CN111686658A - Device for preparing sewage/wastewater coagulant, sewage/wastewater coagulant and preparation method thereof - Google Patents
Device for preparing sewage/wastewater coagulant, sewage/wastewater coagulant and preparation method thereof Download PDFInfo
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- CN111686658A CN111686658A CN202010387611.1A CN202010387611A CN111686658A CN 111686658 A CN111686658 A CN 111686658A CN 202010387611 A CN202010387611 A CN 202010387611A CN 111686658 A CN111686658 A CN 111686658A
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- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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Abstract
The invention relates to the technical innovation field of sewage/wastewater coagulants, in particular to a device for preparing a sewage/wastewater coagulant, a sewage/wastewater coagulant and a preparation method thereof. The device provided by the invention realizes high-speed and high-pressure collision type instant reaction of copper smelting waste slag slurry containing ferrosilicon micro powder and concentrated sulfuric acid in a vortex spray mode by arranging the atomization mixing reactor 12 and the tower reactor 8, so that a solid coagulant containing 7-9 crystal water is obtained, and the prepared coagulant has the advantages of better reducing COD (chemical oxygen demand) in sewage and wastewaterMn、CODCr、BOD5And Kjeldahl nitrogen nonionic ammonia and other harmful pollutants. And no waste gas, waste water and waste residue exist in the whole continuous production process. Simultaneously avoids the condition that the ferrosilicon micro powder can only be shaped under the common conditionThe paste-like material may cause denaturation after drying treatment.
Description
Technical Field
The invention relates to the technical field of sewage/wastewater coagulants, in particular to a device for preparing a sewage/wastewater coagulant, a sewage/wastewater coagulant and a preparation method thereof.
Background
At present, the method has important significance for the treatment of sewage/wastewater to human survival, and the main reasons include the following aspects: the sewage/wastewater contains a large amount of organic matters, and microorganisms decompose and consume a large amount of oxygen to easily cause death of organisms in the water, so that ecological imbalance can be caused; heavy metals contained in the sewage/wastewater may enter human dining tables through food chains, and harm human health; the sewage/waste water can generate odor which pollutes the atmosphere and is harmful to the environment.
Meanwhile, the copper smelting waste slag is a main waste in the production process of refined copper, and the chemical components and the metallographic structure of the copper smelting waste slag mainly comprise an iron-silicon combination, a trace iron-silicon-calcium combination and a small amount of trivalent free iron. Therefore, how to produce coagulant for effectively treating sewage without pollution while effectively treating copper smelting waste slag is a problem which is not solved and researched at home and abroad.
Disclosure of Invention
The invention aims to provide a device for preparing a sewage/wastewater coagulant, the sewage/wastewater coagulant and a preparation method thereof, wherein the device for preparing the sewage/wastewater coagulant can realize clash instant reaction of a byproduct concentrated sulfuric acid and copper smelting waste slag slurry, and can produce the sewage/wastewater coagulant at one time, and the sewage/wastewater coagulant has a good effect on sewage/wastewater treatment.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a device for preparing a sewage/wastewater coagulant, which comprises a copper smelting waste residue conveying device 27, a scraper conveyor 1, a spiral feeder 24, a stirring tank 25, an atomization mixing reactor 12, a tower reactor 8, a coil cooler 19 and a sulfuric acid storage tank 7;
the copper smelting waste residue conveying device 27, the scraper conveyor 1, the spiral feeder 24, the stirring tank 25, the atomization mixing reactor 12, the tower reactor 8 and the coil cooler 19 are sequentially connected;
the sulfuric acid storage tank 7, the atomization mixing reactor 12, the tower reactor 8 and the coil cooler 19 are connected in sequence.
Preferably, a discharge hole of the stirring tank 25 is provided with a weighing sensor 26;
a slurry intermediate tank 10, a cam metering pump 4, a first pressure-stabilizing pipe 2 and a second electromagnetic flowmeter 20 are sequentially connected between the stirring tank 25 and the atomization mixing reactor 12;
a sulfuric acid metering pump 3, a second pressure stabilizing pipe 6 and a first electromagnetic flow meter 5 are sequentially connected between the sulfuric acid storage tank 7 and the atomization mixing reactor 12;
the atomization mixing reactor 12 is connected with an electric heater 9 and a blower 11 in sequence;
the electric heater 9 is respectively connected in parallel with the sulfuric acid storage tank 7 and the slurry intermediate tank 10.
