CN107973503A - Integral type granule sludge vulcanizes decalcification device and method - Google Patents

Abstract

The invention discloses an integrated granular sludge vulcanization and decalcification device and method. The main body of the device is composed of mud collection area, water distribution area, decalcification area, vulcanization area and circulation area. In the mud collection area, there are mud collection chambers and mud guide pipes; in the water distribution area, there are water inlet pipes and water distribution chambers; in the decalcification area, there are granular sludge chambers and sedimentation separation chambers; in the vulcanization area, there are air supply chambers, sulfur bed and annular acid storage chambers ; The circulation area is equipped with an acid liquid circulation system and a mixed liquid circulation system. Through the function of the vulcanization zone, the continuous production of sulfuric acid is realized; through the function of the decalcification zone, the continuous dissolution of calcium carbonate is realized; through the function of the circulation zone, the recycling of sulfuric acid solution is realized; Output of granular sludge. The invention integrates acid production by sulfuration and decalcification of granular sludge, and the device has a compact structure; the acid is produced by sulfur bacteria, and the cost is low, and the sulfur bacteria can oxidize elemental sulfur into sulfuric acid only by aerating the sulfur bed; The decalcification is dissolved with acid solution, and the amount of acid is controllable, which can reduce the damage of granular sludge.

Description

Integrated Granular Sludge Sulfurization and Decalcification Device and Method

technical field

The invention relates to a granular sludge decalcification device, in particular to an integrated granular sludge sulfide decalcification device and method.

Background technique

Human life and production activities discharge a large amount of organic wastewater, resulting in serious pollution of lakes, rivers and coastal waters in my country. As a class of cost-effective wastewater treatment technologies, UASB, EGSB, and IC reactors are widely used in organic wastewater treatment. Organic wastewater, especially industrial organic wastewater generally contains calcium. During anaerobic biological treatment, organic pollutants are converted into carbon dioxide, combined with calcium to produce calcium carbonate, which is distributed inside and on the surface of granular sludge, which can affect activity by affecting mass transfer. Calcified granular sludge accumulates in the reactor, which not only reduces the effective volume of the device, increases the cost of anaerobic digestion engineering, but also limits the application of anaerobic digestion technology.

Anaerobic granular sludge is a natural aggregate of anaerobic digesting microorganisms, and the performance of UASB, EGSB, and IC reactors is closely related to the activity of anaerobic granular sludge. Preventing calcification of anaerobic granular sludge and promoting decalcification of calcified anaerobic granular sludge will undoubtedly help maintain the function of anaerobic granular sludge and help the continuous operation of high-efficiency anaerobic reactors. So far, the main means to deal with the calcification of granular sludge in engineering is to carry out chemical decalcification pretreatment of wastewater or increase the replacement frequency of calcified granular sludge in the reactor. The former needs to add a large amount of chemicals, and the latter needs to add a large amount of High-efficiency sludge has a higher cost. Research and development of cost-effective methods for calcium prevention and decalcification of granular sludge has become an urgent task to ensure the development of anaerobic digestion technology. The invention uses cheap and bulky sulfur particles as materials, produces sulfuric acid through biological vulcanization, and then dissolves calcium carbonate with sulfuric acid, so that the amount of acid produced is controllable, the decalcification product is pollution-free, the treatment process is low-cost, and has good prospects for popularization and application.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an integrated granular sludge sulfidation and decalcification device. The concrete technical scheme that the present invention adopts is as follows:

Integrated granular sludge vulcanization and decalcification device, the main body of the device is divided into sludge collection area, water distribution area, decalcification area and vulcanization area from bottom to top. The circulation area is independent of the main body of the device and is used to connect the water distribution area and decalcification area. And the water distribution area and vulcanization area; the mud collection area is connected with the mud guide pump, water stop valve and the bottom of the inverted cone mud collection chamber from bottom to top through the mud guide pipe; the water distribution area is provided with water inlet pipes and water distributors from bottom to top , the inlet pipe is provided with an inlet water pump; several pH detection ports are arranged on the side wall of the decalcification area, and the decalcification area is divided into a granular sludge decalcification reaction chamber and a sedimentation separation chamber from bottom to top, and a settling separation chamber is set above the sedimentation separation chamber Sludge water separator, the side wall of the device above the mud water separator is provided with an outlet pipe with a control valve; the bottom of the vulcanization zone is separated from the decalcification zone by a porous filter plate, and the middle part of the vulcanization zone is wrapped by a cylindrical outer wall to form a sulfur bed. The bottom of the outer wall of the bed and the inner wall of the main body of the device are sealed by an annular water baffle. The bottom of the sulfur bed is equipped with an air supply device consisting of a gas delivery pipe and a tubular microporous aeration head. A porous bottom plate, a headspace chamber is arranged on the sulfur bed, and the headspace room is connected to the tail gas pipe for exhausting the tail gas; the sulfur bed is surrounded by an annular acid storage room, which is used to collect the sulfuric acid liquid overflowing from the sulfur bed; The circulation area is equipped with an acid liquid return pipe, an acid liquid return pump, a mixed liquid return pipe and a mixed liquid return pump. The upper part of the decalcification area is returned to the water distribution area through the mixed liquid return pipe and the mixed liquid return pump. The return pipe and the acid return pump lead into the water distribution area.

