CN109231549B - Application of reverse osmosis concentrated water generated in papermaking industry in snow-melting agent - Google Patents
Application of reverse osmosis concentrated water generated in papermaking industry in snow-melting agent 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
- C09K3/185—Thawing materials
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
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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
- C02F2001/007—Processes including a sedimentation step
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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
Abstract
The invention relates to the technical field of drainage recycling in the papermaking industry, in particular to application of reverse osmosis concentrated water generated in the papermaking industry in a snow melting agent. The reverse osmosis concentrated water is used for preparing the snow melt agent after flocculation, oxidation, coprecipitation and activation. The method solves the post-treatment and application problems of the papermaking reverse osmosis concentrated water, the relative snow-melting and ice-melting capacity of the prepared snow-melting agent can reach more than 100 percent, the method is a good reutilization way, simultaneously solves the environmental problem, achieves two purposes by one, and has good industrial utilization value; the process for treating the papermaking reverse osmosis concentrated water is simple in process flow, and the used chemicals are clean and environment-friendly.
Description
Technical Field
The invention relates to the technical field of drainage recycling in the papermaking industry, in particular to application of reverse osmosis concentrated water generated in the papermaking industry in a snow melting agent.
Background
In recent years, the national requirements on environmental protection are higher and higher, the requirements on the water discharge of per ton products of paper making enterprises are strict, even zero discharge is to be achieved, and the improvement of the water reuse rate becomes a current research hotspot. The index of the reuse water of the general wastewater treatment method can not reach the water standard of the paper making industry, while the return water after the ultrafiltration-reverse osmosis double-membrane method treatment can completely reach the water standard of the paper making industry, more and more paper making enterprises adopt the double-membrane method to treat the paper making wastewater to achieve the purpose of saving clean water, although the double-membrane return water can completely replace the clean water to be used in each working section of the paper making production, the treatment of the concentrated water after the double-membrane treatment becomes a difficult point, especially the treatment of the reverse osmosis concentrated water.
The papermaking reverse osmosis concentrated water is rich in biodegradable organic matters, the concentration of CODcr (about 1000mg/L) of the papermaking reverse osmosis concentrated water is higher than that of CODcr (100-300mg/L) of other industrial concentrated water, sulfate ions, chloride ions, calcium ions, sodium ions, aluminum ions, iron ions, magnesium ions and the like are also contained, the reverse osmosis concentrated water with high CODcr and high salinity is extremely difficult to treat, and the technologies of backflow, sea drainage, deep well injection, spray irrigation, distillation concentration and the like are mainly adopted at home and abroad at present. The backflow easily blocks the ultrafiltration membrane and the reverse osmosis membrane, so that the service life of the membrane is shortened; distillation concentration faces difficulty in preparation and selection of the super-hydrophobic membrane; sea drainage and deep well injection can further pollute the environment; sprinkling irrigation can have an impact on plant growth and soil characteristics. Some researchers try to recover the reverse osmosis concentrated water partially by forward osmosis (forward osmosis) and membrane distillation (membrane distillation) technologies, but the application prospect is not good due to high energy consumption or high requirement on membrane quality. At present, the problems of high CODcr and high salinity removal of reverse osmosis concentrated water for papermaking are not always discussed into a better technical scheme.
CN108395876A discloses a composite snow melt agent and a preparation method thereof, wherein the composite snow melt agent comprises the following components in percentage by mass: 78-93 parts of composite salt, 12-23 parts of corrosion inhibitor and 2-4 parts of plant nutrient; the compound salt is extracted from reverse osmosis strong brine. The preparation method of the composite snow-melting agent comprises the following steps: (1) concentrating the reverse osmosis strong brine to be close to a saturated state; (2) carrying out spray drying on the concentrated brine obtained in the step (1) to obtain a compound salt; (3) adding corrosion inhibitor and plant nutrient into the composite salt. The invention realizes the efficient and economic resource utilization of the reverse osmosis strong brine, and the composite snow-melting agent can quickly and effectively melt ice and snow, greatly reduces the metal corrosion of the common snow-melting agent on the road surface and the pollution to the greening vegetation environment, has simple and feasible production process, and has the advantages of changing waste into valuables, protecting environment and saving energy. However, the process is only suitable for reverse osmosis strong brine with low CODcr content, and is not suitable for reverse osmosis strong brine with high CODcr content produced in the papermaking industry because the CODcr content is high, namely the organic matter content is high, the high organic matter content has great influence on the performance of the snow-melting agent, the snow-melting effect is poor, and the environmental pollution is serious.
