CN113860456A - Flocculating agent and preparation method thereof - Google Patents
Flocculating agent and preparation method thereof Download PDFInfo
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- CN113860456A CN113860456A CN202111331866.7A CN202111331866A CN113860456A CN 113860456 A CN113860456 A CN 113860456A CN 202111331866 A CN202111331866 A CN 202111331866A CN 113860456 A CN113860456 A CN 113860456A
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- 238000002360 preparation method Methods 0.000 title claims description 9
- 239000008394 flocculating agent Substances 0.000 title abstract description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 62
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 52
- 239000011734 sodium Substances 0.000 claims abstract description 52
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 52
- 239000011787 zinc oxide Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 claims abstract description 29
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 description 34
- 238000004043 dyeing Methods 0.000 description 27
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000007787 solid Substances 0.000 description 7
- 238000005189 flocculation Methods 0.000 description 6
- 230000016615 flocculation Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 108010009736 Protein Hydrolysates Proteins 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- -1 assistant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/5245—Treatment 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
-
- 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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a flocculating agent, which comprises the following raw materials: 8-14 parts of poly dimethyl diallyl ammonium chloride, 18-28 parts of sodium metaaluminate, 3-10 parts of sodium humate, 13-22 parts of zinc oxide, 13-22 parts of calcium hypochlorite and 18-27 parts of water by weight.
Description
Technical Field
The invention relates to the printing and dyeing wastewater treatment industry, in particular to a flocculating agent and a preparation method thereof.
Background
Waste water discharged from cotton, hemp, chemical fiber and blended products thereof, and silk, printing and dyeing, wool dyeing and finishing, silk factories and the like. The types and the processing techniques of the fibers are different, and the water quantity and the water quality of the printing and dyeing wastewater are also different. Wherein the amount of the wastewater in the printing and dyeing mill is large, 100-200 t of water is consumed for every 1t of textile processed by printing and dyeing, and 80-90% of the wastewater is discharged. The printing and dyeing wastewater has the characteristics of large water quantity, high organic pollutant content, large alkalinity, large water quality change and the like, belongs to one of industrial wastewater difficult to treat, and contains dye, slurry, auxiliary agent, oil agent, acid and alkali, fiber impurities, sand substances, inorganic salt and the like.
The textile printing and dyeing industry has been developed greatly as the traditional characteristic industry of China. The waste water contains dye, slurry, assistant, oil solution, acid-base, fiber impurities, sand substances, inorganic salt and the like, and the waste water can cause great damage to the environment if directly discharged.
In the existing printing and dyeing wastewater treatment process, a coagulation and biochemical treatment process is generally adopted, but due to the development of chemical fiber fabrics, the rise of imitated silk and the improvement of printing and dyeing after-finishing technology in recent years, a large amount of organic matters which are difficult to degrade biochemically, such as polyvinyl alcohol slurry, rayon alkaline hydrolysate, novel auxiliary agents and the like, enter the printing and dyeing wastewater, so that the degradation capability of microorganisms on dyes is reduced, the tail end effluent chroma of the whole process is higher, the Chemical Oxygen Demand (COD) concentration is higher, and the national requirements are difficult to meet. Therefore, how to develop a decolorizing flocculant for printing and dyeing wastewater, which can significantly reduce COD and chroma with high efficiency, has become a research hotspot and difficulty for those skilled in the art.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a flocculating agent which has a good decolorizing effect, simultaneously gives consideration to the coagulating sedimentation performance of the traditional flocculating agent, and can effectively solve the problems of high effluent chroma and high chemical oxygen demand in wastewater treatment in the prior art.
The second purpose of the invention is to provide a preparation method of the flocculant, and the flocculant prepared by the preparation method has more target products, less impurities and less waste, and can achieve the best effect of cleaning waste water.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a flocculant comprising the following raw materials: 8-14 parts of poly dimethyl diallyl ammonium chloride, 18-28 parts of sodium metaaluminate, 3-10 parts of sodium humate, 13-22 parts of zinc oxide, 13-22 parts of calcium hypochlorite and 18-27 parts of water by weight.
Preferably, the flocculant comprises the following raw materials: 10-12 parts of poly dimethyl diallyl ammonium chloride, 20-26 parts of sodium metaaluminate, 5-8 parts of sodium humate, 15-20 parts of zinc oxide, 15-20 parts of calcium hypochlorite and 20-25 parts of water.
