CN108190976B - Wastewater treatment agent, preparation method and application method thereof - Google Patents
Wastewater treatment agent, preparation method and application method thereof Download PDFInfo
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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
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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
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
Abstract
The invention relates to a wastewater treatment agent, a preparation method and a use method thereof, and the wastewater treatment agent comprises a compound A and a compound B, wherein the compound A comprises the following components in parts by weight: 20 parts of iron-carbon spherical particles; 10 parts of citric acid; the compound B comprises the following components in parts by weight: 30 parts of sodium persulfate; 20 parts of coated potassium ferrate; 10 parts of lime; 10 parts of diatomite; the mass ratio of the compound A to the compound B is 1: 2-6; in addition, the invention also provides a preparation method and a using method of the wastewater treatment agent. The wastewater treatment agent and the wastewater treatment method thereof can effectively shorten the treatment time of wastewater and improve the degradation rate of each substance in the wastewater.
Description
Technical Field
The invention relates to a water purification treatment technology, in particular to a wastewater treatment agent, a preparation method and a use method thereof.
Background
Along with the development of urbanization and industrialization in China, the discharge amount of urban sewage is continuously increased, the quantity and the types of organic matters entering a water body are rapidly increased, and serious pollution to water resources is caused. For wastewater containing refractory organic pollutants, the traditional biological treatment can not meet the treatment requirements, and a more effective method is required to be further used.
At present, the most effective method for treating the organic pollutants difficult to degrade in the wastewater is a deep oxidation technology, which is a water treatment technology for rapidly and completely oxidizing the organic matters by using free radicals (such as. OH) generated by a high-grade oxidant, and is characterized in that a large amount of free radicals are generated and participated, the reaction speed is high, the treatment is complete, and Disinfection Byproducts (DBPs) are not generated. The currently used higher oxidants mainly include Fenton (Fenton) reagent, sodium persulfate, potassium ferrate, and the like. The Fenton reagent has strong oxidizability, but is only suitable for acidic wastewater (pH 2-4), and a catalyst (Fe) exists2+) Large consumption, low utilization rate of hydrogen peroxide and the like; sodium persulfate has stronger oxidability under acidic condition than alkaline condition, andgood stability and wide application range, but can form sulfate radical (SO) by activating treatment of catalyst, such as transition metal, heat and ultraviolet light4-) The problems of low catalyst utilization rate, secondary pollution and the like exist. The potassium ferrate is a high-efficiency multifunctional water treatment agent integrating oxidation, adsorption and flocculation, the reaction product is ferric oxide or ferric hydroxide, secondary pollution is not caused, but the oxidation selectivity of the potassium ferrate in the sewage treatment process is poor, only toxic substances around the potassium ferrate can be oxidized, and the rest of the potassium ferrate can react with water molecules, so that the problems of unobvious water treatment effect, low use value and the like exist. In addition, the waste water treatment adopts a plurality of methods and an iron-carbon material micro-electrolysis treatment method (also called internal electrolysis, zero-valent iron method and the like), is a method for degrading organic pollutants by forming a plurality of tiny primary batteries through iron and carbon and generating free hydrogen and active oxygen by virtue of reduction and oxidation of the battery reaction, and has the advantages of simple process, low cost and the like.
But any water treatment method is independently used, and the achieved treatment effect is common; the chemical reaction exists among different methods for treating the medicaments, so that the medicaments are invalid, and the treatment efficiency is reduced when the methods are combined; in addition, when multiple methods are combined, the medicaments cannot be compounded, only a mode of sequentially feeding the medicaments is adopted, so that the wastewater is sequentially treated by different medicaments, the operation is complicated, the efficiency is low, a large amount of manpower and material resources are consumed, and the treatment cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a wastewater treatment agent, a preparation method and a use method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the first technical scheme is as follows:
a waste water treating agent is composed of compound A and compound B,
the compound A comprises the following components in parts by weight:
20 parts of iron-carbon spherical particles;
10 parts of citric acid;
the compound B comprises the following components in parts by weight:
the mass ratio of the compound A to the compound B is 1: 2 to 6.
Further, the lime is selected from one or two of quick lime and hydrated lime;
the coating wall material of the coated potassium ferrate is selected from one or more of paraffin, polyethylene wax and granular wax.
