CN114790038A - Ammonia-containing wastewater anaerobic ammonia oxidation and denitrification treatment integrated device and method - Google Patents
Ammonia-containing wastewater anaerobic ammonia oxidation and denitrification treatment integrated device and method Download PDFInfo
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- CN114790038A CN114790038A CN202110098942.8A CN202110098942A CN114790038A CN 114790038 A CN114790038 A CN 114790038A CN 202110098942 A CN202110098942 A CN 202110098942A CN 114790038 A CN114790038 A CN 114790038A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 262
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 131
- 239000002351 wastewater Substances 0.000 title claims abstract description 71
- 230000003647 oxidation Effects 0.000 title claims abstract description 70
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000000926 separation method Methods 0.000 claims abstract description 68
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 238000001556 precipitation Methods 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 239000006228 supernatant Substances 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 55
- 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 43
- 238000010992 reflux Methods 0.000 claims description 25
- 239000010802 sludge Substances 0.000 claims description 25
- 238000006396 nitration reaction Methods 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims 1
- 238000004062 sedimentation Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000003513 alkali Substances 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- -1 ammonia nitrogen rare earth Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
- 239000013589 supplement Substances 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/22—O2
-
- 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
- C02F2209/40—Liquid flow rate
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides an ammonia-containing wastewater anaerobic ammonia oxidation and denitrification treatment integrated device and method. Wherein, the ammonia wastewater anaerobic ammonia oxidation denitrification handles integrated device includes: a nitrification unit, wherein ammonia-containing wastewater is introduced into the nitrification unit for nitrification reaction; the nitrification unit is provided with a water distribution hole and is communicated with the sedimentation separation unit through the water distribution hole, and the mixed liquid after reaction in the nitrification unit enters the sedimentation separation unit from the water distribution hole to carry out mud-water separation; and the anaerobic ammonia oxidation denitrification unit is positioned at the upper part of the precipitation separation unit, supernatant obtained by separation in the precipitation separation unit enters the anaerobic ammonia oxidation denitrification unit to carry out anaerobic ammonia oxidation denitrification reaction, a water outlet is formed in the upper part of the anaerobic ammonia oxidation denitrification unit, and the supernatant after reaction in the anaerobic ammonia oxidation denitrification unit is discharged from the water outlet. The invention solves the problem of low denitrification efficiency of the anaerobic ammonia oxidation process in the prior art.
Description
Technical Field
The invention relates to the technical field of biological denitrification treatment of wastewater, in particular to an integrated device and method for anaerobic ammonia oxidation denitrification treatment of ammonia-containing wastewater.
Background
The biological denitrification treatment of the ammonia-containing wastewater mainly adopts a traditional nitrification and denitrification process, belongs to the whole-course nitrification and denitrification biological denitrification technology, and is difficult to further improve the denitrification efficiency due to the limitation of the internal circulation rate of the process, and simultaneously alkali liquor needs to be added in the nitrification stage, and a large amount of organic carbon sources need to be added in the denitrification stage. Anaerobic ammonium oxidation denitrification is a novel high-efficiency biological denitrification technology and enters an industrial application stage. Compared with the traditional nitrification and denitrification, the anaerobic ammonia oxidation has the characteristics of low energy consumption, low cost, low pollution and high efficiency. According to the biological reaction mechanism, the ratio of ammonia nitrogen to Nitrite (NH) in the inlet water of the anaerobic ammonia oxidation process unit 3 -N/NO 2 - -N) needs to be controlled within a specific range. However, in the nitration reaction process, because the adaptability of the nitrobacteria is strong, the ammonia nitrogen nitration reaction product is quickly converted into nitrate from nitrite, the accumulation rate of the nitrite is low and unstable, the nitration reaction process is difficult to obtain proper proportion of ammonia nitrogen and nitrite to output water, and the water quality requirement of a subsequent anaerobic ammonia oxidation denitrification unit cannot be met, which is one of the key factors influencing the denitrification efficiency of the anaerobic ammonia oxidation process to reach the design level.
