High-hardness wastewater treatment aeration pipeline descaling device

Abstract

A high-hardness wastewater treatment aeration pipeline descaling device comprises an aeration hose which is fixed to the bottom of an aerobic tank and connected with a PVC aeration branch pipe, a carbon steel aeration branch pipe, a carbon steel aeration header pipe and a magnetic suspension fan. An acid adding pipeline is further arranged on the carbon steel aeration branch pipe, the acid adding pipeline is connected with the acid solution preparation tank, and an acid adding pump is arranged on a connecting pipeline of the acid adding pipeline and the acid solution preparation tank; the acid solution preparation tank is connected with an industrial hydrochloric acid pipeline and a primary water pipeline, the industrial hydrochloric acid pipeline is provided with a hydrochloric acid pneumatic cut-off valve and a flowmeter, and the primary water pipeline is provided with a primary water pneumatic cut-off valve. By the adoption of the structure, online operation can be achieved, acid liquor adding can be accurately controlled, meanwhile, the efficient descaling purpose of avoiding corrosion of an aeration pipeline is achieved, and the stability and economical efficiency of a waste water treatment system are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a descaling device for aeration pipes in high-hardness wastewater treatment. Background Technology

[0002] In the production process of new coal gasification, the ash water has extremely high hardness (≥1000 mmol / L) and ammonia nitrogen concentration (≥200 mg / L). It is typically pretreated using the lime-soda method or the double-alkali method to reduce hardness before entering the AO process for biochemical treatment. However, such pretreatment methods generate large amounts of solid waste containing calcium carbonate and calcium sulfate, significantly increasing solid waste treatment costs and environmental pressure.

[0003] In the aerobic tank of the AO process, the aeration system supplies oxygen to the activated sludge via a blower to degrade ammonia nitrogen. However, existing technologies have the following problems:

[0004] Severe scaling in aeration hoses: The high hardness of grey water causes rapid carbonate deposition in the micropores of the aeration hoses, clogging the aeration holes and reducing dissolved oxygen transfer efficiency (often below 2 mg / L), threatening the effluent quality to meet standards.

[0005] The energy consumption of the blower surged: after scaling, the aeration resistance increased, and the outlet pressure of the magnetic levitation blower rose from the initial 50 kPa to more than 75 kPa, with the power consumption per unit reaching as high as 1.47 kW·h / t;

[0006] High maintenance costs: Aeration hoses need to be replaced frequently due to scaling (originally every 12 months), and traditional mechanical or chemical cleaning requires downtime, affecting the continuous operation of the system. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide a descaling device for aeration pipes in high-hardness wastewater treatment, which can achieve online operation, precise control of acid addition, and efficient descaling while avoiding corrosion of aeration pipes, thus ensuring the stability and economy of the wastewater treatment system.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a descaling device for aeration pipes in high-hardness wastewater treatment, including an aeration hose, which is fixed to the bottom of the aerobic tank and connected to a PVC aeration branch pipe, a carbon steel aeration branch pipe, a carbon steel aeration main pipe and a magnetic levitation fan.

[0009] The carbon steel aeration branch pipe is also equipped with an acid addition pipe, which is connected to an acid solution preparation tank. An acid addition pump is installed on the connecting pipe between the acid addition pipe and the acid solution preparation tank.

[0010] The acid solution preparation tank is connected to an industrial hydrochloric acid pipeline and a primary water pipeline. The industrial hydrochloric acid pipeline is equipped with a hydrochloric acid pneumatic shut-off valve and a flow meter, and the primary water pipeline is equipped with a primary water pneumatic shut-off valve.

[0011] In a preferred embodiment, the magnetic levitation fan drives dilute acid from the carbon steel aeration branch pipe into the aeration hose via pressurized air for descaling.

[0012] In a preferred embodiment, the aerobic tank is a reinforced concrete-lined fiberglass water tank, and the connection point between the acid addition pipe and the carbon steel aeration branch pipe is located on the upper part of the cover plate of the aerobic tank.

[0013] In a preferred embodiment, the acid-adding pipeline is connected to the carbon steel aeration branch pipe via flanges and a stainless steel acid-adding valve. The stainless steel acid-adding valve is located between two flanges. The acid-adding pipeline between the flanges and the acid-adding pump is a PPR hot-melt pipeline, and the acid-adding pipeline between the flanges and the PVC aeration branch pipe is a stainless steel acid-adding pipeline.

[0014] In a preferred embodiment, the stainless steel acid-adding pipeline and the stainless steel acid-adding valve are connected by a flange, and the stainless steel acid-adding pipeline is welded with a flange inside.