This scheme can also further adopt the following preferred mode:

The volume ratio of the mud collection area, water distribution area, decalcification area and vulcanization area is 1-1.5:1:8-10:1.5-2.

The bottom of the annular acid storage chamber is on the same level as the porous bottom plate of the sulfur granular bed, and the height of the acid liquid in the acid storage chamber is controlled at 10% to 20% of the height of the sulfur granular bed; the volume ratio between the sulfur granular bed and the annular acid storage chamber is 1: 0.8～1.

The volume ratio between the granular sludge decalcification reaction chamber and the sedimentation separation chamber in the decalcification zone is 1:0.3-0.4; the included angle between the baffle plate of the mud-water separator and the side wall of the main body of the device is 30°-40°; The vertical distance between the outlet pipe in the precipitation separation chamber and the top of the decalcification area is 5-10cm; the decalcification area is equipped with three pH detection ports equidistant along the height direction, and the vertical distance between the pH detection port at the bottom and the water inlet pipe is 15-20 cm.

The vertical distance between the liquid inlet end of the acid liquid return pipe and the bottom of the vulcanization zone is 5-10 cm; the vertical distance between the liquid inlet end of the mixed liquid return pipe and the top of the decalcification area is 10-15 cm.

The height-to-diameter ratio of the whole granular sludge sulfidation and decalcification device is 5-7:1, the height-to-diameter ratio of the sludge collection area, water distribution area and vulcanization area is 0.5-1:1, and the height-to-diameter ratio of the decalcification area is 3-7:1. 4:1.

The bottom angle of the inverted conical mud collecting chamber is 50°～70°; the vertical distance between the water inlet pipe and the top of the chamber is 5～10cm; The distance is 5-10cm.

The sulfur particle bed may be filled with elemental sulfur particles, and the decalcification zone may be filled with granular sludge.

An overflow weir is provided on the top of the outer wall of the sulfur bed.

A method for sulfidation and decalcification of granular sludge utilizing the above device, the steps are as follows:

Open the water stop valve, use the mud guide pump to drive the calcified granular sludge into the decalcification area of the reactor through the mud guide pipe, close the water stop valve; set a flow value for the water inlet pump, and when the liquid level in the device continues to rise When it reaches the top of the decalcification zone, adjust the inflow flow rate so that the liquid level rises slowly through the porous filter plate and enters the vulcanization zone; the gas pipeline starts to aerate and enters the sulfur bed through the tubular microporous aeration head, and the sulfur bed Acid production starts, and sulfuric acid liquid flows into the annular acid storage chamber through the overflow weir and accumulates continuously. When the liquid level of the acid storage chamber reaches the upper limit of the controlled liquid level, stop aeration and turn off the water inlet pump; turn on the mixed liquid return pump and acid Liquid reflux pump, when the liquid level in the acid storage chamber reaches the lower limit of the controlled liquid level, turn off the acid reflux pump; keep the mixed liquid reflux so that the sulfuric acid solution can be used multiple times, and the decalcification area is continuously acid-washed and decalcified, and repeated cycle cleaning After that, turn off the mixed liquid return pump, open the water inlet pump and the outlet pipe control valve, discharge the mixed liquid after pickling, and discharge the granular sludge after decalcification through the mud guide pipe to continue the next cycle.

Compared with the prior art, the present invention has beneficial effects: 1. The acid production by sulfidation and the decalcification of granular sludge are integrated, the device has a compact structure, the decalcification operation is convenient, and it is easy to popularize and use; 2. The acid is produced by sulfide bacteria, The cost is low, and the sulfide bacteria can oxidize elemental sulfur into sulfuric acid only by aerating the sulfur granular bed; 3. Dissolving decalcification with acid solution, the acid amount is controllable, which can reduce the damage to granular sludge.

