Composition for purifying turbid water and method for purifying turbid water

Abstract

The present application provides a kind of composition for purifying turbid circulating water and its purification method, and the composition for purifying turbid circulating water includes converter dust, electric furnace dust, iron oxide scale, ferrous sulfate, surfactant, high molecular flocculant, sodium sulfate, polyacrylamide and sodium polyepoxysuccinate.The composition for purifying turbid circulating water of the present application is adsorbed with oil in turbid circulating water to produce floc with high specific gravity, has the characteristics of large specific surface area, high specific gravity and strong adsorption capacity, improves the floc precipitation speed, and further solves the problem of large use of coagulant and low floc precipitation efficiency caused by high oil content and low coagulation carrier concentration of turbid circulating water;It improves the treatment efficiency of sewage treatment device, reduces the processing cost, so as to improve the economic benefit of the whole turbid circulating water treatment technology.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and more specifically, to a composition for purifying turbid circulating water and a purification method thereof. Background Technology

[0002] Turbidified water treatment technology is a crucial step in the steel industry, primarily aimed at removing suspended solids, grease, and other contaminants from the water to ensure the normal operation of continuous casting machines and improve product quality. Existing technologies include horizontal flow sedimentation tanks, chemical degreasing devices, and rare earth magnetic disk treatment; however, these technologies suffer from drawbacks such as high operating costs and poor effluent quality leading to nozzle clogging in continuous casting machines.

[0003] Existing technology discloses a pressurized integrated metallurgical wastewater purification technology. Specifically, turbid circulating water generated during continuous casting and rolling processes in the steel industry is collected from the production workshop and undergoes preliminary sedimentation in a cyclone sedimentation tank or a horizontal flow sedimentation tank. After preliminary sedimentation, the turbid circulating water is pumped under pressure into a pressurized integrated metallurgical wastewater purification device. Polyaluminum chloride (PAC) is added as a coagulant in the primary flocculation reaction chamber to form micro-flocculations. The pressurized turbid circulating water then enters the secondary flocculation reaction chamber, where polyacrylamide (PAF) is added to form large-particle flocs. Under the action of the hydraulic circulation clarification zone, the flocs further grow and achieve mud-water separation, settling in the sedimentation zone to achieve the purpose of purifying the turbid circulating water. Although this technology is characterized by its resistance to clogging and simple maintenance, it still has the following drawbacks: the high oil content and low concentration of coagulable carriers in the turbid circulating water lead to the large-scale use of coagulants and low floc settling efficiency. These problems not only affect the treatment efficiency of the wastewater treatment device but also increase treatment costs, thus impacting the overall economic benefits of the turbid circulating water treatment technology.

[0004] Therefore, there is an urgent need for an economical and efficient method for treating turbid circulating water. Summary of the Invention

[0005] The purpose of this invention is to provide a composition and a purification method for purifying turbid circulating water, thereby solving at least one problem existing in the prior art.

[0006] A composition for purifying turbid circulating water includes converter dust, electric furnace dust, iron oxide scale, ferrous sulfate, surfactant, polymeric coagulant, sodium sulfate, polyacrylamide, and sodium polyepoxysuccinate.

[0007] Further, preferably, it is prepared from the following components in parts by weight:

[0008] 600-700 parts of converter dust, 50-120 parts of electric furnace dust, 100-150 parts of iron oxide scale, 30-50 parts of ferrous sulfate, 20 parts of surfactant, 20-30 parts of polymeric coagulant, 30 parts of sodium sulfate, 10-15 parts of polyacrylamide and 10-15 parts of sodium polyepoxysuccinate.

[0009] Further, preferably, the polymeric coagulant is any one of sodium carboxymethyl cellulose, chitosan, sodium alginate, starch coagulant, polyacrylamide, sodium polyacrylate, or polydimethyldiallyl ammonium chloride.

[0010] Further, preferably, the surfactant is any one of sodium lignosulfonate, alkyl sulfonate, calcium lignosulfonate, quaternary ammonium salt surfactant, polyoxyethylene type surfactant, or propylene alcohol polyoxyethylene ether.

[0011] The present invention also includes a method for purifying turbid circulating water, which uses the above-mentioned composition for purifying turbid circulating water, and the method includes thoroughly mixing the various components of the composition for purifying turbid circulating water.

