CN113023853A - Wastewater treatment agent and preparation method and application thereof - Google Patents
Wastewater treatment agent and preparation method and application thereof Download PDFInfo
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- CN113023853A CN113023853A CN202110352069.0A CN202110352069A CN113023853A CN 113023853 A CN113023853 A CN 113023853A CN 202110352069 A CN202110352069 A CN 202110352069A CN 113023853 A CN113023853 A CN 113023853A
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- 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
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment, and discloses a wastewater treatment agent, and a preparation method and application thereof. The wastewater treatment agent comprises modified diatomite, an iron ion flocculating agent, a nano oxide and macroporous resin; the modified diatomite is prepared by modifying graphene and polyacrylamide together; the nano oxide comprises nano silicon oxide and nano zinc oxide. According to the invention, the diatomite is modified by the graphene and the polyacrylamide together, so that the modified diatomite is more stable in structure, free from the influence of acid and alkali and strong in adsorption force. The invention also enhances the flocculation and adsorption effects by modifying the diatomite composite iron ion flocculant and the macroporous resin, so that the treating agent has good treatment effect, and especially has outstanding purification effect on suspended matters in the wastewater.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment agent, and a preparation method and application thereof.
Background
The papermaking process comprises the key steps of pulping, blending, papermaking, cutting and the like. In papermaking, a large amount of waste liquid is generated, and particularly, the pulping process comprises pulping and cooking waste liquid, washing waste water, bleaching waste water, white water of a paper machine and the like. The papermaking waste liquid has complex components and poor biodegradability and mainly comprises the following pollutants: (1) settleable and non-settleable suspended matter, mainly fibre and fibre fines; (2) easily biodegradable organic substances such as hemicellulose, methanol, acetic acid, formic acid, saccharides and the like; (3) organic matter difficult to biodegrade: such as lignin and macromolecular carbohydrates contained in the fibrous raw material; (4) toxic substances: rosin acid and unsaturated fatty acid contained in the black liquor; (5) acid-base poison: the pH value of the alkaline pulping waste water is 9-10, and the pH value of the acid pulping waste water is 1.2-2.0; (6) chroma: the residual lignin contained in the pulping waste water is highly colored.
The papermaking wastewater is one of important industrial pollution sources, and the treatment process is complex and the treatment difficulty is high, so that high attention is paid. At present, a plurality of methods are used for treating papermaking wastewater, and a plurality of treating agents are developed. However, most of the treating agents need to adjust the pH value of the wastewater to be close to a neutral value before being put into the device, otherwise, the effect is not good. The addition of acid and alkali inevitably increases new pollution and increases the treatment cost. Meanwhile, the content of suspended matters in the papermaking wastewater is high, and great difficulty is brought to wastewater treatment.
Therefore, it is highly desirable to provide a wastewater treatment agent which has a wide pH application range and can provide a good treatment effect on suspended matters in wastewater.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the wastewater treatment agent provided by the invention has a wide pH application range and can have a good treatment effect on suspended matters in wastewater.
The invention conception is as follows: according to the invention, the diatomite is modified by the graphene and the polyacrylamide together, so that micropores of the modified diatomite are prevented from being damaged by roasting, the specific surface area is maximized, and the adsorption capacity is improved; and the graphene layer can enhance the tight combination of the diatomite and the polyacrylamide, has strong structural stability and is not influenced by acidity and alkalinity. Meanwhile, the modified diatomite is compounded with the iron ion flocculant, the nano oxide and the macroporous resin, so that the modified diatomite can have a good treatment effect on suspended matters in the wastewater.
Specifically, the wastewater treatment agent comprises modified diatomite, an iron ion flocculating agent, a nano oxide and macroporous resin; the modified diatomite is prepared by jointly modifying graphene and polyacrylamide; the nano oxide comprises nano silicon oxide and nano zinc oxide.
Research shows that although the roasting can remove impurities covering the surface or in the micropores of the diatomite and is beneficial to improving the surface property and the micropore structure of the diatomite, when the roasting temperature is higher than 400 ℃, the roasting can seriously damage the diatomite shell, so that the micropores disappear along with the splitting or collapse of the shell, the specific surface area is reduced, and the adsorption capacity is weakened. And the impurities on the surface or in the micropores of the diatomite cannot be completely removed if the roasting temperature is not enough. Therefore, it is important to effectively remove impurities without affecting the microporous structure. The inventor finds that the high temperature resistance of the diatomite can be improved after the diatomite is modified by the graphene, so that the structure of the diatomite cannot be damaged when the temperature is higher than 400 ℃.
