CN108996643B - Dephosphorization flocculant for urban sewage treatment and preparation method and application thereof - Google Patents
Dephosphorization flocculant for urban sewage treatment and preparation method and application thereof Download PDFInfo
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- CN108996643B CN108996643B CN201811045993.9A CN201811045993A CN108996643B CN 108996643 B CN108996643 B CN 108996643B CN 201811045993 A CN201811045993 A CN 201811045993A CN 108996643 B CN108996643 B CN 108996643B
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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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
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Abstract
The invention discloses a dephosphorizing flocculant for urban sewage treatment and a preparation method and application thereof, 40-80 parts of ferric sulfate, 20-40 parts of chitosan, 15-30 parts of sodium silicate, 25-35 parts of ferrous sulfate, 24-36 parts of manganese dioxide, 14-26 parts of ferric oxide, 13-25 parts of hydrochloric acid solution, 14-18 parts of an initiator and 15-19 parts of a coagulant aid. The invention also discloses a preparation method of the dephosphorizing flocculant for urban sewage treatment. The method solves the problem of low-concentration phosphorus-containing municipal sewage treatment, overcomes the defects of the existing phosphorus removal flocculating agent, has the advantages of good product stability, small using amount, high flocculation speed, good flocculation effect, short settling time, high treatment efficiency, wide application range and small sludge production amount, can play a role in phosphorus removal and dephosphorization, and has the advantages of low treatment cost and simple process.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a dephosphorizing flocculant for urban sewage treatment and a preparation method and application thereof.
Background
With the development of cities, the discharge amount of urban sewage reaches the non-treatment and non-treatment step. Particularly, phosphorus in the sewage mainly comes from urban sewage such as detergents, excrement, phosphorization and the like, and the form of the phosphorus mainly comprises orthophosphate, polyphosphate and organic phosphorus, wherein the orthophosphate and the polyphosphate account for the majority, the phosphorus can be converted between the organic phosphorus and inorganic phosphorus, and between soluble phosphorus and insoluble phosphorus, but the valence state cannot be changed. Generally, water is purified to remove or reduce phosphorus components, and then the clear liquid is recycled. The results of this treatment are not good and are indeed mainly determined by the flocculating agent used to purify the water.
Nitrogen and phosphorus are main elements causing water eutrophication, wherein the phosphorus has more special contribution. With the development of society and the continuous improvement of living standard of people, the requirement on urban sewage treatment is higher and higher, and the indexes of phosphorus removal and nitrogen removal for sewage treatment are stricter and stricter. In order to avoid discharging a large amount of phosphorus-containing domestic sewage and industrial urban sewage into rivers and lakes, the load of nutrient substances of the water body is increased, so that the abnormal propagation of algae and aquatic plants in the water body, namely the eutrophication of the water body, is caused. Therefore, phosphorus control and treatment of phosphorus-containing municipal sewage are currently urgent issues.
At present, the sewage dephosphorization technology mainly comprises chemical dephosphorization and biological dephosphorization. The biological phosphorus removal has poor stability and low phosphorus removal rate, and the general biological phosphorus removal only has about 30 to 40 percent of phosphorus removal, so that pollutants such as phosphate radical and the like are difficult to completely remove. Chemical phosphorus removal, large medicament dosage, high cost, large amount of generated chemical sludge and poor treatment effect on low-concentration phosphorus-containing urban sewage, and the treated urban sewage can be discharged only by combining with other processes for deeply treating the urban sewage.
Therefore, the dephosphorization and dephosphorization flocculant can be needed, the defects of the existing dephosphorization flocculant can be overcome, the consumption is small, the flocculation speed is high, and the cost is low, so that the use requirement is met.
Disclosure of Invention
The invention aims to provide a dephosphorizing flocculant for urban sewage treatment and a preparation method and application thereof, wherein the dephosphorizing flocculant is low in medicament cost, small in adding amount, short in time consumption, solid in precipitate and good in dephosphorizing effect, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the dephosphorizing flocculant for treating the urban sewage comprises the following raw materials in parts by weight: 40-80 parts of ferric sulfate, 20-40 parts of chitosan, 15-30 parts of sodium silicate, 25-35 parts of ferrous sulfate, 24-36 parts of manganese dioxide, 14-26 parts of ferric oxide, 13-25 parts of hydrochloric acid solution, 14-18 parts of an initiator and 15-19 parts of a coagulant aid.