[0012] The mixed composition for purifying turbid circulating water is added to a pressurized integrated wastewater purification device;

[0013] The pressurized integrated wastewater purification device is used to purify turbid circulating water.

[0014] Further, a preferred method includes thoroughly mixing the components of the composition for purifying turbid circulating water; and adding the mixed composition for purifying turbid circulating water to a pressurized integrated wastewater purification device.

[0015] The components of the composition for purifying turbid circulating water are contacted and mixed in a stirred reactor for 2 hours to obtain a homogenized composition for purifying turbid circulating water.

[0016] The mixed composition for purifying turbid circulating water is added into the suction well of the cyclone pool through a screw metering device and thoroughly mixed with the turbid circulating water to be purified.

[0017] The mixed composition for purifying turbid circulating water is fed into the pressurized integrated wastewater purification device along with the turbid circulating water to be purified.

[0018] Further, a preferred method includes thoroughly mixing the components of the composition for purifying turbid circulating water; and adding the mixed composition for purifying turbid circulating water to a pressurized integrated wastewater purification device.

[0019] The components of the composition for purifying turbid circulating water are continuously stirred with water in a stirred reactor to form a suspension of the composition for purifying turbid circulating water.

[0020] The suspension of the composition used to purify turbid circulating water is fed into the inlet pipe of the pressurized integrated sewage purification device through a metering pump.

[0021] Furthermore, a preferred method includes the step of purifying the circulating turbid water using the aforementioned pressurized integrated wastewater purification device, comprising:

[0022] The composition for purifying turbid circulating water enters the cyclone sedimentation chamber tangentially through the inlet pipe to remove large solid particulate impurities by utilizing cyclone sedimentation.

[0023] The turbid circulating water after cyclone sedimentation is introduced into the primary flocculation reaction chamber for primary flocculation reaction;

[0024] The turbid circulating water after the primary flocculation reaction is introduced into the secondary sedimentation chamber for secondary sedimentation and separation.

[0025] The turbid circulating water that has undergone secondary sedimentation and classification is introduced into the secondary flocculation reaction chamber for secondary flocculation reaction to increase the size of the flocs;

[0026] The turbid circulating water after the secondary flocculation reaction is injected into the hydraulic circulation clarification chamber through a nozzle for clarification.

[0027] The clarified water is fed into the inclined tube three-stage sedimentation zone for sedimentation and concentration.

[0028] Furthermore, a preferred method includes conveying the clean water produced after the pressurized integrated sewage purification device has purified the turbid circulating water to a cooling tower.

[0029] The sludge produced after the turbid circulating water is purified by the pressurized integrated sewage purification device is transported to a filter press to form a sludge cake.

[0030] As described above, the present invention provides a composition and method for purifying turbid circulating water. This involves adding solid waste generated during steel smelting (such as converter dust, electric furnace dust, and iron oxide scale) to the composition for purifying turbid circulating water, and combining the aforementioned solid waste with ferrous sulfate, sodium lignosulfonate, sodium polyacrylate, sodium sulfate, polyacrylamide, and sodium polyepoxysuccinate to form the composition for purifying turbid circulating water. The beneficial effects are as follows:

[0031] 1) By using solid waste generated during the steel smelting process as a composition for purifying turbid circulating water, not only is the treatment cost of turbid circulating water reduced, but environmental risks are also reduced;

[0032] 2) The composition of the present invention for purifying turbid circulating water produces high-density flocs after adsorbing the oil in the turbid circulating water. These flocs have the characteristics of large specific surface area, high specific gravity, and strong adsorption capacity, which improves the sedimentation rate of the flocs. This solves the problems of high oil content and low concentration of coagulable carriers in turbid circulating water, which lead to the large use of coagulants and low floc sedimentation efficiency. It improves the treatment efficiency of the wastewater treatment device, reduces the treatment cost, and thus improves the economic benefits of the entire turbid circulating water treatment technology.

[0033] 3) The turbid circulating water purification method of the present invention is based on a pressurized integrated sewage purification device for turbid circulating water purification. The sludge produced has the characteristics of fast filtration speed and the sludge cake produced has the characteristics of looseness and low moisture content.

[0034] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below and particularly pointed out in the claims. The following description details certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to include all such aspects and their equivalents. Attached Figure Description

[0035] Figure 1 This is a schematic flowchart of a turbid circulating water purification method according to an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the process principle of the turbid circulating water purification method in Embodiment 1 of the present invention.

