CN110818205A - System and process for reducing concentration of pollutants in steel comprehensive wastewater - Google Patents
System and process for reducing concentration of pollutants in steel comprehensive wastewater Download PDFInfo
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention relates to a system and a process for reducing the concentration of pollutants in steel and iron comprehensive wastewater, wherein the system comprises a regulating tank, a high-density sedimentation tank, a biological aerated filter, a denitrification biological filter, a high-efficiency dissolved air flotation tank, a filter and an ozone catalytic oxidation tank which are sequentially connected through a wastewater pipeline; the invention can thoroughly convert pollutants in the wastewater into non-pollutants, achieves the aim of reducing the concentration of the pollutants, meets the requirements on the special discharge limit of the water pollutants in Table 3 of the discharge standard GB13456-2012 of the pollutants for the water in the iron and steel industry, and completely meets the water quality index of the inlet water for the desalting and recycling by the double-membrane method, thereby prolonging the service life of the desalting and recycling facility.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a system and a process for reducing the concentration of pollutants in steel comprehensive wastewater.
Background
Steel enterprises are large water consumers, and produce large-scale production wastewater, and indexes such as SS, COD, ammonia nitrogen, total nitrogen, fluoride, cyanide and the like in the wastewater are easy to exceed standards and cannot be directly discharged. The industrial wastewater is desalted and recycled, but the method does not remove the pollutants, but transfers the pollutants into the strong brine, and the strong brine is reused to cause secondary pollution. In addition, the double-membrane desalination has strict requirements on inlet water, the inlet water quality is good, and the service life of the desalination equipment can be greatly prolonged. Therefore, it is preferable to reduce the concentration of the pollutants before the wastewater enters the double-membrane desalination system.
Disclosure of Invention
The invention provides a system and a process for reducing the concentration of pollutants in comprehensive steel wastewater, which can thoroughly convert pollutants in the wastewater into non-pollutants, achieve the purpose of reducing the concentration of the pollutants, meet the requirements of special discharge limit values of water pollutants in Table 3 of the discharge standard GB13456-2012 of pollutants for water in the steel industry, and completely meet the water quality index of inlet water for desalting and recycling by a double-membrane method, so as to prolong the service life of desalting and recycling facilities.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for reducing the concentration of pollutants in steel and iron comprehensive wastewater comprises a regulating tank, a high-density sedimentation tank, an aeration biological filter, a denitrification biological filter, a high-efficiency dissolved air flotation tank, a filter and an ozone catalytic oxidation tank which are sequentially connected through a wastewater pipeline; wherein:
a liftable aerator is arranged in the regulating tank;
the high-density sedimentation tank is provided with a drug feeding device and a sediment discharge port which is connected with a sludge treatment system through a pipeline;
a fixed aerator is arranged in the biological aerated filter and is connected with an air suspension fan through a pipeline;
the denitrification biological filter is provided with an inert gas inlet and a carbon source adding device; the bottom of the denitrification biological filter is provided with a water inlet, the upper part of the denitrification biological filter is provided with a water outlet, and the filter body is internally provided with at least 2 filter layers which comprise an aerobic bacteria inhibition layer arranged on the lower layer and a denitrification layer arranged on the upper layer;
a pipe reactor is arranged on a wastewater pipeline at the upstream of the high-efficiency dissolved air floatation tank, and the pipe reactor is provided with a phosphorus removing agent adding port and a flocculating agent adding port; the high-efficiency dissolved air flotation tank is sequentially divided into a water inlet area, a water distribution area and a separation area along the water flow direction, the water inlet of the water inlet area is connected with the water outlet of the tubular reactor, and the water inlet area is provided with an air flotation device; the top of the water distribution area is provided with a slag scraper, the lower part of the water distribution area is provided with a corrugated inclined plate, and the bottom of the water distribution area is provided with a sludge discharge port; the bottom of the separation area is provided with a mud scraper and an automatic mud valve; the residue scraper is connected with the sludge treatment system through a residue discharge groove, the sludge scraper is connected with the sludge treatment system through a sludge discharge pipeline, and an automatic sludge discharge valve is arranged on the sludge discharge pipeline.
