CN110963611A - Method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater - Google Patents
Method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater Download PDFInfo
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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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- 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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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- 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
- C02F2101/101—Sulfur 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic 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
- 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
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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Abstract
The invention discloses a method for removing lead-arsenic heavy metal, chromaticity and reducing substances in printing and dyeing wastewater. The invention has the advantages that: (1) the removal rate of the lead-arsenic composite pollutants can reach more than 90 percent, and particularly, the lead-arsenic composite pollutants have good effects on removing sulfides, decoloring, deodorizing, deoiling, sterilizing, dephosphorizing, reducing COD (chemical oxygen demand) and BOD (biochemical oxygen demand) of the wastewater; (2) the method uses a large amount of medicament in the sediment, and basically does not cause secondary pollution to the underground water; (3) the method is suitable for acid-base wastewater, and particularly has better treatment effect on alkaline wastewater; (4) the process flow is simple, and the matched device is simple and easy to control.
Description
Technical Field
The invention belongs to the technical field of underground polluted water treatment, and particularly relates to a method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater.
Background
At present, the mature method for treating the pollution of arsenic-containing wastewater with higher concentration mainly comprises the following steps: the pH value of the method is controlled to be 5-9 in the treatment process by an adsorption method, an iron salt precipitation method, an aluminum salt precipitation method, a sulfide precipitation method and the like. For lead-containing wastewater, the method is mature relatively and widely applied, such as an alkaline chemical precipitation method, an electrolysis method, a physical adsorption method and the like, and the pH value needs to be controlled between 8 and 10 in the treatment process. The difference between the treatment process and the treatment condition of the two heavy metal pollutants is larger, so that the existing method does not increase or not increase a reaction device to respectively remove the heavy metal pollutants in the sewage treatment of the composite pollution of the two heavy metal pollutants, and a method capable of treating the two heavy metal pollutants step by step is lacked. And the traditional lead-arsenic co-treatment method cannot well treat the problems of high chroma, high reducing substance and the like of the printing and dyeing wastewater.
Disclosure of Invention
The invention aims to provide a method for removing heavy metal lead arsenic, chromaticity and reducing substances in printing and dyeing wastewater, which comprises the steps of sequentially adding ferric salt, a coagulant and a flocculating agent with certain concentration into the initially precipitated underground polluted water, setting reaction time and stirring rate under the premise of controlling the pH environment of a reaction system, and fully reacting to promote removal of heavy metal lead arsenic, chromaticity and reducing substances in the underground polluted water.
The purpose of the invention is realized by the following technical scheme:
a method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater relates to underground polluted water formed by printing and dyeing wastewater, and is characterized by comprising the following steps:
(1) pumping underground polluted water into a primary sedimentation tank, separating large-particle silt through natural sedimentation, and pumping the underground polluted water after sedimentation into a reaction tank;
(2) adding a trivalent ferric salt into the underground polluted water in the reaction tank, and stirring for reacting for 10-30 minutes, wherein the added trivalent ferric salt accounts for 0.05-0.2% of the underground polluted water by mass;
(3) adding a coagulant with the mass concentration of 0.1-0.5% into the underground polluted water treated in the step (2), and stirring for reaction for 10-30 minutes;
(4) adjusting the pH value of the underground polluted water treated in the step (3) to 7-9, then adding a flocculating agent with the mass fraction of 5-20ppm into the underground polluted water, and stirring for reaction for 10-30 minutes;
(5) and (4) carrying out solid-liquid separation on the underground polluted water treated in the step (4) to obtain sludge and effluent, and filtering the effluent to obtain the underground water reaching the standard.
The ferric iron salt refers to Fe containing iron ions3+A salt.
The coagulant is one of polyaluminium chloride and polyferric sulfate.
