CN110510743B - One-step denitrification device and method based on ferric salt circulation - Google Patents
One-step denitrification device and method based on ferric salt circulation Download PDFInfo
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- CN110510743B CN110510743B CN201910920168.7A CN201910920168A CN110510743B CN 110510743 B CN110510743 B CN 110510743B CN 201910920168 A CN201910920168 A CN 201910920168A CN 110510743 B CN110510743 B CN 110510743B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 253
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 30
- 239000012528 membrane Substances 0.000 claims abstract description 26
- 239000002351 wastewater Substances 0.000 claims abstract description 17
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 16
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- -1 iron ions Chemical class 0.000 claims abstract description 11
- 241000894006 Bacteria Species 0.000 claims abstract description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 10
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- 238000010992 reflux Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 17
- 244000005700 microbiome Species 0.000 claims description 16
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- NPFOYSMITVOQOS-UHFFFAOYSA-K iron(III) citrate Chemical compound [Fe+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NPFOYSMITVOQOS-UHFFFAOYSA-K 0.000 claims description 13
- 239000000969 carrier Substances 0.000 claims description 12
- 229960002413 ferric citrate Drugs 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 241001453382 Nitrosomonadales Species 0.000 claims description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 230000000813 microbial effect Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000001651 autotrophic effect Effects 0.000 abstract description 9
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 230000001546 nitrifying effect Effects 0.000 abstract description 4
- 239000001272 nitrous oxide Substances 0.000 abstract description 3
- 239000012141 concentrate Substances 0.000 abstract description 2
- 230000004060 metabolic process Effects 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 239000012295 chemical reaction liquid Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 229910001447 ferric ion Inorganic materials 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 159000000014 iron salts Chemical class 0.000 description 3
- 238000012163 sequencing technique Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a one-step denitrification device and a one-step denitrification method based on ferric salt circulation, wherein a first reaction chamber is arranged above a second reaction chamber and is connected with a water inlet pipe of the second reaction chamber, and the first reaction chamber is used for nitrifying reaction to generate nitrous oxide and ferric iron; the nitrifying reaction liquid enters a second reaction chamber from a first reaction chamber; the second reaction chamber is used for autotrophic denitrification reaction, nitrate and ferrous iron from the first reaction chamber react to generate nitrogen and ferric iron, so that denitrification is realized; the water outlet end of the second reaction chamber is provided with a reverse osmosis membrane for intercepting iron ions, the second reaction chamber is provided with a return pipe interface, and the concentrated ferric iron solution is returned to the first reaction chamber for recycling. According to the invention, nitrifying bacteria and denitrifying bacteria are separated in two reaction chambers, so that different living environments are provided for growth and metabolism; ferric iron concentrate generated in the second reaction chamber flows back to the first reaction chamber, and one-step denitrification of the wastewater is realized by recycling ferric salt, so that the method has innovation consciousness and practical value.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a one-step denitrification device and method based on ferric salt circulation.
Background
The traditional denitrification technology takes organic matters as electron donors, and has high denitrification efficiency but high investment cost. Especially after the 'source control and emission reduction' is implemented nationwide, the organic pollution of the water body is effectively controlled, the C/N ratio in the water body is greatly reduced, and the need for a novel autotrophic denitrification technology is urgent.
The short-cut nitrification-anaerobic ammonia oxidation technology is used as a novel autotrophic denitrification technology and is applied to the treatment of actual wastewater, however, the popularization and application of the short-cut nitrification-anaerobic ammonia oxidation technology are hindered due to the difficulty in control of short-cut nitrification and the 'delicate' of anaerobic ammonia oxidation bacteria.
In 1996, straub et al proposed autotrophic denitrification techniques, where microorganisms utilized ferrous salts as electron donors for denitrification. Once the technology is proposed, the technology is paid attention to by a large number of scholars. The iron type autotrophic denitrification technology has the advantages of high safety, no toxicity, low price and the like.
Another iron-type ammoxidation technique, in which ammonia oxidizing bacteria oxidize ammonium ions to nitrates using ferric iron as an electron acceptor, has emerged.
However, autotrophic denitrification using iron has a problem that iron salts cannot be effectively utilized, and iron salts need to be continuously added in the autotrophic denitrification stage, so that the utilization rate of the iron salts is low, and the requirement of recycling is not met.
