CN106315909B - Device and method for removing COD (chemical oxygen demand) and two heavy metals including iron and nickel in cold-rolling dilute alkali wastewater - Google Patents
Device and method for removing COD (chemical oxygen demand) and two heavy metals including iron and nickel in cold-rolling dilute alkali wastewater Download PDFInfo
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Abstract
The invention discloses a system device for removing COD (chemical oxygen demand) and two heavy metals of iron and nickel in cold rolling dilute alkali wastewater, wherein a pH adjusting tank is connected with a reactor through a water lifting pump, the reactor is a closed cylinder, the bottom of the reactor is provided with a water inlet, and the top of the reactor is provided with a water outlet; a perforated plate is arranged above the water inlet, a modified bentonite packing layer, an activated carbon packing layer, a granulating slag layer and a clarification zone are sequentially arranged above the perforated plate from bottom to top, and a packing baffle is arranged between the granulating slag layer and the clarification zone; a backwashing water inlet is arranged above the clarification zone, and a backwashing outlet is arranged near the modified bentonite packing layer; the height-diameter ratio of the cylinder is 5: 1-30: 1. the invention also discloses a method for removing COD and two heavy metals of iron and nickel by using the device. The process has low one-time investment; the waste liquid treatment effect is stable; the production and operation cost is low; high automation degree and simple operation. The invention fully embodies the effects of energy conservation and emission reduction, and is an environment-friendly green steel production process.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a device and a method for efficiently removing COD (chemical oxygen demand) and two heavy metals of iron and nickel in cold rolling dilute alkali wastewater.
Background
As a basic industry of China, the steel industry is rapidly developed since the innovation is opened, and is always in a high-speed development stage in recent years, and the annual steel yield is increased by 15-22%. However, the steel industry is a high-energy-consumption, high-resource and high-pollution industry, and the water resource consumption of the steel industry is huge and accounts for about 14 percent of the water consumption of the national industry.
At present, the national emission standard of wastewater and related 'energy conservation and emission reduction' policies are gradually improved, and a new 'steel industry water pollutant emission standard' (GB13456-2012) is issued from 10.1.2012 and requires that the standard pH executed by the existing enterprises is 6-9, the COD is 30mg/L, the suspended matters are 20mg/L, the total iron is 2.0mg/L, and the total nickel is 0.05mg/L from 1.1.2015. The original index requirement is not so high, for example, COD can reach the standard only by 60mg/L, so the original device and method can not meet the requirement of a new index, and needs to be improved again.
The conventional method for removing COD, iron and nickel heavy metals from cold rolling dilute alkali wastewater is high in cost, and the COD, the iron and the nickel heavy metals cannot be removed simultaneously.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of developing an economic and efficient device for removing two heavy metals of COD, iron and nickel according to the water quality and water quantity condition of the cold rolling dilute alkali wastewater. Meanwhile, a treatment method for efficiently removing pollutants from cold rolling dilute alkali wastewater is developed, a green process and energy conservation and emission reduction are taken as main tasks, the environmental pollution is reduced, and increasingly strict environmental protection regulations are actively coped with.
The technical scheme of the invention is that the system device for removing COD (chemical oxygen demand) and two heavy metals of iron and nickel in cold rolling dilute alkali wastewater comprises a water inlet pump and a pH adjusting tank connected with the water inlet pump, wherein the pH adjusting tank is connected with a reactor through a water lifting pump, the reactor is a closed cylinder, the bottom of the reactor is provided with a water inlet, and the top of the reactor is provided with a water outlet; a perforated plate is arranged above the water inlet, a modified bentonite packing layer, an activated carbon packing layer, a granulating slag layer and a clarification zone are sequentially arranged above the perforated plate from bottom to top, and a partition plate is arranged between the granulating slag layer and the clarification zone; a backwashing water inlet is arranged above the clarification area, and a backwashing outlet is arranged near the modified bentonite packing layer;
the height-diameter ratio of the cylinder is 5: 1-30: 1.
the height-diameter ratio is used for prolonging the retention time of the wastewater in the reactor and is better contacted with the filler.
According to the system device of the invention, the length-width ratio of the pH adjusting tank is preferably 1.2-1.6.