Preferably, a high-efficiency cyclone separator 13 and a rotary discharge valve 18 are sequentially connected between the tower reactor 8 and the coil cooler 19; the tower reactor 8 is connected with the high-efficiency cyclone separator 13; the coil cooler 19 is connected with the rotary discharge valve 18;
the coil cooler 19 is connected with a cam deceleration discharging motor 21, a circulating water tank 22 and a circulating water pump 23.
Preferably, the high-efficiency cyclone separator 13 is sequentially connected with an induced draft fan 15, a tail gas scrubber 14 and a circulating pump 16;
the induced draft fan 15 is connected with the rotary discharge valve 18 in parallel.
Preferably, an electric instrument control system 17 is further included;
the electrical instrument control system 17 is electrically connected with the copper smelting waste residue conveying device 27, the scraper conveyor 1, the spiral feeder 24, the stirring tank 25, the atomization mixing reactor 12, the tower reactor 8, the coil cooler 19, the sulfuric acid storage tank 7, the weighing sensor 26, the slurry intermediate tank 10, the cam metering pump 4, the first pressure stabilizing pipe 2, the second electromagnetic flow meter 20, the sulfuric acid metering pump 3, the second pressure stabilizing pipe 6, the first electromagnetic flow meter 5, the electric heater 9, the air blower 11, the efficient cyclone separator 13, the rotary discharge valve 18, the cam deceleration discharge motor 21, the circulating water tank 22, the circulating water pump 23, the induced draft fan 15, the tail gas washer 14 and the circulating pump 16 respectively.
The invention also provides a preparation method of the sewage/wastewater coagulant, which comprises the following steps:
the preparation method is carried out in the device in the technical scheme;
adding the copper smelting waste residues in the copper smelting waste residue conveying device 27 into a stirring tank 25 sequentially through a scraper conveyor 1 and a spiral feeder 24, and then sequentially adding water and a composite catalyst into the stirring tank 25 to obtain slurry;
and simultaneously conveying the slurry and concentrated sulfuric acid in a sulfuric acid storage tank 7 to the atomization mixing reactor 12, combining in the tower reactor 8 in a spraying manner, carrying out catalytic reaction, and cooling by a coil cooler 19 to obtain the sewage/wastewater coagulant.
Preferably, the composite catalyst comprises ionic rare earth oxide and iron powder atomized spherical alloy powder;
the mass ratio of the ionic rare earth oxide to the iron powder atomized spherical alloy powder is (5.5-6.5): (3.5-4.5);
the solid content of the slurry is 60-75%;
the mass ratio of the copper smelting waste residues to the composite catalyst is (25-43): (0.6-2.5).
Preferably, the ratio of the delivery flow rates of the slurry and the concentrated sulfuric acid is (0.25-0.5): (0.5-0.75).
Preferably, the slurry and the concentrated sulfuric acid are conveyed at high pressure;
the conveying pressure of the concentrated sulfuric acid is 7-9 MPa;
the conveying pressure of the slurry is 0.5-3 MPa.
The invention also provides a sewage/wastewater coagulant prepared by the preparation method of the technical scheme, wherein the sewage coagulant comprises [ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2And O, wherein n is 1-3, and m is 7-9.
The invention provides a device for preparing a sewage coagulant, which comprises a copper smelting waste residue conveying device 27, a scraper conveyor 1, a spiral feeder 24, a stirring tank 25, an atomization mixing reactor 12, a tower reactor 8 and a coil pipe coolerA cooler 19 and a sulfuric acid storage tank 7; the copper smelting waste residue conveying device 27, the scraper conveyor 1, the spiral feeder 24, the stirring tank 25, the atomization mixing reactor 12, the tower reactor 8 and the coil cooler 19 are sequentially connected; the sulfuric acid storage tank 7, the atomization mixing reactor 12, the tower reactor 8 and the coil cooler 19 are connected in sequence. According to the invention, the atomization mixing reactor 12 and the tower reactor 8 are arranged to enable the copper smelting waste residue containing the ferrosilicon micro powder and the concentrated sulfuric acid to realize high-speed high-pressure collision type instant reaction in a spray mode, so that the solid sewage/wastewater coagulant containing 7-9 crystal water is obtained, and the prepared sewage/wastewater coagulant has the advantage of better reducing COD (chemical oxygen demand) in the sewage/wastewaterMn、CODcr、BOD5And Kjeldahl nitrogen nonionic ammonia and other harmful pollutants. And the whole continuous production process has no waste gas, waste water and waste residue, and simultaneously, the problem that the ferrosilicon micro powder can only form pasty substances under the common condition and can cause denaturation after being dried is avoided.