Disclosure of Invention
The invention mainly aims to provide an integrated device and a method for ammonia-containing wastewater anammox denitrification treatment, which aim to solve the problem of low denitrification efficiency of an anammox process in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided an integrated apparatus for anammox denitrification treatment of ammonia-containing wastewater, comprising: a nitrification unit, wherein ammonia-containing wastewater is introduced into the nitrification unit for nitrification reaction; the nitrification unit is provided with a water distribution hole and is communicated with the sedimentation separation unit through the water distribution hole, and the mixed liquid after reaction in the nitrification unit enters the sedimentation separation unit from the water distribution hole to carry out mud-water separation; the anaerobic ammonium oxidation denitrification unit is positioned at the upper part of the precipitation separation unit, supernatant obtained by separation in the precipitation separation unit enters the anaerobic ammonium oxidation denitrification unit to carry out anaerobic ammonium oxidation denitrification reaction, a water outlet is formed in the upper part of the anaerobic ammonium oxidation denitrification unit, and the supernatant after reaction in the anaerobic ammonium oxidation denitrification unit is discharged from the water outlet; the nitrification unit, the precipitation separation unit and the anaerobic ammonia oxidation denitrification unit are arranged in a reaction device in a centralized way.
Furthermore, the precipitation separation unit is arranged outside the nitrification unit, and the water distribution holes are formed in the side wall of the top of the nitrification unit.
Further, ammonia-containing wastewater anammox denitrogenation handles integrated device still includes reflux unit, and reflux unit includes: the inlet end of the return pipe is positioned on the upper side wall of the anaerobic ammonia oxidation and denitrification unit, the outlet end of the return pipe is positioned in the nitrification unit, and part of the supernatant after the anaerobic ammonia oxidation and denitrification unit reacts flows back into the nitrification unit through the return pipe; and the pushing flow pump is positioned at the inlet end of the return pipe and drives part of clear liquid after the anaerobic ammonia oxidation denitrification reaction to enter the return pipe, and the height of a water suction port of the pushing flow pump is lower than that of a water outlet.
Furthermore, a sludge backflow seam is arranged at the bottom of the precipitation separation unit, and the concentrated sludge after sludge-water separation falls back to the nitrification unit through the sludge backflow seam.
Further, ammonia-containing wastewater anammox denitrogenation handles integrated device still includes: the bottom of the nitrification unit is provided with a water inlet, the water inlet is communicated with the water inlet, and ammonia-containing wastewater can be introduced into the nitrification unit; and the water outlet pipe is communicated with the water outlet, and the treated clear liquid is discharged through the water outlet pipe.
Further, the ammonia-containing wastewater anaerobic ammonia oxidation denitrification treatment integrated device also comprises: the stirring mechanism extends into the nitrification unit and can stir the liquid in the nitrification unit; and the aeration system extends into the nitrification unit from the bottom of the nitrification unit.
Further, the anaerobic ammonia oxidation denitrification unit comprises a plurality of groups of filling composite modules formed by filling composite.
According to another aspect of the present invention, there is provided an ammonia-containing wastewater anammox denitrification treatment method, wherein the ammonia-containing wastewater anammox denitrification treatment integrated apparatus comprises a nitrification unit, a precipitation separation unit and an anammox denitrification unit, and the ammonia-containing wastewater anammox denitrification treatment method comprises: allowing the ammonia-containing wastewater to enter a nitrification unit for nitrification reaction, oxidizing part of ammonia nitrogen in the ammonia-containing wastewater into nitrite nitrogen, and forming a mixed solution simultaneously containing the ammonia nitrogen and the nitrite nitrogen; the mixed solution after the nitration enters a precipitation separation unit for sludge-water separation, the separated supernatant enters an anaerobic ammonia oxidation denitrification unit, and the concentrated sludge falls back to the nitration unit; the supernatant liquid entering the anaerobic ammonia oxidation denitrification unit is subjected to anaerobic ammonia oxidation denitrification reaction, and ammonia nitrogen and nitrite nitrogen in the supernatant liquid are removed; and discharging clear liquid after passing through the anaerobic ammonia oxidation denitrification unit from a water outlet at the upper part.
Furthermore, the clear liquid after passing through the anaerobic ammonia oxidation denitrification unit is divided into two parts, wherein one part is discharged from a water outlet above the anaerobic ammonia oxidation denitrification unit, the other part flows back into the nitrification unit through a return pipe of the return device, and the return ratio R is 50-300%.
