CN116589093A - Debugging method for treating high-nitrogen low-carbon wastewater by SCND device - Google Patents
Debugging method for treating high-nitrogen low-carbon wastewater by SCND device Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 76
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000005273 aeration Methods 0.000 claims abstract description 52
- 239000010802 sludge Substances 0.000 claims abstract description 36
- 239000010865 sewage Substances 0.000 claims abstract description 32
- 239000007921 spray Substances 0.000 claims abstract description 30
- 241001453382 Nitrosomonadales Species 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000001502 supplementing effect Effects 0.000 claims abstract description 7
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 38
- 239000001301 oxygen Substances 0.000 claims description 38
- 229910052760 oxygen Inorganic materials 0.000 claims description 38
- 210000003608 fece Anatomy 0.000 claims description 29
- 239000010871 livestock manure Substances 0.000 claims description 26
- 238000005507 spraying Methods 0.000 claims description 23
- 235000013312 flour Nutrition 0.000 claims description 21
- 230000001877 deodorizing effect Effects 0.000 claims description 16
- 239000003895 organic fertilizer Substances 0.000 claims description 15
- 241000209094 Oryza Species 0.000 claims description 14
- 235000007164 Oryza sativa Nutrition 0.000 claims description 14
- 235000009566 rice Nutrition 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 241000287828 Gallus gallus Species 0.000 claims description 10
- 241000894006 Bacteria Species 0.000 claims description 8
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 241000272525 Anas platyrhynchos Species 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 11
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 9
- 238000004062 sedimentation Methods 0.000 description 7
- 238000004064 recycling Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 244000144972 livestock Species 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 244000144977 poultry Species 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 238000009264 composting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- 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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a debugging method for treating high-nitrogen low-carbon wastewater by an SCND device, belonging to the technical field of sewage treatment; the key points of the technical scheme are as follows: comprises the steps of S1 inoculating dry activated sludge in an SCND device for introducing ammonia oxidizing bacteria; step S2, domesticating and debugging dry activated sludge in the SCND device by controlling a water inlet mode, an aeration mode, a carbon supplementing mode and the like of a plurality of regulation and control stages in the SCND device; according to the invention, ammonia oxidizing bacteria are introduced through the dry activated sludge added in the step S1, and the activated sludge in the SCND device is domesticated and debugged through controlling the water inlet mode, the aeration mode and the carbon source supplementing mode in a plurality of regulation and control stages, so that the SCND device realizes shortcut nitrification and denitrification, the purification capability of the SCND device on high-nitrogen low-carbon wastewater is further enhanced, and the wastewater can be recycled into a spray tower for cyclic spray use.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a debugging method for treating high-nitrogen low-carbon wastewater by an SCND device.
Background
The aerobic composting well realizes the recycling of organic solid wastes, but serious malodorous gas generated in the composting process not only pollutes the environment, but also damages health, which is a key problem to be solved urgently at present and cannot be ignored; malodorous gas generated in the livestock and poultry breeding production process affects the green and healthy development of the breeding industry, wherein the malodorous gas generating source in the livestock and poultry manure recycling process is the largest, and the livestock and poultry manure recycling process is particularly worth focusing on.
The odor source control is a primary link for reducing the odor environmental pollution, the odor-causing chemical substances in the odor can be absorbed in a targeted manner through the external control technology such as a spray tower, the purpose of eliminating the odor can be rapidly realized, but a large amount of high-nitrogen low-carbon spray wastewater can be generated in the spraying process, the purification treatment difficulty is high, and further the spray wastewater is generated and discharged, so that the deodorizing cost is increased; therefore, the treatment of the spray wastewater is considered, and the purified spray wastewater is recycled in a spray tower.
Disclosure of Invention
The invention aims to provide a debugging method for treating high-nitrogen low-carbon wastewater by an SCND device, which aims to solve the problems of the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: comprising the following steps:
s1, inoculating dry activated sludge in an SCND device for introducing ammonia oxidizing bacteria;
s2, arranging a plurality of regulation and control stages, wherein the water inlet mode, the aeration mode and the carbon source supplementing mode of the regulation and control stages are different; the dry activated sludge in the SCND device can be domesticated and debugged through a plurality of regulation and control stages, and then the dry activated sludge is returned to the spray tower for cyclic spraying.
