CN111960532A - Sewage biological denitrification method and reaction device based on sulfur autotrophic short-cut denitrification - Google Patents
Sewage biological denitrification method and reaction device based on sulfur autotrophic short-cut denitrification Download PDFInfo
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 57
- 239000011593 sulfur Substances 0.000 title claims abstract description 57
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 46
- 239000010865 sewage Substances 0.000 title claims abstract description 43
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims abstract description 35
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 claims abstract description 32
- 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 abstract description 28
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 23
- 230000003647 oxidation Effects 0.000 claims abstract description 23
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 23
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 22
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 241000894006 Bacteria Species 0.000 claims abstract description 18
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 241001453382 Nitrosomonadales Species 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 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 description 10
- 239000002351 wastewater Substances 0.000 claims description 10
- 238000005191 phase separation Methods 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 34
- 229910021529 ammonia Inorganic materials 0.000 abstract description 17
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 3
- 230000001988 toxicity Effects 0.000 abstract description 3
- 231100000419 toxicity Toxicity 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 239000013067 intermediate product Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a biological sewage denitrification method based on sulfur autotrophic short-cut denitrification, which comprises the following steps: introducing a thiosulfate solution into the gas stripping upflow reactor from the bottom; the thiosulfate is decomposed into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in a reactor; introducing sewage containing ammonia nitrogen and nitrate into an air-lift type upflow reactor from the bottom; the elemental sulfur and the sulfite respectively generate short-range denitrification reaction with the nitrate, and the generated nitrite nitrogen and ammonia nitrogen generate nitrogen under the action of anaerobic ammonia oxidizing bacteria. The invention solves the problems of toxicity of hydrogen sulfide or low reaction rate of elemental sulfur in the process of sulfur autotrophic denitrification by selecting a new sulfur source; by means of sulfur autotrophic short-range denitrification, stable nitrite nitrogen is provided for anaerobic ammonia oxidation, and autotrophic nitrogen removal treatment based on anaerobic ammonia oxidation is realized.
Description
Technical Field
The invention relates to the technical field of biological sewage treatment, in particular to a biological sewage denitrification method and a biological sewage denitrification reaction device based on sulfur autotrophic short-cut denitrification.
Background
For sewage containing ammonia nitrogen and nitrate at the same time, the traditional process usually needs a combined technology of nitrification and denitrification. Firstly, nitrifying bacteria are required to convert ammonia nitrogen into nitrate nitrogen under an aeration condition, and then, denitrification is carried out by adding an organic carbon source to convert the nitrate nitrogen into nitrogen.
The discovery of anaerobic ammonium oxidation bacteria opens up a new nitrogen circulation way, and the autotrophic nitrogen removal of sewage becomes possible. Unlike traditional heterotrophic denitrification, anaerobic ammonia oxidation does not require an organic carbon source as an electron donor for the denitrification process and as a carbon source for biosynthesis. Anaerobic ammonia oxidation is biosynthesized by using inorganic carbon as autotrophic bacteria; the process has the advantages that on the one hand, a large amount of excess sludge is not generated, and on the other hand, organic matters in the sewage can be maximally used for anaerobic methanogenesis so as to improve the recovery rate of energy in the sewage. In addition, anammox autotrophic denitrification can reduce the need for dissolved oxygen because only half of the ammonia nitrogen in the wastewater needs to be oxidized to nitrite nitrogen, whereas traditional heterotrophic denitrification requires the oxidation of all ammonia nitrogen to nitrate nitrogen.
The combined technology of partial nitrification and anaerobic ammonia oxidation is a main method for realizing anaerobic ammonia oxidation autotrophic nitrogen removal treatment of sewage at present. Wherein the short-cut nitrification technology is a technology for oxidizing ammonia nitrogen into nitrite nitrogen. However, short-cut nitrification techniques can over-oxidize to further oxidize nitrite nitrogen to nitrate nitrogen, thereby affecting the stability of providing nitrous acid. On the other hand, nitrite nitrogen can also be provided through a short-range denitrification process, and recent research reports show that a biomembrane retained in an anaerobic environment can perform short-range denitrification, namely nitrate nitrogen can be reduced into nitrite nitrogen, and nitrite nitrogen is accumulated in the denitrification process, so that nitrite nitrogen is provided for anaerobic ammonia oxidizing bacteria. However, the short-cut denitrification technology is based on heterotrophic denitrifying bacteria, and excess sludge is generated in the denitrification process by utilizing an organic carbon source, occupies the living space of anaerobic ammonia oxidizing bacteria excessively or influences the mass transfer process, so that the activity of anaerobic ammonia oxidation is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a biological sewage denitrification method and a biological sewage denitrification device based on sulfur autotrophic short-cut denitrification, which utilize sulfide to replace organic carbon to carry out autotrophic denitrification reaction, convert nitrate nitrogen into nitrite nitrogen and further provide the nitrite nitrogen for anaerobic ammonia oxidizing bacteria.
