CN119430360A - An air lift sludge return device, an operation method and an air lift sludge calculation method - Google Patents

Abstract

The invention provides a non-blocking air stripping sludge reflux device which comprises a cylinder body, a connecting flange and an air inlet pipe, wherein the top end of the cylinder body is sealed, a sludge inlet base for allowing sludge to enter the cylinder body is arranged at the bottom of the cylinder body, a mixing pipe is connected to the side wall of the cylinder body, the connecting flange is fixedly connected to the tail end of the mixing pipe and is coupled with a reflux pipeline, the air inlet pipe is fixedly connected to the side wall of the cylinder body and is communicated with an existing blast room, and the connecting position of the air inlet pipe is positioned between the mixing pipe and the sludge inlet base. The invention also provides a gas stripping sludge reflux operation method and a gas stripping sludge calculation method, which can realize the reflux of nitrifying liquid and sludge only by sending the gas from the existing blower room of the sewage treatment plant, and the gas source provided by the aeration air pipe bypass can realize the high reflux ratio of sludge under the condition of low energy consumption.

Description

Air stripping sludge reflux device, operation method and air stripping sludge calculation method

Technical Field

The invention relates to the technical field of sewage purification, in particular to a gas stripping sludge reflux device, an operation method and a gas stripping sludge calculation method.

Background

The sludge reflux pump mainly relates to the mixed liquid reflux and denitrification process in the sewage treatment process. The sludge reflux pump is used as key equipment of a water quality purification plant, and has the main functions of continuously refluxing sludge treated in a sedimentation tank or other sludge treatment equipment to a biochemical reaction tank so as to maintain stable activated sludge concentration (MLSS), thereby being beneficial to uniform distribution and exchange of anaerobic bacteria and aerobic bacteria, improving biological denitrification and dephosphorization effects, effectively preventing sludge expansion, improving sewage treatment efficiency and effluent quality, and guaranteeing stable operation of a sewage treatment system. However, the traditional paddle sludge reflux pump in the actual operation process of the water quality purification plant has the following defects:

the traditional paddle sludge reflux pump usually depends on an electric driving motor to operate, has lower efficiency, is relatively higher in energy consumption and carbon emission, does not meet the current environment-friendly requirements of energy conservation, emission reduction, pollution reduction and carbon reduction synergy, and can increase the operation cost of a sewage treatment plant in the long-time operation process.

The maintenance cost is high, because the traditional paddle sludge reflux pump has a complex structure, and is immersed under the sludge mixed liquid for a long time, a plurality of parts such as impellers and bearings are easy to grind and damage, and special equipment maintenance personnel are required to periodically check and replace the worn parts to perform operations such as fault detection, cleaning and lubrication so as to ensure the normal operation of the pump, thereby increasing the operation cost and the time cost.

The traditional paddle sludge reflux pump is easy to be influenced by a large amount of solid particles, fibers and other impurities in the sludge in the operation process, so that the blockage or the blocking phenomenon is caused, and the stable operation of the pump is influenced.

The adjusting range is limited, the flow and pressure adjusting range of the traditional paddle sludge reflux pump is relatively limited, and the traditional paddle sludge reflux pump is difficult to adapt to the reflux demand change under different process conditions. This may lead to poor treatment results or excessive energy consumption.

The noise and vibration are large, and the traditional paddle sludge reflux pump can generate large noise and vibration in the running process, which not only affects the working environment, but also can have adverse effects on the structure and the service life of the pump.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides a gas stripping sludge reflux device, an operation method and a gas stripping sludge calculation method, and in order to achieve the purposes, the invention adopts the following technical scheme:

The utility model provides a no jam air stripping mud reflux unit, includes barrel, flange and intake pipe, the top of barrel is sealed, the bottom is provided with and is used for mud to get into to be connected with the hybrid tube on mud base, the lateral wall of barrel, flange fixed connection is at the end of hybrid tube and with return line coupling connection, on the lateral wall of intake pipe fixedly connected with barrel and switch on current blast air room, the intake pipe hookup location is located between hybrid tube and the mud base of advancing.

Still further, fixedly connected with stopper on the flange, offered the draw-in groove on the stopper, the back flow is installed on the base that is used for fixed back flow, is provided with the fixture block on the base, the fixture block supports flange with the draw-in groove cooperation and leans on the tip of back flow.

