CN117756286A - Method for strengthening stability of short-cut nitrification-anaerobic ammonia oxidation process by using biochar - Google Patents
Method for strengthening stability of short-cut nitrification-anaerobic ammonia oxidation process by using biochar Download PDFInfo
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- CN117756286A CN117756286A CN202311690729.1A CN202311690729A CN117756286A CN 117756286 A CN117756286 A CN 117756286A CN 202311690729 A CN202311690729 A CN 202311690729A CN 117756286 A CN117756286 A CN 117756286A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 74
- 230000008569 process Effects 0.000 title claims abstract description 58
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 45
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 45
- 230000003647 oxidation Effects 0.000 title claims abstract description 42
- 238000005728 strengthening Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000012163 sequencing technique Methods 0.000 claims abstract description 18
- 239000010802 sludge Substances 0.000 claims abstract description 17
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002351 wastewater Substances 0.000 claims abstract description 6
- 238000005273 aeration Methods 0.000 claims description 18
- 230000014759 maintenance of location Effects 0.000 claims description 8
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 7
- 238000000197 pyrolysis Methods 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000006396 nitration reaction Methods 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 31
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- 239000006227 byproduct Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- 241000284466 Antarctothoa delta Species 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a method for strengthening the stability of a short-cut nitrification-anaerobic ammonia oxidation process by using biochar, which comprises the following steps: firstly, wastewater enters a sequencing batch short-cut nitrification reactor, and effluent of the sequencing batch short-cut nitrification reactor enters an adjusting tank and then enters an expanded granular sludge bed anaerobic ammonia oxidation reactor to carry out biological denitrification; step two, adding biochar into an anaerobic ammoxidation reactor of an expanded granular sludge bed; and step three, running a short-cut nitrification-anaerobic ammonia oxidation process, running a stage under the working condition that the concentration of ammonia nitrogen in the inlet water is 300mg/L, and then sequentially adjusting the concentration of the ammonia nitrogen in the inlet water to 500 and 800mg/L, and measuring the triazo in the outlet water of the reactor every two days. The invention promotes the short-range denitrification process in the system by adding the biochar so as to overcome the accumulation and short-range nitrate nitrogen in the processWater NO from the process nitration system 2 ‑ /NH 4 + The denitrification performance of the process is unstable under fluctuation.
Description
Technical Field
The invention relates to the technical field of biological denitrification treatment of sewage, in particular to a method for strengthening the stability of a short-cut nitrification-anaerobic ammonia oxidation process by using biochar.
Background
The application range of the existing biological denitrification process in practical engineering is the traditional nitrification/denitrification process. However, the nitrification process requires aeration energy consumption, and the denitrification process requires additional organic carbon sources, so that the process has high energy consumption and high operation cost, and the process has high residual sludge yield and large occupied area of water treatment facilities. Therefore, an economic and efficient biological denitrification technology is urgently needed in the sewage denitrification field. Anaerobic ammonia oxidation is a novel biological autotrophic nitrogen removal technology, and compared with a nitrification/denitrification process, the anaerobic ammonia oxidation technology becomes a research hot spot in the field of environmental protection due to the advantages of no need of additional organic carbon source, low aeration energy consumption, low sludge yield, low capital construction cost and the like. The application of anaerobic ammonia oxidation technology in the field of wastewater treatment still faces many challenges.
Nitrite nitrogen/ammonia Nitrogen (NO) required by anaerobic ammonia oxidation reaction theory 2 - /NH 4 + ) 1.32, but nitrite nitrogen is typically absent from untreated wastewater. To solve this problem, a short-cut nitrification system is usually coupled to the front end of the anaerobic ammonia oxidation system. However, stable operation of short-cut nitrification-anaerobic ammoxidation process (PN-A) depends on effective control of Nitrite Oxidizing BacteriA (NOB) activity and proliferation in short-cut nitrification system, excessive proliferation of NOB bacteriA can increase nitrate nitrogen in effluent and competitively inhibit functional microorganisms, so that NO in effluent of system 2 - /NH 4 + Unstable, thereby reducing the denitrification rate and stability of the PN-A process. However, NOB bacteria are difficult to be stably controlled under the disturbance of external environmental factors (such as temperature, dissolved oxygen, nitrogen concentration, pH, etc.), which greatly increasesThe control difficulty of the PN-A process is added, so that the process is limited in practical application. In addition, 11% of nitrate nitrogen byproducts generated in the anaerobic ammoniA oxidation process cannot be further removed, so that the theoretical denitrification rate of the PN-A process only reaches 89%, and the effluent quality is difficult to stably reach the emission standard when wastewater containing high-concentration ammoniA nitrogen is treated. The two aspects restrict the practical application of the short-cut nitrification-anaerobic ammonia oxidation process.