[0037] Figure 3 This is a schematic diagram of the process principle of the turbid circulating water purification method in Embodiment 2 of the present invention. Detailed Implementation

[0038] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they should be performed in accordance with the techniques or conditions described in the literature in this field, or according to the product instructions. Reagents or instruments whose manufacturers are not specified can be purchased from legitimate channels as conventional products.

[0039] It should be understood that the terms "upper", "lower", "front", "bottom", "top", "side", "width", "inner", "outer", etc., which indicate orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0040] The various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] This invention protects a composition for purifying turbid circulating water, comprising 600-700 parts of converter dust, 50-120 parts of electric furnace dust, 100-150 parts of iron oxide scale, 30-50 parts of ferrous sulfate, 20 parts of surfactant, 20-30 parts of polymeric coagulant, 30 parts of sodium sulfate, 10-15 parts of polyacrylamide, and 10-15 parts of sodium polyepoxysuccinate. Further, preferably, the polymeric coagulant is any one of sodium carboxymethyl cellulose, chitosan, sodium alginate, starch coagulant, polyacrylamide, sodium polyacrylate, or polydimethyldiallyl ammonium chloride. The surfactant is any one of sodium lignosulfonate, alkyl sulfonate, calcium lignosulfonate, quaternary ammonium salt surfactant, polyoxyethylene surfactant, or propylene glycol polyoxyethylene ether. Sodium polyacrylate is preferred as the polymeric coagulant. Sodium lignosulfonate is preferred as the surfactant. Experiments have shown that the composition of the present invention for purifying turbid circulating water can achieve the technical effects of increasing the specific gravity of flocs, accelerating the sedimentation rate of flocs, and reducing the dosage of coagulants and flocculants.

[0042] The existing pressurized integrated metallurgical wastewater purification and treatment device includes: a closed pressurized shell, within which are at least two sedimentation chambers and at least two flocculation reaction chambers, the sedimentation chambers and flocculation reaction chambers are staggered from bottom to top and sequentially connected, and a drain pipe is connected to the lower end of each sedimentation chamber, extending to the outside of the shell; an outlet pipe and an inlet pipe extending to the outside of the shell are respectively provided at the upper and lower parts of the shell; the sedimentation chambers include a vortex primary sedimentation chamber, a coagulation-guided secondary sedimentation chamber, an inclined tube tertiary sedimentation zone, and a quaternary sedimentation and concentration chamber; the flocculation reaction chambers include a primary flocculation reaction chamber and a secondary flocculation reaction chamber; wherein, the vortex primary sedimentation chamber, the primary flocculation reaction chamber, the flocculation-guided secondary sedimentation chamber, the secondary flocculation reaction chamber, the quaternary sedimentation and concentration chamber, and the inclined tube tertiary sedimentation zone are sequentially connected from bottom to top, the inclined tube tertiary sedimentation zone is located above the quaternary sedimentation and concentration chamber, the vortex primary sedimentation chamber is located at the bottom of the shell, and the inlet pipe is connected to the... The vortex primary sedimentation chamber is connected to the secondary sedimentation and concentration chamber. A clear water collection area is formed between the secondary sedimentation and concentration chamber and the top wall of the shell. A water inlet is provided at the bottom of the clear water collection area, which is connected to the outlet pipe. Several hollow spherical flocculation reactors are arranged at intervals in the primary and secondary flocculation reaction chambers. Multiple packing inclined tubes are inserted side by side at an angle in the inclined tube tertiary sedimentation zone. A hydraulic circulation clarification chamber is provided between the secondary flocculation reaction chamber and the secondary sedimentation and concentration chamber. A nozzle is placed at the top of the outlet of the secondary flocculation reaction chamber, and a throat is covered outside the nozzle. The throat is gradually widening from bottom to top, with openings at both the top and bottom. The lower end of the throat is located outside the side wall of the nozzle and has a certain gap with the nozzle. A flow guide baffle is provided outside the throat. The outlet of the hydraulic circulation clarification chamber is connected to the secondary sedimentation and concentration chamber. A sewage discharge pipe is provided at the bottom of the hydraulic circulation clarification chamber. The existing technologies have the following problems: 1) The suspended solids content in the continuous casting turbid circulating water is relatively low, which means that there are fewer particles that can be acted upon by the coagulant; 2) Compared with suspended solids, oily substances account for a higher proportion of the total pollutants, which increases the difficulty of treatment; that is, after the coagulant is added, hydraulic mixing is carried out in the hollow sphere of the primary flocculation reaction chamber. The hydraulic mixing time is short. When treating the continuous casting turbid circulating water, due to the presence of a large amount of oil, the coagulant cannot fully contact the suspended solids and oil. The only way to increase the probability of collision between the agent and the pollutants is to add a large amount of coagulant, resulting in low agent utilization.3) Due to the low suspended solids content, the concentration of coagulable carriers available for coagulant action in the water is insufficient; the resulting flocs are small in size and have a low specific gravity, which affects the floc settling efficiency and slows down the settling speed, thus limiting the treatment capacity of the pressurized integrated metallurgical wastewater treatment device. Specifically, when flocculant is added into the secondary flocculation reaction chamber, hydraulic mixing still occurs through hollow spheres. The micro-flocs formed in the primary flocculation reaction chamber further react with the flocculant to generate larger flocs. Because the coagulant utilization rate in the primary flocculation reaction chamber is low, there is a problem of over-dosing. When the over-dosed coagulant comes into contact with the flocculant, post-flocculation occurs. The post-flocculation reaction takes a long time to form flocs. Therefore, post-flocculation and floc deposition are prone to occur during the effluent transportation, storage, and use of the pressurized integrated metallurgical wastewater treatment device, affecting the water quality of subsequent water use. The composition for purifying turbid circulating water provided by this invention, when applied to existing pressurized integrated wastewater purification devices, can improve the removal rate of suspended solids and oil in pressurized integrated metallurgical wastewater purification devices, significantly increase the surface load of pressurized integrated metallurgical wastewater purification devices, thereby improving the turbid circulating water treatment capacity of pressurized integrated metallurgical wastewater purification devices; and greatly improve the dewatering performance of sludge, reducing investment in sludge dewatering facilities; ultimately achieving the technical effect of significantly improving the cost-effectiveness of pressurized integrated metallurgical wastewater purification devices in continuous casting turbid circulating water treatment projects.

