Advanced treatment system for steel industry wastewater
By combining components such as equalization tanks, multi-stage sedimentation, filtration, and reverse osmosis, the problems of low reuse rate and equipment corrosion in the treatment of wastewater in the steel industry have been solved, achieving efficient water quality improvement and sustainable wastewater treatment with significant energy-saving and emission-reduction effects.
Patent Information
- Application Number
- CN202520030929.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing wastewater treatment systems in the steel industry suffer from problems such as low reuse rates, equipment corrosion, high operating costs, and equipment malfunctions. Moreover, their treatment effects are unsatisfactory, failing to effectively remove iron, manganese ions, and large molecular organic matter.
The system employs a combination of components such as equalization tanks, multi-stage sedimentation structures, multi-stage filtration structures, single-stage reverse osmosis structures, and cation and anion exchange structures. It achieves advanced wastewater treatment through the combination of mechanical bar screens, flocculation reaction tanks, horizontal flow sedimentation tanks, air flotation tanks, multi-media filters, submerged ultrafiltration devices, reverse osmosis membranes, and cation and anion exchange beds.
It has improved the quantity and quality of recycled water, achieved economic sustainability and energy conservation and emission reduction effects. Sludge and concentrated water can be disposed of within the steel enterprise, soft water and demineralized water can be used for high-end users, and concentrated water can be used for blast furnace slag flushing, which has significantly improved the treatment effect.
Smart Images
Figure CN223722972U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of steel industry wastewater treatment, specifically, the utility model relates to a steel industry wastewater advanced treatment system. BACKGROUND
[0002] At present, most steel enterprises still stay in the stage of reaching the standard discharge or simple treatment and reuse, and the treatment process for the purpose of reaching the standard discharge or simple reuse is generally coagulation, sedimentation, filtration, reaching the standard discharge or reclaimed water reuse, some enterprises utilize the reclaimed water as raw water to further carry out ultrafiltration reverse osmosis depth treatment, and the treated water is used as circulating water supplement water, but due to improper selection of the treatment process, a series of problems are caused: the reuse rate of some enterprises is not high, the reuse of some enterprises causes equipment and pipe network corrosion, the depth treatment equipment of some enterprises is paralyzed and has poor operation condition, some enterprises adopt multi-stage reverse osmosis, the operation cost is relatively high, and the sustainability of the project is poor.
[0003] In order to solve the above problems, the patent document 204779237U discloses a steel industry wastewater reuse treatment system, which comprises a wastewater pretreatment system and an advanced treatment system; the pretreatment system is composed of a mechanical grille, a spiral lifting pump, a first sedimentation tank, a second sedimentation tank and a lifting pump station which are sequentially connected, the advanced treatment system is composed of a hydrolysis acidification tank, a coagulation air flotation tank, a secondary biological filter tank, a V-shaped filter tank, a disinfection tank, a reused water tank and a reused water pump station which are sequentially connected, and the bottom of the first sedimentation tank, the second sedimentation tank, the hydrolysis acidification tank and the coagulation air flotation tank is additionally connected with a sludge thickening tank, but the above problems cannot be solved. CONTENT
[0004] The utility model is carried out in order to solve the above problems, and aims at providing a steel industry wastewater advanced treatment system which has large water quantity and good water quality, good economic sustainability, remarkable energy saving and emission reduction effect and can effectively remove iron ions, manganese ions and macromolecular organic matters in reused water, in order to realize the above purpose, the utility model adopts the technical scheme that:
[0005] The utility model provides a kind of steel industry wastewater advanced treatment system, with such characteristics, including regulating pool, multistage sedimentation structure, multistage filtration structure, first reverse osmosis structure and yin and yang particle exchange structure, regulating pool, multistage sedimentation structure, multistage filtration structure, first reverse osmosis structure and yin and yang particle exchange structure are sequentially connected.
[0006] In the steel industry wastewater advanced treatment system provided by the utility model, the inlet side of the regulating pool can be provided with a mechanical grille.