Further, the dry activated sludge can be selected from sludge obtained after filter pressing by a two-stage AO treatment process of the duck raising wastewater.
Further, the regulation and control stage is divided into three stages, namely a stage I, a stage II and a stage III; the stage I is used for maintaining and accelerating the rapid activation of dry activated sludge, the stage II is used for further controlling dissolved oxygen and gradually domesticating ammonia oxidizing bacteria, and the stage III is used for creating low-dissolved oxygen environment conditions to inhibit the growth of nitrite oxidizing bacteria while maintaining the dominant growth of ammonia oxidizing bacteria so as to achieve the effect of short-range nitrification.
Further, the phase I is continuously regulated for 21 days, the phase II is continuously regulated for 21 days, and the phase III is continuously regulated for 70 days.
Further, the spraying wastewater introduced into the organic fertilizer workshop in the anoxic and water inlet area in the stage I is 8-10m 3 /d; controlling the dissolved oxygen content in the sewage to 2-4mg/L through aeration devices of the main biochemical area and the secondary biochemical area, and aerating for 24 hours to maintain the rapid growth of the activated dry activated sludge; and 40-60kg/d of edible flour is added in the main biochemical area.
Further, the spraying wastewater introduced into the organic fertilizer workshop in the anoxic and water inlet area in the stage I is 9m 3 /d; continuously aerating by using aeration devices of the main biochemical area and the secondary biochemical area to control the content of dissolved oxygen in the sewage to 3mg/L; and 50kg/d of edible flour is added in the main biochemical area.
Further, the anoxic and water inlet area in the stage II is filled with spray wastewater of 3-5m in an organic fertilizer workshop 3 /d and 7-11m of deodorizing spray wastewater 3 Mixed sewage of/d; controlling the content of dissolved oxygen in the sewage to 1-3mg/L through aeration devices of the main biochemical area and the secondary biochemical area, and aerating for 24 hours, so as to gradually domesticate ammonia oxidizing bacteria; and adding 20-30kg/d of edible flour and 10 bags of suspended rice hull manure bags in the main biochemical region, and replacing the rice hull manure bags once a week.
Further, the anoxic and water inlet area in the stage II is introduced with the spraying wastewater 4m of the organic fertilizer workshop 3 /d and deodorizing spray wastewater 9m 3 Mixed sewage of/d; continuously aerating through the aeration devices of the main biochemical area and the secondary biochemical area to control the dissolved oxygen content in the sewage to 2mg/L, and adding 25kg/d edible flour into the main biochemical area.
Further, the anoxic and water inlet area in the stage III is filled with deodorizing and spraying wastewater for 10-20m 3 /d; the aeration devices of the main biochemical area and the secondary biochemical area are used for controlling the content of dissolved oxygen in sewage to be 0.5-0.7mg/L, and the intermittent aeration is performed for 40-60min and 10min, so that the device can maintain the dominant growth of ammonia oxidizing bacteria and create low-dissolved oxygen environment conditions to inhibit the growth of nitrite oxidizing bacteria; and adding 20-30kg/d of edible flour and 8-12 bags of suspended fresh chicken manure in the main biochemical region, and replacing the rice hull manure bags once a week.
Further, the anoxic and water inlet area in the stage III is filled with deodorizing spray wastewater 15m 3 /d; the content of dissolved oxygen in sewage is controlled to be 0.6mg/L through continuous intermittent aeration of aeration devices of a main biochemical area and a secondary biochemical area, and the aeration mode is as follows: aeration is carried out for 50min, intermittent aeration is carried out for 10min for 24h, and edible flour 25kg/d and fresh chicken manure bags 10 bags are added in a main biochemical area.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, ammonia oxidizing bacteria are introduced through the dry activated sludge added in the step S1, and the dry activated sludge in the SCND device is domesticated and debugged through controlling a water inlet mode, an aeration mode and a carbon source supplementing mode in a plurality of regulation and control stages, so that the SCND device realizes short-range nitrification and denitrification, the purification capability of the SCND device on high-nitrogen low-carbon wastewater is further enhanced, and the wastewater can be recycled into a spray tower for cyclic spray use.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the flow of wastewater in accordance with the present invention;
FIG. 2 is a graph showing the variation trend of COD, ammonia nitrogen concentration and C/N of the inlet water in the embodiment of the invention;
FIG. 3 is a graph showing the trend of the dissolved oxygen in the SCND device in the embodiment of the invention;
FIG. 4 is a graph showing the SV30 change trend of the dry activated sludge in the SCND device in the embodiment of the invention.
