High-load low-carbon sewage biological treatment process and device

Abstract

The invention discloses a high-load low-carbon sewage biological treatment process and device, and relates to the technical field of sewage treatment. According to the process, a process route combining anaerobic treatment, biological selection, biological enhancement and efficient aerobic treatment is adopted, aeration and an intelligent control system are integrated, and high-load and low-energy-consumption sewage treatment reaches the standard. The high-load low-carbon biological sewage treatment equipment comprises an anaerobic unit, a biological selection unit, a biological enhancement unit, a high-efficiency aerobic unit and a precipitation unit which are sequentially connected, the biological selection unit, the biological enhancement unit and the high-efficiency aerobic unit are integrally designed, and water flows of the units are sequentially connected in an overflow manner; the biological selection unit is provided with a first sludge pipe, a screening agent pipe and a mixing guide plate. The system disclosed by the invention can remarkably improve the treatment load of the system, improve the oxygen utilization rate, reduce the occupied area of the system, reduce the sludge yield and the overall operation cost, and is suitable for efficient low-carbon treatment and upgrading and reconstruction of newly-built urban sewage and industrial wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a high-load low-carbon sewage biological treatment process and an integrated device, which is suitable for efficient low-carbon treatment and upgrading and reconstruction of newly-built municipal sewage and industrial wastewater. BACKGROUND

[0002] As an important environmental protection infrastructure, sewage treatment is also a large energy consumer, with its power consumption accounting for about 2% of the total social power consumption, and has great potential for energy saving and carbon reduction.

[0003] At present, although the traditional activated sludge method and its derived processes (such as A / O, A² / O) are mature in pollutant removal, they face severe challenges in sustainability and economy, mainly in the following three aspects:

[0004] 1. Conflict between treatment load and land occupation. The biochemical system generally has a low treatment load, resulting in a large volume of structures and a large land occupation, which restricts the new construction or expansion projects in areas with limited land.

[0005] 2. Serious energy waste. The aeration system is the core of energy consumption in sewage treatment plants. The traditional aeration method is inefficient and controlled in a rough way, and cannot accurately adjust the aeration amount according to the real-time changes of water quality and quantity, resulting in low energy utilization efficiency.

[0006] 3. Large sludge production and high disposal cost. The sludge production rate of traditional processes is high, and the subsequent sludge treatment and disposal cost is high, which also brings secondary environmental risks.

[0007] These limitations make it difficult for existing technologies to meet the current comprehensive requirements of "high efficiency, energy saving, cost reduction and pollution reduction" for sewage treatment systems. Therefore, there is an urgent need for an innovative technology and integrated equipment that can solve the problems of high load, low energy consumption and less sludge. SUMMARY

[0008] Based on the company's core technology, the present application aims to overcome the shortcomings of the prior art and provide a high-load low-carbon sewage biological treatment process and device. The process route combines anaerobic treatment, biological selection, biological reinforcement and high-efficiency aerobic phase combination, and integrates aeration and intelligent control system, which can significantly improve the treatment load of the sewage treatment system, improve oxygen utilization rate, reduce system land occupation, reduce sludge production and overall operating cost.

[0009] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0010] The application discloses a high-load and low-carbon sewage biological treatment process, which adopts an anaerobic treatment, biological selection, biological strengthening and high-efficiency aerobic phase combined process route, and integrates an intelligent control system to realize high-load and low-carbon operation of a sewage biological treatment system.

[0011] S1, sewage enters an anaerobic unit, is fully mixed with backflow sludge and backflow mixed liquid under the action of a stirrer and degrades part of organic matters;

[0012] S2, backflow sludge of a sedimentation unit and a screening agent enter a biological selection unit together, under controllable conditions, specific microbial flora with high-efficiency decomposition ability for pollutants are screened;

[0013] S3, effluent of step S2 is caused to flow into a biological strengthening unit, under the conditions of a temperature of 25-30 DEG C and dissolved oxygen of 4.0-5.0 mg / L, microbial strengthening is carried out, high concentration and high activity of microbial flora are realized;

[0014] S4, effluent of step S1 and effluent of step S3 are caused to enter a high-efficiency aerobic unit together, through a high-efficiency aeration system, dissolved oxygen is accurately controlled at 3.0+ / -0.5 mg / L, high-efficiency removal of organic matters is realized, the unit has high oxygen utilization rate, energy consumption is reduced by more than 40% compared with a traditional aeration system, and the treatment load is increased by more than 10%;

[0015] S5, part of the mixed liquid at the end of the high-efficiency aerobic unit is backflowed to the anaerobic unit to strengthen denitrification, the remaining part is caused to enter a sedimentation unit to realize separation of sludge and water, separated sludge is partially backflowed to the anaerobic unit, partially backflowed to the biological selection unit and discharged out of the system;

[0016] S6, the whole process is monitored and optimized by the intelligent control system in real time, and high-load and low-carbon operation of the system is realized.

