CN107201329B - Achromobacter with hexavalent chromium removal and aerobic denitrification performance and application thereof - Google Patents
Achromobacter with hexavalent chromium removal and aerobic denitrification performance and application thereof Download PDFInfo
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Abstract
The invention relates to an Achromobacter sp with hexavalent chromium removal and aerobic denitrification performances and application thereof in sewage treatment. The colorless bacillus has the preservation number of CGMCC No 2964, not only has the capability of removing hexavalent chromium, but also has the denitrification capability under aerobic conditions. When the concentration of hexavalent chromium in the sewage is in the range of 4-8 mg/L, the strain can use nitrate nitrogen as a unique nitrogen source, the removal rate of the nitrate nitrogen can reach 100% under an aerobic environment, and the removal rate of the hexavalent chromium can reach more than 70%. The method has the advantages of convenience in operation, high denitrification efficiency and the like, and has important significance for optimizing the sewage biological treatment system and weakening the influence of hexavalent chromium on the sewage denitrification system.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a colorless bacillus capable of synchronously removing nitrate nitrogen and hexavalent chromium in a water body under an aerobic condition and application thereof in sewage treatment.
Background
With the acceleration of urbanization and industrialization in China and the continuous development of industrial production, a large amount of industrial wastewater is generated, and great threats are generated to human life and health. As the industrial wastewater treatment capacity of China cannot keep pace with the scale of industrial water, part of industrial wastewater is directly discharged into a town sewage pipe network without treatment. Hexavalent chromium is widely used in the electroplating, dye manufacturing, leather and metallurgical industries as an important industrial material, and a large amount of chromium-containing wastewater is produced in the industries, and the wastewater inevitably enters a municipal sewage treatment plant. Researches show that hexavalent chromium can affect the growth of most microorganisms and even cause massive death of the microorganisms, and urban sewage treatment plants do not usually have the capability of treating the hexavalent chromium, so that the normal operation of the urban sewage treatment system can be seriously affected by the entry of the hexavalent chromium.
Since hexavalent chromium is 100 times more toxic than trivalent chromium, a common method of treating hexavalent chromium contamination is to convert hexavalent chromium to trivalent chromium. Common methods for treating hexavalent chromium wastewater include adsorption, chemical reduction and sedimentation, electrochemical methods, ion exchange methods, photocatalytic methods, and the like. However, in recent years, the microbial treatment of chromium-containing wastewater has attracted more and more attention for its advantages of low investment, low operation cost, no secondary pollution and the like.
The aerobic denitrification is a novel biological denitrification technology provided in the last 80 th century, and the technology provides a theoretical basis for achieving denitrification in a single aerobic reactor based on the characteristic that aerobic denitrifying bacteria can simultaneously carry out oxygen and nitrate respiration. Since the first aerobic denitrifying bacteria T.pantotropia were successfully isolated, more efficient aerobic denitrifying bacteria were isolated in recent years and applied to practical sewage treatment systems. As a novel biological denitrification technology, aerobic denitrification is rapidly developed in recent years due to the advantages of simple process, good denitrification effect, no need of adding acid and alkali and the like.
Aiming at the problem that hexavalent chromium and nitrate nitrogen coexist when hexavalent chromium-containing wastewater enters domestic sewage, how to effectively remove the two pollutants simultaneously becomes the focus of attention of people. Therefore, the bacteria with hexavalent chromium removal capacity and aerobic denitrification performance are discovered and applied to sewage treatment, so that the potential risk of hexavalent chromium to the biological sewage denitrification process can be effectively reduced, and the method has important significance for guaranteeing the normal operation of the urban sewage treatment system.
Disclosure of Invention
The invention aims to provide Achromobacter sp (Achromobacter sp.) with hexavalent chromium removal and aerobic denitrification capabilities, which can be used for enhancing the biological denitrification effect of a sewage treatment system so as to reduce the influence of the presence of hexavalent chromium on the biological denitrification process of sewage treatment.