As a further scheme of the invention: the feed comprises the following raw materials in parts by weight: 55-65 parts of ferric sulfate, 25-35 parts of chitosan, 20-25 parts of sodium silicate, 28-32 parts of ferrous sulfate, 28-32 parts of manganese dioxide, 18-22 parts of ferric oxide, 17-21 parts of hydrochloric acid solution, 15-17 parts of an initiator and 16-18 parts of a coagulant aid.
As a still further scheme of the invention: the feed comprises the following raw materials in parts by weight: 60 parts of ferric sulfate, 30 parts of chitosan, 23 parts of sodium silicate, 30 parts of ferrous sulfate, 30 parts of manganese dioxide, 20 parts of ferric oxide, 18 parts of hydrochloric acid solution, 16 parts of initiator and 17 parts of coagulant aid.
As a still further scheme of the invention: the purity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide and the ferric oxide is more than 95%, and the granularity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide, the ferric oxide and the chitosan is 150-400 meshes.
As a still further scheme of the invention: the chitosan is quaternized chitosan or carboxymethylated chitosan.
As a still further scheme of the invention: the initiator is prepared from potassium persulfate and sodium sulfite according to the molar ratio of 1: 1.
As a still further scheme of the invention: the hydrochloric acid solution is hydrochloric acid with the concentration of 12% -35%.
The preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 40-80 parts of ferric sulfate (light yellow solid particles), 28-32 parts of manganese dioxide (black orthorhombic crystals) and 18-22 parts of ferric oxide (red brown powder), and crushing the raw materials into particles of 10-30 mm by using a crusher respectively for later use;
2) adding 40-80 parts of crushed ferric sulfate and 28-32 parts of crushed ferrous sulfate into water according to the total proportion of 1:2, heating the mixture to 80-90 ℃, and stirring the mixture for 20-30min to slowly dissolve the ferric sulfate and the ferrous sulfate, wherein the liquid is a red brown viscous liquid to prepare a solution A for later use; when ferrous sulfate exists in water, ferric sulfate is dissolved quickly, so that the dissolving time is saved;
3) taking the following components in parts by weight: 25-35 parts of chitosan, 13-25 parts of hydrochloric acid solution, 1/5 parts of total amount, water is added for dilution to 1% hydrochloric acid, then the chitosan is slowly added into the 1% hydrochloric acid, and the mixture is stirred for 5-10min to prepare a chitosan mixed solution B for later use;
4) taking the following components in parts by weight: 20-25 parts of sodium silicate (colorless, light yellow or grey transparent viscous liquid) are dissolved in the solution A obtained in the step 2), and the solution is stirred for 5-10min until the solution is uniform, so that a composite solution C is prepared, and the composite solution C is alkaline for later use;
5) taking the following components in parts by weight: 18-22 parts of ferric oxide and 28-32 parts of manganese dioxide are added into 4/5 solution of hydrochloric acid solution 13-25 parts of total weight, heated to 30-45 ℃ and stirred for 30-40min to prepare mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 1-2 hours, heating to 75-85 ℃, sequentially adding 15-17 parts of weighed initiator and 16-18 parts of weighed coagulant aid, uniformly mixing and reacting for 8-12 hours;
7) and (3) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying, and bagging for later use to obtain the dephosphorizing flocculant.
As a still further scheme of the invention: and 7), drying for 2-3 hours at the drying temperature of 120-150 ℃ under hot air.
The dephosphorizing flocculant for treating the urban sewage is used for treating the sewage, wherein the sewage treatment is carried out on water discharged by urban domestic sewage or phosphorus-containing laundry urban sewage, a stock solution is diluted to a corresponding concentration and then added (solid is added with water firstly, diluted and stirred evenly and then added) according to the property of a medicament and the degree of water pollution during the urban sewage treatment, and a mode of directly adding the raw medicament can be selected for treating the urban sewage with serious pollution. The adding dosage is mainly determined by the water pollution degree, the adding point and the lab scale condition, and is usually 100-200 mg added into each liter of urban sewage.
