Bioretention medium soil preparation system

Abstract

The utility model discloses a bioretention medium soil preparation system which comprises a gravity concentration device, a sludge plunger pump, a sludge conditioning device, a centrifugal dewatering system, a buffer storage bin, a belt type drying machine, a belt conveying system, a dry material bin and a sludge pelletizer, and an outlet of the gravity concentration device is communicated with an inlet of the sludge conditioning device through the sludge plunger pump. An outlet of the sludge conditioning device is communicated with an inlet of the centrifugal dewatering system, a sludge outlet of the centrifugal dewatering system is communicated with an inlet of the buffer stock bin, an outlet of the buffer stock bin is communicated with an inlet of the belt type drying machine, an outlet of the belt type drying machine is communicated with an inlet of the dry stock bin, and an outlet of the dry stock bin is connected with the sludge granulator. The bioretention medium soil preparation system disclosed by the utility model can effectively remove impurities in sludge water, and bioretention medium soil prepared by the system changes the physical and chemical properties of residual sludge and meets the requirements of resource utilization and deep dehydration; structural arrangement is reasonable, and production cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection equipment, in particular to a bioretention medium soil preparation system. Background Art

[0002] As the demand for urban residential water, industrial production water and other urban water increases year by year, the output of sludge water from water supply plants has also increased significantly. The sludge water from water supply plants comes from the purification process of impurities such as suspended particles and soluble colloids contained in raw water by adding chemical dielectric flocculants (such as aluminum salts or iron salts) and performing coagulation and stirring. It is a general solid waste and a relatively clean and recyclable substance.

[0003] At present, the treatment and resource utilization of sludge water mainly include the preparation of bioretention medium soil, expanded clay and bricks. Under the background of "zero-waste city" and "dual carbon", the use of sludge water for bioretention medium soil has broad market prospects. However, the sludge water from water plants contains a large amount of impurities that are not completely removed and easily cause subsequent treatment equipment to be blocked, and it contains a high amount of water, and the current mechanical dehydration cannot meet the needs of deep dehydration for its resource utilization. At the same time, the residual mud it contains is a polymer mainly composed of clay fine-grained soil, with low organic matter content and poor permeability, which is not conducive to plant growth. Therefore, it is not suitable to be used directly as a raw material for bioretention medium soil. Therefore, it is very necessary to form a set of devices that can remove impurities in sludge water, meet the needs of deep dehydration for resource utilization, and change its physical and chemical properties. Utility Model Content

[0004] The utility model aims to provide a bioretention medium soil preparation system to solve the problems of the existing muddy water with many impurities, high water content and poor permeability proposed in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a biological retention medium soil preparation system, including a gravity thickening device, a sludge plunger pump, a sludge screw pump, a sludge conditioning device, a centrifugal dewatering system, a cache silo, a belt dryer, a belt transmission system, a dry material silo and a sludge granulator, the outlet of the gravity thickening device is connected to the inlet of the sludge conditioning device through the sludge plunger pump, the outlet of the sludge conditioning device is connected to the inlet of the centrifugal dewatering system through a first sludge screw pump, the mud outlet of the centrifugal dewatering system is connected to the inlet of the cache silo, the outlet of the cache silo is connected to the inlet of the belt dryer through a second sludge screw pump, the outlet of the belt dryer is connected to the inlet of the dry material silo through a first belt transmission system, and the outlet of the dry material silo is connected to the sludge granulator through a second belt transmission system.

[0006] Furthermore, the gravity thickening device includes a thickening tank, a material guide cylinder, a first stirring device and a skimmer; the material guide cylinder is arranged at the top middle position in the thickening tank and is connected to the mud inlet pipe of the thickening tank; the first stirring device is arranged in the thickening tank to stir the mud water entering the thickening tank; the skimmer is arranged at the upper part of the thickening tank to remove suspended objects in the mud water.

[0007] Furthermore, an outlet channel for discharging upper layer liquid is provided at the upper portion of the concentration tank, and the outlet channel is connected to the water outlet of the concentration tank.

[0008] Furthermore, the sludge conditioning device includes a conditioning tank, a second stirring device, a PAM dosing device, a biological enzyme dosing device and a solidifying agent dosing device, the second stirring device is used for stirring in the conditioning tank, and the PAM dosing device, the biological enzyme dosing device and the solidifying agent dosing device are respectively connected to the conditioning tank through corresponding diaphragm metering pumps.