And a heating device is also arranged in the regulating tank, and the heating device is an electric heating device or a steam heating device.
The medicine adding device in the high-density sedimentation tank is one or more of a lime adding device, a calcium chloride adding device, a sodium carbonate adding device, a sodium bicarbonate adding device, a PAC adding device and a PAM adding device.
The air suspension fan is controlled by adopting frequency conversion.
The air supporting device is composed of a dissolved air tank, a circulating pump and a releaser, an air inlet, a circulating water inlet and a dissolved air water outlet are arranged on the dissolved air tank, the circulating water inlet is connected with a circulating water outlet in a water inlet area through a circulating water pipeline, the circulating pump is arranged on the circulating water pipeline, and the dissolved air water outlet is connected with the releaser in the water inlet area.
The filter is a sand filter or a V-shaped filter.
A back washing water outlet is arranged on a waste water pipeline at the downstream of the filter pool, and the back washing water outlet is respectively connected with the biological aerated filter, the biological denitrification filter and a back washing water inlet of the filter pool through back washing water pipelines; the aeration biological filter, the denitrification biological filter and the filter are respectively provided with a backwashing water outlet and are connected with the regulating tank through a backwashing water drainage pipeline.
A process for reducing the concentration of pollutants in steel comprehensive wastewater comprises the following steps:
1) the method comprises the following steps that (1) steel comprehensive wastewater firstly enters an adjusting tank, and the adjusting tank is used for adjusting water quantity, balancing water quality and preventing sludge from precipitating; the waste water is oxygenated by aeration, and the ferrous iron in the waste water is oxidized into ferric iron so as to remove the total iron by adding lime into a subsequent high-density sedimentation tank to form ferric hydroxide sediment, thereby meeting the requirements of desalting and recycling the waste water; heating the wastewater in the adjusting tank according to the requirement, and avoiding the influence on the subsequent biochemical treatment effect and the double-membrane desalination water yield due to the over-low water temperature;
2) the effluent of the regulating tank enters a high-density sedimentation tank; in the high-density sedimentation tank, medicaments are added according to the water quality condition of the wastewater, and the method comprises the steps of adding lime to remove hardness so as to meet the requirements of desalting and recycling the wastewater; lime and calcium chloride are added to remove fluoride, so that the standard reaching requirement of the fluoride in the effluent is met; adding sodium carbonate or sodium bicarbonate to supplement alkalinity so as to meet the alkalinity required by ammoniation reaction and the alkalinity requirement in the subsequent ammonia nitrogen removal; PAC and PAM are added to form floc so as to remove SS; sludge generated by the high-density sedimentation tank enters a sludge treatment system for treatment;
3) the effluent of the high-density sedimentation tank enters an aeration biological filter; removing COD in the wastewater in the biological aerated filter, and converting ammonia nitrogen into nitrate;
4) the effluent of the aeration biological filter enters a denitrification biological filter; the denitrification biological filter adopts an upward water outlet mode, wastewater firstly passes through the aerobic bacteria inhibition layer to reduce DO, and then passes through the denitrification layer; when the wastewater passes through the denitrification layer, an external carbon source is taken as an electron donor to perform denitrification reaction, so that nitrate is converted into nitrogen to be discharged; adding inert gas to expand the filter material, and allowing aged sludge generated by organisms to flow out along water flow;
5) the effluent of the denitrification biological filter enters a high-efficiency dissolved air flotation tank; the wastewater firstly enters a tubular reactor, and a phosphorus removing agent and a flocculating agent are added into the tubular reactor to enable impurities in the wastewater to form separable flocculates; after the wastewater enters the water inlet area, the flocculate is contacted with bubbles with the diameter of 30-50 um released in the dissolved air to form a low-density 'air floating body', oil and suspended matters in the wastewater are removed at the same time, the flocculate is coalesced into scum in the water distribution area, and the scum is scraped to a scum collecting tank through a scum scraper and then automatically flows and is discharged into a sludge treatment system; the flocs with lower ascending speed and water flow downwards to be further coalesced through the corrugated inclined plate, the flocs with low density float to the water surface, the flocs with high density precipitate to the bottom, and sand deposited in the water distribution area is discharged through a sand discharge port; the silt precipitated in the water inlet area and the sludge precipitated at the bottom of the separation area are scraped to a sludge discharge end by a sludge scraper and are periodically and quantitatively discharged into a sludge treatment system through an automatic sludge discharge valve;
6) the water discharged from the high-efficiency dissolved air floatation tank enters a filter tank to remove suspended matters and reduce turbidity;
7) the effluent of the filter tank enters an ozone catalytic oxidation tank, part of COD in the wastewater is degraded in a high-density sedimentation tank and an aeration biofiltration tank, and the rest part of the COD is removed in the ozone catalytic oxidation tank; the COD and BOD in the wastewater can be ensured to reach the standard through the ozone catalytic oxidation tank, and the COD of the effluent of the system is less than or equal to 30 mg/L.
