CN112174378A - Two-stage reaction combined advanced arsenic removal online water treatment method and treatment system thereof - Google Patents
Two-stage reaction combined advanced arsenic removal online water treatment method and treatment system thereof Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- 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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- 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
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
Abstract
The invention discloses a two-stage reaction combined advanced arsenic removal online water treatment method and a treatment system thereof, relating to the technical field of arsenic removal of industrial wastewater, and comprising four-stage operations of first-stage lime neutralization, filter pressing, second-stage advanced arsenic removal and clarification and separation, wherein the second-stage advanced arsenic removal specifically comprises the following steps: adding a hydrogen peroxide solution and a polymeric ferric sulfate solution into the filtrate obtained by filter pressing in sequence, adjusting the pH to 9-10 by using calcium hydroxide slurry, and adding a polyacrylamide solution for flocculation and sedimentation after the pH value is stable; in the clarification process, the mixed solution obtained by deeply removing arsenic in the second section is sent into a clarifier for clarification, and the supernatant at the upper end of the clarifier flows into the rear-end working procedure of wastewater treatment through an overflow port of the clarifier; and the slurry at the bottom of the clarifier is conveyed to a mixed liquid storage unit after the first-stage lime neutralization through a sludge discharge pump at the bottom of the clarifier, and the two are mixed and then are subjected to repeated filter pressing, second-stage deep arsenic removal and clarification separation. The invention greatly reduces the processing time and cost.
Description
Technical Field
The invention relates to the technical field of arsenic removal of industrial wastewater, in particular to a two-stage reaction combined advanced arsenic removal online water treatment method and a treatment system thereof.
Background
Arsenic is an element harmful to human bodies, arsenic and arsenide generally can enter human bodies through water, air, food and the like to cause harm, a large amount of arsenic elements are contained in a large amount of industrial wastewater at present, and arsenic removal is a necessary step for industrial wastewater treatment in order to reduce toxicity to the environment in the industrial wastewater treatment process.
The existing main methods for removing arsenic from industrial wastewater comprise a lime method, a vulcanization method, an iron salt method, an adsorption method, a biological method and the like. The lime method and the sulfuration method remove arsenic by generating precipitates from lime, sulfide and arsenic in wastewater. The method is suitable for treating high-concentration arsenic-containing wastewater, and is the main method for treating the arsenic-containing wastewater at present. But because a large amount of chemical agents are required to be added and come out in a precipitation form, the problem of secondary pollution exists; the iron salt method is to add a certain amount of iron salt (ferrous sulfate, etc.) into the waste water according to a certain iron-arsenic ratio and remove arsenic by coagulating sedimentation. The method has higher arsenic removal rate, but because a large amount of ferric salt needs to be added, the treatment cost is high, and the amount of waste residues is large; the adsorption method is to fix the arsenide on the surface of the adsorbent through stronger affinity between the pollutant and the adsorbent, thereby achieving the purpose of purifying and removing arsenic. The method is mainly applied to the field of purification of trace arsenic in water or drinking water, the application of the method to high-concentration arsenic-containing industrial wastewater is less, and the management and control of an adsorption material are main factors for restricting the application of the adsorption method; the biological method is to remove arsenic and heavy metals in water by utilizing microorganisms with special tolerance to arsenic and heavy metals through the actions of adsorption, catalytic conversion, complexing precipitation and the like. The method has the outstanding advantages of high treatment efficiency, no secondary pollution, low cost and the like, but has long treatment period and is not suitable for continuous arsenic removal treatment of industrial wastewater.
The patent application document with the publication number of CN107010751A discloses a comprehensive treatment method of high-concentration arsenic-containing acidic wastewater, which comprises three-stage treatment processes of neutralization precipitation treatment, oxidation precipitation treatment and advanced treatment, and the method realizes the deep removal of heavy metals in the wastewater, the COD content reaches the standard, the toxicity of the wastewater is reduced, the standard discharge of the wastewater is realized, and compared with the prior art, the process has the advantages of simple flow and relatively low cost.