[0009] Furthermore, the conditioning tank is a closed steel-concrete structure, and the bottom of the conditioning tank is provided with a slope structure inclined toward the outlet side.

[0010] Furthermore, the mud outlet of the centrifugal dehydration system is communicated with the inlet of the buffer silo, and the liquid outlet of the centrifugal dehydration system is connected to a sewage pipe.

[0011] Furthermore, a hydraulic slide is provided at the bottom of the cache silo and above its outlet, and the hydraulic slide is connected to a hydraulic system provided outside the cache silo.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] (1) The bioretention medium soil preparation system of the utility model includes a gravity thickening device. Through the gravity thickening effect of the sludge conditioning device, large suspended objects such as plastics, plant residues and large gravel in the sludge water can be effectively removed, thereby protecting subsequent processing equipment from damage, reducing equipment failures and maintenance costs, and extending the service life of the equipment.

[0014] (2) The biological retention medium soil preparation system of the utility model is provided with a sludge conditioning device. By adding flocculants, the surface tension of water can be effectively reduced, the thickness of the clay water film can be reduced or the water film can be destroyed, and the sludge flocculation and dehydration effect can be enhanced. By adding curing agents and biological enzymes to the sludge water for biocatalytic modification, the modified sludge water can be made to have the characteristics of easy dehydration, large particles, many pores, good adhesion and strong structure, thereby improving the permeability, stability and adhesion after forming the medium soil.

[0015] (3) The bioretention medium soil preparation system of the utility model includes a centrifugal dehydration system and a belt dryer. The conditioned sludge water is synergistically dehydrated by mechanical dehydration (centrifugal dehydration system) and drying (belt dryer) to enhance the dehydration effect, so that the moisture content of the sludge water is reduced from about 95% to below 40%, thereby reducing the volume of the sludge water, facilitating its use in the preparation of bioretention medium soil and reducing investment.

[0016] (4) The bioretention medium soil preparation system of the utility model ensures the continuity and stability of the production process by setting up a buffer silo to receive the sludge water after mechanical dehydration; and ensures the continuity and stability of the production process by setting up a sludge water drying silo to receive the sludge after drying from the belt dryer for emergency use in equipment maintenance.

[0017] (5) The bioretention medium soil preparation system of the utility model is provided with a belt dryer for drying and dehydrating the sludge water. It has a high processing capacity and can operate continuously to meet the requirements of large-scale and high-efficiency material drying. The equipment has the advantages of easy maintenance, little wear and tear, and low maintenance costs.

[0018] (6) The bioretention medium soil preparation system of the utility model uses a sludge granulator to granulate the dried sludge water to form the desired product.

[0019] (7) The bioretention medium soil preparation system of the utility model can effectively remove impurities in the mud water. The bioretention medium soil prepared by the system changes the physical and chemical properties of the residual mud and meets the deep dehydration requirements for resource utilization. The structure is reasonable, the production cost is low, and the scalability is strong.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is a structural schematic diagram of a preferred embodiment of a bioretention medium soil preparation system of the utility model;

[0023] Among them, 1-gravity thickening device, 1.1-thickening tank, 1.2-material guide cylinder, 1.3-first stirring device, 1.4-skimmer, 1.5-outlet channel, 2-sludge plunger pump, 3-sludge conditioning device, 3.1-conditioning tank, 3.1a-slope structure, 3.2-second stirring device, 3.3-PAM dosing equipment, 3.4-biological enzyme dosing equipment, 3.5-curing agent dosing equipment, 3.6-diaphragm metering pump, 4.1-first sludge screw pump, 4.2-second sludge screw pump, 5-centrifugal dehydration system, 6-buffer silo, 6.1-hydraulic slide, 7-belt dryer, 8.1-first belt transmission system, 8.2-second belt transmission system, 9-drying silo, 10-sludge granulator, 11-hydraulic system. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0025] See also Figure 1 The present embodiment provides a bioretention medium soil preparation system, including a gravity thickening device 1, a sludge plunger pump 2, a sludge conditioning device 3, a centrifugal dehydration system 5, a buffer silo 6, a belt dryer 7, a belt transmission system, a dry material silo 9 and a sludge granulator 10. The outlet of the gravity thickening device 1 is connected to the inlet of the sludge conditioning device 3 through the sludge plunger pump 2, the outlet of the sludge conditioning device 3 is connected to the inlet of the centrifugal dehydration system 5 through the first sludge screw pump 4.1, the mud outlet of the centrifugal dehydration system 5 is connected to the inlet of the buffer silo 6, the outlet of the buffer silo 6 is connected to the inlet of the belt dryer 7 through the second sludge screw pump 4.2, the outlet of the belt dryer 7 is connected to the inlet of the dry material silo 9 through the first belt transmission system 8.1, and the outlet of the dry material silo 9 is connected to the sludge granulator 10 through the second belt transmission system 8.2. The specific structure is as follows:

[0026] The sludge water generated after the raw water is purified enters the gravity thickening device 1, which includes a thickening tank 1.1 of a steel-concrete structure. A material guide cylinder 1.2, a first stirring device 1.3 and a skimmer 1.4 are provided in the thickening tank 1.1. The material guide cylinder 1.2 is arranged at the top middle position in the thickening tank 1.1, and the upper end of the material guide cylinder 1.2 is connected to the mud inlet pipe of the thickening tank 1.1; the first stirring device 1.3 is used to stir the sludge water entering the thickening tank 1.1; the skimmer 1.4 is arranged in the upper part of the thickening tank 1.1, and is used to remove large suspended objects such as plastics, plant residues, and large gravel in the sludge water; at the same time, an outlet channel 1.5 for discharging upper liquid is also provided in the upper part of the thickening tank 1.1, and the outlet channel 1.5 is connected to the outlet of the thickening tank 1.1. After gravity concentration, the sludge water is transported to the sludge conditioning device 3 through the pipeline connected to the sludge plunger pump 2. The sludge conditioning device 3 includes a conditioning tank 3.1, a second stirring device 3.2, a PAM dosing device 3.3, a bio-enzyme dosing device 3.4 and a curing agent dosing device 3.5. The PAM dosing device 3.3, the bio-enzyme dosing device 3.4 and the curing agent dosing device 3.5 are connected to the conditioning tank 3.1 through corresponding diaphragm metering pumps 3.6. In this structural setting, different agents configured in the PAM dosing device 3.3, the bio-enzyme dosing device 3.4 and the curing agent dosing device 3.5 are transported to the conditioning tank 3.1 through the diaphragm metering pump 3.6 according to demand, and the sludge in it is subjected to enhanced flocculation dehydration and biocatalytic solidification treatment. The conditioning tank 3.1 is a closed steel-concrete structure. The bottom of the conditioning tank 3.1 is provided with a slope structure 3.1a inclined toward the outlet side. The second stirring device 3.2 is used to stir in the conditioning tank 3.1, so as to facilitate the uniform contact between the sludge and the conditioning agent, curing agent and bio-enzyme preparation, and facilitate the discharge of the conditioned sludge. A pipeline connected to the first screw pump 4.1 is provided inside the conditioning tank 3.1. The conditioned sludge is sent to the centrifugal dehydration system 5 through the first screw pump 4.1. The mud outlet of the centrifugal dehydration system 5 is connected to the inlet of the buffer silo 6, and the liquid outlet of the centrifugal dehydration system 5 is connected to the sewage pipe; the sludge after centrifugal dehydration is sent to the buffer silo 6, and the separated water in the centrifugal dehydration process is discharged to the nearby sewage well through the sewage pipe. A hydraulic slide 6.1 is provided at the bottom of the buffer silo and above its outlet, and the hydraulic slide 6.1 is connected to a hydraulic system 11 provided outside the buffer silo 6; the sludge in the silo is evenly distributed by providing the hydraulic slide, ensuring continuous and reliable discharge of the bottom unloading facility. The sludge in the buffer silo 6 is sent to the belt drying system 7 through the second sludge screw pump 4.2. After being dried in the belt drying system 7, the sludge is sent to the dry material silo 9 through the first belt transmission system 8.1; the dry material silo 9 adopts a steel structure to provide a safe, dry and reliable storage environment for the dried sludge. The sludge in the dry material silo 9 is sent to the rotary granulator system 10 through the second belt transmission system 8.2, and the sludge is finally processed into bioretention medium particles of the desired shape and size through the extrusion of the granulator system.

[0027] By utilizing the bioretention medium soil preparation system of the utility model, through the process of "concentration and impurity removal + conditioning + mechanical dehydration + drying and dehydration + granulation", the sludge water discharged from the water supply plant is used for the preparation of bioretention medium soil, thereby realizing its resource reuse.