[0007] The steel industrial wastewater deep treatment system has the characteristics that the multi-stage sedimentation structure comprises a flocculation reaction tank, a horizontal flow sedimentation tank and an air flotation tank, the flocculation reaction tank is connected with the adjusting tank, one side of the horizontal flow sedimentation tank is connected with the flocculation reaction tank, and one side of the horizontal flow sedimentation tank is connected with the air flotation tank.
[0008] The steel industrial wastewater deep treatment system has the characteristics that the horizontal flow sedimentation tank is connected with a concentration tank, the concentration tank is connected with a plate-and-frame filter press, and the concentration tank and the plate-and-frame filter press are connected with the adjusting tank through a first backflow pipeline.
[0009] The steel industrial wastewater deep treatment system has the characteristics that the multi-stage filtration structure comprises a multi-medium filter, a self-cleaning filter, an immersed ultrafilter and a safety filter, the multi-medium filter, the self-cleaning filter, the immersed ultrafilter and the safety filter are sequentially connected, and the multi-medium filter is connected with the air flotation tank.
[0010] The steel industrial wastewater deep treatment system has the characteristics that the immersed ultrafilter is connected with the multi-medium filter through a second backflow pipeline.
[0011] The steel industrial wastewater deep treatment system has the characteristics that the multi-medium filter, the self-cleaning filter and the immersed ultrafilter are connected with the adjusting tank through a third backflow pipeline.
[0012] The steel industrial wastewater deep treatment system has the characteristics that the cation-anion particle exchange structure comprises a cation bed, a decarbonization tower, an anion bed and a desalted water tank, the cation bed, the decarbonization tower, the anion bed and the desalted water tank are sequentially connected, and the cation bed and the anion bed are connected with a neutralization tank.
[0013] The steel industrial wastewater deep treatment system has the characteristics that the neutralization tank is connected with the adjusting tank through a fourth backflow pipeline.
[0014] The steel industrial wastewater deep treatment system has the characteristics that the desalted water tank is connected with the cation bed and the anion bed through a fifth backflow pipeline.
[0015] The technical effect of the steel industrial wastewater advanced treatment system is: the steel industrial wastewater advanced treatment system provided by the utility model includes an adjusting tank, a multi-stage sedimentation structure, a multi-stage filtration structure, a first reverse osmosis structure and a positive and negative particle exchange structure, the adjusting tank, the multi-stage sedimentation structure, the multi-stage filtration structure, the first reverse osmosis structure and the positive and negative particle exchange structure are sequentially connected, the steel wastewater sequentially passes through the adjusting tank, the multi-stage sedimentation structure, the multi-stage filtration structure, the first reverse osmosis structure and the positive and negative particle exchange structure, the produced soft water and desalted water are used for high-end user water of the steel enterprise itself, the produced sludge is used for a sintering system, the produced concentrated water is used for a blast furnace water slag flushing and a steel slag hot steaming process, the recyclable water amount and the recycled water quality are effectively improved, the produced sludge and concentrated water can also be self-consumed in the steel enterprise, the economic sustainability of the project is better, and the energy-saving and emission-reducing effect is remarkable.
[0016] Therefore, the steel industrial wastewater advanced treatment system provided by the utility model has large recycled water amount and good water quality, good economic sustainability and remarkable energy-saving and emission-reducing effect. BRIEF DESCRIPTION OF DRAWINGS
[0017] The present specification includes the following drawings, and the shown contents are respectively:
[0018] Figure 1 is a system structure schematic view of the steel industrial wastewater advanced treatment system in the embodiment of the utility model.
[0019] Marked in the figure: adjusting tank-10, mechanical grid-11, multi-stage sedimentation structure-20, flocculation reaction tank-21, horizontal flow sedimentation tank-22, air flotation tank-23, concentration tank-24, plate and frame filter press-25, first backflow pipeline-26, multi-stage filtration structure-30, multi-media filter-31, self-cleaning filter-32, submerged ultrafilter-33, security filter-34, second backflow pipeline-35, third backflow pipeline-36, first reverse osmosis structure-40, positive and negative particle exchange structure-50, positive bed-51, decarbonization tower-52, negative bed-53, desalted water tank-54, neutralization tank-55, fourth backflow pipeline-56, fifth backflow pipeline-57. DETAILED DESCRIPTION
[0020] The specific embodiments of the present application are further described below with reference to the drawings, and the purpose is to help the skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present application, and to help its implementation.