Disclosure of Invention
The invention aims to provide a one-step denitrification device and method based on ferric salt circulation, which are used for solving the problem of low ferric salt utilization rate in the autotrophic denitrification process in the prior art.
In order to achieve the above purpose, the specific technical scheme adopted by the invention is as follows:
a one-step denitrification device based on ferric salt circulation comprises a first reaction chamber and a second reaction chamber, wherein the first reaction chamber is arranged above the second reaction chamber, and the first reaction chamber is connected with the second reaction chamber through a water inlet pipe of the second reaction chamber; a filter screen is arranged at the upper port of the water inlet pipe of the second reaction chamber, a first dosing pipe and a first exhaust port are arranged at the top of the first reaction chamber, and a second dosing pipe and a second exhaust port are arranged at the top of the second reaction chamber; microorganism carriers are uniformly distributed in the first reaction chamber and the second reaction chamber, wherein ammonia oxidizing bacteria capable of performing ammonia oxidation by ferric iron are attached to the microorganism carriers in the first reaction chamber, and denitrifying bacteria capable of performing denitrification by ferrous iron are attached to the microorganism carriers in the second reaction chamber; the bottom of the second reaction chamber is provided with a mud bucket, and the bottom of the mud bucket is connected with a mud pipe; the first reaction chamber and the second reaction chamber are internally provided with stirring devices, and the first reaction chamber is also provided with a first reaction chamber water inlet pipe; the second reaction chamber is provided with a water outlet pipe, the inlet end of the water outlet pipe is provided with a reverse osmosis membrane, and the second reaction chamber is connected with the first reaction chamber through a reflux branch; a pH meter is disposed in the second reaction chamber.
The water inlet pipe of the first reaction chamber is connected with the lower part of the first reaction chamber; the inlet of the water outlet pipe of the second reaction chamber and the inlet of the return pipe are connected with the lower part of the second reaction chamber.
The second reaction chamber is connected with a high-pressure pump to participate in the reverse osmosis process, and is used for providing a negative pressure condition when the reverse osmosis membrane performs reverse osmosis.
The reflux branch comprises a reflux pump, an inlet of the reflux pump is connected with the lower part of the second reaction chamber through a pipeline, and an outlet of the reflux pump is connected with an inlet of the first reaction chamber through a pipeline.
The one-step denitrification method based on ferric salt circulation is carried out by adopting the one-step denitrification device based on ferric salt circulation, and comprises the following steps of:
the waste water containing ammonia enters a first reaction chamber through a water inlet pipe of the first reaction chamber, and ferric salt is added into the first reaction chamber through a first dosing pipe in the form of ferric citrate; the stirring device in the first reaction chamber continuously stirs, the ammonia-containing wastewater reacts with the microorganism carrier in the first reaction chamber, gas generated by the reaction is discharged through the first exhaust port, and mixed solution containing ferrous ions and nitrate generated by the reaction flows into the second reaction chamber through the water inlet pipe and the filter screen of the second reaction chamber;
in the second reaction chamber, the stirring device is used for continuously stirring, nitrate and ferrous ions are denitrified and denitrified under the action of a microbial carrier in the second reaction chamber, and generated gas is discharged along with a second exhaust port; adding a preset amount of acid from a second dosing pipe to ensure that the second reaction chamber is always non-alkaline;
when the second reaction chamber is drained through the water outlet pipe, the reverse osmosis membrane intercepts ferric ions in the second reaction chamber, along with the drainage of the second reaction chamber, the concentration of ferric ions in the second reaction chamber rises, when the pressure difference between the inside and the outside of the reverse osmosis membrane is larger than a preset value, the water outlet pipe and the water inlet pipe of the second reaction chamber are stopped, and liquid in the second reaction chamber is returned to the first reaction chamber through the return branch for recycling.
Iron salt is added into a first reaction chamber in the form of ferric citrate from a first dosing pipe, and the mass ratio of the added ferric citrate to the ammonia nitrogen in the wastewater is (8.16-10.88): 1, a step of; the ratio of the amount of the added ferric citrate substance to the amount of the ammonia nitrogen substance in the wastewater is (6-8): 1.
the second dosing tube is added with hydrochloric acid, and the mol ratio of hydrochloric acid to ferric citrate is (0.5-0.7): 1.
the ratio of the hydraulic retention time of the first reaction chamber to the hydraulic retention time of the second reaction chamber is (0.5-0.7): 1.
the pH in the first reaction chamber is 7.0-8.5, and the pH in the second reaction chamber is 6.0-7.0.
