CN111377561A - Treatment method of wastewater containing high-concentration COD and sulfide - Google Patents
Treatment method of wastewater containing high-concentration COD and sulfide Download PDFInfo
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- CN111377561A CN111377561A CN202010245768.0A CN202010245768A CN111377561A CN 111377561 A CN111377561 A CN 111377561A CN 202010245768 A CN202010245768 A CN 202010245768A CN 111377561 A CN111377561 A CN 111377561A
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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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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic 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
- C02F2101/10—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
- C02F7/00—Aeration of stretches of water
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Abstract
The invention discloses a method for treating wastewater containing high-concentration COD and sulfides, which comprises the following steps: adjusting the pH value of the wastewater to 6-7, adding the cured light-burned magnesium oxide slurry into the wastewater, uniformly mixing, adding solid ferric hydroxide into the wastewater, uniformly mixing again, carrying out aeration stirring on the wastewater, removing foams on the surface of the wastewater after foams appear on the surface layer of the wastewater in the aeration stirring process, and carrying out aeration stirring for 4-6 hours. According to the method for treating the wastewater containing high-concentration COD and sulfides, the concentration of sulfides and the concentration of COD in the wastewater can be greatly reduced by adjusting the pH of the wastewater and adding the aged light-burned magnesium oxide slurry to be combined with the ferric hydroxide, the removal rate of the sulfides in the wastewater can reach 99.26% to the maximum, and the removal rate of the COD in the wastewater can reach 81.66% to the maximum.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment and comprehensive utilization, and particularly relates to a treatment method of wastewater containing high-concentration COD (chemical oxygen demand) and sulfides.
Background
With the acceleration of urbanization and industrialization in China, the industrial water consumption in China tends to increase year by year. The wastewater produced by various productions is not up to the standard and is directly discharged to the water body, so that the problem of water pollution is increasingly serious. Chemical Oxygen Demand (COD) is an important index for evaluating the pollution degree of wastewater to water bodyHigh-concentration sulfides can also bring harm to water, and industrial wastewater often contains a large amount of COD (3000-10000 mg/L)) and sulfide ions (S)2-) (about 15000 mg/L). Domestic sewage and industrial wastewater often contain a large amount of COD and ammonia nitrogen. High concentration COD can cause the water to become anaerobic state to blacken, foul, not only influence quality of water, still can influence the surrounding environment, can influence the health status of the crowd who lives in this kind of environment even, also can damage some specific tissue organ and nervous system function. The high-concentration sulfide in the wastewater is easy to form hydrogen sulfide, and the hydrogen sulfide is dissipated into the air from water to generate foul smell to seriously pollute the atmosphere, is a strong nerve toxic gas with the toxicity equivalent to that of cyanic acid, and can cause different degrees of influence on a respiratory system, a circulatory system, a digestive system and a nervous system after being inhaled into a human body. Hydrogen sulfide also has an effect on animals and plants in water, and its severe toxicity affects the growth and reproduction of organisms. When the concentration of sulfide in sewage is too high, the cell structure of microorganisms in the sewage is easily damaged, enzymes in bacteria are deteriorated, the activity is inhibited, sludge bulking is caused, and the subsequent treatment of the sewage is also influenced. Therefore, domestic sewage and industrial wastewater can be discharged after being pretreated to reach the standard before being discharged.
The current common methods for treating high COD and sulfide wastewater include a direct stripping method, a Fenton method, an adsorption method, a biological method, a steam stripping method and the like. Among them, the blow-off method is the earliest method, but the hydrogen sulfide is often seriously polluted after being blown off, and the blow-off method is not ideal in the effect of removing COD. The Fenton method can remove COD while removing sulfide, but the process is complex, a large amount of strong oxidant needs to be added, and the cost is high. Adsorption processes often require the use of activated carbon or other polymeric adsorbents, resulting in higher costs. Although the biological method has good treatment effect, COD cannot be removed, the cost is high, the technology is not mature, and the required treatment time is long. The steam stripping method has good effect on removing sulfide, is simple to operate, but usually needs to consume a large amount of energy, and has slightly higher cost.
Therefore, the treatment method with lower cost and higher removal rate is provided for removing the sulfides and COD in the wastewater, and has important significance for ensuring the cleanness of regional water systems and the health of people.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a method for treating wastewater containing high-concentration COD and sulfides, which has lower cost for removing the sulfides and the COD in the wastewater under the effect of ensuring the removal rate.
