CN112661234A - Efficient phosphorus removal agent for sewage treatment and preparation method thereof - Google Patents
Efficient phosphorus removal agent for sewage treatment and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-efficiency phosphorus removal agent for sewage treatment and a preparation method thereof, and relates to the technical field of sewage treatment, wherein the high-efficiency phosphorus removal agent consists of the following components: the activated kaolin clay greatly increases the porosity and specific surface area on one hand, and can be used as an excellent carrier for subsequent metal salt loading; the polyaluminium chloride is a compound high molecular polymer, has a huge molecular structure and strong adsorption capacity, can effectively adsorb phosphorus-containing substances in sewage, has an excellent water purification effect, forms a flocculation structure in water, has a high precipitation speed, high activity and good filterability, has strong adaptability to various kinds of sewage, and has little influence on the pH value.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a high-efficiency phosphorus removal agent for sewage treatment and a preparation method thereof.
Background
Phosphorus is one of the main elements required by biological growth, in a surface fresh water system, phosphate is usually a limiting factor of plant growth, in a normal fresh water system, the phosphorus content is usually limited, once the phosphorus content exceeds a certain amount, the increased phosphate can cause the overgrowth of plants, cause the eutrophication of water bodies, the rapid propagation of algae and other plankton, the reduction of the dissolved oxygen content of the water bodies, the deterioration of water quality and the phenomenon of mass death of fishes and other organisms, municipal domestic sewage is mainly various kitchen water, washing water and toilet water used in human life, is mainly nontoxic inorganic salts, contains a large amount of solid suspended matters, chemical or biodegradable soluble or colloidal dispersed organic matters, nitrogen compounds, phosphate, potassium sodium, heavy metal ions, flora and the like, and along with the wide use of various detergents, the phosphorus content of domestic sewage is also widely increased, and the sewage with high phosphorus content can cause pollution such as water enrichment and the like, so the domestic sewage needs to be treated before being discharged so as to reduce the phosphorus content in the wastewater.
The advanced treatment of trace phosphorus in water is generally carried out by adopting an adsorption method, and the problems exist at present that the phosphorus removal adsorbent has low adsorption capacity for low-concentration phosphorus, and a cheap and efficient phosphorus removal adsorption material still needs to be developed. Adding flocculating and precipitating agents into water, and then filtering, retaining and precipitating to remove phosphorus in the water, and is also a method for producing reclaimed water in some sewage treatment plants at present.
Disclosure of Invention
The invention aims to provide a high-efficiency phosphorus removal agent for sewage treatment, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an efficient phosphorus removal agent for sewage treatment comprises the following components in parts by mass: 45-75 parts of ferrous chloride, 6-13 parts of silicon dioxide, 8-16 parts of natural mineral powder, 4-9 parts of a coagulant aid, 12-24 parts of polyaluminum chloride, 15-25 parts of a catalyst, 7-14 parts of a stabilizer, 12-15 parts of polyacrylamide, 12-17 parts of kaolin and 6-12 parts of nano mineral crystals.
As a further scheme of the invention: an efficient phosphorus removal agent for sewage treatment comprises the following components in parts by mass: 65 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 18 parts of polyaluminium chloride, 20 parts of a catalyst, 11 parts of a stabilizer, 14 parts of polyacrylamide, 15 parts of kaolin and 9 parts of nano-mineral crystals.
As a still further scheme of the invention: the catalyst is hydrochloric acid.
As a still further scheme of the invention: the stabilizer is sodium nitrite.
As a still further scheme of the invention: the coagulant aid is one or more of a pH value regulator and an oxidant.
As a still further scheme of the invention: the nano-mineral crystal is one or more of attapulgite, diatomite and sepiolite.
A preparation method of a high-efficiency phosphorus removal agent for sewage treatment comprises the following steps:
s1, preparing materials: weighing and preparing raw materials of each component according to corresponding parts by weight;
s2, drying the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container, and stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A;
s3, naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at the temperature of 400 ℃ for 500 ℃ for 8-10min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1-1.5h, drying the treated kaolin at the temperature of 30-35 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% for 0.5-1h according to the weight ratio of 1:3, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the phosphorus removal efficiency after being modified;
s4, mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, stirring uniformly, and heating and stirring for reaction;
s5, continuously adding the stabilizer and the coagulant aid, and reacting for 3-5h at 80-120 ℃ to obtain the high-efficiency sewage dephosphorizing agent.