According to the system device of the present invention, it is preferable that the perforated plate has a pore size of 100 to 800 μm.
The invention also provides a method for removing COD (chemical oxygen demand) and two heavy metals of iron and nickel in the cold-rolling dilute alkali wastewater by using the device, which comprises a water inlet pump and a pH regulating pool connected with the water inlet pump, and the method comprises the following steps:
a. cold rolling dilute alkali wastewater flows into a pH adjusting tank through a water inlet pump, the pH is adjusted to be 7.0-8.0, the residence time is 5-20 min, and the average flow speed is 1-10 m/s; the water quality COD of the cold rolling dilute alkali wastewater is 40-100 mg/L, the total iron is 2-10 mg/L, and the total nickel is 0.2-2 mg/L.
b. Cold-rolling dilute alkali wastewater enters the reactor through a lift pump, enters from a water inlet, passes through the perforated plate, sequentially passes through the modified bentonite packing layer, the activated carbon packing layer, the grain slag layer and the clarification zone, and finally flows out of a water outlet, wherein the retention time of the cold-rolling dilute alkali wastewater in the reactor is 12-45 min; and performing backwashing;
the preparation of the modified bentonite comprises the following steps:
1) screening: screening and grading by using a crusher, and screening bentonite with the particle size of 30-120 meshes;
2) and (3) low-temperature drying: drying the mixture for 2 to 4 hours in a drying oven with the particle size of 30 to 120 meshes at the temperature of 100-;
3) soaking and stirring with a sodium treatment agent: soaking the dried bentonite in a sodium treatment agent solution with the concentration of 2-25%, and then stirring for 5-16 hours at a constant temperature, wherein the stirring speed is 500-1200 r/min, and the temperature is kept between 82-95 ℃;
4) standing and drying: standing for 15-29 hours at constant temperature after stirring is finished, then pouring out the upper-layer aqueous solution, and drying the turbid solution with the bentonite on the lower layer in a drying oven at the temperature of 100-;
5) aluminum salt soaking and stirring: and soaking the dried bentonite in an aluminum salt solution with the concentration of 1-19%. Then stirring for 2-11 hours by using a constant-temperature stirrer, wherein the stirring speed is 500-1200 r/min, the temperature is kept between 67-85 ℃, and standing for 12-24 hours after stirring is finished;
6) drying and natural cooling: and after standing, pouring the suspension, drying the lower-layer turbid liquid in a drying oven at the temperature of 100-110 ℃ for 3-6 hours, and naturally cooling to obtain the modified bentonite.
The pH value of the cold rolling dilute alkali wastewater entering the pH adjusting tank is 6-9, the length-width ratio of the adjusting tank is 1.2-1.6, the residence time is 5-20 min, and the average flow speed is 1-10 m/s. Adding industrial waste sulfuric acid or waste calcium hydroxide into the pH adjusting tank to adjust the cold rolling dilute alkali wastewater. A pH meter and an automatic control system are arranged in the adjusting tank, the pH value is controlled to be 7.0-8.0 in the effluent, and the adding amount of waste acid is adjusted by controlling the pH automatic control system. More preferably, the present invention has a conditioning tank aspect ratio of 1.4, a residence time of 12min and an average flow velocity of 7 m/s.
The reactor has the main function of removing organic pollutants such as COD (chemical oxygen demand) and inorganic pollutants such as heavy metals in the cold rolling dilute alkali wastewater. The packing reactor is a closed cylinder. The height-diameter ratio of the cylinder is 5: 1-30: 1, the retention time of the cold rolling dilute alkali wastewater in the reactor is 12-45 min.
According to the method of the present invention, preferably, the back-flushing period of the reactor is 96 hours to 240 hours; and (3) feeding back-flushed clean water from a flushing water port, wherein the flushing time is 5-10 min, and discharging the flushed water from a flushing outlet. And performing non-simultaneous backwashing and cold rolling dilute alkali wastewater entering from the water inlet, stopping the equipment during backwashing, and operating the equipment after backwashing.
