CN103304015A

CN103304015A - PAC-PDMDAAC composite polymer coagulant for water treatment and preparation method thereof

Info

Publication number: CN103304015A
Application number: CN2013101867404A
Authority: CN
Inventors: 秦小林
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-05-20
Filing date: 2013-05-20
Publication date: 2013-09-18

Abstract

The invention provides a commercial PAC-PDMDAAC composite polymer coagulant for water treatment and a preparation method thereof. The coagulant is a solid and an inorganic-organic polymeric flocculant complex product, and has special functions of two compounds as well as a synergistic effect. The composite coagulant is prepared through the following steps of proportioning materials, mixing and grinding with PAC (polyaluminium chloride) as the main raw material and by adding less PDMDAAC, and the finished product is a powdery solid. The commercial PAC-PDMDAAC composite polymer coagulant for water treatment is convenient in transportation, storage and use, is suitable for treatment of industrial source water, tap water and industrial and domestic waste water, and has the characteristics of high efficiency, economical efficiency and the like.

Description

Water treatment PAC-PDMDAAC composite macromolecule coagulant and preparation method

Technical field

The present invention relates to a kind of inorganic and organic polymer coagulant double crossing product, preparation method and in the application of water treatment field, relate in particular to commercial grade PAC-PDMDAAC(poly aluminium chloride-Poly Dimethyl Diallyl Ammonium Chloride) complex coagulation medicament, preparation method and in the application of water treatment field.

Background technology

The homopolymer of alkyl diallyl ammonium chloride or multipolymer are the water-soluble organic macromolecule materials with property, are a kind of good cationic coagulating agent, form industrialization abroad already.Since on its macromolecular chain with the positive charge density height, good water solubility, molecular weight is moderate, has coagulation and the dual performance of sterilization, obtains practical application as the non-toxic cation coagulating agent at tap water already abroad.Domestic expensive because of it in recent years, use still seldom, and China uses more inorganic polymer coagulant poly aluminium chloride and has formed distinct Chinese characteristics.

Inorganic-organic complex coagulating agent both at home and abroad still is in conceptual phase, and mostly is composite dose of liquid greatly at present, does not also have industrialized efficient, cheap and transportation, stores easily composite dose of solid.

Summary of the invention

The purpose of this invention is to provide a kind of efficient, cheap novel built high-molecular coagulant adopting, for the treatment of industrial water source, tap water and industry and sanitary sewage etc., provide the compound method of this coagulating agent simultaneously.

For solving the problems of the technologies described above, adopt following technical scheme to realize,

A kind of water treatment PAC-PDMDAAC composite macromolecule coagulant is characterized in that: described composite macromolecule coagulant is that homopolymer or the multipolymer by poly aluminium chloride, alkyl diallyl ammonium chloride constitutes.

The mass ratio of the homopolymer of described poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:1～5.

Preferably, the mass ratio of the homopolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:3.

The homopolymer of described alkyl diallyl ammonium chloride is one or both mixing in Poly Dimethyl Diallyl Ammonium Chloride and the poly-diethyl diallyl ammonium chloride.

The mass ratio of the multipolymer of described poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:1～5.

Preferably, the mass ratio of the multipolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:3.

To be dimethyl diallyl ammonium chloride mix with one or both of the multipolymer of the multipolymer of acrylamide and diethyl diallyl ammonium chloride and acrylamide the multipolymer of described alkyl diallyl ammonium chloride.

A kind of water treatment comprises the steps: with the compound method of PAC-PDMDAAC composite macromolecule coagulant

A. with homopolymer or the copolymer p DMDAAC(Poly Dimethyl Diallyl Ammonium Chloride of alkyl diallyl ammonium chloride) water is configured to 20～30% mass concentration at normal temperatures;

B. with material and Powdered poly aluminium chloride in a) step, add in proportion in the defibrination pulverizing mill, at normal temperatures and pressures, after mixing with 1400 rev/mins speed, form 60～100 order pulverulent solids.