As a still further scheme of the invention: in step S2, the temperature of the drying is 90 to 140 degrees celsius.
As a still further scheme of the invention: after the step S5, the method further comprises the step of drying and dehydrating the high-efficiency sewage dephosphorizing agent at 85-105 ℃ to form a solid high-efficiency sewage dephosphorizing agent.
As a still further scheme of the invention: in step S2, the temperature of stirring and mixing is 80-110 ℃ and the reaction time is 1.5-2h, and in step S4, the temperature of stirring and mixing is 75-100 ℃ and the reaction time is 1-1.5 h.
Compared with the prior art, the invention has the beneficial effects that: an efficient phosphorus removal agent for sewage treatment:
1) the kaolin can form a stable dispersion system after being activated by alkali, and the activated kaolin clay greatly increases the porosity and the specific surface area on one hand and can be used as an excellent carrier during subsequent metal salt loading;
2) the polyaluminium chloride is a compound high molecular polymer, has a huge molecular structure and strong adsorption capacity, can effectively adsorb phosphorus-containing substances in sewage, and has an excellent water purification effect. The flocculant forms a flocculated structure in water, and has the advantages of high precipitation speed, high activity and good filterability. The polyaluminium chloride has strong adaptability to various sewage, has small influence on the pH value, and has small corrosivity to equipment and pipelines, convenient operation and small use amount, thereby effectively reducing the purification cost;
3) the preparation process of the high-efficiency composite phosphorus removing agent is simple; the used ferrous chloride is low in price, can use byproducts of upstream industries, is beneficial to reducing the cost of the composite phosphorus removing agent, and can effectively remove phosphorus in inorganic and organic phosphorus-containing wastewater by utilizing the synergistic interaction among the components; has the advantages of simple preparation, convenient use, low price, small dosage, quick reaction, excellent dephosphorization effect, wide application range and the like.
Detailed Description
The kaolin can form a stable dispersion system after being activated by alkali, and the activated kaolin clay greatly increases the porosity and the specific surface area on one hand and can be used as an excellent carrier during subsequent metal salt loading; the polyaluminium chloride is a composite high molecular polymer, has a huge molecular structure and strong adsorption capacity, can effectively adsorb phosphorus-containing substances in sewage, has an excellent water purification effect, forms a flocculation structure in the sewage, has a high precipitation speed, high activity and good filterability, has strong adaptability to various kinds of sewage and has small influence on the pH value, and in addition, the polyaluminium chloride has small corrosivity to equipment and pipelines, is convenient to operate and small in use amount, and effectively reduces the purification cost.
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
Example 1
Weighing 45 parts of ferrous chloride, 6 parts of silicon dioxide, 8 parts of natural mineral powder, 4 parts of a coagulant aid, 12 parts of polyaluminium chloride, 15 parts of a catalyst, 7 parts of a stabilizer, 12 parts of polyacrylamide, 12 parts of kaolin and 6 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a pH value regulator, and the nano-mineral crystal is attapulgite, and preparing raw materials of the components according to corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 90 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 80 ℃, and the reaction time is 1.5 h; naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at 400 ℃ for 8min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1h, drying the treated kaolin at 30 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% for 0.5h, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 75 ℃, and the reaction time is 1 h; and continuously adding the stabilizer and the coagulant aid, reacting for 3 hours at the temperature of 80 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at the temperature of 85 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Example 2
Weighing 50 parts of ferrous chloride, 7 parts of silicon dioxide, 9 parts of natural mineral powder, 5 parts of a coagulant aid, 15 parts of polyaluminium chloride, 17 parts of a catalyst, 8 parts of a stabilizer, 13 parts of polyacrylamide, 13 parts of kaolin and 7 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is an oxidizing agent, and the nano-mineral crystal is diatomite, and preparing raw materials of the components according to corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 95 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 85 ℃, and the reaction time is 1.6 h; naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at the temperature of 410 ℃ for 9min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.1h, drying the treated kaolin at the temperature of 31 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% according to the weight ratio of 1:3 for 0.6h, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 80 ℃, and the reaction time is 1.1 h; and continuously adding the stabilizer and the coagulant aid, reacting for 3.5 hours at 85 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 90 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Example 3