[0017] The application discloses a high-load and low-carbon sewage biological treatment device, which comprises an anaerobic unit, a biological selection unit, a biological strengthening unit, a high-efficiency aerobic unit and a sedimentation unit which are connected in sequence, and a matched aeration and intelligent control system, the biological selection unit, the biological strengthening unit and the high-efficiency aerobic unit are designed in an integrated mode, and water flows of the units are connected in sequence through overflow connection, the biological selection unit is provided with a first sludge pipe, a screening agent pipe and a mixed guide plate, the biological strengthening unit is provided with a first adjusting valve, a first air pipe, a first high-efficiency aeration equipment, a heating device, an online temperature monitoring instrument and a first online dissolved oxygen instrument, the high-efficiency aerobic unit is provided with a second adjusting valve, a second air pipe, a second high-efficiency aeration equipment, a backflow pipe, a third adjusting valve, a third air pipe, a second online dissolved oxygen instrument and an online sludge concentration meter, and the intelligent control system is internally provided with an AI algorithm module.

[0018] Preferably, the biological selection unit and the biological enhancement unit are located within the high-efficiency aerobic unit, and the wastewater between each unit is connected through a flow hole and an overflow hole. The overflow hole of the biological enhancement unit is higher than the working liquid level of the high-efficiency aerobic unit.

[0019] Preferably, the guide plates in the biological selection unit are arranged sequentially along the water flow direction, and the screening agent is a composite compound rich in amino acids and various trace elements.

[0020] Preferably, both the bio-enhanced unit and the high-efficiency aerobic unit are equipped with high-efficiency aeration equipment with an oxygen transfer efficiency of not less than 60% and online maintenance and anti-clogging functions. The high-efficiency aeration equipment is interlocked with the online dissolved oxygen meter through the regulating valve on the aeration pipeline to achieve precise control of the dissolved oxygen concentration of each unit.

[0021] Preferably, the biological selection unit is provided with a first sludge return pipe connected to the sedimentation unit, the high-efficiency aerobic unit is provided with a return pipe connected to the anaerobic unit, and the sedimentation unit is provided with a second sludge return pipe connected to the anaerobic unit.

[0022] Preferably, the intelligent control system has a built-in AI algorithm module that can predict operating parameters based on historical and real-time data, achieve precise aeration and process optimization, shorten the control response time, and achieve the goal of energy saving and consumption reduction.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. High efficiency: Through biological selection and enhancement, highly efficient bacterial communities are enriched, significantly improving the treatment load per unit tank volume.

[0025] 2. Low energy consumption: It adopts high-efficiency aeration and AI intelligent control to achieve on-demand aeration, which greatly reduces the power consumption of operation.

[0026] 3. Less sludge: The unique microbial community structure and process conditions help reduce sludge production and disposal costs.

[0027] 4. Intelligent: It has predictive and self-optimization capabilities, enhancing system stability and resistance to shock loads.

[0028] 5. Integration: Modular integrated design, small footprint, easy system expansion and installation. Attached Figure Description

[0029] Figure 1 The process flow diagram of this invention;

[0030] Figure 2 A schematic diagram of the structure of the present invention.

[0031] In the diagram: 1. Anaerobic unit; 11. Inlet pipe; 12. Agitator; 13. First overflow orifice; 14. Second sludge pipe; 2. Biological selection unit; 21. First sludge pipe; 22. Screening agent dosing pipe; 23. Mixing guide plate; 24. Second overflow orifice; 3. Bio-enhancing unit; 31. Heating device; 32. First regulating valve; 33. First air pipe; 34. First high-efficiency aeration device; 35. First overflow orifice; 36. Online temperature instrument; 37. First online dissolved oxygen meter; 4. 41. High-efficiency aerobic unit; 42. Second regulating valve; 43. Second air pipe; 44. Second high-efficiency aeration equipment; 45. Third regulating valve; 46. Third air pipe; 47. Return pipe; 48. Second overflow hole; 49. First online dissolved oxygen meter; 50. Online sludge concentration meter; 51. Sedimentation unit; 52. Water outlet pipe; 53. Sludge discharge pipe; 54. Sludge return pipe; 55. First flow meter; 56. Second flow meter; 57. Return pump; 6. Aeration equipment; 7. Intelligent control system. Detailed Implementation

[0032] Example 1

[0033] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0034] See Figure 1 and Figure 2 This embodiment provides a high-load, low-carbon wastewater biological treatment system device, including an anaerobic unit 1, a biological selection unit 2, a biological enhancement unit 3, a high-efficiency aerobic unit 4, and a sedimentation unit 6 connected in sequence, along with an aeration device 6 and an intelligent control system 7.