Description of drawings

Figure 1 is a structural diagram of an integrated granular sludge sulfidation and decalcification device;

Figure 2 is a top view of the water distribution area.

In the figure: mud collection area Ⅰ, water distribution area Ⅱ, decalcification area Ⅲ, vulcanization area Ⅳ, circulation area Ⅴ, mud guide pump 1, mud guide pipe 2, water stop valve 3, inverted cone mud collection chamber 4, pH Detection port 5, water distributor 6, granular sludge decalcification reaction chamber 7, sedimentation separation chamber 8, mud-water separator 9, water retaining plate 10, air pipe 11, tubular microporous aeration head 12, porous bottom plate 13, Sulfur bed 14, overflow weir 15, headspace chamber 16, tail gas pipe 17, liquid level control height line of acid storage chamber 18, annular acid storage chamber 19, porous filter plate 20, control valve 21, outlet pipe 22, mixed liquid Return pipe 23, acid liquid return pipe 24, acid liquid return pump 25, mixed liquid return pump 26, water inlet pipe 27, water inlet water pump 28.

Detailed ways

The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, in the integrated granular sludge sulfidation and decalcification device, the main body of the device is divided into sludge collection area I, water distribution area II, decalcification area III and vulcanization area IV from bottom to top, and circulation area V is independent In the main body of the device, it is used to connect the water distribution area II and the decalcification area III, as well as the water distribution area II and the vulcanization area IV. The specific structure of each part is as follows: the mud collecting area I connects the mud guiding water pump 1, the water stop valve 3 and the bottom of the inverted cone mud collecting chamber 4 sequentially through the mud guiding pipe 2 from bottom to top. The water distribution area II is provided with a water inlet pipe 27 and a water distributor 6 from bottom to top, and a water inlet pump 28 is arranged on the water inlet pipe 27 . Three pH detection ports 5 are equidistantly arranged on the side wall of the decalcification area III, and the decalcification area III is divided into a granular sludge decalcification reaction chamber 7 and a sedimentation separation chamber 8 from bottom to top, and a mud-water separator is arranged above the sedimentation separation chamber 8 9. An outlet pipe 22 with a control valve 21 is provided on the side wall of the sulfide decalcification device above the sludge separator 9 . The bottom of vulcanization zone IV is separated from decalcification zone III by a porous filter plate 20 , and the middle part of vulcanization zone IV is wrapped by a cylindrical outer wall without bottom and cover to form a sulfur bed 14 . The sulfur particle bed 14 is filled with elemental sulfur particles, and the decalcification zone III is filled with granular sludge. The bottom of the outer wall of the sulfur bed 14 and the inner wall of the main body of the device are sealed by an annular water retaining plate 10, so that the water below the water retaining plate 10 enters the sulfur bed 14 under the guidance of the water retaining plate 10; An air supply device consisting of a gas delivery pipe 11 and a tubular microporous aeration head 12. A porous bottom plate 13 for supporting sulfur particles is arranged inside the sulfur particle bed 14. A headspace chamber 16 is arranged on the sulfur particle bed 14, and a headspace chamber 16 It is connected with the tail gas pipe 17 for discharging tail gas; the top of the outer wall of the sulfur bed 14 is provided with an overflow weir 15, and the periphery of the sulfur bed 14 is wrapped with an annular acid storage chamber 19 for collecting the sulfuric acid liquid overflowing from the sulfur bed 14 , The annular acid storage chamber 19 can be formed by clamping the outer wall of the sulfur bed 14 and the inner wall of the main body of the device. Circulation area Ⅴ is equipped with acid liquid return pipe 24, acid liquid return pump 25, mixed liquid return pipe 23 and mixed liquid return pump 26, and the upper part of decalcification area III returns to the water distribution area through the mixed liquid return pipe 23 and the mixed liquid return pump 26 II, the annular acid storage chamber 19 is connected to the mixed liquid return pipe 23 through the acid liquid return pipe 24 and the acid liquid return pump 25, and distributed to the decalcification area III through the water distributor 6.