Disclosure of Invention
In order to solve the problems of high CODcr and high salinity removal in the post-treatment and repeated use of reverse osmosis water generated by papermaking in the prior art, the application discloses the application of reverse osmosis concentrated water in a snow melting agent.
The invention is realized by the following measures:
the application of reverse osmosis concentrated water produced in the papermaking industry in a snow-melting agent after flocculation, oxidation, coprecipitation and activation is provided, wherein the reverse osmosis concentrated water is high-concentration wastewater obtained after papermaking wastewater is treated by a reverse osmosis membrane.
In the application, the flocculating agent used in the flocculation is polyaluminium chloride with the content of 26% aluminum oxide, the polyaluminium chloride with the content of 30% aluminum oxide and the polyaluminium chloride with the content of 35% aluminum oxide according to the mass ratio of 1: 1: 1, the dosage of the compound formed by mixing is 1-6 times, preferably 4 times of the mass of CODcr in the reverse osmosis concentrated water; the coagulant aid used in the flocculation is APAM with the molecular weight of 800 ten thousand, 1000 ten thousand, 1200 ten thousand and 1800 ten thousand according to the mass ratio of 1: 1: 1: 1 in an amount of 0.01 to 1.0 times, preferably 0.05 times, the mass of CODcr in the reverse osmosis concentrated water.
The application is that the oxidizing agent used in the oxidation is composed of potassium persulfate, sodium persulfate, ammonium persulfate and sodium bisulfite according to the mass ratio of 1: 1: 1: 1.5, the dosage of the mixture is 0.1 to 10 times, preferably 5 times of the mass of CODcr in the original reverse osmosis concentrated water.
In the application, the coprecipitator used in the coprecipitation is prepared from calcium oxide and sodium metaaluminate according to the mass ratio of 3: 1, the dosage of the composition is 0.1 to 10 times, preferably 5 times of the mass of CODcr in the original reverse osmosis concentrated water.
In the application, the activator is prepared from glacial acetic acid, nitric acid, hydrochloric acid, surfactant dodecyl glucoside, defoaming agent polydimethylsiloxane and corrosion inhibitor according to the mass ratio of 1: 1: 1: 0.00005: 0.00005: 0.0005, the dosage of which is 0.01-1.0 time, preferably 0.2 time of the absolute dry precipitate obtained in the coprecipitation, wherein the corrosion inhibitor is sodium gluconate and sodium borate according to the mass ratio of 1: 1.
The application comprises the steps of adding a flocculating agent in a flocculation stage, wherein the stirring speed is 500 rpm, T =30 +/-2 ℃ for 2-60 min, preferably T =30 +/-2 ℃, the heat preservation time is 30 min, the stirring speed is 350 rpm, then adding a coagulant aid, the stirring speed is 20-100 rpm, T =30 +/-2 ℃, the stirring speed is 2-30 min, preferably the stirring speed is 20-100 rpm, T =30 +/-2 ℃, the heat preservation time is 30 min, the stirring speed is 80 rpm, and filtering flocculated reverse osmosis concentrated water by using filter paper to obtain a filtrate.
The application and the oxidation stage process are as follows: adding oxidant into the filtrate obtained in the flocculation stage, wherein the stirring speed is 250-500 rpm, T =30 +/-2 ℃, the pH =3.0 +/-1.0, the time is 2-120 min, preferably the pH =3.0 +/-1.0, the T =30 +/-2 ℃, the heat preservation time is 60 min, and the stirring speed is 350 rpm.
