CN112794568A - Sludge-based hydrothermal carbon-reinforced secondary biochemical effluent deep denitrification method and reactor - Google Patents
Sludge-based hydrothermal carbon-reinforced secondary biochemical effluent deep denitrification method and reactor Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
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- 229910052799 carbon Inorganic materials 0.000 claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000945 filler Substances 0.000 claims abstract description 31
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 6
- 239000010842 industrial wastewater Substances 0.000 claims abstract description 5
- 241000894006 Bacteria Species 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
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- 230000002708 enhancing effect Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
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- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
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- 238000011068 loading method Methods 0.000 claims 1
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- 229910002651 NO3 Inorganic materials 0.000 description 3
- 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 description 3
- 239000000126 substance Substances 0.000 description 3
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- 239000002028 Biomass Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000001651 autotrophic effect Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 1
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- 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
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
-
- 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
Abstract
The invention discloses a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method which is characterized in that low C/N secondary biochemical effluent of municipal sewage or industrial wastewater treatment plants enters a reactor filled with sludge-based biochar filler and activated sludge floc, and denitrification is enhanced by the conductivity of the sludge-based biochar filler, so that the utilization of main organic matters and an external carbon source in secondary biochemical effluent by denitrifying bacteria is promoted, and the denitrification efficiency is improved; and the treated water enters a sedimentation tank for sedimentation and then is discharged, part of the precipitated sludge flows back to the sludge-based biochar filler for secondary treatment, and part of the precipitated sludge is discharged as residual sludge. Compared with the conventional denitrification deep bed filter tank for the secondary biochemical effluent deep denitrification, the invention has no problems of filter bed blockage and back flushing, and simultaneously prepares the hydrothermal carbon by using the residual sludge and is used for strengthening the secondary biochemical effluent denitrification, thereby not only reducing the denitrification cost, but also realizing the sludge recycling.
Description
Technical Field
The invention relates to a sludge-based hydrothermal carbon-enhanced secondary biochemical effluent deep denitrification method and a reactor, belonging to the technical field of sewage and wastewater treatment.
Background
The biological denitrification in the sewage treatment process can reduce the total nitrogen entering the water body, thereby controlling the eutrophication of the water body. However, after the traditional nitrification and denitrification, a certain amount of NO still remains in the secondary biochemical effluent of the sewage and wastewater3 -The total nitrogen in the form of-N still risks eutrophication when discharged into water. Deep denitrification is needed for secondary biochemical effluent to meet the water environment protection requirement.
The heterotrophic biological denitrification with added organic carbon source is to remove NO from the secondary biochemical effluent3 --N general methods. However, the extra carbon source not only increases the operation cost, but also may cause the organic substances in the effluent to exceed the standard due to excessive use. In theory, this problem could be solved by autotrophic denitrification with inexpensive inorganic substances such as iron and sulfur in lower valence state as electron donors. Iron-sulfur autotrophic denitrification and anaerobic ammonia oxidation have become the mainstream research direction for efficiently denitrifying sewage with low C/N ratio, but the strain growth rate is slow, the strain is greatly influenced by environmental factors such as water temperature and the like, the problem is a common problem in engineering application, and the problem is more prominent particularly for secondary biochemical effluent with poor nutrition. For the secondary biochemical effluent containing low-concentration nitrogen, how to strengthen and optimize heterotrophic denitrification mainly added with an organic carbon source in engineering practice is still the key point of research and application.
It is worth noting that research on enhanced denitrification of biochar prepared from biomass is carried out at home and abroad for the purpose of recycling waste. The adsorption effect of the biochar has stronger removal effect on nitrogen, but the nitrogen cannot be finally converted into N by adsorption2So that the nitrogen is harmlessly removed and can only be used as a means for capturing and enriching nitrogen in water. The biological denitrification can finally convert nitrogen in the wastewater into N at lower cost2The biochar has obvious effect on strengthening biological denitrification. Excess sludge generated in the sewage treatment process is also a typical biomass, and if biochar prepared from sludge can be used for enhancing denitrification and denitrification of secondary biochemical effluent of a sewage treatment plant, a new idea is provided for recycling sludge and improving the sewage and wastewater effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to use the biochar prepared from the sludge in the secondary biochemical effluent of a sewage treatment plant to strengthen denitrification.