The pressure difference between the inside and the outside of the reverse osmosis membrane is not more than the critical value of the reverse osmosis membrane blockage.
The invention has the following beneficial effects:
the one-step denitrification device based on ferric salt circulation utilizes the upper and lower two different reaction chambers (namely the first reaction chamber and the second reaction chamber) of the reaction body device, reduces competition among different strains, provides more favorable living environment for the strains with different ecological niches, and is favorable for stable operation of the one-step denitrification device; the circulation of ferric salt is realized, the concentrated solution of the ferric ions trapped in the second reaction chamber is supplied to the first reaction chamber for recycling through the reflux branch, the resource is recovered, and the ferric salt demand of wastewater denitrification is greatly reduced. Because the iron ions are totally trapped in the second reaction chamber by the reverse osmosis membrane, no loss of the iron ions exists, so that the utilization rate of ferric salt is increased; according to the invention, nitrifying bacteria and denitrifying bacteria are separated in two reaction chambers, so that different living environments are provided for growth and metabolism; ferric iron concentrate generated in the second reaction chamber flows back to the first reaction chamber, and one-step denitrification of the wastewater is realized by recycling ferric salt, so that the method has innovation consciousness and practical value.
The one-step denitrification method based on ferric salt circulation has no iron ion loss, so that the utilization rate of ferric salt is increased, the ferric salt demand of wastewater denitrification is greatly reduced, the one-step denitrification of the ferric salt on the wastewater can be realized through cyclic utilization, and the method has the characteristics of short flow, full utilization of resources and good denitrification effect.
Drawings
FIG. 1 is a schematic diagram of a one-step denitrification device based on ferric salt circulation according to the present invention.
FIG. 2 is a process flow diagram of a one-step denitrification process based on ferric salt recycle of the present invention.
FIG. 3 is a diagram showing quincuncial hole distribution details of a dosing tube in the one-step denitrification device based on ferric salt circulation.
In the figure: i-a first reaction chamber and II-a second reaction chamber; 1-first reaction chamber inlet tube, 2-first valve, 3-microorganism carrier, 4-first charge pipe, 5-second charge pipe, 6-agitating unit, 7-filter screen, 8-first gas vent, 9-second gas vent, 10-pH meter, 11-reverse osmosis membrane, 12-outlet pipe, 13-second valve, 14-third valve, 15-reflux pump, 16-fourth valve, 17-reflux pipe, 18-mud bucket, 19-mud pipe, 20-fifth valve, 21-high pressure pump, 22-second reaction chamber inlet tube, 23-sixth valve, 24-through hole.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description. The preferred embodiments may be combined in any desired manner unless specifically stated or conflicting.
Referring to FIG. 1, the one-step denitrification device based on ferric salt circulation of the invention comprises a first reaction chamber I and a second reaction chamber II, wherein the first reaction chamber I is arranged above the second reaction chamber II, and the first reaction chamber I and the second reaction chamber II are connected through a second reaction chamber water inlet pipe 22; the upper port of the water inlet pipe 22 of the second reaction chamber is provided with a filter screen 7, the top of the first reaction chamber I is provided with a first dosing pipe 4 and a first exhaust port, and the top of the second reaction chamber II is provided with a second dosing pipe 5 and a second exhaust port; microorganism carriers 3 are uniformly distributed in the first reaction chamber I and the second reaction chamber II, wherein ammonia oxidizing bacteria capable of performing ammonia oxidation by ferric iron are attached to the microorganism carriers 3 in the first reaction chamber I, and denitrifying bacteria capable of performing denitrification by ferrous iron are attached to the microorganism carriers 3 in the second reaction chamber II; the bottom of the second reaction chamber II is provided with a mud bucket 18, and the bottom of the mud bucket 18 is connected with a mud pipe 19; the inside of the first reaction chamber I and the inside of the second reaction chamber II are respectively provided with a stirring device 6, and the first reaction chamber I is also provided with a first reaction chamber water inlet pipe 1; the second reaction chamber II is provided with a water outlet pipe 12, the inlet end of the water outlet pipe 12 is provided with a reverse osmosis membrane 11, and the second reaction chamber II is connected with the first reaction chamber I through a reflux branch; a pH meter 10 is disposed in the second reaction chamber ii.
