CN110885144A - Method for removing pollutants in water by enhanced air flotation - Google Patents
Method for removing pollutants in water by enhanced air flotation Download PDFInfo
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- CN110885144A CN110885144A CN201811057195.8A CN201811057195A CN110885144A CN 110885144 A CN110885144 A CN 110885144A CN 201811057195 A CN201811057195 A CN 201811057195A CN 110885144 A CN110885144 A CN 110885144A
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- 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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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to the field of water pollutant treatment, and particularly discloses a method for removing pollutants in water by enhanced air flotation. The method can effectively strengthen the existing air floatation treatment by controlling the specific types of the reagents added into the water body to be treated, solves the technical problems of low degradation speed, low removal rate and difficult standard reaching of organic pollutants in the raw water treatment of a water supply plant, and is a method capable of rapidly degrading the organic pollutants.
Description
Technical Field
The invention belongs to the field of treatment of pollutants in water, and particularly relates to a method for removing pollutants in water by enhanced air flotation.
Background
Along with the development of economic society, the environmental pollution problem is increasingly serious, the problem of water environment pollution is not a little in China as a country in high-speed development, and the persistent refractory organic pollution on surface rivers, lakes, underground water bodies and soil is the most serious. At present, the water pollution removal method comprises a physical adsorption method, a chemical reduction method, a biodegradation method, an advanced oxidation method and the like. The advanced oxidation method is widely applied to the degradation of organic matters because the generated free radicals have higher oxidation-reduction potential. The existing advanced oxidation technology is mostly applied to the aspect of sewage treatment and is rarely applied to the aspect of urban water supply, mainly because new construction is needed and the investment and operation cost is high. However, the problems of overproof organic pollutants in surface water sources, difficult removal of pollutants, low removal rate and the like caused by the development of industry and improper wastewater treatment are important problems facing many water supply plants.
The air floatation process is a process of forming highly dispersed micro bubbles in water, adhering solid or liquid particles of hydrophobic groups in wastewater to form a water-gas-particle three-phase mixed system, forming flocs with apparent density smaller than that of water after the particles adhere to the bubbles, floating to the water surface, forming a scum layer and scraping, thereby realizing solid-liquid or liquid-liquid separation. The method has the advantages of effectively removing oil pollutants, algae, particles and the like in water, and is widely applied to water treatment in China. However, the problems of overproof micro-pollutant content in water, great harm, difficult treatment and the like can be solved by a non-coagulation-air flotation-precipitation-disinfection process, and the improvement process is in urgent need of development.
The intensified air floatation process is an improved process developed on the basis of advanced oxidation technology, and the intensified air floatation process in the prior art is characterized by utilizing a micro-bubble modification technology to intensify air floatation, and comprising a permanganate adding pretreatment technology, a throwing floating aid and the like. The micro bubbles and the floating assistant agent aim at strengthening the removal rate of the air flotation tank; the permanganate method uses its strong oxidizing property to oxidize small molecular organic substances in water. The invention opens up a new reinforced air floating process, which uses iron or ferrous ion to activate sulfite to generate sulfate radical free radical to oxidize and degrade organic pollutant, and has the advantages of high degradation rate, good removal effect and no generation of toxic and harmful substances. In addition, the enhanced air flotation process does not need to add an additional water treatment structure, only needs to add iron salt and sulfite in the coagulation and air flotation processes, and is simple and safe to operate.
Disclosure of Invention
In view of the above defects or improvement needs of the prior art, the present invention provides a method for removing pollutants in water by enhanced air flotation, wherein the existing air flotation treatment can be effectively enhanced by controlling the specific type of reagent added to the water body to be treated, and the technical problems of low degradation speed, low removal rate and difficult standard reaching of organic pollutants in raw water treatment of a water supply plant are solved. In addition, the invention also optimally controls the adding time and the adding amount of the reagent, so that the method can realize the rapid removal of the organic pollutants, and is a method capable of rapidly degrading the organic pollutants.
In order to achieve the purpose, the invention provides a method for removing pollutants in water by enhanced air flotation, which is characterized in that iron ions or ferrous ions are added into water to be treated, sulfite is added, and the water to be treated is treated by an air flotation process, so that organic pollutants in the water are removed by enhanced air flotation.