Compared with the prior art, the invention has the beneficial effects that:
the preparation method and the dephosphorization flocculant for treating the municipal sewage, which are produced by the application of the preparation method, solve the problem of low-concentration phosphorus-containing municipal sewage treatment, make up for the defects of the existing dephosphorization flocculant, and have the advantages of good product stability, small using amount, high flocculation speed, good flocculation effect, short settling time, high treatment efficiency, wide application range, small sludge production amount, capability of simultaneously playing the roles of dephosphorization and dephosphorization, low treatment cost and simple process.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
Example 1
The dephosphorizing flocculant for treating the urban sewage comprises the following raw materials in parts by weight: 40 parts of ferric sulfate, 20 parts of chitosan, 15 parts of sodium silicate, 25 parts of ferrous sulfate, 24 parts of manganese dioxide, 14 parts of ferric oxide, 13 parts of hydrochloric acid solution, 14 parts of initiator and 15 parts of coagulant aid.
The purity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide and the ferric oxide is more than 95%, and the granularity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide, the ferric oxide and the chitosan is 150 meshes.
The chitosan is quaternized chitosan.
The initiator is prepared from potassium persulfate and sodium sulfite according to a molar ratio of 1: 1.
The hydrochloric acid solution is hydrochloric acid with the concentration of 12%.
The preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 40 parts of ferric sulfate (light yellow solid particles), 24 parts of manganese dioxide (black orthorhombic crystals) and 14 parts of ferric oxide (reddish brown powder), and crushing the raw materials into particles of 10-30 mm by using a crusher respectively for later use;
2) adding water into 40 parts of crushed ferric sulfate and 25 parts of crushed ferrous sulfate according to the total proportion of 1:2, heating to 90 ℃, and stirring for 20min to slowly dissolve the ferric sulfate and the ferrous sulfate, wherein the liquid is a red brown viscous liquid to prepare a solution A for later use; when ferrous sulfate exists in water, ferric sulfate is dissolved quickly, so that the dissolving time is saved;
3) taking the following components in parts by weight: 3 parts of chitosan, 13 parts of hydrochloric acid solution, 1/5 parts of total amount of hydrochloric acid solution and water are added for dilution to 1% hydrochloric acid, then the chitosan is slowly added into the 1% hydrochloric acid, and the mixture is stirred for 5min to prepare a chitosan mixed solution B for standby;
4) taking the following components in parts by weight: 15 parts of sodium silicate is dissolved in the solution A in the step 2), and the solution is stirred for 10min to be uniform, so as to prepare a composite solution C which is alkaline for later use;
5) taking the following components in parts by weight: adding 14 parts of ferric oxide and 24 parts of manganese dioxide into 4/5 parts of hydrochloric acid solution in total amount, heating to 30 ℃, and stirring for 35min to obtain a mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 2 hours, heating to 80 ℃, sequentially adding 14 parts of weighed initiator and 15 parts of weighed coagulant aid, uniformly mixing and reacting for 10 hours;
7) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying at the temperature of 120 ℃ for 2 hours in hot air, and bagging for later use to obtain the dephosphorizing flocculant.
The dephosphorizing flocculant for treating the urban sewage is applied to the sewage treatment, wherein the sewage treatment is carried out on water discharged by urban domestic sewage or phosphorus-containing laundry urban sewage, and 150mg of the dephosphorizing flocculant is added to each liter of the urban sewage.
Example 2
The dephosphorizing flocculant for treating the urban sewage comprises the following raw materials in parts by weight: 80 parts of ferric sulfate, 40 parts of chitosan, 30 parts of sodium silicate, 35 parts of ferrous sulfate, 36 parts of manganese dioxide, 26 parts of ferric oxide, 25 parts of hydrochloric acid solution, 18 parts of initiator and 19 parts of coagulant aid.
