CN113666496A - Method and device for realizing deep nitrogen and phosphorus removal of low-carbon-nitrogen-ratio domestic sewage by using segmented water inlet double-short-range anaerobic ammonia oxidation process - Google Patents
Method and device for realizing deep nitrogen and phosphorus removal of low-carbon-nitrogen-ratio domestic sewage by using segmented water inlet double-short-range anaerobic ammonia oxidation process Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 136
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 71
- 230000003647 oxidation Effects 0.000 title claims abstract description 68
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 65
- 239000010865 sewage Substances 0.000 title claims abstract description 64
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 27
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 24
- 239000011574 phosphorus Substances 0.000 title claims abstract description 24
- 241000894006 Bacteria Species 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 238000005273 aeration Methods 0.000 claims description 30
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 20
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 19
- 239000010802 sludge Substances 0.000 claims description 17
- 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
- 239000004912 1,5-cyclooctadiene Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 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
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 4
- 239000000969 carrier Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- PDNNQADNLPRFPG-UHFFFAOYSA-N N.[O] Chemical compound N.[O] PDNNQADNLPRFPG-UHFFFAOYSA-N 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 230000001651 autotrophic effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical group [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012163 sequencing technique Methods 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
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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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/308—Biological phosphorus removal
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- Water Supply & Treatment (AREA)
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Abstract
A method and a device for realizing deep nitrogen and phosphorus removal of low-carbon-nitrogen-ratio domestic sewage by a segmented water inlet double-short-range anaerobic ammonia oxidation process belong to the field of biological sewage treatment. The device comprises a raw water tank for urban domestic sewage, a double-short-distance anaerobic ammonia oxidation reactor and a water outlet tank. The urban domestic sewage enters the integrated reactor in several times and then runs in an anoxic and aerobic mode, the anoxic section generates short-range denitrification coupling anaerobic ammonia oxidation reaction and releases phosphorus, the aerobic section generates synchronous short-range nitrification coupling anaerobic ammonia oxidation reaction and absorbs phosphorus, the biological carrier arranged in the reactor better retains anaerobic ammonia oxidation bacteria, double short-range anaerobic ammonia oxidation is stably realized in the integrated SBR reactor, and deep nitrogen and phosphorus removal is achieved.
Description
Technical Field
The invention relates to a method and a device for realizing deep nitrogen and phosphorus removal of low-carbon-nitrogen-ratio domestic sewage by a segmented water inlet double-short-range anaerobic ammonia oxidation process, belongs to the field of biological sewage treatment, and is suitable for deep nitrogen and phosphorus removal of urban domestic sewage.
Background
The Sequencing Batch Reactor (SBR) is an activated sludge sewage treatment technique that operates in a batch reaction mode. It is mainly characterized by that it is a plug-flow reactor which is completely mixed in space and is ideal in time. The traditional SBR reactor generally adopts nitrification and denitrification processes to treat urban domestic sewage, needs higher aeration quantity and external carbon source to realize deep denitrification, and increases economic energy consumption and residual sludge yield. In order to realize good performance of the SBR reactor in the municipal sewage treatment plant, it is necessary to develop an economical and efficient denitrification process capable of treating domestic sewage with a low carbon-nitrogen ratio.
The anaerobic ammonia oxidation technology is used as a novel autotrophic nitrogen removal technology, ammonia oxygen and nitrite can be directly converted into nitrogen without aeration, and the low-carbon and energy-saving requirements are met. The application of anammox technology is premised on a stable nitrite substrate source, typically by short-cut Nitrification (NH)4 +→NO2 -) And short-cut denitrification (NO)3 -→NO2 -) And (5) realizing. Partial nitrification coupled anaerobic ammonia oxidation (PN/A) is a completely autotrophic nitrogen removal technology, and ammonia nitrogen in part of domestic sewage is partially nitrified into nitrite and then removed with residual ammonia nitrogen through anaerobic ammonia oxidation. Research shows that short-cut nitrification can be realized by controlling low dissolved oxygen, controlling in real time, ensuring ammonia nitrogen residue and other strategies, but Nitrite Oxidizing Bacteria (NOB) cannot be completely inhibited, so that the application of the PN/A process in mainstream urban sewage treatment plants is limited. In recent years, short-cut denitrification has gained increasing attention as another technique for providing nitrite substrates. The short-cut denitrification coupling anaerobic ammonia oxidation (PD/A) technology can realize higher total nitrogen removal rate under the condition of low carbon ratio. The literature indicates that short-cut denitrification has strict requirements on the type of a carbon source and the carbon-nitrogen ratio, so that the research on treating domestic sewage with a complex carbon source is less. Thus, shortcut nitrification and shortcut denitrification technologies have different advantages when coupled with anammox technologies, while still overcoming many difficulties before being generalized for application to mainstream sewage treatment plants.