The application comprises the steps of adding a coprecipitator after oxidation of reverse osmosis concentrated water, stirring at the speed of 250-500 rpm and at the temperature of T =30 +/-2 ℃ for 30-120 min, preferably at the temperature of T =30 +/-2 ℃, keeping the temperature for 60 min, filtering at the speed of 350 rpm, and drying the precipitate to be absolute dry.
The application comprises the steps of taking an absolute dry precipitate after coprecipitation, adding an activating agent, controlling the concentration of total solid matters to be 30%, controlling the stirring speed to be 250-500 rpm, controlling the temperature to be T =40 +/-2 ℃ and controlling the time to be 30-120 min, preferably controlling the temperature to be T =40 +/-2 ℃, keeping the temperature for 60 min, controlling the stirring speed to be 350 rpm, and filtering to obtain a filtrate for preparing the snow-melting agent.
The relative snow and ice melting capacity of the snow melting agent is more than 100 percent.
The technical scheme provided by the invention is as follows: the method comprises the steps of firstly, removing organic matters in a part of colloid range in the concentrated water by means of electric neutralization destabilization and adsorption bridging of a flocculating agent and a coagulant aid, then adding a high-grade oxidation assistant, further oxidizing and degrading micromolecule organic matters in the concentrated water by utilizing generated free radicals, simultaneously adding a coprecipitator to precipitate and adsorb the organic matters and inorganic matters in the concentrated water, and activating the coprecipitate by using an activating agent to prepare the snow-melting agent. After the treatment by the process, the relative snow and ice melting capacity of the prepared snow melting agent can reach more than 100 percent.
The determination of the snow-melting and ice-melting capability of the snow-melting agent is referred to the GB/T23851-
The method for measuring the snow melting and deicing capabilities of the snow melting agent comprises the following specific steps:
a) taking two 50mL beakers with the same diameter and height, adding 15.00 mL of water, and placing the beakers in a cryostat with the temperature of minus 15 +/-1 ℃ for freezing for 3 hours to prepare ice blocks for later use.
b) Respectively transferring 25.00 mL of a snow melt agent test solution (29 percent by mass) and a calcium chloride dihydrate standard solution (29 percent) into two 50mL beakers, placing the beakers into a cryostat at minus 15 +/-1 ℃ and keeping the beakers for 3 hours for later use.
c) The beaker with the ice blocks was taken out of the cryostat, water and ice on the outer wall were wiped dry, and the weight was quickly weighed at room temperature to an accuracy of 0.1 g.
d) Taking out the snow-melting agent test solution in the low-temperature incubator, quickly pouring the snow-melting agent test solution into a beaker filled with ice blocks, and then putting the snow-melting agent test solution back into the low-temperature incubator at minus 15 +/-1 ℃. After 0.5h the beaker was removed and the liquid immediately poured out and the beaker and remaining ice were quickly weighed at room temperature.
e) The operation steps of the calcium chloride dihydrate solution are the same as those of the snow melt agent test solution.
Relative snow and ice melting capacity of w1The calculation is performed according to the following formula:
w1=[(m0-m1)/(m2-m3)]×100%
wherein: m is0-the value of the mass of the beaker and the ice mass in grams (g) without the addition of the snow-melting agent test solution;
m1-the mass values of the beaker and the ice mass in grams (g) after pouring out the snow-melting agent test solution and the melted ice;
m2beaker and ice mass without addition of calcium chloride dihydrate solutionThe amount is given in grams (g);
m3-the mass of the beaker and the ice after pouring out the calcium chloride dihydrate solution and the melted ice, in grams (g).
In conclusion, the process for treating the papermaking reverse osmosis concentrated water by adopting the process disclosed by the invention is simple in process flow, and the used chemicals are clean and environment-friendly. The invention mainly flocculates and degrades partial organic matters in the concentrated water by a flocculating agent and a high-grade oxidant, then further precipitates and adsorbs the organic matters and inorganic matters in the concentrated water by a coprecipitator, and an activating agent is used for activating the coprecipitate, thereby obtaining the snow melting agent with high snow and ice melting capability.
