CN111362385A - Method for treating river water polluted by antimony - Google Patents
Method for treating river water polluted by antimony Download PDFInfo
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- CN111362385A CN111362385A CN202010164144.6A CN202010164144A CN111362385A CN 111362385 A CN111362385 A CN 111362385A CN 202010164144 A CN202010164144 A CN 202010164144A CN 111362385 A CN111362385 A CN 111362385A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
Abstract
The invention relates to a method for treating antimony-polluted river water, belonging to the field of water pollution treatment. The method comprises the following steps: 1) the polluted river channel is cut off, a reactor is constructed, and a first lifting pump and a second lifting pump are arranged; 2) introducing the polluted water body into a reactor through a first lifting pump, adding a medicament to carry out antimony removal reaction, monitoring the total antimony content, immediately closing the first lifting pump when the content exceeds a standard, and simultaneously opening a second lifting pump; 3) after the liquid level of the water body in the reactor is reduced to a certain degree, the first lifting pump is started again, the second lifting pump is closed, and the antimony removal reaction is carried out repeatedly by adding a medicament; 4) and repeating the treatment processes of the steps 2) to 3) until the water body is qualified for treatment and is discharged. The method has the advantages of simple process and low cost, can quickly and efficiently remove antimony ions, and can be widely applied to emergency disposal of the river channel polluted by antimony.
Description
Technical Field
The invention discloses a method for treating river water polluted by antimony, and belongs to the technical field of water environment treatment.
Background
Antimony is an important industrial resource, but is also a potentially toxic and carcinogenic element, and excess amounts of antimony can affect human health and harm the environment. The concentration of antimony in drinking water source water is definitely regulated to be lower than 5 mu g/L in environmental quality standards issued by the State environmental protection Bureau of general administration of surface Water. In recent years, due to rapid industrial development, sudden water pollution events occur frequently, for example, tailings are leaked by certain antimony industry finite responsibility company at the end of 11 months in 2015, so that the concentration of antimony in a water body of a river reach more than 300 kilometers downstream exceeds the standard.
The prior methods for removing antimony comprise an adsorption method, an ion exchange method, a precipitation method and the like, and have the following problems in the application process: 1) although the adsorption method can effectively remove antimony, the adsorbent and the antimony compound have strong adsorption effect before, so that the regeneration and the reuse of the adsorbent have certain difficulty, and the cost is high; 2) the ion exchange effect is good, but the investment is large in the early stage of the treatment project, the resin regeneration cost is also quite large for recycling, and the water quantity of the emergency project is large, so that the ion exchange method is not suitable for treating the emergency project; 3) the coagulating sedimentation method is mainly used for forming precipitate or floccule of antimony in water so as to achieve the effect of removing antimony, and the method has the advantages of simple process, easy operation and less investment, and common precipitants comprise sulfide, ferric salt, aluminum salt and the like.
Through retrieval, for a method for removing antimony pollution in a water body, related application publications are disclosed in the prior art, for example, the application publication with the Chinese patent application number of 201611126272.1 and the publication date of 2017, 3, and 15 discloses an advanced treatment device for antimony-containing wastewater in a low-temperature environment, which comprises a water collecting tank, a No. 1 medicine dissolving tank, a primary coagulation tank, a stirrer, a primary sedimentation tank, a No. 2 medicine dissolving tank, a secondary coagulation tank, a secondary sedimentation tank and a clean water tank; the method of the application adopts a two-stage composite coagulation method, firstly sodium sulfide is added, coagulation reaction and precipitation are carried out, then polyferric sulfate is added for coagulation reaction, and water is discharged after precipitation. The method of the application has a complex treatment process, not only puts high requirements on treatment sites, but also has low treatment speed, and is not suitable for treating polluted river channels needing emergency treatment.