Further, the preparation method comprises the following steps:
step 1, weighing iron-carbon spherical particles and citric acid according to parts by weight, and uniformly mixing to obtain a compound A;
step 2, activating the diatomite, weighing sodium persulfate, slow-release potassium ferrate, lime and the diatomite according to parts by weight, and uniformly mixing to obtain a compound B;
and 3, weighing the compound A and the compound B according to the proportion, and respectively packaging and storing the compound A and the compound B.
Further, the compound B also comprises 5 parts of carboxymethyl cellulose; 1 part of polyethylene glycol, 20 parts of ethyl cellulose, 5 parts of an acidic effervescent agent, 2.5 parts of an alkaline effervescent agent, 10 parts of slice paraffin, 2 parts of ammonium chloride and 0-2.5 parts of sodium bicarbonate.
Further, the acidic effervescent agent is selected from one or more of citric acid, tartaric acid, oxalic acid, maleic acid, fumaric acid, succinic acid and adipic acid;
the alkaline effervescent agent is selected from one or more of sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, calcium carbonate and ammonium bicarbonate.
Further, the preparation method comprises the following steps:
the method comprises the following steps: preparation of Complex A
Weighing iron-carbon spherical particles and citric acid according to the weight parts, and uniformly mixing to obtain a compound A;
step two: preparation of Complex B
Step 2-1, weighing the raw materials according to the parts by weight, taking 1/2 of the total mass of the calcium oxide and the coated potassium ferrate, uniformly mixing the raw materials with the carboxymethyl cellulose and the polyethylene glycol, and granulating to obtain core material particles;
step 2-2, adding 1/3 of the total amount of the ethyl cellulose into a normal hexane solution, heating and refluxing, adding activated diatomite, sodium persulfate, an acidic effervescent agent and an alkaline effervescent agent after the ethyl cellulose becomes a transparent solution, stirring and dispersing uniformly, spraying the mixture on core material particles, and airing or drying to remove the normal hexane to obtain inner cladding layer particles;
step 2-3, heating the paraffin to 80 ℃ to melt, adding ammonium chloride while stirring, spraying the ammonium chloride on the inner cladding layer particles after uniform dispersion, and cooling to obtain paraffin-coated particles;
2-4, adding the rest ethyl cellulose into a normal hexane solution, heating and refluxing, adding the rest coated potassium ferrate after the ethyl cellulose becomes a transparent solution, selectively adding sodium bicarbonate, stirring and dispersing uniformly, then spraying the mixture on paraffin coated particles, and airing or drying to remove the normal hexane to obtain a compound B;
step three, mixing:
and (3) weighing the compound A prepared in the step one and the compound B prepared in the step two according to the proportion, and uniformly mixing to obtain the wastewater treatment agent.
The second technical scheme is as follows:
a method of using a wastewater treatment agent comprising the steps of:
firstly, uniformly putting 0.2-0.4 Kg of compound A into each liter of wastewater, and stirring and reacting until the pH value is more than or equal to 7;
then, uniformly adding 70Kg of the compound B into each liter of wastewater corresponding to 0.6-0.8 Kg of the compound B, stirring and reacting until the potassium ferrate in the wastewater is completely consumed, and standing for 2-3 days; and (4) finishing.
The third technical scheme is as follows:
a method of using a wastewater treatment agent comprising the steps of:
putting the compound A and the compound B into wastewater together according to 0.2-0.4 Kg of compound A and 0.6-0.8 Kg of compound B per liter of wastewater, stirring and reacting for 24 hours, and standing for 2-3 days; and (4) finishing.
The technical scheme is as follows:
a method of using a wastewater treatment agent comprising the steps of:
adding 1.3-1.8 Kg of wastewater treatment agent into each liter of wastewater, adding the wastewater treatment agent into the wastewater, stirring for reacting for 24 hours, and standing for 2-3 days; and (4) finishing.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention applies the iron-carbon electrolysis method, the sodium persulfate oxidation method, the potassium ferrate oxidation method and the diatomite adsorption flocculation method to the treatment of the wastewater in a combined way, and treats the wastewater after the iron-carbon electrolysis under the alkaline condition after the sodium persulfate, the potassium ferrate and the diatomite are compounded, thereby obviously enhancing the treatment effect of the wastewater2+The effect on potassium ferrate, and in addition, the presence of calcium oxide makes Fe3+Formation of Fe (OH)3The presence of the colloid, and diatomaceous earth, promotes Fe (OH)3Flocculation precipitation of colloid, thereby reducing Fe3+Catalysis effect on high-iron acidolysis.