The packing layer of the reactor is a modified bentonite packing layer, an active carbon packing layer and a water slag layer from bottom to top. Preferably, the volume ratio of the modified bentonite filler layer to the activated carbon filler layer to the water slag layer is 50-90%: 10-35%: 5 to 15 percent. Preferably, the volume ratio of the bentonite filler layer to the activated carbon filler layer is 80 percent, and the volume ratio of the activated carbon filler layer to the grain slag layer is 5 percent. The modified bentonite filler area has the main function of removing heavy metals and COD in the cold rolling dilute alkali wastewater. The active carbon filler layer has the function of further removing heavy metal and COD in the cold rolling dilute alkali wastewater, and the water slag layer has the function of removing suspended matters and preventing the loss of the filler.
The interlayer spacing of the modified bentonite is large, the interlayer is changed from hydrophilicity to hydrophobicity, and the capability of adsorbing organic matters in water is improved by dozens to hundreds of times compared with that of the common bentonite. The modified bentonite has the advantages of adjustable structural function, capability of efficiently removing organic matters and heavy metals, repeated use, large saturated adsorption capacity and the like. After the modified bentonite is modified, the water absorption and exchange capacity of the bentonite are increased, and the specific surface area of the bentonite is also increased, so that COD (chemical oxygen demand) and iron and nickel metals can be adsorbed simultaneously.
Furthermore, the water absorption of the modified bentonite is 100-300%, the colloid content is 2-15 ml/g, the cation exchange capacity is 0.9-1.5 mmol/g, and the wet compressive strength is 10-35 kPa.
Wherein, the sodium reagent in the step (3) is one or more of sodium chloride, sodium carbonate, sodium hydroxide or sodium acetate; and (5) the aluminum salt is one or more of aluminum sulfate, aluminum trichloride or aluminum potassium sulfate.
Preferably, the particle size of the active carbon filler layer is 50-120 meshes, and the specific surface area is 2400-3600 m2The surface density is 370-580 g/l. More preferably, the activated carbon has a particle size of 80 mesh and a specific surface area of 3200m2The surface density was 470 g/l.
Preferably, the granulated slag in the granulated slag layer is molten slag from a blast furnace during blast furnace iron making, and granular solid residues are generated after water quenching, wherein the chemical composition of the granulated slag mainly comprises CaO: 35-49%; SiO 22：14～39％；Al2O3: 3-17%; MgO: 5 to 13 percent. The grain size of the grain slag is 50-120 meshes, and the uniformity is 87-99%. Preferably, the chemical components of the granulated slag are CaO: 41 percent; SiO 22：35％；Al2O3: 12 percent; MgO: 12%, the particle size is 80 mesh, and the uniformity is 97%.
The invention has the beneficial effects that:
the invention aims to develop a method and a device for economically and efficiently removing COD (chemical oxygen demand) and two heavy metals of iron and nickel according to the water quality and water quantity condition of cold rolling dilute alkali wastewater. The development of the device for efficiently removing the pollutants from the cold rolling dilute alkali wastewater takes green process and energy conservation and emission reduction as main tasks, reduces environmental pollution, and actively deals with increasingly strict environmental protection regulations.
After the whole process treatment, the water quality pH of the cold rolling dilute alkali wastewater is 6-9, the COD is 10-30 mg/L, the total iron is 0.5-2.0 mg/L, and the total nickel is 0.01-0.05 mg/L, which completely reaches the national emission standard.
The invention provides a novel technical scheme for removing COD (chemical oxygen demand) and heavy metals such as iron and nickel from cold rolling dilute alkali wastewater, and solves the problem of environmental pollution caused by discharge of the cold rolling dilute alkali wastewater. Therefore, the invention belongs to an environment-friendly production process of steel. The invention effectively solves the problem of removing COD, iron and nickel heavy metals from cold rolling dilute alkali wastewater by using a low-cost green water treatment technology. Therefore, the invention has the double effects of economy and environmental protection and has good social benefit and environmental benefit.
Drawings
FIG. 1 is a structural diagram of a reactor for removing COD and two heavy metals of iron and nickel.