As a further preferred aspect of the present invention, ferric ions or ferrous ions are added to the water body to be treated, specifically, a flocculant containing ferric ions or ferrous ions is added to the water body to be treated in a coagulation stage, or ferric ions or ferrous ions are additionally added while the flocculant is added to the water body to be treated in the coagulation stage, so that the concentration of the ferric ions or the ferrous ions in the water body to be treated satisfies 5-50 mg/L.
As a further preferred aspect of the present invention, the sulfite is added, specifically, the sulfite is added into the water body to be treated in a coagulation stage or an air flotation stage, and the concentration of the added sulfite in the water body to be treated satisfies 5-250 mg/L.
As a further preferred aspect of the invention, a flocculating agent containing ferric ions or ferrous ions is added into the water body to be treated in the coagulation stage, and after the sulfite is added, the pH value of the water body to be treated is adjusted to 3-10;
or, adding iron ions or ferrous ions while adding the flocculating agent into the water body to be treated in the coagulation stage, and adjusting the pH value of the water body to be treated to 3-10 after adding the sulfite.
As a further preferable aspect of the present invention, the concentration of the added iron ions or ferrous ions in the water to be treated satisfies 25mg/L, and the concentration of the added sulfite in the water to be treated satisfies 80 mg/L.
In a further preferred embodiment of the present invention, the flocculant is at least one of aluminum sulfate, aluminum chloride, iron sulfate, iron chloride, polyaluminum chloride (PAC), polyaluminum sulfate (PAS), Polyaluminum Ferric Chloride (PFC), and Polyaluminum Ferric Sulfate (PFS), polyaluminum ferric sulfate, and Polyacrylamide (PAM).
As a further preferred aspect of the present invention, the iron ions are specifically added in the form of an iron compound, and the iron compound is preferably at least one of ferric sulfate, ferric chloride and ferroferric oxide.
As a further preferred aspect of the present invention, the ferrous ion is specifically added in the form of a ferrous compound, and the ferrous compound is preferably at least one of ferrous sulfate, ferrous chloride and ferrous oxide.
As a further preferred aspect of the present invention, the sulfite is at least one of sodium sulfite, potassium sulfite, sodium bisulfite and potassium bisulfite.
Compared with the prior art, the technical scheme of the invention has the advantages that iron ions (or ferrous ions, and both the iron ions and the ferrous ions can be added simultaneously) and sulfite are added into the water body to be treated, wherein the iron ions or the ferrous ions are added into the water in the coagulation stage, and the sulfite is added into the water in the coagulation stage or the air flotation stage, so that organic pollutants in the water can be removed, and pollutants in the water can be removed in an enhanced manner, and the specific principle is as follows:
(1) iron or ferrous ion as transition metal element can activate sulfite to generate sulfite radical, and sulfite radical can be further oxidized into sulfate radical SO in aerobic environment4 ·-. It has a high oxidation-reduction potential (E)02.65-3.1V) and has strong selectivity, and degrades organic matters by abstracting outermost electrons.
(2) The air floatation process can ensure sufficient oxygen concentration and provide guarantee for activating sulfite by iron or ferrous ions to generate active free radicals.
(3) Iron and iron ions are used as one of the coagulants, and can be added in the coagulation stage, so that the treatment process is not influenced.
Advanced oxidation techniques are various and the present invention uses sulfite and transition metal iron advanced oxidation techniques. Compared with the permanganate method and the like in the prior art, the enhanced air flotation process has the advantages of strong oxidizability, quick action effect and wide application range of organic matters.
The invention effectively overcomes the problems of low organic matter removal efficiency and high cost of the feedwater treatment process. The method for removing organic matters in the water supply treatment engineering comprises the following steps: coagulation treatment, adsorption treatment, oxidation treatment, membrane treatment and ion exchange treatment. Among the treatment technologies, the adsorption and membrane treatment technologies have good removal effect but high cost and poor economic benefit; the removal rate of the coagulation technology is low; the oxidation treatment is often difficult and costly to achieve with the desired effect due to the different oxidizing power of the oxidizing agent. The invention is based on the oxidation treatment technology, adopts the sulfate radical advanced oxidation technology, can overcome the difficult problem of non-ideal oxidation treatment effect, and has lower cost compared with PS/PMS and other medicaments.