The double-short-range anaerobic ammonia oxidation is a novel deep denitrification technology which combines PN/A and PD/A technologies and exerts different advantages of the PN/A and the PD/A technologies to the maximum extent. In this process, PD/A can remove the produced nitrate and reduce the inhibition demand for NOB, while PN/A can reduce the external carbon source demand and the aeration energy consumption. In addition, the carbon source is one of the important factors influencing the nitrogen conversion, excessive carbon source can further denitrify the nitrite generated in the short-range denitrification process into nitrogen, meanwhile, the mass propagation of aerobic heterotrophic bacteria can be unfavorable for autotrophic bacteria (AOB and NOB), and too little carbon source can cause that part of nitrate nitrogen can not be removed, thereby deteriorating the total nitrogen removal effect. Therefore, the carbon-nitrogen ratio is properly reduced on the premise of completely removing the nitrate and the nitrogen, which is beneficial to realizing the double-short-range anaerobic ammonia oxidation process, and the step-feed SBR process can pump raw water into the reactor in a fractional manner, so that the gradient reduction of C/N in the reactor is realized, and the requirement of limiting the carbon-nitrogen ratio is met.
Part of municipal domestic sewage is pumped into an anoxic section of an SBR reactor, a PD/A reaction is carried out by utilizing a carbon source in the domestic sewage under an anoxic condition, nitrate and part of ammonia nitrogen in the domestic sewage are synchronously removed, phosphorus is anaerobically released by phosphorus accumulating bacteria, part of synchronous shortcut nitrification anaerobic ammonia oxidation reaction (SPN/A) is carried out under an aerobic condition, part of total nitrogen is removed, the aerobic end is left with the nitrate by adjusting aeration amount, and the phosphorus is aerobically absorbed by the phosphorus accumulating bacteria; and then pumping part of domestic sewage again, performing PD/A reaction by using a carbon source in the domestic sewage under an anoxic condition, performing SPN/A reaction under an aerobic condition, and circulating the steps to finally realize deep nitrogen and phosphorus removal of the mainstream urban domestic sewage.
Disclosure of Invention
The invention aims to provide a method and a device for realizing deep denitrification and dephosphorization of domestic sewage with low carbon-nitrogen ratio by a segmented water inlet double-short-range anaerobic ammonia oxidation process. The main principle of the invention is to create a good generating environment for the anoxic PD/A section by utilizing the characteristic of gradually reducing C/N by stage water inflow, inhibit NOB by utilizing the modes of intermittent aeration and low dissolved oxygen, and create an internal anoxic environment for the aerobic section by adding polyethylene hollow ring packing under the aerobic condition, thereby creating conditions for the aerobic section SPN/A, thereby solving the problem of unstable source of anaerobic ammonia oxidation substrate nitrite in mainstream municipal sewage, and simultaneously deeply denitrifying and dephosphorizing.
The purpose of the invention is realized by the following technical scheme:
the method and the device for treating the sewage with low carbon-nitrogen ratio by the segmented water inlet double-short-range anaerobic ammonia oxidation process comprise a raw water tank (1) of municipal domestic sewage, a double-short-range anaerobic ammonia oxidation reactor (2) and a water outlet tank (3), wherein the aeration and stirring processes are completed by an online monitoring system and a feedback control system;
partial sewage in the raw urban domestic sewage tank (1) enters a double-short-range anaerobic ammonia oxidation reactor (2) through a water inlet pump (1-1); the double-short-range anaerobic ammonia oxidation reactor (2) comprises a pH/DO tester (2-1), a pH/DO probe (2-2), a stirrer (2-3), a biological carrier (2-4), an aeration head (2-5), an aeration pump (2-6) and a drain valve (2-7), and supernatant after sewage precipitation flows into a water outlet tank (3) through the drain valve (2-7).
