Method for improving carbon source utilization efficiency of closed loop flow type anoxic tank

Abstract

The present application relates to sewage treatment technical field, specifically to a kind of method for improving closed loop flow type anoxic tank carbon source utilization efficiency.The present application method establishes the relationship curve of the remaining percentage of available carbon source in anoxic tank with time, and then establishes the relationship curve of carbon source utilization rate with the circulating flow rate in anoxic tank, calculates the relationship between the time when carbon source is fully utilized and the circulating flow rate, and further regulates the operation process, so that the time when carbon source is fully utilized matches the circulating flow rate, thereby ensuring that the carbon source in the anoxic tank is fully utilized;On the one hand, it improves the utilization rate of carbon source, reduces the dosage and cost of carbon source, on the other hand, it also avoids the increase of energy consumption caused by the flow of carbon source into the aerobic tank, which has a positive significance for ensuring stable effluent, resource saving and reducing operating cost.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a method for improving the carbon source utilization efficiency of a closed-loop anoxic tank. Background Technology

[0002] Wastewater generated in production and daily life is generally purified in wastewater treatment plants to achieve water resource recycling; currently, biological methods are commonly used for treatment, such as traditional A 2 The O process and its variations utilize microbial activity to remove and solidify pollutants such as COD, nitrogen, and phosphorus in wastewater, thereby achieving wastewater purification.

[0003] Nitrogen removal typically occurs in an anoxic tank. In this tank, denitrifying bacteria utilize carbon sources to convert nitrate nitrogen into nitrogen gas, thus achieving biological denitrification. To enhance this process, optimization methods such as process control and tank structure optimization are employed. The closed-loop anoxic tank, a type of denitrifying anoxic tank, is a result of this structural optimization. In the closed-loop anoxic tank, raw water mixed with sludge and external return liquid enters the front end of the tank. Carbon sources are added as needed at the front end, and the wastewater flows through a winding corridor to the rear end, where biological denitrification occurs. Part of the wastewater at the rear end goes to the aerobic tank, while another part returns to the front end as an internal circulation. Additionally, the nitrified liquid from the aerobic tank also returns to the front end. Under the action of the flow promoter within the tank, multiple streams of wastewater are thoroughly mixed and treated along the flow direction.

[0004] However, in actual production, it has been found that because the denitrification efficiency of carbon sources requires a certain amount of time to be realized, some carbon sources will flow into the downstream aerobic tank with the water flow. Due to the insufficient utilization of carbon sources, denitrification will be incomplete, which will affect the effluent indicators of the tank. For example, if the nitrate nitrogen concentration is monitored in real time at the end of the tank, the nitrate nitrogen concentration will be too high due to insufficient carbon source utilization. At this time, the system will assume that the insufficient denitrification is caused by insufficient carbon source, and will automatically adjust the amount of carbon source added at the front end of the tank. Over time, the cost of adding extra carbon sources cannot be ignored.

[0005] Therefore, based on the phenomenon of insufficient carbon source utilization in engineering practice, this invention further optimizes the operation of closed-loop anoxic tanks. By adjusting the operating process and screening carbon sources, it ensures stable operation of the process while effectively improving carbon source utilization and reducing carbon source dosage, as well as reducing the aeration energy consumption of the subsequent aerobic tank. This ensures stable effluent on the one hand, saves carbon sources on the other, and reduces operating costs, which has a positive significance for energy conservation and consumption reduction. Summary of the Invention