The invention also preferably controls the addition amount of the iron ions or the ferrous ions to enable the addition amount to meet 0-50 mg/L (more preferably 25mg/L), and preferably controls the addition amount of the sulfite to enable the addition amount to meet 5-250 mg/L (more preferably 80mg/L), so that oxygen and sulfite radicals generated after the sulfite is activated by the iron ions or the ferrous ions can continuously react with each other to generate active sulfate radicals in 10-30 min of air aeration treatment or oxygen daily aeration treatment, thereby achieving the purpose of oxidizing organic pollutants, realizing the removal of organic matters in the water body, and having high degradation speed and good removal rate of the organic matters.
The method removes organic pollutants in water by using iron or ferrous ions and sulfite, is simple to operate, can use the existing air floatation treatment and subsequent water treatment equipment, is economical and applicable, and particularly has the following advantages:
1. the invention has fast removing speed to the pollutant, good degradation effect, no generation of additional toxic and harmful substances, safety and reliability.
2. The method is simple to operate, and the purpose of removing pollutants can be achieved only by adding a small amount of iron or ferrous ions and sulfite in the coagulation aeration stage.
3. The invention has high economic applicability, is easy to upgrade and reform a water plant, does not need to add water treatment structures, and does not need to additionally add aeration, ultraviolet irradiation and disinfection processes. The invention can effectively utilize the water treatment facilities of the existing water supply plant, and can lead the water treated by ferric ions (or ferrous ions) and sulfite into the existing subsequent water treatment structure for subsequent treatment.
Drawings
FIG. 1 is a graph showing the effect of treating tetrabromobisphenol A with ferrous ions and sulfite in the present invention.
FIG. 2 is a comparison graph of the effect of removing bisphenol A in raw water by the intensified air-float method and the air-float method in one week in a water plant, wherein a legend ■ in FIG. 2 represents the bisphenol A concentration standard specified in the national drinking water standard, a legend ● represents the bisphenol A concentration in water treated by the conventional air-float process, and a legend ▲ represents the bisphenol A concentration in water treated by the intensified air-float process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment utilizes ferrous ions and sulfite to treat tetrabromobisphenol A in water, and comprises the following steps:
adding 50mg/L ferrous ions and 250mg/L sodium sulfite into water to be treated, then adjusting the pH value of the water to be treated containing tetrabromobisphenol A to 6 by using a sodium hydroxide solution and dilute sulfuric acid, and reacting for 30min by adopting a mode of air aeration and mechanical stirring. Of course, the aeration treatment may be oxygen aeration.
In the first step of this example, ferrous ions and sulfite are added as a solution.
The graph of the effect of removing tetrabromobisphenol A in water treated with ferrous ions and sulfite in this example is shown in FIG. 1. From fig. 1, it can be seen that the ferrous iron/sulfite system has a high degradation speed and a good removal rate for organic substances in the presence of oxygen.
Example 2
Compared with the conventional water supply plant air flotation process, the method for treating the raw water of the water supply plant containing the bisphenol A (with the concentration of 0.019mg/L) by utilizing the enhanced air flotation process of the iron or ferrous ions and the sulfite comprises the following steps:
firstly, adding 25mg/L (calculated by iron) of flocculating agent polymeric aluminum ferric sulfate into water in a coagulation stage.
And (II) adding 22mg/L of sulfite into the water in a coagulation stage or an air floatation stage.
And (III) introducing the treated water into a subsequent water treatment structure for subsequent treatment, namely finishing the operation of removing the organic pollutants in the water by using iron ions or ferrous ions and sulfite.