Further, when the nitration unit performs nitration reaction, the parameters of the nitration reaction are as follows: the dissolved oxygen DO is 0.3-2.5 mg/L, the pH value is 7.8-10, the total hydraulic retention time HRT is 2-4 h, the biological filler filling rate is 20% -30% or the mixed solution suspended matter concentration MLSS is 2600-4000 mg/L, and the nitrite nitrogen in the effluent of the nitrification unit is not lower than 10 mg/L.
Further, the anaerobic ammonia oxidation denitrification unit comprises a plurality of groups of filling composite modules formed by filling composite, the filling rate of composite filler of each group of filling composite modules is 60-80%, the dissolved oxygen DO is less than or equal to 0.5mg/L, and the total hydraulic retention time HRT is 2-4 h.
Further, when adjusting each parameter, the dissolved oxygen amount DO, the reflux ratio R, the water inflow rate, and the pH value are adjusted in this order.
By applying the technical scheme of the invention, the nitrification unit, the precipitation separation unit and the anaerobic ammonia oxidation denitrification unit are arranged in one reaction device, so that the nitrification unit, the precipitation separation unit and the anaerobic ammonia oxidation denitrification unit are integrally arranged. When the device is used, ammonia-containing wastewater firstly enters a partial nitrification unit for nitrification reaction, partial ammonia nitrogen in the ammonia-containing wastewater is oxidized into nitrite nitrogen to form mixed liquid containing both the ammonia nitrogen and the nitrite nitrogen, the mixed liquid immediately enters a precipitation separation unit for mud-water separation, separated supernatant enters an anaerobic ammonia oxidation denitrification unit in an upper clear water area for anaerobic ammonia oxidation denitrification reaction, the ammonia nitrogen and the nitrite nitrogen in the supernatant are removed, separated concentrated sludge falls back to the nitrification unit, and the supernatant after denitrification reaction can be discharged as standard treatment water. Through the above arrangement mode, three treatment functions of nitration reaction, precipitation separation and anaerobic ammonia oxidation denitrification are integrally designed, the proportion of ammonia nitrogen and nitrite nitrogen in the effluent of the nitration unit is not required to be limited, the effective removal of ammonia nitrogen and total nitrogen is realized, and the denitrification efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural diagram of an integrated device for the anammox denitrification treatment of ammonia-containing wastewater according to the present invention;
FIG. 2 shows a flow chart of the method for treating ammonia-containing wastewater by anammox denitrification in accordance with the present invention.
Wherein the figures include the following reference numerals:
10. a nitrification unit; 20. a precipitation separation unit; 30. an anammox denitrification unit; 40. water distribution holes; 50. a return pipe; 60. a water inlet pipe; 70. a water outlet pipe; 80. a stirring mechanism; 90. an aeration system.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problem of low denitrification efficiency of an anammox process in the prior art, the invention provides an ammonia-containing wastewater anammox denitrification treatment integrated device and method.
The integrated device for the anammox denitrification treatment of ammonia-containing wastewater shown in fig. 1 comprises a nitrification unit 10, a precipitation separation unit 20 and an anammox denitrification unit 30, wherein ammonia-containing wastewater is introduced into the nitrification unit 10 for nitrification reaction; the nitrification unit 10 is provided with a water distribution hole 40, the nitrification unit 10 is communicated with the precipitation separation unit 20 through the water distribution hole 40, and the mixed liquid after reaction in the nitrification unit 10 enters the precipitation separation unit 20 from the water distribution hole 40 to carry out mud-water separation; the anammox-denitrogenation unit 30 is positioned at the upper part of the precipitation separation unit 20, and supernatant obtained by separation in the precipitation separation unit 20 enters the anammox-denitrogenation unit 30 to carry out anammox-denitrogenation reaction, a water outlet is formed above the anammox-denitrogenation unit 30, and supernatant after reaction in the anammox-denitrogenation unit 30 is discharged from the water outlet; the nitrification unit 10, the precipitation separation unit 20 and the anaerobic ammonium oxidation denitrification unit 30 are arranged in a reactor in a centralized manner.