Furthermore, two limit posts which are arranged in parallel are fixedly connected to the base, the limit posts are respectively positioned at two sides of the return pipe, limit grooves matched with the two limit posts are formed in the limit block, and the limit grooves are used for clamping the limit block between the limit posts.

Furthermore, the matching part of the return pipe and the connecting flange is arranged in a wedge shape, so that the cylinder body is arranged on the return pipe from top to bottom.

Furthermore, the top of the cylinder is fixedly connected with a lifting lug for hanging ropes.

Further, the top end of the cylinder body is fixedly connected with a counterweight cylinder.

Furthermore, a volute structure is arranged in the cylinder body, and air flow entering the cylinder body from the air inlet pipe flows into the return pipe along the volute structure.

A gas stripping sludge reflux operation method, which utilizes the reflux device, comprises the following steps:

s1, lifting a reflux device, clamping a limiting block between two limiting columns of a base, descending the reflux device to enable the reflux device to slide between the limiting columns, aligning and matching the reflux device with a reflux pipe under the combined action of the two limiting columns, the limiting block and the clamping block when the clamping groove of the limiting block is clamped on the clamping block on the base, and stabilizing the reflux device, wherein at the moment, a mud inlet base of the reflux device is positioned on a water bottom base surface;

S2, opening a ball valve of an air inlet pipe, so that part of gas generated by a Roots blower of the conventional blowing room of the sewage plant is introduced into the cylinder through the air inlet pipe to generate bubbling action, the bubbles rise and fill the whole cylinder due to buoyancy and impact force, a gas-liquid-solid three-phase mixed liquid is formed in the cylinder, a liquid-solid two-phase mixed liquid is formed outside the cylinder, the density of the three-phase mixed liquid is smaller than that of the two-phase mixed liquid, the three-phase mixed liquid flows out through a return pipe, and mud water at the bottom of the cylinder is driven to continuously enter the cylinder and be discharged, so that stable sludge reflux is formed.

In S2, the compressed air flowing into the cylinder from the air inlet pipe drives the muddy water flowing into the cylinder from the mud inlet base to generate a gas-liquid-solid three-phase fluid vortex through the vortex structure in the cylinder, and finally is discharged from the return pipe.

According to the intended lifting height L and the immersion depth H of the reflux device, the theoretical air quantity of the air stripping reflux is calculated, and the density ρ2 of the three-phase mixed liquid is smaller than that of the mixed liquid ρ1 of two phases. According to the condition of liquid balance, under the action of the water column pressure of the part, immersed below the liquid level, of the gas-liquid-solid three-phase mixed liquid, the gas-liquid-solid three-phase mixed liquid rises to the total height of L, and the balance relation can be listed as:

ρ1H=ρ2L;

Wherein ρ1 is the density (kg/m ³) of the sludge mixed liquid outside the sludge reflux device, ρ2 is the density (kg/m ³) of the solid-liquid-gas three-phase mixed liquid inside the sludge reflux device, H is the submerged depth m of the sludge reflux device, L is the sum m of the total height and the submerged depth of the sludge reflux device, and H/L is the submerged rate;

In the same way, the principle of normal work of gas stripping is that as long as ρ1H > ρ2L, three-phase mixed liquid flows out through a return pipe to drive muddy water at the bottom of the cylinder to continuously enter the cylinder and be discharged, so that stable sludge return is formed;

The theoretical stripping reflux air usage is calculated according to the following formula:

;

Wherein W is the consumption m ³/H of compressed gas sent by a blower, K is a safety coefficient, 1.2 is generally taken, Q is the designed sludge lifting flow m ³/H, and H is the intended sludge lifting height m; The efficiency coefficient is generally 0.35-0.45, and h is the immersion depth m of the stripping reflux pump.