[0021] Figure 1 is a system structure schematic view of the steel industrial wastewater advanced treatment system in the embodiment of the utility model.
[0022] As Figure 1As shown, the steel industrial wastewater advanced treatment system provided by the utility model includes an adjusting tank 10, a multi-stage sedimentation structure 20, a multi-stage filtration structure 30, a primary reverse osmosis structure 40 and a positive and negative particle exchange structure 50, the adjusting tank 10, the multi-stage sedimentation structure 20, the multi-stage filtration structure 30, the primary reverse osmosis structure 40 and the positive and negative particle exchange structure 50 are sequentially connected, the steel industrial wastewater sequentially passes through the adjusting tank 10, the multi-stage sedimentation structure 20, the multi-stage filtration structure 30, the primary reverse osmosis structure 40 and the positive and negative particle exchange structure 50, the produced soft water and desalted water are used for the high-end user water of the steel enterprise itself, the produced sludge is used for a sintering system, the produced concentrated water is used for a blast furnace water slag flushing and a steel slag hot steaming process, the recyclable water amount and the recycled water quality are effectively improved, the produced sludge and concentrated water can also be self-consumed in the steel enterprise, the economic sustainability of the project is better, and the energy-saving and emission-reducing effect is remarkable.
[0023] The inlet side of the adjusting tank 10 into which the steel industrial wastewater flows is provided with a mechanical grille 11, the mechanical grille 11 can remove floating sundries in the steel industrial wastewater, the mechanical grille 11 adopts a rotary grille cleaner, the grille gap is 6mm, the grille installation angle is 60°-80°, the steel industrial wastewater from which the floating sundries are removed by the mechanical grille 11 flows into the adjusting tank 10, and the adjusting tank 10 is used for adjusting the flow of the steel industrial wastewater in the steel industrial wastewater advanced treatment system.
[0024] The multi-stage sedimentation structure 20 includes a flocculation reaction tank 21, a horizontal flow sedimentation tank 22 and a flotation tank 23, the flocculation reaction tank 21 is connected with the adjusting tank 10, the steel industrial wastewater in the adjusting tank 10 enters the flocculation reaction tank 21 after being pressurized, flocculation sedimentation is that after a coagulant is added into water, colloids and dispersed particles of suspended matters generate flocculation bodies under the interaction of molecular forces, they collide and coagulate in the sedimentation process, the size and mass are continuously increased, and the sedimentation speed is continuously increased, and the flocculation sedimentation time is controlled within 6min-8min.
[0025] The steel industrial wastewater treated by the flocculation reaction tank 21 enters the horizontal flow sedimentation tank 22 through a water distribution flower wall, horizontal flow sedimentation refers to that the raw water to which a coagulant is added flows horizontally in a rectangular tank from an inlet to an outlet, and flocculation particles are removed, the horizontal flow sedimentation tank 22 is in a rectangular shape, the wastewater flows into one end of the horizontal flow sedimentation tank 22, flows through the horizontal flow sedimentation tank 22 in a horizontal direction, and flows out of the other end of the horizontal flow sedimentation tank 22, the surface load of the horizontal flow sedimentation tank 22 is 4m 3 / (m 2 ·h), the hydraulic retention time is not less than 1h, thereby effectively removing the suspended matters and dispersed particles in the steel industrial wastewater, and making the suspended matters and dispersed particles form sludge by sedimentation.