As a pretreatment process of the double-membrane desalting process, the effluent of the system enters a double-membrane desalting system, and the step 5) is omitted or the effluent of the denitrification biological filter is directly sent to a subsequent treatment device through an overtaking pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1) the process and the system are reasonable in arrangement, can adapt to the quality of the steel comprehensive wastewater, and can simultaneously remove SS, COD, ammonia nitrogen, total nitrogen, fluoride, hardness, turbidity, chromaticity, total iron, oil and other pollutants in the wastewater.
2) The treated wastewater can meet the requirements of special emission limit index indexes of water pollutants in Table 3 of the discharge standard GB13456-2012 of pollutants for water in the iron and steel industry, and can be used as a pretreatment process for desalting by a double-membrane method;
3) the removal rate of pollutants in the wastewater is greatly improved, the removal rate of ammonia nitrogen can reach more than 95%, the removal rate of COD can reach more than 90%, and the removal rate of total nitrogen can reach more than 90%.
Drawings
FIG. 1 is a schematic structural diagram of a system for reducing the pollutant concentration in integrated steel wastewater according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in figure 1, the system for reducing the concentration of pollutants in the comprehensive wastewater of steel comprises a regulating tank, a high-density sedimentation tank, a biological aerated filter, a biological denitrification filter, a high-efficiency dissolved air flotation tank, a filter and an ozone catalytic oxidation tank which are sequentially connected through a wastewater pipeline; wherein:
a liftable aerator is arranged in the regulating tank;
the high-density sedimentation tank is provided with a drug feeding device and a sediment discharge port which is connected with a sludge treatment system through a pipeline;
a fixed aerator is arranged in the biological aerated filter and is connected with an air suspension fan through a pipeline;
the denitrification biological filter is provided with an inert gas inlet and a carbon source adding device; the bottom of the denitrification biological filter is provided with a water inlet, the upper part of the denitrification biological filter is provided with a water outlet, and the filter body is internally provided with at least 2 filter layers which comprise an aerobic bacteria inhibition layer arranged on the lower layer and a denitrification layer arranged on the upper layer;
a pipe reactor is arranged on a wastewater pipeline at the upstream of the high-efficiency dissolved air floatation tank, and the pipe reactor is provided with a phosphorus removing agent adding port and a flocculating agent adding port; the high-efficiency dissolved air flotation tank is sequentially divided into a water inlet area, a water distribution area and a separation area along the water flow direction, the water inlet of the water inlet area is connected with the water outlet of the tubular reactor, and the water inlet area is provided with an air flotation device; the top of the water distribution area is provided with a slag scraper, the lower part of the water distribution area is provided with a corrugated inclined plate, and the bottom of the water distribution area is provided with a sludge discharge port; the bottom of the separation area is provided with a mud scraper and an automatic mud valve; the residue scraper is connected with the sludge treatment system through a residue discharge groove, the sludge scraper is connected with the sludge treatment system through a sludge discharge pipeline, and an automatic sludge discharge valve is arranged on the sludge discharge pipeline.
