CN113003718A - Starting method and application of short-range denitrification system - Google Patents
Starting method and application of short-range denitrification system Download PDFInfo
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Abstract
The invention belongs to the technical field of water treatment, and particularly relates to a starting method of a short-range denitrification system. The starting method of the short-cut denitrification system provided by the invention comprises the following steps of firstly adopting a low nitrogen load matched with a low C: washing the mixed bacteria by N, and matching the optimum C: n enriching nitrite accumulating bacteria under low load, and finally adopting high nitrogen load and optimum C: the N enriches nitrite accumulating bacteria under high load, can enable the reactor to have high-efficiency accumulation capacity of nitrite under different loads, and creates possibility for efficiently treating nitrate wastewater with different concentrations by a nitrite accumulation type short-cut denitrification process.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a starting method and application of a short-range denitrification system.
Background
Anaerobic ammonia oxidation (Anammox) is a novel sustainable biological denitrification technology, does not need aeration and organic carbon, has low sludge yield, and thus has attracted extensive research interest of scholars. Wherein NO2 －The stable acquisition of-N as one of the important substrates of the Anramox reaction is of great significance to the development and application of the Anramox process.
Short-cut denitrification (PD) with nitrite as target product has stable, high-efficiency and simple operation effectThe advantages of simple control and the like are proved to be that NO is provided for the Anammox process2 －N is a very attractive and promising approach. However, the accumulation efficiency of nitrite in PD is strongly influenced by the quality of inlet water and the operation conditions, the content of nitrate in different types of wastewater is greatly different, and the accumulation efficiency of nitrite in PD is unstable.
Previous studies have achieved high nitrite accumulation during PD using specific carbon to nitrogen ratios (C: N) at different nitrogen loadings, and researchers have indicated that the carbon source demand decreases with increasing nitrate concentration in the feed water. Thus in a system capable of achieving efficient accumulation of nitrite, nitrogen load and C: n seems to have some coupling relationship, however this coupling mechanism is not clearly revealed at present, so that it is not possible to propose a reasonable C for PD systems treating actual wastewater containing different nitrates: and N ranges.
Therefore, in order to achieve efficient accumulation of nitrite in different wastewaters, it is necessary to establish the nitrogen load in the PD process with C: and the response adjustment strategy between N has important significance for realizing the high-efficiency accumulation of nitrite in different types of wastewater if a treatment method capable of adapting to wastewater with different nitrogen loads is developed.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the nitrogen load of the wastewater in the prior art can influence the nitrite treatment efficiency of the short-cut denitrification system, thereby providing a starting method and application of the short-cut denitrification system.
Therefore, the invention provides the following technical scheme:
the invention provides a starting method of a short-range denitrification system, which comprises the following steps:
s1, connecting activated sludge in the reactor, introducing waste water with nitrate concentration of 50-80 mgN/L, and operating under the condition that the carbon-nitrogen ratio is 0.6-0.8;
s2, introducing the wastewater with the nitrate concentration of 50-80 mgN/L, and operating under the condition that the carbon-nitrogen ratio is 1.9-2.2;
s3, introducing wastewater with nitrate concentration of 300-500 mgN/L, operating under the condition that the carbon-nitrogen ratio is 1.4-1.7, and finishing the start-up.
Optionally, the step S1 is performed until the nitrite conversion rate is maintained above 90%.
Optionally, the step S2 is performed until the nitrite conversion rate is maintained above 80%.
Optionally, the step S3 is performed until the nitrite conversion rate is maintained above 80%.
Optionally, the sludge is at least one of anoxic tank activated sludge and denitrification sludge.
Optionally, the reactor adopts an operation time sequence of feeding water for 5-15 min, stirring for 15-30 min, precipitating for 20-40 min, and draining for 3-7 min.
Optionally, the drainage ratio is 40-60%.
Optionally, the operation temperature in the steps S1-S3 is 15-25 ℃, the pH is 9-10, and the dissolved oxygen is below 0.5 mg/L.
Optionally, the reactor is a sequencing batch reactor.
The invention also provides application of the starting method of the short-range denitrification system in wastewater treatment.
The technical principle of the invention is that a semi-continuous operation mode is adopted, and low nitrogen load is matched with low C: washing the mixed bacteria by N, and matching the optimum C: n enriching nitrite accumulating bacteria under low load, and finally adopting high nitrogen load and optimum C: the N enriches nitrite accumulating bacteria under high load, can enable the reactor to have high-efficiency accumulation capacity of nitrite under different loads, and creates possibility for efficiently treating nitrate wastewater with different concentrations by a nitrite accumulation type short-cut denitrification process.
