CN114368870A - Magnetic separation method and separation system for heavy metal-containing rainwater - Google Patents

Magnetic separation method and separation system for heavy metal-containing rainwater Download PDF

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Publication number
CN114368870A
CN114368870A CN202210044463.2A CN202210044463A CN114368870A CN 114368870 A CN114368870 A CN 114368870A CN 202210044463 A CN202210044463 A CN 202210044463A CN 114368870 A CN114368870 A CN 114368870A
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China
Prior art keywords
reaction
rainwater
magnetic
box body
heavy metal
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Chinese (zh)
Inventor
潘力
倪誉苍
鲁伟
孙兰昆
李绍华
曹瀚文
黄晓恩
常江
杨智钦
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Yunnan Copper Co ltd Southwest Copper Branch
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Yunnan Copper Co ltd Southwest Copper Branch
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Priority to CN202210044463.2A priority Critical patent/CN114368870A/en
Publication of CN114368870A publication Critical patent/CN114368870A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/001—Runoff or storm water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Abstract

The invention discloses a magnetic separation method and a separation system for heavy metal-containing rainwater, wherein the separation method comprises the following steps: adding alkali liquor into rainwater containing heavy metals for reaction to obtain first reaction liquid; respectively adding polymeric ferric sulfate and magnetic seeds into the first reaction liquid for reaction to obtain a second reaction liquid; adding aluminum sulfate and polyacrylamide into the second reaction liquid respectively to react to obtain third reaction liquid; and carrying out solid-liquid separation on the third reaction liquid to obtain the rainwater with the magnetic sludge and the heavy metal content reaching the standard. Heavy metals in rainwater are settled by using alkali liquor, the hardness of the rainwater is reduced, polymeric ferric sulfate and magnetic seeds are added to make the sediment have magnetism and make arsenic in the rainwater settle, aluminum sulfate and polyacrylamide are added to make suspended matters in the rainwater settle, and solid-liquid separation is realized by using a magnetic separation technology, so that the aim of purifying the rainwater is fulfilled. The method has the advantages of simple operation, short process flow time and high separation efficiency.

Description

Magnetic separation method and separation system for heavy metal-containing rainwater
Technical Field
The invention relates to the technical field of initial rainwater treatment, in particular to a magnetic separation method and a separation system for rainwater containing heavy metals.
Background
At present, rain and sewage diversion work is carried out in copper smelting enterprises. However, because more raw materials and semi-finished products are transported by copper smelting enterprises, dust flies, so that more heavy metal-containing dust is on the ground, and the heavy metal in the initial rainwater part does not reach the discharge standard of pollutants for the copper nickel cobalt industry of GB 25467-2010.
Most of the initial rainwater treatment of some enterprises is combined with the general wastewater treatment and is treated uniformly. Some enterprises realize independent treatment of initial rainwater and ensure standard reaching rate and treatment capacity. The mature and common initial rainwater treatment process is a neutralization coagulation sedimentation process so as to achieve the initial rainwater reaching the standard. The principle is that the heavy metal can reach the standard by the characteristic that heavy metal hydroxide precipitates are insoluble, the purpose of sedimentation is achieved by a coagulation process, and the suspended matters can reach the standard. Most of rainwater treatment of the existing enterprises adopts a neutralization coagulation sedimentation process, a sedimentation tank is used for separating mud and water, the process flow time is long, the occupied area is large, and the investment is high.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a magnetic separation method and a separation system for heavy metal-containing rainwater, and aims to solve the problem that the treatment efficiency of the conventional metal smelting enterprises on initial rainwater is low.
The technical scheme of the invention is as follows:
a magnetic separation method of heavy metal-containing rainwater, comprising the following steps:
adding alkali liquor into rainwater containing heavy metals for reaction to obtain first reaction liquid;
sequentially adding polymeric ferric sulfate and magnetic seeds into the first reaction solution to react to obtain a second reaction solution;
adding aluminum sulfate and polyacrylamide into the second reaction liquid in sequence for reaction to obtain a third reaction liquid;
and carrying out solid-liquid separation on the third reaction liquid to obtain the rainwater with the magnetic sludge and the heavy metal content reaching the standard.