In the present embodiment, the nitrification unit 10, the precipitation separation unit 20, and the anammox denitrification unit 30 are provided in one reactor, so as to form an integrated structure. When the device is used, ammonia-containing wastewater firstly enters the partial nitrification unit 10 to carry out nitrification reaction, part of ammonia nitrogen in the ammonia-containing wastewater is oxidized into nitrite nitrogen to form mixed liquid simultaneously containing the ammonia nitrogen and the nitrite nitrogen, the mixed liquid immediately enters the precipitation separation unit 20 to carry out mud-water separation, separated supernatant enters the anaerobic ammonia oxidation denitrification unit 30 of an upper clear water area to carry out anaerobic ammonia oxidation denitrification reaction, the ammonia nitrogen and the nitrite nitrogen in the supernatant are removed, separated concentrated sludge falls back to the nitrification unit 10, and the supernatant after the denitrification reaction is finished can be taken as standard treated water to be discharged. Through the above arrangement, three treatment functions of nitrification reaction, precipitation separation and anaerobic ammonia oxidation denitrification are integrated, the proportion of ammonia nitrogen and nitrite nitrogen in the effluent of the nitrification unit 10 is not required to be limited, the effective removal of ammonia nitrogen and total nitrogen is realized, and the denitrification efficiency is improved.
In the present embodiment, the nitrification unit 10 is located at the center, the precipitation separation unit 20 is circumferentially disposed at the outer side of the nitrification unit 10, and the water distribution holes 40 are opened at the top side wall of the nitrification unit 10. Thus, as the ammonia-containing wastewater is continuously introduced into the nitrification unit 10, the liquid level of the mixed liquid after the nitrification reaction in the nitrification unit 10 rises until reaching the height of the water distribution holes 40, and then flows into the precipitation separation unit 20 from the water distribution holes 40, and the sludge and water are separated in the precipitation separation unit 20.
In this embodiment, the ammonia-containing wastewater anammox denitrification treatment integrated device further comprises a reflux device, the reflux device comprises a reflux pipe 50 and a push-flow pump, the inlet end of the reflux pipe 50 is located at the upper side wall of the anammox denitrification unit 30, the outlet end of the reflux pipe 50 is located in the nitrification unit 10, the push-flow pump is located at the inlet end of the reflux pipe 50 and drives part of clear liquid after anammox denitrification reaction to enter the reflux pipe 50, and the height of the water suction port of the push-flow pump is lower than the water outlet. The supernatant after the reaction of the anammox denitrification unit 30 is divided into two parts, one part enters the return pipe 50 under the suction action of the propeller pump, flows back into the nitrification unit 10 through the return pipe 50 to continue the nitrification reaction, and the other part is discharged through the water outlet.
Similar to the reflux device, in this embodiment, a sludge reflux slit is provided at the bottom of the sedimentation separation unit 20, and the concentrated sludge after the sludge-water separation falls back to the nitrification unit 10 through the sludge reflux slit.
In this embodiment, the integrated device for the anammox denitrification treatment of the ammonia-containing wastewater further comprises a water inlet pipe 60 and a water outlet pipe 70, wherein a water inlet is formed at the bottom of the nitrification unit 10, the water inlet pipe 60 is communicated with the water inlet and can introduce the ammonia-containing wastewater into the nitrification unit 10; the water outlet pipe 70 is communicated with the water outlet, and the treated clear liquid is discharged through the water outlet pipe 70.
In this embodiment, the integrated device for the anammox denitrification treatment of ammonia-containing wastewater further comprises a stirring mechanism 80 and an aeration system 90, wherein the stirring mechanism 80 extends into the nitrification unit 10 and can stir the liquid in the nitrification unit 10; the aeration system 90 extends into the nitrification unit 10 from the bottom of the nitrification unit 10, and the stirring mechanism 80 and the aeration system 90 respectively play roles of stirring and aeration so as to assist in promoting the nitrification reaction.
In the present embodiment, the anammox denitrification unit 30 includes a plurality of sets of packed composite modules composed of packed composite.