The strain provided by the invention is Achromobacter sp, which is an aerobic denitrifying bacterium capable of synchronously removing nitrate nitrogen and hexavalent chromium in a single aerobic environment.
The invention is realized by the following technical scheme:
the achromobacter (Achromobacter) with hexavalent chromium removal and aerobic denitrification capabilities provided by the invention has the preservation number of CGMCC No 2964.
Achromobacter sp as described above, characterized in that: the strain can perform aerobic denitrification by taking nitrate nitrogen as a nitrogen source and organic matters as a carbon source, and can reduce hexavalent chromium into trivalent chromium, so that the nitrate nitrogen and the hexavalent chromium are removed under aerobic conditions.
Use of the Achromobacter sp as defined above in the treatment of wastewater, characterized in that: achromobacter sp is added into the sewage containing nitrate nitrogen and hexavalent chromium, and a proper amount of carbon source is added for aeration, so that the removal of the nitrate nitrogen and the hexavalent chromium in the sewage can be realized.
The method described above, characterized in that: controlling the temperature of the sewage containing nitrate nitrogen and hexavalent chromium to be 30 ℃, the pH value to be 7.5, the dissolved oxygen to be 6mg/L, the initial C/N ratio to be 4,
the method described above, characterized in that: when the concentration of hexavalent chromium in the sewage is in the range of 0-4 mg/L, the strain can use nitrate nitrogen as a unique nitrogen source, the removal rate of the nitrate nitrogen can reach 100% under an aerobic environment, and the removal rate of the hexavalent chromium can reach more than 80%.
The method described above, characterized in that: when the concentration of hexavalent chromium in the sewage is in the range of 4-8 mg/L, the strain can use nitrate nitrogen as a unique nitrogen source, the removal rate of the nitrate nitrogen can reach 100% under an aerobic environment, and the removal rate of the hexavalent chromium can reach more than 70%.
The invention has the beneficial effects that:
(1) the Achromobacter sp can perform aerobic denitrification by taking nitrate nitrogen as a nitrogen source and organic matters as a carbon source, can reduce hexavalent chromium into trivalent chromium, and can synchronously remove the hexavalent chromium and the nitrate nitrogen only through an aerobic stage; the problem that anoxic denitrification and aerobic nitrification are required to be adopted for segmented treatment in the conventional wastewater treatment for biological denitrification is solved; in addition, the process flow is simplified, and the cost of equipment and investment is saved, so that the method has great economic benefit and environmental protection benefit;
(2) the strain is inoculated into sewage containing hexavalent chromium and nitrate nitrogen, under the existence of 0-15 mg/L Cr (VI), preferably 0-8 mg/L Cr (VI), the removal rate of the nitrate nitrogen reaches 100%, and the removal rate of the hexavalent chromium is 70-90%, so that the strain has the capabilities of efficiently removing the hexavalent chromium and aerobic denitrification. This characteristic makes the bacterium more practical in town sewage treatment systems.
Drawings
FIG. 1 shows the simultaneous dechromisation and denitrification properties of Achromobacter in the presence of 2mg/L Cr (VI).
FIG. 2 shows the simultaneous dechromisation and denitrification properties of Achromobacter in the presence of 4mg/L Cr (VI).
FIG. 3 shows the simultaneous dechromisation and denitrification properties of Achromobacter in the presence of 8mg/L Cr (VI).
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.
In the following examples, unless otherwise specified, all methods are conventional.
In the following examples, the percentages are by mass unless otherwise specified.
Example 1 Simultaneous dechromisation and denitrification Properties of Achromobacter in the Presence of 2mg/L Cr (VI)
The denitrification performance test medium (BM) formulation is as follows: 8.45g CH3COONa,0.63g NH4Cl,0.61g NaNO3,1.76g K2HPO4·3H2O,0.20g MgSO4·7H2O,0.02g CaCl2,0.005g FeSO4·7H2O,0.1mL of trace element solution. The pH of the medium was adjusted to 7.5 and sterilized at 121 ℃ for 30 min.