Therefore, the NO of the anaerobic ammonia oxidation system to the effluent of the short-cut nitrification system is improved 2 - /NH 4 + The fluctuation impact resistance can reduce the operation regulation difficulty, and the removal of the nitrate nitrogen byproducts generated in the anaerobic ammonia oxidation process becomes the main engineering technical problem of the practical application of the process.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a method for improving the denitrification stability of a short-cut nitrification-anaerobic ammonia oxidation process by adding biochar, which promotes the short-cut denitrification process in a system by adding biochar so as to overcome the accumulation of nitrate nitrogen and NO in effluent of a short-cut nitrification system in the process 2 - /NH 4 + The denitrification performance of the process is unstable under fluctuation.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for strengthening the stability of a short-cut nitrification-anaerobic ammonia oxidation process by using biochar comprises the following steps:
firstly, wastewater enters a sequencing batch short-cut nitrification reactor, and effluent of the sequencing batch short-cut nitrification reactor enters an adjusting tank and then enters an expanded granular sludge bed anaerobic ammonia oxidation reactor to carry out biological denitrification;
step two, adding biochar into an anaerobic ammoxidation reactor of an expanded granular sludge bed;
and step three, running a short-cut nitrification-anaerobic ammonia oxidation process, running a stage under the working condition that the concentration of ammonia nitrogen in the inlet water is 300mg/L, and then sequentially adjusting the concentration of the ammonia nitrogen in the inlet water to 500 and 800mg/L, and measuring the triazo in the outlet water of the reactor every two days.
The effective volume of the sequencing batch short-cut nitrification reactor is 2L, and the hydraulic retention time is 8h.
The effective volume of the expanded granular sludge bed anaerobic ammonia oxidation reactor is 0.5L, and the hydraulic retention time is 4h.
The operation mode of the sequencing batch short-cut nitration reactor is 2 hours and one period: water is fed for 5 minutes, aeration stirring is carried out for 90 minutes, standing and precipitation are carried out for 15 minutes, water is discharged for 10 minutes, and the discharged water enters the regulating tank.
The aeration mode of the sequencing batch short-cut nitrification reactor is continuous aeration, and dissolved oxygen is controlled to be 0.1-0.4 mg/L.
The biochar is prepared by pyrolyzing wood dust at 300 ℃ for 2 hours.
The addition amount of the biochar is 10g/L, the particle size is 0.25-1 mm, and the addition mode is one-time addition.
The reactor is operated for more than 25 days at each inlet water concentration.
The biochar promotes the reduction of nitrate nitrogen and supplements a portion of the nitrite nitrogen required for the anaerobic ammoxidation reaction.
The invention has the beneficial effects that:
the invention realizes the coupling of short-cut denitrification and anaerobic ammoxidation in the same reactor, and improves the NO of the effluent of the short-cut nitrification system by the anaerobic ammoxidation system 2 - /NH 4 + The fluctuation impact resistance improves the stability of the denitrification performance of the short-cut nitrification-anaerobic ammonia oxidation process and reduces the fluctuation range of the denitrification rate of the process.
The invention fully utilizes the biochar to promote the continuous reduction of the nitrate nitrogen which is a reaction byproduct, and improves the denitrification performance of the short-cut nitrification-anaerobic ammonia oxidation process.
According to the invention, under the condition of no external organic carbon source, short-range denitrification in the reactor is realized by adding the biochar, and the process running cost and the risk of overflow of greenhouse gas nitrous oxide are reduced.
Drawings
FIG. 1 is a schematic diagram of the reactor system as a whole.
FIG. 2 shows the concentration of the tri-nitrogen in the water fed into and discharged from the reactor and the denitrification rate.
FIG. 3 shows the water inlet and outlet reaction mole ratio and denitrification pathway contribution of an anaerobic ammoxidation reactor.
Detailed Description
The invention adds the biochar into the short-cut nitrification-anaerobic ammoxidation process, utilizes the biochar to promote the short-cut denitrification process of nitrate nitrogen which is a reaction byproduct, and supplements NO in effluent of a short-cut nitrification system 2 - /NH 4 + Fluctuation Shi Ya nitrate nitrogen deficiency improves NO resistance of an anaerobic ammonia oxidation system 2 - /NH 4 + The impact capability is fluctuated, so that the denitrification rate and the stability of the whole process are improved.