The technical scheme of the invention has the following advantages:
the starting method of the short-cut denitrification system provided by the invention comprises the following steps of firstly adopting a low nitrogen load matched with a low C: washing the mixed bacteria by N, and matching the optimum C: n enriching nitrite accumulating bacteria under low load, and finally adopting high nitrogen load and optimum C: the N enriches nitrite accumulating bacteria under high load, can enable the reactor to have high-efficiency accumulation capacity of nitrite under different loads, and creates possibility for efficiently treating nitrate wastewater with different concentrations by a nitrite accumulation type short-cut denitrification process.
The starting method of the short-range denitrification system provided by the invention can further and rapidly accumulate the effect of efficiently accumulating the strains of the nitrite, which can adapt to different nitrogen loads, by limiting the nitrite conversion rate in each step.
The starting method of the short-cut denitrification system provided by the invention has the advantages that the operation time sequence adopted by the reactor is 5-15 min for water inlet, 15-30 min for stirring, 20-40 min for precipitation and 3-7 min for water drainage. The reactor is not provided with an idle period, so that the accumulation performance of nitrite can be further improved, and microorganisms can metabolize to generate Polyhydroxyalkanoate (PHA) through long-time idle period stimulation after water drainage, so that denitrification is more thorough; and when the organic carbon source is deficient, the system can carry out endogenous denitrification reaction, namely, the stored PHA is used as an electron donor for denitrification, but the nitrite accumulation performance is further reduced directly, namely, the idle time stimulates the synthesis of the PHA, so that the nitrite accumulation effect is further reduced.
The starting method of the short-cut denitrification system provided by the invention has the drainage ratio of 40-60%. The operation temperature in the steps S1-S3 is 15-25 ℃, the pH is 9-10, and the dissolved oxygen is below 0.5 mg/L. The reactor is a sequencing batch reactor. Wherein, the drainage ratio ensures the wastewater treatment effect of the reactor and achieves more water treatment; the running conditions ensure that the short-cut denitrification reaction normally carries out the required environmental conditions, and the effect of quickly enriching the short-cut denitrification strains is achieved; the reactor is selected to ensure that the waste water is in a fully mixed state, so that the nitrite is ensured to be accumulated more stably.
The starting method of the short-range denitrification system provided by the invention is applied to wastewater treatment, and has the advantages of comprehensively and continuously running the uninterrupted water inlet reaction in the starting stage, namely, enabling the flora to be always in an excited state of nitrite accumulation, and intermittently running, namely, enabling the flora to be completely mixed in the reactor and fully contacted with a substrate, realizing the rapid enrichment of nitrite accumulation bacteria, and maximizing the wastewater amount and concentration range which can be treated by the reactor; on the basis of keeping the materials in the reactor in a complete mixing reaction, the phenomenon of nitrite accumulation performance deterioration caused by endogenous denitrification in an idle period is avoided, and the high efficiency and the stable performance of the short-range denitrification process are realized; the inoculated activated sludge can be used for realizing the high-efficiency operation of the nitrite accumulation process, and is indirectly beneficial to the reduction and the resource utilization of the excess sludge.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a reactor used in the example of the present invention.
Reference numerals:
1. feeding sodium acetate into a water barrel; 2, a nitrate water inlet barrel; 3. a water pump; 4. a stirrer; 5. a time control switch; a PD-SBR reactor; 7. a drain valve; 8. and (6) discharging the water bucket.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides a wastewater treatment method, which adopts a device shown in figure 1, and comprises a PD-SBR reactor 6, a sodium acetate inlet water tank 1 and a nitrate inlet water tank 2 which are communicated with the PD-SBR reactor 6, a water pump 3 which is used for providing sodium acetate and nitrate into the PD-SBR reactor 6, a stirrer 4 which is also arranged in the PD-SBR reactor 6, and a plurality of time control switches 5 which are used for controlling the specific running time of reaction systems of water inlet and outlet, stirring and the like; the side surface of the PD-SBR reactor 6 is also provided with a drain valve 7 which is communicated with a water outlet barrel 8.
