CN114262085A - Method for treating arsenic-containing wastewater - Google Patents
Method for treating arsenic-containing wastewater Download PDFInfo
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- CN114262085A CN114262085A CN202111420935.1A CN202111420935A CN114262085A CN 114262085 A CN114262085 A CN 114262085A CN 202111420935 A CN202111420935 A CN 202111420935A CN 114262085 A CN114262085 A CN 114262085A
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Abstract
The application discloses a method for treating arsenic-containing wastewater, which comprises the following steps: adding aluminum phosphide treatment residues and composite ferric salt into arsenic-containing wastewater, stirring uniformly to enable the reaction to be complete, adding lime to adjust the pH value of the wastewater to 8-9, stirring uniformly to enable the reaction to be complete, and adding a flocculating agent to perform flocculation precipitation. The application solves the technical problems of long processing process and poor economy in the prior art.
Description
Technical Field
The application relates to the technical field of wastewater treatment, in particular to a method for treating arsenic-containing wastewater.
Background
As and the arsenic-containing compounds have larger toxicity, and As (III) has much higher toxicity than As (V), which can damage the liver, kidney, nerves and the like of people. Once the pollution of arsenic to the environment is formed, the pollution to water and soil is difficult to eliminate in the environment, and the arsenic can finally enter human bodies through food chains or ground water and underground water to damage human health, so that the poisoning event of people and livestock is generated. The pollution and harm of arsenic-containing waste residues generated in the smelting process and the waste residues containing arsenic and the like generated in the treatment of waste water and waste acid to the environment are not thoroughly cured at present, and some places contain arsenic-containing waste residues which are stored in the open air arbitrarily and have great harm to the environment. For a long time, the main disposal method of arsenic-containing waste residues in China is safe landfill after solidification/stabilization. After the landfill, leachate waste water containing arsenic is discharged from the landfill, and if the leachate waste water is not treated in time, secondary pollution to the environment is caused. If the wastewater flows to creeks, farmlands and the like, serious pollution to the surrounding environment is caused for a long time.
Arsenic is mainly As (V) under the oxidation condition, while As (III) is mainly used in a groundwater system with a strong reduction condition, and in order to effectively remove As in wastewater, most methods currently pre-oxidize As (III) into As (V) and remove arsenic by coagulating sedimentation. At present, a large amount of chemical agents are required to be added into a lime precipitation method, an iron salt precipitation method and an iron salt-lime coprecipitation method which are commonly used at present, and the chemical agents are precipitated in the form of precipitates, so that a large amount of waste residues are generated, and the problem of secondary pollution exists, for example, in a method for treating low-concentration arsenic-containing wastewater in Chinese patent CN 102234160B, pH neutralization and adjustment, gypsum precipitation and separation, arsenic preoxidation of the wastewater, arsenic residue air flotation separation, clear liquid membrane filtration and the like are adopted, so that the treatment process is simple, the method is suitable for automatic treatment and can be widely applied to various industrial arsenic-containing wastewater, but the added chemical agents are various in types, the added chemical agents are large in dosage, and the treatment cost is higher; chinese patent (CN 103964601B) removes arsenic in wastewater by using scorodite crystal (FeAsO 4.2H2O) at high temperature, has simple process, can obtain stable arsenic-containing solid waste, reduces secondary pollution to the environment, but needs to react at 70-95 ℃, has large energy consumption and long reaction time, and is not economical; chinese patent (CN 103408162B) adopts two-stage 'chelation-flocculation-pH adjustment-filtration' for treatment, the treatment efficiency is high, the arsenic concentration of effluent is lower than 0.5ppm required by national emission standard, but the treatment process is long and the operation is complicated.
Disclosure of Invention
The application mainly aims to provide a method for treating arsenic-containing wastewater, and aims to solve the technical problems of long treatment process and poor economy in the prior art.