Preferably, the wastewater treatment agent comprises the following components in parts by weight:
further preferably, the wastewater treatment agent comprises the following components in parts by weight:
preferably, the ferric ion flocculant is selected from at least one of polymeric ferric sulfate, polymeric ferric chloride silicate, polymeric ferric silicate sulfate, polymeric ferric phosphate chloride or polymeric ferric phosphate sulfate.
Preferably, the mass ratio of the nano silicon oxide to the nano zinc oxide is (1-3): (1-3); further preferably, the mass ratio of the nano silicon oxide to the nano zinc oxide is (1-2): (1-2). The nano silicon oxide and the nano zinc oxide can further promote the modified diatomite to act with macromolecular substances such as lignin, cellulose and the like to form a net-shaped or even spherical structure, so that the wastewater treatment efficiency is improved, and particularly, the purification effect on suspended matters is good; meanwhile, the nano silicon oxide and the nano zinc oxide have strong oxidizing property and sterilization effect, and other degerming agents are not required to be added.
Preferably, the diameter of the macroporous resin is 0.06-1.2 mm; further preferably, the diameter of the macroporous resin is 0.2-1.2 mm.
Preferably, the macroporous resin is an ion exchange resin. The macroporous resin has good adsorption effect on organic matters, macromolecular polymers and metal ions, can adsorb organic matters which are not adsorbed by the modified diatomite, and can adsorb scattered and fine structures formed by the modified diatomite.
Preferably, the composition of the wastewater treatment agent further comprises tannin. More preferably, the mass portion of the tannin is 1-10. The tannin enhances the adhesive force of organic matters, metal ions and the water treatment agent, so that the treatment agent can well adsorb the metal ions and other chemical additives in the wastewater.
Preferably, the wastewater treatment agent further comprises 1-5 parts of an oxidizing agent; further preferably, the oxidizing agent is potassium permanganate.
The invention also provides a preparation method of the wastewater treatment agent, which comprises the following steps:
and mixing the modified diatomite and the nano oxide, standing, adding the rest components, heating and stirring to obtain the wastewater treatment agent.
Preferably, the standing time is 2-6 h.
Preferably, the heating and stirring temperature is 40-60 ℃, and the heating and stirring time is 1-4 h.
Preferably, the preparation method of the modified diatomite comprises the following steps:
(1) mixing graphene and diatomite, roasting, crushing and grinding to obtain graphene modified diatomite;
(2) and (2) dissolving polyacrylamide in a solvent, adding the graphene modified diatomite prepared in the step (1), mixing, standing and drying to obtain the modified diatomite.
Preferably, the roasting temperature in the step (1) is 450-; it is further preferable that the calcination temperature in step (1) is 500-700 ℃, and the calcination time in step (1) is 2-3 h.
Preferably, the standing time in the step (2) is 1-3 h.
Specifically, the preparation method of the wastewater treatment agent comprises the following steps:
(1) weighing graphene and diatomite, and stirring for 1-3h at the stirring speed of 200 plus 300 revolutions per minute to fully and uniformly mix the graphene and the diatomite; then roasting at the temperature of 450-800 ℃ for 1-4h, cooling, crushing, grinding, and sieving with a 60-100-mesh sieve to obtain graphene modified diatomite;
(2) then adding polyacrylamide to dissolve in a solvent, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 200-300 r/min for 1-3h to fully and uniformly mix the graphene modified diatomite; then standing for 2-6h, and drying for 1-5 h at 50-80 ℃ to obtain the modified diatomite.
(3) And (2) taking the modified diatomite and the nano oxide, stirring for 1-3h at the stirring speed of 200-300 r/min, standing for 1-3h, adding an iron ion flocculant, macroporous resin, tannin and an oxidant, and stirring for 1-4h at the temperature of 40-60 ℃ to obtain the wastewater treatment agent.
The invention also provides an application of the wastewater treatment agent.
In particular to the application of the wastewater treatment agent in purifying papermaking wastewater.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the diatomite is protected by utilizing the high temperature resistance of the graphene, so that impurities on the surface or in the micropores can be removed when the diatomite is roasted at a high temperature, but the diatomite shell is not damaged to collapse or disappear the micropores, and the specific surface area of the diatomite is maximized. Meanwhile, the graphene layer on the surface of the diatomite or in the micropores promotes the connection of polyacrylamide, so that the polyacrylamide modified diatomite is stable in structure, free of the influence of acid and alkali, stable in structure under different pH values and strong in adsorption force.