The technical scheme adopted by the invention for solving the technical problem is to provide a biological sewage denitrification method based on sulfur autotrophic short-cut denitrification, which comprises the following steps:
step S1, introducing the thiosulfate solution into the air-lift type upflow reactor from the bottom;
s2, decomposing thiosulfate into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in a reactor;
step S3, introducing the sewage containing ammonia nitrogen and nitrate into an air-lift type upflow reactor from the bottom;
and S4, carrying out short-range denitrification reaction on the elemental sulfur and the sulfite with nitrate respectively, and generating nitrogen by using the generated nitrite nitrogen and ammonia nitrogen under the action of anaerobic ammonium oxidation bacteria.
In the method for biological denitrification of wastewater based on sulfur autotrophic short-cut denitrification provided by the invention, the step S4 comprises the following steps:
the sulfite and the nitrate are subjected to rapid short-cut denitrification reaction, and the generated nitrite nitrogen and ammonia nitrogen are subjected to the action of anaerobic ammonium oxidation bacteria to generate nitrogen;
the elemental sulfur and the nitrate are subjected to slow short-cut denitrification reaction, and the generated nitrite nitrogen and ammonia nitrogen are subjected to the action of anaerobic ammonia oxidizing bacteria to generate nitrogen.
In the biological denitrification method for sewage based on sulfur autotrophic short-cut denitrification provided by the invention, in step S1, the molar ratio of thiosulfate to ammonia nitrogen to nitrate nitrogen is 0.8-2: 1: 1.
in the biological denitrification method of sewage based on sulfur autotrophic short-cut denitrification provided by the invention, the hydraulic retention time of sewage and thiosulfate solution in an air stripping type upflow reactor is 12-24 h.
The biological sewage denitrification method based on the sulfur autotrophic short-cut denitrification further comprises the following steps:
collecting gas generated in the reaction process by controlling a three-phase separation device arranged at the upper part of the gas stripping type upflow reactor;
the liquid in the lift-type upflow reactor is stirred by continuously reinjecting the collected gas back into the lift-type upflow reactor with a gas circulation pump.
In the sewage biological denitrification method based on the sulfur autotrophic short-cut denitrification, the shearing strength of stirring is 2-4S-1。
Correspondingly, the invention also provides a reaction device for the biological nitrogen removal method of the sewage based on the sulfur autotrophic short-cut denitrification, which comprises a sewage storage device, a thiosulfate storage device, an air-lift type upflow reactor, a water outlet storage device and a water bath device, wherein the sewage storage device and the thiosulfate storage device are respectively connected with the bottom inlet of the air-lift type upflow reactor through water inlet pipes; the thiosulfate is decomposed into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in a reactor; introducing sewage containing ammonia nitrogen and nitrate into an air-lift type upflow reactor from the bottom; the elemental sulfur and the sulfite respectively generate short-range denitrification reaction with the nitrate, and the generated nitrite nitrogen and ammonia nitrogen generate nitrogen under the action of anaerobic ammonia oxidizing bacteria.
The reaction device provided by the invention also comprises a three-phase separation device, an air bag and a gas circulating pump which are arranged at the upper part of the gas lift type upflow reactor, wherein gas generated in the reaction process is collected by controlling the three-phase separation device, and the collected gas is continuously injected back into the gas lift type upflow reactor by the gas circulating pump to stir liquid in the gas lift type upflow reactor.
The implementation of the invention can achieve the following beneficial effects: compared with the traditional sulfur autotrophic reaction process, the method solves the problems of toxicity of hydrogen sulfide or low sulfur simple substance reaction rate in the sulfur autotrophic denitrification process by selecting a new sulfur source; compared with the traditional biological denitrification process, the method provides stable nitrite nitrogen for anaerobic ammonia oxidation by means of sulfur autotrophic short-cut denitrification, and realizes autotrophic denitrification treatment based on anaerobic ammonia oxidation; the short-cut denitrification based on sulfur autotrophy produces less excess sludge than the heterotrophic short-cut denitrification process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic diagram of a reaction apparatus for a biological denitrification method of wastewater based on sulfur autotrophic short-cut denitrification according to the present invention;
FIG. 2 is a schematic diagram of the reaction process of the biological denitrification method for sewage based on sulfur autotrophic short-cut denitrification provided by the invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of some, and not necessarily all, embodiments of the invention. All other embodiments obtained by a person skilled in the art based on the embodiments described in the present specification without any inventive step are within the scope of the present invention.