In order to achieve the above object, the present application provides a method for treating arsenic-containing wastewater, comprising the steps of:
adding aluminum phosphide treatment residues and composite ferric salt into arsenic-containing wastewater, stirring uniformly to enable the reaction to be complete, adding lime to adjust the pH value of the wastewater to 8-9, stirring uniformly to enable the reaction to be complete, and adding a flocculating agent to perform flocculation precipitation.
Preferably, the addition amount of the aluminum phosphide treatment residue is 8-12% of the mass of the arsenic-containing wastewater.
Preferably, the aluminum phosphide treatment residue is harmlessly treated aluminum phosphide residue containing aluminum hydroxide.
Preferably, the aluminum hydroxide content in the aluminum phosphide residue is 50% or more.
Preferably, the addition amount of the composite iron salt is 2-4% of the mass of the arsenic-containing wastewater.
Preferably, the composite iron salt is an inorganic polymeric flocculant, and the composite iron salt is hydrolyzed to generate high-valence polynuclear complex ions.
Preferably, the high-valent polynuclear complex ion comprises [ Fe [ ]2(OH)4]2+、[Fe3(OH)6]3+、 [Fe8(OH)20]4+。
Preferably, the flocculant is polyacrylamide.
Preferably, the polyacrylamide is a 0.1% polyacrylamide solution.
Preferably, the addition amount of the polyacrylamide solution is 1-2% of the mass of the arsenic-containing wastewater.
The invention has the beneficial effects that:
(1) the method is simple, easy to operate and thorough in treatment.
(2) No oxidation is needed, and the mud yield is low.
(3) The operation is stable, the operation is safe and quick, the cost is low, the purpose of treating waste by waste is achieved, and the economic benefit is good.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The application provides a method for treating arsenic-containing wastewater, which comprises the following steps:
adding aluminum phosphide treatment residues and composite ferric salt into arsenic-containing wastewater, stirring uniformly to enable the reaction to be complete, adding lime to adjust the pH value of the wastewater to 8-9, stirring uniformly to enable the reaction to be complete, and adding a flocculating agent to perform flocculation precipitation.
Specifically, weighing a certain mass of arsenic-containing wastewater, and adding aluminum phosphide treatment residue and composite iron salt into the arsenic-containing wastewater, wherein the aluminum phosphide treatment residue contains a large amount of AL (OH)3The method comprises the steps of reacting with arsenic (III) and arsenic (V) to generate a highly insoluble complex, hydrolyzing a composite iron salt to generate high-valence polynuclear complex ions, flocculating, settling and adsorbing the arsenic (III) and the arsenic (V), carrying out precipitation reaction on a small amount of generated iron ions and arsenic-containing ion groups, stirring for 30min to enable the arsenic (III) and the arsenic (V) in wastewater to fully react with aluminum phosphide treatment residues and the composite iron salt, adding lime to strictly control the pH value of the wastewater within the range of 8-9, stirring for 30min, adding a flocculating agent to carry out flocculation and precipitation, standing and precipitating, carrying out filter pressing, and sending treated effluent heavy metal indexes to reach standards to a solidification treatment workshop.
Preferably, the addition amount of the aluminum phosphide treatment residue is 8-12% of the mass of the arsenic-containing wastewater.
Preferably, the aluminum phosphide treatment residue is harmlessly treated aluminum phosphide residue, specifically, the aluminum phosphide residue is placed in a harmlessness treatment device, and after phosphine is released by adding an oxidant or acid or quick lime, the aluminum phosphide treatment residue is obtained, wherein the aluminum phosphide treatment residue comprises aluminum hydroxide or aluminum sulfate and calcium hydroxide, and preferably, the content of aluminum hydroxide in the aluminum phosphide residue is greater than or equal to 50%.
Preferably, the addition amount of the composite iron salt is 2-4% of the mass of the arsenic-containing wastewater.
Preferably, the composite iron salt is an inorganic polymeric flocculant, and the composite iron salt is hydrolyzed to generate high-valence polynuclear complex ions.