(2) The wastewater treatment agent provided by the invention enhances the flocculation and adsorption effects by modifying the diatomite composite iron ion flocculant and the macroporous resin, so that the treatment agent has a good treatment effect, and especially has an outstanding purification effect on suspended matters in wastewater.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
Example 1
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2 (purchased from Tianjin Kaishi resin science and technology Co., Ltd.), the diameter is 0.3-1.25mm, and the ferric ion flocculant is polyferric sulfate.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 50g of graphene and 500g of diatomite, and stirring at a stirring speed of 250 revolutions per minute for 3 hours to fully and uniformly mix the graphene and the diatomite; then roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain graphene modified diatomite;
(2) then, dispersing 80g of polyacrylamide in water, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 300 revolutions per minute for 3 hours to fully and uniformly mix the polyacrylamide and the diatomite; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) stirring 200g of modified diatomite, 30g of nano zinc oxide and 40g of nano silicon oxide at a stirring speed of 200 r/min for 2h, standing for 2h, adding 180g of iron ion flocculant, 100g of macroporous resin, 30g of tannin and 20g of potassium permanganate, and stirring at 50 ℃ for 2h to obtain the wastewater treatment agent.
Example 2
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2, the diameter is 0.3-1.25mm, and the iron ion flocculant is ferric polysilicate chloride.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 50g of graphene and 500g of diatomite, and stirring at a stirring speed of 250 revolutions per minute for 3 hours to fully and uniformly mix the graphene and the diatomite; then roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain graphene modified diatomite;
(2) then, dispersing 80g of polyacrylamide in water, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 300 revolutions per minute for 3 hours to fully and uniformly mix the polyacrylamide and the diatomite; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) taking 280g of modified diatomite, 60g of nano zinc oxide and 60g of nano silicon oxide, stirring for 2 hours at a stirring speed of 200 r/min, standing for 2 hours, adding 160g of iron ion flocculant, 80g of macroporous resin, 30g of tannin and 20g of potassium permanganate, and stirring for 2 hours at 50 ℃ to obtain the wastewater treatment agent.
Example 3
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2, the diameter is 0.3-1.25mm, and the iron ion flocculating agent is polyferric sulfate.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 50g of graphene and 500g of diatomite, and stirring at a stirring speed of 250 revolutions per minute for 3 hours to fully and uniformly mix the graphene and the diatomite; then roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain graphene modified diatomite;
(2) then, dispersing 80g of polyacrylamide in water, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 300 revolutions per minute for 3 hours to fully and uniformly mix the polyacrylamide and the diatomite; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) taking 350g of modified diatomite, 60g of nano zinc oxide and 40g of nano silicon oxide, stirring for 2 hours at a stirring speed of 200 r/min, standing for 2 hours, adding 120g of iron ion flocculant, 50g of macroporous resin, 30g of tannin and 20g of potassium permanganate, and stirring for 2 hours at 50 ℃ to obtain the wastewater treatment agent.
Example 4
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2, the diameter is 0.3-1.25mm, and the iron ion flocculant is ferric polysilicate chloride.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 50g of graphene and 500g of diatomite, and stirring at a stirring speed of 250 revolutions per minute for 3 hours to fully and uniformly mix the graphene and the diatomite; then roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain graphene modified diatomite;
(2) then, dispersing 80g of polyacrylamide in water, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 300 revolutions per minute for 3 hours to fully and uniformly mix the polyacrylamide and the diatomite; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) taking 280g of modified diatomite, 20g of nano zinc oxide and 100g of nano silicon oxide, stirring for 2 hours at a stirring speed of 200 r/min, standing for 2 hours, adding 160g of iron ion flocculant, 80g of macroporous resin, 30g of tannin and 20g of potassium permanganate, and stirring for 2 hours at 50 ℃ to obtain the wastewater treatment agent.
Example 5
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2, the diameter is 0.3-1.25mm, and the iron ion flocculant is ferric polysilicate chloride.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 50g of graphene and 500g of diatomite, and stirring at a stirring speed of 250 revolutions per minute for 3 hours to fully and uniformly mix the graphene and the diatomite; then roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain graphene modified diatomite;
(2) then, dispersing 80g of polyacrylamide in water, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 300 revolutions per minute for 3 hours to fully and uniformly mix the polyacrylamide and the diatomite; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) taking 280g of modified diatomite, 60g of nano zinc oxide and 60g of nano silicon oxide, stirring for 2 hours at a stirring speed of 200 r/min, standing for 2 hours, adding 160g of iron ion flocculant, 80g of macroporous resin and 20g of potassium permanganate, and stirring for 2 hours at 50 ℃ to obtain the wastewater treatment agent.