2. The invention compounds iron-carbon sphere particles, citric acid, sodium persulfate, potassium ferrate, calcium oxide and diatomite, and then puts them into waste water together for waste water treatment+With OH-The neutralization reaction occurs, which theoretically reduces the treatment effect of the iron-carbon particles, while the ferrate decomposition encounters Fe produced by the iron-carbon2+Then potassium ferrate will react with Fe2+Oxidation-reduction reaction occurs to reduce the activity of acid hydrolysis of high iron, and in addition, Fe2 +Is oxidized into Fe3+Then, Fe3+The presence of which also promotes the decomposition of potassium ferrate, so that in theory the treatment effect of the process is considerably reduced, but tests have surprisingly shown that, when this process is used, NH occurs3The treatment effects of-N, TP and TN were not reduced, while the treatment effects of COD and SS were slightly improved, which may be a certain degree of synergy among the iron-carbon sphere particles, sodium persulfate and the acid hydrolysis of ferric iron, and the treatment effects were maintained even in the presence of various unfavorable conditions.
3. In the invention, potassium ferrate, sodium persulfate, kieselguhr and calcium oxide are coated in layers to prepare a compound B, and the compound B is compounded with iron-carbon sphere particles and citric acid to be put into wastewater for use, in the wastewater treatment process, the outermost layer of the compound B is firstly disintegrated, part of potassium ferrate is dissolved in the wastewater and generates a synergistic effect with the iron-carbon sphere particles, the reaction of ammonium chloride and alkali is accelerated when the pH value of the wastewater is increased to an alkaline condition along with the progress of an electrolytic reaction, so that the paraffin layer of the compound B is dissolved to form holes, the wastewater is permeated into an inner coating layer of the compound B, an acidic effervescent agent and an alkaline effervescent agent in the inner coating layer generate an acid-alkali neutralization reaction to generate a large amount of other substances after being dissolved in the wastewater, the inner coating layer generates disintegration, the calcium oxide, the sodium persulfate and the kieselguhr are dissolved in the wastewater, and meanwhile, the core particles are gradually dissolved after, ferrate is decomposed and slowly released, and the existence of sodium persulfate on one hand leads residual Fe in the wastewater2+Oxidation to Fe3+Decrease Fe2+The reaction probability with potassium ferrate is conveniently synergistic with the decomposition of the potassium ferrate, so that the decomposition failure probability of the potassium ferrate due to self collision is reduced; while the quicklime (the main component of which is calcium oxide) generates a large amount of heat when meeting water to generate calcium hydroxide, which promotes the activation of sodium persulfate, and in addition, the calcium oxide and OH-And also with Fe3+Fe (OH) formed by the reaction3The colloid has adsorption and flocculation effects on suspended matters in the wastewater, so that the treatment rate of the suspended matters in the wastewater is enhanced, and the diatomite can adsorb the flocculated suspended matters and promote Fe (OH)3Precipitation of colloids and reduction of Fe3+The method can exert the synergistic effect of iron-carbon sphere particles, sodium persulfate and the acid hydrolysis of the high iron to the utmost extent and reduce Fe2+And Fe3+The influence on potassium ferrate and calcium oxide on iron-carbon sphere particles, thereby optimizing the treatment effect.
4. In addition, sodium bicarbonate is added into the outermost layer of the compound B, and reacts with acidic wastewater (the wastewater can be adjusted to be acidic by citric acid in the compound A) to generate a large number of bubbles, so that the disintegration of the outermost layer of the compound B is promoted, the inner coating layer and the outermost layer are effectively separated by the paraffin layer, the inner coating layer is protected when the outermost layer is disintegrated, and the paraffin layer can form holes when reaching proper conditions by adding ammonium chloride so that the wastewater enters the inner coating layer; thereby promoting disintegration and dissolution of the inner coating layer, and dissolving out substances in the inner coating layer and the core material particles to participate in wastewater treatment.