[0006] The purpose of this invention is to provide a method for improving the carbon source utilization efficiency of a closed-loop anoxic pond, in order to solve the problems of insufficient utilization of carbon source in the pond, partial loss of carbon source, and the need for additional carbon source addition, which leads to increased carbon source consumption and operating costs, thus hindering cost savings and energy conservation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a method for improving the carbon source utilization efficiency of a closed-loop anoxic pond, comprising the following steps: S1. Establish the remaining percentage of usable carbon sources in the anoxic tank. Over time The curve showing the relationship between the changes, namely: ; S2. Establish carbon source utilization rate The curve showing the relationship between time spent in the anoxic tank and the time spent in the anoxic tank is as follows: ; ; ; ; ; , , ; In the formula, For carbon source utilization rate; The time, in hours, is the travel time of the water flow between the inlet and outlet points of the anoxic tank. The length of a single corridor in the anoxic pool is in meters (m). The number of anoxic pool corridors between the inlet point and the outlet point of the anoxic pool. The flow velocity from the inlet point to the outlet point of the anoxic tank, measured by a flow meter, is in m / s. It is the ratio of raw water inflow rate, external return flow rate, and internal return flow rate to the raw water inflow rate; It is the ratio of the circulating flow rate in the anoxic tank to the raw water inflow rate; The time, in hours, required for the water to circulate once in the anoxic pool. The time taken for the water to travel through the circulation corridor in the anoxic pool, expressed in hours (h). The length of the circulation corridor within the anoxic pool is in meters (m). The flow velocity of water in the circulation corridor of the anoxic pool, measured by a flow meter, is in m / s. The time, in hours, is the travel time of the water flow between the return point and the inlet point in the anoxic tank. The flow velocity of water between the reflux point and the inlet point in the anoxic tank, measured by a flow meter, is in m / s. One cycle is recorded as the carbon source circulating from the outlet of the anoxic pool once and then returning to the outlet of the anoxic pool. To remove After a certain period of time, the number of times the carbon source circulates in the anoxic tank is reached. And it is an integer; for Special cases at that time; S3. Based on the calculation in S1, determine the time required for the carbon source to be fully utilized in the anoxic tank, and adjust the operating process to ensure proper water circulation in the anoxic tank after adjustment. The time corresponds to the time required for the carbon source to be fully utilized.

[0008] Furthermore, in S1, the influent to the anoxic tank is taken and an excessive amount of nitrate nitrogen is added to maintain the necessary conditions for denitrification. The content of nitrate nitrogen in the water is monitored in real time until the content of nitrate nitrogen in the water no longer decreases. The total amount of available carbon source is calculated based on the total change in nitrate nitrogen. The real-time consumption of available carbon source was calculated based on the real-time change in nitrate nitrogen. Based on the total amount of available carbon source, the real-time remaining amount and percentage of available carbon source were calculated, and a curve showing the change of the percentage of available carbon source remaining over time was established.

[0009] Furthermore, the influent to the anoxic tank is a mixture of the biological tank influent and the external return liquid, which has undergone anaerobic reaction. The water body at the front end of the anoxic tank is a mixture of aerobic internal return liquid and anoxic internal circulation liquid, and no external carbon source has been added.

[0010] Furthermore, in S2, the necessary conditions for denitrification include sludge concentration, temperature, pH, and dissolved oxygen content; the sludge concentration is 2000~5000 mg / L; the temperature is 12~30℃; the pH is 7.0~7.5; and the dissolved oxygen content is below 0.5 mg / L.

[0011] Furthermore, in S2, the carbon source utilization rate is the proportion of carbon source that can be utilized when the carbon source flows with the water in the anoxic tank for a certain period of time; the proportion of carbon source that can be utilized is the operating rate. Time, and the sum of the proportions of carbon source that can be utilized over several cycles; operation At that time, the proportion of carbon source that can be utilized is that The percentage of carbon source mass utilized over time relative to the total carbon source mass; the percentage of carbon source that can be utilized in each cycle is the percentage of carbon source mass utilized in that cycle relative to the total carbon source mass.

[0012] Furthermore, in S3, a certain percentage of the carbon source remaining is defined as indicating that the carbon source is being fully utilized; the time required to reach this percentage is calculated based on the defined percentage of the carbon source remaining. .

[0013] Furthermore, if the C / N ratio in the influent is relatively high, the operating process can be adjusted to meet flow velocity constraints and... Under the condition of minimizing the value, the adjusted With the time required Correspondingly, if the effluent from the anoxic tank meets the standards, then the influent raw water does not require an external carbon source to meet the process operation requirements.

[0014] Furthermore, if the C / N ratio in the influent is relatively low, the operating process can be adjusted to meet flow velocity constraints and... Under the condition of minimizing the value, the adjusted With the time required If the effluent from the anoxic tank still fails to meet the standards, then an additional carbon source needs to be added to the influent to meet the process operation requirements.