And a heating device is also arranged in the regulating tank, and the heating device is an electric heating device or a steam heating device.
The medicine adding device in the high-density sedimentation tank is one or more of a lime adding device, a calcium chloride adding device, a sodium carbonate adding device, a sodium bicarbonate adding device, a PAC adding device and a PAM adding device.
The air suspension fan is controlled by adopting frequency conversion.
The air supporting device is composed of a dissolved air tank, a circulating pump and a releaser, an air inlet, a circulating water inlet and a dissolved air water outlet are arranged on the dissolved air tank, the circulating water inlet is connected with a circulating water outlet in a water inlet area through a circulating water pipeline, the circulating pump is arranged on the circulating water pipeline, and the dissolved air water outlet is connected with the releaser in the water inlet area.
The filter is a sand filter or a V-shaped filter.
A back washing water outlet is arranged on a waste water pipeline at the downstream of the filter pool, and the back washing water outlet is respectively connected with the biological aerated filter, the biological denitrification filter and a back washing water inlet of the filter pool through back washing water pipelines; the aeration biological filter, the denitrification biological filter and the filter are respectively provided with a backwashing water outlet and are connected with the regulating tank through a backwashing water drainage pipeline.
A process for reducing the concentration of pollutants in steel comprehensive wastewater comprises the following steps:
1) the method comprises the following steps that (1) steel comprehensive wastewater firstly enters an adjusting tank, and the adjusting tank is used for adjusting water quantity, balancing water quality and preventing sludge from precipitating; the waste water is oxygenated by aeration, and the ferrous iron in the waste water is oxidized into ferric iron so as to remove the total iron by adding lime into a subsequent high-density sedimentation tank to form ferric hydroxide sediment, thereby meeting the requirements of desalting and recycling the waste water; heating the wastewater in the adjusting tank according to the requirement, and avoiding the influence on the subsequent biochemical treatment effect and the double-membrane desalination water yield due to the over-low water temperature;
2) the effluent of the regulating tank enters a high-density sedimentation tank; in the high-density sedimentation tank, medicaments are added according to the water quality condition of the wastewater, and the method comprises the steps of adding lime to remove hardness so as to meet the requirements of desalting and recycling the wastewater; lime and calcium chloride are added to remove fluoride, so that the standard reaching requirement of the fluoride in the effluent is met; adding sodium carbonate or sodium bicarbonate to supplement alkalinity so as to meet the alkalinity required by ammoniation reaction and the alkalinity requirement in the subsequent ammonia nitrogen removal; PAC and PAM are added to form floc so as to remove SS; sludge generated by the high-density sedimentation tank enters a sludge treatment system for treatment;
3) the effluent of the high-density sedimentation tank enters an aeration biological filter; removing COD in the wastewater in the biological aerated filter, and converting ammonia nitrogen into nitrate;
4) the effluent of the aeration biological filter enters a denitrification biological filter; the denitrification biological filter adopts an upward water outlet mode, wastewater firstly passes through the aerobic bacteria inhibition layer to reduce DO, and then passes through the denitrification layer; when the wastewater passes through the denitrification layer, an external carbon source is taken as an electron donor to perform denitrification reaction, so that nitrate is converted into nitrogen to be discharged; adding inert gas to expand the filter material, and allowing aged sludge generated by organisms to flow out along water flow;
5) the effluent of the denitrification biological filter enters a high-efficiency dissolved air flotation tank; the wastewater firstly enters a tubular reactor, and a phosphorus removing agent and a flocculating agent are added into the tubular reactor to enable impurities in the wastewater to form separable flocculates; after the wastewater enters the water inlet area, the flocculate is contacted with bubbles with the diameter of 30-50 um released in the dissolved air to form a low-density 'air floating body', oil and suspended matters in the wastewater are removed at the same time, the flocculate is coalesced into scum in the water distribution area, and the scum is scraped to a scum collecting tank through a scum scraper and then automatically flows and is discharged into a sludge treatment system; the flocs with lower ascending speed and water flow downwards to be further coalesced through the corrugated inclined plate, the flocs with low density float to the water surface, the flocs with high density precipitate to the bottom, and sand deposited in the water distribution area is discharged through a sand discharge port; the silt precipitated in the water inlet area and the sludge precipitated at the bottom of the separation area are scraped to a sludge discharge end by a sludge scraper and are periodically and quantitatively discharged into a sludge treatment system through an automatic sludge discharge valve;
6) the water discharged from the high-efficiency dissolved air floatation tank enters a filter tank to remove suspended matters and reduce turbidity;
7) the effluent of the filter tank enters an ozone catalytic oxidation tank, part of COD in the wastewater is degraded in a high-density sedimentation tank and an aeration biofiltration tank, and the rest part of the COD is removed in the ozone catalytic oxidation tank; the COD and BOD in the wastewater can be ensured to reach the standard through the ozone catalytic oxidation tank, and the COD of the effluent of the system is less than or equal to 30 mg/L.