The invention provides a sewage biological denitrification method based on sulfur autotrophic short-cut denitrification, which is realized by a reaction device shown in figure 1. As shown in fig. 1, the reaction apparatus includes a sewage storage device 10 for storing sewage, a thiosulfate storage device 20 for storing thiosulfate solution, an air-lift type upflow reactor 30 for reacting sewage and thiosulfate solution, an effluent storage device 40 for storing effluent, and a water bath device 50 for controlling reaction temperature, wherein the sewage storage device 10 and the thiosulfate storage device 20 are respectively connected to a bottom inlet of the air-lift type upflow reactor 30 through water inlet pipes, the air-lift type upflow reactor 30 is connected to the effluent storage device 40 through water outlet pipes, and the water bath device 50 is sleeved outside the air-lift type upflow reactor 30. When in use, the thiosulfate solution is introduced into the gas stripping type upflow reactor from the bottom; the thiosulfate is decomposed into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in a reactor; introducing sewage containing ammonia nitrogen and nitrate into an air-lift type upflow reactor from the bottom; the elemental sulfur and the sulfite respectively generate short-range denitrification reaction with the nitrate, and the generated nitrite nitrogen and ammonia nitrogen generate nitrogen under the action of anaerobic ammonia oxidizing bacteria.
In the reaction process, the short-cut denitrification reaction of elemental sulfur and sulfite with nitrate is divided into two stages, firstly, the sulfite and the nitrate are subjected to the rapid short-cut denitrification reaction, and the generated nitrite nitrogen and ammonia nitrogen generate nitrogen under the action of anaerobic ammonia oxidizing bacteria; then, the elemental sulfur and the nitrate are subjected to slow short-cut denitrification reaction, and the generated nitrite nitrogen and ammonia nitrogen are subjected to the action of the anaerobic ammonia oxidizing bacteria to generate nitrogen.
In the reaction process, the mol ratio of thiosulfate to ammonia nitrogen to nitrate nitrogen is 0.8-2: 1: 1; the hydraulic retention time of the sewage and the thiosulfate solution in the gas stripping type upflow reactor is 12-24 h.
FIG. 2 is a schematic diagram of the reaction process of the biological denitrification method for sewage based on sulfur autotrophic short-cut denitrification provided by the invention. The invention is completed by adding a proper amount of thiosulfate into sewage containing ammonia nitrogen and nitrate simultaneously and controlling the combined technology of sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation through two-stage reaction: in the first stage, the rapid short-range denitrification reaction of the thiosulfate consumes part of the thiosulfate, and simultaneously, part of the thiosulfate is converted into an intermediate product sulfur simple substance under the action of sulfur oxidizing bacteria; the second stage reaction process is to perform slow short-range denitrification reaction on the sulfur simple substance as the intermediate product to keep the continuous production of nitrite nitrogen, thereby realizing the continuous supply of nitrite nitrogen for the anaerobic ammonia oxidation bacteria.
Further, the reaction device further comprises a three-phase separation device 60, an air bag 70 and a gas circulation pump 80 which are arranged at the upper part of the gas lift type upflow reactor 30, the gas generated in the reaction process is collected by controlling the three-phase separation device, and the collected gas is continuously injected back into the gas lift type upflow reactor by the gas circulation pump to stir the liquid in the gas lift type upflow reactor. Controlling the shearing strength in the stripping and stirring process to be 2-4S by adjusting the gas circulation flow-1. The reactor is controlled to operate under anaerobic condition, and the ORP is between-200 and-400 mV. Through collecting, circulating the nitrogen gas that produces among the reaction sequence, provide the mixed power of stirring for the reactor on the one hand, the steam stripping process can reduce on the other hand that micro-bubble is wrapped in the mud floc, solves the problem that leads to mud come-up.
The sewage biological denitrification method and the reaction device based on the sulfur autotrophic short-cut denitrification have the following advantages:
1. compared with the traditional sulfur autotrophic reaction process, the method solves the problems of toxicity of hydrogen sulfide or low sulfur simple substance reaction rate in the sulfur autotrophic denitrification process by selecting a new sulfur source;
2. compared with the traditional biological denitrification process, the method provides stable nitrite nitrogen for anaerobic ammonia oxidation by means of sulfur autotrophic short-cut denitrification, and realizes autotrophic denitrification treatment based on anaerobic ammonia oxidation;
3. the short-cut denitrification based on sulfur autotrophy has less output of residual sludge than that produced in the heterotrophic short-cut denitrification process;
4. sulfur autotrophic denitrification may also convert more nitrate to nitrogen.