Inoculating Achromobacter sp in BM culture medium containing 2mg/L Cr (VI), performing shake culture at 30 deg.C and 150rpm, and sampling 100 μ L headspace gas with valve needle every 5h for measuring N2O, 2mL of gas was drawn with a sterile syringe and injected into a 2L pure helium bag for NO determination. At the same time2mL of the bacterial suspension is extracted by a sterile syringe, the bacterial liquid is centrifuged for 5min at 8000rpm and 4 ℃, and the supernatant is taken for analyzing the nitrate nitrogen, nitrite nitrogen and Cr (VI) concentration.
As shown in FIG. 1, 100mg/L nitrate nitrogen was used by the strain immediately after inoculation and was completely consumed within 15h, with an average removal rate of 6.67 mg/L/h. Nitrite nitrogen accumulated rapidly with the reduction of nitrate nitrogen and reached a maximum of 46.0mg/L over 10h and then was reduced over 20 h. Intermediates of the denitrification process, NO and N2The highest values of the O accumulation amount are 6.2 mug/L and 0.98mg/L, which only account for 0.0062 percent and 0.48 percent of the nitrate nitrogen removal amount, and meanwhile, the removal rate of Cr (VI) is as high as 90 percent, which shows that the strain has the capability of efficiently removing hexavalent chromium and aerobic denitrification.
Example 2 Simultaneous dechromisation and denitrification Properties of Achromobacter in the Presence of 4mg/L Cr (VI)
Achromobacter sp was inoculated in BM medium containing 4mg/L Cr (VI) to test aerobic denitrification performance. As shown in FIG. 2, 100mg/L nitrate nitrogen was used by the strain immediately after inoculation and was completely consumed within 20h, with an average removal rate of 5.0 mg/L/h. Nitrite nitrogen gradually accumulated with the reduction of nitrate nitrogen and reached a maximum of 53.5mg/L over 15h and then was reduced over 25 h. N is a radical of2O also gradually accumulated to a maximum of 10.2mg/L over 25h and was then completely reduced over 40 h. It must be pointed out that the highest value of the NO accumulation of the intermediate product in the denitrification process is 9.5 mu g/L and only accounts for 0.0095 percent of the removal amount of the nitrate nitrogen; meanwhile, the removal rate of Cr (VI) is as high as 80 percent. It can be seen that the Achromobacter still has the capability of removing hexavalent chromium and aerobic denitrification in the presence of 4mg/L Cr (VI).
EXAMPLE 3 Simultaneous dechromisation and denitrification Properties of Achromobacter in the Presence of 8mg/L Cr (VI)
Achromobacter sp was inoculated in BM medium containing 8mg/L Cr (VI) to test aerobic denitrification performance. As a result, as shown in FIG. 3, 100mg/L of nitrate nitrogen was used by the strain immediately after inoculation and was completely consumed within 30 hours, and the average removal rate of nitrate nitrogen was highThe rate was 3.33 mg/L/h. Nitrite nitrogen gradually accumulated with the reduction of nitrate nitrogen and reached a maximum of 64.2mg/L over 20h and then was reduced over 40 h. At the same time, N2O also gradually accumulated to a maximum of 21.6mg/L over 35h and was then completely reduced over 50 h. It should be noted that the maximum value of the NO accumulation amount of the intermediate product in the denitrification process at this time was 7.6. mu.g/L, which was only 0.0076% of the nitrate nitrogen removal amount. Meanwhile, the removal rate of Cr (VI) was 70%. It can be seen that the Achromobacter still has the capability of removing hexavalent chromium and aerobic denitrification in the presence of 8mg/L Cr (VI) (see Table 1).