The invention also provides a preparation method of the sewage coagulant, which comprises the following steps: the preparation method is carried out in the device in the technical scheme; adding the copper smelting waste residues in the copper smelting waste residue conveying device 27 into a stirring tank 25 sequentially through a scraper conveyor 1 and a spiral feeder 24, and then sequentially adding water and a composite catalyst into the stirring tank 25 to obtain slurry; and simultaneously conveying the slurry and concentrated sulfuric acid in a sulfuric acid storage tank 7 to the atomization mixing reactor 12, combining in the tower reactor 8 in a spraying manner, carrying out catalytic reaction, and cooling by a coil cooler 19 to obtain the sewage coagulant. The invention utilizes the reaction of the iron-silicon composition of the copper smelting waste residue and concentrated sulfuric acid: SiFe-FeSiO2+H2SO4→[Fe2(SiO3)3(SO4)3·nH2O]m+Fe2(SiO3)3(SO4)3·nH2O+FeSO4·nH2And O, preparing the sewage coagulant which has a good sewage treatment effect.
Drawings
FIG. 1 is an apparatus for preparing a sewage coagulant according to the present invention;
wherein, 1-scraper conveyer, 2-first pressure-stabilizing pipe, 3-sulfuric acid metering pump, 4-cam metering pump, 5-first electromagnetic flowmeter, 6-second pressure-stabilizing pipe, 7-sulfuric acid storage tank, 8-tower reactor, 9-electric heater, 10-slurry intermediate tank, 11-blower, 12-atomization mixing reactor, 13-high efficiency cyclone separator, 14-tail gas scrubber, 15-draught fan, 16-circulating pump, 17-electric apparatus control system, 18-rotary discharge valve, 19-coil cooler, 20-second electromagnetic flowmeter, 21-cam deceleration discharge motor, 22-circulating water tank, 23-circulating water pump, 24-spiral feeder, 25-stirring tank, 26-weighing sensor, 27-copper smelting waste residue conveying device.
Detailed Description
The invention provides a device for preparing a sewage coagulant, which comprises a copper smelting waste residue conveying device 27, a scraper conveyor 1, a spiral feeder 24, a stirring tank 25, an atomization mixing reactor 12, a tower reactor 8, a coil cooler 19 and a sulfuric acid storage tank 7;
the copper smelting waste residue conveying device 27, the scraper conveyor 1, the spiral feeder 24, the stirring tank 25, the atomization mixing reactor 12, the tower reactor 8 and the coil cooler 19 are sequentially connected;
the sulfuric acid storage tank 7, the atomization mixing reactor 12, the tower reactor 8 and the coil cooler 19 are connected in sequence.
In a specific embodiment of the present invention, the spray head of the atomizing mixing reactor 12 comprises a first spiral nozzle and a second spiral nozzle; the first spiral nozzle and the second spiral nozzle respectively spray concentrated sulfuric acid and slurry containing copper smelting waste residues.
In a specific embodiment of the invention, the height of the column reactor 8 is 8 meters.
In the specific embodiment of the present invention, a weighing sensor 26 is disposed at the discharge port of the stirring tank 25; the stirring tank 25 comprises two stirring tanks, so that the continuous operation and the non-stop operation can be ensured in the feeding process;
a slurry intermediate tank 10, a cam metering pump 4, a first pressure-stabilizing pipe 2 and a second electromagnetic flowmeter 20 are sequentially connected between the stirring tank 25 and the atomization mixing reactor 12;
a sulfuric acid metering pump 3, a second pressure stabilizing pipe 6 and a first electromagnetic flow meter 5 are sequentially connected between the sulfuric acid storage tank 7 and the atomization mixing reactor 12;
the atomization mixing reactor 12 is connected with an electric heater 9 and a blower 11 in sequence;
the electric heater 9 is respectively connected in parallel with the sulfuric acid storage tank 7 and the slurry intermediate tank 10.