However, the oxidation and the precipitation of the process are separately treated, the whole process takes more than several hours, and the problem of long treatment period is still not overcome; meanwhile, in order to further reduce the arsenic content, a heavy metal adsorption column is used for deep treatment, and the treatment cost is increased.
Disclosure of Invention
The invention aims to provide a two-stage reaction combined advanced arsenic removal online water treatment method and a treatment system thereof, and aims to solve the technical problems of long treatment period and high advanced treatment cost in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a two-stage reaction combined advanced arsenic removal online water treatment method comprises the following steps:
(1) first-stage lime neutralization: adding calcium hydroxide slurry into the wastewater, adjusting the pH value of a reaction system to 7-8, and neutralizing for 30 min;
(2) and (3) filter pressing: performing filter pressing on the mixed solution neutralized by the first-stage lime by using a filter press to respectively obtain filtrate and filter residues, and treating the filter residues as solid waste;
(3) two-stage deep arsenic removal: adding a hydrogen peroxide solution and a polymeric ferric sulfate solution into the filtrate obtained by filter pressing in sequence, deeply removing arsenic for 30min, then adjusting the pH to 9-10 by using calcium hydroxide slurry, deeply removing arsenic for 30min after the pH value is stable, and then adding a polyacrylamide solution for flocculation and sedimentation;
(4) clarification: the mixed solution obtained by the second-stage deep arsenic removal enters a clarifier for clarification, and the supernatant at the upper end of the clarifier flows into a rear-end process of wastewater treatment through an overflow port of the clarifier; and (3) conveying the slurry at the bottom of the clarifier to a mixed liquid storage unit after lime neutralization through a sludge discharge pump at the bottom of the clarifier, and repeating the steps (2) to (4) after mixing the slurry and the mixed liquid.
Preferably, in the step (1), the concentration of the calcium hydroxide slurry is 15-20 g/L, and the adding flow rate is 30-35L/min.
Preferably, the mixed liquor obtained after the first-stage lime is neutralized is stored in a thickener.
Preferably, in the step (3), the hydrogen peroxide solution is an industrial hydrogen peroxide solution with the mass concentration of 27-30%, and the adding flow rate is 0.012-0.013L/min; the concentration of the polymeric ferric sulfate solution is 10g/L, and the adding flow is 18-22 g/L; the concentration of the calcium hydroxide slurry is 15-20 g/L, and the adding flow rate is 1.0-1.5L/min; the concentration of the polyacrylamide solution is 2.5-5 per mill, and the adding flow rate is 0.05-0.1L/min.
The two-stage reaction combined advanced arsenic removal online water treatment system comprises a primary reaction tank for lime neutralization, a thickener for storing neutralized liquid, a filter press for solid-liquid separation of lime neutralized liquid, an intermediate storage tank for storing filtrate, a secondary reaction tank for two-stage advanced arsenic removal and a clarifier for solid-liquid separation advanced treatment liquid.
Preferably, the secondary reaction tank comprises a first-stage reaction tank and a second-stage reaction tank, the first-stage reaction tank is connected with a filtrate storage tank filled with filtrate, the second-stage reaction tank is connected with the clarifier through a launder, the first-stage reaction tank and the second-stage reaction tank are connected through a connecting channel, and a peristaltic pump for pumping in polyacrylamide solution is arranged on the connecting channel.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the pH value is strictly controlled, the first-stage lime neutralization pH value is 7-8, and the pH value for deeply removing arsenic of the second-stage polymeric ferric sulfate is 9-10, so that the arsenic removal rate can be stabilized above 99%, when the pH value for deeply removing arsenic of the second-stage polymeric ferric sulfate is greater than 10 or less than 9, the arsenic removal effect can be greatly reduced, and the arsenic removal rate is reduced to below 80%;
2. according to the invention, the bottom slurry for deeply removing arsenic from the two-stage polymeric ferric sulfate is pumped into the thickener and is finally treated together with the primary neutralized slag, the arsenic-removing slurry has certain adsorbability, arsenic can be further adsorbed after being mixed with the primary neutralized liquid in the thickener, the adsorption rate reaches 40%, the arsenic content in the primary neutralized liquid clear liquid entering the secondary reaction tank is reduced, the dosage of the medicament for deeply removing arsenic from the two-stage polymeric ferric sulfate is reduced, and a virtuous cycle is formed;
3. the two-stage polymeric ferric sulfate deep arsenic removal treatment has the advantages that the reaction time is greatly reduced, and the wastewater treatment efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the connection of the apparatus provided by the present invention;
FIG. 2 is a schematic view of the structure of the secondary reaction tank.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described below with reference to various embodiments, and the implementation manner of the present invention includes but is not limited to the following embodiments.