As a pretreatment process of the double-membrane desalting process, the effluent of the system enters a double-membrane desalting system, and the step 5) is omitted or the effluent of the denitrification biological filter is directly sent to a subsequent treatment device through an overtaking pipeline.
The biological aerated filter adopts an air suspension fan for aeration, and performs frequency conversion control according to the DO condition of the effluent, thereby saving the power consumption.
The denitrification biological filter uses inert gas to expel DO, so that the denitrification effect is improved; and (3) carrying out denitrification reaction by adopting an external carbon source. The filter material for inhibiting the growth of bacteria is arranged at the lower layer, the added carbon source is not consumed due to the growth of aerobic bacteria, and the carbon source is saved by about one third. And (3) adopting an upper water outlet mode, wherein the wastewater passes through a denitrification layer, an external carbon source is taken as an electron donor to perform denitrification reaction, and nitrate is converted into nitrogen to be discharged. Meanwhile, due to the entry of inert gas, the filter material expands, aged sludge generated by organisms flows out along with water flow, the blocking probability of the filter material is reduced, and the backwashing period is prolonged. If the effluent of the system enters the double-membrane desalination system, the denitrification biological filter tank process can be eliminated or the overtaking setting can be carried out through an overtaking pipeline.
The high-efficiency dissolved air flotation tank is used for removing biological sludge which is generated in the denitrification process and is difficult to settle, and reducing the subsequent filtering pressure; remove the oil in the waste water, protect the follow-up two membrane method desalination systems, prevent that oil from making the dirt of membrane and blocking. Because the biological sludge contains air bubbles and is difficult to precipitate, the incoming water firstly enters the tubular reactor, the flocculating agent is added into the tubular reactor to form separable flocs, and the separable flocs are coalesced and compacted after being mixed with partial dissolved air water. Sediment precipitated in the water inlet area and sludge precipitated at the bottom of the separation area are scraped to a sludge discharge end by a sludge scraper and are discharged into a sludge system regularly and quantitatively through an automatic sludge discharge valve, so that the normal operation of the equipment is not influenced.
The air floating device adopts air as an air source, and is mixed with the water pressurized by the circulating pump in the dissolved air tank to form dissolved air water which is released to the water inlet chamber through the releaser. Can simultaneously remove oil and suspended matters in the wastewater, protect the quality of the subsequent desalting influent water by a double-membrane method and prolong the backwashing period of the filter tank.