The method comprises the following specific steps: inoculating 7.3L sequencing batch PD-SBR reactor (shown in figure 1) with anoxic tank activated sludge to obtain mixed solution with suspended solid concentration of 5 g.L-1About, using simulated wastewater containing nitrate, sodium acetate, inorganic salt and trace elements as inflow water, operating the reactor under the conditions that the temperature is 20 +/-5 ℃, the pH of the inflow water is 9.5 +/-0.5, the hydraulic retention time is 25-75min, in the embodiment, 25min, the rotating speed is 400 +/-10 rmp, the dissolved oxygen is 0.4mg/L and the idle time is not set, wherein the addition amount of sodium acetate is measured by a COD concentration meter of organic matters in the inflow water, the operation time sequence is 5min of inflow water, stirring is 15min, precipitating is 20min, draining is performed for 3min, and the operation is performed under the conditions that the idle period is not existed and the drainage ratio is 60%.
The simulated wastewater composition was as follows: NaNO3 50～300mgN·L-1Sodium acetate 40-510 mg COD.L-1，KH2PO325mg·L-1,CaCl2 300mg·L-1,MgSO4·7H2O 200mg·L-11 mL. L of trace elements-11 mL. L of trace element II-1The solvent is water.
The trace elements I consist of: EDTA 2Na 6.39 g.L-1,FeSO4·7H2O 5g·L-1。
And the trace element II comprises: EDTA.2 Na 19.11 mg.L-1,H3BO3 0.014mg·L-1,ZnSO4·7H2O 0.43mg·L-1,CoCl2·6H2O 0.24mg·L-1,MnCl2·4H2O 0.99mg·L-1,CuSO4·5H2O 0.25mg·L-1,NiCl2·6H2O 0.19mg·L-1,NaMoO4·2H2O 0.22mg·L-1。
When the mixed bacteria in the system are elutriated under the condition of low C to N, the concentration of the nitrate in the inlet water is 50 mgN.L-1About, the concentration of sodium acetate is 40 mgCOD.L-1About, the content ratio of the influent COD and the nitrate is about 0.8 constantly, the nitrite conversion rate of the reactor is kept above 90 percent when the operation condition is kept for a long time till the 30 th day of the whole starting stage, and the effluent nitrate concentration is 40 mgN.L-1About 10 mgN.L and nitrite accumulation-1And starting to enter a nitrite high-efficiency accumulation stage under the low-load condition.
The concentration of the influent nitrate in the stage is kept at 50 mgN.L-1About, the concentration of sodium acetate is increased to 110 mgCOD.L-1Left and right. The content ratio of the COD and the nitrate in the inlet water is about 2.2 constantly, the operation condition is kept for a long time till the 45 th day of the whole starting stage, the nitrite conversion rate of the reactor is kept above 80 percent, and the nitrate concentration in the outlet water is 5 mgN.L-1About 40 mgN.L and nitrite accumulation-1And starting to enter a nitrite high-efficiency accumulation stage under a high-load condition.
The concentration of the influent nitrate in the stage is kept at 300 mgN.L-1About, the concentration of sodium acetate is increased to 510 mgCOD.L-1Left and right. The content ratio of the COD and the nitrate in the inlet water is about 1.7 constantly, the operation condition is kept for a long time till 60 days, the nitrite conversion rate of the reactor is stable and kept above 80 percent, and the nitrate concentration of the outlet water is 10 mgN.L-1About 240 mgN.L and nitrite accumulation-1The above. The high-efficiency accumulation of nitrite in the PD-SBR reactor under different load conditions is realized, and the start is completed.
After the continuous operation for 60 days, the particle size of the nitrite-accumulating sludge is gradually increased, and the average particle size is increased from 65-75 um at the 1 st day to 95-105 um at the 60 th day. Remarkably improved settling property, SVI3073. + -. 1.2 mL. g from day 1-1SS decreased to 55. + -. 1.2 mL-g on day 60-1And (7) SS. Thus, the invention providesThe semi-continuous starting mode of C: N is adjusted according to the nitrogen load, so that the particle characteristics and the sedimentation performance of the nitrite-accumulated sludge are obviously improved. And starting to enter the stable operation stage of the PD-SBR reactor under the actual high-load wastewater condition.
The nitrate concentration of the wastewater in the stage is kept at 350 mgN.L-1About, simultaneously utilizing sodium acetate to adjust the content ratio of the COD and the nitrate of the inlet water to about 1.6, keeping the operation condition for 3 days, stabilizing the nitrite conversion rate of the reactor and keeping the nitrite conversion rate to be more than 80 percent, and keeping the nitrate concentration of the outlet water to be 10 mgN.L-1About, and the accumulated amount of nitrite is 280 mgN.L-1The above shows that the PD-SBR reactor obtains high-efficiency accumulation of nitrite under the actual high-load wastewater condition. And starting to enter the stable operation stage of the PD-SBR reactor under the actual low-load wastewater condition.