As shown in figure 1, a large-scale online water treatment system with two-stage reaction combined deep arsenic removal is provided, which comprises a primary reaction tank for lime neutralization, a thickener for storing neutralization liquid, a filter press for solid-liquid separation of lime neutralization liquid, an intermediate storage tank for storing filtrate, a secondary reaction tank for two-stage deep arsenic removal and a clarifier for solid-liquid separation of deep treatment liquid.
The secondary reaction tank comprises a first-stage reaction tank and a second-stage reaction tank, the first-stage reaction tank is connected with a filtrate storage tank filled with filtrate, the second-stage reaction tank is connected with the clarifier through a launder, the first-stage reaction tank and the second-stage reaction tank are connected through a connecting channel, and a peristaltic pump for pumping polyacrylamide solution is arranged on the connecting channel.
Example 1
The process of arsenic removal treatment of the desulfurization rare earth wastewater by using the equipment provided by the invention comprises the following steps: and (3) pumping the desulfurized rare earth wastewater into a primary reaction tank for lime neutralization, adding calcium hydroxide slurry (the adding flow is 30L/min, the concentration is 20g/L), testing by using wide test paper, and adjusting the pH of the primary neutralization reaction to 7-8. Naturally flowing the primary neutralization solution into the thickener through a launder after reacting for 30min, starting a delivery pump at the bottom of the thickener when the volume of the primary neutralization solution stored in the thickener is increased, pumping the primary neutralization solution into a filter press for filter pressing, flowing the filtrate into an intermediate storage tank, and detecting that the arsenic content of the filtrate is 7.11 mg/L. When the volume of the filtrate in the intermediate storage tank is increased, a conveying pump at the bottom of the intermediate storage tank is started to pump the filtrate into the first stage of the secondary reaction tank, simultaneously, hydrogen peroxide solution (with the adding flow rate of 0.012L/min and the concentration of 27 percent), polymeric ferric sulfate solution (with the adding flow rate of 20L/min and the concentration of 10g/L) and calcium hydroxide slurry (with the adding flow rate of 1.0L/min and the concentration of 20g/L) are sequentially pumped into the first stage of the secondary reaction tank by a pump, the secondary reaction tank is started to stir, adjusting the pH value of the first stage of the secondary reaction tank to 9-10 by a pH meter, deeply removing arsenic for 30min, allowing the reaction solution to flow into the second stage of the secondary reaction tank, adding polyacrylamide solution (with the addition flow rate of 0.05L/min and the concentration of 2.5 per mill) into the second stage of the secondary reaction tank through a peristaltic pump for flocculation and sedimentation, and after the second stage is filled with the reaction solution, allowing the reaction solution to flow into a clarifier through a launder. When the clarifier is full, the supernatant flows into the post-treatment process of wastewater through an overflow port, and the arsenic content of the supernatant is detected to be 0.023 mg/L. The waste slag is deposited at the bottom of the clarifier. When the arsenic removal work is carried out for about 8 hours, a sludge discharge pump at the bottom of the clarifier is started, arsenic removal slag is pumped into a thickener to be filter-pressed together with primary neutralized slag, the arsenic content of filtrate is detected to be 5.21mg/L, and the filter-pressed waste slag is pulled to a solid waste storage yard by a truck to be stacked in a centralized way and managed in a unified way.