[0015] Furthermore, when adding additional carbon sources, the added carbon sources are screened to identify those that can be fully utilized under the current operating process. A curve showing the change in the remaining percentage of the screened carbon sources over time during the denitrification process is established. First, carbon sources with high denitrification utilization rates are screened, and then further screening is conducted to identify those that can be fully utilized under the current operating conditions. A carbon source whose carbon source utilization rate can reach the defined carbon source utilization rate value; The carbon source denitrification utilization rate is the ratio of the COD equivalent of the carbon source consumed to the actual COD equivalent of the carbon source during the denitrification process.

[0016] Furthermore, the aforementioned control and operation process includes adjusting the operating power or number of submersible jet generators in the anoxic pool. Values ​​and / or value.

[0017] The beneficial effects of this invention are: 1. This invention can effectively avoid the additional carbon source consumption caused by insufficient carbon source utilization in the actual operation of closed-loop anoxic tank, effectively reducing the cost of sewage treatment and having a positive significance for resource conservation. 2. This invention can effectively reduce the amount of carbon source flowing into the subsequent aerobic tank due to insufficient utilization of carbon source in the anoxic section, and has a positive effect on reducing the aeration energy consumption of the aerobic tank. 3. This invention has positive significance in guiding the screening of carbon sources, and can screen out carbon sources that can be fully utilized, which is of positive significance for ensuring the stable operation of sewage treatment and energy conservation and consumption reduction. Attached Figure Description

[0018] Figure 1 This is a process flow diagram of Embodiment 1 of the present invention; Figure 2 This is a diagram showing the layout of the pool in Embodiment 1 of the present invention; Figure 3 This is a graph showing the relationship between the remaining percentage of usable carbon sources in the anoxic tank in the first embodiment of the present invention and time.

[0019] The names corresponding to each mark in the diagram: 1. Pre-anoxic tank; 2. Anaerobic tank; 3. Anoxic tank; 4. Aerobic tank; 5. Post-anoxic tank; 6. Post-aerobic tank. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] Example 1 In this embodiment, a biological treatment process is used to treat urban domestic sewage.

[0022] like Figure 1-2 As shown, urban domestic sewage, after pretreatment (including screens, primary sedimentation tanks, etc.), is fed into pre-anoxic tank 1. In pre-anoxic tank 1, it mixes with external return liquid and then enters anaerobic tank 2. In anaerobic tank 2, after hydrolysis, acidification, and phosphorus release, it enters the front end of anoxic tank 3. In anoxic tank 3, the sewage flows through various meandering corridors to the rear end of anoxic tank 3. Carbon sources are added as needed at the front end of anoxic tank 3, and denitrification is achieved during the sewage flow. At the end of anoxic tank 3, part of the sewage flows to aerobic tank 4, while the rest flows through... The wastewater returns to the front end of the anoxic tank 3 via the internal recirculation corridor. At the same time, part of the nitrified liquid at the end of the aerobic tank 4 is recirculated back to the front end of the anoxic tank 3. After nitrification and phosphorus absorption, the wastewater in the aerobic tank 4, as described above, has part of the nitrified liquid recirculated back to the anoxic tank 3 and the other part discharged. At the rear end of the aerobic tank 4, a post-anoxic tank 5 and a post-aerobic tank 6 are set up in sequence to enhance the treatment. The effluent from the rear end is discharged to the secondary sedimentation tank, where it settles. Part of the sludge is recirculated as the external recirculation liquid mentioned above, and the remaining sludge is discharged. The effluent from the secondary sedimentation tank enters the deep treatment section.

[0023] In this embodiment, the anoxic tank 3 is the closed-loop anoxic tank of the present invention. Eight corridors are provided in the closed-loop anoxic tank. The mixed wastewater from the influent raw water and the external return liquid from the front anaerobic tank 2 enters the anoxic tank 3 from the left side of the first corridor and the second corridor. In the anoxic tank 3, it flows through each corridor in sequence to the right side of the eighth corridor. On the right side of the eighth corridor, some wastewater enters the aerobic tank 4, and some wastewater returns from the internal circulation corridor to the right side of the first corridor. At the same time, the nitrified liquid at the end of the aerobic tank 4 flows back to the right side of the first corridor. Thus, in the anoxic tank 3, the wastewater mixes and flows under the action of the submersible propeller, realizing the denitrification process.