[0026] The steel industrial wastewater treated by the horizontal flow sedimentation tank 22 enters the air flotation tank 23. The air flotation tank 23 mainly uses a large number of micro-bubbles to capture and adsorb fine particles of gluey substances to make them float, so as to achieve the effect of solid-liquid separation, and can effectively remove the oil in the steel industrial wastewater. The air flotation tank 23 adopts a dissolved air flotation mode, the particle size of the air flotation micro-bubbles is controlled within 15 μm-30 μm, the surface load of the air flotation tank is about 4 m 3 / (m 2 ·h), and the oil content of the steel industrial wastewater treated by the air flotation tank 23 is less than 1 mg / L.
[0027] The horizontal flow sedimentation tank 22 is connected with a thickening tank 24, and the thickening tank 24 is connected with a plate-frame filter press 25. The sludge formed in the horizontal flow sedimentation tank 22 is discharged into the thickening tank 24, and the float dregs floated in the air flotation tank 23 are also discharged into the thickening tank 24. The sludge and the float dregs are further thickened to obtain supernatant and thickened sludge and float dregs. The thickened sludge and float dregs are further pressure-filtered by the plate-frame filter press 25 to obtain filtrate and dewatered sludge. The dewatered sludge is sent back to the steel enterprise for sintering and reuse. The thickening tank 24 and the plate-frame filter press 25 are connected with the conditioning tank 10 through a first backflow pipeline 26, so that the supernatant and the filtrate can be backflowed into the conditioning tank 10 for further treatment, thereby improving the treatment effect of the steel industrial wastewater.
[0028] The multi-stage filtration structure 30 includes a multi-medium filter 31, a self-cleaning filter 32, an immersed ultrafilter 33 and a security filter 34, which are connected in sequence.
[0029] The multi-medium filter 31 is connected with the air flotation tank 23. The steel industrial wastewater treated by the air flotation tank 23 is pressurized and then sent into the multi-medium filter 31. The multi-medium filter 31 is filled with goose pebbles, refined manganese sand, quartz sand and anthracite from top to bottom in sequence. The goose pebbles, the refined manganese sand, the quartz sand and the anthracite are stacked in sequence in a circulating manner. The thickness of the refined manganese sand is within 0.6 mm-4 mm, the thickness of the quartz sand is within 0.5 mm-1.2 mm, and the thickness of the anthracite is within 0.8 mm-1.8 mm. The total filling height is not less than 1800 mm. The treatment capacity of the multi-medium filter 31 is less than or equal to 10 m 3 / (m 2 ·h). The backwashing of the multi-medium filter 31 adopts air-water backwashing, and the backwashing drainage is returned to the conditioning tank 10.
[0030] The steel industrial wastewater treated by the multi-medium filter 31 enters the self-cleaning filter 32 for full filtration. The self-cleaning filter 32 can prevent the multi-medium filter 31 from leaking and avoid affecting the safety of the ultrafiltration membrane in the immersed ultrafilter 33, thereby improving the service life and reliability of the multi-stage filtration structure 30.
[0031] The steel industrial wastewater treated by the self-cleaning filter 32 enters the submerged ultrafilter 33, is branched into a plurality of submerged ultrafilter membrane pools, and is subjected to primary membrane separation. The submerged ultrafilter 33 has a water recovery rate of greater than or equal to 90% (at 10°C), a colloidal silica removal rate of greater than or equal to 99% (at 10°C), and a water production SDI (Silt Density Index) of less than or equal to 3. The pore size of the submerged ultrafilter membrane in the submerged ultrafilter 33 is required to be between 0.02 μm and 0.08 μm, and the design membrane flux is less than or equal to 30 L / (m 2 ·h)
[0032] The steel industrial wastewater treated by the submerged ultrafilter 33 enters the security filter 34. The security filter 34 is a filter cartridge type filter, uses a large-flow folding PP filter cartridge, and has a filtration accuracy of 5 μm.
[0033] The submerged ultrafilter 33 is connected to the multi-medium filter 31 through a second backflow pipeline 35, so that the wastewater treated by the submerged ultrafilter 33 can be used for backwashing of the multi-medium filter 31.