The purity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide and the ferric oxide is more than 95%, and the granularity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide, the ferric oxide and the chitosan is 300 meshes.
The chitosan is carboxymethylated chitosan.
The initiator is prepared from potassium persulfate and sodium sulfite according to a molar ratio of 1: 1.
The hydrochloric acid solution is 15% hydrochloric acid.
The preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 80 parts of ferric sulfate (light yellow solid particles), 36 parts of manganese dioxide (black orthorhombic crystals) and 26 parts of ferric oxide (reddish brown powder), and crushing the raw materials into particles of 20mm by using a crusher respectively for later use;
2) adding water into 80 parts of crushed ferric sulfate and 35 parts of crushed ferrous sulfate according to the total proportion of 1:2, heating to 90 ℃, and stirring for 30min to slowly dissolve the ferric sulfate and the ferrous sulfate, wherein the liquid is a red brown viscous liquid to prepare a solution A for later use; when ferrous sulfate exists in water, ferric sulfate is dissolved quickly, so that the dissolving time is saved;
3) taking the following components in parts by weight: 40 parts of chitosan, 25 parts of hydrochloric acid solution, 1/5, water and 1% hydrochloric acid, slowly adding the chitosan into the 1% hydrochloric acid, and stirring for 7min to prepare a chitosan mixed solution B for later use;
4) taking the following components in parts by weight: 30 parts of sodium silicate is dissolved in the solution A in the step 2), and the solution is stirred for 10min to be uniform, so as to prepare a composite solution C which is alkaline for later use;
5) taking the following components in parts by weight: 26 parts of ferric oxide and 36 parts of manganese dioxide are added into 4/5 solution of 25 parts of hydrochloric acid solution, heated to 40 ℃ and stirred for 35min to prepare mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 2 hours, heating to 80 ℃, sequentially adding 18 parts of weighed initiator and 19 parts of weighed coagulant aid, uniformly mixing and reacting for 10 hours;
7) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying at 130 ℃ for 3 hours in hot air, and bagging for later use to obtain the dephosphorizing flocculant.
The dephosphorizing flocculant for treating the urban sewage is applied to the sewage treatment, wherein the sewage treatment is carried out on water discharged by urban domestic sewage or phosphorus-containing laundry urban sewage, and 150mg of the dephosphorizing flocculant is added to each liter of the urban sewage.
Example 3
The dephosphorizing flocculant for treating the urban sewage comprises the following raw materials in parts by weight: 60 parts of ferric sulfate, 30 parts of chitosan, 23 parts of sodium silicate, 30 parts of ferrous sulfate, 30 parts of manganese dioxide, 20 parts of ferric oxide, 18 parts of hydrochloric acid solution, 16 parts of initiator and 17 parts of coagulant aid.
The purity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide and the ferric oxide is more than 95%, and the granularity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide, the ferric oxide and the chitosan is 300 meshes.
The chitosan is carboxymethylated chitosan.
The initiator is prepared from potassium persulfate and sodium sulfite according to a molar ratio of 1: 1.
The hydrochloric acid solution is 20% hydrochloric acid.
The preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 60 parts of ferric sulfate (light yellow solid particles), 30 parts of manganese dioxide (black orthorhombic crystals) and 20 parts of ferric oxide (reddish brown powder), and crushing the raw materials into particles of 20mm by using a crusher respectively for later use;
2) adding water into 60 parts of crushed ferric sulfate and 30 parts of crushed ferrous sulfate according to the total proportion of 1:2, heating to 80 ℃, and stirring for 30min to slowly dissolve the ferric sulfate and the ferrous sulfate, wherein the liquid is a red brown viscous liquid to prepare a solution A for later use; when ferrous sulfate exists in water, ferric sulfate is dissolved quickly, so that the dissolving time is saved;
3) taking the following components in parts by weight: 30 parts of chitosan, 18 parts of hydrochloric acid solution, 1/5 parts of total amount of hydrochloric acid solution and water are added for dilution to 1% hydrochloric acid, then the chitosan is slowly added into the 1% hydrochloric acid, and the mixture is stirred for 10min to prepare a chitosan mixed solution B for standby;
4) taking the following components in parts by weight: 23 parts of sodium silicate, dissolving in the solution A obtained in the step 2), and stirring for 8min until uniform to obtain a composite solution C which is alkaline for later use;
5) taking the following components in parts by weight: adding 20 parts of ferric oxide and 30 parts of manganese dioxide into 4/5 parts of hydrochloric acid solution in total amount of 18 parts, heating to 35 ℃, and stirring for 30min to obtain a mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 1 hour, heating to 80 ℃, sequentially adding 16 parts of weighed initiator and 17 parts of coagulant aid, uniformly mixing and reacting for 10 hours;
7) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying at 130 ℃ for 3 hours in hot air, and bagging for later use to obtain the dephosphorizing flocculant.