In the specific embodiment of the invention, a high-efficiency cyclone separator 13 and a rotary discharge valve 18 are connected between the tower reactor 8 and the coil cooler 19 in sequence; the tower reactor 8 is connected with the high-efficiency cyclone separator 13; the coil cooler 19 is connected with the rotary discharge valve 18;
the coil cooler 19 is connected with a cam deceleration discharging motor 21, a circulating water tank 22 and a circulating water pump 23.
In the specific embodiment of the present invention, the high efficiency cyclone 13 is preferably connected with an induced draft fan 15, a tail gas scrubber 14 and a circulating pump 16 in sequence;
the induced draft fan 15 is connected with the rotary discharge valve 18 in parallel.
In the embodiment of the present invention, the apparatus for preparing a sewage/wastewater coagulant preferably further comprises an electrical instrument control system 17; the electrical instrument control system 17 is electrically connected with the copper smelting waste residue conveying device 27, the scraper conveyor 1, the spiral feeder 24, the stirring tank 25, the atomization mixing reactor 12, the tower reactor 8, the coil cooler 19, the sulfuric acid storage tank 7, the weighing sensor 26, the slurry intermediate tank 10, the cam metering pump 4, the first pressure stabilizing pipe 2, the second electromagnetic flow meter 20, the sulfuric acid metering pump 3, the second pressure stabilizing pipe 6, the first electromagnetic flow meter 5, the electric heater 9, the air blower 11, the efficient cyclone separator 13, the rotary discharge valve 18, the cam deceleration discharge motor 21, the circulating water tank 22, the circulating water pump 23, the induced draft fan 15, the tail gas washer 14 and the circulating pump 16 respectively. The effluent (washing water) from the tail gas scrubber 14 can be reused as stirring water in the stirring tank 25, and the discharge of waste gas, waste water and waste residues can be avoided.
The invention also provides a preparation method of the sewage coagulant, which comprises the following steps:
the preparation method is carried out in the device in the technical scheme;
adding the copper smelting waste residues in the copper smelting waste residue conveying device 27 into a stirring tank 25 sequentially through a scraper conveyor 1 and a spiral feeder 24, and then sequentially adding water and a composite catalyst into the stirring tank 25 to obtain slurry;
and simultaneously conveying the slurry and concentrated sulfuric acid in a sulfuric acid storage tank 7 to the atomization mixing reactor 12, combining in the tower reactor 8 in a spraying manner, carrying out catalytic reaction, and cooling by a coil cooler 19 to obtain the sewage/wastewater coagulant.
According to the invention, the copper smelting waste residue in the copper smelting waste residue conveying device 27 is added into the stirring tank 25 sequentially through the scraper conveyor 1 and the spiral feeder 24, and then water and the composite catalyst are sequentially added into the stirring tank 25 to obtain the slurry.
In the present invention, the composite catalyst preferably comprises an ionic rare earth oxide and iron powder atomized spherical alloy powder; the ionic rare earth oxide is not particularly limited in kind, and those known to those skilled in the art may be used. In the present invention, the particle size of the ionic rare earth oxide is preferably >400 mesh, more preferably >600 mesh; the particle size of the iron powder atomized spherical alloy powder is preferably 1000 meshes. In the present invention, the valence state of iron in the iron powder atomized spherical alloy powder is preferably 0 valence. In the invention, the mass ratio of the ionic rare earth oxide to the iron powder atomized spherical alloy powder is preferably (5.5-6.5): (3.5-4.5), and more preferably 6: 4. In the invention, the composite catalyst can strengthen the oxidation effect of concentrated sulfuric acid on the copper smelting waste residue (such as increasing the iron price and being beneficial to the polymerization of silicon-iron).
In the invention, the solid content of the slurry is preferably 60-75%. In the invention, the mass ratio of the copper smelting waste residue to the composite catalyst is preferably (25-43): (0.6-2.5).
In the present invention, the addition amounts of the copper-smelting waste slag, water and the composite catalyst are preferably controlled by a load cell 26.
In the invention, the water, the composite catalyst and the copper smelting waste slag are sequentially added into the stirring tank 25.