As shown in fig. 2, the present embodiment further provides an ammonia-containing wastewater anammox denitrification treatment method, which adopts the above ammonia-containing wastewater anammox denitrification treatment integrated apparatus, specifically includes a nitrification unit 10, a precipitation separation unit 20, an anammox denitrification unit 30, and the ammonia-containing wastewater anammox denitrification treatment method includes: allowing the ammonia-containing wastewater to enter a nitrification unit 10 for nitrification reaction, and oxidizing part of ammonia nitrogen in the ammonia-containing wastewater into nitrite nitrogen to form mixed liquid simultaneously containing the ammonia nitrogen and the nitrite nitrogen; the mixed solution after the nitration enters a precipitation separation unit 20 for sludge-water separation, the separated supernatant enters an anaerobic ammonia oxidation denitrification unit 30, and the concentrated sludge falls back to a nitration unit 10; the supernatant liquid entering the anaerobic ammonia oxidation denitrification unit 30 is subjected to anaerobic ammonia oxidation denitrification reaction, and ammonia nitrogen and nitrite nitrogen in the supernatant liquid are removed; the clear liquid after passing through the anammox denitrification unit 30 is discharged from a water outlet at the upper part. By the treatment method, the ammonia-containing wastewater sequentially passes through the nitrification unit 10, the precipitation separation unit 20 and the anaerobic ammonia oxidation and denitrification unit 30 to carry out nitrification reaction, sludge-water separation and anaerobic ammonia oxidation and denitrification reaction, so that ammonia nitrogen and total nitrogen are effectively removed.
In this embodiment, the clear solution after passing through the anammox denitrogenation unit 30 is divided into two parts, wherein one part is discharged from a water outlet above the anammox denitrogenation unit 30 as standard treated water, and the other part is returned to the nitrification unit 10 through a return pipe 50 of the return device, and the return ratio R is 50-300%. The reflux is set in such a way that the ammonia nitrogen is always in a relative surplus level in the nitration reaction process, so that part of the treated water is refluxed by the reflux device to continuously remove and reduce the ammonia nitrogen level in the treated water until the treated water reaches the discharge standard.
Similar to the reflux of the reflux device, the concentrated sludge separated by the precipitation separation unit 20 falls back to the nitrification unit 10 through the sludge reflux slit. Specifically, the precipitation separation unit 20 is divided into a clear water zone at the upper part and a sludge zone with the lower part being funnel-shaped, sludge flows back to the nitrification unit 10 along the sludge backflow seam after being concentrated by the sludge hopper, the concentrated sludge in the hunger state is fully contacted and adsorbed with ammonia-containing wastewater, on the one hand, nitrification reaction is facilitated, on the one hand, sludge backflow is realized without a sludge backflow system, and meanwhile sludge deposition is also avoided. The dissolved oxygen in the mixed solution is gradually consumed along with the subsequent nitration reaction in the precipitation process, and the influence of the dissolved oxygen on the subsequent anammox denitrification reaction is reduced.
In this embodiment, when the nitrification unit 10 performs the nitrification reaction, the environmental conditions favorable for the nitrification reaction are formed by controlling parameters such as dissolved oxygen, ph value and flow rate. In particular, preferred parameters of the nitration reaction are: dissolved oxygen DO is 0.3-2.5 mg/L, pH value is 7.8-10, total hydraulic retention time HRT is 2-4 h, biological filler filling rate is 20-30% or mixed solution suspended matter concentration MLSS is 2600-4000 mg/L, nitrite nitrogen in effluent of a nitrification unit 10 is not lower than 10 mg/L. And the proportion range of the ammonia nitrogen and the nitrite nitrogen in the effluent of the nitrification unit 10 is not required to be limited.
In this embodiment, the anammox denitrification unit 30 comprises a plurality of sets of filling composite modules formed by filling composite, the clear water zone is immersed in the upper portion of the precipitation separation unit 20, the clear mixed liquid enters the anammox denitrification unit 30 in the clear water zone for anammox denitrification reaction, and nitrite nitrogen and ammonia nitrogen in the clear water are removed. According to an anaerobic ammonia oxidation biological reaction formula:
NH 4 + +1.32NO 2 － +0.066HCO 3 － +0.13H + →1.02N 2 +0.26NO 3 － +0.066CH 2 O 0.5 N 0.15 +2.03H 2 O
during the anaerobic ammonia oxidation denitrification reaction process, along with the removal of nitrite nitrogen, part of ammonia nitrogen is also removed.
Preferably, the filling rate of the composite filler of each group of filling composite modules is 60-80%, the dissolved oxygen DO is less than or equal to 0.5mg/L, and the total hydraulic retention time HRT is 2-4 h.
Preferably, aiming at the water quality, water quantity change condition and emission standard requirement of the ammonia-containing wastewater, when adjusting each parameter, the dissolved oxygen DO, the reflux ratio R, the water inlet flow and the pH value are adjusted in sequence so as to adapt to the denitrification treatment requirements of different water qualities and water quantities.