[0024] In this embodiment, a variable frequency submersible thruster is installed in each of the above-mentioned corridors.

[0025] Taking a municipal wastewater treatment plant as an example, a closed-loop anoxic tank is used for denitrification in this wastewater treatment plant, with a designed influent flow rate of 3645.83 m³ / h. 3 / h, the design hydraulic retention time (HRT) of wastewater in the closed-loop anoxic tank is 8h.

[0026] During daily operation, the internal recirculation ratio (the ratio of internal recirculation flow to influent flow) is approximately 300%, the external recirculation ratio (the ratio of external recirculation flow to influent flow) is approximately 60%, and the internal circulation ratio (the ratio of internal circulation flow to influent flow) is approximately 800%. Under normal operating conditions, for a given wastewater treatment plant, since the source of its water volume does not change significantly, the quality of its influent generally does not fluctuate much, providing a factual basis for the research of this invention.

[0027] Table 1. Statistical Table of Average Monthly Raw Water Influent Quality Data of a Wastewater Treatment Plant in 2024

[0028] It can be seen that although the quality of the raw water inlet fluctuates, the fluctuation is not significant. In this embodiment, the raw water inlet is further diluted by external reflux, internal reflux, and self-circulation flow, which further reduces the fluctuation of the quality of the anoxic tank inlet, thus providing a factual basis for the exploration of this invention.

[0029] A mixture of external reflux liquid and anaerobic reaction was taken from the anoxic tank, and the internal reflux liquid and internal circulating liquid were mixed at the front end of the anoxic tank (Note: no additional carbon source was added). The relationship between the remaining percentage of available carbon source and time was investigated in the laboratory.

[0030] Take 10L of influent to the anoxic tank and add excess nitrate nitrogen to maintain the sludge concentration at 2500~3500mg / L; temperature at 25~30℃; pH at 7.0~7.5; and dissolved oxygen content below 0.5mg / L. Use a nitrate nitrogen probe to monitor the nitrate nitrogen content in the water in real time until the nitrate nitrogen content no longer decreases. Calculate the total amount of available carbon source based on the total change in nitrate nitrogen. Calculate the real-time consumption of available carbon source based on the real-time change in nitrate nitrogen (theoretically, removing 1mg of nitrate nitrogen requires 2.87mg of COD). Based on the total amount of available carbon source, calculate the real-time remaining amount and percentage of available carbon source, and establish a curve showing the change in the percentage of available carbon source over time.

[0031] In the formula, The percentage of available carbon sources remaining, % For time, in min.

[0032] The experimental data are as follows: Table 2. Experimental data on the change of the percentage of available carbon source remaining in the influent of the anoxic tank over time.

[0033] Based on the data in the table above, construct a graph showing the change in the percentage of remaining COD content over time, as shown below. Figure 3 As shown, the percentage of residual COD content in the influent carbon source initially decreases rapidly, and then tends to level off.

[0034] The carbon source utilization rate is defined as the proportion of carbon source that can be utilized when it circulates with the water flow in the anoxic tank. The proportion of carbon source that can be utilized is the sum of the utilization proportions of carbon source in each cycle.

[0035] Investigating carbon source utilization The curve showing the relationship between water flow and operating time in the anoxic tank is as follows: ; ; ; ; ; , , ; In the formula, For carbon source utilization rate; The time, in hours, is the travel time of the water flow between the inlet and outlet points of the anoxic tank. The length of a single corridor in the anoxic pool is in meters (m). The number of anoxic pool corridors between the inlet point and the outlet point of the anoxic pool. The flow velocity from the inlet point to the outlet point of the anoxic tank, measured by a flow meter, is in m / s. It is the ratio of raw water inflow rate, external return flow rate, and internal return flow rate to the raw water inflow rate; It is the ratio of the circulating flow rate in the anoxic tank to the raw water inflow rate; The time, in hours, required for the water to circulate once in the anoxic pool. The time taken for the water to travel through the circulation corridor in the anoxic pool, expressed in hours (h). The length of the circulation corridor within the anoxic pool is in meters (m). The flow velocity of water in the circulation corridor of the anoxic pool, measured by a flow meter, is in m / s. The time, in hours, is the travel time of the water flow between the return point and the inlet point in the anoxic tank. The flow velocity of water between the reflux point and the inlet point in the anoxic tank, measured by a flow meter, is in m / s. To remove The number of times the carbon source circulates in the anoxic tank after a certain period of time. The carbon source circulates from the outlet of the anoxic pool for one cycle and then returns to the outlet of the anoxic pool, which is recorded as one cycle.