The method of claim 1, comprising the steps of:
1) starting a double-short-distance anaerobic ammonia oxidation reactor: inoculating return sludge of the municipal sewage treatment plant into the double-short-distance anaerobic ammonia oxidation reactor (2), and maintaining the concentration of suspended sludge at 2000-3000 mg/L; meanwhile, a biological carrier (2-4) is inoculated, the filling ratio is 10% -30%, and the carrier is a blank carrier or a carrier inoculated with anaerobic ammonium oxidation bacteria. The influent water is urban domestic sewage, and the influent water COD: 150-250mg/L, NH4 +-N: 35-60mg/L, and C/N is 3-4; the domestic sewage is pumped into the double-short-distance anaerobic ammonia oxidation reactor (2) for the first timeCarrying out anoxic stirring for 90-120min after water feeding, carrying out aerobic aeration for 60-120min, controlling the dissolved oxygen to be 0.5-1.0mg/L under aerobic conditions, then pumping the domestic sewage into the double-short-distance anaerobic ammonia oxidation reactor (2) again, carrying out anoxic stirring for 90-180min after water feeding, carrying out aerobic aeration for 60-90min, controlling the dissolved oxygen to be 0.5-1.0mg/L under aerobic conditions, enabling the processes of water feeding, anoxic and aerobic to promote a small cycle, and then carrying out the small cycle again, wherein the cycle frequency is 2-4 times, and the cycle is carried out twice, and the water feeding distribution ratio is 2: 1; circulating for three times, wherein the water inlet distribution ratio is 4:2:1, and circulating for four times, wherein the water inlet distribution ratio is 8:4:2: 1; and (3) draining water at the last aerobic final stage of the small circulation to finish a period, wherein the drainage ratio is 50-60%, the sludge age is 20-30d, and the continuous operation is carried out for a plurality of periods. And (3) detecting the changes of ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD at the end of each stage of the double-short-range anaerobic ammonia oxidation reactor (2) in each small cycle every day in a circulating mode, adjusting the circulating times, and if the ammonia nitrogen content is lower than that at the beginning of the anoxic stage when the anoxic stage is finished in the same small cycle and the difference value is more than 5mg/L, proving that the startup of the anoxic stage short-range denitrification coupling anaerobic ammonia oxidation process is successful. If the total nitrogen content (the sum of ammonia nitrogen, nitrite and nitrate nitrogen) is lower than the initial total nitrogen content of the aerobic period in the same small cycle, the difference is more than 5mg/L, and the COD content fluctuation along the process in the aerobic period in the same small cycle is less than 1.5mg/L, the start of the synchronous shortcut nitrification-coupled anaerobic ammonia oxidation process of the aerobic period is successful. The two components exist in the reactor at the same time, so that the successful start-up of the double short-distance anaerobic ammonium oxidation reactor (2) is proved.
2) The process after starting is operated: the influent water is urban domestic sewage, and the influent water COD: 150-250mg/L, NH4 +-N: 35-60mg/L, and C/N is 3-4; the domestic sewage is pumped into a double-short-distance anaerobic ammonia oxidation reactor (2) in times, anoxic stirring is carried out for 90-120min after first water inlet, aerobic aeration is carried out for 60-120min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then the domestic sewage is pumped into the double-short-distance anaerobic ammonia oxidation reactor (2) again, anoxic stirring is carried out for 90-180min after water inlet, aerobic aeration is carried out for 60-90min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then water is fed again to maintain the circulation, the small circulation frequency is carried out for 2-4 times in one period, the circulation is carried out for two times, and the water inlet distribution ratio is 2: 1; circulating three times, distributing waterThe ratio is 4:2:1, the circulation is carried out for four times, and the distribution ratio of water inflow is 8:4:2: 1; and (4) draining water at the last aerobic final stage of water inflow, wherein the water drainage ratio is 50-60%, and the sludge age is 20-30 d. The concentration of the suspended sludge is maintained at 2000-3000 mg/L; the double-short-distance anaerobic ammonia oxidation reactor (2) is internally provided with biological carriers (2-4) with the filling ratio of 10-30%. Multiple periods of continuous operation are carried out, the change of the ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD content of each small-cycle anoxic end and aerobic end of the double-short-distance anaerobic ammonia oxidation reactor (2) is detected for a long time, and the proportion of water inflow for multiple times is adjusted until the ammonia nitrogen in the effluent water<0.5mg/L of nitrite in effluent<0.5mg/L, effluent nitre nitrogen<9.0mg/L phosphorus yielding water<0.1mg/L。
Compared with the traditional nitrification and denitrification process, the method and the device for realizing deep nitrogen and phosphorus removal of the low-carbon-nitrogen-ratio domestic sewage by the segmented water inlet double-short-range anaerobic ammonia oxidation process have the following advantages:
1) synchronous deep denitrification and dephosphorization can be realized without adding an external carbon source, and the operation energy consumption is low;
2) the step-by-step water feeding and gradual reduction of C/N are beneficial to the generation of PD/A reaction in an anoxic section, and the raw water carbon source is fully utilized and saved;
3) the biological carrier is added, the intermittent aeration and the low dissolved oxygen condition are favorable for the generation of the SPN/A reaction in the aerobic section, and the aeration is saved;
4) the dissolved oxygen does not need to be controlled in real time in the operation process, the operation is simple and easy, and the labor cost is saved.
