Limnodrilus hoffmeisteri sludge reduction equipment with internal membrane aeration filler structure and sludge reduction method

Abstract

The invention discloses limnodrilus sludge reduction equipment with an internal membrane aeration filler structure and a sludge reduction method, and relates to the field of sewage sludge treatment.The limnodrilus sludge reduction equipment comprises a treatment box, a limnodrilus filler column, a sludge mixing system, a feeding and discharging system, a water quality monitoring system, the internal membrane aeration filler structure and an intelligent regulation and control system; by means of the method, uniform aeration in the filler can be achieved, the oxygen utilization rate is remarkably increased, energy consumption is reduced, sufficient and uniform dissolved oxygen conditions are provided for limnodrilus hoffmeisteri, growth of the limnodrilus hoffmeisteri is facilitated, and the ingestion activity of the limnodrilus hoffmeisteri is improved; through the automatic intelligent monitoring control method, the equipment can dynamically adjust the operation state in real time according to the water quality parameters, so that the accurate control of the sludge treatment process is realized, the sludge reduction efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of sewage sludge treatment, and in particular to a water silkworm sludge reduction device with an internal membrane aeration filler structure and a control method thereof. Background Art

[0002] With the continuous acceleration of the global industrialization and urbanization process, the amount of sewage discharge has shown a rapid growth trend. The proper treatment of residual sludge is an important link in the sewage treatment process. Traditional sludge treatment technologies such as landfill and incineration not only have high investment costs and high energy consumption, but are also very likely to cause secondary pollution. The development of clean and efficient residual sludge treatment technology has always been a key problem that needs to be overcome in the industry.

[0003] In recent years, biological treatment technology using microorganisms to reduce sludge has gradually become a research hotspot, among which water silkworms have attracted much attention for their efficient sludge decomposition ability. However, existing related equipment generally has aeration system design defects, resulting in uneven aeration and strong aeration disturbance, making it difficult for water silkworms to stably attach, grow and reproduce on the filler, which seriously affects the sludge reduction effect; at the same time, the existing equipment lacks effective monitoring and control means, making it difficult to adjust the operating parameters in time according to the system sludge properties and changes in the treatment process, resulting in low operating efficiency.

[0004] Therefore, developing new earthworm sludge reduction equipment and its control method, and utilizing the internal membrane aeration filler structure design and intelligent monitoring and control system to achieve efficient and stable sludge reduction treatment are of great significance to the research on residual sludge treatment technology. Summary of the invention

[0005] The purpose of the present invention is to provide a water silkworm sludge reduction device with an internal membrane aeration filler structure and a control method thereof, so as to achieve long-term stable attachment operation of the water silkworm and efficient sludge reduction.

[0006] The present invention discloses a water worm sludge reduction device with an internal membrane aeration filler structure, the device comprising a treatment box, a water worm filler column, a sludge mixer, a sludge return pipe, a sludge inlet pipe, a sludge outlet pipe, a water quality monitoring device, an air inlet pipe, an air inlet pump, a water inlet pump, a water outlet pump, a membrane aeration component, a filler platform, a sludge return branch pipe and a water collection tank;

[0007] A plurality of tubificidae filler columns are horizontally arranged in the treatment box body. A plurality of filler platforms are arranged on the outer part of the tubificidae filler columns from top to bottom. A membrane aeration component is arranged inside the tubificidae filler columns. An air inlet pump is communicated with the membrane aeration component through an air inlet pipe. A water quality monitoring device is arranged between the tubificidae filler columns. The sludge return pipe is composed of a horizontal sludge return branch pipe at the bottom of the treatment box body and a vertical sludge return branch pipe inside the treatment box body. The outlet of the sludge mixer is communicated with the inlet of the sludge return pipe. A water inlet pipe is laid at the bottom of the pool of the treatment box body. The outlet of the water inlet pump is communicated with the water inlet pipe. A water collection tank is arranged in the upper right of the treatment box body. The outlet of the water outlet pump is communicated with the water collection tank. The outlet of the sludge discharge pipe is communicated with the water collection tank.

[0008] Further, the tubificidae filler column is composed of an outer layer filler and an inner layer membrane aeration component.