In order to achieve the technical purpose, the technical scheme of the invention provides a method for treating wastewater containing high-concentration COD and sulfide, which comprises the following steps: adjusting the pH value of the wastewater to 6-7, adding the cured light-burned magnesium oxide slurry into the wastewater, uniformly mixing, adding solid ferric hydroxide into the wastewater, uniformly mixing again, carrying out aeration stirring on the wastewater, removing foams on the surface of the wastewater after foams appear on the surface layer of the wastewater in the aeration stirring process, and carrying out aeration stirring for 4-6 hours.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a method for treating wastewater containing high-concentration COD (chemical oxygen demand) and sulfides, which comprises the steps of firstly adjusting the pH of the wastewater to 6-7, then enabling partial sulfide ions in the wastewater to overflow in the form of hydrogen sulfide gas and be adsorbed by aged light-burned magnesium oxide slurry to form Mg (OH)2·(H2S) x solid solution, and further decomposing the x solid solution into magnesium hydrosulfide, removing the magnesium hydrosulfide by generating magnesium sulfate after aeration, stirring and oxidation, and simultaneously, the added ferric hydroxide plays a role in catalysis and can accelerate the reaction process of sulfide oxidation;
2. according to the method for treating the wastewater containing high-concentration COD and sulfide, the aged light-burned magnesium oxide slurry has an adsorption effect, can effectively adsorb COD and suspended matters in the wastewater, can float upwards with the COD under the action of aeration stirring, and is removed in the process of removing foam, so that the concentration of the COD in the wastewater is effectively reduced;
3. according to the method for treating the wastewater containing high-concentration COD and sulfides, the concentration of sulfides and the concentration of COD in the wastewater can be greatly reduced by adjusting the pH of the wastewater and adding the cured light-burned magnesium oxide slurry to be combined with the ferric hydroxide, the removal rate of the sulfides in the wastewater can reach 99.26% to the maximum, and the removal rate of the COD in the wastewater can reach 81.66% to the maximum; compared with the prior common method, the treatment method provided by the invention greatly reduces the treatment cost, has the advantages of simple operation and maintenance, convenient operation, no secondary pollution and the like, can be used for printing and dyeing wastewater and other wastewater containing ultrahigh-concentration sulfide and COD, has the characteristics of wide application range, good treatment effect, economy, effectiveness and the like, and has great popularization and application values.
Drawings
FIG. 1 is a process flow diagram of the treatment process of the present invention;
fig. 2 is a structural view of an impeller air-floating machine used in the present invention.
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.
The invention provides a method for treating wastewater containing high-concentration COD and sulfides, which comprises the following steps:
adjusting the pH value of the wastewater to 6-7, adding the cured light-burned magnesium oxide slurry into the wastewater, uniformly mixing, adding solid ferric hydroxide into the wastewater, uniformly mixing again, carrying out aeration stirring on the wastewater, removing foams on the surface of the wastewater after foams appear on the surface layer of the wastewater in the aeration stirring process, and carrying out aeration stirring for 4-6 hours.
In some preferred embodiments of the present invention, the COD concentration of the wastewater to be treated is 3000-10000 mg/L, the concentration of the sulfide ions is less than 15000mg/L, and the pH of the wastewater to be treated is greater than 8.
In some preferred embodiments of the present invention, the aged light-burned magnesium oxide is prepared by the following method: mixing solid magnesium oxide with water, heating to 70-90 ℃, curing for 2-3 h to obtain light-burned magnesium oxide slurry, wherein the amount of the added water is enough to enable the solid magnesium oxide to form the slurry.
In some preferred embodiments of the invention, the mass ratio of the addition amount of the aged light-burned magnesium oxide slurry to sulfur ions in the wastewater is 0.8-1.5: 1.
in some preferred embodiments of the present invention, the mass ratio of the solid ferric hydroxide to the sulfur ions in the wastewater is 0.05-0.1: 1.
in some preferred embodiments of the present invention, sulfuric acid or hydrochloric acid is added during the aeration stirring process of the wastewater to maintain the pH of the wastewater at 6-7.