In the step (4), for the alkaline underground polluted water, the PH value of the underground polluted water is adjusted to 7-9 by adding the coagulant; and adjusting the pH value of the acidic underground polluted water to be between 7 and 9 by adding an alkaline solution into the underground polluted water, wherein the alkaline solution is one or a combination of a calcium hydroxide solution, a strong sodium oxide solution and a strong potassium oxide solution.
The flocculating agent is one or a combination of more of polyacrylamide, polyaluminium chloride and polyferric sulfate.
The stirring speed of the stirring reaction is between 50 and 100 r/min.
The invention has the advantages that: (1) the removal rate of the lead-arsenic composite pollutants can reach more than 90 percent, and particularly, the lead-arsenic composite pollutants have good effects on removing sulfides, decoloring, deodorizing, deoiling, sterilizing, dephosphorizing, reducing COD (chemical oxygen demand) and BOD (biochemical oxygen demand) of the wastewater; (2) different from industrial wastewater, the underground water environment is complex and sensitive, the requirement on secondary pollution prevention and control is high during treatment, and the method uses a medicament which is polymerized in the sediment to basically avoid secondary pollution to the underground water; (3) the method is suitable for acid-base wastewater, and particularly has better treatment effect on alkaline wastewater; (4) the method has simple process flow, and the matched device is simple and easy to control.
Drawings
FIG. 1 is a schematic flow chart of the method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater according to the invention;
FIG. 2 is a statistical table of the addition gradients of ferric ions, coagulant and flocculant in test groups A1-A7 of the present invention;
FIG. 3 is a graph showing contaminant removal curves for test groups A1-A7 of the present invention;
FIG. 4 is a graph showing contaminant removal curves for test groups B1-B5 of the present invention;
FIG. 5 is a graph showing the contaminant removal rate curves for the test groups C1-C7 of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
example (b): in this embodiment, a place where printing and dyeing wastewater exists is used as a printing and dyeing mill workshop, and since a large amount of high-concentration and strong-alkalinity wastewater is generated in the processes of desizing, scouring, dyeing and the like, heavy metal pollutants such as arsenic, lead and the like are introduced into a color fixing section. Causing strong alkalinity of underground water in the field, serious pollution of arsenic and lead and the like. In the field test stage, an underground polluted water sample is collected, and the contents of heavy metal arsenic and lead are respectively 528 mug/L and 375 mug/L, the COD content is 664mg/L, the chroma is 256 times, and the pH value is 11.4.
As shown in fig. 1, the embodiment specifically relates to a method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater, which comprises the following steps:
(1) pumping underground polluted water polluted by printing and dyeing wastewater into a primary sedimentation tank, separating large-particle silt through natural sedimentation, and pumping the underground polluted water subjected to sedimentation into a reaction tank.
(2) After the underground polluted water in the reaction tank enters water, adding a ferric salt into the underground polluted water, and carrying out full stirring reaction for 10-30 minutes, wherein the mass ratio of the added ferric salt to the underground polluted water in the reaction tank is 0.05-0.2%; wherein the ferric salt refers to Fe containing iron ions3+A salt.
(3) Adding a coagulant with the mass concentration of 0.1-0.5% into the underground polluted water treated in the step (2), and stirring for reaction for 10-30 minutes; wherein the coagulant is one of polyaluminium chloride and polyferric sulfate.
(4) Adjusting the pH value of the underground polluted water treated in the step (3) to 7-9, then adding a flocculating agent with the mass fraction of 5-20ppm into the underground polluted water, and stirring for reaction for 10-30 minutes; wherein the flocculating agent is one or a combination of a plurality of polyacrylamide, polyaluminium chloride and polyferric sulfate;
it should be noted that the principle of controlling the PH of the underground polluted water to be 7-9 is as follows: for alkaline underground polluted water, the pH value range of 7-9 can be reached by adding a coagulant; for acidic underground polluted water, the pH value can be adjusted back to 7-9 by adding an alkaline solution, wherein the alkaline solution is one or a combination of a calcium hydroxide solution, a strong sodium oxide solution and a strong potassium oxide solution.