Compared with the prior art, the invention has the following beneficial effects:

1. The gas stripping sludge reflux device provided by the invention has the advantages of simple structure, low cost, convenience in installation, no need of maintenance and easiness in control during operation, and simultaneously has large lifting capacity for sludge, is beneficial to improving the working efficiency of water stripping treatment, and has a certain significance for energy conservation, consumption reduction, synergy and carbon reduction in the operation process of a sewage plant;

2. When sewage is treated by using an activated sludge method, for example, when the technology is designed as A ² O, the internal reflux ratio of the sludge is usually set to be between 200 and 400 percent, in order to ensure that the effluent quality reaches standard discharge, the sludge concentration in actual operation is required to be higher and better, so that the reflux quantity of the sludge is generally far beyond the actual demand quantity, and when the traditional paddle type reflux pump driven by electric energy is used, the excessive reflux inevitably increases the consumption of the electric energy and the risk of damage to a pump body, the air stripping sludge reflux device takes an air lifting pushing technology as fluid power, does not need parts such as underwater paddles and the like which are easy to block by the traditional water pump, does not need electric power to drive, can realize the reflux of nitrified liquid and sludge only by an air source provided by an air supply provided by an aeration air pipe bypass, has the advantages of low energy consumption, small occupied area and the like, so that the daily operation cost of the sewage treatment plant is remarkably improved, and the whole investment cost is reduced;

3. The number of the traditional paddle type reflux pumps directly determines the adjustment gear of the internal reflux ratio of the process, the adjustment gear can be generally scheduled according to fixed gears of 100%, 200% and the like, the reflux ratio of the reflux sludge mixed liquid of the sludge reflux pump based on the air stripping principle can be adjusted through the compressed air quantity blown out by a blower, so that the larger reflux ratio is realized.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic diagram of a front view structure of an embodiment of the present invention;

Fig. 2 is a schematic top view of a limiting block according to an embodiment of the invention.

In the drawing, a base 1, a clamping block 2, a limit column 3, a cylinder 4, a connecting flange 5, an air inlet pipe 6, a mixing pipe 7, a limit block 8, a clamping groove 9, a limit groove 10, a lifting lug 11, a counterweight cylinder 12, a volute structure 13, a return pipe 14 and a mud inlet base 15.

Detailed Description

The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.

Referring to fig. 1 and 2, a non-blocking air-stripping sludge reflux device comprises a cylinder 4, a connecting flange 5 and an air inlet pipe 6, wherein the top end of the cylinder 4 is sealed, the bottom is provided with a sludge inlet base 15 for the sludge to enter the cylinder 4, a mixing pipe 7 is connected to the side wall of the cylinder, the mixing pipe 7 adopts a conical cylinder design to increase the pressure in the mixing pipe 7, the connecting flange 5 is fixedly connected to the tail end of the mixing pipe 7 and is in coupling connection with a return pipe 14, the air inlet pipe 6 is fixedly connected with the side wall of the cylinder 4 and is connected with an existing blast room, and the connecting position of the air inlet pipe 6 is positioned between the mixing pipe 7 and the sludge inlet base.

The cylinder 4 is inflated through the air inlet pipe 6, air flow forms three-phase mixed liquid of gas, liquid and solid in the cylinder 4, the three-phase mixed liquid upwards flows away from the return pipe 14 through the mixing pipe 7, meanwhile, the air flow changes the pressure in the cylinder 4, so that the liquid-solid two-phase mixed liquid at the bottom enters the cylinder 4 from the mud inlet base 15, and the three-phase mixed liquid is formed with the newly-entered air and is discharged from the return pipe 14, and the return work is completed.

In this embodiment, as shown in fig. 1, the connection flange 5 is fixedly connected with a limiting block 8, the limiting block 8 is provided with a clamping groove 9, the return pipe 14 is installed on the base 1 for fixing the return pipe 14, the base 1 is provided with a clamping block 2, and the clamping block 2 is matched with the clamping groove 9 to support the connection flange 5 against the end of the return pipe 14. The matching of the clamping block 2 and the clamping groove 9 is used for facilitating the rapid alignment and installation of the reflux device, and the operation is convenient.

In this embodiment, as shown in fig. 2, two parallel limiting columns 3 are fixedly connected to the base 1, the limiting columns 3 are respectively located at two sides of the return pipe 14, limiting grooves 10 matched with the two limiting columns 3 are formed in the limiting block 8, and the limiting grooves 10 are used for clamping the limiting block 8 between the limiting columns 3. The limiting block 8 is matched with the limiting column 3 by adopting a limiting groove 10 with a certain thickness, so that the reflux device is stable when being installed on the limiting column 3 in a sliding manner from top to bottom.