As a preferred embodiment of the present invention, the first reaction chamber inlet pipe 1 is connected to the lower part of the first reaction chamber I.
As a preferred embodiment of the invention, the inlet of the second reaction chamber water outlet pipe 12 and the inlet of the return pipe 17 are connected with the lower part of the second reaction chamber II.
As a preferred embodiment of the invention, the second reaction chamber II is connected with a high-pressure pump 21 to participate in the reverse osmosis process, and is used for providing a negative pressure condition when the reverse osmosis membrane is subjected to reverse osmosis.
As a preferred embodiment of the invention, the return branch comprises a return pump 15, the inlet of the return pump 15 being connected to the lower part of the second reaction chamber ii by a pipe, and the outlet of the return pump 15 being connected to the inlet of the first reaction chamber i by a pipe.
As a preferred embodiment of the present invention, referring to fig. 1 to 3, the first and second dosing tubes 4 and 5 of the present invention have the same structure and a hollow tubular structure, and the lower surfaces of the first and second dosing tubes 4 and 5 are uniformly provided with through holes.
Referring to fig. 2 and 1, the one-step denitrification method based on ferric salt circulation of the present invention comprises the following processes:
the wastewater containing ammonia enters a first reaction chamber I through a first reaction chamber water inlet pipe 1, and ferric salt is added into the first reaction chamber I through a first chemical adding pipe 4 in the form of ferric citrate; the stirring device 6 in the first reaction chamber I continuously stirs, the ammonia-containing wastewater reacts with the microorganism carrier 3 in the first reaction chamber I, gas generated by the reaction is discharged through the first exhaust port, and mixed liquor containing ferrous ions and nitrate generated by the reaction flows to the second reaction chamber II through the second reaction chamber water inlet pipe 22 and the filter screen 7;
in the second reaction chamber II, the stirring device 6 is continuously stirred, nitrate and ferrous ions are denitrified and denitrified under the action of the microbial carrier 3 in the second reaction chamber II, and the generated gas is discharged along with the second exhaust port; adding a preset amount of acid from a second dosing pipe 5 to ensure that the second reaction chamber II is always non-alkaline;
when the second reaction chamber II is drained through the water outlet pipe 12, the reverse osmosis membrane 11 intercepts iron ions in the second reaction chamber II, the concentration of the iron ions in the second reaction chamber II rises along with the drainage of the second reaction chamber II, when the pressure difference between the inside and the outside of the reverse osmosis membrane 11 is larger than a preset value, the water outlet pipe 12 and the water inlet pipe 22 of the second reaction chamber II are stopped, and liquid in the second reaction chamber II is returned to the first reaction chamber I through a return branch for recycling.
Examples
As shown in FIG. 1, the one-step denitrification device based on ferric salt circulation in this embodiment mainly comprises a first reaction chamber I and a second reaction chamber II, and specifically further comprises: a first reaction chamber water inlet pipe 1, a second valve, a microorganism carrier 3, a first dosing pipe 4, a second dosing pipe 5, a stirring device 6, a filter screen 7, a first air outlet, a second air outlet, a pH meter 10, a reverse osmosis membrane 11, a water outlet pipe 12, a second valve 13, a third valve 14, a reflux pump 15, a fourth valve 16, a reflux pipe 17, a mud bucket 18, a mud discharge pipe 19, a fifth valve 20, a high-pressure pump 21, a second reaction chamber water inlet pipe 22 and a sixth valve 23.