In order to solve the technical problem, the invention provides a sludge-based hydrothermal carbon-enhanced secondary biochemical effluent deep denitrification method, which is characterized by comprising the following steps of:
step 1): the low C/N secondary biochemical effluent of the municipal sewage or industrial wastewater treatment plant enters a reactor filled with sludge-based biochar filler and activated sludge floc, and the denitrification is enhanced through the conductivity of the sludge-based biochar filler, so that the utilization of the main organic matters and the external carbon source in the secondary biochemical effluent by denitrifying bacteria is promoted, and the denitrification efficiency is improved;
step 2): and (2) allowing the water treated in the step 1) to enter a sedimentation tank for sedimentation and then discharging, refluxing part of the precipitated sludge to a sludge-based biochar filler for secondary treatment, and discharging part of the precipitated sludge as residual sludge.
Preferably, the filling density of the sludge-based hydrothermal carbon filler in the step 1) is 10-20 kg/m3The reaction time is 6-15 h, sodium acetate or methanol is used as an external carbon source, and the COD/TN of the inlet water is controlled to be 3.0-3.2.
Preferably, the preparation method of the sludge-based hydrothermal carbon filler in the step 1) comprises the following steps: taking residual sludge of a sewage treatment plant as a raw material, filtering to remove suspended impurities in the sludge, adding water to dilute the filtered sludge, transferring the diluted sludge into a hydrothermal kettle, and sealing; heating the hydrothermal kettle for reaction, naturally cooling to room temperature, carrying out vacuum filtration on a hydrothermal product to obtain a sludge hydrothermal solid product, and washing the product with ethanol and deionized water in sequence; drying, grinding into powder solid, namely hydrothermal carbon, and filling the hydrothermal carbon into a non-woven fabric bag to prepare the sludge-based hydrothermal carbon filler.
More preferably, the filtration is performed with a 100 mesh filter.
More preferably, the dilution is to dilute the sludge MLSS to 1000-3000 mg/L.
More preferably, the temperature of the hydrothermal kettle heating reaction is 220 ℃ and the time is 4 h.
More preferably, the temperature of the drying is 105 ℃ and the time is 2 h.
The invention also provides a sludge-based hydrothermal carbon reinforced secondary biochemical effluent deep denitrification reactor, which is characterized by comprising the following components in parts by weight:
the sludge-based hydrothermal carbon enhanced denitrification reaction tank is provided with a sludge-based biochar filler and activated sludge flocs, and is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe is connected with a carbon source adding pipe;
and a sedimentation tank communicated with the water outlet pipe, wherein a wastewater outlet pipe is arranged on one side of the sedimentation tank, a sludge discharge pipe is arranged at the bottom of the sedimentation tank, the sludge discharge pipe is respectively connected with a sludge return pipe and a sludge discharge pipe, and the sludge return pipe is communicated with the water inlet pipe.
Preferably, a water distribution channel is arranged on one side of a water inlet pipe of the sludge-based hydrothermal carbon enhanced denitrification reaction tank, and a water collecting channel is arranged on one side of a water outlet pipe.
Preferably, a stirrer is arranged in the sludge-based hydrothermal carbon enhanced denitrification reaction tank to keep water in full contact with the sludge-based hydrothermal carbon filler and the activated sludge.
The principle of the invention is as follows: in the sludge-based hydrothermal carbon reinforced secondary biochemical effluent denitrification reactor, the sludge-based hydrothermal carbon filler improves the abundance of denitrifying flora by improving the conductivity of a biological denitrification system, thereby improving the utilization rate of carbon source and the denitrification efficiency.