[0035] Wastewater enters the anaerobic unit 1 through the inlet pipe 11. Under the action of the stirrer 12, it is fully mixed with the sludge returned through the second sludge pipe 14 and the return mixed liquid of the high-efficiency aerobic tank return pipe 46, and some organic matter is degraded. The water purified by the anaerobic unit flows to the high-efficiency aerobic unit 4 through the first overflow hole 13.

[0036] The sludge returned from sedimentation unit 5 is metered by the first flow meter 531 and enters the biological selection unit 2 together with the screening agent through the screening agent dosing pipe 22 via the first sludge pipe 21. Under the action of the mixing guide plate 23, it is fully mixed and, under controllable conditions, specific microbial groups with high efficiency in decomposing pollutants are screened. The screened microbial group liquid flows to the bio-enhancing unit 3 through the second flow hole 24.

[0037] Within the bio-enhancing unit 3, the air supplied by the aeration device 6 is transmitted through the first air pipe 33 under the control of the first regulating valve 32, aerated by the first high-efficiency aeration device 34, and controlled by the first online dissolved oxygen meter 37 within the range of 4.0~5.0 mg / L. The heating device 31 is turned on, and the temperature of the online temperature instrument 33 is controlled within the range of 25℃~30℃ to achieve high concentration and high activity of microbial community. The enhanced mixed liquid overflows into the high-efficiency aerobic unit 4 through the first overflow hole.

[0038] Within the high-efficiency aerobic unit 4, the air supplied by the aeration device 6 is transmitted through the second air pipe 42 under the control of the second regulating valve 41, and aerated by the second high-efficiency aeration device 43. The second online dissolved oxygen meter 48 is controlled at 3.0±0.5mg / L, and the online sludge concentration meter is controlled at 3.0±1.0g / L, thus achieving efficient removal of organic matter. The mixed liquor at the end of the high-efficiency aerobic unit 4 is returned to the anaerobic unit 2 for enhanced denitrification through the return pipe 46 under the control of the third regulating valve 44 and the air lift effect of the third air pipe 45. The purified water from the high-efficiency aerobic unit 4 overflows into the sedimentation unit 5 through the second overflow hole 47 to achieve sludge-water separation. Part of the generated sludge is returned to the biological selection unit 2 and the anaerobic unit 1 through the sludge return pump 533, and part of the remaining sludge is discharged from the system through the sludge discharge pipe 52.

[0039] The entire system operates automatically under the monitoring of the intelligent control system 7. Through real-time optimization and control, the operating cost of the entire system is reduced by more than 30% compared with the traditional AO process.

[0040] During the above operations, the following parameters should be controlled:

[0041] The dissolved oxygen, sludge concentration, and air conditioning valve of the high-efficiency aerobic unit 3 vary with the water quality of the wastewater to be treated.

[0042] The types of screening agents and the dissolved oxygen and temperature of bio-enhancing unit 6 vary with the type of wastewater to be treated and the water quality parameters.

[0043] This embodiment includes the following process steps: See Figure 1 .

[0044] like Figure 1 The diagram illustrates a high-load, low-carbon wastewater biological treatment process. This process employs a combination of anaerobic treatment, biological selection, bioaugmentation, and highly efficient aerobic treatment, and integrates an intelligent control system to achieve high-load, low-cost operation of the wastewater biological treatment system. Specifically, it includes the following steps:

[0045] S1. Wastewater enters anaerobic unit 1 and is fully mixed with return sludge and return mixed liquor under the action of stirrer 12, which degrades some organic matter.

[0046] S2, the sludge returned from sedimentation unit 5 and the screening agent enter biological selection unit 2 together, and under controllable conditions, specific microbial groups with efficient decomposition ability of pollutants are screened.

[0047] S3. The effluent from step S2 flows by gravity into the biological enhancement unit 3, where microbial enhancement is carried out under conditions of 25℃~30℃ and dissolved oxygen 4.0~5.0mg / L to achieve high concentration and high activity of microbial community.

[0048] S4. The effluent from step S1 and step S3 enter the high-efficiency aerobic unit 4 together. The dissolved oxygen is precisely controlled at 3.0±0.5mg / L through the high-efficiency aeration system to achieve efficient removal of organic matter. This unit has high oxygen utilization rate, energy consumption is reduced by more than 40% compared with traditional aeration systems, and the treatment load is increased by more than 10%.

[0049] S5. Part of the mixed liquor at the end of the high-efficiency aerobic unit 4 is returned to the anaerobic unit 1 for enhanced denitrification, and the remaining part enters the sedimentation unit 5 to achieve sludge-water separation. Part of the separated sludge is returned to the anaerobic unit 1, part is returned to the biological selection unit 2, and the remaining part is discharged from the system.

[0050] S6. The entire process is monitored and optimized in real time by the intelligent control system 7, achieving high-load, low-carbon operation of the system.