Two specific examples are listed below:
example one
In the embodiment, high ammonia nitrogen rare earth ammoniated wastewater is used as raw water, the ammonia nitrogen concentration is 95-110 mg/L, the pH value is 3.2-6.5, and the Chemical Oxygen Demand (COD) is 10-30 mg/L. The control conditions of the integrated device for the anammox denitrification treatment of the ammonia-containing wastewater are as follows: a nitrification unit 10: DO is 0.3-1.2 mg/L, HRT is 2-3 h, and the precipitation separation unit 20: HRT 2h, anammox denitrogenation unit 30: DO is less than or equal to 0.5mg/L, HRT for 3-4 h, and the temperature T is 25-35 ℃.
The ammonia-containing wastewater enters a nitrification unit 10 for nitrification reaction, DO in the nitrification unit 10 is adjusted to be 0.5-0.8 mg/L, pH at 8.0-8.5, HRT is adjusted to be 2.5-3 h, when a reflux ratio R is 0, about (26 +/-3)% of ammonia nitrogen is converted into nitrite nitrogen, and nitrified mixed liquid containing the ammonia nitrogen and the nitrite nitrogen is formed, and the nitrite nitrogen (more than 96%) and partial ammonia nitrogen (about 20%) are removed through the anammox denitrification reaction of an anammox denitrification unit 30. When the R is 50%, about (37 +/-5)% of ammonia nitrogen is converted into nitrite nitrogen, and nitrified mixed liquor containing the ammonia nitrogen and the nitrite nitrogen is formed, and the nitrite nitrogen (more than 94%) and partial ammonia nitrogen (about 38%) are removed through the anaerobic ammonia oxidation denitrification reaction of the anaerobic ammonia oxidation denitrification unit 30. When R is 100%, about (56 +/-3)% of ammonia nitrogen is converted into nitrite nitrogen, and nitrified mixed liquor containing ammonia nitrogen and nitrite nitrogen is formed, and nitrite nitrogen (more than 91%) and partial ammonia nitrogen (about 46%) are removed through the anammox denitrification reaction of the anammox denitrification unit 30. The ammonia nitrogen of the effluent is less than or equal to 12mg/L, and the total nitrogen is less than or equal to 30mg/L, so that the requirements of the discharge standard of rare earth industrial pollutants (GB26451-2011) are met.
Example two
In the embodiment, the high ammonia nitrogen rare earth ammonia-containing wastewater is still used as raw water, the ammonia nitrogen concentration is 95-110 mg/L, the pH value is 3.2-6.5, and the chemical oxygen demand COD is 10-30 mg/L. The control conditions of the integrated device for the anammox denitrification treatment of the ammonia-containing wastewater are as follows: a nitrification unit 10: DO is 0.3-1.2 mg/L, HRT is 2.5-3 h, and the precipitation separation unit 20: HRT 2h, anammox denitrogenation unit 30: DO is less than or equal to 0.5mg/L, HRT for 3-4 h, and the temperature T is 25-35 ℃.
The ammonia-containing wastewater enters a nitrification unit 10 for nitrification reaction, the pH value in the nitrification unit 10 is adjusted to be 8.0-8.5, the R is 75-100%, and the HRT is within the range of 3.5-4 h, when the DO is 0.3-0.5 mg/L, about (38 +/-4)% of ammonia nitrogen is converted into nitrite nitrogen, and nitrified mixed liquid containing the ammonia nitrogen and the nitrite nitrogen is formed, and the nitrite nitrogen (more than 96%) and partial ammonia nitrogen (about 20%) are removed through the anaerobic ammonia oxidation denitrification reaction of an anaerobic ammonia oxidation denitrification unit 30. When DO is 0.5-0.8 mg/L, about (52 +/-5)% of ammonia nitrogen is converted into nitrite nitrogen, and nitrified mixed liquor containing ammonia nitrogen and nitrite nitrogen is formed, and nitrite nitrogen (more than 94%) and partial ammonia nitrogen (about 38%) are removed through the anammox denitrification reaction of the anammox denitrification unit 30. When DO is 0.8-1.2 mg/L, about (64 +/-3)% of ammonia nitrogen is converted into nitrite nitrogen, and nitrified mixed liquor containing ammonia nitrogen and nitrite nitrogen is formed, and nitrite nitrogen (more than 81%) and residual ammonia nitrogen (about 36%) are removed through the anammox denitrification reaction of the anammox denitrification unit 30. The ammonia nitrogen of the effluent is less than or equal to 12mg/L, and the total nitrogen is less than or equal to 30mg/L, so that the requirements of the discharge standard of rare earth industrial pollutants (GB26451-2011) are met.