In the figure, 1-water inlet, 2-perforated plate, 3-modified bentonite packing layer, 4-backwashing water inlet, 5-activated carbon packing layer, 6-water slag layer, 7-packing baffle, 8-clarification zone, 9-backwashing water outlet and 10-water outlet.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention relates to a reactor (figure 1) for removing COD (chemical oxygen demand), iron and nickel, which comprises a water inlet 1, a perforated plate 2, a modified bentonite packing layer 3, a backwashing water inlet 4, an activated carbon packing layer 5, a water slag layer 6, a packing partition plate 7, a clarification zone 8, a backwashing water outlet 9 and a water outlet 10.
The reactor is a closed cylinder, the bottom of the reactor is provided with a water inlet 1, and the top of the reactor is provided with a water outlet 10; a perforated plate 2 is arranged above the water inlet, a modified bentonite packing layer 3, an activated carbon packing layer 5, a granulating slag layer 6 and a clarification zone 7 are sequentially arranged above the perforated plate 2 from bottom to top, and a packing baffle 7 is arranged between the granulating slag layer 6 and the clarification zone 8; a backwashing water inlet 9 is arranged above the clarification zone 8, and a backwashing outlet 4 is arranged near the modified bentonite packing layer; the height-diameter ratio of the cylinder is 5: 1-30: 1.
example 1:
the pH value of the cold rolling dilute alkali wastewater is 8.7, the COD is 87mg/L, the suspended matters are 45mg/L, the total iron is 5mg/L, and the total nickel is 1.6 mg/L.
And the cold rolling dilute alkali wastewater flows into a pH adjusting tank through a water inlet pump.
The pH of the cold rolling dilute alkali wastewater entering the pH adjusting tank is 8.7, the length-width ratio of the adjusting tank is 1.4, the retention time is 12min, and the average flow velocity is 7 m/s. Adding industrial waste sulfuric acid or waste calcium hydroxide into the pH adjusting tank to adjust the cold rolling dilute alkali wastewater. The adjusting tank is provided with a pH meter and an automatic control system, and the pH value is controlled to be 7.9.
Then the cold rolling dilute alkali wastewater enters a reactor for efficiently removing COD (chemical oxygen demand) and two heavy metals of iron and nickel through a lift pump, and the reactor has the main function of removing organic pollutants such as COD and the like and inorganic pollutants such as various heavy metals and the like in the cold rolling dilute alkali wastewater. The packing reactor is a closed cylinder. The height-diameter ratio of the cylinder is 15: 1, the retention time of the cold rolling dilute alkali wastewater in the reactor is 26 min.
Cold rolling dilute alkali wastewater enters a filling area through a water inlet and a perforated plate with the aperture of 500 mu m. The filler area is divided into a modified bentonite filler layer, an active carbon filler layer and a grain slag layer, and the volume ratio of the modified bentonite filler layer to the active carbon filler layer is 80%, the volume ratio of the active carbon filler layer to the grain slag layer is 15%, and the volume ratio of the grain slag layer to the active carbon filler layer to the grain slag layer is 5%.
Preparing modified bentonite: 1) screening: sieving and grading by a crusher, and sieving bentonite with the particle size of 100 meshes. 2) And (3) low-temperature drying: drying in a drying oven with a particle size of 100 mesh at 105 deg.C for 4 hr. 3) Soaking and stirring with a sodium treatment agent: soaking the dried bentonite in 21% sodium salt solution. Then the mixture was stirred for 11 hours with a constant temperature stirrer at a stirring speed of 1000r/min and a temperature of 91 ℃. 4) Standing and drying: after stirring, the mixture was allowed to stand at a constant temperature for 25 hours, then the aqueous solution on the upper layer was poured out, and the suspension having bentonite on the lower layer was dried in a 105 ℃ drying oven for 4 hours. 5) Aluminum salt soaking and stirring: soaking the dried bentonite in 15% aluminum sulfate solution. Then the mixture was stirred for 7 hours with a constant temperature stirrer at a stirring speed of 800r/min and a temperature of 81 ℃ and allowed to stand for 16 hours after the stirring was completed. 6) Drying and natural cooling: and after standing, pouring the suspension, drying the lower-layer turbid liquid in a 105-DEG C drying oven for 4 hours, and naturally cooling to prepare the modified bentonite.