The embodiment effectively combines the advantages of the lime method and the iron salt method, and can remove the arsenic content in the rare earth ore roasting flue gas absorption tail liquid from 10-20mg/L to less than 0.1mg/L by a two-stage combined deep arsenic removal mode, thereby achieving the emission standard of pollutants in the rare earth industry. Meanwhile, the treatment cost is low, and 1m of treatment is realized3The cost of the wastewater medicament is 1.5 yuan, and the method is suitable for large-scale continuous arsenic removal.
Example 2
The process of arsenic removal treatment of the desulfurization rare earth wastewater by using the equipment provided by the invention comprises the following steps: and (3) pumping the desulfurized rare earth wastewater into a primary reaction tank for lime neutralization, adding calcium hydroxide slurry (the adding flow is 30L/min, the concentration is 20g/L), testing by using wide test paper, and adjusting the pH of the primary neutralization reaction to 7-8. Naturally flowing the primary neutralization solution into the thickener through a launder after reacting for 30min, starting a delivery pump at the bottom of the thickener when the volume of the primary neutralization solution stored in the thickener is increased, pumping the primary neutralization solution into a filter press for filter pressing, flowing the filtrate into an intermediate storage tank, and detecting that the arsenic content of the filtrate is 7.40 mg/L. When the volume of the filtrate in the intermediate storage tank is increased, a conveying pump at the bottom of the intermediate storage tank is started to pump the filtrate into the first stage of the secondary reaction tank, simultaneously, hydrogen peroxide solution (with the adding flow rate of 0.012L/min and the concentration of 27 percent), polymeric ferric sulfate solution (with the adding flow rate of 20L/min and the concentration of 10g/L) and calcium hydroxide slurry (with the adding flow rate of 1.0L/min and the concentration of 20g/L) are sequentially pumped into the first stage of the secondary reaction tank by a pump, the secondary reaction tank is started to stir, adjusting the pH value of the first stage of the secondary reaction tank to 7-8 by a pH meter, deeply removing arsenic for 30min, allowing the reaction solution to flow into the second stage of the secondary reaction tank, adding polyacrylamide solution (with the addition flow rate of 0.05L/min and the concentration of 2.5 per mill) into the second stage of the secondary reaction tank through a peristaltic pump for flocculation and sedimentation, and after the second stage is filled with the reaction solution, allowing the reaction solution to flow into a clarifier through a launder. When the clarifier is full, the supernatant flows into the rear end process of wastewater treatment through an overflow port, and the arsenic content of the supernatant is detected to be 0.86 mg/L; the waste slag is deposited at the bottom of the clarifier. When the arsenic removal work is carried out for about 8 hours, a sludge discharge pump at the bottom of the clarifier is started, arsenic removal slag is pumped into a thickener to be filter-pressed together with primary neutralized slag, the arsenic content of filtrate is detected to be 4.74mg/L, and the filter-pressed waste slag is pulled to a solid waste storage yard by a truck to be stacked in a centralized way and managed in a unified way.
In the second-stage deep arsenic removal, the pH value of the first stage of the secondary reaction tank is adjusted to 7-8, compared with the example 1, the arsenic removal effect is greatly reduced, but the finally obtained slurry has a better adsorption effect.