[0043] The following will describe in detail various embodiments of the composition of the present invention for purifying turbid circulating water.

[0044] Example 1

[0045] Figures 1-2 The process of the turbid circulating water purification method according to embodiments of the present invention is described in detail. Specifically, Figure 1 This is a logical schematic diagram of a method for purifying turbid circulating water according to an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the flow principle of the turbid water purification method according to Embodiment 1 of the present invention. Figures 1-2 As shown, the turbid circulating water purification method includes the following steps.

[0046] S110. Thoroughly mix all components of the composition used for purifying turbid circulating water. Specifically, take converter dust, electric furnace dust, and iron oxide scale and pass them through a 200-mesh sieve, retaining the solid powder that passes through the sieve. Weigh out 600 parts of the sieved converter dust, 120 parts of electric furnace dust, 150 parts of iron oxide scale, 30 parts of ferrous sulfate, 20 parts of sodium lignosulfonate, 30 parts of sodium polyacrylate, 30 parts of sodium sulfate, 10 parts of polyacrylamide, and 10 parts of sodium polyepoxysuccinate, and contact and mix them in a stirred reactor for 2 hours.

[0047] S120. The mixed composition for purifying turbid circulating water is added to the pressurized integrated wastewater purification device. After the components of the composition for purifying turbid circulating water are mixed evenly, a special flocculant for the pressurized integrated wastewater purification device is prepared. It is then added to the suction well of the cyclone pool through a screw metering device. The special flocculant for the pressurized integrated wastewater purification device is rapidly mixed with the turbid circulating water under the stirring of the impeller of the cyclone pool lift pump and then pumped into the flocculation reaction zone of the pressurized integrated device for further reaction.