Based on the defects of the prior art, the emergency riverway water treatment method aiming at antimony pollution with high treatment efficiency is continuously invented.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of low treatment speed, complex treatment steps and low efficiency in the treatment of antimony-polluted emergency riverways, the method for treating the riverway water polluted by the antimony comprises the steps of partitioning the polluted riverways, constructing a reactor beside the riverways, introducing water into the reactor by using a first lifting pump, removing pollutants in the reactor, setting a water body backflow system according to whether the total antimony content exceeds the standard or not, forming a flow-type treatment system by the opening and closing cooperation of the first lifting pump and a second lifting pump, shortening the treatment time, enabling the reagent and the pollutants to be mixed more uniformly, and effectively improving the treatment efficiency.
Further, aiming at the defects that the pH value of the water body is sharply reduced and the coagulation treatment efficiency is low in the antimony removal treatment process in the prior art, the complex reagent adopted by the invention is prepared by mixing ferric chloride, sodium hydroxide, calcium hydroxide and water, so that the pH value of the water body in the flow reactor can be effectively maintained at a neutral level, and the high-efficiency antimony removal efficiency is maintained.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention provides an in-situ treatment method for river water polluted by antimony, which comprises the following steps:
step 1), a polluted river channel is cut off, a reactor is constructed in a polluted area, and a first lift pump for introducing a polluted water body into the reactor and a second lift pump for pumping the water body in the reactor back to the polluted area are arranged;
step 2), introducing the polluted water body into a reactor through a first lift pump, adding a medicament to carry out antimony removal reaction, monitoring the total antimony content in the reactor, immediately closing the first lift pump when the total antimony content exceeds the standard, and simultaneously opening a second lift pump; the standard for judging whether the total antimony content exceeds the standard refers to the drinking water standard of surface water.
Step 3), after the water level in the reactor is reduced to a certain degree, the first lift pump is started again, the second lift pump is closed, and the antimony removal reaction is carried out repeatedly by adding a medicament;
and 4) repeating the treatment processes of the steps 2) to 3) until the water body is qualified to be discharged, and discharging the generated sludge to a sludge plant for centralized treatment.
Aiming at the particularity of the river polluted by antimony and the harmfulness of the antimony-containing sludge, the method establishes a temporary reactor beside the river channel, the river channel polluted by antimony is treated to reach the standard and then returns to the river channel, and the generated antimony-containing sludge also ensures that the antimony-containing sludge can be fully treated and does not generate secondary pollution to the river channel.
According to the invention, the antimony concentration in the water body can be continuously diluted by the open-close matching of the first lift pump and the second lift pump in the treatment process, the water body which flows into the reactor again each time is the water body with reduced antimony concentration, the medicament and the pollutants are more uniformly mixed by continuously reducing the treatment limit, and the treatment efficiency is effectively improved.
As a further improvement of the invention, the medicament comprises an antimony removal medicament and a flocculation precipitation medicament, wherein the antimony removal medicament mainly utilizes ferric hydroxide to perform adsorption reaction on antimony ions, and the flocculation precipitation medicament is used for flocculation precipitation to accelerate solid-liquid separation.
As a further improvement of the invention, the antimony removal agent is a compound agent containing ferric chloride, sodium hydroxide, calcium hydroxide and water.
As a further improvement of the invention, the mass ratio of ferric chloride, sodium hydroxide, calcium hydroxide and water in the compound medicament is 8: 4: 2: (100-120).
As a further improvement of the invention, the addition amount of the compound medicament keeps the mass ratio of iron (ferric ion) to antimony (antimony ion) to be (4000-6000): 1.
as a further improvement of the invention, the specific process of adding the medicament in the step 2) and the step 3) to carry out the antimony removal reaction comprises the following steps:
s1, firstly, adding an antimony removal agent, and enabling the reaction time of the antimony removal agent and the polluted water body to be 20-40 min;
and S2, adding a flocculation precipitation medicament, wherein the flocculation precipitation medicament comprises a PAM medicament.