In this embodiment, the one-step denitrification device based on ferric salt circulation is a sequencing batch reactor, the first reaction chamber I and the second reaction chamber II are connected by a second reaction chamber water inlet pipe 22, and a fourth valve 16 is connected to the second reaction chamber water inlet pipe 22. As shown in fig. 1, a filter screen 7 is provided at the inlet of the second reaction chamber inlet pipe 22 (i.e. the second reaction chamber inlet pipe 22 is located at one end of the first reaction chamber i), and the filter screen 7 is used for retaining biological filler. The top of the first reaction chamber I is provided with a first dosing pipe 4 and a first exhaust port 8, and the top of the second reaction chamber II is provided with a second dosing pipe 5 and a second exhaust port 9; microorganism carriers 3 are uniformly distributed in the first reaction chamber I and the second reaction chamber II, wherein ammonia oxidizing bacteria capable of performing ammonia oxidation by ferric iron are attached to the microorganism carriers 3 of the first reaction chamber I, and denitrifying bacteria capable of performing denitrification by ferrous iron are attached to the microorganism carriers 3 of the second reaction chamber II; the bottom of the second reaction chamber II is provided with a mud bucket 18 and a mud discharging pipe 19, the mud discharging pipe 19 is connected with the bottom of the mud bucket 18, and a fifth valve 20 is arranged on the mud discharging pipe 19. The first reaction chamber water inlet pipe 1 is positioned at the right lower side of the first reaction chamber I, the first valve 2 is arranged on the first reaction chamber water inlet pipe 1, and the stirring device 6 is arranged in the first reaction chamber I; the water outlet pipe 12 and the return pipe 17 of the second reaction chamber are positioned at the left lower side of the second reaction chamber II, a reverse osmosis membrane 11 is arranged at the water outlet pipe 12, a high-pressure pump 21 is connected with the lower part of the second reaction chamber II, and a sixth valve 23 is arranged on a pipeline connecting the high-pressure pump 21 and the second reaction chamber II; the water outlet pipe 12 is also provided with a second valve 13; the return pipe 17 is provided with a filter screen 7; the return pipe 17 is provided with a return pump 15, the return pipe 17 connected with the inlet of the return pump 15 is provided with a third valve 14, and the return pipe 17 connected with the outlet of the return pump 15 is connected with the first reaction chamber water inlet pipe 1. The second reaction chamber II is also provided with a stirring device 6.
A reverse osmosis membrane 11 is arranged in front of a water outlet pipe 12 of a second reaction chamber II, after the denitrification reaction of the second reaction chamber II is finished, a second valve 13 and a sixth valve 23 are opened, a third valve 14 is closed, and the solution in the second reaction chamber II continuously enters the water outlet pipe 12 through the reverse osmosis membrane 11; when the pressure difference between the inside and the outside of the reverse osmosis membrane reaches 15psi (namely 1.5 kg, the critical value of blocking the reverse osmosis membrane), the second valve 13, the fourth valve 16 and the sixth valve 23 are closed, so that the second reaction chamber II is not fed with water any more, the reflux pump 15 is opened, the third valve 14 is opened, so that the water in the second reaction chamber II passes through the filter screen 7, the reflux pump 15 pressurizes the concentrated mixed solution of the iron ions, and the mixed solution flows back to the first reaction chamber water inlet pipe 1 through the reflux pipe 17 and then enters the first reaction chamber I for recycling.
The size and the proportion of each device can be set according to the situation, and in the sequencing batch reactor, the one-step denitrification device based on ferric salt circulation is characterized in that the main bodies of the first reaction chamber I and the second reaction chamber II are cylinders, and the mud bucket 18 is a cone. The total height of the one-step denitrification device is 750mm, and the diameter of the cylinder at the upper part of the first reaction chamber I is 240mm; the diameter of the upper cylinder of the second reaction chamber II is 190mm. The sequencing batch reactor (i.e., the one-step denitrification device of this embodiment) has a total effective volume of 25L and a working volume of 24L. Iron citrate is added into the first dosing tube 4: the mass ratio of ammonia nitrogen is (8.16-10.88): 1 (or the molar ratio is (0.6-0.8): 1); the volume ratio of the first reaction chamber I to the second reaction chamber II is 1.0:1.0; the ratio of hydraulic retention time is (0.5-0.7): 1, a step of; the first dosing tube 4 and the second dosing tube 5 have the same structure, small holes are arranged at the lengths of 1/3 of the bottoms of the first dosing tube and the second dosing tube respectively, the small holes are distributed in a quincuncial shape, the diameters of the small holes are 1/10 of the diameters of the dosing tubes, and the distance between the small holes is 5 times of the diameter of a single small hole; the upper part of the mud bucket 18 in the reaction chamber has an inclination angle of 40 degrees with the horizontal plane.