[0034] The multi-medium filter 31, the self-cleaning filter 32, and the submerged ultrafilter 33 are connected to the conditioning tank 10 through a third backflow pipeline 36, so that the sewage produced by backwashing in the multi-medium filter 31, the sewage produced by backwashing in the self-cleaning filter 32, and the concentrated water produced in the submerged ultrafilter 33 can be backflowed into the conditioning tank 10 for further treatment, thereby improving the steel industrial wastewater treatment effect.
[0035] The steel industrial wastewater treated by the security filter 34 enters the primary reverse osmosis structure 40. The primary reverse osmosis structure 40 uses a high desalination rate reverse osmosis membrane, has a desalination rate of greater than or equal to 99.5%, and has a membrane flux of between 16 LMH and 18 LMH. The primary reverse osmosis structure 40 is arranged in two stages and adopts a segmented water taking and recycling mode. The water quality of the first stage is good, the total hardness (calculated as CaCO) is less than 5 mg / L, and the water can be directly stored in a soft water tank and sent to a soft water user. The second stage and the surplus water of the first stage are mixed and stored in a reverse osmosis water tank. The concentrated water produced in the third stage is sent to a blast furnace water slag flushing or a steel slag hot leaching.
[0036] The wastewater in the reverse osmosis water tank enters the cation and anion exchange structure 50. The cation and anion exchange structure 50 includes a cation bed 51, a decarbonization tower 52, an anion bed 53, and a desalted water tank 54, which are connected in sequence. The cation bed 51 and the anion bed 53 are connected with a neutralization tank 55. The wastewater in the reverse osmosis water tank flows through the cation bed 51, the decarbonization tower 52, and the anion bed 53 in sequence for desalination. The desalted water is stored in the desalted water tank 54, and the primary desalted water is used for a steel enterprise primary desalted water user.
[0037] The neutralization tank 55 is connected with the adjusting tank 10 through the fourth reflux pipeline 56, the desalted water tank is connected with the cation bed 51 and the anion bed 53 through the fifth reflux pipeline 57, the primary desalted water in the desalted water tank 54 is refluxed into the cation bed 51 and the anion bed 53 through the fifth reflux pipeline 57 and is used for acid-base regeneration of the cation bed 51 and the anion bed 53, the regenerated water of the cation bed 51 and the anion bed 53 flows into the neutralization tank 55, and after neutralization, is refluxed into the adjusting tank 10 through the fourth reflux pipeline 56, so that the deionization effect of the cation bed 51 and the anion bed 53 can be kept effective, and the desalination effect is improved.
[0038] Compared with the traditional wastewater treatment system and process, the steel industrial wastewater advanced treatment system provided by the utility model has a more optimized treatment process and higher quality of recycled water, wherein the soft water and the primary desalted water can be directly used as water for high-quality users such as a soft water closed circulating water system and a waste heat boiler of a steel enterprise, and the sludge after treatment can be used for sintering recycling, and the concentrated water after reduction can be used for blast furnace water slag flushing and water supplement, so that the recycling is realized without external discharge. The steel industrial wastewater advanced treatment system provided by the utility model further comprises a flotation tank 23, so that the continuous operation of the submerged ultrafilter 33 in the subsequent treatment process is ensured without pollution and blockage. The steel industrial wastewater advanced treatment system provided by the utility model is further characterized by the high content of iron and manganese in the wastewater of the steel enterprise and the addition of a series of high molecular flocculants in the front end coagulation and sedimentation, and a multi-medium filter with refined manganese sand, quartz sand and anthracite as combined filter materials is adopted, so that the iron, manganese ions and macromolecular organic matters in the wastewater are better removed, and the service time and service life of the subsequent submerged ultrafiltration membrane are improved.