[0048] S130. The composition for purifying turbid circulating water enters the cyclone sedimentation chamber tangentially through the inlet pipe to remove large-sized solid particulate impurities using cyclone sedimentation. S140. The turbid circulating water after cyclone sedimentation is introduced into the primary flocculation reaction chamber for primary flocculation. S150. The turbid circulating water after primary flocculation is introduced into the secondary sedimentation chamber for secondary sedimentation separation. S160. The turbid circulating water separated by secondary sedimentation is introduced into the secondary flocculation reaction chamber for secondary flocculation to increase floc size. S170. The turbid circulating water after secondary flocculation is injected through a nozzle into the hydraulic circulation clarification chamber for clarification. S180. The clarified water is input into the inclined tube tertiary sedimentation zone for sedimentation and concentration. The purified water produced after turbid circulating water purification by the pressurized integrated wastewater purification device is transported to a cooling tower; the sludge produced after turbid circulating water purification by the pressurized integrated wastewater purification device is transported to a filter press for filtration to form sludge cake. During the reaction, oil in the turbid circulating water is adsorbed and forms high-density flocs together with suspended solids, which rapidly settle in the sedimentation zone to achieve mud-water separation. The oil content in the effluent from the integrated pressurized unit is reduced to less than 1 mg / L, and the surface loading is increased by 25%. The slurry solids content is increased by 8-10 times, and the filter press cycle is shortened by about 80%.

[0049] Example 2

[0050] Figure 1 and Figure 3 The process of the turbid circulating water purification method according to embodiments of the present invention is described in detail. Specifically, Figure 1 This is a logical schematic diagram of a method for purifying turbid circulating water according to an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the flow principle of the turbid water purification method according to Embodiment 1 of the present invention. Figure 1 and Figure 3 As shown, the turbid circulating water purification method includes the following steps.

[0051] S110. Thoroughly mix all components of the composition for purifying turbid circulating water. Specifically, this includes polyalumina and polyacrylamide. S120. Add the mixed composition for purifying turbid circulating water to the pressurized integrated wastewater purification device. After the components of the composition for purifying turbid circulating water are mixed with water, the suspension is pumped into the inlet pipe of the pressurized integrated device via a metering pump, where it continues to be hydraulically mixed. S130. The composition for purifying turbid circulating water enters the cyclone sedimentation chamber tangentially through the inlet pipe to remove large-particle solid impurities using cyclone sedimentation. S140. The turbid circulating water after cyclone sedimentation is introduced into the primary flocculation reaction chamber for primary flocculation. S150. The turbid circulating water after primary flocculation is introduced into the secondary sedimentation chamber for secondary sedimentation separation. S160. The turbid circulating water separated by secondary sedimentation is introduced into the secondary flocculation reaction chamber for secondary flocculation to increase floc size. S170. The turbid circulating water after the secondary flocculation reaction is injected into the hydraulic circulation clarification chamber through a nozzle for clarification. S180. The clarified water is fed into the inclined tube tertiary sedimentation zone for sedimentation and concentration. The clean water produced after the turbid circulating water is purified by the pressurized integrated wastewater purification device is transported to the cooling tower; the sludge produced after the turbid circulating water is purified by the pressurized integrated wastewater purification device is transported to the filter press for filtration to form a sludge cake. During the reaction process, small flocs are generated in the flocculation reaction zone, and the oil and suspended solids in the turbid circulating water are not fully adsorbed. The suspended solids in the purified effluent are 30 mg / L; the oil content in the effluent is less than 5 mg / L, and the surface loading is 12 m3 / ㎡·h; the surface loading is reduced by about 25% compared with the embodiment of the present invention. The sludge has good solid dewatering properties, the formed sludge cake has low water content, and the filter press cycle is shortened by about 90%.

[0052] Example 3

[0053] S110. Thoroughly mix all components of the composition used for purifying turbid circulating water. Specifically, take converter dust, electric furnace dust, and iron oxide scale and pass them through a 200-mesh sieve, retaining the solid powder that passes through the sieve. Weigh out 650 parts of the sieved converter dust, 80 parts of electric furnace dust, 120 parts of iron oxide scale, 40 parts of ferrous sulfate, 20 parts of sodium lignosulfonate, 25 parts of sodium polyacrylate, 30 parts of sodium sulfate, 12 parts of polyacrylamide, and 13 parts of sodium polyepoxysuccinate, and contact and mix them in a stirred reactor for 2 hours.

[0054] S120. The mixed composition for purifying turbid circulating water is added to the pressurized integrated wastewater purification device. After the components of the composition for purifying turbid circulating water are mixed evenly, a special flocculant for the pressurized integrated wastewater purification device is prepared. It is then added to the suction well of the cyclone pool through a screw metering device. The special flocculant for the pressurized integrated wastewater purification device is rapidly mixed with the turbid circulating water under the stirring of the impeller of the cyclone pool lift pump and then pumped into the flocculation reaction zone of the pressurized integrated device for further reaction.