The nitrate concentration of the wastewater in the stage is kept at 60 mgN.L-1About, simultaneously utilizing sodium acetate to adjust the content ratio of the COD and the nitrate of the inlet water to about 2.1, keeping the operation condition for 3 days, stabilizing the nitrite conversion rate of the reactor and keeping the nitrite conversion rate to be more than 80 percent, and keeping the nitrate concentration of the outlet water to be 5 mgN.L-1About 48 mgN.L and nitrite accumulation-1The above shows that the PD-SBR reactor obtains the high-efficiency accumulation of nitrite under the actual low-load wastewater condition. The starting method is proved to be capable of being suitable for the high-efficiency accumulation of nitrite in wastewater with different nitrogen loads.
Example 2
The embodiment provides a wastewater treatment method, which adopts the same equipment as the embodiment 1 and comprises the following specific steps:
inoculating 7.3L effective volume sequencing batch PD-SBR reactor with anoxic tank activated sludge, wherein the suspended solid concentration of the mixed solution is 5 g.L-1About, using simulated wastewater containing nitrate, sodium acetate, inorganic salt and trace elements as inlet water, operating the reactor under the conditions that the temperature is 20 +/-5 ℃, the pH of the inlet water is 9.5 +/-0.5, the hydraulic retention time is 25-75min, in the embodiment, 75min, the rotating speed is 400 +/-10 rmp, the dissolved oxygen is 0.2mg/L, and the idle time is not set, wherein the adding amount of the sodium acetate is equal to that of organic matters in the inlet waterThe COD concentration meter operates under the conditions that the water inflow time sequence is 15min, the stirring time sequence is 30min, the precipitation time sequence is 40min, the water drainage time is 7min, the idle period is not generated, and the water drainage ratio is 40 percent.
The simulated wastewater composition was as follows: NaNO3 80～500mgN·L-148-700 mg of sodium acetate COD.L-1，KH2PO325mg·L-1,CaCl2 300mg·L-1,MgSO4·7H2O 200mg·L-11 mL. L of trace elements-11 mL. L of trace element II-1The solvent is water.
The trace elements I consist of: EDTA 2Na 6.39 g.L-1,FeSO4·7H2O 5g·L-1。
And the trace element II comprises: EDTA.2 Na 19.11 mg.L-1,H3BO3 0.014mg·L-1,ZnSO4·7H2O 0.43mg·L-1,CoCl2·6H2O 0.24mg·L-1,MnCl2·4H2O 0.99mg·L-1,CuSO4·5H2O 0.25mg·L-1,NiCl2·6H2O 0.19mg·L-1,NaMoO4·2H2O 0.22mg·L-1。
When the mixed bacteria in the system are elutriated under the condition of low C to N, the concentration of the nitrate in the inlet water is 80 mgN.L-1About, the concentration of sodium acetate is 48 mgCOD.L-1About, the content ratio of the COD of the inlet water and the nitrate is constantly about 0.6, the operating condition is kept for a long time till the 40 th day of the whole starting stage, the nitrite conversion rate of the reactor is kept above 90 percent, and the concentration of the nitrate in the outlet water is 70 mgN.L-1About 10 mgN.L and nitrite accumulation-1And starting to enter a nitrite high-efficiency accumulation stage under the low-load condition.
The concentration of the influent nitrate in the stage is kept at 80 mgN.L-1About, the concentration of sodium acetate is increased to 150 mgCOD.L-1Left and right. The content ratio of the COD and the nitrate in the inlet water is about 1.9 constantly, the operation condition is kept for a long time till the 60 th day of the whole starting stage, the nitrite conversion rate of the reactor is kept above 80 percent, and the concentration of the nitrate in the outlet water is within the range5mgN·L-1About, and the accumulated amount of nitrite is 65 mgN.L-1And starting to enter a nitrite high-efficiency accumulation stage under a high-load condition.
The concentration of the influent nitrate in the stage is kept at 500 mgN.L-1About, the concentration of sodium acetate is increased to 700 mgCOD.L-1Left and right. The content ratio of the COD and the nitrate in the inlet water is about 1.4 constantly, the operation condition is kept for a long time till 80 days, the nitrite conversion rate of the reactor is stable and kept above 80 percent, and the nitrate concentration of the outlet water is 10 mgN.L-1About, and the accumulated amount of nitrite is 400 mgN.L-1The above. The high-efficiency accumulation of nitrite in the PD-SBR reactor under different load conditions is realized, and the start is completed.