The device and the method adopt nitrification, precipitation separation and anaerobic ammonia oxidation denitrification to treat the ammonia-containing wastewater, under the conditions of proper DO, pH and HRT, ammonia nitrogen and nitrite nitrogen in the effluent of the nitrification unit 10 DO not need to be strictly controlled within a specific proportion range, the ammonia nitrogen and total nitrogen are effectively removed, the anaerobic ammonia oxidation denitrification reaction belongs to an alkali production reaction, the alkali amount consumed by the front-end nitrification reaction can be supplemented along with the backflow of treated water, and the device and the method have the characteristic of low operation cost. Can effectively relieve the impact load of the quality and the quantity of the ammonia-containing wastewater through adjusting the dissolved oxygen DO, the reflux ratio R, the pH value and the flow, realize the stable operation of a process device, have stronger adaptability to the treatment of the ammonia-containing wastewater with large volatility, and have the advantages of high efficiency, energy conservation, flexible regulation and control and the like.
It should be noted that, a plurality in the above embodiments means at least two.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the problem of low denitrification efficiency of the anaerobic ammonia oxidation process in the prior art is solved;
2. the three treatment functions of nitration reaction, precipitation separation and anaerobic ammonium oxidation denitrification are integrally designed, the proportion of ammonia nitrogen and nitrite nitrogen in the effluent of a nitration unit is not required to be limited, and the effective removal of ammonia nitrogen and total nitrogen is realized;
3. the anaerobic ammonia oxidation denitrification reaction belongs to an alkali production reaction, can supplement the alkali consumption of the front-end nitration reaction along with the backflow of treated water, and has the characteristic of low operation cost;
4. can effectively relieve the impact load of the quality and the quantity of the ammonia-containing wastewater through adjusting the dissolved oxygen DO, the reflux ratio R, the pH value and the flow, realize the stable operation of a process device, have stronger adaptability to the treatment of the ammonia-containing wastewater with large volatility, and have the advantages of high efficiency, energy conservation, flexible regulation and control and the like.
It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides an ammonia wastewater anaerobic ammonia oxidation denitrogenation handles integrated device which characterized in that includes:
a nitrification unit (10), wherein ammonia-containing wastewater is introduced into the nitrification unit (10) for nitrification reaction;
the device comprises a precipitation separation unit (20), a water distribution hole (40) is formed in the nitrification unit (10), the nitrification unit (10) is communicated with the precipitation separation unit (20) through the water distribution hole (40), and mixed liquid after reaction in the nitrification unit (10) enters the precipitation separation unit (20) from the water distribution hole (40) to carry out mud-water separation;
the anaerobic ammonia oxidation and denitrification unit (30) is positioned at the upper part of the precipitation separation unit (20), supernatant obtained by separation in the precipitation separation unit (20) enters the anaerobic ammonia oxidation and denitrification unit (30) to carry out anaerobic ammonia oxidation and denitrification reaction, a water outlet is formed in the upper part of the anaerobic ammonia oxidation and denitrification unit (30), and supernatant obtained after reaction in the anaerobic ammonia oxidation and denitrification unit (30) is discharged from the water outlet;
the nitrification unit (10), the precipitation separation unit (20) and the anaerobic ammonia oxidation denitrification unit (30) are arranged in a reaction device in a centralized manner.
2. The integrated ammonia-containing wastewater anammox denitrification treatment device according to claim 1, wherein the precipitation separation unit (20) is disposed outside the nitrification unit (10), and the water distribution holes (40) are opened at the top side wall of the nitrification unit (10).