In another embodiment, as shown in fig. 1, the fitting of the return tube 14 with the connecting flange 5 is arranged in a wedge shape, so that the cylinder 4 is mounted on the return tube 14 from top to bottom. The design is convenient for the return pipe 14 to be aligned and matched with the connecting flange 5, so that automatic installation is realized, and the operation of launching by workers is not needed.

In this embodiment, as shown in fig. 1, a lifting lug 11 for hanging a rope is fixedly connected to the top of the cylinder 4. The hoisting operation and the installation are convenient, and the labor is saved and the convenience is realized.

In this embodiment, as shown in fig. 1, the top end of the cylinder 4 is fixedly connected with a weight cylinder 12. Is used for overcoming the buoyancy effect of sinking.

In another embodiment, referring to fig. 1, a scroll structure 13 is disposed in the cylinder 4, and the air flow entering the cylinder 4 from the air inlet pipe 6 flows into the return pipe 14 along the scroll structure 13. The effect of absorbing the mud water at the bottom of the cylinder body 4 is increased, and power resources are saved.

The invention also provides a gas stripping sludge reflux operation method, which uses the reflux device, and comprises the following steps:

S1, lifting a reflux device, clamping a limiting block 8 between two limiting columns 3 of a base 1, descending the reflux device to enable the reflux device to slide between the limiting columns 3, aligning and matching the reflux device with a reflux pipe 14 under the combined action of the two limiting columns 3, the limiting block 8 and the clamping block 2 when a clamping groove 9 of the limiting block 8 is clamped on the clamping block 2 on the base 1, and stabilizing the reflux device, wherein at the moment, a mud inlet base 15 of the reflux device falls on a water bottom base surface;

S2, opening a ball valve of an air inlet pipe 6, so that part of gas generated by a Roots blower of the conventional blowing room of the sewage plant is introduced into the cylinder 4 through the air inlet pipe 6 to generate bubbling action, the bubbles rise due to buoyancy and impact force and fill the whole cylinder 4, a gas-liquid-solid three-phase mixed solution is formed in the cylinder 4, a liquid-solid two-phase mixed solution is outside the cylinder 4, the density of the three-phase mixed solution is smaller than that of the two-phase mixed solution, the three-phase mixed solution flows out through a return pipe 14, and muddy water at the bottom of the cylinder 4 is driven to continuously enter the cylinder 4 and be discharged, so that stable sludge reflux is formed.

Further, in S2, the compressed air flow entering the cylinder 4 from the air inlet pipe 6 drives the muddy water entering the cylinder 4 from the mud inlet base 15 to generate a gas-liquid-solid three-phase fluid vortex through the vortex structure in the cylinder 4, and finally is discharged from the return pipe 14. The suction effect of the air flow of the cylinder body 4 is increased.

The invention also provides a calculation method of the gas stripping sludge, which calculates and obtains the theoretical gas stripping reflux air quantity according to the intended lifting height L and the immersion depth H of the reflux device, wherein the density ρ2 of the three-phase mixed liquid is smaller than that of the mixed liquid ρ1 of two phases. According to the condition of liquid balance, under the action of the water column pressure of the part, immersed below the liquid level, of the gas-liquid-solid three-phase mixed liquid, the gas-liquid-solid three-phase mixed liquid rises to the total height of L, and the balance relation can be listed as:

ρ1H=ρ2L;

Wherein ρ1 is the density (kg/m ³) of the sludge mixed liquid outside the sludge reflux device, ρ2 is the density (kg/m ³) of the solid-liquid-gas three-phase mixed liquid inside the sludge reflux device, H is the submerged depth m of the sludge reflux device, L is the sum m of the total height and the submerged depth of the sludge reflux device, and H/L is the submerged rate;

In the same way, the principle of normal work of gas stripping is that as long as ρ1H > ρ2L, three-phase mixed liquid flows out through a return pipe to drive muddy water at the bottom of the cylinder to continuously enter the cylinder and be discharged, so that stable sludge return is formed;

The theoretical stripping reflux air usage is calculated according to the following formula:

;

Wherein W is the consumption m ³/H of compressed gas sent by a blower, K is a safety coefficient, 1.2 is generally taken, Q is the designed sludge lifting flow m ³/H, and H is the intended sludge lifting height m; The efficiency coefficient is generally 0.35-0.45, and h is the immersion depth m of the stripping reflux pump.