Further, the modified bentonite obtained by the preparation has the water absorption of 260 percent, the colloid content of 11ml/g, the cation exchange capacity of 1.4mmol/g and the wet compression strength of 30 kPa.
The particle size of the active carbon in the active carbon layer is 80 meshes, and the specific surface area is 3200m2The surface density was 470 g/l.
The water slag in the water slag layer is molten slag from a blast furnace during blast furnace iron making, and granular solid residues are generated after water quenching.
Further, the chemical components of the granulated slag are CaO: 41 percent; SiO 22：35％；Al2O3: 12 percent; MgO: 12%, the particle size is 80 mesh, and the uniformity is 97%.
And the cold rolling dilute alkali wastewater passes through the clarifying area of the filler reactor and the filler partition plate and is discharged from a water outlet.
The back flushing period of the whole reactor for efficiently removing COD and two heavy metals of iron and nickel is 192 hours. And the back-flushing clean water enters from the flushing water port, and the flushing time is 9 min.
Finally, the cold rolling dilute alkali wastewater is discharged through a water outlet pump
After the whole process treatment, the water quality pH of the cold rolling dilute alkali wastewater is 7.9, the COD is 13mg/L, the suspended matters are 7mg/L, the total iron is 0.6mg/L, and the total nickel is 0.02mg/L, which completely reaches the national discharge standard.
Example 2:
the pH value of the cold rolling dilute alkali wastewater is 6.5, the COD is 52mg/L, the suspended matters are 23mg/L, the total iron is 7mg/L, and the total nickel is 0.6 mg/L.
And the cold rolling dilute alkali wastewater flows into a pH adjusting tank through a water inlet pump.
The pH of the cold rolling dilute alkali wastewater entering the pH adjusting tank is 6.5, the length-width ratio of the adjusting tank is 1.4, the retention time is 12min, and the average flow velocity is 7 m/s. Waste calcium hydroxide is added into the pH adjusting tank to adjust the cold rolling dilute alkali wastewater. The adjusting tank is provided with a pH meter and an automatic control system, and the pH value is controlled to be 7.7.
Then the cold rolling dilute alkali wastewater enters a reactor for efficiently removing COD (chemical oxygen demand) and two heavy metals of iron and nickel through a lift pump, and the reactor has the main function of removing organic pollutants such as COD and the like and inorganic pollutants such as various heavy metals and the like in the cold rolling dilute alkali wastewater. The packing reactor is a closed cylinder. The height-diameter ratio of the cylinder is 20: 1, the retention time of the cold rolling dilute alkali wastewater in the reactor is 30 min.
Cold rolling dilute alkali wastewater enters a filling area through a water inlet and a perforated plate with the aperture of 300 mu m. The filler area is divided into a modified bentonite filler layer, an active carbon filler layer and a grain slag layer, and the volume ratio of the modified bentonite filler layer is 70%, the active carbon filler layer is 20% and the grain slag layer is 10%.
Preparing modified bentonite: 1) screening: sieving and grading by a crusher, and sieving bentonite with the particle size of 60 meshes. 2) And (3) low-temperature drying: drying in a drying oven with a particle size of 60 meshes at 105 ℃ for 2 hours. 3) Soaking and stirring with a sodium treatment agent: soaking the dried bentonite in 13% sodium hydroxide solution. Then the mixture is stirred for 6 hours by a constant temperature stirrer, the stirring speed is 700r/min, and the temperature is kept at 83 ℃. 4) Standing and drying: after stirring, the mixture was allowed to stand at a constant temperature for 16 hours, then the aqueous solution on the upper layer was poured out, and the suspension having bentonite on the lower layer was dried in a 105 ℃ drying oven for 3 hours. 5) Aluminum salt soaking and stirring: soaking the dried bentonite in 15% aluminum trichloride solution. Then stirring for 3 hours by a constant temperature stirrer, wherein the stirring speed is 700r/min, the temperature is kept at 73 ℃, and standing is carried out for 13 hours after the stirring is finished. 6) Drying and natural cooling: and after standing, pouring the suspension, drying the lower-layer turbid liquid in a 105-DEG C drying oven for 4 hours, and naturally cooling to prepare the modified bentonite.