Preferably, the flocculant comprises the following raw materials: 11 parts of poly dimethyl diallyl ammonium chloride, 24 parts of sodium metaaluminate, 8 parts of sodium humate, 18 parts of zinc oxide, 18 parts of calcium hypochlorite and 21 parts of water.
The poly dimethyl diallyl ammonium chloride used in the invention is a novel cationic organic high molecular polymer, has good water solubility, plays a role of a flocculating agent in the product, and can lead colloid and fine suspended matters in the wastewater to be gathered into a large-volume flocculating constituent, thereby leading the impurities in the wastewater to be separated. Besides, the poly dimethyl diallyl ammonium chloride has quite strong electric neutralization function, wherein high molecular cation groups are attracted with negatively charged sludge ions to neutralize the surface charge of colloid particles, and meanwhile, a colloid diffusion layer is compressed to agglomerate particles, and the generation efficiency and the generation rate of flocculation precipitation are greatly enhanced by virtue of the bonding bridging function of high molecular chains.
In order to accelerate the speed of precipitation, the invention also adopts sodium humate which is nontoxic, free from enemy, free from corrosion, easy to dissolve in water and capable of being used for convergence, and can accelerate the precipitation of flocculation better and faster by matching with the poly dimethyl diallyl ammonium chloride.
Meanwhile, zinc oxide is added in the raw materials, and the zinc oxide is insoluble in water and soluble in strong base and acid, so that sodium metaaluminate is used in the raw materials, is easy to absorb moisture and is very easy to dissolve in water, the water is alkaline, and the condition for dissolving the zinc oxide can be just formed. The zinc oxide has larger energy band gap and exciton constraint energy and high transparency, and can be used as an adhesive to adhere the flocculation in the wastewater together, thereby facilitating the flocculation treatment in the wastewater treatment.
Finally, because the chroma in the waste water is relatively high and does not accord with the national waste water discharge standard, the invention adds calcium hypochlorite into the raw material, the calcium hypochlorite is an organic compound, has quick effect and bleaching effect, is used as the bleaching agent in the waste water treatment of the invention, and can play a certain role in sterilizing the waste water.
The raw materials are matched for use, so that the prepared flocculating agent not only can remove impurities in the wastewater, but also can remove the color of the wastewater, and can play a role in sterilizing the wastewater, thereby achieving multiple purposes and perfectly solving the problems in the prior art.
The invention also provides a preparation method of the flocculant, which comprises the following steps:
adding water and heating;
adding sodium metaaluminate and stirring;
adding polydimethyldiallyl ammonium chloride;
cooling, and adding sodium humate, zinc oxide and calcium hypochlorite;
heating and stirring, and cooling to room temperature.
Preferably, the temperature is heated to 70-80 ℃, preferably 75 ℃ after the addition of water.
Preferably, the stirring time for adding the sodium metaaluminate is 1-2h, and the stirring time is preferably 1.5 h.
Preferably, the addition of sodium humate, zinc oxide and calcium hypochlorite reduces the temperature to 35-40 ℃, preferably to 38 ℃.
Preferably, the stirring time for adding the sodium humate, the zinc oxide and the calcium hypochlorite is 2-4h, and the stirring time is 3 h.
Preferably, the temperature is raised to 45-55 ℃ after the addition of sodium humate, zinc oxide and calcium hypochlorite, preferably to 50 ℃.
Preferably, the time for controlling the temperature after the sodium humate, the zinc oxide and the calcium hypochlorite are added is 2-4 hours, and the temperature is controlled for 3 hours.
Compared with the prior art, the invention has the beneficial effects that:
the decolorizing flocculant for printing and dyeing wastewater provided by the invention can ensure that the total solid removal rate of the printing and dyeing wastewater is more than 85%, the chroma removal rate can reach 90%, and the COD removal rate can reach more than 80%, thereby remarkably improving the flocculation and decolorizing capacity of the decolorizing flocculant for printing and dyeing wastewater.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
The materials are prepared according to the following parts by mass: 11 parts of poly dimethyl diallyl ammonium chloride, 24 parts of sodium metaaluminate, 8 parts of sodium humate, 18 parts of zinc oxide, 18 parts of calcium hypochlorite and 21 parts of water. The flocculant is prepared according to the following steps:
1) placing 21 parts of water in a reaction kettle, and heating to 75 ℃;
2) adding 24 parts of sodium metaaluminate into the reaction kettle, and stirring for 1.5 hours;
3) keeping stirring, and slowly adding 11 parts of poly dimethyl diallyl ammonium chloride into a stirring kettle;
4) the temperature is reduced, the temperature is controlled to be 38 ℃, 8 parts of sodium humate, 18 parts of zinc oxide and 18 parts of calcium hypochlorite are added in turn while stirring.