(5) And (4) standing and precipitating the underground polluted water treated in the step (4) for 10-30 minutes, carrying out solid-liquid separation to obtain sludge and effluent, and filtering the effluent to obtain the underground water reaching the standard.
It should be noted that, in the stirring reaction mentioned in each step of this example, the stirring rate should be controlled between 50 r/min and 100 r/min.
In order to obtain the removal effect of the lead-arsenic heavy metal, the chromaticity and the reducing substance under different conditions in the removal method of the embodiment, three series of tests are respectively performed:
first, adding gradient
As shown in the feeding gradient table in fig. 2, the ferric ions, coagulant and flocculant added in this example are fed in a gradient manner and are divided into six groups, namely a1, a2, A3, a4, a5 and a6, wherein the ferric ions are FeCl3Polyaluminium chloride is adopted as the coagulant (PAC), and polyacrylamide is adopted as the flocculant (PAM);
the test data obtained after processing according to the method steps in this example were obtained by performing each set of tests in sequence as shown in the following table:
the removal rate curve of each pollutant in the treated underground polluted water is shown in figure 3;
according to the above experimental data, the following are summarized: the arsenic and lead after treatment can meet the repair standard, wherein the removal rate of the arsenic is about 82.4-98.9%, and the removal rate of the lead is about 94.9-98.9%. And can synchronously solve the pollution problems of pH, chroma and the like in the underground polluted water. In comparison, the treatment groups A5 and A6 have better arsenic and lead removal rates, but more ferric chloride is introduced, and the most appropriate proportion is selected according to factors such as repair targets and project cost in practical application.
Second, comparison of removal effects due to pH variation
Test groups B1-B5 were set as shown in the following table, so that the ferric ions, the coagulant and the flocculant added in the present example were in the same ratio, but the pH values were different, wherein FeCl was used as the ferric ions3；
The test data obtained after processing according to the method steps in the present example, in which the sets of tests in the table above were performed in sequence, were as shown in the following table:
the removal rate curve of each pollutant in the treated underground polluted water is shown in FIG. 4;
according to the above experimental data, the following are summarized: in the set 5 groups of pH change environments, the removal effects of the chromaticity and the COD are positively correlated with the removal (precipitation) of arsenic and lead, which shows that the better the flocculation effect is, the better the removal effects of the chromaticity and the COD are; meanwhile, at the pH =8, the best arsenic and lead removal effect can be achieved. Under the condition of peracid or alkali, the formation of precipitate is not facilitated, and the removal effect of pollutants is poor.
Thirdly, the effect caused by lack of adding a certain medicament is compared
Test groups C1-C7 are set as shown in the following table, and except test group C1, one or two medicaments are not added in each of the rest test groups;
the test data obtained after processing according to the method steps in the present example, in which the sets of tests in the table above were performed in sequence, were as shown in the following table:
the removal rate curve of each pollutant in the treated underground polluted water is shown in fig. 5;
according to the above experimental data, the following are summarized: in addition tests of the three medicaments, whether ferric chloride is added or not strongly influences the arsenic removal effect, PAC is added to enhance the precipitate formation and decoloration effects, and PAM influences the heavy metal residual quantity of the final water body. This indicates that in the actual treatment process, one of the three agents is not necessary.