After the start of 80 days, the particle size of the nitrite-accumulating sludge is gradually increased, and the average particle size is increased from 65-75 um on the 1 st day to 100-110 um on the 80 th day. Remarkably improved settling property, SVI3073. + -. 1.2 mL. g from day 1-1SS decreased to 60. + -. 1.2 mL-g on day 80-1And (7) SS. Therefore, by adopting the semi-continuous starting mode for adjusting C to N according to the nitrogen load, the particle characteristics and the settling property of the nitrite-accumulating sludge are obviously improved. And starting to enter the stable operation stage of the PD-SBR reactor under the actual low-load wastewater condition.
The nitrate concentration of the wastewater in the stage is kept at 70 mgN.L-1About, simultaneously utilizing sodium acetate to adjust the content ratio of the COD and the nitrate of the inlet water to about 2.0, keeping the operation condition for 3 days, stabilizing the nitrite conversion rate of the reactor and keeping the nitrite conversion rate to be more than 80 percent, and keeping the nitrate concentration of the outlet water to be 5 mgN.L-1About, and the accumulated amount of nitrite is 56 mgN.L-1The above shows that the PD-SBR reactor obtains the high-efficiency accumulation of nitrite under the actual low-load wastewater condition. And starting to enter the stable operation stage of the PD-SBR reactor under the actual high-load wastewater condition.
The nitrate concentration of the wastewater in the stage is kept at 450 mgN.L-1About, simultaneously utilizing sodium acetate to adjust the content ratio of the COD and the nitrate of the inlet water to about 1.5, keeping the operation condition for 3 days, and ensuring that the conversion rate of the nitrite in the reactor is stable andthe concentration of nitrate in the effluent is kept above 80 percent and the concentration of nitrate in the effluent is 10 mgN.L-1About, and the accumulated amount of nitrite is 360 mgN.L-1The above shows that the PD-SBR reactor achieves high-efficiency accumulation of nitrite under actual high-load wastewater conditions. The starting method is proved to be capable of being suitable for the high-efficiency accumulation of nitrite in wastewater with different nitrogen loads.
Comparative example 1
The comparative example provides a wastewater treatment method, which comprises the following specific steps:
inoculating 7.3L effective volume sequencing batch PD-SBR reactor with anoxic tank activated sludge, wherein the suspended solid concentration of the mixed solution is 5 g.L-1The method comprises the following steps of taking simulated wastewater containing nitrate, sodium acetate, inorganic salt and trace elements as inflow water, operating a reactor under the conditions that the temperature is 20 +/-5 ℃, the pH of the inflow water is 9.5 +/-0.5, the hydraulic retention time is 75min, the rotating speed is 400 +/-10 rmp, the dissolved oxygen is 0.2mg/L, the idle time is 28min, the addition amount of sodium acetate is measured by a COD concentration meter of organic matters in the inflow water, the operation time sequence is 15min, stirring is carried out for 30min, precipitation is carried out for 40min, water drainage is carried out for 7min, and the water drainage ratio is 40%.
The simulated wastewater composition was as follows: NaNO3 60mgN·L-1Sodium acetate 180mg COD.L-1，KH2PO3 25mg·L-1,CaCl2 300mg·L-1,MgSO4·7H2O 200mg·L-11 mL. L of trace elements-11 mL. L of trace element II-1The solvent is water.
The trace elements I consist of: EDTA 2Na 6.39 g.L-1,FeSO4·7H2O 5g·L-1。
And the trace element II comprises: EDTA.2 Na 19.11 mg.L-1,H3BO3 0.014mg·L-1,ZnSO4·7H2O 0.43mg·L-1,CoCl2·6H2O 0.24mg·L-1,MnCl2·4H2O 0.99mg·L-1,CuSO4·5H2O 0.25mg·L-1,NiCl2·6H2O 0.19mg·L-1,NaMoO4·2H2O 0.22mg·L-1。
Starting the PD-SBR reactor under the condition of specific C: N, wherein the concentration of the nitrate of the inlet water is 60 mgN.L-1About, the concentration of sodium acetate is 180 mgCOD.L-1About, the content ratio of the COD and the nitrate in the inlet water is about 3.0 constantly, the operation condition is kept for a long time till the 80 th day of the whole starting stage, the nitrite conversion rate of the reactor is kept about 70 percent, and the nitrate concentration of the outlet water is 5 mgN.L-1About 40 mgN.L and nitrite accumulation-1And about this point, the start-up of the PD-SBR reactor is completed.