5) Stirring for 3 hours, controlling the temperature at 50 ℃, and automatically cooling to normal temperature after 3 hours.
The flocculant prepared by the method is added into the printing and dyeing wastewater, so that the total solid removal rate of the printing and dyeing wastewater can reach 98%, the chroma removal rate can reach 98%, and the COD removal rate can reach 92%.
Example 2
Taking 8 parts of poly dimethyl diallyl ammonium chloride, 28 parts of sodium metaaluminate, 10 parts of sodium humate, 13 parts of zinc oxide, 13 parts of calcium hypochlorite and 27 parts of water. The flocculant is prepared according to the following steps:
1) placing 27 parts of water in a reaction kettle, and heating to 75 ℃;
2) adding 28 parts of sodium metaaluminate into the reaction kettle, and stirring for 1.5 hours;
3) keeping stirring, and slowly adding 8 parts of poly dimethyl diallyl ammonium chloride into a stirring kettle;
4) the temperature is reduced, the temperature is controlled at 38 ℃, and 10 parts of sodium humate, 13 parts of zinc oxide and 13 parts of calcium hypochlorite are added in turn while stirring.
5) Stirring for 3 hours, controlling the temperature at 50 ℃, and automatically cooling to normal temperature after 3 hours.
The flocculant prepared by the method is added into the printing and dyeing wastewater, so that the total solid removal rate of the printing and dyeing wastewater can reach 94%, the chroma removal rate can reach 96%, and the COD removal rate can reach 90%.
Example 3
Taking 14 parts of poly dimethyl diallyl ammonium chloride, 18 parts of sodium metaaluminate, 3 parts of sodium humate, 22 parts of zinc oxide, 22 parts of calcium hypochlorite and 18 parts of water. The flocculant is prepared according to the following steps:
1) putting 18 parts of water into a reaction kettle, and heating to 75 ℃;
2) adding 18 parts of sodium metaaluminate into the reaction kettle, and stirring for 1.5 hours;
3) keeping stirring, and slowly adding 14 parts of poly dimethyl diallyl ammonium chloride into the stirring kettle;
4) the temperature is reduced, the temperature is controlled at 38 ℃, and 3 parts of sodium humate, 22 parts of zinc oxide and 22 parts of calcium hypochlorite are added in turn while stirring.
5) Stirring for 3 hours, controlling the temperature at 50 ℃, and automatically cooling to normal temperature after 3 hours.
The flocculant prepared by the method is added into the printing and dyeing wastewater, so that the total solid removal rate of the printing and dyeing wastewater can reach 91%, the chroma removal rate can reach 95%, and the COD removal rate can reach 89%.
Example 4
Taking 12 parts of poly dimethyl diallyl ammonium chloride, 20 parts of sodium metaaluminate, 5 parts of sodium humate, 20 parts of zinc oxide, 20 parts of calcium hypochlorite and 20 parts of water. The flocculant is prepared according to the following steps:
1) 20 parts of water is taken and placed in a reaction kettle, and the temperature is heated to 75 ℃;
2) adding 20 parts of sodium metaaluminate into the reaction kettle, and stirring for 1.5 hours;
3) keeping stirring, and slowly adding 12 parts of poly dimethyl diallyl ammonium chloride into a stirring kettle;
4) the temperature is reduced, the temperature is controlled at 38 ℃, and 5 parts of sodium humate, 20 parts of zinc oxide and 20 parts of calcium hypochlorite are added in turn while stirring.
5) Stirring for 3 hours, controlling the temperature at 50 ℃, and automatically cooling to normal temperature after 3 hours.
The flocculant prepared by the method is added into the printing and dyeing wastewater, so that the total solid removal rate of the printing and dyeing wastewater can reach 89%, the chroma removal rate can reach 92%, and the COD removal rate can reach 85%.