In the invention, the aeration stirring equipment is used for carrying out aeration stirring on the wastewater, and the aeration stirring equipment is provided with a foam scraping plate for scraping the foam on the surface layer of the wastewater. The person skilled in the art can select suitable aeration stirring device according to actual needs, such as: the impeller air-float machine shown in fig. 2 can be selected, the aeration stirring device includes but is not limited to the impeller air-float machine, and the aeration stirring device is not further limited in the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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.
The experimental methods in the present invention are conventional methods unless otherwise specified. The experimental materials used in the present invention were all purchased from the market unless otherwise specified.
Example 1:
the embodiment 1 of the invention provides a method for treating wastewater containing high-concentration COD and sulfide, which comprises the following steps:
the method comprises the steps of taking 5L of a waste water sample, adding hydrochloric acid into the waste water sample to adjust the pH of the waste water sample to 6, putting the waste water into an impeller air flotation machine, taking 4.8g of solid MgO, adding appropriate amount of water, uniformly mixing solid magnesium oxide and water, heating to 70 ℃, curing for 3 hours to obtain light-burned magnesium oxide slurry, adding the light-burned magnesium oxide slurry into the waste water, fully stirring and uniformly mixing, adding 0.8g of ferric hydroxide into the waste water, uniformly mixing again, starting the impeller air flotation machine, opening an aerating device and a scraper switch, carrying out aeration stirring on the waste water at normal temperature, removing foams on the surface of the waste water after foams appear on the surface of the waste water in the aeration stirring process, and carrying out aeration stirring for 5 hours.
Example 2:
the embodiment 2 of the invention provides a method for treating wastewater containing high-concentration COD and sulfide, which comprises the following steps:
taking 5L of a waste water sample, adding hydrochloric acid into the waste water sample to adjust the pH of the waste water sample to 6, putting the waste water into an impeller air flotation machine, taking 4.8g of solid MgO, adding appropriate water, uniformly mixing solid magnesium oxide and water, heating to 75 ℃, curing for 2.5 hours to obtain light-burned magnesium oxide slurry, adding the light-burned magnesium oxide slurry into the waste water, fully stirring and uniformly mixing, adding 0.8g of ferric hydroxide into the waste water, uniformly mixing again, starting the impeller air flotation machine, opening an aerating device and a scraper switch, carrying out aeration stirring on the waste water at normal temperature, adding hydrochloric acid into the waste water during aeration stirring to maintain the pH of the waste water at 6-7, removing foams on the surface of the waste water after foams appear on the surface layer of the waste water during aeration stirring, aerating and stirring for 5 hours.
Example 3:
embodiment 3 of the present invention provides a method for treating wastewater containing high concentration COD and sulfide, comprising the steps of:
taking 5L of a wastewater sample, adding hydrochloric acid into the wastewater sample to adjust the pH of the wastewater sample to 6, putting the wastewater into an impeller air flotation machine, taking 2.5g of solid MgO, adding appropriate water, uniformly mixing solid magnesium oxide and water, heating to 80 ℃, curing for 2.5h to obtain light-burned magnesium oxide slurry, adding the light-burned magnesium oxide slurry into the wastewater, fully stirring and uniformly mixing, adding 0.5g of ferric hydroxide into the wastewater, uniformly mixing again, starting the impeller air flotation machine, opening an aerating device and a scraper switch, carrying out aeration stirring on the wastewater at normal temperature, adding hydrochloric acid into the wastewater during aeration stirring to maintain the pH of the wastewater at 6-7, removing foams on the surface of the wastewater after foams appear on the surface layer of the wastewater during aeration stirring, aerating and stirring for 5 hours.
Example 4:
embodiment 4 of the present invention provides a method for treating wastewater containing high concentration COD and sulfide, comprising the steps of:
taking 5L of a wastewater sample, adding hydrochloric acid into the wastewater sample to adjust the pH of the wastewater sample to 6, putting the wastewater into an impeller air flotation machine, taking 1g of solid MgO, adding appropriate water, uniformly mixing solid magnesium oxide with water, heating to 90 ℃, curing for 2 hours to obtain light-burned magnesium oxide slurry, adding the light-burned magnesium oxide slurry into the wastewater, fully stirring and uniformly mixing, adding 0.5g of ferric hydroxide into the wastewater, uniformly mixing again, starting the impeller air flotation machine, opening an aerating device and a scraper switch, carrying out aeration stirring on the wastewater at normal temperature, adding hydrochloric acid into the wastewater in the aeration stirring process to maintain the pH of the wastewater at 6-7, removing foams on the surface of the wastewater after foams appear on the surface of the wastewater in the aeration stirring process, aerating and stirring for 5 hours.