The dephosphorizing flocculant for treating the urban sewage is applied to the sewage treatment, wherein the sewage treatment is carried out on water discharged by urban domestic sewage or phosphorus-containing laundry urban sewage, and 150mg of the dephosphorizing flocculant is added to each liter of the urban sewage.
Example 4
The dephosphorizing flocculant for treating the urban sewage comprises the following raw materials in parts by weight: 55 parts of ferric sulfate, 25 parts of chitosan, 20 parts of sodium silicate, 28 parts of ferrous sulfate, 28 parts of manganese dioxide, 18 parts of ferric oxide, 17 parts of hydrochloric acid solution, 15 parts of initiator and 16 parts of coagulant aid.
The purity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide and the ferric oxide is more than 95%, and the granularity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide, the ferric oxide and the chitosan is 400 meshes.
The chitosan is quaternized chitosan.
The initiator is prepared from potassium persulfate and sodium sulfite according to a molar ratio of 1: 1.
The hydrochloric acid solution is hydrochloric acid with the concentration of 30%.
The preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 55 parts of ferric sulfate (light yellow solid particles), 28 parts of manganese dioxide (black orthorhombic crystals) and 18 parts of ferric oxide (reddish brown powder), and crushing the raw materials into particles of 30mm by using a crusher respectively for later use;
2) adding water into 55 parts of crushed ferric sulfate and 28 parts of crushed ferrous sulfate according to the total proportion of 1:2, heating to 90 ℃, and stirring for 30min to slowly dissolve the ferric sulfate and the ferrous sulfate, wherein the liquid is a red brown viscous liquid to prepare a solution A for later use; when ferrous sulfate exists in water, ferric sulfate is dissolved quickly, so that the dissolving time is saved;
3) taking the following components in parts by weight: 25 parts of chitosan, 17 parts of hydrochloric acid solution, 1/5, water and 1% hydrochloric acid, slowly adding the chitosan into the 1% hydrochloric acid, and stirring for 5min to obtain a chitosan mixed solution B for later use;
4) taking the following components in parts by weight: 20 parts of sodium silicate, dissolving in the solution A obtained in the step 2), and stirring for 10min until uniform to obtain a composite solution C which is alkaline for later use;
5) taking the following components in parts by weight: adding 18 parts of ferric oxide and 28 parts of manganese dioxide into 4/5 parts of hydrochloric acid solution, heating to 35 ℃, and stirring for 40min to obtain a mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 2 hours, heating to 75 ℃, sequentially adding 15 parts of weighed initiator and 16 parts of weighed coagulant aid, uniformly mixing and reacting for 10 hours;
7) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying at 150 ℃ for 3 hours in hot air, and bagging for later use to obtain the dephosphorizing flocculant.
The dephosphorizing flocculant for treating the urban sewage is applied to the sewage treatment, wherein the sewage treatment is carried out on water discharged by urban domestic sewage or phosphorus-containing laundry urban sewage, and 200mg of the dephosphorizing flocculant is added to each liter of the urban sewage.
Example 5
The dephosphorizing flocculant for treating the urban sewage comprises the following raw materials in parts by weight: 65 parts of ferric sulfate, 35 parts of chitosan, 25 parts of sodium silicate, 32 parts of ferrous sulfate, 32 parts of manganese dioxide, 22 parts of ferric oxide, 21 parts of hydrochloric acid solution, 17 parts of initiator and 18 parts of coagulant aid.