The invention is applicable to secondary biochemical effluent of municipal sewage treatment plants or industrial wastewater treatment plants, wherein the nitrogen content is NO3 -The sludge-based hydrothermal carbon reinforced secondary biochemical effluent deep denitrification reactor has TN which can stably reach the pollutant discharge standard (first grade A) of urban sewage treatment plants (TN is less than or equal to 15.0 mg/L).
Compared with the traditional denitrification deep bed denitrification filter tank, the sludge-based hydrothermal carbon reinforced secondary biochemical effluent deep denitrification reactor provided by the invention has no problems of filter bed blockage and backwashing, and simultaneously, the hydrothermal carbon prepared from residual sludge is used for reinforcing secondary biochemical effluent denitrification, so that the denitrification efficiency is improved, the denitrification cost is reduced, and the sludge recycling can be realized.
Drawings
FIG. 1 is a schematic view of a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor provided by the invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The invention provides a sludge-based hydrothermal carbon-reinforced secondary biochemical effluent deep denitrification method, which comprises the following steps:
step 1): the low C/N secondary biochemical effluent of the municipal sewage or industrial wastewater treatment plant enters a reactor filled with sludge-based biochar filler and activated sludge floc, and the denitrification is enhanced through the conductivity of the sludge-based biochar filler, so that the utilization of the main organic matters and the external carbon source in the secondary biochemical effluent by denitrifying bacteria is promoted, and the denitrification efficiency is improved;
step 2): and (2) allowing the water treated in the step 1) to enter a sedimentation tank for sedimentation and then discharging, refluxing part of the precipitated sludge to a sludge-based biochar filler for secondary treatment, and discharging part of the precipitated sludge as residual sludge.
The preparation method of the sludge-based hydrothermal carbon filler in the step 1) comprises the following steps: taking residual sludge of a sewage treatment plant as a raw material, filtering by using a 100-mesh filter to remove suspended impurities in the sludge, adding water to dilute the filtered sludge MLSS to 1000-3000 mg/L, transferring the diluted sludge MLSS to a hydrothermal kettle, and sealing; heating the hydrothermal kettle to the temperature of 220 ℃, reacting for 4 hours, naturally cooling to room temperature, carrying out vacuum filtration on a hydrothermal product to obtain a sludge hydrothermal solid product, and washing the product with ethanol and deionized water in sequence; drying at 105 ℃ for 2h, grinding into powdery solid, namely hydrothermal carbon, and filling the hydrothermal carbon into a non-woven fabric bag to prepare the sludge-based hydrothermal carbon filler. The filling density of the sludge-based hydrothermal carbon filler in the reactor is 10-20 kg/m3The reaction time is 6-15 h, sodium acetate or methanol is used as an external carbon source, and the COD/TN of the inlet water is controlled to be 3.0-3.2;
the invention also provides a sludge-based hydrothermal carbon enhanced two-stage biochemical effluent deep denitrification reactor, which comprises a sludge-based hydrothermal carbon enhanced denitrification reaction tank 4 provided with a sludge-based biochar filler 3 and activated sludge flocs 5 and a sedimentation tank 8 communicated with a water outlet pipe 7, wherein the sludge-based hydrothermal carbon enhanced denitrification reaction tank 4 is provided with a water inlet pipe 1 and a water outlet pipe 7, and the water inlet pipe 1 is connected with a carbon source adding pipe 15; one side of the sedimentation tank 8 is provided with a waste water outlet pipe 9, the bottom of the sedimentation tank is provided with a sludge discharge pipe 11, the sludge discharge pipe 11 is respectively connected with a sludge return pipe 14 and a sludge discharge pipe 12, and the sludge return pipe 14 is communicated with the water inlet pipe 1. A water distribution channel 2 is arranged on one side of a water inlet pipe 1 of the sludge-based hydrothermal carbon enhanced denitrification reaction tank 4, and a water collecting channel 6 is arranged on one side of a water outlet pipe 7. A stirrer 13 is arranged in the sludge-based hydrothermal carbon enhanced denitrification reaction tank 4.
