Transformation method of integrated rural sewage treatment equipment suitable for precipitation water outlet mode

Abstract

The invention discloses a transformation method of integrated rural sewage treatment equipment suitable for a precipitation water outlet mode, relates to the technical field of sewage treatment, and aims to solve the problems that rural sewage has the characteristic of large seasonal water quality and water quantity changes, but an anaerobic / anoxic / aerobic suspended activated sludge operation mode is generally adopted for the rural sewage at present, and the sewage treatment efficiency is low. According to the mode, the content, concentration and activity of the sludge cannot be maintained under the condition that the long-term inlet water quality and quantity change greatly. According to seasonal characteristics of rural sewage, an anaerobic / anoxic / aerobic activated sludge operation mode is adopted under a high-load water inlet condition, an anaerobic + micro-aerobic sludge bed operation mode is adopted under a low-load water inlet condition, and a load regulation type rural sewage operation mode is flexibly implemented according to water quality and water quantity, so that efficient treatment of the rural sewage is realized.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for transforming integrated rural sewage treatment equipment suitable for a sedimentation water discharge mode. Background Art

[0002] Most rural sewage treatment stations use the per capita discharge method to estimate the design scale. However, due to the imperfect laying of the pipeline network and the small size of the pipeline network, the water quality and quantity fluctuate greatly, which ultimately leads to long-term low-load and occasional full-load operation of rural sewage treatment facilities. At present, the most commonly used process is the anaerobic / anoxic / aerobic / sedimentation process. Affected by sufficient oxygen supply, the activated sludge of this process has a high content of extracellular polymers, a fast bacterial growth rate and high activity. However, rural sewage has the characteristics of large seasonal fluctuations in water volume and quality. In the low-load operation stage with low influent volume and low organic matter concentration, the equipment has poor aeration regulation, high operating energy consumption due to high-load operation, and difficulty in maintaining sludge activity. Therefore, how to maintain sludge content, concentration and activity under low-load influent conditions is an urgent problem to be solved in the variable load operation of rural sewage. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method for transforming an integrated rural sewage treatment equipment suitable for a sedimentation water discharge mode.

[0004] The present invention is implemented by the following technologies: The present invention provides a method for transforming an integrated rural sewage treatment equipment suitable for a sedimentation effluent mode, comprising the integrated rural sewage treatment equipment, wherein a waterfall reoxygenation reflux bypass is added next to the integrated rural sewage treatment equipment to achieve switching of the sludge bed operation mode at low load.

[0005] Furthermore, the waterfall reoxygenation return bypass includes a waterfall reoxygenation well, a waterfall inlet pipe, a reoxygenation water return pipe, and a bypass outlet pipe.

[0006] Furthermore, the waterfall reoxygenation well includes a waterfall device, a reoxygenation water return pump, and a liquid level regulating pump. The waterfall inlet pipe is connected from the integrated rural sewage treatment equipment to the waterfall device in the waterfall reoxygenation well, and the reoxygenation water return pipe is connected from the reoxygenation water return pump in the waterfall reoxygenation well to the integrated rural sewage treatment equipment; the bypass outlet pipe is connected from the liquid level regulating pump to the sedimentation tank.

[0007] Furthermore, the drop height and single-width flow rate of the drop device are adjustable, and the height of the outlet weir of the drop device should be 0.3m below the full liquid level height of the integrated rural sewage treatment equipment.

[0008] Furthermore, the liquid level of the waterfall reoxygenation well is controlled by a liquid level regulating pump, and the liquid level height should be 0.5m lower than the outlet weir height of the waterfall device to ensure sufficient waterfall height.

[0009] Further, the reoxygenated water return pipe returns to the bottom of the integrated rural sewage treatment equipment.

[0010] Furthermore, one end of the waterfall inlet pipe is located 0.2 m below the water level of the aerobic pool, and the other end is connected to the waterfall device.

[0011] The anaerobic + microaerobic sludge bed operation mode of the present invention is that the microorganisms in the sludge bed system adhere to the surface of the bed to form a biofilm, and the static bed system retains the sludge as much as possible, has a high biological reaction activity, can adjust its own metabolic activities according to changes in the external environment, and use suitable habitat conditions to promote the growth and activity of microorganisms. Therefore, it has the advantages of high efficiency, strong resistance to shock loads of large fluctuations in influent loads, small amount of chemical agents added, low operating costs, etc. Compared with the state of long-term high aeration volume and low load, the operation of microaerobic low load keeps the sludge in the endogenous respiration stage for a long time, and the self-attenuation rate is slowed down.

[0012] Therefore, according to the characteristics of the water quality change of the influent, the suspended sludge operation mode of the anaerobic / anoxic / aerobic process is adopted for rural sewage during the period of high influent load, and the anaerobic+microaerobic sludge bed operation mode is adopted for rural sewage during the period of low influent load. However, the anaerobic / anoxic / aerobic / precipitation process is not suitable for the anaerobic+microaerobic sludge bed operation mode. Therefore, the present invention structurally transforms the original anaerobic / anoxic / aerobic / precipitation process to realize the load-regulated rural sewage treatment operation mode.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for transforming an integrated rural sewage treatment device suitable for a sedimentation effluent method. By transforming the original anaerobic / anoxic / aerobic / sedimentation process, the method has good compatibility with the existing integrated rural sewage treatment that has been produced. The transformation method is simple and easy to operate, does not increase additional process reconstruction costs, and reduces investment and transformation costs.