In the present invention, the stirring tank 25 is preferably in a stirring state during the above-mentioned preparation of the slurry, and the stirring rate is not particularly limited in the present invention, and the stirring is performed at a rate well known to those skilled in the art, and a slurry with a uniform mixture can be obtained.
After the slurry is obtained, the slurry and concentrated sulfuric acid in a sulfuric acid storage tank 7 are simultaneously conveyed into the atomization mixing reactor 12, are combined in the tower reactor 8 in a spraying mode and undergo a catalytic reaction, and then are cooled through a coil cooler 19 to obtain the sewage coagulant. In the present invention, the mass concentration of the concentrated sulfuric acid is preferably 98%. In the invention, the slurry and the concentrated sulfuric acid are preferably conveyed at high pressure, and the conveying pressure of the concentrated sulfuric acid is preferably 7-9 MPa; the conveying pressure of the slurry is preferably 0.5-3 MPa. In the present invention, the volume flow ratio of the slurry to the concentrated sulfuric acid to be conveyed is preferably 1.1: 1. the specific flow rate for delivering the slurry or delivering the concentrated sulfuric acid is not limited in the present invention, and the slurry or concentrated sulfuric acid may be delivered at a flow rate known to those skilled in the art.
In the present invention, the temperature of the catalytic reaction is preferably room temperature, and the catalytic reaction is preferably completed instantaneously.
After the catalytic reaction is finished, the invention preferably separates the materials in the tower reactor 8 through the high-efficiency cyclone separator 13, and conveys the solid materials to the coil cooler 19 through the rotary discharge valve 18 for cooling to obtain a sewage/wastewater coagulant; and (3) the tail gas scrubber 14 and the circulating pump 16 absorb the waste gas, discharge the waste gas to a water pool, and pump the waste gas into the stirring tank for recycling.
In the present invention, the cooling is preferably performed by circulating water cooling by connecting a cam deceleration discharging motor 21, a circulating water tank 22 and a circulating water pump 23 to the coil cooler 19.
The invention also provides a sewage coagulant prepared by the preparation method of the technical scheme, wherein the sewage coagulant comprises [ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2And O, wherein n is 1-3, and m is 7-9. In the present invention, [ Fe ] is2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2The mass ratio of O is preferably 4.5: 2.5: 3.
the technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The production process of the sewage concrete is carried out in the device shown in figure 1, and the concrete process is as follows:
adding the copper smelting waste residues in the copper smelting waste residue conveying device 27 into a stirring tank 25 sequentially through a scraper conveyor 1 and a spiral feeder 24, and then sequentially adding water and a composite catalyst (ionic rare earth oxide is a mixture of cerium oxide, samarium oxide, europium oxide and yttrium oxide, the mass ratio of the cerium oxide, the samarium oxide, the europium oxide and the yttrium oxide is 1:1.5:0.8: 0.9; the mass ratio of the ionic rare earth oxide and iron powder atomized spherical alloy powder is 6:4) into the stirring tank 25 to obtain slurry (the solid content is 72%, and the mass ratio of the copper smelting waste residues and the composite catalyst in the slurry is 1: 0.03);
the slurry and the concentrated sulfuric acid in the sulfuric acid storage tank 7 are simultaneously delivered (slurry and concentrated sulfuric acid)The volume flow ratio of (1.1): 1, wherein the delivery pressure of concentrated sulfuric acid is 7MPa, the delivery pressure of slurry is 3MPa) to the atomization mixing reactor 12, and after the concentrated sulfuric acid is combined in the tower reactor 8 in a spray form and catalytic reaction occurs, the materials in the tower reactor 8 are separated by a high-efficiency cyclone separator 13, and the rest materials are discharged after waste gas treatment by a draught fan 15, a tail gas scrubber 14 and a circulating pump 16 which are connected with the high-efficiency cyclone separator 13; the solid material is conveyed to a coil cooler 19 through a rotary discharge valve 18 for cooling to obtain a sewage coagulant ([ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2And O, wherein n is 1-3, and m is 7-9. Said [ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2Mass ratio of O4.5: 2.5: 3).