Examples
The raw wastewater in the embodiment is from secondary biochemical effluent of a sewage treatment plant in a certain city of Shanghai Songhiang, the Chemical Oxygen Demand (COD) of the raw wastewater and nitrate Nitrogen (NO)3 --N), nitrite Nitrogen (NO)2 --N) and Ammonia Nitrogen (NH)4 +-N) are respectively 20.4 +/-7.3 mg/L, 10.5 +/-0.7 mg/L, 0.02 +/-0.02 mg/L and 0.15 +/-0.3 mg/L, and the nitrogen form in the wastewater is mainly NO3 --N is dominant.
The preparation of the sludge-based hydrothermal carbon takes residual sludge discharged from a secondary sedimentation tank of the sewage treatment plant as a raw material, suspended impurities in the sludge are removed through a 100-mesh filter, water is added to dilute MLSS (Multi-layered suspended solid) of the filtered sludge to 1000-3000 mg/L, and then the MLSS is transferred to a hydrothermal kettle and sealed. Heating the hydrothermal kettle, setting the temperature to 220 ℃, reacting for 4 hours, and naturally cooling to room temperature. And (3) carrying out vacuum filtration on the hydrothermal product to obtain a sludge hydrothermal solid product, and then washing the product with ethanol and deionized water in sequence. Finally, after drying at 105 ℃ for 2h, a dark grey massive hydrothermal charcoal was obtained and ground to a powdery solid. And filling the hydrothermal carbon into a non-woven fabric bag to prepare the sludge-based hydrothermal carbon filler.
Filling a sludge-based hydrothermal carbon filler into a sludge-based hydrothermal carbon enhanced denitrification reactor, allowing secondary biochemical effluent to enter a sludge-based hydrothermal carbon enhanced denitrification reaction tank, controlling COD/TN of the influent to be 3.0-3.2 by taking sodium acetate or methanol as an external carbon source, improving the utilization rate of the carbon source and the denitrification efficiency under the comprehensive action of the sludge-based hydrothermal carbon filler and activated sludge flocs in the reaction tank, and realizing NO3 -Conversion of-N to N2After the reaction is finished, the sludge-water mixed liquid enters a sedimentation tank for sedimentation, and the waste water is discharged after sedimentation; the sludge in the sedimentation tank regularly flows back to the water inlet pipe through the return pipeline, and enters the reaction tank after being mixed with the secondary biochemical effluent to supplement the lost sludge. After treatment, the COD of the wastewater is lower than 15.0mg/L, and the TN is lower than 5.0 mg/L.
The invention relates to a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor, which comprises a sludge-based hydrothermal carbon enhanced denitrification reaction tank 4 and a sedimentation tank 8, and is characterized in that: the sludge-based hydrothermal carbon enhanced denitrification reaction tank is filled with sludge-based hydrothermal carbon fillers 3, a water distribution channel 2 is arranged on the water inlet side of the reaction tank, a water inlet pipe 1 is connected with the water distribution channel and a carbon source feeding pipe 15, a stirrer 13 is arranged at the bottom of the reaction tank, a water collecting channel 6 is arranged on the water outlet side of the reaction tank, and the water collecting channel is connected with a water outlet pipe 7 of the reaction tank; the water outlet pipe 7 of the reaction tank is connected with a sedimentation tank 8, the waste water after the sedimentation tank is discharged through a water outlet pipe 9, a sludge discharge pipe 11 at the bottom of the sedimentation tank is connected with a sludge return pipe 14 and a sludge discharge pipe 12, the returned sludge is returned through the sludge return pipe 14 and mixed with the secondary biochemical effluent in the water inlet pipe 1 and then enters the reaction tank, the residual sludge is discharged through the sludge discharge pipe 12, and the enhanced denitrification process is completed by the sludge-based hydrothermal carbon filler 3 and the activated sludge floc 5 in the reaction tank together.