[0015] In a preferred embodiment, the acid solution preparation tank is equipped with a level gauge and a stirrer;

[0016] The mixer, acid pump, primary water pneumatic shut-off valve, and level gauge are interlocked to enable shutdown and valve closure in case of abnormal liquid level.

[0017] In a preferred embodiment, the acid pump is a pneumatic diaphragm pump.

[0018] The descaling device for aeration pipes in high-hardness wastewater treatment provided by this utility model, by adopting the above-described structure, has the following beneficial effects:

[0019] (1) By regularly turning on the descaling device of the aeration pipe every month to add acid, the scaling phenomenon in the aeration hose can be effectively reduced. After practical application, the service life of the aeration hose has been significantly extended from the original 12 months to 21 months. In addition, it can also reduce the pressure of the aeration pipe by 3-5 kPa, ensuring the stable operation of the system and reducing the risk of increased blower outlet pressure and increased energy consumption caused by scaling.

[0020] (2) The method of using a magnetic levitation fan in conjunction with dilute acid to clean the aeration hose not only effectively reduces the internal resistance of the system, but also reduces the power consumption of wastewater treatment.

[0021] (3) The acid solution preparation tank is equipped with pneumatic valves on the primary water pipeline and the industrial hydrochloric acid pipeline. Combined with the application of a level gauge, it realizes remote and precise control of the acid solution preparation process, reducing the risk of manual operation. At the same time, the acid pump is a pneumatic diaphragm pump, which not only helps to save energy consumption, but also reduces the possibility of leakage caused by corrosion, thereby improving the safety and working efficiency of the entire system. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] In the diagram: 1. Aeration hose; 2. Aerobic tank; 3. PVC aeration branch pipe; 4. Carbon steel aeration branch pipe; 5. Carbon steel aeration main pipe; 6. Magnetic levitation fan; 7. Acid addition pipe; 8. Acid addition pump; 9. Acid solution preparation tank; 10. Stainless steel acid addition valve; 11. Stainless steel acid addition pipe; 12. Industrial hydrochloric acid pipe; 13. Hydrochloric acid pneumatic shut-off valve; 14. Primary water pipe; 15. Primary water pneumatic shut-off valve; 16. Level gauge; 17. Mixer; 18. Flow meter. Detailed Implementation

[0025] like Figure 1 In the present invention, a descaling device for aeration pipes in high-hardness wastewater treatment is characterized in that: it includes an aeration hose 1, which is fixed at the bottom of an aerobic tank 2 and connected to a PVC aeration branch pipe 3, a carbon steel aeration branch pipe 4, a carbon steel aeration main pipe 5 and a magnetic levitation fan 6.

[0026] The carbon steel aeration branch pipe 4 is also equipped with an acid addition pipe 7, which is connected to an acid solution preparation tank 9. An acid addition pump 8 is installed on the connection pipe between the acid addition pipe 7 and the acid solution preparation tank 9.

[0027] The acid solution preparation tank 9 is connected to an industrial hydrochloric acid pipeline 12 and a primary water pipeline 14. The industrial hydrochloric acid pipeline 12 is equipped with a hydrochloric acid pneumatic shut-off valve 13 and a flow meter 18, and the primary water pipeline 14 is equipped with a primary water pneumatic shut-off valve 15.

[0028] In a preferred embodiment, the magnetic levitation fan 6 drives the dilute acid in the carbon steel aeration branch pipe 4 into the aeration hose 1 through pressurized air for descaling.

[0029] In the preferred embodiment, the aerobic tank 2 is a reinforced concrete-lined fiberglass water tank, and the connection point between the acid addition pipe 7 and the carbon steel aeration branch pipe 4 is located on the upper part of the cover plate of the aerobic tank 2.

[0030] In a preferred embodiment, the acid-adding pipe 7 is connected to the carbon steel aeration branch pipe 4 via a flange and a stainless steel acid-adding valve 10. The stainless steel acid-adding valve 10 is located between two flanges. The acid-adding pipe 7 between the flange and the acid-adding pump 8 is a PPR hot-melt pipe, and the acid-adding pipe 7 between the flange and the PVC aeration branch pipe 3 is a stainless steel acid-adding pipe 11.

[0031] In a preferred embodiment, the stainless steel acid-adding pipe 11 and the stainless steel acid-adding valve 10 are connected by a flange, and the stainless steel acid-adding pipe 11 is welded with a flange inside.

[0032] In a preferred embodiment, the acid solution preparation tank 9 is equipped with a level gauge 16 and a stirrer 17;

[0033] The mixer 17, acid pump 8, primary water pneumatic shut-off valve 15 and level gauge 16 are interlocked to achieve shutdown and valve closure when the liquid level is abnormal.