As a further improvement of the invention, the PAM medicament is a liquid medicament, the mass concentration is 1-2 per mill, and the dosage of the PAM medicament is 0.5-1 per mill of the mass of the polluted water body.
As a further improvement of the invention, the degree of the liquid level reduction of the water in the reactor in the step 2) is 1/2-2/3.
As a further improvement of the invention, the reactor is provided with an aeration device, an online detector and a decanter, wherein the aeration device is used for fully mixing the medicament and the water body in the antimony removal reaction, the online detector is used for monitoring the total antimony content online, and the decanter is used for filtering generated precipitates.
As a further improvement of the method, in the step 1), a cut-off dam is arranged at the border of the polluted river channel to cut off the polluted river channel, and a reactor is built at a position 5-10 m away from the polluted river channel.
As a further improvement, the method for treating the river water polluted by the antimony comprises the following specific steps:
1) starting a first lifting pump, pumping the polluted river water into the reactor, simultaneously starting a dosing device, conveying an antimony removal medicament, and feeding the antimony removal medicament and the polluted river water into the reactor;
2) under the action of aeration, the medicament and polluted river water fully react, antimony is adsorbed by utilizing the adsorption action of ferric hydroxide, and after the reaction is finished, a PAM medicament is added for flocculation and precipitation to accelerate solid-liquid separation;
3) the method comprises the following steps that an online monitor positioned at the tail end of a reactor monitors the total antimony content in real time, once the total antimony content exceeds the standard, a first lifting pump is closed immediately, a second lifting pump is started, river water in the reactor is pumped back to a polluted river channel, the second lifting pump is closed after the liquid level of the reactor drops to 1/2-2/3, and the first lifting pump is started again;
4) and the treated qualified river water flows to the river channel in a self-flowing mode.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the method for treating the river water polluted by the antimony establishes a temporary reactor beside the river, the polluted water is led into a reactor for treatment through the extraction of a pump, a medicament is added for removing antimony pollutants, meanwhile, the operation of the reactor is adjusted through the removal result of on-line monitoring, the antimony removal reaction process and the water inlet process of the invention are kept synchronous, namely, the aim of removing antimony pollutants is achieved in the process of continuously feeding water, a flow type treatment system is constructed, the system can ensure the continuous reaction only by controlling the opening and closing of the pump and the adding of the medicament, compared with the treatment in the prior art, the system does not need to be provided with a multi-stage sedimentation treatment system, meanwhile, the defect of overhigh cost caused by adding a large amount of medicaments due to overlarge treatment amount is avoided, and the flow treatment of the invention effectively improves the treatment speed.
(2) The method for treating the river water polluted by the antimony has the advantages that the water in the reactor can exceed the standard due to the fluidity of the treatment system and the running of the treatment system for a period of time, the method provided by the invention can be used for continuously carrying out the antimony removal reaction by blocking the water inlet and pumping a part of the water which does not reach the standard to the outside of the reactor by using the second lifting pump, and the opening and closing treatment of the pump is timely and effective in the process; in the prior art, the adding amount of the medicament is directly increased according to the standard exceeding condition of antimony pollution, so that a large amount of medicament is difficult to be uniformly mixed with a water body in a short time, the treatment efficiency is low, and the medicament is wasted. According to the flow type treatment system, the antimony concentration in the water body can be continuously diluted by the open-close matching of the first lift pump and the second lift pump in the treatment process, the water body which flows into the reactor again each time is the water body with the reduced antimony concentration, the medicament and pollutants are mixed more uniformly by continuously reducing the treatment limit, the medicament is saved, and the treatment efficiency can be effectively improved.