Drawings
FIG. 1 is a schematic structural diagram of a method and a device for realizing deep nitrogen and phosphorus removal of low-carbon-nitrogen-ratio domestic sewage by a segmented water inlet double-short-range anaerobic ammonia oxidation process:
in fig. 1: 1-city domestic sewage raw water tank; 1-a water inlet pump; 2-a double short-range anaerobic ammoxidation reactor; 2-1-pH/DO determinator; 2-pH/DO probe; 2-3-a stirrer; 2-4-fixed polyethylene hollow ring packing; 2-5-aeration head; 2-6-aeration pump; 2-7-a drain valve; and 3, a water outlet tank.
Fig. 2 is a flow chart of real-time control in an embodiment of the present invention.
Detailed Description
The invention is described in detail with reference to the accompanying drawings and examples.
The method and the device for treating the sewage with low carbon-nitrogen ratio by the segmented water inlet double-short-range anaerobic ammonia oxidation process comprise a raw water tank (1) of municipal domestic sewage, a double-short-range anaerobic ammonia oxidation reactor (2) and a water outlet tank (3), wherein the aeration and stirring processes are completed by an online monitoring system and a feedback control system;
partial sewage in the raw urban domestic sewage tank (1) enters a double-short-range anaerobic ammonia oxidation reactor (2) through a water inlet pump (1-1); the double-short-range anaerobic ammonia oxidation reactor (2) comprises a pH/DO tester (2-1), a pH/DO probe (2-2), a stirrer (2-3), a biological carrier (2-4), an aeration head (2-5), an aeration pump (2-6) and a drain valve (2-7), and supernatant after sewage precipitation flows into a water outlet tank (3) through the drain valve (2-7).
The method of claim 1, comprising the steps of:
1) starting a double-short-distance anaerobic ammonia oxidation reactor: inoculating return sludge of the municipal sewage treatment plant into the double-short-distance anaerobic ammonia oxidation reactor (2), and maintaining the concentration of suspended sludge at 2000-3000 mg/L; meanwhile, a biological carrier (2-4) is inoculated, the filling ratio is 10% -30%, and the carrier is a blank carrier or a carrier inoculated with anaerobic ammonium oxidation bacteria. The influent water is urban domestic sewage, and the influent water COD: 150-250mg/L, NH4 +-N: 35-60mg/L, and C/N is 3-4; the domestic sewage is pumped into a double-short-distance anaerobic ammonia oxidation reactor (2) in times, anoxic stirring is carried out for 90-120min after first water inlet, aerobic aeration is carried out for 60-120min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then the domestic sewage is pumped into the double-short-distance anaerobic ammonia oxidation reactor (2) again, anoxic stirring is carried out for 90-180min after water inlet, aerobic aeration is carried out for 60-90min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, a small cycle is formed in the processes of water inlet, anoxic and aerobic treatment, and then the small cycle is carried out again, wherein the cycle frequency is 2-4 times, the cycle is carried out twice, and the water inlet distribution ratio is 2: 1; circulating for three times, wherein the water inlet distribution ratio is 4:2:1, and circulating for four times, wherein the water inlet distribution ratio is 8:4:2: 1; and (3) draining water at the last aerobic final stage of the small circulation to finish a period, wherein the drainage ratio is 50-60%, the sludge age is 20-30d, and the continuous operation is carried out for a plurality of periods. Cyclically detecting every small person every dayAnd (3) adjusting the cycle times according to the change of the ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD content at the end of each stage of the double-short-range anaerobic ammonia oxidation reactor (2) in the cycle, and if the ammonia nitrogen content is lower than the