Preferably, the high-valent polynuclear complex ion comprises [ Fe [ ]2(OH)4]2+、[Fe3(OH)6]3+、 [Fe8(OH)20]4+。
Preferably, the flocculant is polyacrylamide.
Preferably, the polyacrylamide is a 0.1% polyacrylamide solution.
Preferably, the addition amount of the polyacrylamide solution is 1-2% of the mass of the arsenic-containing wastewater.
The aluminum phosphide is a high-efficiency pesticide raw material which is widely used at present, the phosphine released by hydrolysis has strong insecticidal action and little residue, therefore, the aluminum phosphide pesticide is widely used for the insecticidal treatment of grains, tobacco leaves, foods, containers and other articles, a great amount of aluminum phosphide pesticides are used in China at present, and then a great amount of aluminum phosphide residues are generated and need to be treated, aluminium hydroxide is generated in the hydrolysis process of aluminium phosphide, can react with arsenic (III) and arsenic (V) to generate a highly insoluble complex, and then realizing waste cooperative treatment, having high environmental protection value and economic benefit, improving the wastewater treatment effect by cooperatively compounding the ferric salt and the polyacrylamide, ensuring that the treated wastewater can reach the integrated wastewater discharge standard (GB8978-1996), and the sludge generated after treatment can reach the hazardous waste landfill pollution control standard (GB 18598-2019).
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
In addition, the experimental methods used in the examples described below are all conventional methods unless otherwise specified, the materials and reagents used therein are commercially available unless otherwise specified, and the equipment used in the experiments are well known to those skilled in the art without otherwise specified.
Example 1
Taking arsenic-containing wastewater of a certain company as a research object, and detecting the result as the original sample: pH 6.58, As 140 mg/L.
Weighing 100g of arsenic-containing wastewater in a beaker, adding 8g of aluminum phosphide treatment residue into the arsenic-containing wastewater, adding 2g of composite iron salt, stirring for 30min, then adding 3-5g of lime, fully stirring to adjust the pH value to 8-9, stirring for 20min, and adding 1g of prepared 0.1% polyacrylamide solution for flocculation precipitation. Standing for 12h, sampling and detecting, pumping into a filter press for filter pressing after the detection is qualified, allowing the wastewater to enter a sewage workshop, and conveying the sludge to a solidification workshop for disposal.
And (3) detection results: pH 9.83, As 52.5 ug/L.
Example 2
Weighing 50kg of arsenic-containing wastewater into a 100L plastic barrel, adding 5kg of aluminum phosphide treatment residue into the arsenic-containing wastewater, adding 1.5kg of composite iron salt, stirring for 20min, then adding 1.5-2.5kg of lime, fully stirring to adjust the pH value to 8-9, stirring for 30min, and adding 0.75kg of prepared 0.1% PAM for flocculation and precipitation. Standing for 12h, sampling and detecting, pumping into a filter press for filter pressing after the detection is qualified, allowing the wastewater to enter a sewage workshop, and conveying the sludge to a solidification workshop for disposal.
And (3) detection results: pH 10.12, As 32.5 ug/L.
Example 3
Weighing 1t of arsenic-containing wastewater into a 1.5t cubic barrel, adding 120kg of aluminum phosphide treatment residues into the arsenic-containing wastewater, adding 40kg of composite iron salt, stirring for 40min, then adding 30-50kg of lime, fully stirring to adjust the pH value to 8-9, stirring for 40min, and adding prepared 0.1% PAM20kg for flocculation and precipitation. Standing for 12h, sampling and detecting, pumping into a filter press for filter pressing after the detection is qualified, allowing the wastewater to enter a sewage workshop, and conveying the sludge to a solidification workshop for disposal.
And (3) detection results: pH 10.36, As 29.8 ug/L.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present application.