As shown in fig. 1: a method for strengthening the stability of a short-cut nitrification-anaerobic ammonia oxidation process by using biochar comprises the following steps:
firstly, wastewater enters a sequencing batch short-cut nitrification reactor, and effluent of the sequencing batch short-cut nitrification reactor enters an adjusting tank and then enters an expanded granular sludge bed anaerobic ammonia oxidation reactor to carry out biological denitrification; the effective volume of the sequencing batch short-cut nitrification reactor is 2L, and the hydraulic retention time is 8h. The effective volume of the expanded granular sludge bed anaerobic ammonia oxidation reactor is 0.5L, and the hydraulic retention time is 4h. The operation mode of the sequencing batch short-cut nitration reactor is 2 hours and one period: water is fed for 5 minutes, aeration stirring is carried out for 90 minutes, standing and precipitation are carried out for 15 minutes, water is discharged for 10 minutes, and the discharged water enters the regulating tank. The aeration mode of the sequencing batch short-cut nitrification reactor is continuous aeration, and dissolved oxygen is controlled to be 0.1-0.4 mg/L.
Step two, adding biochar into an anaerobic ammoxidation reactor of an expanded granular sludge bed; the biochar is prepared by pyrolyzing wood dust at 300 ℃ for 2 hours. The addition amount of the biochar is 10g/L, the particle size is 0.25-1 mm, and the addition mode is one-time addition.
And step three, running a short-cut nitrification-anaerobic ammonia oxidation process, wherein the running time of each water inlet concentration of the reactor is longer than 25 days. And (3) operating for one stage under the working condition that the ammonia nitrogen concentration of the inlet water is 300mg/L, and then sequentially adjusting the ammonia nitrogen concentration of the inlet water to 500 and 800mg/L, and measuring the triazo of the outlet water of the reactor every two days.
The present invention will be described in further detail with reference to examples.
Example 1
Construction of a short-cut nitrification-anaerobic ammonia oxidation process:
it can be observed from fig. 1 that the short-cut nitrification-anaerobic ammonia oxidation process is divided into three parts. The short-cut nitrification system is carried out in a Sequencing Batch Reactor (SBR), and effluent enters a regulating tank and then enters two Expanded Granular Sludge Bed (EGSB) anaerobic ammonia oxidation reactors in parallel, wherein one is a biochar group, and the other is a blank group.
The running period of the SBR reactor is 2 hours, the water is fed for 5 minutes, the aeration/stirring is carried out for 90 minutes, the standing is carried out for 15 minutes, the water is discharged for 10 minutes, 500ml of water is fed and discharged each time, the effective volume is 2L, and the hydraulic retention time is 8 hours. Aeration is provided by an aeration pump, the aeration amount is controlled by a glass rotameter, and a continuous aeration strategy is adopted to control the dissolved oxygen to be 0.1-0.4 mg/L.
The effective volume of the EGSB reactor is 500mL, the hydraulic retention time is 4 hours, the peristaltic pump is used for controlling continuous water inlet from the bottom and continuous water outlet from the upper part, and the operation modes of the two EGSB reactors are kept consistent.
The SBR reactor seed sludge is taken from a fourth sewage treatment plant in the western America, and the EGSB reactor seed sludge is taken from an upflow anaerobic sludge blanket anaerobic ammonia oxidation reactor operated for a long time in a laboratory.
Example 2
Operation and index determination of short-cut nitrification-anaerobic ammonia oxidation process
The reactor was run for 27 days at an influent ammonia nitrogen concentration of 300mg/L and 25 days at influent ammonia nitrogen concentrations of 500 and 800mg/L, with the triazo of the reactor measured every two days.
As can be observed from FIG. 2, the short-cut nitrification stage aeration strategy adopts continuous low dissolved oxygen aeration, and the dissolved oxygen is controlled to be 0.1-0.4 mg/L. Short-cut nitrification section effluent NO 2 - /NH 4 + The accumulation rate of nitrate nitrogen is kept to be 0.6-1.1, and the minimum accumulation rate of nitrate nitrogen is 0.6%.
As can be seen from FIG. 2, the removal rate of nitrite nitrogen in both the biochar group and the blank group can exceed 90%, but the denitrification rate of the biochar group is 75.9+ -13.0% higher than 66.8+ -12.9% of the blank group, mainly because the ammonia nitrogen removal rate of the biochar group is about 23.12% higher than that of the blank group, and the accumulation amount of nitrate nitrogen is 44.2mg/L lower. This shows that the addition of biochar promotes the reduction of nitrate nitrogen and significantly increases the denitrification rate of the shortcut nitrification-anaerobic ammonia oxidation process.