The purity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide and the ferric oxide is more than 95%, and the granularity of the ferric sulfate, the sodium silicate, the ferrous sulfate, the manganese dioxide, the ferric oxide and the chitosan is 200 meshes.
The chitosan is carboxymethylated chitosan.
The initiator is prepared from potassium persulfate and sodium sulfite according to a molar ratio of 1: 1.
The hydrochloric acid solution is 35% hydrochloric acid.
The preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 65 parts of ferric sulfate (light yellow solid particles), 32 parts of manganese dioxide (black orthorhombic crystals) and 22 parts of ferric oxide (reddish brown powder), and crushing the raw materials into particles of 30mm by using a crusher respectively for later use;
2) adding 65 parts of crushed ferric sulfate and 32 parts of crushed ferrous sulfate into water according to the total proportion of 1:2, heating the mixture to 85 ℃, and stirring the mixture for 20min to slowly dissolve the ferric sulfate and the ferrous sulfate, wherein the liquid is a red brown viscous liquid to prepare a solution A for later use; when ferrous sulfate exists in water, ferric sulfate is dissolved quickly, so that the dissolving time is saved;
3) taking the following components in parts by weight: 35 parts of chitosan, 21 parts of hydrochloric acid solution, 1/5 parts of total amount of hydrochloric acid solution and water are added for dilution to 1% hydrochloric acid, then the chitosan is slowly added into the 1% hydrochloric acid, and the mixture is stirred for 10min to prepare a chitosan mixed solution B for standby;
4) taking the following components in parts by weight: 25 parts of sodium silicate, dissolving in the solution A obtained in the step 2), and stirring for 10min until uniform to obtain a composite solution C which is alkaline for later use;
5) taking the following components in parts by weight: adding 22 parts of ferric oxide and 32 parts of manganese dioxide into 4/5 parts of hydrochloric acid solution, heating to 35 ℃, and stirring for 40min to obtain a mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 1 hour, heating to 85 ℃, sequentially adding 17 parts of weighed initiator and 18 parts of weighed coagulant aid, uniformly mixing and reacting for 12 hours;
7) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying at 150 ℃ for 2h, and bagging for later use to obtain the dephosphorizing flocculant.
The dephosphorizing flocculant for treating the urban sewage is applied to the sewage treatment, wherein the sewage treatment is carried out on water discharged by urban domestic sewage or phosphorus-containing laundry urban sewage, and 150mg of the dephosphorizing flocculant is added to each liter of the urban sewage.
Comparative example 1
The dephosphorizing flocculant for municipal sewage treatment was prepared in the same manner as in example 3 except that iron sulfate was not used as compared with example 3, and the other procedure was the same as in example 3. Namely, in the comparative example, the dephosphorizing flocculant for urban sewage treatment comprises the following raw materials in parts by weight: the feed comprises the following raw materials in parts by weight: 30 parts of chitosan, 23 parts of sodium silicate, 30 parts of ferrous sulfate, 30 parts of manganese dioxide, 20 parts of ferric oxide, 18 parts of hydrochloric acid solution, 16 parts of initiator and 17 parts of coagulant aid.
Comparative example 2
The dephosphorizing flocculant for municipal sewage treatment was prepared in the same manner as in example 3 except that chitosan was not used as compared with example 3, and the other procedure was the same as in example 3. Namely, in the comparative example, the dephosphorizing flocculant for urban sewage treatment comprises the following raw materials in parts by weight: the feed comprises the following raw materials in parts by weight: 60 parts of ferric sulfate, 23 parts of sodium silicate, 30 parts of ferrous sulfate, 30 parts of manganese dioxide, 20 parts of ferric oxide, 18 parts of hydrochloric acid solution, 16 parts of initiator and 17 parts of coagulant aid.