Example 5
Taking 10 parts of poly dimethyl diallyl ammonium chloride, 26 parts of sodium metaaluminate, 8 parts of sodium humate, 15 parts of zinc oxide, 15 parts of calcium hypochlorite and 25 parts of water. The flocculant is prepared according to the following steps:
1) placing 25 parts of water in a reaction kettle, and heating to 75 ℃;
2) adding 26 parts of sodium metaaluminate into the reaction kettle, and stirring for 1.5 hours;
3) keeping stirring, and slowly adding 10 parts of poly dimethyl diallyl ammonium chloride into a stirring kettle;
4) the temperature is reduced, the temperature is controlled to be 38 ℃, and 8 parts of sodium humate, 15 parts of zinc oxide and 15 parts of calcium hypochlorite are added in turn while stirring.
5) Stirring for 3 hours, controlling the temperature at 50 ℃, and automatically cooling to normal temperature after 3 hours.
The flocculant prepared by the method is added into the printing and dyeing wastewater, so that the total solid removal rate of the printing and dyeing wastewater can reach 85%, the chroma removal rate can reach 90%, and the COD removal rate can reach 80%.
Comparative examples 1 to 5
The specific implementation method is the same as that of example 1, and the only difference is shown in table 1.
TABLE 1 influence of the raw material ratios on the flocculant
From table 1 it can be derived: from examples 1 to 5, it can be seen that the flocculant prepared by the raw material ratio in the range of the invention can ensure that the total solid removal rate of the printing and dyeing wastewater is more than 85%, the chroma removal rate can reach 90%, and the COD removal rate can reach more than 80%, thereby remarkably improving the flocculation and decolorizing capacity of the decolorizing flocculant for the printing and dyeing wastewater. As can be seen from comparative examples 1 to 5, the modification of the raw material ratio of the present invention not only provides a less effective result, but also may result in a failure in the production of flocculants, as shown in comparative example 4, in the absence of sodium metaaluminate, it is not possible to produce flocculants from the respective raw materials at all.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not intended to be limiting. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as within the scope of the invention.
Claims (10)
1. The flocculant is characterized by comprising the following raw materials: 8-14 parts of poly dimethyl diallyl ammonium chloride, 18-28 parts of sodium metaaluminate, 3-10 parts of sodium humate, 13-22 parts of zinc oxide, 13-22 parts of calcium hypochlorite and 18-27 parts of water by weight.
2. The flocculant according to claim 1,
10-12 parts of poly dimethyl diallyl ammonium chloride, 20-26 parts of sodium metaaluminate, 5-8 parts of sodium humate, 15-20 parts of zinc oxide, 15-20 parts of calcium hypochlorite and 20-25 parts of water.
3. The flocculant according to claim 1,
11 parts of poly dimethyl diallyl ammonium chloride, 24 parts of sodium metaaluminate, 8 parts of sodium humate, 18 parts of zinc oxide, 18 parts of calcium hypochlorite and 21 parts of water.
4. The preparation method of the flocculant is characterized by comprising the following steps of:
adding sodium metaaluminate and stirring;
adding polydimethyldiallyl ammonium chloride;
cooling, and adding sodium humate, zinc oxide and calcium hypochlorite;
heating and stirring, and cooling to room temperature.
5. The method of claim 4, wherein the temperature is heated to 70-80 ℃, preferably 75 ℃ after the addition of water.
6. The method for preparing sodium metaaluminate according to claim 4, wherein the stirring time for adding sodium metaaluminate is 1-2h, preferably 1.5 h.
7. The method according to claim 4, wherein the addition of sodium humate, zinc oxide and calcium hypochlorite reduces the temperature to 35-40 ℃, preferably to 38 ℃.
8. The preparation method according to claim 4, wherein the stirring time for adding the sodium humate, the zinc oxide and the calcium hypochlorite is 2-4h, preferably 3 h.
9. The method according to claim 4, wherein the temperature is raised to 45-55 ℃, preferably to 50 ℃ after the addition of the sodium humate, zinc oxide and calcium hypochlorite.
10. The preparation method according to claim 9, wherein the time period for controlling the temperature after adding the sodium humate, the zinc oxide and the calcium hypochlorite is 2-4 hours, and preferably the temperature is controlled for 3 hours.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115259194A (en) * | 2022-07-21 | 2022-11-01 | 中国铝业股份有限公司 | Method for removing humus in production process of aluminum oxide |
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