[0055] S130. The composition for purifying turbid circulating water enters the cyclone sedimentation chamber tangentially through the inlet pipe to remove large-sized solid particulate impurities using cyclone sedimentation. S140. The turbid circulating water after cyclone sedimentation is introduced into the primary flocculation reaction chamber for primary flocculation. S150. The turbid circulating water after primary flocculation is introduced into the secondary sedimentation chamber for secondary sedimentation separation. S160. The turbid circulating water separated by secondary sedimentation is introduced into the secondary flocculation reaction chamber for secondary flocculation to increase floc size. S170. The turbid circulating water after secondary flocculation is injected through a nozzle into the hydraulic circulation clarification chamber for clarification. S180. The clarified water is input into the inclined tube tertiary sedimentation zone for sedimentation and concentration. The purified water produced after turbid circulating water purification by the pressurized integrated wastewater purification device is transported to a cooling tower; the sludge produced after turbid circulating water purification by the pressurized integrated wastewater purification device is transported to a filter press for filtration to form sludge cake. During the reaction, oil in the turbid circulating water is adsorbed and forms high-density flocs with suspended solids, which rapidly settle in the sedimentation zone to achieve mud-water separation. The oil content in the effluent from the integrated pressurized unit is reduced to below 1 mg / L, and the surface loading is 16 m³ / L. 3 The surface load was increased by 28% per square meter per hour. The moisture content of the filter cake was 20%. The solids content of the slurry increased by approximately 9 times, and the filter press cycle was shortened by approximately 90%.

[0056] Comparative Example 1

[0057] S110. Thoroughly mix all components of the composition used for purifying turbid circulating water. Specifically, it consists of polyaluminum chloride and polyacrylamide.

[0058] S120. The mixed composition for purifying turbid circulating water is added to the pressurized integrated wastewater purification device. After the components of the composition for purifying turbid circulating water are mixed evenly, a special flocculant for the pressurized integrated wastewater purification device is prepared. This flocculant is added to the suction well of the cyclone pool via a screw metering device. The special flocculant for the pressurized integrated wastewater purification device is rapidly mixed with the turbid circulating water under the stirring of the impeller of the cyclone pool lift pump and then pumped into the flocculation reaction zone of the pressurized integrated device for further reaction. S130. The composition for purifying turbid circulating water enters the cyclone sedimentation chamber tangentially through the inlet pipe to remove large-particle solid impurities using cyclone sedimentation. S140. The turbid circulating water after cyclone sedimentation is introduced into the primary flocculation reaction chamber for primary flocculation reaction. S150. The turbid circulating water after primary flocculation reaction is introduced into the secondary sedimentation chamber for secondary sedimentation separation. S160. The turbid circulating water separated by secondary sedimentation is introduced into the secondary flocculation reaction chamber for secondary flocculation reaction to increase floc size. S170. The turbid circulating water after the secondary flocculation reaction is injected into the hydraulic circulation clarification chamber through a nozzle for clarification. S180. The clarified water is then fed into the inclined tube tertiary sedimentation zone for sedimentation and concentration. During the reaction, the oil in the turbid circulating water is not fully adsorbed, forming relatively small flocs. After purification by the pressurized integrated wastewater treatment device, the suspended solids in the effluent of the turbid circulating water are 30 mg / L; the oil content is 5 mg / L; and the surface loading is 12 m³ / L. 3 / ㎡·h. The moisture content of the mud cake is 35%.

[0059] The present invention relates to a composition for purifying turbid circulating water and a purification method thereof, wherein solid waste generated during the iron and steel smelting process (such as converter dust, electric furnace dust, and iron oxide scale) is added to the composition for purifying turbid circulating water, and the composition for purifying turbid circulating water is formed by combining the above-mentioned solid waste with ferrous sulfate, sodium lignosulfonate, sodium polyacrylate, sodium sulfate, polyacrylamide, and sodium polyepoxysuccinate. By using solid waste generated during steel smelting as a composition for purifying turbid circulating water, not only are the treatment costs and environmental risks of turbid circulating water reduced, but the composition for purifying turbid circulating water of this invention also produces high-density flocs after adsorbing oils in the turbid circulating water. These flocs have a large specific surface area, high specific gravity, and strong adsorption capacity, which improves the sedimentation rate of the flocs. This solves the problems of high oil content and low concentration of coagulable carriers in turbid circulating water, which lead to the large use of coagulants and low floc sedimentation efficiency. This improves the treatment efficiency of the wastewater treatment device, reduces treatment costs, and thus improves the economic benefits of the entire turbid circulating water treatment technology. The turbid circulating water purification method of this invention is based on a pressurized integrated wastewater purification device for turbid circulating water purification. The sludge produced has the characteristics of fast filtration speed and the sludge cake produced has the characteristics of loose texture and low moisture content.