Optionally, the method for magnetically separating heavy metal-containing rainwater further includes: and adding the sludge containing magnetism into a magnetic seed recovery device for magnetic seed recovery to obtain magnetic seeds and demagnetized sludge.
Optionally, the method for magnetically separating heavy metal-containing rainwater includes that the alkali liquor is a mixed liquor of sodium hydroxide and sodium carbonate, and the concentration ratio of the sodium hydroxide to the sodium carbonate is 1-4: 1.
Optionally, the method for magnetically separating heavy metal-containing rainwater is characterized in that the magnetic seeds are modified ferrites.
Optionally, the method for magnetically separating heavy metal-containing rainwater, wherein the polyacrylamide is non-ionic, and the molecular weight is 900-1200 ten thousand.
A system for magnetic separation of heavy metal-containing stormwater, comprising:
the rainwater collecting tank is used for collecting rainwater on the ground;
the first pre-reaction box body is used for containing rainwater transferred by the rainwater collecting tank and alkali liquor which reacts with the rainwater;
the second pre-reaction box body is connected with the first pre-reaction box body through a pipeline and is used for containing a first reaction solution obtained after reaction in the first pre-reaction box body and polymeric ferric sulfate reacted with the first reaction solution;
the first mixing box body is connected with the second pre-reaction box body through a pipeline and is used for containing a second reaction liquid obtained after reaction in the second pre-reaction box body and magnetic seeds reacted with the second reaction liquid;
the second mixing box body is connected with the first mixing box body through a pipeline and is used for containing third reaction liquid obtained after reaction in the first mixing box body and aluminum sulfate reacted with the third reaction liquid;
the third mixing box body is connected with the second mixing box body through a pipeline and is used for containing a third reaction liquid obtained after reaction in the second mixing box body and polyacrylamide reacted with the third reaction liquid; and
and the precise magnetic separation equipment is used for carrying out solid-liquid separation on the third reaction liquid.
Optionally, the system for magnetically separating heavy metal-containing rainwater further includes:
and the magnetic seed recovery equipment is used for recovering the magnetic seeds in the magnetic solid obtained by the precise magnetic separation equipment.
Optionally, the system for magnetically separating heavy metal-containing rainwater further includes: the sedimentation tank is used for containing the demagnetized sludge obtained by the magnetic seed recovery equipment during magnetic seed recovery and settling the demagnetized sludge;
and the sludge dewatering equipment is used for dewatering the sludge obtained after the sedimentation of the sedimentation tank.
Optionally, the system for performing magnetic separation on rainwater containing heavy metals, wherein one or more of the first pre-reaction tank, the second pre-reaction tank, the first mixing tank, the second mixing tank and the third mixing tank is provided with a plurality of rollers at the bottom of the tank.
The method for magnetically separating the rainwater containing the heavy metals has the beneficial effects that the heavy metals in the rainwater are precipitated by using the alkali liquor, the hardness of the rainwater is reduced, the polymeric ferric sulfate and the magnetic seeds are added to ensure that the precipitate has magnetism and simultaneously ensure that arsenic in the rainwater is precipitated, the aluminum sulfate and the polyacrylamide are added to ensure that suspended matters in the rainwater are precipitated, and the aim of purifying the rainwater is fulfilled by utilizing a magnetic separation technology to realize solid-liquid separation. The method has the advantages of simple operation, short process flow time and high separation efficiency.
Drawings
FIG. 1 is a flow chart of a magnetic separation method for heavy metal-containing rainwater provided by the invention;
fig. 2 is a schematic diagram of a system for magnetically separating heavy metal-containing rainwater provided by the invention.