Claims (6)
1. A method for removing heavy metals of lead and arsenic, chromaticity and reducing substances in printing and dyeing wastewater relates to underground polluted water formed by printing and dyeing wastewater, and is characterized by comprising the following steps:
(1) pumping underground polluted water into a primary sedimentation tank, separating large-particle silt through natural sedimentation, and pumping the underground polluted water after sedimentation into a reaction tank;
(2) adding a trivalent ferric salt into the underground polluted water in the reaction tank, and stirring for reacting for 10-30 minutes, wherein the added trivalent ferric salt accounts for 0.05-0.2% of the underground polluted water by mass;
(3) adding a coagulant with the mass concentration of 0.1-0.5% into the underground polluted water treated in the step (2), and stirring for reaction for 10-30 minutes;
(4) adjusting the pH value of the underground polluted water treated in the step (3) to 7-9, then adding a flocculating agent with the mass fraction of 5-20ppm into the underground polluted water, and stirring for reaction for 10-30 minutes;
(5) and (4) carrying out solid-liquid separation on the underground polluted water treated in the step (4) to obtain sludge and effluent, and filtering the effluent to obtain the underground water reaching the standard.
2. The method for removing heavy metals of lead and arsenic, color and reducing substances in printing and dyeing wastewater according to claim 1, wherein the ferric salt is Fe containing iron ion3+A salt.
3. The method for removing heavy metals of lead and arsenic, chroma and reducing substances in printing and dyeing wastewater according to claim 1, wherein the coagulant is one of polyaluminium chloride and polyferric sulfate.
4. The method for removing heavy metals of lead and arsenic, color and reducing substances in printing and dyeing wastewater according to claim 3, characterized in that in the step (4), the pH value of the underground polluted water is adjusted to 7-9 by adding the coagulant to the underground polluted water which is alkaline; and adjusting the pH value of the acidic underground polluted water to be between 7 and 9 by adding an alkaline solution into the underground polluted water, wherein the alkaline solution is one or a combination of a calcium hydroxide solution, a strong sodium oxide solution and a strong potassium oxide solution.
5. The method for removing heavy metals of lead and arsenic, color and reducing substances in printing and dyeing wastewater according to claim 1, characterized in that the flocculating agent is one or more of polyacrylamide, polyaluminium chloride and polyferric sulfate.
6. The method for removing heavy metals of lead and arsenic, color and reducing substances in printing and dyeing wastewater as claimed in claim 1, wherein the stirring rate of the stirring reaction is 50-100 r/min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW593164B (en) * | 2003-07-30 | 2004-06-21 | Min-Shing Tsai | Integrated technology in sequential treatment of organics and heavy metal ions wastewater |
| CN103030233A (en) * | 2011-09-30 | 2013-04-10 | 深圳市明灯科技有限公司 | Treatment method for high-concentration arsenic waste water |
| CN103708649A (en) * | 2013-12-30 | 2014-04-09 | 河南省邦源环保工程有限公司 | Method for processing wastewater containing lead by combining flocculent precipitation with adsorption filtration |
| CN104556472A (en) * | 2014-12-05 | 2015-04-29 | 安徽华盛科技控股股份有限公司 | Treatment method and system for CIT heavy metal-containing sulfuric acid wastewater |
| CN109502723A (en) * | 2018-12-31 | 2019-03-22 | 上海勘察设计研究院(集团)有限公司 | A kind of Dying Wastewater Treatment & underground water discoloration method |
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- 2019-12-18 CN CN201911306044.6A patent/CN110963611A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW593164B (en) * | 2003-07-30 | 2004-06-21 | Min-Shing Tsai | Integrated technology in sequential treatment of organics and heavy metal ions wastewater |
| CN103030233A (en) * | 2011-09-30 | 2013-04-10 | 深圳市明灯科技有限公司 | Treatment method for high-concentration arsenic waste water |
| CN103708649A (en) * | 2013-12-30 | 2014-04-09 | 河南省邦源环保工程有限公司 | Method for processing wastewater containing lead by combining flocculent precipitation with adsorption filtration |
| CN104556472A (en) * | 2014-12-05 | 2015-04-29 | 安徽华盛科技控股股份有限公司 | Treatment method and system for CIT heavy metal-containing sulfuric acid wastewater |
| CN109502723A (en) * | 2018-12-31 | 2019-03-22 | 上海勘察设计研究院(集团)有限公司 | A kind of Dying Wastewater Treatment & underground water discoloration method |
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