Comparative example 1
Comparative example 1 is different from example 2 in that diatomaceous earth in comparative example 1 is modified with polyacrylamide only, and the remaining components and preparation method are the same as those of example 2.
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2, the diameter is 0.3-1.25mm, and the iron ion flocculant is ferric polysilicate chloride.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 500g of diatomite, roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain roasted diatomite;
(2) then, 80g of polyacrylamide is dispersed in water, and the roasted diatomite prepared in the step (1) is added and stirred for 3 hours at the stirring speed of 300 r/min, so that the mixture is fully and uniformly mixed; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) taking 280g of modified diatomite, 60g of nano zinc oxide and 60g of nano silicon oxide, stirring for 2 hours at a stirring speed of 200 r/min, standing for 2 hours, adding 160g of iron ion flocculant, 80g of macroporous resin, 30g of tannin and 20g of potassium permanganate, and stirring for 2 hours at 50 ℃ to obtain the wastewater treatment agent.
Comparative example 2
Comparative example 2 is different from example 2 in that the nano-oxide in comparative example 2 contains only nano-silica, and the rest of the components and the preparation method are the same as those in example 2.
A wastewater treatment agent consists of the following components:
the macroporous resin is YKHCN-2, the diameter is 0.3-1.25mm, and the iron ion flocculant is ferric polysilicate chloride.
A preparation method of a wastewater treatment agent comprises the following steps:
(1) weighing 50g of graphene and 500g of diatomite, and stirring at a stirring speed of 250 revolutions per minute for 3 hours to fully and uniformly mix the graphene and the diatomite; then roasting at 650 ℃ for 3h, cooling, crushing, grinding, and sieving with a 80-mesh sieve to obtain graphene modified diatomite;
(2) then, dispersing 80g of polyacrylamide in water, adding the graphene modified diatomite prepared in the step (1), and stirring at a stirring speed of 300 revolutions per minute for 3 hours to fully and uniformly mix the polyacrylamide and the diatomite; then standing for 5h, and drying at 60 ℃ for 3h to obtain the modified diatomite.
(3) And (2) taking 280g of modified diatomite and 120g of nano silicon oxide, stirring for 2 hours at the stirring speed of 200 r/min, standing for 2 hours, adding 160g of iron ion flocculant, 80g of macroporous resin, 30g of tannin and 20g of potassium permanganate, and stirring for 2 hours at 50 ℃ to obtain the wastewater treatment agent.
Comparative example 3
Comparative example 3 is different from example 2 in that 8 parts of macroporous resin in comparative example 3 is replaced by 4 parts of modified diatomaceous earth and 4 parts of iron ion flocculant, and the rest of the components and the preparation method are the same as those in example 2.
Product effectiveness testing
The wastewater from the paper mill was treated with the wastewater treatment agents prepared in examples 1 to 5 and comparative examples 1 to 3, and samples of the wastewater filtered through a grid, including wastewater samples 1, 2 and 3, were taken.
The wastewater treatment agents obtained in examples 1 to 5 and comparative examples 1 to 3 were weighed, added to wastewater samples 1 to 3 at an addition amount of 15mg/L, and the SS concentration (suspended solid concentration), BOD value (biochemical oxygen demand), COD value (chemical oxygen demand) and pH value were measured.
Wherein the properties of the wastewater sample 1 before treatment are as follows: the pH value is 12.5, the SS concentration is 4.2mg/L, BOD, the SS concentration is 120mg/L, COD, and the SS concentration is 170 mg/L.
Wastewater sample 2, properties before treatment were as follows: the pH value is 4.5, the SS concentration is 3.7mg/L, BOD, the value is 167mg/L, COD, and the value is 145 mg/L.
Wastewater sample 3, properties before treatment were as follows: the pH value is 6.8, the SS concentration is 4.8mg/L, BOD, the SS concentration is 214mg/L, COD, and the SS concentration is 253 mg/L.
The test results are shown in tables 1-3.