5. The potassium ferrate of the invention adopts the coated potassium ferrate to achieve the slow release effect of the potassium ferrate, and the time of the potassium ferrate in the wastewater is prolonged, thereby enhancing the effect of wastewater treatment.
The wastewater treatment agent and the wastewater treatment method thereof can effectively shorten the treatment time of wastewater, improve the degradation rate of various substances in the wastewater and enhance the wastewater treatment effect.
Detailed Description
The present invention will be described in further detail with reference to examples.
The preparation method of the iron-carbon spherical particles comprises the following steps: firstly, mixing iron powder, activated carbon, graphite, calcium carbonate powder, bentonite and attapulgite according to a mass ratio of 6: 2: 0.5: 0.5: 0.5: 1, uniformly mixing and stirring, performing wet granulation, drying and sieving to obtain raw material granules; and then transferring the obtained raw material particles to a tubular furnace, and sintering at 800 ℃ for 6 hours under the protection of nitrogen to form iron-carbon spherical particles. Wherein, the calcium carbonate powder can reduce the degradation energy of organic matters in the reaction process, and the bentonite and the attapulgite can slow down the hardening of iron-carbon sphere particles.
The preparation method of the coated potassium ferrate comprises the following steps: taking polyethylene wax as a coating wall material, firstly heating the polyethylene wax to 150 ℃ for melting, and then mixing the polyethylene wax and potassium ferrate 1: 1, adding potassium ferrate, carrying out ultrasonic dispersion for 2 hours until the potassium ferrate is uniform, then sucking a polyethylene wax solution dispersed with the potassium ferrate, quickly dropping the polyethylene wax solution into cold water at 1-4 ℃, cooling, drying, grinding and crushing, sieving by a 150-mesh sieve, and storing in a drier for later use (after detection, the content of the potassium ferrate in the coated potassium ferrate is 50%).
The activation method of the diatomite comprises the following steps: firstly, adding 0.5mL of concentrated sulfuric acid into each gram of diatomite, roasting the diatomite on an electromagnetic oven until the concentrated sulfuric acid is completely volatilized, and then, roasting the diatomite in a muffle furnace at 500 ℃ for 15 min; after the diatomite is cooled to room temperature, the mass volume ratio of the diatomite to the dilute sulfuric acid is 1 g: and 10mL, adding 0.2mol/L dilute sulfuric acid into the cooled diatomite, stirring at 50-60 ℃ for 1h to remove impurities (alkaline oxides), washing with distilled water to be neutral, drying, and sieving with a 80-mesh sieve for later use. The diatomite activated by the method has the porosity of more than 90 percent, the ferric oxide content of less than 0.5 percent and the alumina content of 1 percent.
Example 1
A waste water treating agent is composed of compound A and compound B,
the compound A comprises the following components in parts by weight:
20Kg of iron-carbon pellets;
10Kg of citric acid;
the compound B comprises the following components in parts by weight:
the mass ratio of the compound A to the compound B is 1: 2.33.
the preparation method comprises the following steps:
step 1, weighing 20Kg of iron-carbon sphere particles and 10Kg of citric acid, and uniformly mixing to obtain a compound A;
step 2, after the diatomite is activated, weighing 30Kg of sodium persulfate, 20Kg of slow-release potassium ferrate, 10Kg of quick lime and 10Kg of diatomite, and uniformly mixing to obtain a compound B;
step 3, the mass ratio of the compound A to the compound B is 1: 2.33, weighing the compound A and the compound B, and respectively packaging and storing.
The using method comprises the following steps:
firstly, according to the proportion that each liter of wastewater corresponds to 0.3Kg of compound A, 15Kg of compound A is evenly put into 50L of wastewater, and the mixture is stirred and reacts until the pH value is more than or equal to 7;
then, according to the proportion that each liter of wastewater corresponds to 0.7Kg of compound B, 35Kg of compound B (the content of potassium ferrate in 35Kg of compound B is detected to be 5Kg, and the content of sodium persulfate is detected to be 15Kg) is uniformly added into the wastewater (the wastewater with the pH value of more than or equal to 7 after being treated by the compound A), and the mixture is stirred for reaction until the potassium ferrate in the wastewater is completely consumed, and then is kept stand for 2-3 days; and (4) finishing.