[0039] Effects of the embodiment
[0040] The steel industrial wastewater advanced treatment system comprises an adjusting tank 10, a multi-stage sedimentation structure 20, a multi-stage filtration structure 30, a primary reverse osmosis structure 40 and an anion-cation particle exchange structure 50, the adjusting tank 10, the multi-stage sedimentation structure 20, the multi-stage filtration structure 30, the primary reverse osmosis structure 40 and the anion-cation particle exchange structure 50 are sequentially connected, and steel industrial wastewater sequentially passes through the adjusting tank 10, the multi-stage sedimentation structure 20, the multi-stage filtration structure 30, the primary reverse osmosis structure 40 and the anion-cation particle exchange structure 50, the produced soft water and desalted water are recycled for high-end user water of the steel enterprise itself, the produced sludge is recycled for a sintering system, and the produced concentrated water is used for blast furnace water slag flushing and steel slag hot leaching slag process, so that the recyclable water amount and the recycled water quality are effectively improved, the produced sludge and concentrated water can be self-consumed in the steel enterprise, the economic sustainability of the project is better, the energy-saving and emission-reducing effect is remarkable, the steel industrial wastewater advanced treatment system provided by the utility model has a large amount of recycled water and good water quality, good economic sustainability and remarkable energy-saving and emission-reducing effect.
[0041] The utility model has been described above in conjunction with the drawings. Obviously, the utility model is not limited by the above-mentioned mode in its specific implementation. As long as various non-essential improvements are made using the method concept and technical solution of the utility model; or without improvement, the above-mentioned concept and technical solution of the utility model are directly applied to other occasions, which are within the protection scope of the utility model.
Claims
1. A steel industry wastewater advanced treatment system, characterized by, It comprises a regulating pool (10), a multi-stage precipitation structure (20), a multi-stage filtration structure (30), a primary reverse osmosis structure (40) and a positive and negative particle exchange structure (50), which are connected in sequence.
2. The steel industry wastewater advanced treatment system according to claim 1, characterized by, The regulating pool (10) is provided with a mechanical grille (11) on the inlet side.
3. The steel industry wastewater advanced treatment system according to claim 1, characterized by, The multi-stage precipitation structure (20) comprises a flocculation reaction pool (21), a horizontal flow sedimentation pool (22) and a flotation pool (23), the flocculation reaction pool (21) is connected with the regulating pool (10), one side of the horizontal flow sedimentation pool (22) is connected with the flocculation reaction pool (21), and one side of the horizontal flow sedimentation pool (22) is connected with the flotation pool (23).
4. The steel industry wastewater advanced treatment system according to claim 3, characterized by, The horizontal flow sedimentation pool (22) is connected with a concentration pool (24), the concentration pool (24) is connected with a plate-and-frame filter press (25), and the concentration pool (24) and the plate-and-frame filter press (25) are connected with the regulating pool (10) through a first backflow pipeline (26).
5. The steel industry wastewater advanced treatment system according to claim 3, characterized by, The multi-stage filtration structure (30) comprises a multi-medium filter (31), a self-cleaning filter (32), an immersed ultrafilter (33) and a security filter (34), which are connected in sequence, and the multi-medium filter (31) is connected with the flotation pool (23).
6. The steel industry wastewater advanced treatment system according to claim 5, characterized by, The immersed ultrafilter (33) is connected with the multi-medium filter (31) through a second backflow pipeline (35).
7. The steel industry wastewater advanced treatment system according to claim 6, characterized by, The multi-medium filter (31), the self-cleaning filter (32) and the immersed ultrafilter (33) are connected with the regulating pool (10) through a third backflow pipeline (36).
8. The steel industry wastewater advanced treatment system according to claim 7, characterized by, The positive and negative particle exchange structure (50) comprises a positive bed (51), a decarbonization tower (52), a negative bed (53) and a desalted water pool (54), which are connected in sequence, and the positive bed (51) and the negative bed (53) are connected with a neutralization pool (55).
9. The steel industry wastewater advanced treatment system according to claim 8, characterized by, The neutralization pool (55) is connected with the regulating pool (10) through a fourth backflow pipeline (56).
10. The steel industry wastewater advanced treatment system according to claim 9, characterized by, The desalted water pool (54) is connected with the positive bed (51) and the negative bed (53) through a fifth backflow pipeline (57).