Fig. 2 is a graph showing the removal effect of the conventional air flotation process and the enhanced air flotation process on raw water containing bisphenol a in this example. The national drinking water standard requires that the content of bisphenol A in water is not higher than 0.01 mg/L. As can be seen from FIG. 2, the number of days in which the concentration of bisphenol A in the raw water treated by the conventional air flotation process does not reach the standard is four days in a week, so that the problem that the treatment effect is unstable when trace pollutants are treated by the conventional air flotation process can be solved. In the enhanced air flotation process, the treated water stably reaches the standard within one week and meets the national drinking water standard.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for removing pollutants in water by enhanced air flotation is characterized in that iron ions or ferrous ions are added into water to be treated, sulfite is added, and the water to be treated is treated by an air flotation process, so that organic pollutants in the water are removed by enhanced air flotation.
2. The method for removing pollutants in water by enhanced air flotation according to claim 1, wherein ferric ions or ferrous ions are added into the water body to be treated, specifically, a flocculating agent containing ferric ions or ferrous ions is added into the water body to be treated in a coagulation stage, or ferric ions or ferrous ions are additionally added while the flocculating agent is added into the water body to be treated in the coagulation stage, so that the concentration of the ferric ions or the ferrous ions in the water body to be treated meets 5-50 mg/L.
3. The method for removing pollutants in water by enhanced air flotation as claimed in claim 1, wherein sulfite is added, specifically sulfite is added into the water body to be treated in a coagulation stage or an air flotation stage, and the concentration of the added sulfite in the water body to be treated meets 5-250 mg/L.
4. The method for removing pollutants in water by enhanced air flotation according to claim 2, wherein after the flocculating agent containing ferric ions or ferrous ions is added into the water body to be treated in the coagulation stage, and the sulfite is added, the pH value of the water body to be treated is adjusted to 3-10;
or, adding iron ions or ferrous ions while adding the flocculating agent into the water body to be treated in the coagulation stage, and adjusting the pH value of the water body to be treated to 3-10 after adding the sulfite.
5. The method for removing pollutants from water by enhanced air flotation as claimed in claim 1, wherein the concentration of the added iron ions or ferrous ions in the water body to be treated is 25mg/L, and the concentration of the added sulfite in the water body to be treated is 80 mg/L.
6. The method for enhanced air flotation of claim 2, wherein the flocculating agent is at least one of aluminum sulfate, aluminum chloride, ferric sulfate, ferric chloride, polyaluminum chloride (PAC), polyaluminum sulfate (PAS), polyferric chloride (PFC), and polyferric sulfate (PFS), polyaluminum ferric sulfate, and Polyacrylamide (PAM).
7. The method for removing pollutants from water by enhanced air flotation according to claim 1, wherein the iron ions are added in the form of an iron compound, and the iron compound is preferably at least one of ferric sulfate, ferric chloride and ferroferric oxide.
8. The method for removing pollutants from water by enhanced air flotation as claimed in claim 1, wherein the ferrous ions are added in the form of a ferrous compound, and the ferrous compound is preferably at least one of ferrous sulfate, ferrous chloride and ferrous oxide.
9. The method for enhanced air flotation of claim 1, wherein the sulfite is at least one of sodium sulfite, potassium sulfite, sodium bisulfite and potassium bisulfite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811057195.8A CN110885144A (en) | 2018-09-11 | 2018-09-11 | Method for removing pollutants in water by enhanced air flotation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113044951A (en) * | 2021-03-19 | 2021-06-29 | 西安交通大学 | Method for degrading antibiotics in water by plasma in cooperation with sulfite and ferric salt |
| CN114716000A (en) * | 2022-03-16 | 2022-07-08 | 华东理工大学 | Method for removing organic pollutants in water body by using iron activated calcium sulfite |
| CN115368904A (en) * | 2021-05-18 | 2022-11-22 | 中国石油化工股份有限公司 | Composition with function of degrading organic pollutants and application thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113044951A (en) * | 2021-03-19 | 2021-06-29 | 西安交通大学 | Method for degrading antibiotics in water by plasma in cooperation with sulfite and ferric salt |
| CN115368904A (en) * | 2021-05-18 | 2022-11-22 | 中国石油化工股份有限公司 | Composition with function of degrading organic pollutants and application thereof |
| CN114716000A (en) * | 2022-03-16 | 2022-07-08 | 华东理工大学 | Method for removing organic pollutants in water body by using iron activated calcium sulfite |
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