The method for judging the end point of complete potassium ferrate consumption comprises the following steps: and (3) determining the content of the potassium ferrate in the wastewater by adopting a chromite titration method, and if the potassium ferrate cannot be detected, completely consuming the potassium ferrate.
Example 2
A waste water treating agent is composed of compound A and compound B,
the compound A comprises the following components in parts by weight:
20Kg of iron-carbon pellets;
10Kg of citric acid;
the compound B comprises the following components in parts by weight:
the mass ratio of the compound A to the compound B is 1: 2.33.
the preparation method comprises the following steps:
step 1, weighing 30Kg of iron-carbon sphere particles and 10Kg of citric acid, and uniformly mixing to obtain a compound A;
step 2, after the diatomite is activated, weighing 30Kg of sodium persulfate, 20Kg of slow-release potassium ferrate, 10Kg of quick lime and 10Kg of diatomite, and uniformly mixing to obtain a compound B;
step 3, the mass ratio of the compound A to the compound B is 1: 2.33, weighing the compound A and the compound B, and respectively packaging and storing.
The using method comprises the following steps:
according to the method, 0.3Kg of compound A and 0.7Kg of compound B correspond to each liter of wastewater, 15Kg of compound A and 35Kg of compound B (after detection, the content of potassium ferrate in 35Kg of compound B is 5Kg, and the content of sodium persulfate is 15Kg) are put into 50L of wastewater together, stirred and reacted for 24 hours (at the moment, both potassium ferrate and sodium persulfate are completely consumed), and then kept stand for 2-3 days; and (4) finishing.
Example 3
A waste water treating agent is composed of compound A and compound B,
the compound A comprises the following components in parts by weight:
20Kg of iron-carbon pellets;
10Kg of citric acid;
the compound B comprises the following components in parts by weight:
the mass ratio of the compound A to the compound B is 1: 3.97.
the preparation method comprises the following steps:
the method comprises the following steps: preparation of Complex A
Weighing 20Kg of iron-carbon spherical particles and 10Kg of citric acid, and uniformly mixing to obtain a compound A;
step two: preparation of Complex B
Step 2-1, weighing each raw material, taking 10Kg of quicklime and 1/2 (10 Kg) of the total weight of the coated potassium ferrate, uniformly mixing the quicklime and the 1/2 with 5Kg of carboxymethyl cellulose and 1Kg of polyethylene glycol, and granulating to obtain core material particles;
step 2-2, according to the mass volume ratio of ethyl cellulose to n-hexane of 1 kg: 1L, adding 1/3 Kg (7 Kg) of total weight of ethyl cellulose into 7L of n-hexane solution, heating and refluxing in a water bath at 55 ℃, adding 10Kg of activated diatomite, 30Kg of sodium persulfate, 5Kg of acidic effervescent agent (citric acid) and 2.5Kg of alkaline effervescent agent sodium bicarbonate after the ethyl cellulose becomes transparent solution, stirring and dispersing to be uniform, then spraying the mixture on core material particles, and airing or drying to remove the n-hexane to obtain single-layer coated particles;
step 2-3, heating 10Kg of sliced paraffin to 80 ℃ to melt, adding 2Kg of ammonium chloride while stirring, spraying the mixture on the single-layer coated particles after uniform dispersion, and cooling to obtain double-layer coated particles;
and 2-4, according to the mass volume ratio of the ethyl cellulose to the n-hexane of 1 kg: 1L, adding the rest 14Kg of ethyl cellulose into 14L of n-hexane solution, heating and refluxing in a water bath at 55 ℃, adding the rest 10Kg of coated potassium ferrate and 2.5Kg of sodium bicarbonate after the ethyl cellulose becomes transparent solution, stirring and dispersing uniformly, then spraying the mixture on double-layer coated particles, and airing or drying to remove the n-hexane to obtain a compound B;
step three, mixing:
the mass ratio of the compound A to the compound B is 1: 3.97, weighing the compound A prepared in the step one and the compound B prepared in the step two, and uniformly mixing to obtain the wastewater treatment agent.