ammonia nitrogen content at the beginning of the anoxic stage when the anoxic stage is finished in the same small cycle and the difference exceeds 5mg/L, the start of the anoxic-stage short-range denitrification coupling anaerobic ammonia oxidation process is proved to be successful. If the total nitrogen content (the sum of ammonia nitrogen, nitrite and nitrate nitrogen) is lower than the initial total nitrogen content of the aerobic period in the same small cycle, the difference is more than 5mg/L, and the COD content fluctuation along the process in the aerobic period in the same small cycle is less than 1.5mg/L, the start of the synchronous shortcut nitrification-coupled anaerobic ammonia oxidation process of the aerobic period is successful. The two components exist in the reactor at the same time, so that the successful start-up of the double short-distance anaerobic ammonium oxidation reactor (2) is proved.
2) The process after starting is operated: the influent water is urban domestic sewage, and the influent water COD: 150-250mg/L, NH4 +-N: 35-60mg/L, and C/N is 3-4; the domestic sewage is pumped into a double-short-distance anaerobic ammonia oxidation reactor (2) in times, anoxic stirring is carried out for 90-120min after first water inlet, aerobic aeration is carried out for 60-120min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then the domestic sewage is pumped into the double-short-distance anaerobic ammonia oxidation reactor (2) again, anoxic stirring is carried out for 90-180min after water inlet, aerobic aeration is carried out for 60-90min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then water is fed again to maintain the circulation, the small circulation frequency is carried out for 2-4 times in one period, the circulation is carried out for two times, and the water inlet distribution ratio is 2: 1; circulating for three times, wherein the water inlet distribution ratio is 4:2:1, and circulating for four times, wherein the water inlet distribution ratio is 8:4:2: 1; and (4) draining water at the last aerobic final stage of water inflow, wherein the water drainage ratio is 50-60%, and the sludge age is 20-30 d. The concentration of the suspended sludge is maintained at 2000-3000 mg/L; the double-short-distance anaerobic ammonia oxidation reactor (2) is internally provided with biological carriers (2-4) with the filling ratio of 10-30%. Multiple periods of continuous operation are carried out, the change of the ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD content of each small-cycle anoxic end and aerobic end of the double-short-distance anaerobic ammonia oxidation reactor (2) is detected for a long time, and the proportion of water inflow for multiple times is adjusted until the ammonia nitrogen in the effluent water<0.5mg/L of nitrite in effluent<0.5mg/L, effluent nitre nitrogen<9.0mg/L phosphorus yielding water<0.1mg/L。
Claims (2)
1. The device for treating sewage with low carbon-nitrogen ratio by using the segmented water inlet double-short-distance anaerobic ammonia oxidation process is characterized in that: the system comprises a raw water tank (1) of urban domestic sewage, a double-short-range anaerobic ammonia oxidation reactor (2) and a water outlet tank (3), wherein the aeration and stirring processes are all completed by an online monitoring system and a feedback control system;
partial sewage in the raw urban domestic sewage tank (1) enters a double-short-range anaerobic ammonia oxidation reactor (2) through a water inlet pump (1-1); the double-short-range anaerobic ammonia oxidation reactor (2) comprises a pH/DO tester (2-1), a pH/DO probe (2-2), a stirrer (2-3), a biological carrier (2-4), an aeration head (2-5), an aeration pump (2-6) and a drain valve (2-7), and supernatant after sewage precipitation flows into a water outlet tank (3) through the drain valve (2-7).