Comparative example 3
The dephosphorizing flocculant for urban sewage treatment was prepared in the same manner as in example 3 except that iron sulfate and chitosan were not used as compared with example 3, and the other procedure was the same as in example 3. Namely, in the comparative example, the dephosphorizing flocculant for urban sewage treatment comprises the following raw materials in parts by weight: the feed comprises the following raw materials in parts by weight: 23 parts of sodium silicate, 30 parts of ferrous sulfate, 30 parts of manganese dioxide, 20 parts of ferric oxide, 18 parts of hydrochloric acid solution, 16 parts of initiator and 17 parts of coagulant aid.
And (3) testing dephosphorization performance:
reference is made to the limits specified by the emission class one standard (GB 8978-1996). COD is determined by a chemical oxygen consumption determinator, turbidity is determined by a diatomite visual colorimetry, and phosphorus content is determined by a malachite green-phosphomolybdic heteropoly acid spectrophotometry.
The dephosphorization performance test of the dephosphorization flocculant for urban sewage treatment is performed by adopting the embodiment 3 and the comparative examples 1, 2 and 3 respectively, and the dephosphorization test result is detected as follows.
TABLE 1 test results Table
| Group of | COD(mg/L) | Chroma (double) | Total phosphorus (mg/L) |
| Example 3 | 139 | 23 | 25.2 |
| Comparative example 1 | 156 | 31 | 43.5 |
| Comparative example 2 | 175 | 37 | 54.9 |
| Comparative example 3 | 365 | 48 | 72.3 |
From the above results, the data in table 1 show that the inventive example 3 using the dephosphorizing flocculant has strong dephosphorizing performance, and has significant effect on COD, chromaticity and dephosphorizing rate of total phosphorus.
The preparation method and the dephosphorization flocculant for treating the municipal sewage, which are produced by the application of the preparation method, solve the problem of low-concentration phosphorus-containing municipal sewage treatment, make up for the defects of the existing dephosphorization flocculant, and have the advantages of good product stability, small using amount, high flocculation speed, good flocculation effect, short settling time, high treatment efficiency, wide application range, small sludge production amount, capability of simultaneously playing the roles of dephosphorization and dephosphorization, low treatment cost and simple process.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (8)
1. The dephosphorizing flocculant for urban sewage treatment is characterized by comprising the following raw materials in parts by weight: 40-80 parts of ferric sulfate, 20-40 parts of chitosan, 15-30 parts of sodium silicate, 25-35 parts of ferrous sulfate, 24-36 parts of manganese dioxide, 14-26 parts of ferric oxide, 13-25 parts of hydrochloric acid solution, 14-18 parts of an initiator and 15-19 parts of a coagulant aid;
the initiator is prepared from potassium persulfate and sodium sulfite according to a molar ratio of 1: 1;
the preparation method of the dephosphorizing flocculant for urban sewage treatment comprises the following steps:
1) taking the following components in parts by weight: 40-80 parts of ferric sulfate, 28-32 parts of manganese dioxide and 18-22 parts of ferric oxide are respectively crushed into particles of 10-30 mm by a crusher for later use;
2) adding water into 40-80 parts of crushed ferric sulfate and 28-32 parts of crushed ferrous sulfate according to the total proportion of 1:2, heating to 80-90 ℃, and stirring for 20-30min to slowly dissolve the ferric sulfate and the ferrous sulfate to obtain a red brown viscous liquid as a solution A for later use;
3) taking the following components in parts by weight: 25-35 parts of chitosan, 13-25 parts of hydrochloric acid solution, 1/5 parts of total amount, water is added for dilution to 1% hydrochloric acid, then the chitosan is slowly added into the 1% hydrochloric acid, and the mixture is stirred for 5-10min to prepare a chitosan mixed solution B for later use;
4) taking the following components in parts by weight: 20-25 parts of sodium silicate, dissolving in the solution A obtained in the step 2), and stirring for 5-10min until uniform to obtain a composite solution C which is alkaline for later use;
5) taking the following components in parts by weight: 18-22 parts of ferric oxide and 28-32 parts of manganese dioxide are added into 4/5 solution of hydrochloric acid solution 13-25 parts of total weight, heated to 30-45 ℃ and stirred for 30-40min to prepare mixed solution D for later use;
6) adding the prepared chitosan mixed solution B, the prepared composite solution C and the prepared mixed solution D into a container for multiple times, stirring for 1-2 hours, heating to 75-85 ℃, sequentially adding 15-17 parts of weighed initiator and 16-18 parts of weighed coagulant aid, uniformly mixing and reacting for 8-12 hours;
7) and (3) filtering the feed liquid obtained in the step 6), feeding the filter material into a drying bed for drying at the temperature of 120-150 ℃ for 2-3 h under hot air, and bagging for later use to obtain the dephosphorizing flocculant.