Wherein: 1. an anoxic and water inflow region; 2. a stripping zone; 3. a main biochemical region; 4. a secondary biochemical region; 5. and a pipe chute sedimentation zone.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
Examples: referring to fig. 1-4, a debugging method for treating high nitrogen low carbon wastewater by using an SCND device, wherein the SCND device adopts a common high nitrogen low carbon wastewater device, and the purifying process comprises: step S1, inoculating dry activated sludge subjected to filter pressing by a two-stage AO treatment process of duck raising wastewater in an SCND device, wherein the dry activated sludge is used for introducing ammonia oxidizing bacteria, the adding amount of the dry activated sludge is 2% -5% of the tank volume, and in the embodiment, the adding amount of the dry activated sludge in the step S1 is 3% of the tank volume; s2, a plurality of regulation and control stages are arranged, and a water inlet mode, an aeration mode and a carbon source supplementing mode of the regulation and control stages are providedA formula (I); the water inlet modes can be different in water inlet amount and water inlet type, the aeration modes can be different in aeration amount and intermittent aeration or not, and the carbon source supplementing modes can be different in carbon source type and carbon source amount; the dry activated sludge in the SCND device is domesticated and debugged through a plurality of regulation and control stages, and the C/N value of the synchronous nitrification and denitrification is more than 10 to carry out biological denitrification, and the C content in the introduced wastewater and activated sludge is low, so that a carbon source is required to be added to carry out biological denitrification; compared with the traditional denitrification process using nitrification and denitrification as main denitrification, the short-cut nitrification utilizes the inherent advantages of ammonia oxidizing bacteria on the dynamics characteristic, and the nitrification reaction is controlled to only go on to NO 2 Stage- -N, resulting in a large amount of NO 2 Accumulating- -N and denitrifying bacteria will accumulate NO 2 - -N further oxidation to N 2 The method comprises the steps of carrying out a first treatment on the surface of the Therefore, the SCND device realizes short-cut nitrification and denitrification, thereby enhancing the purification capability of the SCND device on high-nitrogen low-carbon wastewater, and then the wastewater can be recycled into a spray tower for cyclic spray use.
The plurality of regulation and control stages are divided into three stages, namely a stage I, a stage II and a stage III; the stage I is used for maintaining and accelerating the rapid activation of the dry activated sludge, and the stage I is continuously regulated and controlled for 21 days, so that the dry activated sludge is fully activated; and stage II further controls dissolved oxygen and gradually domesticates ammonia oxidizing bacteria, which stage II lasts for 21 days; while the phase III is that the growth of nitrite oxidizing bacteria is inhibited by creating low-dissolved oxygen environment conditions while maintaining the dominant growth of ammonia oxidizing bacteria, so that the effect of short-range nitrification is achieved, and the phase III lasts for 70 days; in addition, the SCND device comprises an anoxic zone 1, a gas stripping zone 2, a main biochemical zone 3, a secondary biochemical zone 4 and an inclined tube sedimentation zone 5; the sewage flows in the stage I, the stage II and the stage III are respectively an anoxic and water inlet region 1, a gas stripping region 2, a main biochemical region 3, a secondary biochemical region 4, an inclined tube sedimentation region 5 and an anoxic and water inlet region 1 or a water outlet pipe, wherein the anoxic and water inlet region 1 is communicated with the bottom of the gas stripping region 2, the gas stripping region 2 is communicated with the top of the main biochemical region 3, sewage is sent from the gas stripping region 2 to the main biochemical region 3 through aeration, the main biochemical region 3 is communicated with the secondary biochemical region 4, a filler frame is arranged in the main biochemical region 3, and combined fiber filler is hung in the filler frame to provide attachment sites for microorganisms; aeration discs are arranged at the bottoms of the main biochemical area 3 and the secondary biochemical area 4, and proper dissolved oxygen is maintained by controlling the aeration time and the operation frequency of an aeration fan; the rice hull manure bag or the chicken manure bag can be hung on the top cross beam of the main biochemical region 3, so that an additional carbon source is provided for the SCND device, the C/N of the high-nitrogen low-carbon wastewater is balanced, and the biodegradability of the wastewater is improved; in addition, the frequency of the aeration fan is controlled, and a common oxygen concentration detection device is arranged, so that the dissolved oxygen concentration of the main biochemical region 3 can be monitored in real time, and the dissolved oxygen control is realized.