The reactor and the control method are used for treating the synthetic wastewater in a laboratory, and the main components of the synthetic wastewater comprise: 200mg/L of sodium thiosulfate, 100mg/L of nitrate nitrogen and 100mg/L of ammonia nitrogen. The reactor was run for 200 consecutive days with the following data:
from the above, the combined technology of sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation is completed by two-stage reaction: in the first stage, the rapid short-range denitrification reaction of the thiosulfate consumes part of the thiosulfate, and simultaneously, part of the thiosulfate is converted into an intermediate product sulfur simple substance under the action of sulfur oxidizing bacteria; the second stage reaction process is to perform slow short-range denitrification reaction on the sulfur simple substance as the intermediate product to keep the continuous production of nitrite nitrogen, thereby realizing the continuous supply of nitrite nitrogen for the anaerobic ammonia oxidation bacteria. The reaction results are shown in the following table:
in the above example implementation, it can be seen that the combined technology of sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation can be successfully applied to the steam lift flow reactor. Through calculation, the total nitrogen removal rate in the reaction process is over 80%, wherein the anaerobic ammonia oxidation contributes 90% of the total nitrogen removal, and the sulfur autotrophic denitrification contributes 10%.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and many modifications may be made by those skilled in the art without departing from the spirit and the scope of the present invention as defined in the appended claims.
Claims (8)
1. The biological sewage denitrification method based on the sulfur autotrophic short-cut denitrification is characterized by comprising the following steps:
step S1, introducing the thiosulfate solution into the air-lift type upflow reactor from the bottom;
s2, decomposing thiosulfate into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in a reactor;
step S3, introducing the sewage containing ammonia nitrogen and nitrate into an air-lift type upflow reactor from the bottom;
and S4, carrying out short-range denitrification reaction on the elemental sulfur and the sulfite with nitrate respectively, and generating nitrogen by using the generated nitrite nitrogen and ammonia nitrogen under the action of anaerobic ammonium oxidation bacteria.
2. The biological nitrogen removal method for wastewater based on sulfur autotrophic short-cut denitrification according to claim 1, wherein the step S4 comprises:
the sulfite and the nitrate are subjected to rapid short-cut denitrification reaction, and the generated nitrite nitrogen and ammonia nitrogen are subjected to the action of anaerobic ammonium oxidation bacteria to generate nitrogen;
the elemental sulfur and the nitrate are subjected to slow short-cut denitrification reaction, and the generated nitrite nitrogen and ammonia nitrogen are subjected to the action of anaerobic ammonia oxidizing bacteria to generate nitrogen.
3. The method for biological denitrification of sewage based on sulfur autotrophic short-cut denitrification according to claim 1, wherein in step S1, the molar ratio of thiosulfate to ammonia nitrogen to nitrate nitrogen is 0.8-2: 1: 1.
4. the process for the biological nitrogen removal from wastewater based on sulfur autotrophic short-cut denitrification according to claim 1, wherein the hydraulic retention time of wastewater and thiosulfate solution in the gas stripping type upflow reactor is 12-24 h.
5. The method for biological denitrification of wastewater based on sulfur autotrophic short-cut denitrification according to claim 1, further comprising:
collecting gas generated in the reaction process by controlling a three-phase separation device arranged at the upper part of the gas stripping type upflow reactor;
the liquid in the lift-type upflow reactor is stirred by continuously reinjecting the collected gas back into the lift-type upflow reactor with a gas circulation pump.
6. The method for biological denitrification of wastewater based on sulfur autotrophic short-cut denitrification according to claim 6, wherein the shear strength of the agitation is 2-4S-1。
7. A reaction device for the biological denitrification method of sewage based on the sulfur autotrophic short-cut denitrification of claims 1-6, which comprises a sewage storage device, a thiosulfate storage device, an air-lift type upflow reactor, a water outlet storage device and a water bath device, wherein the sewage storage device and the thiosulfate storage device are respectively connected with the bottom inlet of the air-lift type upflow reactor through water inlet pipes, the air-lift type upflow reactor is connected with the water outlet storage device through water outlet pipes, the water bath device is sleeved outside the air-lift type upflow reactor, and during use, thiosulfate solution is introduced into the air-lift type upflow reactor from the bottom; the thiosulfate is decomposed into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in a reactor; introducing sewage containing ammonia nitrogen and nitrate into an air-lift type upflow reactor from the bottom; the elemental sulfur and the sulfite respectively generate short-range denitrification reaction with the nitrate, and the generated nitrite nitrogen and ammonia nitrogen generate nitrogen under the action of anaerobic ammonia oxidizing bacteria.
8. The sulfur autotrophic short-cut denitrification-based reaction device according to claim 7, further comprising a three-phase separation device, an air bag and a gas circulation pump, wherein the three-phase separation device, the air bag and the gas circulation pump are arranged at the upper part of the gas lift type upflow reactor, and the gas generated in the reaction process is collected by controlling the three-phase separation device, and then the collected gas is continuously injected back into the gas lift type upflow reactor by the gas circulation pump, so that the liquid in the gas lift type upflow reactor is stirred.
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