In addition, in the above-mentioned device, the parameters of each component can be set as follows: the volume ratio of mud collection area I, water distribution area II, decalcification area III and vulcanization area IV is 1~1.5:1:8~10:1.5~2 . The bottom of the annular acid storage chamber 19 is equal to the porous bottom plate 13 of the sulfur granule bed, and the height of the acid liquid in the acid storage chamber is controlled at 10% to 30% of the height of the sulfur granule bed. in control. The volume ratio of the sulfur bed 14 and the annular acid storage chamber 19 is 1:0.8-1. In the decalcification area III, the volume ratio of the granular sludge decalcification reaction chamber 7 and the sedimentation separation chamber 8 is 1:0.3-0.4; the included angle between the baffle plate of the mud-water separator 9 and the side wall of the main body of the device is 30°-40° The vertical distance between the outlet pipe 22 in the precipitation separation chamber 8 and the top of the decalcification area III is 5-10 cm; the vertical distance between the pH detection port 5 at the bottom of the decalcification area III and the water inlet pipe 27 is 15-20 cm. The vertical distance between the liquid inlet end of the acid return pipe 24 and the bottom of vulcanization zone IV is 5-10 cm; the vertical distance between the liquid inlet end of the mixed liquid return pipe 23 and the top of the decalcification zone III is 10-15 cm. The vertical distance between the tubular microporous aeration head 12 and the porous bottom plate 13 is 5-10 cm, and the vertical distance between the porous filter plate 20 and the gas delivery pipe is 5-10 cm. The height-to-diameter ratio of the entire granular sludge sulfidation and decalcification device is 5-7:1, the height-to-diameter ratio of the sludge collection area I, water distribution area II and vulcanization area IV is 0.5-1:1, and the height-to-diameter ratio of the decalcification area III The ratio is 3-4:1. The bottom angle of the inverted cone mud collecting chamber 4 is 50°～70°; the vertical distance between the water inlet pipe 27 and the top of the chamber is 5～10cm; The vertical distance is 5-10cm.

In the present invention, the vulcanization zone IV is aerated to supply oxygen, sulfur is oxidized into sulfuric acid by sulfur bacteria, and stored in the annular acid storage chamber 19; the sulfuric acid solution is pumped into the water distribution zone II by means of the acid liquid circulation system, and the sulfuric acid liquid is pumped into the water distribution area II by means of the mixed liquid circulation system , carry out the reflux of the mixed solution in the decalcification zone III, remove the calcium carbonate inside and on the surface of the granular sludge with acid solution, and restore the mass transfer capacity of the granular sludge. The main system work of the present invention is as follows:

Vulcanization zone IV is an acid production system, mainly including porous filter plate 20, water retaining plate 10, air pipe 11, tubular microporous aeration head 12, porous bottom plate 13, sulfur bed 14, annular acid storage room 19, overflow Weir 15, headspace chamber 16, exhaust pipe 17. The rising water flow in the decalcification zone III enters the sulfur granular bed 14 through the porous filter plate 20, and the air enters the sulfur granular bed 14 through the air pipe 11 and the tubular microporous aeration head 12. Under the condition of sufficient oxygen supply, the sulfide bacteria will The elemental sulfur in the sulfur pellet bed 14 is converted to sulfuric acid. The generated acid flows into the annular acid storage chamber 19 through the overflow weir 15, and the bottom of the annular acid storage chamber 19 is provided with an acid return pipe 24, which is used to connect the water distribution area II and the vulcanization area IV.

Decalcification zone III is a granular sludge decalcification system, which mainly includes a granular sludge decalcification reaction chamber 7 , a pH detection port 5 , a sedimentation separation chamber 8 , a mud-water separator 9 and an outlet pipe 22 . The returning sulfuric acid solution and mixed solution uniformly enter the granular sludge decalcification reaction chamber 7 through the water distributor 6 for decalcification reaction, and the sedimentation separation zone 8 performs mud-water separation. The mixed solution after multiple picklings is discharged through the outlet pipe 22, and a pH detector can be installed in the pH detection port 5 to monitor the pH to reflect the working status of the decalcification system.

Water distribution area II is a uniform liquid mixing system, mainly including water inlet pipe 27 and water distributor 6 . The returning sulfuric acid solution and the mixed solution are connected to the water distributor 6, and enter the decalcification area III through the water distributor 6, and the flow adjustment of the reflux pump ensures that the pH of the acid solution entering the decalcification area is controlled to be able to decalcify without decalcification. Within the scope of causing damage to granular sludge.

Sludge collection area I is the input and output system of granular sludge. It mainly includes a mud guide pump 1, a water stop valve 3, a mud guide pipe 2 and an inverted cone mud collection chamber 4. Put the calcified granular sludge into the reactor through the mud guide pipe 2, and close the water stop valve 3; after the granular sludge decalcification treatment, open the water stop valve 3, and use the mud guide water pump 1 to pass the granular sludge through the mud guide pipe 2 discharge.