Spraying wastewater introduced into an organic fertilizer workshop in the anoxic and water inlet area 1 in the stage I is 8-10m 3 /d; controlling the content of dissolved oxygen in the sewage to 2-4mg/L through aeration devices of the main biochemical region 3 and the secondary biochemical region 4, and aerating for 24 hours to maintain the rapid growth of activated dry activated sludge; and 40-60kg/d of edible flour is added into the main biochemical area 3, in the embodiment, the spraying waste water which is introduced into the organic fertilizer workshop in the anoxic and water inlet area 1 in the stage I is 9m 3 /d; and continuously aerating by using aeration devices of the main biochemical region 3 and the secondary biochemical region 4 to control the content of dissolved oxygen in the sewage to 3mg/L; and 50kg/d of edible flour is added in the main biochemical region 3; wherein the average COD concentration of the spraying wastewater in the organic fertilizer workshop is 58.69mg/L, the average ammonia nitrogen concentration is 140.04mg/L, namely the C/N is 1:2.5; after inoculating dry activated sludge, increasing the aeration quantity of an aeration disc, and blasting dry sludge particles to control the dissolved oxygen in a biochemical area to be 3mg/L, and simultaneously providing enough oxygen for microorganisms to accelerate the activation of microorganisms in the activated sludge; in stage I, the average concentration of feed water in the unit at seven day intervals is shown in Table 1.
Table 1 shows the average inlet water concentration in anoxic and inlet zone 1 during stage I in example 1.
| week | COD(mg/L) | Ammonia nitrogen (mg/L) | C/N |
| 1 | 146.00 | 63.13 | 0.43 |
| 2 | 116.70 | 54.13 | 0.46 |
| 3 | 84.28 | 159.30 | 1.89 |
The anoxic and water inlet area 1 in the stage II is introduced into the spraying wastewater of the organic fertilizer workshop for 3-5m 3 /d and 7-11m of deodorizing spray wastewater 3 Mixed sewage of/d; controlling the content of dissolved oxygen in the sewage to 1-3mg/L through aeration devices of the main biochemical region 3 and the secondary biochemical region 4, and aerating for 24 hours, so as to gradually domesticate ammonia oxidizing bacteria; adding 20-30kg/d of edible flour and 10 bags of suspended rice hull manure bags into the main biochemical region 3, and replacing the rice hull manure bags once a week; in the embodiment, the anoxic and water inlet area 1 in the stage II is introduced into the spraying wastewater 4m of the organic fertilizer workshop 3 /d and deodorizing spray wastewater 9m 3 The mixed sewage of/d (COD concentration in the deodorizing and spraying wastewater is 114.85mg/L, average ammonia nitrogen concentration is 1036.71mg/L, namely C/N is 1 (4.8-17)); continuously aerating through the aeration devices of the main biochemical region 3 and the secondary biochemical region 4 to control the dissolved oxygen content in the sewage to 2mg/L, and adding 25kg/d edible flour into the main biochemical region 3; wherein the feces bag is a plastic woven bag, contains rice hull feces or fresh chicken feces, and is hung in the main biochemical region of the SCND deviceWhen the manure bag is arranged on the beam, the manure bag is immersed in water, soluble substances of rice hull manure or fresh chicken manure in the woven bag can be flushed by water flow to be brought into water, so that the COD content in the SCND device is improved, and the biodegradability of high-nitrogen low-carbon wastewater is enhanced; in stage II, the average concentration of feed water in the unit at seven day intervals is shown in Table 2.