Detailed Description
The invention provides a magnetic separation method for heavy metal-containing rainwater, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the units indicating the content of the raw materials are all in parts by mass. Other raw materials and reagents not specifically mentioned in the present invention are those generally used in the art.
Referring to fig. 1, fig. 1 is a flow chart of a method for magnetically separating heavy metal-containing rainwater provided by the present invention, the method includes the following steps:
s10, adding the alkali liquor into the rainwater containing the heavy metals for reaction to obtain a first reaction liquid.
Specifically, the alkali solution may be a sodium hydroxide solution, a potassium hydroxide solution, or a mixed solution of a sodium hydroxide solution and a sodium carbonate solution. When the alkali liquor is a mixed solution of a sodium hydroxide solution and a sodium carbonate solution, the ratio concentration of the sodium hydroxide solution to the sodium carbonate solution can be 1:1, 3: 1. 4:1, and so on. It is easy to understand that the alkali liquor can also be a mixed solution prepared by mixing sodium hydroxide and sodium carbonate according to a certain proportion. The concentration of adding of alkali lye can be added according to the content of heavy metal ion in the rainwater, that is to say, before adding alkali lye, can carry out analysis and detection to the rainwater, detect the content of heavy metal ion in the rainwater, select the concentration and the quantity of adding alkali lye according to the testing result. The detection method for heavy metal ions is a detection method commonly used in the prior art, and is not limited herein.
Furthermore, by adding the alkali liquor into the rainwater containing heavy metals, heavy metal ions in the rainwater can be precipitated in an alkaline environment and are primarily separated from the rainwater, so that the hardness of the rainwater is reduced. The first reaction liquid refers to the rainwater after the heavy metal ions in the rainwater are flocculated after alkali liquor is added and stirring reaction is carried out.
Step S20 is included after the step S10, polymeric ferric sulfate and magnetic seeds are respectively added into the first reaction liquid for reaction, and a second reaction liquid is obtained.
Specifically, polymeric ferric sulfate, which may be a liquid having a mass fraction of total iron of 11% or more, may be added to the first reaction solution under stirring. Wherein, the polyferric sulfate belongs to an inorganic ferric salt coagulant, and the pH value of the product is acidic. The polymeric ferric sulfate is added to precipitate the arsenic in the rainwater, so that the arsenic reaches the standard.
Further, the pH value of the first reaction liquid is adjusted to be 7-11, such as 7-10, when the pH value of the first reaction liquid is less than 7, the hydroxide precipitation and the calcium carbonate precipitation are subjected to a re-dissolution phenomenon, and the removal effect of heavy metals and hardness is influenced.
Furthermore, the magnetic seed is modified ferrite, the iron content is 98.7%, and the proportioning concentration is 20-30%. Wherein the ferrite is a composite oxide consisting of iron and other one or more metals. Such as spinel type ferrites, of the formula MeFe2O4Or MeO. Fe2O3Wherein Me is the ionic radius and the divalent iron ion (Fe)2+) Divalent metal ions of close proximity (e.g. Mn)2+、Zn2+、Cu2+、Ni2+、Mg2+、Co2+Etc.) or a plurality of metal ions whose average chemical valence is divalentAnd (4) grouping. It has magnetic attraction, and when the magnetic attraction and the precipitation are adsorbed together, the precipitation can have certain magnetism. The addition amount of the ferrite can be adjusted according to the content of heavy metals in rainwater, and the specific addition amount is not limited herein. The second reaction solution is a solution obtained after polymeric ferric sulfate and magnetic seeds are added for reaction.
And a step S30 of adding aluminum sulfate and polyacrylamide to the second reaction liquid respectively to react to obtain a third reaction liquid after the step S20.