(3) The invention provides a method for treating river water polluted by antimony, which utilizes a compound medicament prepared by mixing ferric chloride, sodium hydroxide, calcium hydroxide and water as an antimony removal medicament, has higher treatment efficiency compared with the medicaments in the prior art, can achieve the complete removal effect only by adding a flocculating agent after the antimony removal medicament is added, but can cause the pH value of a water body to be rapidly reduced after flocculation and precipitation so as to reduce the removal efficiency, and in order to overcome the defects, other treatment systems or a multi-stage precipitation removal system needs to be coupled in the prior art, so that the treatment cost is higher, the compound medicament of the invention simultaneously compounds the sodium hydroxide and the calcium hydroxide which both have neutralization effects with the ferric chloride, and the formed compound reagent system not only can directly form the antimony removal ferric hydroxide, but also can effectively maintain the pH stability of a reaction system, the invention can effectively maintain the balance of the pH value of the water in the reactor in the flowing treatment system formed by the invention, so that the pH value is always maintained at a neutral level, and the high-efficiency antimony removal efficiency is kept.
(4) According to the method for treating the river water polluted by the antimony, the adopted compound reagent is prepared by mixing the ferric chloride, the sodium hydroxide, the calcium hydroxide and the water, the defect of poor subsequent flocculation effect caused by independently compounding the sodium hydroxide and the calcium hydroxide with the ferric chloride is overcome, and the subsequent flocculation effect can be remarkably improved by the compound reagent.
(5) According to the method for treating the antimony-polluted river water, the aeration system is arranged inside the reaction tank, so that the reagent and pollutants in the water body can be mixed more uniformly in an aeration mode, and an excellent treatment effect is ensured.
Drawings
FIG. 1 is a schematic diagram of the method for treating the river water polluted by antimony according to the invention,
in the figure: 1. a first lift pump; 2. a dosing device; 3. a reactor; 4. a sludge drying plant; 5. a second lift pump; 6. an on-line monitor; 7. an aeration device; 8. a water decanter.
Detailed Description
The invention will be further described with reference to the following specific examples, wherein the polluted river body is a polluted water body with excessive total antimony in some places and the water amount is about 5000m3The total antimony concentration is 60-100 mu g/L, and the pH value is 6-7.
Example 1
Setting a retaining dam at a place where a polluted river course is built, building a reactor 3 at a place 10m beside the polluted river course, wherein the external dimension of the reactor 3 is 5m by 5m, and the effective volume is 112.5m3As shown in fig. 1, the reactor 3 comprises an aeration device 7, an on-line detector 6 and a decanter 8, wherein the aeration device 7 is arranged at the bottom of the reactor 3 and is used for promoting the antimony removal medicament to be fully mixed with the water body; the online detector 6 is positioned at the tail end of the reactor 3 and is used for online monitoring of the total antimony content, the decanter 8 is used for filtering precipitates generated in the antimony removal process, and the generated precipitates are conveyed to the sludge drying plant 4. A first lifting pump 1 for guiding the polluted water body into a reactor 3 is arranged beside a river channel, and a second lifting pump 5 and a dosing device 2 for pumping the water body in the reactor 3 back to a polluted area are arranged beside the reactor 3.