Circulation area V is an acid liquid recycling system, which mainly includes an acid liquid return pipe 24 , an acid liquid return pump 25 , a mixed liquid return pipe 23 and a mixed liquid return pump 26 . The acid liquid return pipe 24 is used to connect the water distribution area II and the vulcanization area IV, and the mixed liquid return pipe 22 is used to connect the water distribution area II and the decalcification area III.

Based on the above-mentioned device, the present invention also provides an integrated granular sludge sulfide decalcification method, the steps are as follows:

Open the water stop valve 3, use the mud guide pump 1 to drive the calcified granular sludge into the decalcification zone III of the reactor through the mud guide pipe 2, and close the water stop valve 3; the water inlet pump 28 sets a flow value to enter water, when When the liquid level in the device continues to rise to the top of the decalcification zone III, adjust the influent flow rate so that the liquid level rises slowly through the porous filter plate 20 and enters the vulcanization zone IV; 12 into the sulfur grain bed 14, acid production begins in the sulfur grain bed 14, and the sulfuric acid solution flows into the annular acid storage chamber 19 through the overflow weir 15 and accumulates continuously. When the liquid level of the acid storage chamber reaches the upper limit of the control liquid level (about 20%～30% of the sulfur bed height), stop the aeration, and close the inlet water pump 28; open the mixed liquid return pump 26 and the acid liquid return pump 25, until the liquid level in the acid storage chamber 19 reaches the control liquid level When the lower limit (about 10% to 15% of the height of the sulfur bed), close the acid liquid reflux pump 25; keep the mixed liquid reflux so that the sulfuric acid liquid can be used repeatedly, and the decalcification zone III carries out continuous acid elution and decalcification, repeated cycles After cleaning, close the mixed liquid return pump 26, open the water inlet pump 28 and the outlet pipe control valve 21, discharge the mixed liquid after pickling, and discharge the granular sludge after decalcification through the mud guide pipe 2 and continue the next cycle .

Claims (10)