[0009] Further, the outer layer filler is composed of two hollow semi-cylinders that can be opened and closed. The material of the outer layer filler is a multi-aperture polyamide / polyethylene fiber porous material, adopting a multi-layer nested grid-like structure. The filler particle size is 80 - 250 mesh. It provides attachment growth conditions for tubificidae. At the same time, the filler platforms are laid at intervals outside the filler to intercept some shed tubificidae and increase the sludge load of the filler column.

[0010] Further, the material of the inner layer membrane aeration component is polyvinylidene fluoride, polypropylene or silicone resin. The inner layer membrane aeration component has good chemical stability and mechanical strength. The aeration pipeline is communicated with the aeration membrane to introduce air into the aeration membrane. The micropore diameter of the aeration membrane is 0.01 - 0.2 um. This microporous structure can make the air be evenly released into the sludge in the form of tiny bubbles, realizing low disturbance and uniform aeration, and providing a stable and suitable dissolved oxygen environment for tubificidae.

[0011] Further, the tubificidae filler column can be disassembled and combined separately. The area of the inner layer membrane aeration component is adjusted according to the size of the treatment box body and the sludge treatment volume.

[0012] Further, the sludge mixer operates intermittently, and the operation frequency is 12 - 24 times per day. It is used to mix the sludge in the box and update the sludge on the filler column, providing a good food environment for tubificidae. At the same time, the sludge mixing disturbance is used to stimulate tubificidae to adhere more tightly to the filler.

[0013] Further, the water quality monitoring device is a dissolved oxygen sensor or a sludge concentration sensor. The system control device is connected with the water quality monitoring device. The control system of the system control device adopts a programmable logic controller (PLC), and automatically adjusts the air intake volume of the membrane aeration pipeline and the sludge mixing frequency according to the monitoring information.

[0014] The method for sludge reduction using the sludge reduction equipment with an internal membrane aeration filler structure of the present invention is carried out according to the following steps:

[0015] The sludge mixture enters the treatment box through the inlet pipe by the inlet water pump. While feeding, the sludge mixture in the treatment box overflows into the collecting tank and is discharged from the treatment box through the outlet pipe and the outlet water pump; during the reaction of the sludge mixture in the treatment box, the sludge mixer is intermittently started to make the mud and water in the treatment box evenly mixed, update the excrement of Limnodrilus hoffmeisteri on the packing at the same time, and give a certain external stimulus to promote the feeding of Limnodrilus hoffmeisteri. The excess sludge is discharged from the outlet pipe according to the sludge retention time of 2-3 days.

[0016] Further, the sludge mixture is fecal sewage, return sludge or excess sludge from a sewage treatment plant; the concentration of the sludge mixture is 3000-8000 mg / L.

[0017] Further, the inoculation density of Limnodrilus hoffmeisteri in the Limnodrilus hoffmeisteri packing column is 500-1200 g / m 2 , and after the equipment is initially fed for 1-3 days, periodic feeding and discharging operations are carried out to prevent the loss of initially inoculated Limnodrilus hoffmeisteri.

[0018] The present invention has the following beneficial effects:

[0019] (1) A novel internal membrane aeration packing column is proposed. Compared with the traditional external aeration method of the packing, uniform aeration inside the packing is realized, the oxygen utilization rate is significantly improved, energy consumption is saved, sufficient and uniform dissolved oxygen conditions are provided for Limnodrilus hoffmeisteri, which is beneficial to the growth of Limnodrilus hoffmeisteri and improves the feeding activity of Limnodrilus hoffmeisteri;

[0020] (2) A Limnodrilus hoffmeisteri packing with a columnar structure with a platform is proposed, which is conducive to the full mixing of sludge in the system, significantly improves the update rate of the excrement of Limnodrilus hoffmeisteri on the packing, and creates fresh food conditions for Limnodrilus hoffmeisteri.