[0036] In the actual operating conditions of this embodiment, take , .

[0037] Meanwhile, measured by a Doppler current meter, , , According to actual measurements, , .

[0038] Right now , , , .

[0039] Therefore, under these operating conditions,

[0040] Based on Table 2, for The calculation will take time The numerical changes on both sides are considered linear changes, and the value is taken as... The value at time.

[0041] It is evident that only about 65% of the carbon source in the influent is effectively utilized, with a large amount flowing into the downstream aerobic tank. This wastes carbon resources and increases the energy consumption of the aerobic tank. Furthermore, it can be seen that as the number of cycles increases during operation, the impact of higher-order terms in the downstream phases on carbon source utilization is relatively small. Therefore, for the sake of simplified calculations in practical engineering, third-order and higher terms can be discarded, thus affecting carbon source utilization. It can be simplified to:

[0042] Therefore, in order to improve the utilization rate of carbon sources, methods such as screening out suitable carbon sources and regulating the operation of anoxic ponds can be adopted.

[0043] If the operating conditions of the anoxic tank remain unchanged, when screening carbon sources, priority should be given to those that are... Carbon sources with high utilization rates within a given time period.

[0044] If the curve showing the change in the remaining percentage of a certain carbon source over time is known, the submersible thruster can be adjusted to control the flow. , as well as The value of, thus making This is consistent with the fact that the carbon source can be utilized for approximately 90% of the time, as mentioned above, the influent carbon source is utilized for approximately 90% of the time in about 100 minutes, i.e., regulation. It takes about 100 minutes. However, because the biological tank has certain limitations on flow rate, it is difficult to directly achieve this. That is, 100 minutes, so adjust Approximately 100 minutes.

[0045] For example, regulation , , ,at this time , , , .

[0046] at this time: This effectively improves the utilization rate of carbon sources, while also effectively reducing the energy consumption of operating equipment and subsequent aeration.

[0047] It should be noted that the curves showing the change in the remaining percentage of carbon source over time often differ for different carbon sources, and the trends are highly variable. In practical engineering, it is necessary to select an appropriate carbon source and appropriate [other materials] based on the specific carbon source's change curve. Value, such as preferred in A carbon source that can be fully utilized in time, and the number and power of the impellers can be adjusted accordingly, or the time can be adjusted. , The value of is used to optimize the operation of the system.

[0048] This invention is not limited to the preferred embodiments described above. Anyone can derive other forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A method for improving the carbon source utilization efficiency of a closed-loop anoxic pond, characterized in that, Includes the following steps: S1. Establish the remaining percentage of usable carbon sources in the anoxic tank. Over time The curve showing the relationship between the changes, namely: ； S2. Establish carbon source utilization rate The curve showing the relationship between time spent in the anoxic tank and the time spent in the anoxic tank is as follows: ； ； ； ； ； ， ， ； In the formula, For carbon source utilization rate; The time, in hours, is the travel time of the water flow between the inlet and outlet points of the anoxic tank. The length of a single corridor in the anoxic pool is in meters (m). The number of anoxic pool corridors between the inlet point and the outlet point of the anoxic pool. The flow velocity from the inlet point to the outlet point of the anoxic tank, measured by a flow meter, is in m / s. It is the ratio of raw water inflow rate, external return flow rate, and internal return flow rate to the raw water inflow rate; It is the ratio of the circulating flow rate in the anoxic tank to the raw water inflow rate; The time, in hours, required for the water to circulate once in the anoxic pool. The time taken for the water to travel through the circulation corridor in the anoxic pool, expressed in hours (h). The length of the circulation corridor within the anoxic pool is in meters (m). The flow velocity of water in the circulation corridor of the anoxic pool, measured by a flow meter, is in m / s. The time, in hours, is the travel time of the water flow between the return point and the inlet point in the anoxic tank. The flow velocity of water between the reflux point and the inlet point in the anoxic tank, measured by a flow meter, is in m / s. One cycle is recorded as the carbon source circulating from the outlet of the anoxic pool once and then returning to the outlet of the anoxic pool. To remove After a certain period of time, the number of times the carbon source circulates in the anoxic tank is reached. And it is an integer; for Special cases at that time; S3. Based on the calculation in S1, determine the time required for the carbon source to be fully utilized in the anoxic tank, and adjust the operating process to ensure proper water circulation in the anoxic tank after adjustment. The time corresponds to the time required for the carbon source to be fully utilized.