Preferably, the mass concentration after the described poly aluminium chloride dilution is 26%.

The invention has the advantages that: the inorganic polymer coagulant poly aluminium chloride is water-soluble can to produce the aluminium hydroxide structure flco with powerful positive charge, in and electronegative particle in the waste water; The homopolymer of organic polymer coargulator alkyl diallyl ammonium chloride and with the multipolymer of acrylamide, soluble in water, structure is huge, and particle tool net in the water is caught effect, and the tool disinfection.Composite product can be given full play to both synergies, not only can reduce the consumption of inorganic polymer coagulant significantly, can also reduce the COD value of former water, and reduces sludge quantity.

Embodiment

Be further elaborated explanation below in conjunction with the present invention of embodiment.

Embodiment 1

Certain paper mill comprehensive wastewater, undressed water quality is: COD=5250mg/L, SS=2050mg/L, 1200 times of colourities, PH6.5, normal temperature.Add 30mg/L composite mixing high-molecular coagulant adopting of the present invention, through twice mixing, 500 rev/mins for the first time, mixed 1 minute, 300 rev/mins speed was mixed 5 minutes for the second time, precipitated 15 minutes then.

The mass ratio of the homopolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:3 in the composite mixing high-molecular coagulant adopting, and preparation technology is as follows:

A), at first will be configured to 26% mass concentration under the homopolymer of alkyl diallyl ammonium chloride or the copolymer p DMDAAC water normal temperature;

B), with material and poly aluminium chloride in a) step, add simultaneously in proportion in the defibrination pulverizing mill, at normal temperatures and pressures, after mixing with 1400 rev/mins speed, form 60～100 purpose powdery products.

Handling back water quality becomes: COD=410mg/L, and clearance reaches 92.2%; 120 times of colourities, clearance reaches 90%; SS=12mg/L, clearance reaches 99.4%; PH6.4.Water quality is limpid behind coagulating sedimentation.

Embodiment 2

Limit, the Changjiang river water source factory: about 1000,500, the 100NTU of raw water turbidity, 7.15,22 ℃ of PH, composite mixing high-molecular coagulant adopting dosage are respectively 20,10,5mg/L, and water turbidity sees Table 1 all less than 3.0NTU behind the coagulating sedimentation.

Table 1 adds the usefulness that water is handled in the compounding coagulation agent

Figure 2013101867404100002DEST_PATH_IMAGE001

Embodiment 3

Composite high-molecular coagulant adopting is that the mass ratio of the multipolymer of poly aluminium chloride and alkyl diallyl ammonium chloride and acrylamide is 1000: 3 in the present embodiment, and preparation technology is with embodiment 1.

Adopt waste water, the handling procedure identical with embodiment 1, when composite multipolymer coagulant charging quantity was 30mg/L, handling afterwards, water quality was:: COD is 421mg/L, and clearance is 92.0 %; 128 times of colourities, clearance 89.3%; SS is 10mg/L, clearance 99.5%; PH6.4.Water quality is limpid behind the coagulating sedimentation.

Embodiment 4

With the former water (turbidity 500.7NTU, 7.15,22 ℃ of PH) of the Changjiang river water factory among the embodiment 2, handle with the compounding coagulation agent of different composite amounts, the equal 10mg/L of dosage adopts following handling procedure: 500 rev/mins for the first time, mixed 1 minute; 300 rev/mins for the second time, mixed 5 minutes; Precipitate 15 minutes then.Result sees Table 2;

Table 2 adds the usefulness of dissimilar compound coagulants, different composite dosage processing water

As can be seen from the table, press poly aluminium chloride: alkyl diallyl ammonium chloride homopolymer=1000: the compound coagulant that (1～5) is composite all can make residual turbidity reach requirement.The composite dosage of organic floculant surpasses 3 ‰, and residual turbidity reduces not obvious, and composite cost significantly increases, and is the best with composite dosage 3 ‰ then.