Specifically, the aluminum sulfate is used as a flocculating agent, the flocculation can be assisted by adding the aluminum sulfate, and the proportioning concentration of the aluminum sulfate is 10%; the polyacrylamide is non-ionic, the molecular weight is 900-1200 ten thousand (such as 1000 ten thousand), and the matching concentration is 1 per thousand. The suspended substances in the rainwater can be separated from the rainwater through precipitation by adding polyacrylamide.
And S40 is further included after the step S30, solid-liquid separation is carried out on the third reaction liquid, and rainwater with magnetic sludge and heavy metal content reaching standards is obtained.
Particularly, the solid-liquid separation can be carried out by adopting a magnetic recovery device, the magnetic disc and the magnetic cylinder in the magnetic separator are used for adsorbing sediment wrapped by magnetic seeds, the quick separation from water is realized, and the sludge is subjected to flocculation decomposition to realize the recovery and utilization of the magnetic seeds. The heavy metal content of the rainwater reaching the standard means that the treated rainwater reaches GB25467-2010 emission Standard of pollutants for copper Nickel cobalt industry.
In an implementation manner of this embodiment, after the step S30, the method further includes: and (3) introducing the sludge obtained after magnetic recovery into a sedimentation tank for sedimentation, and performing sludge-water separation after sedimentation, wherein the separated water is standard water.
As shown in fig. 2, based on the same inventive concept, the present invention also provides a system for magnetically separating heavy metal-containing rainwater, comprising: the system comprises a rainwater collecting pool 10 for collecting rainwater on the ground, a first pre-reaction box body 20 for containing rainwater transferred by the rainwater collecting pool and alkali liquor for reacting with the rainwater, and a second pre-reaction box body 30 which is connected with a pipeline of the first pre-reaction box body and is used for containing a first reaction solution obtained after reaction in the first pre-reaction box body and polyferric sulfate for reacting with the first reaction solution, wherein the rainwater in the rainwater collecting pool 10 is pumped into the first pre-reaction box body 20 through a pump body 11; a first mixing box 40 connected with the second pre-reaction box through a pipeline and used for containing a second reaction liquid obtained after the reaction in the second pre-reaction box and magnetic seeds reacted with the second reaction liquid; a second mixing box 50 connected to the first mixing box through a pipeline and used for containing a third reaction solution obtained after the reaction in the first mixing box and aluminum sulfate reacted with the third reaction solution; a third mixing box 60 connected to the second mixing box through a pipeline and used for containing a third reaction solution obtained after the reaction in the second mixing box and polyacrylamide reacted with the third reaction solution; and a precise magnetic separation device 70 for performing solid-liquid separation on the third reaction solution. It should be noted that the specifications of the first pre-reaction tank, the second pre-reaction tank, the first mixing tank, the second mixing tank and the third mixing tank can be set as required, and the material of each tank can be stainless steel. The precise magnetic separation equipment is magnetic recovery equipment commonly used in the prior art, and the specific structure of the precise magnetic separation equipment is not limited herein.
Every box all adopts the mode that upper portion feed liquor lower part goes out liquid to set up, for example take out the rainwater of rainwater collecting pit 10 inside to first pre-reaction box 20 in with the water pump in, then can a inlet (not shown) is seted up on the upper portion of first pre-reaction box, and the inlet passes through the pipeline to be connected with the water pump liquid outlet first pre-reaction box 20's lower part sets up liquid outlet (not shown), and this liquid outlet carries out the pipe connection through the inlet on pipeline and second pre-reaction box 30 upper portion to analogize from this. It is easy to understand that a mechanical stirring device can be arranged beside each reaction box body, and the added alkali liquor, the polymeric ferric sulfate, the magnetic seeds, the aluminum sulfate and the polyacrylamide are uniformly dispersed by the stirring device.
In this embodiment, the flowing of the liquid between the boxes can be realized by utilizing the self-flowing of the liquid, a stirring device is arranged in each box, the stirring device stirs the liquid in the box to move, i.e. power is provided for the flowing of the liquid, and the flowing of the liquid between the boxes can be realized by utilizing the power. Simultaneously, can also install the gyro wheel in the bottom of box, if the box is the cuboid, install the gyro wheel on four angles of the bottom of cuboid box, can carry out convenient removal to the box through installing the gyro wheel.