In the embodiment, the one-step denitrification device based on ferric salt circulation is made of organic glass, wherein the material of the mixed liquor return pipe is PVC. The one-step denitrification method based on ferric salt comprises the following steps: the wastewater containing ammonia enters a first reaction chamber I through a first reaction chamber water inlet pipe 1, and ferric salt is added into the first reaction chamber I through a first chemical adding pipe 4 in the form of ferric citrate; the stirring device 6 is used for continuously stirring to prevent the biological filler from sinking so as to meet the requirement of ammonia oxidation reaction, and the nitrous oxide generated by the reaction and ferrous ions can rapidly react under the acidic condition, so that nitrous oxide gas is generated and discharged through the first exhaust port 8. After the reaction in the first reaction chamber I, the mixed solution containing ferrous ions and nitrate is produced and flows to the second reaction chamber II through the water inlet pipe 22 of the second reaction chamber and the filter screen 7, the second reaction chamber II is in an anoxic condition, and the stirrer 6 is arranged in the second reaction chamber II so that the reaction is fully carried out. The nitrate and ferrous ions are denitrified and denitrified under the action of autotrophic denitrifying bacteria, and the generated nitrogen is discharged along with the second exhaust port 9. The mixed solution generated by the first reaction chamber I is acidic, part of hydroxide ions generated by the second reaction chamber II can be neutralized, in order to ensure that the solution in the second reaction chamber II is acidic and no ferric hydroxide precipitate is generated, a proper amount of hydrochloric acid is specially added from the second dosing tube 5, and the pH meter 10 monitors the reaction conditions on line, so that the solution in the second reaction chamber II of the system is always non-alkaline. The second valve 13 and the sixth valve 23 are opened, the third valve 14 is closed, a reverse osmosis membrane 11 is arranged at the position of a water outlet pipe 12 of the second reaction chamber to intercept ferric ions in the second reaction chamber II, the concentration of the ferric ions is continuously increased along with continuous water drainage of the second reaction chamber II, when the pressure difference between the inside and the outside of the reverse osmosis membrane 11 is greater than 15psi (namely 1.5 kg), the second valve 13, the fourth valve 16 and the sixth valve 23 are closed, the third valve 14 is opened, and concentrated ferric ions are returned to the water inlet pipe 1 of the first reaction chamber by a return pump 15 and then enter the first reaction chamber I for recycling. The second reaction chamber II is provided with a mud bucket 18 and a mud discharging pipe 19 for periodically discharging the fallen activated sludge. The bacterial colony is attached to the biological filler to form a biological film, and the organisms are uniformly distributed in the whole reaction chamber, so that the high-efficiency denitrification is facilitated.
Claims (4)
1. The one-step denitrification device based on ferric salt circulation is characterized by comprising a first reaction chamber (I) and a second reaction chamber (II), wherein the first reaction chamber (I) is arranged above the second reaction chamber (II), and the first reaction chamber (I) and the second reaction chamber (II) are connected through a second reaction chamber water inlet pipe (22); a filter screen (7) is arranged at the upper port of a water inlet pipe (22) of the second reaction chamber, a first dosing pipe (4) and a first exhaust port (8) are arranged at the top of the first reaction chamber (I), and a second dosing pipe (5) and a second exhaust port (9) are arranged at the top of the second reaction chamber (II); microorganism carriers (3) are uniformly distributed in the first reaction chamber (I) and the second reaction chamber (II), wherein ammonia oxidizing bacteria capable of performing ammonia oxidation by ferric iron are attached to the microorganism carriers (3) in the first reaction chamber (I), and denitrifying bacteria capable of performing denitrification by ferrous iron are attached to the microorganism carriers (3) in the second reaction chamber (II); a mud bucket (18) is arranged at the bottom of the second reaction chamber (II), and a mud pipe (19) is connected to the bottom of the mud bucket (18); the inside of the first reaction chamber (I) and the inside of the second reaction chamber (II) are respectively provided with a stirring device (6), and the first reaction chamber (I) is also provided with a first reaction chamber water inlet pipe (1); the second reaction chamber (II) is provided with a water outlet pipe (12), the inlet end of the water outlet pipe (12) is provided with a reverse osmosis membrane (11), and the second reaction chamber (II) is connected with the first reaction chamber (I) through a backflow branch; a pH meter (10) is arranged in the second reaction chamber (II);