The reflux device and the operation method are successfully applied to Surabaja-quality purification plants (first and second stages) of China county hemp, effluent of the water quality purification plants is implemented as a first-stage A standard, four integrated self-reflux improved oxidation ditch seats are arranged at the first stage and the second stage, and each seat is sequentially provided with an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone from inside to outside. The treatment capacity is 4 ten thousand tons/day, wherein the water inflow of a single pond is 400m ³/h, the effective residence time of an anaerobic zone design is 1.0h, the effective volume of the pond depth is 6.1m and is 417m3, the effective volume ratio of an anaerobic zone, an anoxic zone and an aerobic zone is 1:2:6, the original design of a single oxidation ditch adopts 4 sludge reflux pumps with an autotransformer, and each P=5kw and Q=100deg.C ³/h. In summer, the reflux ratio is usually set to 150%, the stable standard discharge can be realized by setting 300% in winter, in the present stage, the 1# oxidation ditch is originally started for reflux by 2 sludge reflux pumps, the standard discharge of the treated water quality can be realized by setting 150% of the sludge reflux ratio, after the treated water is placed along a guide pipe and is fixedly connected with a sludge reflux pipeline in a coupling way at a position of 6m under water, the pressure gauge displays that the blowing air pressure of a blower is greater than 6 atmospheres, and the gear adjustable ball valve is started and adjusted at the moment according to the flow condition of a gas flowmeter. Through adjusting the gas flow, adjust the mud reflux ratio to 150%, through replace originally 2 mud reflux pump operation after 24 hours with 1 this gas stripping mud reflux unit, oxidation ditch effluent COD, ammonia nitrogen, total phosphorus, total nitrogen's removal rate compares with before the pump body replacement, and the operation effect is as follows table shows:

table 1 two submersible sewage pumps realize the removal rate of sewage organic matters under the condition of 150% of sludge reflux ratio

TABLE 2A method for realizing the removal rate of organic matters in sewage under the condition of 150% of sludge reflux ratio

The energy consumption data and carbon emission data consumed by each reflux pump are as follows:

TABLE 3 electric quantity, energy consumption and carbon emission quantity of sludge reflux pump

In practical implementation, on one hand, 1 sludge reflux pump of the invention replaces two sludge reflux pumps of 5kw, can theoretically realize 43800 DEG electricity, 10.76tce energy consumption reduction and 42.66t carbon emission reduction, while in an example sewage plant, each oxidation ditch is originally provided with 4 sludge reflux pumps of 5kw, 4 oxidation ditches are arranged in the plant area, 16 sludge reflux pumps of 5kw in total can be replaced by the invention, the sludge reflux ratio of 150% in summer can theoretically realize 350400 DEG electricity consumption reduction, 43.04tce energy consumption reduction, 170.64t carbon emission reduction, and the sludge reflux ratio of 300% in winter can realize 700800 DEG electricity consumption reduction, 86.08tce energy consumption reduction and 341.28t carbon emission reduction. On the other hand, under the condition of unchanged process, the removal rates of pollutants COD, NH3-N, TP and TN in the sewage can be respectively increased by 1.99%, 0.42%, 3.11% and 5.58%. The method can remarkably reduce the operation and maintenance cost while playing the roles of energy saving, consumption reduction, pollution reduction and carbon reduction.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a no jam air stripping mud reflux unit, its characterized in that, includes barrel, flange and intake pipe, the top of barrel is sealed, the bottom is provided with and is used for mud to get into to be connected with the hybrid tube on mud base, the lateral wall of barrel, flange fixed connection is at the end of hybrid tube and with return line coupling connection, on the lateral wall of intake pipe fixedly connected with barrel and turn on current blast room, the intake pipe hookup location is located between hybrid tube and the mud base of advancing.

2. The non-clogging air-lifted sludge reflux device according to claim 1, wherein the connecting flange is fixedly connected with a limiting block, the limiting block is provided with a clamping groove, the reflux pipe is arranged on a base for fixing the reflux pipe, the base is provided with a clamping block, and the clamping block is matched with the clamping groove to enable the connecting flange to be abutted against the end part of the reflux pipe.