TABLE 1 wastewater sample 1 treatment
| SS(mg/L) | BOD(mg/L) | COD(mg/L) | pH value | |
| Example 1 | 0.26 | 11.8 | 15.9 | 10.8 |
| Example 2 | 0.21 | 10.2 | 15.1 | 10.3 |
| Example 3 | 0.30 | 12.1 | 17.5 | 10.6 |
| Example 4 | 0.35 | 15.5 | 18.1 | 10.5 |
| Example 5 | 0.38 | 17.5 | 20.5 | 10.4 |
| Comparative example 1 | 0.98 | 22.6 | 35.5 | 10.9 |
| Comparative example 2 | 1.55 | 27.5 | 33.7 | 11.1 |
| Comparative example 3 | 1.9 | 30.3 | 47.1 | 10.8 |
TABLE 2 wastewater sample 2 treatment
| SS(mg/L) | BOD(mg/L) | COD(mg/L) | pH value | |
| Example 1 | 0.21 | 14.8 | 14.8 | 5.4 |
| Example 2 | 0.15 | 13.5 | 12.2 | 5.6 |
| Example 3 | 0.22 | 15.1 | 15.1 | 5.8 |
| Example 4 | 0.26 | 20.2 | 17.2 | 5.3 |
| Example 5 | 0.28 | 25.5 | 20.5 | 5.7 |
| Comparative example 1 | 0.87 | 38.9 | 20.5 | 5.2 |
| Comparative example 2 | 1.28 | 46.5 | 17.8 | 5.1 |
| Comparative example 3 | 1.70 | 57.4 | 32.4 | 5.2 |
TABLE 3 wastewater sample 3 treatment
| SS(mg/L) | BOD(mg/L) | COD(mg/L) | pH value | |
| Example 1 | 0.27 | 14.2 | 17.9 | 7.1 |
| Example 2 | 0.12 | 13.2 | 15.8 | 7.0 |
| Example 3 | 0.29 | 13.8 | 18.5 | 7.1 |
| Example 4 | 0.32 | 15.6 | 25.5 | 7.3 |
| Example 5 | 0.37 | 18.9 | 26.2 | 7.3 |
| Comparative example 1 | 0.99 | 24.1 | 51.0 | 6.9 |
| Comparative example 2 | 1.72 | 29.6 | 66.7 | 7.0 |
| Comparative example 3 | 1.95 | 35.3 | 67.1 | 6.8 |
As can be seen from the table, after the wastewater treatment agents of examples 1 to 5 are used for treating wastewater, the wastewater under different pH values is well treated, the SS concentration is reduced by 91 to 97.5 percent, the BOD value is reduced by 84 to 94 percent, the COD value is reduced by 84 to 94 percent, and particularly, the purification effect on solid suspended matters is excellent. The wastewater treatment agent prepared in the comparative example is obviously inferior to the examples.
Claims (10)
1. A wastewater treatment agent is characterized by comprising modified diatomite, an iron ion flocculating agent, a nano oxide and macroporous resin; the modified diatomite is prepared by jointly modifying graphene and polyacrylamide; the nano oxide comprises nano silicon oxide and nano zinc oxide.
2. The wastewater treatment agent according to claim 1, comprising the following components in parts by weight:
3. the wastewater treatment agent according to claim 1 or 2, wherein the mass ratio of the nano silicon oxide to the nano zinc oxide is (1-3): (1-3).
4. The wastewater treatment agent according to claim 1 or 2, wherein the components of the wastewater treatment agent further comprise tannin.
5. The wastewater treatment agent according to claim 1 or 2, wherein the diameter of the macroporous resin is 0.06-1.2 mm.
6. The wastewater treatment agent according to claim 1 or 2, wherein the ferric ion flocculant is selected from at least one of polyferric sulfate, polyferric sulfate polychloride, polyferric silicate chloride, polyferric silicate sulfate, polyferric phosphate chloride or polyferric phosphate sulfate.
7. The method for producing a wastewater treatment agent according to any one of claims 1 to 6, comprising the steps of:
and mixing the modified diatomite and the nano oxide, standing, adding the rest components, heating and stirring to obtain the wastewater treatment agent.
8. The method according to claim 7, wherein the modified diatomaceous earth is prepared by the method comprising the steps of:
(1) mixing graphene and diatomite, roasting, crushing and grinding to obtain graphene modified diatomite;
(2) and (2) dissolving polyacrylamide in a solvent, adding the graphene modified diatomite prepared in the step (1), mixing, standing and drying to obtain the modified diatomite.
9. The method as claimed in claim 8, wherein the temperature of the calcination in the step (1) is 450-800 ℃.
10. Use of the wastewater treatment agent according to any one of claims 1 to 6 for purifying paper making wastewater.
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