Further, the modified bentonite obtained by the preparation has the water absorption of 230%, the colloid content of 5ml/g, the cation exchange capacity of 1.1mmol/g and the wet compressive strength of 15 kPa.
Of said activated carbon layer, of activated carbonThe particle diameter is 80 meshes, the specific surface area is 2600m2The surface density was 380 g/l.
The water slag in the water slag layer is molten slag from a blast furnace during blast furnace iron making, and granular solid residues are generated after water quenching.
Further, the chemical components of the granulated slag are CaO: 45 percent; SiO 22：31％；Al2O3: 15 percent; MgO: 9%, the particle size was 70 mesh, and the uniformity was 91%.
And the cold rolling dilute alkali wastewater passes through the clarifying area of the filler reactor and the filler partition plate and is discharged from a water outlet.
The backwashing period of the whole reactor for efficiently removing COD and two heavy metals of iron and nickel is 240 hours. And the back-flushing clean water enters from the flushing water port, and the flushing time is 7 min.
Finally, the cold rolling dilute alkali wastewater is discharged through a water outlet pump
After the whole process treatment, the water quality pH of the cold rolling dilute alkali wastewater is 7.2, the COD is 21mg/L, the suspended matters are 16mg/L, the total iron is 1.3mg/L, and the total nickel is 0.04mg/L, which completely reaches the national discharge standard.
In conclusion, the cold rolling dilute alkali wastewater treatment system realizes the standard discharge of the cold rolling dilute alkali wastewater, and the process has low one-time investment; the waste liquid treatment effect is stable; the production and operation cost is low; high automation degree and simple operation. The invention fully embodies the effects of energy conservation and emission reduction, and is an environment-friendly green steel production process.
Of course, those skilled in the art should recognize that the above-described embodiments are illustrative only, and not limiting, and that changes and modifications can be made within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for removing COD, iron and nickel heavy metals in cold rolling dilute alkali wastewater comprises a water inlet pump and a pH adjusting tank connected with the water inlet pump, and is characterized in that: the method comprises the following steps:
a. cold rolling dilute alkali wastewater flows into a pH adjusting tank through a water inlet pump, the pH is adjusted to be 7.0-8.0, the residence time is 5-20 min, and the average flow speed is 1-10 m/s; the water quality COD of the cold rolling dilute alkali wastewater is 40-100 mg/L, the total iron is 2-10 mg/L, and the total nickel is 0.2-2 mg/L;
b. cold-rolling dilute alkali wastewater enters the reactor through a lift pump, enters from a water inlet, passes through the perforated plate, sequentially passes through the modified bentonite packing layer, the activated carbon packing layer, the grain slag layer and the clarification zone, and finally flows out of a water outlet, wherein the retention time of the cold-rolling dilute alkali wastewater in the reactor is 12-45 min; and performing backwashing; the volume ratio of the modified bentonite packing layer to the activated carbon packing layer to the water slag layer is 50-90%: 10-35%: 5-15%;
the preparation of the modified bentonite comprises the following steps:
1) screening: screening and grading by using a crusher, and screening bentonite with the particle size of 30-120 meshes;
2) and (3) low-temperature drying: drying the mixture for 2 to 4 hours in a drying oven with the particle size of 30 to 120 meshes at the temperature of 100-;
3) soaking and stirring with a sodium treatment agent: soaking the dried bentonite in a sodium treatment agent solution with the concentration of 2-25%, and then stirring for 5-16 hours at a constant temperature, wherein the stirring speed is 500-1200 r/min, and the temperature is kept between 82-95 ℃;
4) standing and drying: standing for 15-29 hours at constant temperature after stirring is finished, then pouring out the upper-layer aqueous solution, and drying the turbid solution with the bentonite on the lower layer in a drying oven at the temperature of 100-;
5) aluminum salt soaking and stirring: soaking the dried bentonite in an aluminum salt solution with the concentration of 1-19%; then stirring for 2-11 hours by using a constant-temperature stirrer, wherein the stirring speed is 500-1200 r/min, the temperature is kept between 67-85 ℃, and standing for 12-24 hours after stirring is finished;
6) drying and natural cooling: after standing, pouring the suspension, drying the lower-layer turbid liquid in a drying oven at the temperature of 100-;
the water absorption rate of the modified bentonite is 100-300%, the colloid content is 2-15 ml/g, the cation exchange capacity is 0.9-1.5 mmol/g, and the wet compressive strength is 10-35 kPa.