The using method comprises the following steps:
adding 1.49Kg of wastewater treatment agent into each liter of wastewater, adding 74.5Kg of the wastewater treatment agent prepared in the embodiment (after detection, 74.5Kg of the wastewater treatment agent contains 5Kg of potassium ferrate and 15Kg of sodium persulfate), adding 50L of wastewater, stirring and reacting for 24h (at the moment, potassium ferrate and sodium persulfate are completely consumed), and standing for 2-3 days; and (4) finishing.
Comparative example 1:
a wastewater treatment agent comprises the following components in parts by weight:
20Kg of iron-carbon pellets;
10Kg of citric acid.
The preparation method comprises the following steps:
weighing 20Kg of iron-carbon spherical particles and 10Kg of citric acid, and uniformly mixing to obtain the iron-carbon composite material.
The using method comprises the following steps:
adding 15Kg of the wastewater treatment agent prepared by the embodiment into 50L of wastewater uniformly according to 0.3Kg of wastewater treatment agent per liter of wastewater, stirring and reacting for 24 hours, and standing for 2-3 days.
Comparative example 2:
a wastewater treatment agent comprises the following components in parts by weight:
30Kg of sodium persulfate;
5Kg of ferrous sulfate.
The preparation method comprises the following steps:
weighing 30Kg of sodium persulfate and 9.14Kg of ferrous sulfate heptahydrate (5 Kg in terms of ferrous sulfate), and uniformly mixing.
The using method comprises the following steps:
firstly, adjusting the pH value of the wastewater to be acidic, then uniformly adding 19.5Kg of the wastewater treatment agent prepared in the embodiment (19.5 Kg of the sodium persulfate content in the wastewater treatment agent is 15Kg by detection) into 50L of wastewater according to 0.39Kg of wastewater treatment agent per liter of wastewater, stirring for reaction for 24h, and standing for 2-3 days.
Comparative example 3:
a wastewater treatment agent comprises the following components in parts by weight:
20Kg of coated potassium ferrate;
10Kg of quicklime;
the preparation method comprises the following steps:
weighing 20Kg of coated potassium ferrate and 10Kg of quick lime, and uniformly mixing to obtain the finished product.
The using method comprises the following steps:
according to the method, 15Kg of the wastewater treatment agent prepared by the embodiment (the content of potassium ferrate in the 15Kg of wastewater treatment agent is detected to be 5Kg) is uniformly put into 50L of wastewater according to 0.3Kg of wastewater treatment agent per liter of wastewater, stirred and reacted for 24h, and then kept stand for 2-3 days.
Comparative example 4
A wastewater treating agent is diatomite.
The using method comprises the following steps:
after the diatomite is activated, 5Kg of diatomite which corresponds to 0.1Kg of wastewater treatment agent per liter of wastewater is weighed and evenly put into 50L of wastewater, stirred for reaction for 24 hours, and then kept stand for 2-3 days.
Comparative example 5
A wastewater treatment agent comprises the following components in parts by weight:
the using method comprises the following steps:
step one, putting 10Kg of iron-carbon sphere particles and 5Kg of citric acid into 50L of wastewater according to 0.2Kg of iron-carbon sphere particles and 0.1Kg of citric acid corresponding to each liter of wastewater; stirring and reacting until Fe in the wastewater2+The concentration of (2) reaches 0.1Kg/L (at this time, the pH of the wastewater is detected to be acidic);
step two, uniformly adding 15Kg of sodium persulfate into each liter of wastewater corresponding to 0.3Kg of sodium persulfate, and stirring for reaction until the sodium persulfate in the wastewater is completely reacted;
step three, adding 10Kg of coated potassium ferrate and 5Kg of quick lime into each liter of wastewater corresponding to 0.2Kg of coated potassium ferrate and 0.1Kg of quick lime, and stirring for reaction until the potassium ferrate in the wastewater is completely reacted;
and step four, activating the diatomite, adding 5Kg of diatomite into the activated diatomite according to 0.1Kg of diatomite per liter of wastewater, stirring and reacting for 24 hours, and standing for 2-3 days.