55 parts of ferrous chloride, 8 parts of silicon dioxide, 10 parts of natural mineral powder, 6 parts of a coagulant aid, 17 parts of polyaluminium chloride, 19 parts of a catalyst, 9 parts of a stabilizer, 14 parts of polyacrylamide, 14 parts of kaolin and 8 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is sepiolite, and raw materials of the components are prepared according to corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 105 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 90 ℃, and the reaction time is 1.7 h; naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at the temperature of 430 ℃ for 10min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.2h, drying the treated kaolin at the temperature of 32 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% according to the weight ratio of 1:3 for 0.7h, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 85 ℃, and the reaction time is 1.2 h; and continuously adding the stabilizer and the coagulant aid, reacting for 4 hours at 90 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 95 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Example 4
60 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 19 parts of polyaluminium chloride, 21 parts of a catalyst, 10 parts of a stabilizer, 15 parts of polyacrylamide, 15 parts of kaolin and 10 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is a mixture of attapulgite and diatomite, the mixing ratio is 1:1, and raw materials of the components are weighed according to the corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 115 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 95 ℃, and the reaction time is 1.8 h; naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at 450 ℃ for 9min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.3h, drying the treated kaolin at 33 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% for 0.8h according to the weight ratio of 1:3, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 90 ℃, and the reaction time is 1.3 h; and continuously adding the stabilizer and the coagulant aid, reacting for 4.5 hours at 100 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 100 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Example 5
Taking 65 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 18 parts of polyaluminium chloride, 20 parts of a catalyst, 11 parts of a stabilizer, 14 parts of polyacrylamide, 15 parts of kaolin and 9 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is a mixture of attapulgite and sepiolite, the mixing ratio is 1:1, and weighing and preparing raw materials of each component according to corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 125 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 100 ℃, and the reaction time is 1.8 h; naturally drying kaolin, putting the kaolin into an iron pan for frying at 470 ℃ for 8min, soaking the fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.4h, drying the treated kaolin at 34 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% according to the weight ratio of 1:3 for 0.9h, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 95 ℃, and the reaction time is 1.4 h; and continuously adding the stabilizer and the coagulant aid, reacting for 4 hours at 105 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 95 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Example 6
Taking 70 parts of ferrous chloride, 12 parts of silicon dioxide, 14 parts of natural mineral powder, 9 parts of a coagulant aid, 23 parts of polyaluminium chloride, 23 parts of a catalyst, 13 parts of a stabilizer, 12 parts of polyacrylamide, 14 parts of kaolin and 9 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is a mixture of diatomite and sepiolite, the mixing ratio is 1:1, and weighing and preparing raw materials of each component according to corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 125 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 110 ℃, and the reaction time is 1.9 h; naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at 480 ℃ for 10min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.4h, drying the treated kaolin at 34 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% for 0.9h according to the weight ratio of 1:3, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 95 ℃, and the reaction time is 1.4 h; and continuously adding the stabilizer and the coagulant aid, reacting for 3.5 hours at 110 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 90 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Example 7
Taking 75 parts of ferrous chloride, 13 parts of silicon dioxide, 16 parts of natural mineral powder, 9 parts of a coagulant aid, 24 parts of polyaluminium chloride, 25 parts of a catalyst, 14 parts of a stabilizer, 15 parts of polyacrylamide, 17 parts of kaolin and 12 parts of a nano-mineral crystal, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is a mixture of attapulgite, diatomite and sepiolite, the mixing ratio is 1:1:1, and weighing and preparing raw materials of each component according to corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 140 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 110 ℃, and the reaction time is 2 hours; naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at 500 ℃ for 10min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.5h, drying the treated kaolin at 35 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% for 1h according to the weight ratio of 1:3, vibrating the kaolin by using ultrasonic waves in the soaking process, drying the kaolin to obtain modified kaolin, and effectively improving the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 100 ℃, and the reaction time is 1.5 h; and continuously adding the stabilizer and the coagulant aid, reacting for 3.5 hours at 120 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 105 ℃ to form the solid high-efficiency sewage phosphorus removal agent.