It can be seen from FIG. 3 that the blank group has a.DELTA.NO throughout the operation 2 - /ΔNH 4 + And delta NO 3 - /ΔNH 4 + The ratio of delta NO of the biochar group is 1.08 and 0.36 respectively 2 - /ΔNH 4 + And delta NO 3 - /ΔNH 4 + The ratios of 0.97 and 0.24, respectively, were significantly lower than the blank group, because the addition of biochar promoted the reduction of nitrate nitrogen and supplemented some of the nitrite nitrogen required for the anaerobic ammoxidation reaction. According to the analysis of the denitrification contribution rate, the part of the biochar group with higher denitrification rate than the blank group is mainly the biochar-mediated partial denitrification coupling anaerobic ammonia oxidation reaction, the denitrification rate in the biochar group can reach 22.7%, and the blank group is only 4.3%. This shows that the addition of biochar mainly promotes the reduction of nitrate nitrogen to nitrite nitrogen rather than the whole course of denitrification. This reduces the risk of greenhouse gas spillage.
By comparing the ammonia nitrogen concentration of the effluent, the accumulation amount of nitrate nitrogen, the total nitrogen removal rate and the denitrification contribution rate of the added biochar group and the blank group, the addition of the biochar can be verified to promote the short-cut denitrification process of the nitrate nitrogen byproducts in the short-cut nitrification-anaerobic ammonia oxidation process and solve the problems of the accumulation of nitrate nitrogen in the short-cut nitrification-anaerobic ammonia oxidation process and the NO of effluent of a short-cut nitrification system 2 - /NH 4 + The denitrification performance of the process is unstable under fluctuation, so that the denitrification performance and the stability of the process are improved.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (9)
1. A method for strengthening the stability of a short-cut nitrification-anaerobic ammonia oxidation process by using biochar is characterized by comprising the following steps:
firstly, wastewater enters a sequencing batch short-cut nitrification reactor, and effluent of the sequencing batch short-cut nitrification reactor enters an adjusting tank and then enters an expanded granular sludge bed anaerobic ammonia oxidation reactor to carry out biological denitrification;
step two, adding biochar into an anaerobic ammoxidation reactor of an expanded granular sludge bed;
and step three, running a short-cut nitrification-anaerobic ammonia oxidation process, running a stage under the working condition that the concentration of ammonia nitrogen in the inlet water is 300mg/L, and then sequentially adjusting the concentration of the ammonia nitrogen in the inlet water to 500 and 800mg/L, and measuring the triazo in the outlet water of the reactor every two days.
2. The method for enhancing the stability of a short-cut nitrification-anaerobic ammonia oxidation process by using biochar according to claim 1, wherein the effective volume of the sequencing batch short-cut nitrification reactor is 2L, and the hydraulic retention time is 8h.
3. The method for enhancing the stability of a shortcut nitrification-anammox process according to claim 1, wherein the effective volume of said expanded granular sludge bed anammox reactor is 0.5L and the hydraulic retention time is 4h.
4. The method for enhancing the stability of a short-cut nitrification-anaerobic ammonia oxidation process according to claim 1, wherein the operation mode of the sequencing batch short-cut nitrification reactor is 2 hours for one period: water is fed for 5 minutes, aeration stirring is carried out for 90 minutes, standing and precipitation are carried out for 15 minutes, water is discharged for 10 minutes, and the discharged water enters the regulating tank.
5. The method for enhancing the stability of a shortcut nitrification-anaerobic ammonia oxidation process by using biochar according to claim 1, wherein the aeration mode of the sequencing batch shortcut nitrification reactor is continuous aeration, and dissolved oxygen is controlled to be 0.1-0.4 mg/L.
6. The method for enhancing the stability of a shortcut nitrification-anammox process according to claim 1, wherein said biochar is prepared by pyrolysis of wood chips at 300 ℃ for 2 hours.
7. The method for reinforcing the stability of the shortcut nitrification-anaerobic ammonia oxidation process by using the biochar according to claim 1, wherein the adding amount of the biochar is 10g/L, the particle size is 0.25-1 mm, and the adding mode is one-time adding.
8. The method for enhancing the stability of a shortcut nitrification-anammox process in accordance with claim 1, wherein each influent concentration of said reactor is run for a period of time greater than 25 days.
9. The method for enhancing the stability of a short-cut nitrification-anaerobic ammonia oxidation process as set forth in claim 1, wherein the biochar promotes the reduction of nitrate nitrogen and supplements a part of nitrite nitrogen required for the anaerobic ammonia oxidation reaction.
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