The invention has the beneficial effects that:
(1) the method solves the post-treatment and application problems of the papermaking reverse osmosis concentrated water, the relative snow-melting and ice-melting capacity of the prepared snow-melting agent can reach more than 100 percent, the method is a good reutilization way, simultaneously solves the environmental problem, achieves two purposes by one, and has good industrial utilization value;
(2) the process for treating the papermaking reverse osmosis concentrated water is simple in process flow, and the used chemicals are clean and environment-friendly.
Drawings
FIG. 1 is a process flow chart of preparing a snow-melting agent with high snow-melting and ice-melting capability by papermaking reverse osmosis concentrated water.
Detailed Description
For better understanding of the present invention, the following examples are given in conjunction with the accompanying drawings, but the scope of the present invention is not limited to the scope of the present examples.
The following examples were carried out using the following various treating agents:
flocculating agents used in the flocculation are polyaluminium chloride with the content of 26% aluminum oxide, polyaluminium chloride with the content of 30% aluminum oxide and polyaluminium chloride with the content of 35% aluminum oxide according to the mass ratio of 1: 1: 1, the dosage of the compound formed by mixing is 1-6 times, preferably 4 times of the mass of CODcr in the reverse osmosis concentrated water; the coagulant aid used in the flocculation is APAM with the molecular weight of 800 ten thousand, 1000 ten thousand, 1200 ten thousand and 1800 ten thousand according to the mass ratio of 1: 1: 1: 1 in an amount of 0.01 to 1.0 times, preferably 0.05 times, the mass of CODcr in the reverse osmosis concentrated water.
The oxidizing agent used in the oxidation is prepared from potassium persulfate, sodium persulfate, ammonium persulfate and sodium bisulfite according to the mass ratio of 1: 1: 1: 1.5, the dosage of the mixture is 0.1 to 10 times, preferably 5 times of the mass of CODcr in the original reverse osmosis concentrated water.
The coprecipitator used in the coprecipitation is prepared from calcium oxide and sodium metaaluminate according to the mass ratio of 3: 1, the dosage of the composition is 0.1 to 10 times, preferably 5 times of the mass of CODcr in the original reverse osmosis concentrated water.
The activator is prepared from glacial acetic acid, nitric acid, hydrochloric acid, surfactant dodecyl glucoside, defoamer polydimethylsiloxane and corrosion inhibitor according to the mass ratio of 1: 1: 1: 0.00005: 0.00005: 0.0005, the dosage of which is 0.01-1.0 time, preferably 0.2 time of the absolute dry precipitate obtained in the coprecipitation, wherein the corrosion inhibitor is sodium gluconate and sodium borate according to the mass ratio of 1: 1.
Example 1:
the process of the invention is adopted to treat the papermaking reverse osmosis concentrated water with high CODcr content (1355 mg/L), 0.9485
The method comprises the following steps: adding 700mL of papermaking reverse osmosis concentrated water into a 1000mL three-mouth bottle, adding 3.79g of flocculant (4 times of CODcr), T =30 +/-2 ℃, keeping the temperature for 30 minutes, stirring at 350 rpm, adding 47mg of coagulant aid (0.05 times of CODcr), stirring at 20-100 rpm, T =30 +/-2 ℃, keeping the temperature for 30 minutes, stirring at 80 rpm, quantitatively filtering the flocculated reverse osmosis concentrated water by using filter paper at a medium speed, and diluting the filtrate to 700mL by using distilled water for later use.
Step two: adding 700mL of filtrate obtained in the first step into a 1000mL three-necked bottle, adding 4.74g of a higher oxidant (5 times of CODcr), adding 4.74g of a coprecipitator (5 times of CODcr) immediately after the higher oxidation, adding T =30 +/-2 ℃, keeping the temperature for 60 minutes, stirring at 350 rpm, quantitatively filtering at medium speed through filter paper after the reaction, and drying the precipitate until the precipitate is completely dry for later use.