[0021] (3) A Limnodrilus hoffmeisteri sludge reduction device with an internal membrane aeration packing structure and its control method are proposed. Through an automated intelligent monitoring and control method, the equipment can dynamically adjust the operating state according to water quality parameters in real time, realize precise control of the sludge treatment process, improve the sludge reduction efficiency, and reduce labor costs. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of a Limnodrilus hoffmeisteri sludge reduction device with an internal membrane aeration packing structure according to the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the Limnodrilus hoffmeisteri packing column according to the present invention. Detailed Embodiments

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer and more understandable, the spirit of the content disclosed by the present invention will be described in detail below. After any person skilled in the relevant technical field understands the embodiments of the content of the present invention, they can make changes and modifications based on the technology taught by the content of the present invention, which do not depart from the spirit and scope of the content of the present invention.

[0025] The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0026] The beneficial effects of the present invention are verified through the following embodiments:

[0027] Embodiment 1

[0028] A limnodrilus hoffmeisteri sludge reduction device with an internal membrane aeration packing structure in this embodiment includes a treatment box body 1, a limnodrilus hoffmeisteri packing column 2, a sludge mixer 3, a sludge return pipe 4, a sludge inlet pipe 5, a sludge outlet pipe 6, a water quality monitoring device 7, an air inlet pipe 9, an air inlet pump 10, a water inlet pump 11, a water outlet pump 12, a membrane aeration assembly 13, a packing platform 14, a sludge return branch pipe 15, and a water collection tank 16;

[0029] A plurality of limnodrilus hoffmeisteri packing columns 2 are horizontally arranged in the treatment box body 1. The limnodrilus hoffmeisteri packing column 2 is composed of an outer packing and an inner membrane aeration assembly 13. The outer packing is composed of two hollow semi-cylinders that can be opened and closed. The material of the outer packing is a multi-aperture polyamide / polyethylene fiber porous material, adopting a multi-layer nested grid-like structure, and the packing particle size is 80-250 mesh. The material of the inner membrane aeration assembly 13 is polyvinylidene fluoride, polypropylene or silicone resin, and the micropore diameter of the aeration membrane is 0.01-0.2 um. The limnodrilus hoffmeisteri packing column 2 can be disassembled and combined separately, and the area of the inner membrane aeration assembly 13 is adjusted according to the size of the treatment box body 1 and the sludge treatment capacity. A plurality of packing platforms 14 are arranged on the outside of the limnodrilus hoffmeisteri packing column 2 from top to bottom. The membrane aeration assembly 13 is arranged inside the limnodrilus hoffmeisteri packing column 2. The air inlet pump 10 is connected to the membrane aeration assembly 13 through the air inlet pipe 9. The water quality monitoring device 7 is arranged between the limnodrilus hoffmeisteri packing columns 2. The sludge return pipe 4 is composed of a horizontal sludge return branch pipe 15 at the bottom of the treatment box body 1 and a vertical sludge return branch pipe 15 inside the treatment box body 1. The outlet of the sludge mixer 3 is connected to the inlet of the sludge return pipe 4. A water inlet pipe is laid on the bottom of the treatment box body 1, and the outlet of the water inlet pump 11 is connected to the water inlet pipe. The water collection tank 16 is arranged in the upper right of the treatment box body 1. The outlet of the water outlet pump 12 is connected to the water collection tank 16, and the outlet of the sludge outlet pipe 6 is connected to the water collection tank 16.

[0030] The sludge in the sludge return pump house of Harbin Taiping Sewage Treatment Plant is pumped into the treatment tank through the inlet pipe by the feed water pump. After the feeding is completed, the sludge circulator is started intermittently, so that the muddy water mixture at the bottom of the treatment tank is mixed in the equipment through the sludge return pipe. The excess sludge is discharged from the outlet pipe according to the sludge retention time of 2-3 days. The Limnodrilus hoffmeisteri grows stably, and the sludge reduction effect of the reaction is improved by 30%-50% compared with the traditional reactor, and the aeration energy consumption is reduced by 40%, realizing the long-term stable and efficient operation of the equipment.

