemicals waste water, paper waste, dyeing waste water even depth dephosphorization process.
Embodiment one, handle high-concentration phosphorus-containing wastewater using efficient dephosphorization agent and ferric trichloride respectively,
Step:By efficient dephosphorization agent and ferric trichloride (density 1.55g/cm3) two kinds of medicaments are formulated as the weak solution of 1000mg/L; Take each 1L of sewage of the first sewage treatment plant of Jinan City biological tank, respectively dosage 10,20,30,40,50, two kinds of 70mg/L Sample;2min is stirred soon, stirs 2min slowly, stands 15min, takes supernatant to survey the content of total phosphorus, as a result as shown in Figure 1,
As adding of agent 10ppm, the total phosphorus of secondary clarifier effluent can be reduced to 0.89mg/L respectively by efficient dephosphorization agent, processing Significant effect, with the increase of efficient dephosphorization agent dosage, the content of total phosphorus is decreased obviously in water, when added amount of chemical is 50- During 70ppm, water outlet total phosphorus meets《Urban wastewater treatment firm pollutant emission standard》(GB18918-2002)Level-one A standards.Three The content of total phosphorus is 1.06mg/L in water when the dosage of iron chloride is 70mg/L, still not up to standard.
According to experimental study, under conditions of biological tank treatment effect is poor(Biological tank water outlet total phosphorus content is high), In order to reach the water outlet TP of sewage treatment plant《Urban wastewater treatment firm pollutant emission standard》(GB18918-2002)Level-one Emission standard A, it is 50mg/L that the Novel dephosphorization agent under sewage plant stable operation, which adds concentration, its price is 350 yuan/t, processing 1 Ton waste water medicament expense is 0.0175 yuan;Compared to ferric trichloride, the medicament of 70mg/L is equally added(Under conditions of the dosage It is still below standard), its price is 360 yuan/t, and it is 0.0252 yuan to handle 1 ton of waste water medicament expense, comparatively speaking, the minimum energy of cost 31% is enough saved, and treatment effect is better than ferric trichloride.
Embodiment two, handle high-concentration phosphorus-containing wastewater using efficient dephosphorization agent and ferric trichloride respectively,
Step:By efficient dephosphorization agent and ferric trichloride(Density 1.55g/cm3)Two kinds of medicaments are formulated as the weak solution of 1000mg/L; Each 1L of sewage of biological tank is taken, respectively dosage 10,40,60, the 1 of 80mg/L, No. 2 samples;2min is stirred soon, stirs 2min slowly, it is quiet 15min is put, takes supernatant to survey the content of total phosphorus, as a result as shown in Figure 2,
When handling the total phosphorus of low concentration sewage, efficient dephosphorization agent just can be reduced substantially in water when dosage is 10mg/L Total phosphorus content, be reduced to 0.24mg/L respectively, water outlet TP reaches《Urban wastewater treatment firm pollutant emission standard》 (GB18918-2002)Level-one emission standard A.
For the dosage of ferric trichloride in 40mg/L, the content of total phosphorus is below standard in 0.53mg/L;Dosage is 60mg/L When, the content of total phosphorus is 0.39mg/L, up to standard.
According to experimental study, in the case of biological tank phosphor-removing effect is preferable(Biological tank water outlet total phosphorus content compared with It is low), in order to reach the water outlet TP of sewage treatment plant《Urban wastewater treatment firm pollutant emission standard》(GB18918-2002) Level-one emission standard A, it is 10mg/L that the efficient dephosphorization agent under sewage plant stable operation, which adds concentration, its price is 350 yuan/t, place 1 ton of waste water medicament expense of reason is 0.0035 yuan;Compared to ferric trichloride, the medicament of 60mg/L is equally added, its price is 360 Member/t, it is 0.0216 yuan to handle 1 ton of waste water medicament expense, and cost can reduce by 83.8%, illustrate efficient dephosphorization agent to low concentration Phosphorus-containing wastewater has processing advantage, is suitable for the advanced treating of phosphorus-containing wastewater.
Embodiment three, efficient dephosphorization agent and commercially available medicament(Production firm:Xi'an medicament business)Contrast,
Step:Efficient dephosphorization agent and commercially available two kinds of medicaments of medicament are formulated as to the weak solution of 1000mg/L;Take the sewage of biological tank Each 1L, difference dosage 50,70, the 1 of 90mg/L, No. 2 samples;2min is stirred soon, stirs 2min slowly, is stood 15min, is taken supernatant to survey The content of total phosphorus, as a result as shown in Figure 3,
Efficient dephosphorization agent is added in waste water, can reach stable phosphor-removing effect, when dosage 50,70,90mg/L, phosphorus Removal effect is held essentially constant, and maintains 0.12-0.13mg/L, is met《Urban wastewater treatment firm pollutant emission standard》 (GB18918-2002)Level-one A standards, stable effluent quality;
Comparatively speaking, commercially available medicament is to the total phosphorus removal effect unobvious in biological tank water outlet, when dosage is 60ppm, The content of total phosphorus is 0.40mg/L in sewage, which does not have that effect of the T101 dephosphorization agents when dosage is 50ppm is good, When added amount of chemical is 90ppm, the treatment effect of the medicament reaches optimal, and the content of total phosphorus is 0.19mg/L in sewage, but It is the increase with added amount of chemical, the content of total phosphorus has gradual increased trend, when dosage is 150mg/L, sewage again The content of middle total phosphorus is 0.39mg/L, illustrates the medicament when dosage is higher(> 60mg/L), the removal to total phosphorus in sewage Effect is not notable.By contrast test it may be speculated that efficient dephosphorization agent is substantially better than commercially available medicament to the treatment effect of sewage.
The above embodiment of the present invention, is only to clearly demonstrate examples of the invention, but is not limited to this hair Bright protection domain, all equivalent technical solutions fall within scope of the invention, and scope of patent protection of the invention should be by each Item claim limits.