2. The method for removing COD, iron and nickel heavy metals in cold rolling dilute alkali wastewater according to claim 1, characterized in that the back washing period of the reactor is 96-240 hours; and (3) feeding back-flushed clean water from a flushing water port, wherein the flushing time is 5-10 min, and discharging the flushed water from a flushing outlet.
3. The method for removing COD, iron and nickel heavy metals in cold rolling dilute alkali wastewater according to claim 1, characterized in that the sodium reagent in step (3) is one or more mixture of sodium chloride, sodium carbonate, sodium hydroxide or sodium acetate; and (5) the aluminum salt is one or more of aluminum sulfate, aluminum trichloride or aluminum potassium sulfate.
4. The method for removing COD, iron and nickel heavy metals in cold rolling dilute alkali wastewater according to claim 1, wherein the particle size of the activated carbon filler layer is 50-120 meshes, and the specific surface area is 2400-3600 m2The surface density is 370-580 g/L.
5. The method for removing heavy metals of COD and two of Fe and Ni from cold rolling dilute alkali wastewater according to claim 1, wherein the water granulated slag in the water granulated slag layer is molten slag from a blast furnace during blast furnace ironmaking, and granular solid residue is generated after water quenching, and the chemical composition of the water granulated slag is mainly CaO: 35-49%; SiO 22：14～39％；Al2O3: 3-17%; MgO: 5-13%, the grain size of the granulated slag is 50-120 meshes, and the uniformity is 87-99%.
6. A system device for removing COD and two heavy metals of iron and nickel in cold rolling dilute alkali wastewater by implementing the method of claim 1, which comprises a water inlet pump and a pH adjusting tank connected with the water inlet pump, and is characterized in that: the pH adjusting tank is connected with a reactor through a lifting pump, the reactor is a closed cylinder, the bottom of the reactor is provided with a water inlet, and the top of the reactor is provided with a water outlet; a perforated plate is arranged above the water inlet, a modified bentonite packing layer, an activated carbon packing layer, a granulating slag layer and a clarification zone are sequentially arranged above the perforated plate from bottom to top, and a packing baffle is arranged between the granulating slag layer and the clarification zone; a backwashing water inlet is arranged above the clarification area, and a backwashing outlet is arranged near the modified bentonite packing layer;
the height-diameter ratio of the cylinder is 5: 1-30: 1; the volume ratio of the modified bentonite packing layer to the activated carbon packing layer to the water slag layer is 50-90%: 10-35%: 5 to 15 percent.
7. The system device for removing COD, iron and nickel heavy metals in cold rolling dilute alkali wastewater according to claim 6, wherein the length-width ratio of the pH adjusting tank is 1.2-1.6.
8. The system device for removing COD, iron and nickel heavy metals in cold rolling dilute alkali wastewater according to claim 6, wherein the aperture of the perforated plate is 100-800 μm.
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| CN110950400B (en) * | 2018-09-27 | 2022-02-22 | 宝山钢铁股份有限公司 | Method for removing total nickel and dissolved organic matters in cold rolling nickel-containing wastewater |
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| CN101811792A (en) * | 2009-02-24 | 2010-08-25 | 宝山钢铁股份有限公司 | Processing method of stainless steel cold rolling pickling wastewater |
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| CN104176845A (en) * | 2013-05-20 | 2014-12-03 | 宝山钢铁股份有限公司 | Cold-rolling alkaline oil-containing wastewater reuse treatment method |
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| CN101811792A (en) * | 2009-02-24 | 2010-08-25 | 宝山钢铁股份有限公司 | Processing method of stainless steel cold rolling pickling wastewater |
| CN104176845A (en) * | 2013-05-20 | 2014-12-03 | 宝山钢铁股份有限公司 | Cold-rolling alkaline oil-containing wastewater reuse treatment method |
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