Comparative example 1
Taking 65 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 20 parts of a catalyst, 11 parts of a stabilizer, 14 parts of polyacrylamide, 15 parts of kaolin and 9 parts of nano-mineral crystals, wherein the catalyst is hydrochloric acid, the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystals are a mixture of attapulgite and sepiolite, the mixing ratio is 1:1, and weighing and preparing the raw materials of the components according to the corresponding parts by weight; placing the ferrous chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 125 ℃, stirring and mixing the dried ferrous chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 100 ℃, and the reaction time is 1.8 h; naturally drying kaolin, putting the kaolin into an iron pan for frying at 470 ℃ for 8min, soaking the fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1.4h, drying the treated kaolin at 34 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% according to the weight ratio of 1:3 for 0.9h, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the dephosphorization efficiency after modification treatment; mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 95 ℃, and the reaction time is 1.4 h; and continuously adding the stabilizer and the coagulant aid, reacting for 4 hours at 105 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 95 ℃ to form the solid sewage phosphorus removal agent.
Comparative example 2
Taking 65 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 18 parts of polyaluminium chloride, 20 parts of a catalyst, 11 parts of a stabilizer, 14 parts of polyacrylamide and 9 parts of a nano-mineral crystal, wherein the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is a mixture of attapulgite and sepiolite, the mixing ratio is 1:1, and weighing and preparing the raw materials of the components according to the corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 125 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 100 ℃, and the reaction time is 1.8 h; adding the solution A into the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 95 ℃, and the reaction time is 1.4 h; and continuously adding the stabilizer and the coagulant aid, reacting for 4 hours at 105 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 95 ℃ to form the solid sewage phosphorus removal agent.
Comparative example 3
Taking 65 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 20 parts of a catalyst, 11 parts of a stabilizer, 14 parts of polyacrylamide and 9 parts of a nano-mineral crystal, wherein the stabilizer is sodium nitrite, the coagulant aid is a mixture of a pH value regulator and an oxidant, the mixing ratio is 1:1, the nano-mineral crystal is a mixture of attapulgite and sepiolite, the mixing ratio is 1:1, and weighing and preparing the raw materials of the components according to the corresponding parts by weight; placing the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container for drying, wherein the drying temperature is 125 ℃, stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A, wherein the stirring and mixing temperature is 100 ℃, and the reaction time is 1.8 h; adding the solution A into the nano-mineral crystal, uniformly stirring, heating, stirring and reacting, wherein the stirring and mixing temperature is 95 ℃, and the reaction time is 1.4 h; and continuously adding the stabilizer and the coagulant aid, reacting for 4 hours at 105 ℃ to obtain the high-efficiency sewage phosphorus removal agent, and drying and dehydrating the high-efficiency sewage phosphorus removal agent at 95 ℃ to form the solid sewage phosphorus removal agent.
Test method
Water test: the phosphorus concentration was measured by potassium molybdenum antimony persulfate anti-spectrophotometric method, and the samples of examples and comparative examples were measured by TU-1810 UV-visible spectrophotometer, respectively.
The results of the total phosphorus concentration (mg/L) tests of examples 1 to 7 and comparative examples 1 to 3 in the water test 20min, 40min and 60min after the respective charges to the samples 1 to 3 are shown in Table 1:
TABLE 1
In conclusion, the kaolin can form a stable dispersion system after being activated by alkali, and the activated kaolin clay greatly increases the porosity and specific surface area and can be used as an excellent carrier during subsequent metal salt loading; the polyaluminium chloride is a composite high molecular polymer, has a huge molecular structure and strong adsorption capacity, can effectively adsorb phosphorus-containing substances in sewage, has an excellent water purification effect, forms a flocculation structure in the sewage, has a high precipitation speed, high activity and good filterability, has strong adaptability to various kinds of sewage and has small influence on the pH value, and in addition, the polyaluminium chloride has small corrosivity to equipment and pipelines, is convenient to operate and small in use amount, and effectively reduces the purification cost.