Table 2 shows the average inlet water concentration in zone 1 during stage II of example 1.
| week | COD(mg/L) | Ammonia nitrogen (mg/L) | C/N |
| 1 | 98.30 | 203.10 | 2.07 |
| 2 | 126.11 | 1004.60 | 7.97 |
| 3 | 134.64 | 892.41 | 6.63 |
The anoxic and water inlet area 1 in the stage III is filled with deodorizing and spraying wastewater 10-20m 3 /d; through the main biochemical region3 and the aeration device of the secondary biochemical region 4 controls the content of dissolved oxygen in the sewage to 0.5-0.7mg/L, and the aeration is carried out for 24 hours, so that the device can create low-dissolved oxygen environment conditions to inhibit the growth of nitrite oxidizing bacteria while maintaining the dominant growth of ammonia oxidizing bacteria; and adding 20-30kg/d edible flour and 8-12 bags of suspended fresh chicken manure in the main biochemical region 3, and replacing the rice hull manure bags once a week, in the invention, the anoxic and water inlet region 1 in the stage III is filled with deodorizing spray wastewater 15m 3 /d; the aeration device of the main biochemical area 3 and the secondary biochemical area 4 continuously and intermittently aerates and controls the content of dissolved oxygen in sewage to 0.6mg/L, and the aeration mode is as follows: intermittently aerating for 24h after 50min and 10min, adding 25kg/d edible flour and 10 bags of suspended fresh chicken manure bags into the main biochemical region 3; in stage III, the average concentration of influent water in the unit is shown in table 3 every seven days.
Table 3 shows the average inlet water concentration in zone 1 for example 1 during stage III.
| week | COD(mg/L) | Ammonia nitrogen (mg/L) | C/N |
| 1 | 78.93 | 1034.20 | 13.10 |
| 2 | 75.60 | 750.60 | 9.93 |
| 3 | 107.20 | 1254.20 | 11.70 |
| 4 | 110.64 | 1234.15 | 11.15 |
| 5 | 124.77 | 880.56 | 7.06 |
| 6 | 133.94 | 1277.41 | 9.54 |
| 7 | 173.61 | 1260.79 | 7.26 |
| 8 | 128.53 | 1098.13 | 8.54 |
| 9 | 168.36 | 1610.78 | 9.57 |
| 10 | 135.69 | 1491.41 | 10.99 |
In the invention, the high-nitrogen low-carbon wastewater is the wastewater sprayed by a three-stage spray tower, the initial pH value of the wastewater is less than 9, the pH value in the device can be increased after the wastewater enters an SCND device, and the alkalinity can be consumed in the short-cut nitrification and denitrification process, so that the pH value in the SCND device is required to be maintained within the range of 7.2-7.8 by adding sodium bicarbonate; the pH value in the SCND device can be adjusted by adding sodium bicarbonate, and the actual adding amount depends on the specific water inlet pH values of the stage I, the stage II and the stage III; in addition, the secondary biochemical area 4 is communicated with the bottom of the inclined tube sedimentation area 5, water after biological denitrification is finished flows into the inclined tube sedimentation area 5, upper layer solution in the inclined tube sedimentation area 5 passes through an overflow weir and enters a water outlet pipe to flow out, and the water can be reused for removing sprayed water after biological denitrification, so that sprayed wastewater is formed for recycling; in addition, according to different recycled water amounts in experiments, the method can be used for obtaining the average ammonia removal efficiency of more than 85% for the malodorous gas of the fermentation tank with the average concentration of 3423ppm of the ammonia gas in the spraying process; through the debugging mode, the SCND device can obtain the average ammonia nitrogen removal efficiency of more than 90% for the spray deodorization wastewater with the average ammonia nitrogen concentration of 1189.22mg/L and the average total nitrogen removal efficiency of more than 85% for the spray deodorization wastewater with the average total nitrogen concentration of 1357.70mg/L (data are shown in Table 4), so that the debugging method can purify the spray deodorization wastewater to a higher degree; the bottom of the inclined tube sedimentation zone 5 is communicated with the anoxic and water inlet zone 1, so that each zone in the SCND device forms a closed loop, and the circulating flow of the solution in the SCND device is realized under the action of gas stripping aeration and plug flow of the gas stripping zone 2.