Example 2
The production process of the sewage concrete is carried out in the device shown in figure 1, and the concrete process is as follows:
adding the copper smelting waste residues in the copper smelting waste residue conveying device 27 into a stirring tank 25 sequentially through a scraper conveyor 1 and a spiral feeder 24, and then sequentially adding water and a composite catalyst (ionic rare earth oxide is a mixture of cerium oxide, samarium oxide, europium oxide and yttrium oxide, the mass ratio of the cerium oxide, the samarium oxide, the europium oxide and the yttrium oxide is 1:1.5:0.8: 0.9; the mass ratio of the ionic rare earth oxide and iron powder atomized spherical alloy powder is 6:4) into the stirring tank 25 to obtain slurry (the solid content is 72%, and the mass ratio of the copper smelting waste residues and the composite catalyst in the slurry is 1: 0.03);
simultaneously conveying the slurry and concentrated sulfuric acid in a sulfuric acid storage tank 7 (the flow ratio of the slurry to the concentrated sulfuric acid is 1.1: 1, wherein the conveying pressure of the concentrated sulfuric acid is 7MPa, and the conveying pressure of the slurry is 3MPa) to the slurryIn the atomization mixing reactor 12, after the materials are combined in the tower reactor 8 in a spray form and subjected to catalytic reaction, the materials in the tower reactor 8 are separated by a high-efficiency cyclone separator 13, and the rest materials are discharged after being subjected to waste gas treatment by a draught fan 15, a tail gas scrubber 14 and a circulating pump 16 which are connected with the high-efficiency cyclone separator 13; the solid material is conveyed to a coil cooler 19 through a rotary discharge valve 18 for cooling to obtain a sewage coagulant ([ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·.nH2O and FeSO4·nH2And O, wherein n is 1-3, and m is 7-9. Said [ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2Mass ratio of O4.5: 2.5: 3).
Test example
According to the mass ratio of the sewage coagulant to the sewage of 1:1000, the sewage coagulant prepared in example 1 is added into sewage 1 to be treated (Zhejiang Shaoxing medium printing and dyeing Co., Ltd.), the sewage coagulant prepared in example 2 is added into sewage 2 to be treated (Zhejiang Shaoxing medium printing and dyeing Co., Ltd.), and the sewage which is not treated by the sewage coagulant and the sewage after treatment are tested:
determination of pH: glass electrode method GB/T6920-1986;
determination of chemical oxygen demand: dichromate method HJ 828-;
and (3) measuring ammonia nitrogen: h J535-2009, a nano-reagent spectrophotometry method;
determination of total nitrogen: alkaline potassium persulfate digestion ultraviolet spectrophotometry HJ 636-2012;
measurement of suspended matter: gravimetric method GB/T11901-;
determination of total phosphorus: ammonium molybdate spectrophotometry GB/T11893-1989;
and (3) measuring the biochemical oxygen demand in five days: dilution and inoculation method HJ 505-.
The test results are shown in table 1:
TABLE 1 composition test results of untreated and treated wastewater
As can be seen from Table 1, the sewage coagulant prepared by the preparation method has a good effect on sewage treatment, and the detection indexes are superior to the industrial wastewater storage standard in Zhejiang.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A device for preparing a sewage/wastewater coagulant is characterized by comprising a copper smelting waste residue conveying device (27), a scraper conveyor (1), a spiral feeder (24), a stirring tank (25), an atomization mixing reactor (12), a tower reactor (8), a coil cooler (19) and a sulfuric acid storage tank (7);
the copper smelting waste residue conveying device (27), the scraper conveyor (1), the spiral feeder (24), the stirring tank (25), the atomization mixing reactor (12), the tower reactor (8) and the coil cooler (19) are sequentially connected;
the sulfuric acid storage tank (7), the atomization mixing reactor (12), the tower reactor (8) and the coil cooler (19) are connected in sequence.
2. The device according to claim 1, characterized in that the discharge opening of the agitator tank (25) is provided with a load cell (26);
a slurry intermediate tank (10), a cam metering pump (4), a first pressure-stabilizing pipe (2) and a second electromagnetic flowmeter (20) are sequentially connected between the stirring tank (25) and the atomization mixing reactor (12);
a sulfuric acid metering pump (3), a second pressure stabilizing pipe (6) and a first electromagnetic flow meter (5) are sequentially connected between the sulfuric acid storage tank (7) and the atomization mixing reactor (12);
the atomization mixing reactor (12) is sequentially connected with an electric heater (9) and a blower (11);
the electric heater (9) is respectively connected with the sulfuric acid storage tank (7) and the slurry intermediate tank (10) in parallel.