The concentrations of the sulfide ions and COD in the wastewater treated by the treatment methods of examples 1 to 4 are greatly reduced, and the wastewater can directly enter a wastewater treatment plant for further biochemical treatment, wherein the concentrations of the sulfide ions and COD in the wastewater treated by the treatment methods of examples 1 to 4 are shown in Table 1.
TABLE 1
As can be seen from Table 1, the concentration of sulfide and COD in the wastewater treated by the treatment method of the invention is greatly reduced, the removal rate of sulfide in the wastewater can reach 99.26% at most, and the removal rate of COD in the wastewater can reach 81.66% at most.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A method for treating wastewater containing high-concentration COD and sulfide is characterized by comprising the following steps: adjusting the pH value of the wastewater to 6-7, adding the cured light-burned magnesium oxide slurry into the wastewater, uniformly mixing, adding solid ferric hydroxide into the wastewater, uniformly mixing again, carrying out aeration stirring on the wastewater, removing foams on the surface of the wastewater after foams appear on the surface layer of the wastewater in the aeration stirring process, and carrying out aeration stirring for 4-6 hours.
2. The method according to claim 1, wherein the COD concentration of the wastewater to be treated is 3000-10000 mg/L, the concentration of the sulfide ion is less than 15000mg/L, and the pH of the wastewater to be treated is greater than 8.
3. The method for treating wastewater containing high concentration of COD and sulfide according to claim 1, wherein said aged light burned magnesium oxide is prepared by the following method: and mixing the solid magnesium oxide with water, heating to 70-90 ℃, and curing for 2-3 hours to obtain light-burned magnesium oxide slurry.
4. The method for treating wastewater containing high-concentration COD and sulfide according to claim 1, wherein the mass ratio of the addition amount of the aged light-burned magnesium oxide slurry to sulfur ions in the wastewater is 0.8-1.5: 1.
5. the method for treating wastewater containing high-concentration COD and sulfide according to claim 1, wherein the mass ratio of the addition amount of the solid ferric hydroxide to the sulfur ions in the wastewater is 0.05-0.1: 1.
6. the method for treating wastewater containing high concentration COD and sulfide according to claim 1, wherein the pH of the wastewater is maintained at 6-7 by adding sulfuric acid or hydrochloric acid during the aeration stirring process of the wastewater.
7. The method for treating wastewater containing high concentration COD and sulfide according to claim 1, wherein the wastewater is aerated and stirred by an aeration stirring device, and the aeration stirring device is provided with a foam scraping plate for scraping the foam on the surface layer of the wastewater.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5228995A (en) * | 1992-04-23 | 1993-07-20 | Stover Enos L | Biochemically enhanced hybrid anaerobic reactor |
| JP2008239516A (en) * | 2007-03-26 | 2008-10-09 | Hiroto Maeda | Method for preventing red tide from developing |
| CN108793505A (en) * | 2018-07-11 | 2018-11-13 | 常州大学 | The method for handling floating cupric sulfide waste water and acidic organic wastewater simultaneously |
-
2020
- 2020-03-31 CN CN202010245768.0A patent/CN111377561A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5228995A (en) * | 1992-04-23 | 1993-07-20 | Stover Enos L | Biochemically enhanced hybrid anaerobic reactor |
| JP2008239516A (en) * | 2007-03-26 | 2008-10-09 | Hiroto Maeda | Method for preventing red tide from developing |
| CN108793505A (en) * | 2018-07-11 | 2018-11-13 | 常州大学 | The method for handling floating cupric sulfide waste water and acidic organic wastewater simultaneously |
Non-Patent Citations (5)
| Title |
|---|
| B.考兹奥罗夫斯基等: "《工业废水处理》", 31 December 1975, 中国建筑工业出版社 * |
| S.M.斯坦莱: "《化工反应动力学》", 28 March 1975, 燃料化学工业出版社 * |
| 郭如新: "用氢氧化镁脱除硫化氢改善水体质量", 《硫磷设计与粉体工程》 * |
| 陈永品: "《绿色增长 中国开发区的新使命》", 31 July 2012, 广东人民出版社 * |
| 黎松强等: "《水污染控制与资源化工程》", 28 February 2009, 武汉理工大学出版社 * |
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