Table 4 shows the average ammonia nitrogen and total nitrogen concentration in zone 1 during stage III of example 1.
Principle of operation
The working mode of the invention comprises the following steps:
s1, inoculating sludge subjected to filter pressing by a two-stage AO treatment process of duck raising wastewater in an SCND device, wherein the sludge is used for introducing ammonia oxidizing bacteria, and the adding amount is 3% of the volume of the pool; then enter a stage I, wherein the spraying wastewater of the anoxic and water inlet area 1 which is introduced into the organic fertilizer workshop is 9m 3 /d; continuously aerating by using aeration devices of the main biochemical region 3 and the secondary biochemical region 4 to control the dissolved oxygen content in the sewage to 3mg/L, and aerating for 24 hours to maintain the rapid growth of the activated sludge; and 50kg/d of edible flour is added in the main biochemical area 3, and after 21 days, the mixture enters a stage II, wherein the anoxic and water inlet area 1 in the stage II is introduced into the spraying wastewater 4m of the organic fertilizer workshop 3 /d and deodorizing spray wastewater 9m 3 Mixed sewage of/d; continuously aerating by using aeration devices of the main biochemical region 3 and the secondary biochemical region 4 to control the dissolved oxygen content in the sewage to 2mg/L, and aerating for 24 hours, thereby gradually domesticating ammonia oxidizing bacteria; adding 25kg/d of edible flour and 10 bags of suspended rice hull manure bags into the main biochemical region 3, and replacing the rice hull manure bags once a week; after lasting 21 days, the wastewater enters a stage III, wherein the anoxic and water inlet area 1 is filled with deodorizing and spraying wastewater for 25m 3 /d; the aeration device of the main biochemical area 3 and the secondary biochemical area 4 continuously and intermittently aerates and controls the content of dissolved oxygen in sewage to 0.6mg/L, and the aeration mode is as follows: intermittent aeration for 50min and 10min is performed for 24h, so that the SCND device can maintain the dominant growth of ammonia oxidizing bacteria and create low-dissolved oxygen environment conditions to inhibit the growth of nitrite oxidizing bacteria; adding 25kg/d of edible flour and 10 bags of hanging fresh chicken manure bags into the main biochemical region 3; therefore, through the debugging method, the SCND device realizes short-range nitrification and denitrification, improves the purification efficiency of the device on high-nitrogen low-carbon wastewater, and recycles the purified water to the spray tower.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "upper," "lower," "left," "right," "front," "back," and the like are used herein for illustrative purposes only.
Claims (10)
1. A debugging method for treating high-nitrogen low-carbon wastewater by an SCND device is characterized by comprising the following steps of:
s1, inoculating dry activated sludge in an SCND device for introducing ammonia oxidizing bacteria;
s2, arranging a plurality of regulation and control stages, wherein the water inlet mode, the aeration mode and the carbon source supplementing mode of the regulation and control stages are different; the dry activated sludge in the SCND device can be domesticated and debugged through a plurality of regulation and control stages, and then the dry activated sludge is returned to the spray tower for cyclic spraying.
2. The debugging method for treating high-nitrogen low-carbon wastewater by using an SCND device according to claim 1, wherein the debugging method comprises the following steps: the dry activated sludge can be selected from sludge obtained by filter pressing of the two-stage AO treatment process of the duck raising wastewater.