The ozone catalytic oxidation pond plays a role in reducing COD (chemical oxygen demand) and chromaticity of effluent. Part of COD in the wastewater is degraded in a high-density sedimentation tank and a biological aerated filter, and the rest part of COD is removed in an ozone catalytic oxidation tank; in order to achieve higher removal effect of denitrification and prevent excessive or incomplete utilization of added carbon source by organisms, the ozone catalytic oxidation tank can play a role in ensuring that COD and BOD of effluent do not exceed the standard.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A system for reducing the concentration of pollutants in steel and iron comprehensive wastewater is characterized by comprising a regulating tank, a high-density sedimentation tank, a biological aerated filter, a denitrification biological filter, a high-efficiency dissolved air floatation tank, a filter and an ozone catalytic oxidation tank which are sequentially connected through a wastewater pipeline; wherein:
a liftable aerator is arranged in the regulating tank;
the high-density sedimentation tank is provided with a drug feeding device and a sediment discharge port which is connected with a sludge treatment system through a pipeline;
a fixed aerator is arranged in the biological aerated filter and is connected with an air suspension fan through a pipeline;
the denitrification biological filter is provided with an inert gas inlet and a carbon source adding device; the bottom of the denitrification biological filter is provided with a water inlet, the upper part of the denitrification biological filter is provided with a water outlet, and the filter body is internally provided with at least 2 filter layers which comprise an aerobic bacteria inhibition layer arranged on the lower layer and a denitrification layer arranged on the upper layer;
a pipe reactor is arranged on a wastewater pipeline at the upstream of the high-efficiency dissolved air floatation tank, and the pipe reactor is provided with a phosphorus removing agent adding port and a flocculating agent adding port; the high-efficiency dissolved air flotation tank is sequentially divided into a water inlet area, a water distribution area and a separation area along the water flow direction, the water inlet of the water inlet area is connected with the water outlet of the tubular reactor, and the water inlet area is provided with an air flotation device; the top of the water distribution area is provided with a slag scraper, the lower part of the water distribution area is provided with a corrugated inclined plate, and the bottom of the water distribution area is provided with a sludge discharge port; the bottom of the separation area is provided with a mud scraper and an automatic mud valve; the residue scraper is connected with the sludge treatment system through a residue discharge groove, the sludge scraper is connected with the sludge treatment system through a sludge discharge pipeline, and an automatic sludge discharge valve is arranged on the sludge discharge pipeline.
2. The system for reducing the pollutant concentration in the integrated steel and iron wastewater according to claim 1, characterized in that a heating device is further arranged in the regulating tank, and the heating device is an electric heating device or a steam heating device.
3. The system for reducing the concentration of pollutants in comprehensive wastewater of iron and steel according to claim 1, wherein the drug adding device in the high-density sedimentation tank is one or more of a lime adding device, a calcium chloride adding device, a sodium carbonate adding device, a sodium bicarbonate adding device, a PAC adding device and a PAM adding device.
4. The system for reducing the concentration of pollutants in integrated steel and iron wastewater according to claim 1, wherein the air suspension fan is controlled by frequency conversion.
5. The system for reducing the concentration of pollutants in wastewater from iron and steel synthesis as claimed in claim 1, wherein the air flotation device comprises a dissolved air tank, a circulating pump and a releaser, the dissolved air tank is provided with an air inlet, a circulating water inlet and a dissolved air water outlet, the circulating water inlet is connected with the circulating water outlet on the water inlet area through a circulating water pipeline, the circulating water pipeline is provided with a circulating pump, and the dissolved air water outlet is connected with the releaser in the water inlet area.
6. The system for reducing the pollutant concentration in integrated steel and iron wastewater according to claim 1, characterized in that the filter is a sand filter or a V-shaped filter.
7. The system for reducing the concentration of pollutants in wastewater from integrated steel and iron production according to claim 1, wherein a back-washing water outlet is arranged on a wastewater pipeline at the downstream of the filter tank, and the back-washing water outlet is respectively connected with the biological aerated filter, the biological denitrification filter and a back-washing water inlet of the filter tank through back-washing water pipelines; the aeration biological filter, the denitrification biological filter and the filter are respectively provided with a backwashing water outlet and are connected with the regulating tank through a backwashing water drainage pipeline.