TABLE 1 dechromisation and denitrification characteristics of Achromobacter sp in the presence of different concentrations of Cr (VI)
| Cr(VI)(mg/L) | Nitrate nitrogen removal rate of 40h | Total nitrogen removal rate of 40h | 40h Cr (VI) |
| 2 | 100％ | 100％ | 90％ |
| 5 | 100％ | 100％ | 80％ |
| 8 | 100％ | 90％ | 70％ |
EXAMPLE 4 Simultaneous dechromisation and denitrification Properties of Achromobacter in the Presence of 15mg/L Cr (VI)
Achromobacter sp was inoculated in BM medium containing 15mg/L Cr (VI) to test aerobic denitrification performance. The growth of the strain was significantly inhibited and nitrate nitrogen was hardly removed, and it can be seen that 15mg/L Cr (VI) is the upper concentration limit of the strain, and the strain does not have aerobic denitrification capability under this condition.
Example 5 application of Achromobacter in chromium-containing wastewater
Adding achromobacter into an activated sludge system to treat chromium-containing wastewater, continuing aeration to keep the dissolved oxygen of the system at 6mg/L, wherein the water quality of the wastewater is as follows: the pH value is 7.5, the nitrogen content of nitrate is 100mg/L, and Cr (VI) is 5 mg/L. As shown in Table 2, in the conventional activated sludge system, the denitrification effect was greatly affected in the presence of Cr (VI). However, in the case of the system after the enrichment with Achromobacter, the nitrate nitrogen removal rate was 90.4% at 36 hours, the total nitrogen removal rate was 87.1%, and the Cr (VI) removal rate was 73.5% (see Table 2).
TABLE 2 results of dechromization and denitrification of Achromobacter in activated sludge system
It should be noted that the above-mentioned embodiments are only for describing the invention in further detail, and are not intended to limit the invention, and those skilled in the art can make various modifications or changes within the scope not departing from the spirit and spirit of the invention, and still fall into the protection scope of the appended claims.
Claims (1)
1. An application of Achromobacter sp with hexavalent chromium removal and aerobic denitrification performance in sewage treatment is characterized in that: the preserving number of the achromobacter is CGMCC No 2964, nitrate nitrogen can be used as a nitrogen source, organic matters can be used as a carbon source for aerobic denitrification, and hexavalent chromium can be reduced to trivalent chromium, so that the nitrate nitrogen and the hexavalent chromium can be removed under aerobic conditions; the application comprises the steps of adding Achromobacter sp into sewage containing nitrate nitrogen and hexavalent chromium, and adding a proper amount of carbon source for aeration, so that the nitrate nitrogen and the hexavalent chromium in the sewage can be removed; controlling the temperature of the sewage containing nitrate nitrogen and hexavalent chromium to be 30 ℃; controlling the pH value of the sewage containing nitrate nitrogen and hexavalent chromium to be 7.5; controlling the dissolved oxygen in the sewage containing nitrate nitrogen and hexavalent chromium to be 6 mg/L; controlling the initial C/N ratio in the sewage containing nitrate nitrogen and hexavalent chromium to be 4; when the concentration of hexavalent chromium in the sewage is in the range of 0-4 mg/L, the strain can use nitrate nitrogen as a unique nitrogen source, the removal rate of the nitrate nitrogen can reach 100% under an aerobic environment, and the removal rate of the hexavalent chromium can reach more than 80%; when the concentration of hexavalent chromium in the sewage is in the range of 4-8 mg/L, the strain can use nitrate nitrogen as a unique nitrogen source, the removal rate of the nitrate nitrogen can reach 100% under an aerobic environment, and the removal rate of the hexavalent chromium can reach more than 70%.
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| Hexavalent Chromium Reduction from Pollutant Samples by Achromobacter xylosoxidans SHB 204 and its Kinetics Study;Swapna Tadishetty Hanumanth Rao等;《Indian J. Microbiol.》;20170605;第57卷(第3期);292-298 * |
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