[0060] However, those skilled in the art should understand that various modifications can be made to the composition and purification method for purifying turbid circulating water provided by the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A composition for purifying turbid circulating water, characterized in that, include, Converter dust, electric furnace dust, iron oxide scale, ferrous sulfate, surfactants, polymeric coagulants, sodium sulfate, polyacrylamide, and sodium polyepoxysuccinate; among which, It is prepared from the following components according to parts by weight: The composition includes: 600-700 parts converter dust, 50-120 parts electric furnace dust, 100-150 parts iron oxide scale, 30-50 parts ferrous sulfate, 20 parts surfactant, 20-30 parts polymeric coagulant, 30 parts sodium sulfate, 10-15 parts polyacrylamide, and 10-15 parts sodium polyepoxysuccinate; and... The polymeric coagulant is any one of sodium carboxymethyl cellulose, chitosan, sodium alginate, starch coagulant, polyacrylamide, sodium polyacrylate, or polydimethyldiallyl ammonium chloride; the surfactant is any one of sodium lignosulfonate, alkyl sulfonate, calcium lignosulfonate, quaternary ammonium salt surfactant, polyoxyethylene surfactant, or propylene alcohol polyoxyethylene ether.

2. A method for purifying turbid circulating water, using the composition for purifying turbid circulating water according to claim 1, characterized in that, The methods include, The components of the composition used to purify turbid circulating water are thoroughly mixed; The mixed composition for purifying turbid circulating water is added to a pressurized integrated wastewater purification device; The pressurized integrated wastewater purification device is used to purify turbid circulating water.

3. The purification method for turbid circulating water according to claim 2, characterized in that, The method of thoroughly mixing the components of the composition for purifying turbid circulating water; and adding the mixed composition for purifying turbid circulating water to a pressurized integrated wastewater purification device includes, The components of the composition for purifying turbid circulating water are contacted and mixed in a stirred reactor for 2 hours to obtain a homogenized composition for purifying turbid circulating water. The mixed composition for purifying turbid circulating water is added into the suction well of the cyclone pool through a screw metering device and thoroughly mixed with the turbid circulating water to be purified. The mixed composition for purifying turbid circulating water is fed into the pressurized integrated wastewater purification device along with the turbid circulating water to be purified.

4. The purification method for turbid circulating water according to claim 2, characterized in that, The method of thoroughly mixing the components of the composition for purifying turbid circulating water; and adding the mixed composition for purifying turbid circulating water to a pressurized integrated wastewater purification device includes, The components of the composition for purifying turbid circulating water are continuously stirred with water in a stirred reactor to form a suspension of the composition for purifying turbid circulating water. The suspension of the composition used to purify turbid circulating water is fed into the inlet pipe of the pressurized integrated sewage purification device through a metering pump.

5. The purification method for turbid circulating water according to claim 2, characterized in that, The steps for purifying circulating water using the aforementioned pressurized integrated wastewater purification device include: The composition for purifying turbid circulating water enters the cyclone sedimentation chamber tangentially through the inlet pipe to remove large solid particulate impurities by utilizing cyclone sedimentation. The turbid circulating water after cyclone sedimentation is introduced into the primary flocculation reaction chamber for primary flocculation reaction; The turbid circulating water after the primary flocculation reaction is introduced into the secondary sedimentation chamber for secondary sedimentation and separation. The turbid circulating water that has undergone secondary sedimentation and classification is introduced into the secondary flocculation reaction chamber for secondary flocculation reaction to increase the size of the flocs; The turbid circulating water after the secondary flocculation reaction is injected into the hydraulic circulation clarification chamber through a nozzle for clarification. The clarified water is fed into the inclined tube three-stage sedimentation zone for sedimentation and concentration.

6. The method for purifying turbid circulating water according to claim 5, characterized in that, The clean water produced after the turbid circulating water is purified by the pressurized integrated sewage purification device is transported to the cooling tower. The sludge produced after the turbid circulating water is purified by the pressurized integrated sewage purification device is transported to a filter press to form a sludge cake.

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