[0051] Example 2

[0052] The difference between this embodiment and Embodiment 1 is that the biological selection unit 2, the biological enhancement unit 3, and the high-efficiency aerobic unit 4 are designed separately and are located outside the high-efficiency aerobic unit 4, which facilitates the transformation and upgrading of the existing sewage treatment system.

[0053] Example 3

[0054] The difference between this embodiment and embodiment one is that the mixing method in biological selection unit 2 can be one or more combinations of mechanical stirring, hydraulic stirring or aeration stirring, to adapt to different water quality mixing requirements.

Claims

1. A high-load, low-carbon biological wastewater treatment process, characterized in that, The process route combines anaerobic treatment, biological selection, bio-enhanced treatment, and a high-efficiency aerobic phase, and integrates aeration and intelligent control systems to achieve high-load, low-cost operation of the wastewater biological treatment system. Specifically, it includes the following steps: S1. Wastewater enters the anaerobic unit and is thoroughly mixed with returned sludge and returned mixed liquor by the action of a stirrer, which degrades some of the organic matter. S2. The sludge returned from the sedimentation unit and the screening agent enter the biological selection unit together, and under controllable conditions, specific microbial groups with efficient decomposition capabilities for pollutants are screened. S3. Allow the effluent from step S2 to flow by gravity into the bio-enhancing unit, where microbial enhancement is carried out under conditions of 25℃~30℃ and dissolved oxygen 4.0~5.0mg / L to achieve high concentration and high activity of microbial communities. S4. The effluent from step S1 and step S3 enter the high-efficiency aerobic unit together. The dissolved oxygen is precisely controlled at 3.0±0.5 mg / L through the high-efficiency aeration system to achieve efficient removal of organic matter. This unit has high oxygen utilization rate, energy consumption is reduced by more than 40% compared with traditional aeration systems, and the treatment load is increased by more than 10%. S5. Part of the mixed liquor at the end of the high-efficiency aerobic unit is returned to the anaerobic unit for enhanced denitrification, and the remaining part enters the sedimentation unit to achieve sludge-water separation. Part of the separated sludge is returned to the anaerobic unit, part is returned to the biological selection unit, and the remaining part is discharged from the system. S6. The entire process is monitored and optimized in real time by an intelligent control system to achieve high-load, low-carbon operation of the system.

2. A high-load, low-carbon biological wastewater treatment device for implementing the process described in claim 1, characterized in that, The system includes an anaerobic unit, a biological selection unit, a bio-enhancing unit, a high-efficiency aerobic unit, and a sedimentation unit connected in sequence, as well as a supporting aeration and intelligent control system. The biological selection unit is equipped with a first sludge pipe, a screening agent pipe, and a mixing guide plate. The bio-enhancing unit is equipped with a first regulating valve, a first air pipe, a first high-efficiency aeration device, a heating device, an online temperature monitoring instrument, and a first online dissolved oxygen meter. The high-efficiency aerobic unit is equipped with a second regulating valve, a second air pipe, a second high-efficiency aeration device, a return pipe, a third regulating valve, a third air pipe, a second online dissolved oxygen meter, and an online sludge concentration meter. The intelligent control system has a built-in AI algorithm module.

3. The high-load, low-carbon wastewater biological treatment device according to claim 2, characterized in that, The biological selection unit and the biological enhancement unit are located within the high-efficiency aerobic unit. Wastewater between the units is connected through overflow holes and overflow holes. The overflow hole of the biological enhancement unit is higher than the working liquid level of the high-efficiency aerobic unit.

4. The high-load, low-carbon wastewater biological treatment device according to claim 2, characterized in that, The guide plates in the biological selection unit are arranged sequentially along the water flow direction, and the screening agent is a composite compound rich in amino acids and various trace elements.

5. A high-load, low-carbon wastewater biological treatment device according to claim 2, characterized in that, Both the bio-enhancing unit and the high-efficiency aerobic unit are equipped with high-efficiency aeration equipment with an oxygen transfer efficiency of not less than 60%, and have online maintenance and anti-clogging functions. The high-efficiency aeration equipment is interlocked with the online dissolved oxygen meter through the regulating valve on the aeration pipeline to achieve precise control of the dissolved oxygen concentration of each unit.

6. A high-load, low-carbon wastewater biological treatment device according to claim 2, characterized in that, The biological selection unit is equipped with a first sludge pipe connected to the sedimentation unit, the high-efficiency aerobic unit is equipped with a return pipe connected to the anaerobic unit, and the sedimentation unit is equipped with a second sludge pipe connected to the anaerobic unit.

7. A high-load, low-carbon wastewater biological treatment device according to claim 2, characterized in that, The intelligent control system has a built-in AI algorithm module that can predict operating parameters based on historical and real-time data, achieve precise aeration and process optimization, shorten control response time, and achieve energy saving and consumption reduction goals.

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