3. The debugging method for treating high-nitrogen low-carbon wastewater by using an SCND device according to claim 1, wherein the debugging method comprises the following steps: the regulation and control stage is divided into three stages, namely a stage I, a stage II and a stage III; the stage I is used for maintaining and accelerating the rapid activation of dry activated sludge, the stage II is used for further controlling dissolved oxygen and gradually domesticating ammonia oxidizing bacteria, and the stage III is used for creating low-dissolved oxygen environment conditions to inhibit the growth of nitrite oxidizing bacteria while maintaining the dominant growth of ammonia oxidizing bacteria so as to achieve the effect of short-range nitrification.
4. The debugging method for treating high nitrogen low carbon wastewater by an SCND device according to claim 3, wherein: the phase I is continuously regulated for 21 days, the phase II is continuously regulated for 21 days, and the phase III is continuously regulated for 70 days.
5. The method for treating high nitrogen low carbon wastewater by SCND apparatus as claimed in claim 3The debugging method is characterized in that: the spraying wastewater introduced into the organic fertilizer workshop in the anoxic and water inlet area in the stage I is 8-10m 3 /d; controlling the dissolved oxygen content in the sewage to 2-4mg/L through aeration devices of the main biochemical area and the secondary biochemical area, and aerating for 24 hours to maintain the rapid growth of the activated dry activated sludge; and 40-60kg/d of edible flour is added in the main biochemical area.
6. The debugging method for treating high-nitrogen low-carbon wastewater by an SCND device according to claim 5, wherein: the spraying wastewater introduced into the organic fertilizer workshop in the anoxic and water inlet area in the stage I is 9m 3 /d; continuously aerating by using aeration devices of the main biochemical area and the secondary biochemical area to control the content of dissolved oxygen in the sewage to 3mg/L; and 50kg/d of edible flour is added in the main biochemical area.
7. The debugging method for treating high nitrogen low carbon wastewater by an SCND device according to claim 3, wherein: the anoxic and water inlet area in the stage II is introduced into the spraying wastewater of the organic fertilizer workshop for 3-5m 3 /d and 7-11m of deodorizing spray wastewater 3 Mixed sewage of/d; controlling the content of dissolved oxygen in the sewage to 1-3mg/L through aeration devices of the main biochemical area and the secondary biochemical area, and aerating for 24 hours, so as to gradually domesticate ammonia oxidizing bacteria; and adding 20-30kg/d of edible flour and 10 bags of suspended rice hull manure bags in the main biochemical region, and replacing the rice hull manure bags once a week.
8. The debugging method for treating high nitrogen low carbon wastewater by an SCND device according to claim 7, wherein: spraying wastewater 4m from the anoxic and water inlet area of the stage II to the organic fertilizer workshop 3 /d and deodorizing spray wastewater 9m 3 Mixed sewage of/d; continuously aerating through the aeration devices of the main biochemical area and the secondary biochemical area to control the dissolved oxygen content in the sewage to 2mg/L, and adding 25kg/d edible flour into the main biochemical area.
9. The debugging method for treating high nitrogen low carbon wastewater by SCND apparatus as claimed in claim 3, which comprisesIs characterized in that: the anoxic and water inlet area in the stage III is filled with deodorizing and spraying wastewater 10-20m 3 /d; the aeration devices of the main biochemical area and the secondary biochemical area are used for controlling the content of dissolved oxygen in sewage to be 0.5-0.7mg/L, and the intermittent aeration is performed for 40-60min and 10min, so that the device can maintain the dominant growth of ammonia oxidizing bacteria and create low-dissolved oxygen environment conditions to inhibit the growth of nitrite oxidizing bacteria; and adding 20-30kg/d of edible flour and 8-12 bags of suspended fresh chicken manure in the main biochemical region, and replacing the rice hull manure bags once a week.
10. The debugging method for treating high nitrogen low carbon wastewater by an SCND device according to claim 8, wherein: the anoxic and water inlet area in the stage III is filled with deodorizing spray wastewater 15m 3 /d; the content of dissolved oxygen in sewage is controlled to be 0.6mg/L through continuous intermittent aeration of aeration devices of a main biochemical area and a secondary biochemical area, and the aeration mode is as follows: aeration is carried out for 50min, intermittent aeration is carried out for 10min for 24h, and edible flour 25kg/d and fresh chicken manure bags 10 bags are added in a main biochemical area.
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