[0034] In a preferred embodiment, the acid pump 8 is a pneumatic diaphragm pump.

[0035] The present invention discloses a descaling device for aeration pipes in high-hardness wastewater treatment, which, when performing descaling operations on aeration pipes in high-hardness wastewater treatment:

[0036] When the outlet pressure of the magnetic levitation fan 6 rises to above 75 kPa or the online dissolved oxygen meter in the aerobic tank 2 shows dissolved oxygen below 2 mg / L, the descaling device in the aeration pipeline will start adding acid.

[0037] Turn on the agitator 17, the pneumatic shut-off valve 15 for primary water, and the pneumatic shut-off valve 14 for hydrochloric acid to prepare 3% dilute hydrochloric acid. Calculate the flow rate of hydrochloric acid to be added based on the volume of the acid solution preparation tank 9. Set the flow rate of hydrochloric acid to the hydrochloric acid flow meter 18 as needed and interlock to close the pneumatic shut-off valve 14 for hydrochloric acid.

[0038] After the dilute acid solution is prepared, turn on the acid pump 8 and open the stainless steel acid valve 10 on the aerobic tank 2. To ensure the acid addition effect, two stainless steel acid valves on the aerobic tank are opened each time, and the valves are switched during on-site inspections. Each carbon steel aeration main pipe 5 has ten carbon steel aeration branch pipes 4. The carbon steel aeration branch pipes 4 are connected to the normal operating water level of the aerobic tank 2 and are flanged to the PVC aeration branch pipe 3. In order to reduce the corrosion of the carbon steel aeration branch pipes 4 by hydrochloric acid, 11 stainless steel acid adding pipes are inserted into the PVC aeration branch pipes 3. Descaling and acid adding to the aeration pipes must be carried out when the magnetic levitation blower 6 is turned on.

Claims

1. A descaling device for aeration pipelines in high-hardness wastewater treatment, characterized in that: It includes an aeration hose (1), which is fixed to the bottom of the aerobic tank (2) and connected to a PVC aeration branch pipe (3), a carbon steel aeration branch pipe (4), a carbon steel aeration main pipe (5) and a magnetic levitation blower (6). The carbon steel aeration branch pipe (4) is also provided with an acid addition pipe (7), which is connected to the acid solution preparation tank (9). An acid addition pump (8) is provided on the connection pipe between the acid addition pipe (7) and the acid solution preparation tank (9). The acid solution preparation tank (9) is connected to an industrial hydrochloric acid pipeline (12) and a primary water pipeline (14). The industrial hydrochloric acid pipeline (12) is equipped with a hydrochloric acid pneumatic shut-off valve (13) and a flow meter (18), and the primary water pipeline (14) is equipped with a primary water pneumatic shut-off valve (15).

2. The descaling device for aeration pipelines in high-hardness wastewater treatment according to claim 1, characterized in that: The magnetic levitation fan (6) drives the dilute acid in the carbon steel aeration branch pipe (4) into the aeration hose (1) for descaling by pressurizing air.

3. The descaling device for aeration pipelines in high-hardness wastewater treatment according to claim 1, characterized in that: The aerobic tank (2) is a fiberglass water tank with a reinforced concrete lining. The connection point between the acid addition pipe (7) and the carbon steel aeration branch pipe (4) is located on the upper part of the cover plate of the aerobic tank (2).

4. The descaling device for aeration pipelines in high-hardness wastewater treatment according to claim 1, characterized in that: The acid-adding pipe (7) is connected to the carbon steel aeration branch pipe (4) through a flange and a stainless steel acid-adding valve (10). The stainless steel acid-adding valve (10) is set between two flanges. The acid-adding pipe (7) between the flange and the acid-adding pump (8) is a PPR hot-melt pipe, and the acid-adding pipe (7) between the flange and the PVC aeration branch pipe (3) is a stainless steel acid-adding pipe (11).

5. The descaling device for aeration pipelines in high-hardness wastewater treatment according to claim 4, characterized in that: The stainless steel acid-adding pipe (11) and the stainless steel acid-adding valve (10) are connected by a flange, and the stainless steel acid-adding pipe (11) is welded with a flange inside.

6. The descaling device for aeration pipelines in high-hardness wastewater treatment according to claim 1, characterized in that: The acid solution preparation tank (9) is equipped with a level gauge (16) and a stirrer (17). The mixer (17), acid pump (8), primary water pneumatic shut-off valve (15) and level gauge (16) are interlocked to achieve shutdown and valve closure when the level is abnormal.

7. The descaling device for aeration pipelines in high-hardness wastewater treatment according to claim 1, characterized in that: The acid pump (8) is a pneumatic diaphragm pump.

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