Press poly aluminium chloride: alkyl diallyl ammonium chloride/acrylamide copolymer=1000: the compound coagulant that (1～5) is composite all can make residual turbidity reach requirement.The composite dosage of organic floculant surpasses 3 ‰, and residual turbidity reduces not obvious, and composite cost obviously increases, and is the best with composite dosage 3 ‰.

Embodiment 5

In compound process, PDMDAAC homopolymer or multipolymer need dilute earlier, and weaker concn directly influences the coagulation performance of product.The weaker concn height, moisture increases, and the inorganic polymer coagulant amount reduces, and usefulness reduces; Weaker concn is low, PDMDAAC homopolymer or multipolymer skewness in inorganic polymer coagulant, and usefulness reduces; Weaker concn the best with 26%.

Be example with the Changjiang river Yuan Shui (turbidity 98.5NTU, 7.15,22 ℃ of PH), all add compound coagulant 5mg/L, press the follow procedure coagulation: 500 rev/mins for the first time, mixed 1 minute; 300 rev/mins for the second time, mixed 5 minutes; Precipitate 15 minutes.

The compound coagulant that table 3 is prepared with different weaker concns, the usefulness of processing water

The compound coagulant of different concns (%) preparation	20	22	24	26	28	30
							Residual turbidity (NTU)	4.5	3.2	2.7	1.6	2.5	3.6

As can be known, the control weaker concn is handled the water residual turbidity and all is lower than 5NTU 20%～30% from table, but is the best with 26% weaker concn.

Above-described embodiment is only in order to technical scheme of the present invention to be described but not design of the present invention and protection domain are limited; those of ordinary skill of the present invention is made amendment to technical scheme of the present invention or is equal to replacement; and not breaking away from aim and the scope of technical scheme, it all should be encompassed in the claim scope of the present invention.

Claims

1. water treatment PAC-PDMDAAC composite macromolecule coagulant is characterized in that: described composite macromolecule coagulant is that homopolymer or the multipolymer by poly aluminium chloride, alkyl diallyl ammonium chloride constitutes.

2. a kind of water treatment PAC-PDMDAAC composite macromolecule coagulant according to claim 1, it is characterized in that: the mass ratio of the homopolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:1～5.

3. a kind of water treatment PAC-PDMDAAC composite macromolecule coagulant according to claim 2, it is characterized in that: the mass ratio of the homopolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:3.

4. a kind of water treatment PAC-PDMDAAC composite macromolecule coagulant according to claim 1, it is characterized in that: the homopolymer of described alkyl diallyl ammonium chloride is one or both mixing in Poly Dimethyl Diallyl Ammonium Chloride and the poly-diethyl diallyl ammonium chloride.

5. a kind of water treatment PAC-PDMDAAC composite macromolecule coagulant according to claim 1, it is characterized in that: the mass ratio of the multipolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:1～5.

6. a kind of water treatment PAC-PDMDAAC composite macromolecule coagulant according to claim 5, it is characterized in that: the mass ratio of the multipolymer of poly aluminium chloride and alkyl diallyl ammonium chloride is 1000:3.

7. a kind of water treatment PAC-PDMDAAC composite macromolecule coagulant according to claim 1 is characterized in that: to be dimethyl diallyl ammonium chloride mix with one or both of the multipolymer of the multipolymer of acrylamide and diethyl diallyl ammonium chloride and acrylamide the multipolymer of described alkyl diallyl ammonium chloride.

8. a water treatment PAC-PDMDAAC composite macromolecule coagulant is characterized in that: comprise the steps:

A. homopolymer or the copolymer p DMDAAC water with the alkyl diallyl ammonium chloride is configured to 20～30% mass concentration at normal temperatures;

9. a kind of compound method of handling the composite macromolecule coagulant of tap water, industrial source water and city domestic sewage according to claim 8 is characterized in that: the mass concentration after the described poly aluminium chloride dilution is 26%.