Effect example 1
The waste water used in examples 1 to 3 and comparative examples 1 to 5 was the same batch waste water (original pH 8)Before the wastewater is treated, firstly, determining the Chemical Oxygen Demand (COD), ammonia nitrogen (NH 3-N), Total Phosphorus (TP), Total Nitrogen (TN) and Suspended Solids (SS) of the wastewater; then the wastewater is treated by the wastewater treatment agents prepared in the examples 1-3 and the comparative examples 1-5 and the method, and after the treatment is finished, the Chemical Oxygen Demand (COD) and ammonia Nitrogen (NH) of the treated wastewater are measured again3-N, total phosphorus TP, total nitrogen TN and suspended matter SS; and respectively calculating Chemical Oxygen Demand (COD) and ammonia Nitrogen (NH)3Removal rates of N, total phosphorus TP, total nitrogen TN and suspended matter SS; the results are shown in Table 1;
removal rate ═ (value measured before no treatment-value measured after treatment)/value measured before no treatment × 100%;
wherein, the determination of the COD value adopts a potassium dichromate method, and concretely refers to GB 11914-89;
ammonia nitrogen NH3The determination of-N is carried out by nano-reagent spectrophotometry, see HJ 535-2009;
the total phosphorus TP is determined by adopting an ammonium molybdate spectrophotometry, which is specifically referred to GB 11893-89;
the total nitrogen TN is measured by an alkaline potassium persulfate digestion ultraviolet spectrophotometry, which is specifically referred to GB 11894-89;
the suspended matter is measured by a gravimetric method, which is specifically referred to GB 11901-85;
from the data in the table, it can be seen that: comparative examples 1 to 4 independently adopt any wastewater treatment agent to treat wastewater, the effect is not as good as that of comparative example 5 adopting a plurality of modes to treat wastewater in sequence, however, comparative example 5 is obviously not as good as that of example 1, therefore, the conclusion can be drawn that: the wastewater is treated under alkaline conditions by adopting a compounding mode of sodium persulfate, potassium ferrate, diatomite and calcium oxide, and is used in sequence by matching with iron-carbon electrolysis, and compared with a comparative example 2 in which sodium persulfate is separately treated under acidic conditions, the wastewater treatment effect is obvious; however, in example 2, when the iron-containing carbon sphere particles encounter the calcium oxide-based substance, H is electrolytically generated from iron carbon+With OH-The neutralization reaction occurs, which theoretically reduces the treatment effect of the iron-carbon particles, while the ferrate decomposition encounters Fe produced by the iron-carbon2+In the meantime, potassium ferrate undergoes redox reaction with Fe2+, reducing the activity of acid hydrolysis of the high iron, and in addition, Fe2+Is oxidized into Fe3+Then, Fe3+The presence of (A) also promotes the decomposition of potassium ferrate, so that in theory the effect of the treatment of example 2 is significantly reduced, but it is achieved that example 2 demonstrates the effect on NH3The treatment effects of-N, TP and TN were comparable to example 1, while the treatment effects of COD and SS were superior to example 1, which may be a certain degree of synergy in iron-carbon sphere particles, sodium persulfate, and high-iron acid hydrolysis; in example 3, the composite B is layered to ensure that the synergistic effect of iron-carbon sphere particles, sodium persulfate and high-iron acidolysis is extremely exerted, and Fe is reduced2+And Fe3+The effect of potassium ferrate and calcium oxide on the iron carbon sphere particles, and thus, example 3 was the most effective in each of the examples and comparative examples.