Step three: 50g of the dried coprecipitate is weighed and added into a 250mL three-necked flask, 10g of an activating agent (0.2 time of the absolute dry mass of the coprecipitate) is added, T =40 +/-2 ℃, the heat preservation time is 60 minutes, and the stirring speed is 350 rpm. The snow-melting agent prepared by the above procedure was found to have a relative snow-melting and ice-melting capacity of 125%. The process flow diagram is shown in figure 1.
Example 2:
the process of the invention is adopted to treat the papermaking reverse osmosis concentrated water with low CODcr content (920 mg/L),
the method comprises the following steps: adding 700mL of papermaking reverse osmosis concentrated water into a 1000mL three-mouth bottle, adding 2.58g of flocculant (4 times of CODcr), T =30 +/-2 ℃, keeping the temperature for 30 minutes, stirring at 350 rpm, adding 32mg of coagulant aid (0.05 times of CODcr), stirring at 20-100 rpm, T =30 +/-2 ℃, keeping the temperature for 30 minutes, stirring at 80 rpm, quantitatively filtering the flocculated reverse osmosis concentrated water by using filter paper at a medium speed, and diluting the filtrate to 700mL by using distilled water for later use.
Step two: adding 700mL of filtrate obtained in the first step into a 1000mL three-necked bottle, adding 3.22g of higher oxidant (5 times of CODcr), adding 3.0 g of coprecipitate (5 times of CODcr) immediately after the higher oxidation, adding 3.22g of coprecipitate (5 times of CODcr) immediately after the higher oxidation, adding T =30 +/-2 ℃, keeping the temperature for 60 minutes, stirring at 350 rpm, quantitatively filtering at medium speed through filter paper after the reaction, and drying the precipitate until the precipitate is completely dry for later use.
Step three: 50g of the dried coprecipitate is weighed and added into a 250mL three-necked flask, 10g of an activating agent (0.2 time of the absolute dry mass of the coprecipitate) is added, T =40 +/-2 ℃, the heat preservation time is 60 minutes, and the stirring speed is 350 rpm. The snow-melting agent prepared by the above procedure was found to have a relative snow-melting and ice-melting capacity of 130%.
Example 3:
compared with example 1, 0.5g of activating agent is added, T =40 +/-2 ℃, the holding time is 60 minutes, the stirring speed is 350 rpm, and the rest is the same as example 1. The prepared snow-melting agent measured a relative snow-melting and ice-melting ability of 105%.
Example 4:
compared with example 1, the same operation as example 1 was repeated except that 50g of the activator was added, T = 40. + -. 2 ℃, the incubation time was 60 minutes, and the stirring speed was 350 rpm. The prepared snow-melting agent has a relative snow-melting and ice-melting capacity of 116 percent.
Example 5:
compared with example 2, 0.5g of activating agent is added, T =40 +/-2 ℃, the holding time is 60 minutes, the stirring speed is 350 rpm, and the rest is the same as that of example 2. The prepared snow-melting agent has the relative snow-melting and ice-melting capacity of 108 percent.