The river water treatment method of the embodiment specifically comprises the following processes:
polluted river water is led into a reactor 3 through a first lifting pump 1, the water quantity is controlled, meanwhile, a dosing device 2 is started, a compound antimony removal medicament is conveyed, the antimony removal medicament is prepared by mixing ferric chloride, sodium hydroxide, calcium hydroxide and water, and the mass ratio of the ferric chloride, the sodium hydroxide, the calcium hydroxide and the water in the compound antimony removal medicament is 8: 4: 2: 100, keeping the mass ratio of iron to antimony as 4000: 1, namely 16.5kg of compound medicament per t of polluted water body;
the aeration device 7 is opened, the medicament and the polluted river water fully react under the action of aeration stirring, antimony is adsorbed by utilizing the adsorption action of ferric hydroxide, and after the reaction is finished for 20min, a PAM solution with the mass of 1 per thousand of the mass of the polluted water body is added, wherein the mass concentration of the PAM solution is 1 per thousand, flocculation precipitation is carried out, and solid-liquid separation is accelerated;
the online monitor 6 monitors the total antimony content in real time, once the total antimony content exceeds the standard, the first lifting pump 1 is closed immediately, the second lifting pump 5 is started, the water body in the reactor 3 is pumped back to the polluted river channel, the second lifting pump 5 is closed after the liquid level of the reactor 3 drops to 1/2-2/3, and the first lifting pump 1 is restarted;
and continuously repeating the process until the treatment is qualified, and allowing the treated qualified river water to flow to the river channel in a self-flowing manner. The generated sludge is conveyed to a sludge drying plant 4; through detection, the total antimony concentration of the treated water body is 0.12 mug/L, and reaches the standard of surface water drinking water (TP is less than or equal to 5 mug/L). The amount of the antimony removal agent consumed in the whole reaction process is 82.5t, wherein the amount of water accounts for 72.3t, and the amount of the PAM agent is 5 kg.
Example 2
Setting a retaining dam at the place where the polluted river course is built, building a reactor 3 at a position 10m beside the polluted river course, wherein the external dimension of the reactor 3 is 5m by 5m, and the effective volume is 112.5m3The structure of the reactor 3 was the same as in example 1.
Polluted river water is led into a reactor 3 through a first lifting pump 1, the water quantity is controlled, meanwhile, a dosing device 2 is started, a compound antimony removal medicament is conveyed, the compound antimony removal medicament is prepared by mixing ferric chloride, sodium hydroxide, calcium hydroxide and water, and the mass ratio of the ferric chloride, the sodium hydroxide, the calcium hydroxide and the water in the compound antimony removal medicament is 8: 4: 2: 110, keeping the mass ratio of iron to antimony at 5000: 1, namely 22kg of compound medicament per t of polluted water body;
the aeration device 7 is opened, the medicament and the polluted river water fully react under the action of aeration stirring, antimony is adsorbed by utilizing the adsorption action of ferric hydroxide, and after the reaction is finished for 30min, a PAM solution with the mass of 0.8 per thousand of the mass of the polluted water body is added, wherein the mass concentration of the PAM solution is 1.5 per thousand, flocculation precipitation is carried out, and solid-liquid separation is accelerated;
the online monitor 6 is used for monitoring the total antimony content in real time, once the total antimony content exceeds the standard, the first lifting pump 1 is immediately closed, the second lifting pump 5 is started, the water body in the reactor 3 is pumped back to the polluted river channel, the second lifting pump 5 is closed after the liquid level of the reactor 3 drops to 1/2-2/3, and the first lifting pump 1 is restarted;
and continuously repeating the processes until the treatment is qualified, wherein the qualified river water after the treatment flows to a river channel in a self-flowing mode, the generated sludge is conveyed to a sludge drying plant 4, and the total antimony concentration of the treated water body is 0.15 mu g/L and reaches the standard of surface water drinking water (TP is less than or equal to 5 mu g/L). The amount of the antimony removing agent consumed in the whole treatment process is 110t, wherein the amount of water accounts for 97.6t, and the amount of the PAM agent is 6 kg.
Example 3
Setting a retaining dam at the place where the polluted river course is built, building a reactor 3 at a position 10m beside the polluted river course, wherein the external dimension of the reactor 3 is 5m by 5m, and the effective volume is 112.5m3The structure of the reactor 3 was the same as in example 1.