Claims (6)

  1. A kind of 1. high-efficiency sewage dephosphorization agent, it is characterised in that:The sewage dephosphorization agent is by bodied ferric sulfate, phosphate, flocculation Agent forms, by weight percentage:
    Bodied ferric sulfate 75%~85%,
    Phosphate 1%~15%,
    Flocculant 0.5%~10%.
  2. A kind of 2. high-efficiency sewage dephosphorization agent according to claim 1, it is characterised in that:Full iron in the bodied ferric sulfate Content be 18.5%~25%, basicity for 9.0~14.0%, pH 2.0~3.0.
  3. A kind of 3. high-efficiency sewage dephosphorization agent according to claim 1, it is characterised in that:The phosphate for sodium phosphate, One or more in potassium dihydrogen phosphate, sodium dihydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate.
  4. A kind of 4. high-efficiency sewage dephosphorization agent according to claim 1, it is characterised in that:The flocculant is gathered by cation Acrylamide(Molecular weight is 5,000,000~10,000,000, cationic degree 25~30%)With poly dimethyl allyl chlorine Change ammonium(Molecular weight is 500,000~800,000)Mix, mass ratio is:Cationic polyacrylamide accounts for 5%~85%, gathers Dimethyl diallyl ammonium chloride accounts for 15%~95%.
  5. A kind of 5. preparation method of high-efficiency sewage dephosphorization agent, it is characterised in that:Including following operating procedure:
    A), bodied ferric sulfate and sewage dephosphorization agent reacted to obtain component A;
    B), polyacrylamide is configured to solution, add polydimethyl diallyl ammonium chloride, stir evenly, obtain component B;
    C), component A and component B compounded to obtain product.
  6. A kind of 6. application of high-efficiency sewage dephosphorization agent in municipal wastewater advanced treating, it is characterised in that:Including following operation step Suddenly:
    A), prepared dephosphorization agent is diluted with water to the aqueous solution that mass concentration is 1%~20%;
    B), above-mentioned solution is added in the phosphorus-containing wastewater of biochemical treatment tank water outlet;
    C), after mechanical agitation or hydraulic mixing, staticly settle 15min.
CN201711394872.0A 2017-12-21 2017-12-21 A kind of high-efficiency sewage dephosphorization agent and its application in municipal wastewater advanced treating Pending CN107963709A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110054267A (en) * 2019-03-21 2019-07-26 山东益源环保科技有限公司 A kind of high efficiency composition dephosphorization agent and its application method in municipal wastewater deep phosphorous removal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110054267A (en) * 2019-03-21 2019-07-26 山东益源环保科技有限公司 A kind of high efficiency composition dephosphorization agent and its application method in municipal wastewater deep phosphorous removal

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