Example 3
The process of arsenic removal treatment of the desulfurization rare earth wastewater by using the equipment provided by the invention comprises the following steps: and (3) pumping the desulfurized rare earth wastewater into a primary reaction tank for lime neutralization, adding calcium hydroxide slurry (the adding flow is 30L/min, the concentration is 20g/L), testing by using wide test paper, and adjusting the pH of the primary neutralization reaction to 7-8. Naturally flowing the primary neutralization solution into the thickener through a launder after reacting for 30min, starting a delivery pump at the bottom of the thickener when the volume of the primary neutralization solution stored in the thickener is increased, pumping the primary neutralization solution into a filter press for filter pressing, flowing the filtrate into an intermediate storage tank, and detecting that the arsenic content of the filtrate is 7.11 mg/L. When the volume of the filtrate in the intermediate storage tank is increased, a conveying pump at the bottom of the intermediate storage tank is started to pump the filtrate into the first stage of the secondary reaction tank, simultaneously, hydrogen peroxide solution (with the adding flow rate of 0.012L/min and the concentration of 27 percent), polymeric ferric sulfate solution (with the adding flow rate of 20L/min and the concentration of 10g/L) and calcium hydroxide slurry (with the adding flow rate of 1.0L/min and the concentration of 20g/L) are sequentially pumped into the first stage of the secondary reaction tank by a pump, the secondary reaction tank is started to stir, adjusting the pH value of the first stage of the secondary reaction tank to 11-12 by a pH meter, deeply removing arsenic for 30min, allowing the reaction solution to flow into the second stage of the secondary reaction tank, adding polyacrylamide solution (with the addition flow rate of 0.05L/min and the concentration of 2.5 per mill) into the second stage of the secondary reaction tank through a peristaltic pump for flocculation and sedimentation, and after the second stage is filled with the reaction solution, allowing the reaction solution to flow into a clarifier through a launder. When the clarifier is full, the supernatant flows into the rear end process of wastewater treatment through an overflow port, and the arsenic content of the supernatant is detected to be 1.12 mg/L; the waste slag is deposited at the bottom of the clarifier. When the arsenic removal work is carried out for about 8 hours, a sludge discharge pump at the bottom of the clarifier is started, arsenic removal slag is pumped into a thickener to be filter-pressed together with primary neutralized slag, the arsenic content of filtrate is detected to be 4.96mg/L, and the filter-pressed waste slag is pulled to a solid waste storage yard by a truck to be stacked in a centralized way and managed in a unified way.
In the second-stage deep arsenic removal, the pH value of the first stage of the secondary reaction tank is adjusted to 11-12, compared with the example 1, the arsenic removal effect is greatly reduced, but the finally obtained slurry has a better adsorption effect.
Example 4
The process of arsenic removal treatment of the desulfurization rare earth wastewater by using the equipment provided by the invention comprises the following steps: and (3) pumping the desulfurized rare earth wastewater into a primary reaction tank for lime neutralization, adding calcium hydroxide slurry (the adding flow is 30L/min, the concentration is 20g/L), testing by using wide test paper, and adjusting the pH of the primary neutralization reaction to 7-8. Naturally flowing primary neutralization solution into the thickener through a launder after reacting for 30min, starting a delivery pump at the bottom of the thickener when the volume of the primary neutralization solution stored in the thickener is increased, pumping the primary neutralization solution into a filter press for filter pressing, flowing filtrate into an intermediate storage tank, and detecting that the arsenic content of the filtrate is 7.32 mg/L. When the volume of the filtrate in the intermediate storage tank is increased, a conveying pump at the bottom of the intermediate storage tank is started to pump the filtrate into the first stage of the secondary reaction tank, simultaneously, hydrogen peroxide solution (with the adding flow rate of 0.012L/min and the concentration of 27 percent), polymeric ferric sulfate solution (with the adding flow rate of 20L/min and the concentration of 10g/L) and calcium hydroxide slurry (with the adding flow rate of 1.0L/min and the concentration of 20g/L) are sequentially pumped into the first stage of the secondary reaction tank by a pump, the secondary reaction tank is started to stir, adjusting the pH value of the first stage of the secondary reaction tank to 9-10 by a pH meter, deeply removing arsenic for 60min, allowing the reaction solution to flow into the second stage of the secondary reaction tank, adding polyacrylamide solution (with the addition flow rate of 0.05L/min and the concentration of 2.5 per mill) into the second stage of the secondary reaction tank through a peristaltic pump for flocculation and sedimentation, and after the second stage is filled with the reaction solution, allowing the reaction solution to flow into a clarifier through a launder. When the clarifier is full, the supernatant flows into the post-treatment process of wastewater through an overflow port, and the arsenic content of the supernatant is detected to be 0.022 mg/L. The waste slag is deposited at the bottom of the clarifier. When the arsenic removal work is carried out for about 8 hours, a sludge discharge pump at the bottom of the clarifier is started, arsenic removal slag is pumped into a thickener to be filter-pressed together with primary neutralized slag, the arsenic content of filtrate is detected to be 5.25mg/L, and the filter-pressed waste slag is pulled to a solid waste storage yard by a truck to be stacked in a centralized manner and managed in a unified manner.