Claims

1. A water silkworm sludge reduction device with an internal membrane aeration filler structure, characterized in that The equipment comprises a treatment box (1), a water worm filler column (2), a sludge mixer (3), a sludge return pipe (4), a sludge inlet pipe (5), a sludge outlet pipe (6), a water quality monitoring device (7), an air inlet pipe (9), an air inlet pump (10), a water inlet pump (11), a water outlet pump (12), a membrane aeration component (13), a filler platform (14), a sludge return branch pipe (15) and a water collection tank (16); A plurality of water worm packing columns (2) are arranged transversely in the treatment box (1); a plurality of packing platforms (14) are arranged on the outside of the water worm packing columns (2) from top to bottom; a membrane aeration assembly (13) is arranged inside the water worm packing columns (2); an air intake pump (10) is connected to the membrane aeration assembly (13) via an air intake pipe (9); and a water quality monitoring device (7) is arranged between the water worm packing columns (2); a sludge return pipe (4) is connected to the sludge return pipe (14) at the bottom of the treatment box (1) via a transverse sludge return pipe (14) at the bottom of the treatment box (1). The invention relates to a sludge return pipe (4) and a branch pipe (15) and a vertical sludge return branch pipe (15) in the treatment box (1); the outlet of the sludge mixer (3) is connected to the inlet of the sludge return pipe (4); a water inlet pipe is laid on the bottom of the treatment box (1); the outlet of the water inlet pump (11) is connected to the water inlet pipe; a water collecting tank (16) is arranged at the upper right of the treatment box (1); the outlet of the water outlet pump (12) is connected to the water collecting tank (16); and the outlet of the mud outlet pipe (6) is connected to the water collecting tank (16).

2. The water silkworm sludge reduction equipment with internal membrane aeration filler structure according to claim 1 is characterized in that The water worm filler column (2) consists of an outer layer of filler and an inner layer of membrane aeration components (13).

3. The water silkworm sludge reduction equipment with internal membrane aeration filler structure according to claim 2 is characterized in that The outer filler is composed of two openable hollow semi-cylinders. The outer filler is made of multi-pore polyamide / polyethylene fiber porous material, adopts a multi-layer nested grid structure, and the filler particle size is 80-250 meshes.

4. The water silkworm sludge reduction equipment with internal membrane aeration filler structure according to claim 1 or 2, characterized in that The inner membrane aeration component (13) is made of polyvinylidene fluoride, polypropylene or silicone resin, and the micropore diameter of the aeration membrane is 0.01-0.2um.

5. The water silkworm sludge reduction equipment with internal membrane aeration filler structure according to claim 1 is characterized in that The water worm filler column (2) can be disassembled and assembled separately, and the area of ​​the inner membrane aeration component (13) is adjusted according to the size of the treatment box (1) and the sludge treatment capacity.

6. The water silkworm sludge reduction equipment with internal membrane aeration filler structure according to claim 1 is characterized in that The sludge mixer (3) is operated intermittently, with an operating frequency of 12-24 times per day.

7. The water silkworm sludge reduction equipment with internal membrane aeration filler structure according to claim 1 is characterized in that The water quality monitoring device (7) is a dissolved oxygen sensor or a sludge concentration sensor, and the system control device (8) is connected to the water quality monitoring device (7).

8. A method for reducing sludge using the water silkworm sludge reduction device with an internal membrane aeration filler structure according to claim 1, characterized in that It is carried out according to the following steps: The sludge mixture enters the treatment box (1) through the water inlet pipe via the water inlet pump (11). While feeding, the sludge mixture in the treatment box (1) overflows to the sump (16) and is discharged from the treatment box (1) via the water outlet pipe and the water outlet pump (12). During the reaction of the sludge mixture in the treatment box (1), the sludge mixer (3) is started intermittently to mix the mud and water in the treatment box (1) evenly and to update the excrement of the water silkworm on the filler. The remaining sludge is discharged from the water outlet pipe according to the sludge retention time of 2-3 days.

9. The method for reducing sludge of a water silkworm sludge reduction device with an internal membrane aeration filler structure according to claim 8, characterized in that The sludge mixture is fecal sewage, return sludge from a sewage treatment plant or excess sludge; the concentration of the sludge mixture is 3000-8000 mg / L.

10. The method for reducing sludge of a water silkworm sludge reduction device with an internal membrane aeration filler structure according to claim 8, characterized in that Water silkworm packing column (2) Water silkworm inoculation density is 500-1200g / m 2 The equipment will be fed for the first time for 1-3 days before periodic feeding and discharging operation.

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