After the start of 80 days, the particle size of the nitrite-accumulated sludge is increased, and the average particle size is increased from 65-75 um on the 1 st day to 90-100 um on the 80 th day. Improved settling Properties, SVI3073. + -. 1.2 mL. g from day 1-1SS decreased to 65. + -. 1.2 mL-g on day 80-1And (7) SS. And starting to enter the stable operation stage of the PD-SBR reactor under the actual low-load wastewater condition.
The concentration of the nitrate in the inlet water is kept at 70 mgN.L-1About, simultaneously utilizing sodium acetate to adjust the content ratio of the COD and the nitrate of the inlet water to about 2.0, keeping the operation condition for 3 days, keeping the nitrite conversion rate of the reactor at about 70 percent, and keeping the nitrate concentration of the outlet water at 5 mgN.L-1About 45 mgN.L and nitrite accumulation-1And starting to enter a stable operation stage of the PD-SBR reactor under the actual high-load wastewater condition.
The concentration of the influent nitrate in the stage is kept at 450 mgN.L-1About, simultaneously utilizing sodium acetate to adjust the content ratio of the COD and the nitrate of the inlet water to about 1.5, keeping the operation condition for 3 days, keeping the nitrite conversion rate of the reactor at about 70 percent, and keeping the nitrate concentration of the outlet water at 300 mgN.L-1About 10 mgN.L and nitrite accumulation-1The above. Accumulation of nitrite in PD-SBR reactor under different load conditions is realized.
It can be known from the data of the above examples and comparative examples that the specific starting mode provided by the invention can enable the reactor to have high-efficiency accumulation capacity of nitrite under different loads, and enable the nitrate accumulation type short-cut denitrification process to efficiently treat nitrate wastewater with different concentrations.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A starting method of a short-range denitrification system is characterized by comprising the following steps:
s1, connecting activated sludge in the reactor, introducing waste water with nitrate concentration of 50-80 mgN/L, and operating under the condition that the carbon-nitrogen ratio is 0.6-0.8;
s2, introducing the wastewater with the nitrate concentration of 50-80 mgN/L, and operating under the condition that the carbon-nitrogen ratio is 1.9-2.2;
s3, introducing wastewater with nitrate concentration of 300-500 mgN/L, operating under the condition that the carbon-nitrogen ratio is 1.4-1.7, and finishing the start-up.
2. The method for starting up a short-cut denitrification system according to claim 1, wherein said step S1 is performed until the nitrite conversion rate is maintained above 90%.
3. The method for starting up a short-cut denitrification system according to claim 1, wherein said step S2 is performed until nitrite conversion rate is maintained above 80%.
4. The method for starting up a short-cut denitrification system according to claim 1, wherein said step S3 is performed until nitrite conversion rate is maintained above 80%.
5. The method for starting up a short-cut denitrification system according to any one of claims 1 to 4, wherein the sludge is at least one of anoxic tank activated sludge and denitrification sludge.
6. The method for starting up a short-cut denitrification system according to any one of claims 1 to 5, wherein the reactor is operated in the sequence of water feeding for 5 to 15min, stirring for 15 to 30min, settling for 20 to 40min and draining for 3 to 7 min.
7. The method for starting up a short-cut denitrification system according to claim 6, wherein the drain ratio is 40-60%.
8. The start-up method of the shortcut denitrification system of any one of claims 1 to 7, wherein the operation temperature in steps S1 to S3 is 15 to 25 ℃, the pH is 9 to 10, and the dissolved oxygen is 0.5mg/L or less.
9. The method of starting up a short-cut denitrification system as set forth in claim 8, wherein the reactor is a sequencing batch reactor.
10. Use of a method of starting up a short-cut denitrification system as claimed in any one of claims 1 to 9 in wastewater treatment.
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| CN113603210A (en) * | 2021-08-12 | 2021-11-05 | 国河环境研究院(南京)有限公司 | Domestication method of high-density short-cut denitrification granular sludge |
| CN115367869A (en) * | 2022-08-22 | 2022-11-22 | 华南农业大学 | Method for stably accumulating nitrite nitrogen in short-range denitrification based on mixed nutrition |
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| CN115367869B (en) * | 2022-08-22 | 2024-04-12 | 华南农业大学 | Method for stably accumulating nitrite nitrogen in short-cut denitrification based on mixed nutrition |
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