Compared with example 1, the present example prolongs the deep arsenic removal time, but from the viewpoint of the detection data, the prolonged time has little influence on the arsenic removal effect.
Example 5
The process of arsenic removal treatment of the desulfurization rare earth wastewater by using the equipment provided by the invention comprises the following steps: and (3) pumping the desulfurized rare earth wastewater into a primary reaction tank for lime neutralization, adding calcium hydroxide slurry (the adding flow is 30L/min, the concentration is 20g/L), testing by using wide test paper, and adjusting the pH of the primary neutralization reaction to 7-8. Naturally flowing the primary neutralization solution into the thickener through a launder after reacting for 30min, starting a delivery pump at the bottom of the thickener when the volume of the primary neutralization solution stored in the thickener is increased, pumping the primary neutralization solution into a filter press for filter pressing, flowing the filtrate into an intermediate storage tank, and detecting that the arsenic content of the filtrate is 7.27 mg/L. When the volume of the filtrate in the intermediate storage tank is increased, a conveying pump at the bottom of the intermediate storage tank is started to pump the filtrate into the first stage of the secondary reaction tank, simultaneously, hydrogen peroxide solution (with the adding flow rate of 0.012L/min and the concentration of 27 percent), polymeric ferric sulfate solution (with the adding flow rate of 20L/min and the concentration of 10g/L) and calcium hydroxide slurry (with the adding flow rate of 1.0L/min and the concentration of 20g/L) are sequentially pumped into the first stage of the secondary reaction tank by a pump, the secondary reaction tank is started to stir, adjusting the pH value of the first stage of the secondary reaction tank to 9-10 by a pH meter, deeply removing arsenic for 10min, allowing the reaction solution to flow into the second stage of the secondary reaction tank, adding polyacrylamide solution (with the addition flow rate of 0.05L/min and the concentration of 2.5 per mill) into the second stage of the secondary reaction tank through a peristaltic pump for flocculation and sedimentation, and after the second stage is filled with the reaction solution, allowing the reaction solution to flow into a clarifier through a launder. When the clarifier is full, the supernatant flows into the rear end process of wastewater treatment through the overflow port, and the arsenic content of the supernatant is detected to be 0.32 mg/L. The waste slag is deposited at the bottom of the clarifier. When the arsenic removal work is carried out for about 8 hours, a sludge discharge pump at the bottom of the clarifier is started, arsenic removal slag is pumped into a thickener to be filter-pressed together with primary neutralized slag, the arsenic content of filtrate is detected to be 3.25mg/L, and the filter-pressed waste slag is pulled to a solid waste storage yard by a truck to be stacked in a centralized way and managed in a unified way.