Claims (10)
1. A sludge-based hydrothermal carbon-enhanced secondary biochemical effluent deep denitrification method is characterized by comprising the following steps:
step 1): the low C/N secondary biochemical effluent of the municipal sewage or industrial wastewater treatment plant enters a reactor filled with sludge-based biochar filler and activated sludge floc, and the denitrification is enhanced through the conductivity of the sludge-based biochar filler, so that the utilization of the main organic matters and the external carbon source in the secondary biochemical effluent by denitrifying bacteria is promoted, and the denitrification efficiency is improved;
step 2): and (2) allowing the water treated in the step 1) to enter a sedimentation tank for sedimentation and then discharging, refluxing part of the precipitated sludge to a sludge-based biochar filler for secondary treatment, and discharging part of the precipitated sludge as residual sludge.
2. The method for enhancing secondary biochemical effluent deep denitrification by using sludge-based hydrothermal carbon as claimed in claim 1, wherein the loading density of the sludge-based hydrothermal carbon filler in the step 1) is 10-20 kg/m3The reaction time is 6-15 h, sodium acetate or methanol is used as an external carbon source, and the COD/TN of the inlet water is controlled to be 3.0-3.2.
3. The method for enhancing the secondary biochemical effluent deep denitrification by using the sludge-based hydrothermal carbon as claimed in claim 1, wherein the preparation method of the sludge-based hydrothermal carbon filler in the step 1) comprises the following steps: taking residual sludge of a sewage treatment plant as a raw material, filtering to remove suspended impurities in the sludge, adding water to dilute the filtered sludge, transferring the diluted sludge into a hydrothermal kettle, and sealing; heating the hydrothermal kettle for reaction, naturally cooling to room temperature, carrying out vacuum filtration on a hydrothermal product to obtain a sludge hydrothermal solid product, and washing the product with ethanol and deionized water in sequence; drying, grinding into powder solid, namely hydrothermal carbon, and filling the hydrothermal carbon into a non-woven fabric bag to prepare the sludge-based hydrothermal carbon filler.
4. The method for enhancing the advanced nitrogen removal of the secondary biochemical effluent by the sludge-based hydrothermal carbon as claimed in claim 3, wherein the filtration is performed by a 100-mesh filter.
5. The method for enhancing the advanced nitrogen removal of secondary biochemical effluent by using the sludge-based hydrothermal carbon as claimed in claim 3, wherein the dilution is to dilute MLSS (Multi-layered suspended solid) sludge to 1000-3000 mg/L.
6. The method for enhancing the secondary biochemical effluent deep denitrification through the sludge-based hydrothermal carbon as claimed in claim 3, wherein the heating reaction temperature of the hydrothermal kettle is 220 ℃ and the heating reaction time is 4 hours.
7. The method for sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification according to claim 3, wherein the drying temperature is 105 ℃ and the drying time is 2 h.
8. A sludge-based hydrothermal carbon reinforced secondary biochemical effluent deep denitrification reactor is characterized by comprising:
the device comprises a sludge-based hydrothermal carbon enhanced denitrification reaction tank (4) provided with a sludge-based biochar filler (3) and activated sludge flocs (5), wherein the sludge-based hydrothermal carbon enhanced denitrification reaction tank (4) is provided with a water inlet pipe (1) and a water outlet pipe (7), and the water inlet pipe (1) is connected with a carbon source adding pipe (15);
the sedimentation tank (8) is communicated with the water outlet pipe (7), a wastewater outlet pipe (9) is arranged on one side of the sedimentation tank (8), a sludge discharge pipe (11) is arranged at the bottom of the sedimentation tank, the sludge discharge pipe (11) is respectively connected with a sludge return pipe (14) and a sludge discharge pipe (12), and the sludge return pipe (14) is communicated with the water inlet pipe (1).
9. The sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor as set forth in claim 8, characterized in that a water distribution channel (2) is arranged on one side of the water inlet pipe (1) of the sludge-based hydrothermal carbon enhanced denitrification reaction tank (4), and a water collection channel (6) is arranged on one side of the water outlet pipe (7).
10. The sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor as set forth in claim 8, characterized in that a stirrer (13) is provided in the sludge-based hydrothermal carbon enhanced denitrification reaction tank (4).
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