8. A process for reducing the concentration of pollutants in integrated steel and iron wastewater based on the system of claim 1, comprising the steps of:
1) the method comprises the following steps that (1) steel comprehensive wastewater firstly enters an adjusting tank, and the adjusting tank is used for adjusting water quantity, balancing water quality and preventing sludge from precipitating; the waste water is oxygenated by aeration, and the ferrous iron in the waste water is oxidized into ferric iron so as to remove the total iron by adding lime into a subsequent high-density sedimentation tank to form ferric hydroxide sediment, thereby meeting the requirements of desalting and recycling the waste water; heating the wastewater in the adjusting tank according to the requirement, and avoiding the influence on the subsequent biochemical treatment effect and the double-membrane desalination water yield due to the over-low water temperature;
2) the effluent of the regulating tank enters a high-density sedimentation tank; in the high-density sedimentation tank, medicaments are added according to the water quality condition of the wastewater, and the method comprises the steps of adding lime to remove hardness so as to meet the requirements of desalting and recycling the wastewater; lime and calcium chloride are added to remove fluoride, so that the standard reaching requirement of the fluoride in the effluent is met; adding sodium carbonate or sodium bicarbonate to supplement alkalinity so as to meet the alkalinity required by ammoniation reaction and the alkalinity requirement in the subsequent ammonia nitrogen removal; PAC and PAM are added to form floc so as to remove SS; sludge generated by the high-density sedimentation tank enters a sludge treatment system for treatment;
3) the effluent of the high-density sedimentation tank enters an aeration biological filter; removing COD in the wastewater in the biological aerated filter, and converting ammonia nitrogen into nitrate;
4) the effluent of the aeration biological filter enters a denitrification biological filter; the denitrification biological filter adopts an upward water outlet mode, wastewater firstly passes through the aerobic bacteria inhibition layer to reduce DO, and then passes through the denitrification layer; when the wastewater passes through the denitrification layer, an external carbon source is taken as an electron donor to perform denitrification reaction, so that nitrate is converted into nitrogen to be discharged; adding inert gas to expand the filter material, and allowing aged sludge generated by organisms to flow out along water flow;
5) the effluent of the denitrification biological filter enters a high-efficiency dissolved air flotation tank; the wastewater firstly enters a tubular reactor, and a phosphorus removing agent and a flocculating agent are added into the tubular reactor to enable impurities in the wastewater to form separable flocculates; after the wastewater enters the water inlet area, the flocculate is contacted with bubbles with the diameter of 30-50 um released in the dissolved air to form a low-density 'air floating body', oil and suspended matters in the wastewater are removed at the same time, the flocculate is coalesced into scum in the water distribution area, and the scum is scraped to a scum collecting tank through a scum scraper and then automatically flows and is discharged into a sludge treatment system; the flocs with lower ascending speed and water flow downwards to be further coalesced through the corrugated inclined plate, the flocs with low density float to the water surface, the flocs with high density precipitate to the bottom, and sand deposited in the water distribution area is discharged through a sand discharge port; the silt precipitated in the water inlet area and the sludge precipitated at the bottom of the separation area are scraped to a sludge discharge end by a sludge scraper and are periodically and quantitatively discharged into a sludge treatment system through an automatic sludge discharge valve;
6) the water discharged from the high-efficiency dissolved air floatation tank enters a filter tank to remove suspended matters and reduce turbidity;
7) the effluent of the filter tank enters an ozone catalytic oxidation tank, part of COD in the wastewater is degraded in a high-density sedimentation tank and an aeration biofiltration tank, and the rest part of the COD is removed in the ozone catalytic oxidation tank; the COD and BOD in the wastewater can be ensured to reach the standard through the ozone catalytic oxidation tank, and the COD of the effluent of the system is less than or equal to 30 mg/L.
9. The process for reducing the pollutant concentration in the integrated wastewater of iron and steel according to claim 8, wherein as a pretreatment process of the double-membrane desalination process, the effluent of the system enters a double-membrane desalination system, and the step 5) is omitted or the effluent of the denitrification biofilter is directly sent to a subsequent treatment device through an overtaking pipeline.
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