3. The apparatus according to claim 1, characterized in that a high-efficiency cyclone (13) and a rotary discharge valve (18) are connected in series between the column reactor (8) and the coil cooler (19); the tower reactor (8) is connected with the high-efficiency cyclone separator (13); the coil cooler (19) is connected with the rotary discharge valve (18);
the coil cooler (19) is connected with a cam deceleration discharging motor (21), a circulating water tank (22) and a circulating water pump (23).
4. The device according to claim 3, characterized in that the high efficiency cyclone separator (13) is connected with an induced draft fan (15), a tail gas scrubber (14) and a circulating pump (16) in sequence;
the induced draft fan (15) is connected with the rotary discharge valve (18) in parallel.
5. The device according to any one of claims 1 to 4, further comprising an electrical instrument control system (17);
the electric instrument control system (17) is respectively connected with the copper smelting waste residue conveying device (27), the scraper conveyor (1), the spiral feeder (24), the stirring tank (25), the atomization mixing reactor (12), the tower reactor (8), the coil cooler (19), the sulfuric acid storage tank (7), the weighing sensor (26), the slurry intermediate tank (10), the cam metering pump (4), the first pressure stabilizing pipe (2) and the second electromagnetic flowmeter (20), the device comprises a sulfuric acid metering pump (3), a second pressure stabilizing pipe (6), a first electromagnetic flow meter (5), an electric heater (9), an air blower (11), a high-efficiency cyclone separator (13), a rotary discharge valve (18), a cam speed-reducing discharge motor (21), a circulating water tank (22), a circulating water pump (23), an induced draft fan (15), a tail gas scrubber (14) and a circulating pump (16) which are electrically connected.
6. A preparation method of a sewage/wastewater coagulant is characterized by comprising the following steps:
the preparation method is carried out in the device of claim 1;
adding the copper smelting waste residues in the copper smelting waste residue conveying device (27) into a stirring tank (25) sequentially through a scraper conveyor (1) and a spiral feeder (24), and then sequentially adding water and a composite catalyst into the stirring tank (25) to obtain slurry;
and simultaneously conveying the slurry and concentrated sulfuric acid in a sulfuric acid storage tank (7) to the atomization mixing reactor (12), instantly combining in the tower reactor (8) in a spraying manner, carrying out catalytic reaction, and cooling by a coil cooler (19) to obtain the sewage/wastewater coagulant.
7. The method of claim 6, wherein the composite catalyst comprises an ionic rare earth oxide and an iron powder atomized spherical alloy powder;
the mass ratio of the ionic rare earth oxide to the iron powder atomized spherical alloy powder is (5.5-6.5): (3.5-4.5);
the solid content of the slurry is 60-75%;
the mass ratio of the copper smelting waste residues to the composite catalyst is (25-43): (0.6-2.5).
8. The method according to claim 6, wherein a ratio of a transport flow rate of the slurry to a transport flow rate of the concentrated sulfuric acid is (0.25 to 0.5): (0.5-0.75).
9. The method of claim 6, wherein the delivery of the slurry and the concentrated sulfuric acid is a high pressure delivery;
the conveying pressure of the concentrated sulfuric acid is 7-9 MPa;
the conveying pressure of the slurry is 0.5-3 MPa.
10. A sewage/wastewater coagulant produced by the production method according to any one of claims 6 to 9, said sewage coagulant comprising [ Fe ]2(SiO3)3(SO4)3·nH2O]m、Fe2(SiO3)3(SO4)3·nH2O and FeSO4·nH2And O, wherein n is 1-3, and m is 7-9.
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| PCT/CN2020/121422 WO2021227356A1 (en) | 2020-05-09 | 2020-10-16 | Apparatus for preparing sewage/wastewater coagulant, and sewage/wastewater coagulant and preparation method therefor |
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| WO2021227356A1 (en) * | 2020-05-09 | 2021-11-18 | 陈躬 | Apparatus for preparing sewage/wastewater coagulant, and sewage/wastewater coagulant and preparation method therefor |
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