Polluted river water is led into a reactor 3 through a first lifting pump 1, the water quantity is controlled, meanwhile, a dosing device 2 is started, a compound antimony removal medicament is conveyed, the compound antimony removal medicament is prepared by mixing ferric chloride, sodium hydroxide, calcium hydroxide and water, and the mass ratio of the ferric chloride, the sodium hydroxide, the calcium hydroxide and the water in the compound antimony removal medicament is 8: 4: 2: 120, keeping the mass ratio of iron to antimony to be 6000: 1, namely 29kg of compound medicament per t of polluted water body;
the aeration device 7 is opened, the medicament and the polluted river water fully react under the action of aeration stirring, antimony is adsorbed by utilizing the adsorption action of ferric hydroxide, and after the reaction is finished for 40min, a PAM solution with the mass of 0.5 per thousand of the mass of the polluted water body is added, wherein the mass concentration of the PAM solution is 2 per thousand, flocculation precipitation is carried out, and solid-liquid separation is accelerated;
the online monitor 6 monitors the total antimony in real time, once the content of the total antimony exceeds the standard, the first lift pump 1 is closed immediately, the second lift pump 5 is started, the water body in the reactor 3 is pumped back to the polluted river channel, the second lift pump 5 is closed after the liquid level of the reactor 3 drops by 1/2-2/3, and the first lift pump 1 is restarted;
and continuously repeating the process until the treatment is qualified, wherein the qualified river water after the treatment flows to a river channel in a self-flowing mode, and the generated sludge is conveyed to a sludge drying plant 4. The total antimony concentration of the treated water body is 0.11 mug/L, which reaches the standard of surface water drinking water (TP is less than or equal to 5 mug/L). The total amount of the antimony removing agent consumed is 145t, wherein the water accounts for 130t, and the amount of the PAM agent is 5 kg.
Comparative example A
Setting a retaining dam at the place where the polluted river course is built, building a reactor at a position 10m beside the polluted river course, wherein the external dimension of the reactor is 5m by 5m, and the effective volume is 112.5m3The structure of the reactor 3 was the same as in example 1.
The method comprises the following steps of introducing polluted river water into a reactor 3 through a first lift pump 1, controlling the water amount, simultaneously starting a dosing device 2, and conveying a compound antimony removal medicament, wherein compared with the embodiment 1, the compound antimony removal medicament is prepared by only mixing ferric chloride, sodium hydroxide and water, namely the compound medicament does not contain calcium hydroxide, and the mass ratio of the ferric chloride to the sodium hydroxide to the water in the compound medicament is 8: 6: 100, keeping the mass ratio of iron to antimony as 4000: 1, namely 16.5kg of compound medicament per t of polluted water body;
the aeration device 7 is opened, the medicament and the polluted river water fully react under the action of aeration stirring, antimony is adsorbed by utilizing the adsorption action of ferric hydroxide, and after the reaction is finished for 20min, a PAM solution with the mass of 1 per thousand of the mass of the polluted water body is added, wherein the mass concentration of the PAM solution is 1 per thousand, flocculation precipitation is carried out, and solid-liquid separation is accelerated;
the online monitor 6 monitors the total antimony content in real time, once the total antimony content exceeds the standard, the first lift pump 1 is closed immediately, the second lift pump 5 is started, river water in the reactor 3 is pumped back to a polluted river channel, the second lift pump 5 is closed after the liquid level in the reactor 3 drops to 1/2-2/3, and the first lift pump 1 is started again;
the above process is repeated continuously, the amount of the antimony removing agent consumed in the whole process is 82.5t, wherein the amount of water accounts for 72.3t, and when the amount of the PAM agent is 5kg, the result of monitoring the content of antimony in the water body in real time is 8.9 mug/L, so that the content of antimony in the water body can not reach the standard under the same agent dosage condition as that of the embodiment 1 of the invention, and the main reason is that the sludge flocculation effect is poor in the flocculation precipitation treatment process, so that part of antimony ions still exist in the water body.