Compared with the embodiment 1, the embodiment shortens the time for deeply removing arsenic to 10min, and the 10min has a slight influence on the final arsenic removal effect from the view of detection data; but the adsorption effect of the generated slurry is better.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (6)
1. A two-stage reaction combined advanced arsenic removal online water treatment method is characterized by comprising the following steps:
(1) first-stage lime neutralization: adding calcium hydroxide slurry into the wastewater, adjusting the pH value of a reaction system to 7-8, and neutralizing for 30 min;
(2) and (3) filter pressing: performing filter pressing on the mixed solution neutralized by the first-stage lime by using a filter press to respectively obtain filtrate and filter residues, and treating the filter residues as solid waste;
(3) two-stage deep arsenic removal: adding a hydrogen peroxide solution and a polymeric ferric sulfate solution into the filtrate obtained by filter pressing in sequence, adjusting the pH to 9-10 by using calcium hydroxide slurry, deeply removing arsenic for 30min after the pH value is stable, and then adding a polyacrylamide solution for flocculation and sedimentation;
(4) clarification: the mixed solution obtained by the second-stage deep arsenic removal enters a clarifier for clarification, and the supernatant at the upper end of the clarifier flows into a rear-end process of wastewater treatment through an overflow port of the clarifier; and (3) conveying the slurry at the bottom of the clarifier to a mixed liquid storage unit after lime neutralization through a sludge discharge pump at the bottom of the clarifier, and repeating the steps (2) to (4) after mixing the slurry and the mixed liquid.
2. The two-stage reaction combined advanced arsenic removal online water treatment method according to claim 1, wherein in the step (1), the concentration of the calcium hydroxide slurry is 15-20 g/L, and the adding flow rate is 30-35L/min.
3. The two-stage reaction combined advanced arsenic removal online water treatment method as claimed in claim 1, wherein the mixed liquor obtained after neutralization of the first-stage lime is stored in a thickener.
4. The two-stage reaction combined deep arsenic removal online water treatment method according to claim 1, wherein in the step (3), the hydrogen peroxide solution is an industrial hydrogen peroxide solution with a mass concentration of 27-30%, and the addition flow rate is 0.012-0.013L/min; the concentration of the polymeric ferric sulfate solution is 10g/L, the adding flow is 18-22L/min, and the iron-arsenic ratio is more than 5; the concentration of the calcium hydroxide slurry is 15-20 g/L, and the adding flow rate is 1.0-1.5L/min; the concentration of the polyacrylamide solution is 2.5-5 per mill, and the adding flow is 0.05-0.1L/min.
5. The two-stage reaction combined advanced arsenic removal online water treatment system is characterized by comprising a primary reaction tank for lime neutralization, a thickener for storing neutralization liquid, a filter press for solid-liquid separation of lime neutralization liquid, an intermediate storage tank for storing filtrate, a secondary reaction tank for two-stage advanced arsenic removal and a clarifier for solid-liquid separation advanced treatment liquid.
6. The two-stage reaction combined advanced arsenic removal online water treatment system according to claim 5, wherein the secondary reaction tank comprises a first-stage reaction tank and a second-stage reaction tank, the first-stage reaction tank is connected with a filtrate storage tank filled with filtrate, the second-stage reaction tank is connected with the clarifier through a launder, the first-stage reaction tank and the second-stage reaction tank are connected through a connecting channel, and a peristaltic pump for pumping polyacrylamide solution is arranged on the connecting channel.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140124447A1 (en) * | 2012-11-06 | 2014-05-08 | Thatcher Company | Formulations and methods for removing heavy metals from waste solutions containing chelating agents |
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2020
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| US20140124447A1 (en) * | 2012-11-06 | 2014-05-08 | Thatcher Company | Formulations and methods for removing heavy metals from waste solutions containing chelating agents |
| CN104787932A (en) * | 2015-04-29 | 2015-07-22 | 铜陵化学工业集团有限公司 | Treatment method of industrial arsenic wastewater |
| CN104829014A (en) * | 2015-06-03 | 2015-08-12 | 南宁市桂润环境工程有限公司 | Short-distance membrane separation treatment process for lead-zinc industrial beneficiation and smelting wastewater |
| CN109607872A (en) * | 2019-01-07 | 2019-04-12 | 紫金矿业集团股份有限公司 | A kind of comprehensive utilization of the waste acid containing arsenic and the Safe disposal method of arsenic |
| CN110590011A (en) * | 2019-09-10 | 2019-12-20 | 紫金矿业集团股份有限公司 | Stepped deep purification method for low-concentration arsenic-containing wastewater |
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