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 (10)
1. The efficient phosphorus removal agent for sewage treatment is characterized by comprising the following components in parts by mass: 45-75 parts of ferrous chloride, 6-13 parts of silicon dioxide, 8-16 parts of natural mineral powder, 4-9 parts of a coagulant aid, 12-24 parts of polyaluminum chloride, 15-25 parts of a catalyst, 7-14 parts of a stabilizer, 12-15 parts of polyacrylamide, 12-17 parts of kaolin and 6-12 parts of nano mineral crystals.
2. The efficient phosphorus removal agent for sewage treatment as claimed in claim 1, wherein the efficient phosphorus removal agent comprises the following components in parts by mass: 65 parts of ferrous chloride, 9 parts of silicon dioxide, 12 parts of natural mineral powder, 7 parts of a coagulant aid, 18 parts of polyaluminium chloride, 20 parts of a catalyst, 11 parts of a stabilizer, 14 parts of polyacrylamide, 15 parts of kaolin and 9 parts of nano-mineral crystals.
3. The efficient phosphorus removal agent for sewage treatment as claimed in claim 1 or 2, wherein the catalyst is hydrochloric acid.
4. The efficient phosphorus removal agent for sewage treatment as claimed in claim 3, wherein the stabilizer is sodium nitrite.
5. The efficient phosphorus removal agent for sewage treatment as claimed in claim 4, wherein the coagulant aid is one or more of a pH value regulator and an oxidant.
6. The efficient phosphorus removal agent for sewage treatment as claimed in claim 5, wherein the nano-mineral crystal is one or more of attapulgite, diatomite and sepiolite.
7. A method for preparing the high-efficiency phosphorus removal agent for sewage treatment as defined in any one of claims 1 to 6, comprising the following steps:
s1, preparing materials: weighing and preparing raw materials of each component according to corresponding parts by weight;
s2, drying the ferrous chloride, the polyaluminium chloride and the silicon dioxide in a drying container, and stirring and mixing the dried ferrous chloride, the polyaluminium chloride, the silicon dioxide, the catalyst and the polyacrylamide to form a solvent A;
s3, naturally drying kaolin, putting the kaolin into an iron pan for stir-frying at the temperature of 400 ℃ for 500 ℃ for 8-10min, soaking the stir-fried kaolin in a hydrofluoric acid solution with the mass fraction of 15% for 1-1.5h, drying the treated kaolin at the temperature of 30-35 ℃, soaking the kaolin in a solution prepared from aluminum sulfate and a sulfuric acid solution with the mass fraction of 1% for 0.5-1h according to the weight ratio of 1:3, vibrating the kaolin by using ultrasonic waves in the soaking process, and drying the kaolin to obtain modified kaolin, wherein the modified kaolin can effectively improve the phosphorus removal efficiency after being modified;
s4, mixing and stirring the solution A and the modified kaolin, adding the nano-mineral crystal, stirring uniformly, and heating and stirring for reaction;
s5, continuously adding the stabilizer and the coagulant aid, and reacting for 3-5h at 80-120 ℃ to obtain the high-efficiency sewage dephosphorizing agent.
8. The method of claim 7, wherein in step S2, the drying temperature is 90-140 ℃.
9. The method for preparing the efficient phosphorus removal agent for sewage treatment as claimed in claim 8, further comprising a step of drying and dehydrating the efficient phosphorus removal agent at 85-105 ℃ after step S5, thereby forming a solid efficient phosphorus removal agent.
10. The method of claim 9, wherein the temperature of the agitation and mixing is 80-110 ℃ and the reaction time is 1.5-2h in step S2, and the temperature of the agitation and mixing is 75-100 ℃ and the reaction time is 1-1.5h in step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110090138.5A CN112661234A (en) | 2021-01-22 | 2021-01-22 | Efficient phosphorus removal agent for sewage treatment and preparation method thereof |
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| CN114538555A (en) * | 2021-12-16 | 2022-05-27 | 神美科技有限公司 | Efficient phosphorus removal agent for removing phosphorus from sewage and preparation method thereof |
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