1. An integrated granular sludge vulcanization and decalcification device, characterized in that: the main body of the device is divided into a mud collection area (I), a water distribution area (II), a decalcification area (III) and a vulcanization area ( Ⅳ), the circulation area (Ⅴ) is independent of the main body of the device, and is used to connect the water distribution area (Ⅱ) and the decalcification area (Ⅲ) as well as the water distribution area (Ⅱ) and the vulcanization area (Ⅳ); the mud collection area (Ⅰ) passes through The mud guiding pipe (2) connects the mud guiding water pump (1), the water stop valve (3) and the bottom of the inverted cone mud collecting chamber (4) from bottom to top in sequence; the water distribution area (II) is provided with water inlet pipes from bottom to top (27) and the water distributor (6), the water inlet pipe (27) is provided with the water inlet pump (28); the side wall of the decalcification area (Ⅲ) is provided with several pH detection ports (5), and the decalcification area (Ⅲ) ) is divided into a granular sludge decalcification reaction chamber (7) and a sedimentation separation chamber (8) from bottom to top, a mud-water separator (9) is arranged above the sedimentation separation chamber (8), and the device side above the mud-water separator (9) There is an outlet pipe (22) with a control valve (21) on the wall; the bottom of the vulcanization zone (IV) is separated from the decalcification zone (III) by a porous filter plate (20), and the middle part of the vulcanization zone (IV) is wrapped by a cylindrical outer wall Form sulfur grain bed (14), the outer wall bottom of sulfur grain bed (14) and device main body inner wall are sealed by annular water retaining plate (10), the bottom of sulfur grain bed (14) is arranged by gas delivery pipe (11) and pipe A gas supply device composed of a type microporous aeration head (12), a porous bottom plate (13) for supporting sulfur particles is arranged in the sulfur particle bed (14), and a headspace chamber (16) is arranged above the sulfur particle bed (14). The headspace chamber (16) communicates with the tail gas pipe (17) for exhausting the tail gas; the sulfur bed (14) is surrounded by an annular acid storage chamber (19) for collecting sulfuric acid overflowing from the sulfur bed (14) liquid; the circulation area (Ⅴ) is provided with an acid liquid return pipe (24), an acid liquid return pump (25), a mixed liquid return pipe (23) and a mixed liquid return pump (26), and the upper part of the decalcification area (Ⅲ) passes through the mixed liquid The return pipe (23) and the mixed liquid return pump (26) return to the water distribution area (II), and the annular acid storage chamber (19) leads to the water distribution area through the acid return pipe (24) and the acid return pump (25) (II). 2. The integrated granular sludge sulfidation and decalcification device according to claim 1, characterized in that: the sludge collection area (I), the water distribution area (II), the decalcification area (III) and the vulcanization area ( Ⅳ) The volume ratio is 1-1.5:1:8-10:1.5-2. 3. A kind of integrated granular sludge sulfide decalcification device according to claim 1, characterized in that: the bottom of the annular acid storage chamber (19) is flat with the porous bottom plate (13) of the sulfur bed, and the acid storage chamber The height of the acid solution is controlled at 10%-30% of the height of the sulfur bed; the volume ratio of the sulfur bed (14) to the annular acid storage chamber (19) is 1:0.8-1. 4. The integrated granular sludge sulfide decalcification device according to claim 1, characterized in that: the granular sludge decalcification reaction chamber (7) and the sedimentation separation chamber (8) in the decalcification zone (III) The volume ratio is 1:0.3～0.4; the included angle between the baffle plate of the mud-water separator (9) and the side wall of the main body of the device is 30°～40°; The vertical distance at the top of the calcium zone (Ⅲ) is 5 to 10 cm; the decalcification zone (Ⅲ) is equidistantly provided with three pH detection ports (5) along the height direction, and the pH detection port (5) at the bottom is connected to the water inlet pipe (27) The vertical distance is 15-20cm. 5. The integrated granular sludge vulcanization and decalcification device according to claim 1, characterized in that: the vertical distance between the liquid inlet end of the acid return pipe (24) and the bottom of the vulcanization zone (IV) is 5-5. 10 cm; the vertical distance between the liquid inlet end of the mixed liquid return pipe (23) and the top of the decalcification zone (III) is 10-15 cm. 6. The integrated granular sludge sulfidation and decalcification device according to claim 1, characterized in that: the height-to-diameter ratio of the entire granular sludge sulfide decalcification device is 5-7:1, and the sludge collection area (I), distribution The height-diameter ratio of the water zone (II) and the vulcanization zone (IV) is 0.5-1:1, and the height-diameter ratio of the decalcification zone (III) is 3-4:1. 7. The integrated granular sludge sulfidation and decalcification device according to claim 1, characterized in that: the bottom angle of the inverted conical sludge collection chamber (4) is 50° to 70°, and the water inlet pipe (27) and the top of the chamber The vertical distance is 5-10cm; the vertical distance between the outlet end of the acid return pipe (24) and the mixed liquid return pipe (23) and the water inlet pipe (27) is 5-10cm. 8. The integrated granular sludge sulfide decalcification device according to claim 1, characterized in that: the sulfur granular bed (14) is filled with elemental sulfur particles, and the decalcification zone (III) is filled with granular sludge. 9. The integrated granular sludge sulfidation and decalcification device according to claim 1, characterized in that: an overflow weir (15) is provided on the top of the outer wall of the sulfur granular bed (14). 10. A granular sludge sulfide decalcification method utilizing the device according to claim 1, characterized in that the steps are as follows: Open the water stop valve (3), use the mud guide pump (1) to drive the calcified granular sludge into the decalcification zone (Ⅲ) of the reactor through the mud guide pipe (2), close the water stop valve (3); (28) Set a flow value to feed water. When the liquid level in the device continues to rise to the top of the decalcification zone (Ⅲ), adjust the flow rate of the water intake so that the liquid level rises and enters the vulcanization zone (Ⅳ) through the porous filter plate (20). The air pipe (11) starts to aerate and enters the sulfur bed (14) through the tubular microporous aeration head (12), the sulfur bed (14) begins to produce acid, and the sulfuric acid solution passes through the overflow weir (15) Flow into the annular acid storage chamber (19) and accumulate continuously. When the liquid level of the acid storage chamber reaches the upper limit of the control liquid level, stop the aeration, and close the water inlet pump (28); open the mixed liquid return pump (26) and acid Liquid backflow pump (25), when the liquid level in the acid storage chamber (19) reaches the lower limit of the control liquid level, close the acid liquid backflow pump (25); keep the mixed solution backflow so that the sulfuric acid solution can be used repeatedly, and the decalcification area ( Ⅲ) Carry out continuous pickling to remove calcium. After repeated cleaning cycles, close the mixed solution return pump (26), open the water inlet pump (28) and the outlet pipe control valve (21), and discharge the mixed solution after pickling, except The granular sludge after calcium is discharged through the mud guide pipe (2) and continues to the next round of circulation.