3. The non-clogging air-stripping sludge reflux device as claimed in claim 2, wherein the base is fixedly connected with two limit posts which are arranged in parallel, the limit posts are respectively positioned at two sides of the reflux pipe, limit grooves matched with the two limit posts are formed in the limit block, and the limit grooves are used for clamping the limit block between the limit posts.

4. A non-clogging stripping sludge recirculation device as in claim 3, wherein the engagement of the recirculation tube with the connecting flange is wedge-shaped to mount the cartridge on the recirculation tube from top to bottom.

5. The non-clogging air-stripping sludge reflux device of claim 1, wherein the top of the cylinder is fixedly connected with a lifting lug for hanging ropes.

6. The non-clogging stripping sludge recirculation device according to claim 1, wherein the top end of the cylinder is fixedly connected with a counterweight cylinder.

7. The non-clogging stripping sludge recirculation device as claimed in claim 1, wherein a scroll structure is arranged in the cylinder, and the air flow entering the cylinder from the air inlet pipe flows into the recirculation pipe along the scroll structure.

8. A method for operating a gas stripping sludge reflux, characterized by using the reflux device according to any one of claims 1 to 7, comprising the steps of:

s1, lifting a reflux device, clamping a limiting block between two limiting columns of a base, descending the reflux device to enable the reflux device to slide between the limiting columns, aligning and matching the reflux device with a reflux pipe under the combined action of the two limiting columns, the limiting block and the clamping block when the clamping groove of the limiting block is clamped on the clamping block on the base, and stabilizing the reflux device, wherein at the moment, a mud inlet base of the reflux device is positioned on a water bottom base surface;

S2, opening a ball valve of an air inlet pipe, so that part of gas generated by a Roots blower of the conventional blowing room of the sewage plant is introduced into the cylinder through the air inlet pipe to generate bubbling action, the bubbles rise and fill the whole cylinder due to buoyancy and impact force, a gas-liquid-solid three-phase mixed liquid is formed in the cylinder, a liquid-solid two-phase mixed liquid is formed outside the cylinder, the density of the three-phase mixed liquid is smaller than that of the two-phase mixed liquid, the three-phase mixed liquid flows out through a return pipe, and mud water at the bottom of the cylinder is driven to continuously enter the cylinder and be discharged, so that stable sludge reflux is formed.

9. The method of claim 1, wherein S2, compressed air flowing into the cylinder from the air inlet pipe passes through the vortex structure in the cylinder to drive the muddy water flowing into the cylinder from the mud inlet base to generate gas-liquid-solid three-phase fluid vortex, and finally discharged from the return pipe.

10. A calculation method of gas stripping sludge is characterized in that theoretical gas stripping reflux air quantity is calculated according to a planned lifting height L and a reflux device immersion depth H, and the density ρ2 of a three-phase mixed solution is smaller than that of a two-phase mixed solution ρ1. According to the condition of liquid balance, under the action of the water column pressure of the part, immersed below the liquid level, of the gas-liquid-solid three-phase mixed liquid, the gas-liquid-solid three-phase mixed liquid rises to the total height of L, and the balance relation can be listed as:

ρ1H=ρ2L;

Wherein ρ1 is the density (kg/m ³) of the sludge mixed liquid outside the sludge reflux device, ρ2 is the density (kg/m ³) of the solid-liquid-gas three-phase mixed liquid inside the sludge reflux device, H is the submerged depth m of the sludge reflux device, L is the sum m of the total height and the submerged depth of the sludge reflux device, and H/L is the submerged rate;

In the same way, the principle of normal work of gas stripping is that as long as ρ1H > ρ2L, three-phase mixed liquid flows out through a return pipe to drive muddy water at the bottom of the cylinder to continuously enter the cylinder and be discharged, so that stable sludge return is formed;

The theoretical stripping reflux air usage is calculated according to the following formula:

;

Wherein W is the consumption m ³/H of compressed gas sent by a blower, K is a safety coefficient, 1.2 is generally taken, Q is the designed sludge lifting flow m ³/H, and H is the intended sludge lifting height m; The efficiency coefficient is generally 0.35-0.45, and h is the immersion depth m of the stripping reflux pump.