Example 6:
compared with example 2, the method is the same as example 2 except that 50g of activating agent is added, T =40 +/-2 ℃, the heat preservation time is 60 minutes, and the stirring speed is 350 rpm. The prepared snow-melting agent has the relative snow-melting and ice-melting capacity of 120 percent.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the embodiments, and any other changes, modifications, combinations, substitutions and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (8)
1. The application of reverse osmosis concentrated water produced in the paper making industry in a snow-melting agent after flocculation, oxidation, coprecipitation and activation;
the reverse osmosis concentrated water is paper-making wastewater treated by a reverse osmosis membraneThe high-concentration waste water obtained after the treatment(ii) a Filtering the flocculated reverse osmosis concentrated water by using filter paper to obtain filtrate;
adding an oxidant into the filtrate obtained in the flocculation stage for oxidation, adding a coprecipitator after oxidation, wherein the coprecipitator used in coprecipitation consists of calcium oxide and sodium metaaluminate, specifically, adding an activating agent into the absolutely dry precipitate after coprecipitation for reaction, and filtering after reaction to obtain the filtrate for preparing the snow-melting agent;
the activator is prepared from glacial acetic acid, nitric acid, hydrochloric acid, surfactant dodecyl glucoside, defoamer polydimethylsiloxane and corrosion inhibitor according to the mass ratio of 1: 1: 1: 0.00005: 0.00005: 0.0005, wherein the dosage of the corrosion inhibitor is 0.01-1.0 time of the absolute dry precipitate obtained in the coprecipitation, and the corrosion inhibitor is sodium gluconate and sodium borate according to the mass ratio of 1: 1, preparing a composition;
flocculating agents used in the flocculation are polyaluminium chloride with the alumina content of 26%, polyaluminium chloride with the alumina content of 30% and polyaluminium chloride with the alumina content of 35% according to the mass ratio of 1: 1: 1, the dosage of the compound formed by mixing is 1-6 times of the mass of CODcr in the reverse osmosis concentrated water; the coagulant aid used in the flocculation is APAM with the molecular weight of 800 ten thousand, 1000 ten thousand, 1200 ten thousand and 1800 ten thousand according to the mass ratio of 1: 1: 1: 1, the dosage of the mixture obtained by mixing is 0.01 to 1.0 time of the mass of CODcr in the reverse osmosis concentrated water.
2. The use according to claim 1, characterized in that the oxidizing agent used in the oxidation is selected from potassium persulfate, sodium persulfate, ammonium persulfate and sodium bisulfite in a mass ratio of 1: 1: 1: 1.5, the dosage of the mixture is 0.1 to 10 times of the mass of CODcr in the original reverse osmosis concentrated water.
3. The use according to claim 1, characterized in that the mass ratio of calcium oxide to sodium metaaluminate in the coprecipitate is 3: 1, the dosage is 0.1-10 times of the mass of CODcr in the original reverse osmosis concentrated water.
4. The application of claim 1, wherein in the flocculation stage, the flocculating agent is added firstly at a stirring speed of 250-500 rpm, T =30 ± 2 ℃ for 2-60 min, and then the coagulant aid is added at a stirring speed of 20-100 rpm, T =30 ± 2 ℃ for 2-30 min, and the flocculated reverse osmosis concentrated water is filtered by filter paper to obtain the filtrate.
5. The use according to claim 1, characterized in that the oxidation stage process is: adding oxidant into the filtrate obtained in the flocculation stage, wherein the stirring speed is 250-500 rpm, T =30 +/-2 ℃, the pH =3.0 +/-1.0, and the time is 2-120 min.
6. The application of claim 1, wherein the coprecipitator is added after the reverse osmosis concentrated water is oxidized, the stirring speed is 250-500 rpm, T =30 ± 2 ℃, the time is 30-120 min, and the solution is filtered, precipitated and dried to be absolutely dry.
7. The application as claimed in claim 1, wherein the activation agent is added into the absolute dry precipitate after coprecipitation, the total solid concentration is controlled to be 30%, the stirring speed is 250-500 rpm, T =40 ± 2 ℃, the time is 30-120 min, and the filtrate is obtained by filtration and used for preparing the snow-melting agent.
8. Use according to claim 1, characterized in that the snow-melting agent has a relative snow-melting and ice-melting capacity of more than 100%.
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| CN201811148842.6A CN109231549B (en) | 2018-09-29 | 2018-09-29 | Application of reverse osmosis concentrated water generated in papermaking industry in snow-melting agent |
| PCT/CN2019/086822 WO2020062888A1 (en) | 2018-09-29 | 2019-05-14 | Application of reverse osmosis concentrated water produced in papermaking industry in snow-melting agent |
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| CN114230081B (en) * | 2021-12-24 | 2024-04-16 | 华能辛店发电有限公司 | Method for preparing snow-melting agent and for deicing fan blades by using desulfurization wastewater |
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| CN109231549A (en) | 2019-01-18 |
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