[0014] The present invention applies the waterfall aeration reflux oxygen supply method to integrated rural sewage treatment, solving the problems of poor flexibility and accuracy in regulating aeration pipeline valves of small-volume integrated sewage treatment equipment in the past.

[0015] After the transformation of the present invention, the variable load operation of integrated rural sewage treatment can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram showing the structure of the device in the present invention.

[0017] In the figure: 1-integrated rural sewage treatment equipment, 2-water drop reoxygenation return bypass, 3-water drop reoxygenation well, 4-water drop inlet pipe, 5-reoxygenation water return pipe, 6-bypass outlet pipe, 7-water drop device, 8-reoxygenation water return pump, 9-liquid level regulating pump. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] The original integrated rural sewage treatment was anaerobic / anoxic / aerobic / sedimentation process, with the anaerobic, anoxic and aerobic volumes of 20m 3 、20m 3 、60m 3 The bottom of the aerobic pool is equipped with microporous aerators. The original rural integrated equipment was modified by adding a waterfall reoxygenation well next to the equipment. A waterfall inlet pipe was set in the aerobic pool. The top of the waterfall inlet pipe was located 0.2m below the water level of the aerobic pool. The other end of the waterfall inlet pipe was connected to the waterfall device, which was located in the waterfall reoxygenation well. The water in the aerobic pool flowed into the waterfall device in the waterfall reoxygenation well through the waterfall inlet pipe. The height of the waterfall device was 1m, and the single width flow of the waterfall was 3L / s. The height of the outlet weir of the waterfall device was 0.3m below the full liquid level of the integrated rural sewage treatment equipment. The water flow was reoxygenated through the waterfall. A reoxygenation water reflux pump was set at the bottom of the waterfall reoxygenation well. The reoxygenation water reflux pump refluxed the reoxygenated water in the waterfall reoxygenation well to the bottom of the integrated rural sewage treatment equipment. The reoxygenation water reflux pump was used to control the reflux volume to achieve dissolved oxygen control in the rural integrated equipment. A liquid level regulating pump is installed in the waterfall reoxygenation well to adjust the water level in the waterfall reoxygenation well, and the effluent to be discharged from the waterfall reoxygenation well is discharged to the sedimentation tank through the bypass outlet pipe in the waterfall reoxygenation well.

[0020] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transformation method for integrated rural sewage treatment equipment suitable for sedimentation water discharge mode, Features: The invention comprises an integrated rural sewage treatment device (1), wherein a waterfall reoxygenation return bypass (2) is provided next to the integrated rural sewage treatment device (1).

2. A method for transforming an integrated rural sewage treatment equipment suitable for a sedimentation water discharge method according to claim 1, Features: The waterfall reoxygenation return bypass (2) comprises a waterfall reoxygenation well (3), a waterfall water inlet pipe (4), a reoxygenation water return pipe (5), and a bypass water outlet pipe (6).

3. A method for transforming an integrated rural sewage treatment equipment suitable for a sedimentation water discharge method according to claim 2, Features: The waterfall reoxygenation well (3) comprises a waterfall device (7), a reoxygenation water return pump (8), and a liquid level regulating pump (9); the waterfall inlet pipe (4) is connected from the integrated rural sewage treatment equipment (1) to the waterfall device (7) in the waterfall reoxygenation well (3); the reoxygenation water return pipe (5) is connected from the reoxygenation water return pump (8) in the waterfall reoxygenation well (3) to the integrated rural sewage treatment equipment (1); and the bypass outlet pipe (6) is connected from the liquid level regulating pump (9) to the sedimentation tank.

4. A method for transforming an integrated rural sewage treatment equipment suitable for a sedimentation water discharge method according to claim 3, Features: The drop height and drop single width flow rate of the drop device (7) are adjustable, and the outlet weir height of the drop device (7) is 0.3 m below the full liquid level height of the integrated rural sewage treatment equipment.

5. The method for transforming an integrated rural sewage treatment equipment suitable for sedimentation water discharge according to claim 2, Features: The liquid level of the waterfall reoxygenation well (3) is controlled by a liquid level regulating pump (9), and the liquid level height should be 0.5 m lower than the height of the water outlet weir of the waterfall device (7).

6. The method for transforming an integrated rural sewage treatment equipment suitable for sedimentation water discharge according to claim 2, Features: The reoxygenated water return pipe (5) returns to the bottom of the integrated rural sewage treatment equipment (1).

7. The method for transforming an integrated rural sewage treatment equipment suitable for sedimentation water discharge according to claim 2, Features: One end of the drop water inlet pipe (4) is located 0.2 m below the water level of the aerobic pool, and the other end is connected to the drop water device (7).

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