3. The integrated ammonia-containing wastewater anammox denitrification treatment device of claim 1, further comprising a reflux device, wherein the reflux device comprises:
the inlet end of the return pipe (50) is positioned on the upper side wall of the anammox denitrification unit (30), the outlet end of the return pipe (50) is positioned in the nitrification unit (10), and part of the supernatant after the anammox denitrification unit (30) reacts flows back into the nitrification unit (10) through the return pipe (50);
the propeller pump is positioned at the inlet end of the return pipe (50) and drives part of clear liquid after the anammox denitrification reaction to enter the return pipe (50), and the height of a water suction port of the propeller pump is lower than that of the water outlet.
4. The integrated device for the anammox-denitrogenation treatment of ammonia-containing wastewater according to claim 1, wherein a sludge return slit is formed at the bottom of the precipitation separation unit (20), and the concentrated sludge after the sludge-water separation falls back to the nitrification unit (10) through the sludge return slit.
5. The integrated ammonia-containing wastewater anammox denitrification treatment device according to claim 1, further comprising:
the bottom of the nitrification unit (10) is provided with a water inlet, the water inlet pipe (60) is communicated with the water inlet and can introduce ammonia-containing wastewater into the nitrification unit (10);
and the water outlet pipe (70) is communicated with the water outlet, and the treated clear liquid is discharged through the water outlet pipe (70).
6. The integrated ammonia-containing wastewater anammox denitrification treatment device according to claim 1, further comprising:
the stirring mechanism (80) extends into the nitrification unit (10), and can stir the liquid in the nitrification unit (10);
an aeration system (90), wherein the aeration system (90) extends into the nitrification unit (10) from the bottom of the nitrification unit (10).
7. The integrated device for the anammox denitrification treatment of ammonia-containing wastewater according to claim 1, wherein the anammox denitrification unit (30) comprises a plurality of groups of filling composite modules composed of filling composites.
8. The ammonia-containing wastewater anammox denitrification treatment method is characterized in that the ammonia-containing wastewater anammox denitrification treatment integrated device comprises a nitrification unit (10), a precipitation separation unit (20) and an anammox denitrification unit (30), and the ammonia-containing wastewater anammox denitrification treatment method comprises the following steps:
the ammonia-containing wastewater enters the nitrification unit (10) for nitrification reaction, and part of ammonia nitrogen in the ammonia-containing wastewater is oxidized into nitrite nitrogen to form a mixed solution simultaneously containing the ammonia nitrogen and the nitrite nitrogen;
the mixed solution after the nitration enters the precipitation separation unit (20) for mud-water separation, the separated supernatant enters the anaerobic ammonia oxidation denitrification unit (30), and the concentrated sludge falls back to the nitration unit (10);
the supernatant entering the anaerobic ammonia oxidation denitrification unit (30) is subjected to anaerobic ammonia oxidation denitrification reaction to remove ammonia nitrogen and nitrite nitrogen in the supernatant;
and the clear liquid after passing through the anaerobic ammonia oxidation denitrification unit (30) is discharged from a water outlet at the upper part.
9. The anammox denitrification process for ammonia-containing wastewater according to claim 8, wherein the clear solution passing through the anammox denitrification unit (30) is divided into two parts, one part is discharged from a water outlet above the anammox denitrification unit (30), the other part is returned to the nitrification unit (10) through a return pipe (50) of a return device, and the return ratio R is 50-300%.
10. The anammox denitrification process for ammonia-containing wastewater according to claim 8, wherein when the nitrification unit (10) performs the nitrification reaction, the parameters of the nitrification reaction are as follows: the Dissolved Oxygen (DO) is 0.3-2.5 mg/L, the pH value is 7.8-10, the total Hydraulic Retention Time (HRT) is 2-4 h, the biological filler filling rate is 20-30% or the mixed solution suspended matter concentration (MLSS) is 2600-4000 mg/L, and the nitrite nitrogen in the effluent of the nitrification unit (10) is not lower than 10 mg/L.
11. The ammonia-containing wastewater anammox denitrification processing method according to claim 8, wherein the anammox denitrification unit (30) comprises a plurality of groups of filling composite modules formed by filling composite, the filling rate of composite filler of each group of filling composite modules is 60-80%, the dissolved oxygen DO is less than or equal to 0.5mg/L, and the total hydraulic retention time HRT is 2-4 h.
12. The method of anammox denitrification treatment for ammonia-containing wastewater according to claim 8, wherein the dissolved oxygen DO, the reflux ratio R, the inflow rate, and the pH value are adjusted in this order.
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