In this embodiment, compare in prior art need not to reuse the sedimentation tank, with higher speed clarification tank and valveless filtering pond, saved area, set each reaction vessel to the box structure, form the modularization, the installation of modularization integration makes the installation rate faster, also is convenient for remove and remove.
In an implementation manner of this embodiment, the system for magnetically separating heavy metal-containing rainwater further includes: a magnetic seed recovery apparatus (not shown), a settling tank (not shown), and a sludge dewatering apparatus (not shown). And mechanically crushing the magnetic solid obtained by the precise magnetic separation equipment, adding the crushed solid into the magnetic seed recovery equipment, recovering the magnetic seeds in the magnetic seed recovery equipment, and adsorbing the magnetic powder dispersed in the solid. The recycling of the magnetic powder is realized. And the sludge slurry discharged from the magnetic seed recovery equipment flows into a sedimentation tank for sedimentation, and after sedimentation, mud-water separation is carried out, so that the rainwater is finally treated.
The following provides a further explanation of the magnetic separation method and separation system for heavy metal-containing rainwater provided by the present invention through specific preparation examples.
Example 1
The separation system in the embodiment is adopted to separate the rainwater, and the rainwater in the rainwater collection pool is detected, so that the heavy metal content of the initial rainwater is 0.87mg/l of copper, 0.08mg/l of arsenic, 0.08mg/l of lead, 4.64mg/l of zinc, 0.08mg/l of cadmium and 0.07mg/l of nickel. The processing capacity of the separation system was 300m3The dosage of the medicament is 0.65m of alkali liquor3Per hour, 0.31m of polymeric ferric sulfate3Per hour, magnetism 10kg/h, aluminum sulfate 0.1m3H; 0.05mg/l of copper, 0.01mg/l of arsenic, 0.01mg/l of lead and 0.08mg/l of zinc in effluent,0.01mg/l of cadmium, 0.01mg/l of nickel, 8mg/l of suspended matters and 13mg/l of COD, and the standard is stably reached. And introducing the water reaching the standard into a clean water tank.
Example 2
The separation system in the embodiment is adopted to separate rainwater, the rainwater in the rainwater collection pool is detected, the heavy metal content in the initial rainwater is 0.79mg/l of copper, 0.31mg/l of arsenic, 0.07mg/l of lead, 7.35mg/l of zinc, 0.23mg/l of cadmium and 0.03mg/l of nickel, and the treatment capacity is 300m3The dosage of the medicament is 0.56m of alkali liquor3Per hour, 0.3m of polymeric ferric sulfate3H, 8.5m of magnetic seed3H, aluminium sulphate 0.08m3H; 0.04mg/l of copper, 0.02mg/l of arsenic, 0.01mg/l of lead, 0.26mg/l of zinc, 0.01mg/l of cadmium, 0.01mg/l of nickel, 14mg/l of suspended matters and 6mg/l of COD in the effluent, and the stability reaches the standard. And introducing the water reaching the standard into a clean water tank.
Comparative example
The original process comprises the following steps: the heavy metal content of the initial rainwater, copper 0.57mg/l, arsenic 0.24mg/l, lead 0.06mg/l, zinc 5.7mg/l, cadmium 0.09mg/l and nickel 0.05mg/l are mixed with the general wastewater to adopt a neutralization coagulation precipitation process, and the processing capacity of the process is 400m3Per hour, the amount of waste water is generally 200 to 300m3The capacity of treating initial rainwater is 100-200m3And/h, the capacity of treating initial rainwater abundantly is low. The initial rainwater is treated by the original common wastewater treatment process and is recycled after reaching the standard, but the treatment capacity is limited, so that the risk of insufficient treatment of the initial rainwater exists.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (9)

1. A magnetic separation method of heavy metal-containing rainwater is characterized by comprising the following steps:
adding alkali liquor into rainwater containing heavy metals for reaction to obtain first reaction liquid;
sequentially adding polymeric ferric sulfate and magnetic seeds into the first reaction solution to react to obtain a second reaction solution;
adding aluminum sulfate and polyacrylamide into the second reaction liquid in sequence for reaction to obtain a third reaction liquid;
and carrying out solid-liquid separation on the third reaction liquid to obtain the rainwater with the magnetic sludge and the heavy metal content reaching the standard.