2. The dephosphorizing flocculant for urban sewage treatment according to claim 1, which comprises the following raw materials in parts by weight: 55-65 parts of ferric sulfate, 25-35 parts of chitosan, 20-25 parts of sodium silicate, 28-32 parts of ferrous sulfate, 28-32 parts of manganese dioxide, 18-22 parts of ferric oxide, 17-21 parts of hydrochloric acid solution, 15-17 parts of an initiator and 16-18 parts of a coagulant aid.
3. The dephosphorizing flocculant for urban sewage treatment according to claim 2, which comprises the following raw materials in parts by weight: 60 parts of ferric sulfate, 30 parts of chitosan, 23 parts of sodium silicate, 30 parts of ferrous sulfate, 30 parts of manganese dioxide, 20 parts of ferric oxide, 18 parts of hydrochloric acid solution, 16 parts of initiator and 17 parts of coagulant aid.
4. The dephosphorizing flocculant for urban sewage treatment according to claim 1, wherein the purity of ferric sulfate, sodium silicate, ferrous sulfate, manganese dioxide and ferric oxide is more than 95%, and the particle size of the ferric sulfate, sodium silicate, ferrous sulfate, manganese dioxide, ferric oxide and chitosan is 150-400 meshes.
5. The dephosphorizing flocculant for urban sewage treatment according to claim 1, wherein the chitosan is quaternized chitosan or carboxymethylated chitosan.
6. The dephosphorizing flocculant for urban sewage treatment according to claim 1, wherein the hydrochloric acid solution is hydrochloric acid with a concentration of 12% to 35%.
7. The dephosphorizing flocculant for urban sewage treatment according to claim 1, wherein in step 7), drying is carried out for 2-3 hours at 120-150 ℃ under hot air.
8. The use of the dephosphorizing flocculant for urban sewage treatment according to any one of claims 1 to 7 in sewage treatment, wherein the sewage treatment is performed on water discharged from urban domestic sewage or phosphorus-containing laundry urban sewage, and the amount of the dephosphorizing flocculant added is 100 to 200mg per liter of the urban sewage.
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| CN1438972A (en) * | 2000-06-27 | 2003-08-27 | 宝洁公司 | Composition for water treatment |
| CN102344191A (en) * | 2010-08-06 | 2012-02-08 | 中国科学院生态环境研究中心 | Method for improving flocculation effect and increasing particle size of flocs through reinforcing heterogeneous coacervation process |
| CN102897878A (en) * | 2011-07-27 | 2013-01-30 | 广东粤海控股有限公司 | High efficiency composite coagulant |
| CN104085971A (en) * | 2014-07-10 | 2014-10-08 | 中昊(大连)化工研究设计院有限公司 | Compounded cationic flocculant and preparation method thereof |
| CN107935154A (en) * | 2018-01-12 | 2018-04-20 | 常州华禹环保科技有限公司 | Compound metal ion flocculant and preparation method thereof |
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| CN1438972A (en) * | 2000-06-27 | 2003-08-27 | 宝洁公司 | Composition for water treatment |
| CN102344191A (en) * | 2010-08-06 | 2012-02-08 | 中国科学院生态环境研究中心 | Method for improving flocculation effect and increasing particle size of flocs through reinforcing heterogeneous coacervation process |
| CN102897878A (en) * | 2011-07-27 | 2013-01-30 | 广东粤海控股有限公司 | High efficiency composite coagulant |
| CN104085971A (en) * | 2014-07-10 | 2014-10-08 | 中昊(大连)化工研究设计院有限公司 | Compounded cationic flocculant and preparation method thereof |
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