the water inlet pipe (1) of the first reaction chamber is connected with the lower part of the first reaction chamber (I); the inlet of the water outlet pipe (12) of the second reaction chamber and the inlet of the return pipe (17) are connected with the lower part of the second reaction chamber (II);
the second reaction chamber (II) is connected with a high-pressure pump (21);
the reflux branch comprises a reflux pump (15), an inlet of the reflux pump (15) is connected with the lower part of the second reaction chamber (II) through a pipeline, and an outlet of the reflux pump (15) is connected with an inlet of the first reaction chamber (I) through a pipeline;
the method for performing one-step denitrification by adopting the one-step denitrification device based on ferric salt circulation comprises the following steps:
the ammonia-containing wastewater enters a first reaction chamber (I) through a first reaction chamber water inlet pipe (1), ferric salt is added into the first reaction chamber (I) through a first dosing pipe (4) in the form of ferric citrate, a stirring device (6) in the first reaction chamber (I) is continuously stirred, the ammonia-containing wastewater reacts with a microbial carrier (3) in the first reaction chamber (I), gas generated by the reaction is discharged through a first exhaust port (8), and mixed liquid containing ferrous ions and nitrate generated by the reaction flows into a second reaction chamber (II) through a second reaction chamber water inlet pipe (22) and a filter screen (7);
in the second reaction chamber (II), the stirring device (6) is continuously stirred, nitrate and ferrous ions are denitrified and denitrified under the action of the microbial carrier (3) in the second reaction chamber (II), and the generated gas is discharged along with the second exhaust port (9); adding a preset amount of acid from a second dosing pipe (5) to ensure that the second reaction chamber (II) is always non-alkaline;
when the second reaction chamber (II) is drained through the water outlet pipe (12), the reverse osmosis membrane (11) intercepts iron ions in the second reaction chamber (II), the concentration of the iron ions in the second reaction chamber (II) rises along with the drainage of the second reaction chamber (II), and when the internal and external pressure difference of the reverse osmosis membrane (11) is larger than a preset value, the water outlet pipe (12) and the water inlet pipe (22) of the second reaction chamber are intercepted, and liquid in the second reaction chamber (II) is returned to the first reaction chamber (I) through a return branch for recycling;
the ratio of the hydraulic retention time of the first reaction chamber (I) to the hydraulic retention time of the second reaction chamber (II) is (0.5-0.7): 1, a step of;
the pH in the first reaction chamber (I) is 7.0-8.5, and the pH in the second reaction chamber (II) is 6.0-7.0.
2. The one-step denitrification device based on ferric salt circulation according to claim 1, wherein ferric salt is added into the first reaction chamber (I) from the first dosing tube (4) in the form of ferric citrate, and the mass ratio of the added ferric citrate to the ammonia nitrogen in the wastewater is (8.16-10.88): 1, a step of; the ratio of the amount of the added ferric citrate substance to the amount of the ammonia nitrogen substance in the wastewater is (6-8): 1.
3. the one-step denitrification device based on ferric salt circulation according to claim 2, wherein the second dosing tube (5) is added with hydrochloric acid, and the molar ratio of hydrochloric acid to ferric citrate is (0.5-0.7): 1.
4. the one-step denitrification device based on ferric salt circulation according to claim 1, wherein the pressure difference between the inside and outside of the reverse osmosis membrane (11) is not more than the critical value of blocking of the reverse osmosis membrane (11).
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| CN112694172B (en) * | 2021-01-15 | 2024-01-23 | 青岛思普润水处理股份有限公司 | CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system and operation method |
| CN112811593B (en) * | 2021-01-15 | 2023-11-28 | 青岛思普润水处理股份有限公司 | Iron-based autotrophic nitrogen and phosphorus removal system based on MBBR and operation method |
| CN113415910B (en) * | 2021-06-04 | 2023-01-13 | 北京工业大学 | Device and method for denitrification coupling anaerobic ammonium oxidation biological nitrogen and phosphorus removal in iron ammonium oxidation enhanced AAO process |
| CN114409101B (en) * | 2022-03-31 | 2022-07-12 | 北京林业大学 | Nitrogen and phosphorus removal sewage treatment system and method based on iron reduction and oxidation circulation |
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