[0028] The system of the utility model is used to prepare biological retention medium soil: first, a gravity concentration device is used to gravity concentrate the sludge water generated by the sedimentation tank, filter tank backwash or clarification tank, and large suspended objects such as plastics, plant residues, and large gravel in the sludge water are removed to form residual sludge with a moisture content between 97.5% and 98.5%. The sludge with a moisture content of 97.5% to 98.5% is conditioned and biocatalytically solidified by a sludge conditioning device to reduce its moisture content to 94% to 96%. The conditioned sludge is mechanically dehydrated and centrifuged to reduce its moisture content from 97.5% to 98.5% to between 75% and 83%. The mechanically dehydrated sludge is dried and dehydrated by a belt drying device to reduce its moisture content to below 40%. The dried sludge water is granulated by a sludge granulator to generate a granular mixed soil with stable physical properties and strong water holding capacity (particle size of 0.3-5mm, comprehensive porosity of 42% to 55%).

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A bioretention medium soil preparation system, characterized in that: The invention comprises a gravity thickening device (1), a sludge plunger pump (2), a sludge conditioning device (3), a centrifugal dewatering system (5), a buffer silo (6), a belt dryer (7), a dry material silo (9) and a sludge granulator (10), wherein the outlet of the gravity thickening device (1) is connected to the inlet of the sludge conditioning device (3) through the sludge plunger pump (2), and the outlet of the sludge conditioning device (3) is connected to the inlet of the centrifugal dewatering system (5) through a first sludge screw pump (4.1). The outlet of the centrifugal dewatering system (5) is connected to the inlet of the buffer silo (6), the outlet of the buffer silo (6) is connected to the inlet of the belt dryer (7) through the second sludge screw pump (4.2), the outlet of the belt dryer (7) is connected to the inlet of the dry material silo (9) through the first belt transmission system (8.1), and the outlet of the dry material silo (9) is connected to the sludge granulator (10) through the second belt transmission system (8.2).

2. The bioretention medium soil preparation system according to claim 1, characterized in that: The gravity thickening device (1) comprises a thickening tank (1.1), a material guide cylinder (1.2), a first stirring device (1.3) and a skimmer (1.4); the material guide cylinder (1.2) is arranged at the top middle position of the thickening tank (1.1) and is connected to the mud inlet pipe of the thickening tank (1.1); the first stirring device (1.3) is arranged in the thickening tank (1.1) and is used to stir the mud discharge water entering the thickening tank (1.1); the skimmer (1.4) is arranged at the upper part of the thickening tank (1.1) and is used to remove suspended objects in the mud discharge water.

3. The bioretention medium soil preparation system according to claim 2, characterized in that: An outlet channel (1.5) for discharging upper layer liquid is provided at the upper part of the concentration tank (1.1); the outlet channel (1.5) is connected to the water outlet of the concentration tank (1.1).

4. The bioretention medium soil preparation system according to claim 1, characterized in that: The sludge conditioning device (3) comprises a conditioning tank (3.1), a second stirring device (3.2), a PAM dosing device (3.3), a biological enzyme dosing device (3.4) and a solidifying agent dosing device (3.5); the second stirring device (3.2) is used for stirring in the conditioning tank (3.1); the PAM dosing device (3.3), the biological enzyme dosing device (3.4) and the solidifying agent dosing device (3.5) are respectively connected to the conditioning tank (3.1) via corresponding diaphragm metering pumps (3.6).

5. The bioretention medium soil preparation system according to claim 4, characterized in that: The conditioning tank (3.1) is a closed steel-concrete structure, and the bottom of the conditioning tank (3.1) is provided with a slope structure (3.1a) inclined toward the outlet side.

6. The bioretention medium soil preparation system according to claim 1, characterized in that: The mud outlet of the centrifugal dehydration system (5) is communicated with the inlet of the buffer silo (6), and the liquid outlet of the centrifugal dehydration system (5) is connected to a sewage pipe.

7. The bioretention medium soil preparation system according to claim 1, characterized in that: A hydraulic slide (6.1) is arranged at the bottom of the buffer silo (6) and above its outlet, and the hydraulic slide (6.1) is connected to a hydraulic system (11) arranged outside the buffer silo (6).

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