2. The method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 1, characterized in that: In S1, the influent to the anoxic tank is taken and an excessive amount of nitrate nitrogen is added to maintain the necessary conditions for denitrification. The nitrate nitrogen content in the water is monitored in real time until the nitrate nitrogen content in the water no longer decreases. The total amount of available carbon source is calculated based on the total change in nitrate nitrogen. The real-time consumption of available carbon source was calculated based on the real-time change in nitrate nitrogen. Based on the total amount of available carbon source, the real-time remaining amount and percentage of available carbon source were calculated, and a curve showing the change of the percentage of available carbon source remaining over time was established.

3. The method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 2, characterized in that: The anoxic tank influent is a mixture of biological tank influent and external return liquid, which has undergone anaerobic reaction. The anoxic tank front end is a mixture of aerobic internal return liquid and anoxic internal circulation liquid, and no external carbon source is added.

4. The method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 2, characterized in that: In S2, the necessary conditions for denitrification include sludge concentration, temperature, pH and dissolved oxygen content; the sludge concentration is 2000~5000 mg / L; the temperature is 12~30℃; the pH is 7.0~7.5; and the dissolved oxygen content is below 0.5 mg / L.

5. The method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 1, characterized in that: In S2, the carbon source utilization rate is the proportion of carbon source that can be utilized when it flows with water through the anoxic tank for a certain period of time; the proportion of carbon source that can be utilized is the operating rate. The time, and the sum of the proportions of carbon source that can be utilized over several cycles; operation At that time, the proportion of carbon source that can be utilized is that The percentage of carbon source mass utilized over time relative to the total carbon source mass; the percentage of carbon source that can be utilized in each cycle is the percentage of carbon source mass utilized in that cycle relative to the total carbon source mass.

6. The method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 1, characterized in that: In S3, a certain percentage of carbon source remaining is defined as a condition for full utilization of the carbon source; the time required to reach this percentage is calculated based on the defined percentage of carbon source remaining. .

7. A method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 6, characterized in that: If the C / N ratio in the influent is relatively high, the operating process can be adjusted to meet flow velocity constraints and Under the condition of minimizing the value, the adjusted With the time required Correspondingly, if the effluent from the anoxic tank meets the standards, then the influent raw water does not require an external carbon source to meet the process operation requirements.

8. A method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 6, characterized in that: If the C / N ratio in the influent is relatively low, the operating process can be adjusted to meet flow velocity constraints and Under the condition of minimizing the value, the adjusted With the time required If the effluent from the anoxic tank still fails to meet the standards, then an additional carbon source needs to be added to the influent to meet the process operation requirements.

9. A method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to claim 8, characterized in that: When adding additional carbon sources, the added carbon sources are screened to identify those that can be fully utilized under the current operating process. A curve showing the change in the residual percentage of the screened carbon sources over time during the denitrification process is established. First, carbon sources with high denitrification utilization rates are screened, and then further screening is conducted to identify those that can be fully utilized under the current operating conditions. A carbon source whose carbon source utilization rate can reach the defined carbon source utilization rate value; The carbon source denitrification utilization rate is the ratio of the COD equivalent of the carbon source consumed to the actual COD equivalent of the carbon source during the denitrification process.

10. The method for improving the carbon source utilization efficiency of a closed-loop anoxic pond according to any one of claims 1, 6-9, characterized in that: The aforementioned control and operation process includes adjusting the operating power or number of submersible jet generators in the anoxic pool. Values ​​and / or value.

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