Claims (10)
1. The method for treating the arsenic-containing wastewater is characterized by comprising the following steps of:
adding aluminum phosphide treatment residues and composite ferric salt into arsenic-containing wastewater, stirring uniformly to enable the reaction to be complete, adding lime to adjust the pH value of the wastewater to 8-9, stirring uniformly to enable the reaction to be complete, and adding a flocculating agent to perform flocculation precipitation.
2. The method for treating arsenic-containing wastewater as claimed in claim 1, wherein the amount of the aluminum phosphide treatment residue added is 8 to 12% by mass of the arsenic-containing wastewater.
3. The method according to claim 1, wherein the aluminum phosphide treatment residue is a harmlessly treated aluminum phosphide residue containing aluminum hydroxide.
4. The method of claim 3, wherein the aluminum phosphide residue contains aluminum hydroxide in an amount of 50% or more.
5. The method for treating arsenic-containing wastewater as claimed in claim 1, wherein the amount of the composite iron salt added is 2-4% of the mass of the arsenic-containing wastewater.
6. The method for treating arsenic-containing wastewater according to claim 1, wherein the composite iron salt is an inorganic polymeric flocculant, and the composite iron salt is hydrolyzed to generate high-valence polynuclear complex ions.
7. The method of claim 6, wherein the high-valence polynuclear complex ion comprises [ Fe ]2(OH)4]2+、[Fe3(OH)6]3+、[Fe8(OH)20]4+。
8. The method of claim 1, wherein the flocculant is polyacrylamide.
9. The method of claim 8, wherein the polyacrylamide is a 0.1% polyacrylamide solution.
10. The method for treating arsenic-containing wastewater as claimed in claim 9, wherein the amount of the polyacrylamide solution added is 1-2% by mass of the arsenic-containing wastewater.
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| CN202111420935.1A CN114262085A (en) | 2021-11-26 | 2021-11-26 | Method for treating arsenic-containing wastewater |
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| CN202111420935.1A CN114262085A (en) | 2021-11-26 | 2021-11-26 | Method for treating arsenic-containing wastewater |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0780475A (en) * | 1993-09-17 | 1995-03-28 | Kotobuki Kakoki Kk | Arsenic removing treatment of arsenic-containing water |
| CN101601989A (en) * | 2009-06-29 | 2009-12-16 | 云南大学 | The method of a kind of liquid absorbent and improvement water body in lake arsenic contamination |
| CN104085867A (en) * | 2014-07-18 | 2014-10-08 | 中国人民解放军防化学院 | Method and device for treating residues of aluminum phosphide tablet fumigation agent |
| CN105948324A (en) * | 2016-06-23 | 2016-09-21 | 陈朝民 | Method for removing arsenic in sewage |
| CN107398463A (en) * | 2016-05-19 | 2017-11-28 | 上海烟草集团有限责任公司 | A kind of phosphatization residue of aluminum method for innocent treatment and processing device system |
-
2021
- 2021-11-26 CN CN202111420935.1A patent/CN114262085A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0780475A (en) * | 1993-09-17 | 1995-03-28 | Kotobuki Kakoki Kk | Arsenic removing treatment of arsenic-containing water |
| CN101601989A (en) * | 2009-06-29 | 2009-12-16 | 云南大学 | The method of a kind of liquid absorbent and improvement water body in lake arsenic contamination |
| CN104085867A (en) * | 2014-07-18 | 2014-10-08 | 中国人民解放军防化学院 | Method and device for treating residues of aluminum phosphide tablet fumigation agent |
| CN107398463A (en) * | 2016-05-19 | 2017-11-28 | 上海烟草集团有限责任公司 | A kind of phosphatization residue of aluminum method for innocent treatment and processing device system |
| CN105948324A (en) * | 2016-06-23 | 2016-09-21 | 陈朝民 | Method for removing arsenic in sewage |
Non-Patent Citations (1)
| Title |
|---|
| 黄涛等: "《锅炉压力容器十大技术标准规范》", 31 May 2005, 北京科大电子出版社 * |
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