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (5)
1. A wastewater treatment agent is characterized by consisting of a compound A and a compound B,
the compound A comprises the following components in parts by weight:
20 parts of iron-carbon spherical particles;
10 parts of citric acid;
the compound B comprises the following components in parts by weight:
the mass ratio of the compound A to the compound B is 1: 2-6;
the compound B also comprises 5 parts of carboxymethyl cellulose; 1 part of polyethylene glycol, 20 parts of ethyl cellulose, 5 parts of an acidic effervescent agent, 2.5 parts of an alkaline effervescent agent, 10 parts of slice paraffin, 2 parts of ammonium chloride and 0-2.5 parts of sodium bicarbonate;
the wastewater treatment agent is prepared by the following method:
the method comprises the following steps: preparation of Complex A
Weighing iron-carbon spherical particles and citric acid according to the weight parts, and uniformly mixing to obtain a compound A;
step two: preparation of Complex B
Step 2-1, weighing the raw materials according to the parts by weight, taking 1/2 of the total weight of lime and coated potassium ferrate, uniformly mixing the 1/2 with carboxymethyl cellulose and polyethylene glycol, and granulating to obtain core material particles;
step 2-2, 1/3 of the total weight of the ethyl cellulose is added into a normal hexane solution, heating and refluxing are carried out, after the ethyl cellulose becomes a transparent solution, activated diatomite, sodium persulfate, an acidic effervescent agent and an alkaline effervescent agent are added, stirring and dispersing are carried out until the mixture is uniform, then the mixture is sprayed on core material particles, and the normal hexane is removed by airing or drying, so as to obtain inner cladding layer particles;
step 2-3, heating the paraffin to 80 ℃ to melt, adding ammonium chloride while stirring, spraying the ammonium chloride on the inner cladding layer particles after uniform dispersion, and cooling to obtain paraffin-coated particles;
2-4, adding the rest ethyl cellulose into a normal hexane solution, heating and refluxing, adding the rest coated potassium ferrate after the ethyl cellulose becomes a transparent solution, then adding sodium bicarbonate, stirring and dispersing uniformly, then spraying the mixture on paraffin-coated particles, and airing or drying to remove the normal hexane to obtain a compound B;
step three, mixing:
and (3) weighing the compound A prepared in the step one and the compound B prepared in the step two according to the proportion, and uniformly mixing to obtain the wastewater treatment agent.
2. A wastewater treatment agent according to claim 1, wherein the lime is selected from one or two of quicklime and slaked lime;
the coating wall material of the coated potassium ferrate is one or two of paraffin and polyethylene wax.
3. A wastewater treatment agent according to claim 2, wherein the paraffin wax is selected from granular wax.
4. A wastewater treatment agent according to claim 1, wherein the acidic effervescent agent is selected from one or more of citric acid, tartaric acid, oxalic acid, maleic acid, fumaric acid, succinic acid and adipic acid;
the alkaline effervescent agent is selected from one or more of sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, calcium carbonate and ammonium bicarbonate.
5. A method of using the wastewater treatment agent of claim 1, comprising the steps of:
adding 1.3-1.8 Kg of wastewater treatment agent into each liter of wastewater, adding the wastewater treatment agent into the wastewater, stirring for reacting for 24 hours, and standing for 2-3 days; and (4) finishing.
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| CN109650514A (en) * | 2019-01-25 | 2019-04-19 | 山西盛汉沣源科技有限责任公司 | A kind of ammonia nitrogen in waste water, COD, total phosphorus efficiency remover and preparation method thereof |
| CN109850979A (en) * | 2019-02-25 | 2019-06-07 | 张芸 | A kind of formaldehyde waste water inorganic agent |
| CN110615518B (en) * | 2019-05-07 | 2022-05-24 | 中冶华天工程技术有限公司 | Fenton reaction ferrous iron slow release granule |
| CN110844977B (en) * | 2019-11-07 | 2022-12-02 | 中国石油天然气股份有限公司 | Treatment agent for reducing COD (chemical oxygen demand) of acidified flowback fluid and using method |
| CN111115776A (en) * | 2020-01-04 | 2020-05-08 | 山东得和明兴生物科技有限公司 | Novel environment-friendly sterilization deodorant and preparation method thereof |
| CN115159650A (en) * | 2022-07-12 | 2022-10-11 | 山东三加环保新材料有限公司 | Efficient sewage treatment agent and preparation process thereof |
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| CN104891719A (en) * | 2015-05-11 | 2015-09-09 | 东华大学 | Method for pre-treating organic industrial wastewater based on ferric-carbon micro-electrolysis activated persulfate |
| CN106957070A (en) * | 2017-03-20 | 2017-07-18 | 浙江清环保工程有限公司 | A kind of rapidly and efficiently ammonia nitrogen removal agent and its preparation method and application |
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| CN104891719A (en) * | 2015-05-11 | 2015-09-09 | 东华大学 | Method for pre-treating organic industrial wastewater based on ferric-carbon micro-electrolysis activated persulfate |
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