2. Method for applying the device according to claim 1, comprising the steps of:
1) starting a double-short-distance anaerobic ammonia oxidation reactor: inoculating return sludge of the municipal sewage treatment plant into the double-short-distance anaerobic ammonia oxidation reactor (2), and maintaining the concentration of suspended sludge at 2000-3000 mg/L; simultaneously inoculating a biological carrier (2-4) with a filling ratio of 10% -30%, wherein the carrier is a blank carrier or a carrier inoculated with anaerobic ammonium oxidation bacteria; the influent water is urban domestic sewage, and the influent water COD: 150-250mg/L, NH4 +-N: 35-60mg/L, and C/N is 3-4; the domestic sewage is pumped into a double-short-distance anaerobic ammonia oxidation reactor (2) in times, anoxic stirring is carried out for 90-120min after first water inlet, aerobic aeration is carried out for 60-120min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then the domestic sewage is pumped into the double-short-distance anaerobic ammonia oxidation reactor (2) again, anoxic stirring is carried out for 90-180min after water inlet, aerobic aeration is carried out for 60-90min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, a small cycle is formed in the processes of water inlet, anoxic and aerobic treatment, and then the small cycle is carried out again, wherein the cycle frequency is 2-4 times, the cycle is carried out twice, and the water inlet distribution ratio is 2: 1; circulating for three times, wherein the water inlet distribution ratio is 4:2:1, and circulating for four times, wherein the water inlet distribution ratio is 8:4:2: 1; draining water in the last aerobic final stage of the small circulation to finish a period, wherein the drainage ratio is 50-60%, the sludge age is 20-30d, and a plurality of periods are continuously operated; detecting double short-range anaerobes in each small cycle every dayThe ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD content at the end of each stage of the oxygen ammonia oxidation reactor (2) changes, the cycle times are adjusted, if the ammonia nitrogen content is lower than the ammonia nitrogen content at the beginning of the anoxic stage when the anoxic stage is finished in the same small cycle and the difference exceeds 5mg/L, the start of the anoxic stage short-range denitrification coupling anaerobic ammonia oxidation process is proved to be successful; if the total nitrogen content, namely the sum of the ammonia nitrogen, nitrite and nitrate nitrogen contents, is lower than the aerobic initial total nitrogen content when the aerobic stage in the same small cycle is finished, the difference is more than 5mg/L, and the fluctuation of the on-way COD content of the aerobic stage in the same small cycle is less than 1.5mg/L, the start of the synchronous shortcut nitrification-coupled anaerobic ammonia oxidation process of the aerobic stage is successful; if the two substances exist in the reactor at the same time, the success of starting the double-short-distance anaerobic ammonia oxidation reactor (2) is proved;
2) the process after starting is operated: the influent water is urban domestic sewage, and the influent water COD: 150-250mg/L, NH4 +-N: 35-60mg/L, and C/N is 3-4; the domestic sewage is pumped into a double-short-distance anaerobic ammonia oxidation reactor (2) in times, anoxic stirring is carried out for 90-120min after first water inlet, aerobic aeration is carried out for 60-120min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then the domestic sewage is pumped into the double-short-distance anaerobic ammonia oxidation reactor (2) again, anoxic stirring is carried out for 90-180min after water inlet, aerobic aeration is carried out for 60-90min, dissolved oxygen is controlled to be 0.5-1.0mg/L under aerobic conditions, then water is fed again to maintain the circulation, the small circulation frequency is carried out for 2-4 times in one period, the circulation is carried out for two times, and the water inlet distribution ratio is 2: 1; circulating for three times, wherein the water inlet distribution ratio is 4:2:1, and circulating for four times, wherein the water inlet distribution ratio is 8:4:2: 1; draining water at the last aerobic final stage of water inflow, wherein the water drainage ratio is 50-60%, and the sludge age is 20-30 d; the concentration of the suspended sludge is maintained at 2000-3000 mg/L; the double-short-distance anaerobic ammonia oxidation reactor (2) is internally provided with biological carriers (2-4) with the filling ratio of 10-30%; multiple periods of continuous operation are carried out, the change of the ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD content of each small-cycle anoxic end and aerobic end of the double-short-distance anaerobic ammonia oxidation reactor (2) is detected for a long time, and the proportion of water inflow for multiple times is adjusted until the ammonia nitrogen in the effluent water<0.5mg/L of nitrite in effluent<0.5mg/L, effluent nitre nitrogen<9.0mg/L phosphorus yielding water<0.1mg/L。
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