2. The magnetic separation method of heavy metal-containing rainwater according to claim 1, characterized by further comprising the steps of: and adding the sludge containing magnetism into a magnetic seed recovery device for magnetic seed recovery to obtain magnetic seeds and demagnetized sludge.
3. The magnetic separation method for heavy metal-containing rainwater according to claim 1, wherein the alkali liquor is a mixed liquor of a sodium hydroxide solution and a sodium carbonate solution, and the mass concentration ratio of the sodium hydroxide solution to the sodium carbonate solution is 1-4: 1.
4. The magnetic separation method of heavy metal-containing rainwater according to claim 1, wherein the magnetic species is a modified ferrite.
5. The magnetic separation method for heavy metal-containing rainwater as claimed in claim 1, wherein the polyacrylamide is non-ionic and has a molecular weight of 900-1200 ten thousand.
6. A system for magnetic separation of heavy metal-containing stormwater, comprising:
the rainwater collecting tank is used for collecting rainwater on the ground;
the first pre-reaction box body is used for containing rainwater transferred by the rainwater collecting tank and alkali liquor which reacts with the rainwater;
the second pre-reaction box body is connected with the first pre-reaction box body through a pipeline and is used for containing a first reaction solution obtained after reaction in the first pre-reaction box body and polymeric ferric sulfate reacted with the first reaction solution;
the first mixing box body is connected with the second pre-reaction box body through a pipeline and is used for containing a second reaction liquid obtained after reaction in the second pre-reaction box body and magnetic seeds reacting with the second reaction liquid;
the second mixing box body is connected with the first mixing box body through a pipeline and is used for containing third reaction liquid obtained after reaction in the first mixing box body and aluminum sulfate reacted with the third reaction liquid;
the third mixing box body is connected with the second mixing box body through a pipeline and is used for containing a third reaction liquid obtained after reaction in the second mixing box body and polyacrylamide reacted with the third reaction liquid; and
and the precise magnetic separation equipment is used for carrying out solid-liquid separation on the third reaction liquid.
7. The system for magnetic separation of heavy metal-containing stormwater according to claim 6, further comprising:
and the magnetic seed recovery equipment is used for recovering the magnetic seeds in the magnetic solid obtained by the precise magnetic separation equipment.
8. The system for magnetic separation of heavy metal-containing stormwater according to claim 7, further comprising: the sedimentation tank is used for containing the demagnetized sludge obtained by the magnetic seed recovery equipment during magnetic seed recovery and settling the demagnetized sludge;
and the sludge dewatering equipment is used for dewatering the sludge obtained after the sedimentation of the sedimentation tank.
9. The system for magnetically separating rainwater containing heavy metals according to claim 6, wherein one or more of the first pre-reaction tank, the second pre-reaction tank, the first mixing tank, the second mixing tank and the third mixing tank is provided with a plurality of rollers at the bottom of the tank.
CN202210044463.2A 2022-01-14 2022-01-14 Magnetic separation method and separation system for heavy metal-containing rainwater Pending CN114368870A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601021A (en) * 2015-12-21 2016-05-25 广西壮族自治区环境保护科学研究院 Treatment method of heavy metal waste water

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601021A (en) * 2015-12-21 2016-05-25 广西壮族自治区环境保护科学研究院 Treatment method of heavy metal waste water

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