Comparative example B
Comparative example B is essentially the same as reactor 3 and the specific treatment process of example 1, except that: the compound antimony removal medicament of the comparative example B is prepared by mixing ferric chloride, calcium hydroxide and water, namely the medicament does not contain sodium hydroxide, and the mass ratio of the ferric chloride to the calcium hydroxide to the water in the compound antimony removal medicament is 8: 8: 100, because calcium hydroxide is slightly soluble in water, the using amount of the calcium hydroxide is large when the preparation is prepared, the prepared preparation is viscous, the preparation cannot be added through a medicine adding device easily, the operation is difficult, and after the preparation is added, the calcium hydroxide which is not dissolved in the prepared preparation is dissolved in large-volume water sufficiently, so that the pH of the water is slightly alkaline, and the discharge requirement cannot be met.
Claims (10)
1. A method for treating river water polluted by antimony is characterized by comprising the following steps: the method comprises the following steps:
step 1), a polluted river channel is cut off, a reactor (3) is constructed at a polluted area, and a first lift pump (1) for introducing a polluted water body into the reactor (3) and a second lift pump (5) for pumping the water body in the reactor (3) back to the polluted area are arranged;
step 2), introducing the polluted water body into a reactor (3) through a first lifting pump (1), adding a medicament to carry out antimony removal reaction, monitoring the total antimony content in the reactor (3), immediately closing the first lifting pump (1) when the content exceeds a standard, and simultaneously opening a second lifting pump (5);
step 3), after the liquid level of the water body in the reactor (3) is reduced to a certain degree, the first lift pump (1) is started again, the second lift pump (5) is closed, and the antimony removal reaction is carried out repeatedly by adding a medicament;
and 4) repeating the treatment processes of the steps 2) to 3) until the water body is qualified for treatment and is discharged.
2. The method of claim 1, wherein the method comprises: the agent comprises an antimony removal agent and a flocculation precipitation agent, wherein the antimony removal agent mainly utilizes ferric hydroxide to perform adsorption reaction on antimony ions, and the flocculation precipitation agent is used for flocculation precipitation to accelerate solid-liquid separation.
3. The method for treating river water polluted by antimony according to claim 1 or 2, wherein: the antimony removal agent is a compound agent containing ferric chloride, sodium hydroxide, calcium hydroxide and water.
4. The method of claim 3, wherein the method comprises: the mass ratio of ferric chloride, sodium hydroxide, calcium hydroxide and water in the compound medicament is 8: 4: 2: (100-120).
5. The method of claim 4, wherein the method comprises: the adding amount of the compound medicament keeps the mass ratio of iron to antimony (4000-6000): 1.
6. the method of claim 2, wherein the method comprises: the specific process of adding the medicament in the step 2) and the step 3) to carry out the antimony removing reaction is as follows:
s1, firstly, adding an antimony removal agent, and enabling the reaction time of the antimony removal agent and the polluted water body to be 20-40 min;
and S2, adding a flocculation precipitation medicament, wherein the flocculation precipitation medicament comprises a PAM medicament.
7. The method of claim 6, wherein the method comprises: the PAM medicament is a liquid medicament, the mass concentration is 1-2 thousandths, and the adding amount of the PAM medicament is 0.5-1 thousandths of the mass of the polluted water body.
8. The method for treating river water polluted by antimony according to claim 1 or 2, wherein: the degree of the liquid level of the aqueous solution in the reactor (3) in the step 2) is 1/2-2/3.
9. The method of claim 8, wherein the method comprises: the reactor (3) is provided with an aeration device (7) and an online detector (6), in the operation process of the method, the aeration device (7) is used for fully mixing the antimony removal agent with the water body, and the online detector (6) is used for monitoring the total antimony content online.
10. The method of claim 9, wherein the method comprises: the mode for separating the polluted river channel in the step 1) is as follows: a cut-off dam is arranged at the border of the polluted river channel, the reactor (3) is also provided with a decanter (8), and in the operation process of the method, the decanter (8) is used for filtering the precipitate generated in the antimony removal process.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63236592A (en) * | 1987-03-26 | 1988-10-03 | Kurita Water Ind Ltd | Treatment of water containing antimony |
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