CN205275438U - Improve sludge dewatering system - Google Patents

Abstract

The utility model discloses an improved sludge dewatering system, which comprises a water feeding device, a dewatering device, a conveying device, a sludge storage box, a hydraulic system and a control system, wherein the water feeding device is formed by driving a pneumatic diaphragm by an air compressor, the dewatering device is arranged on a bracket, one end of the bracket is welded with a funnel, the conveying device is arranged below the funnel, the sludge storage box is arranged at one end of the conveying device, and one side of the bracket is also provided with an observation platform; a hydraulic cylinder in the hydraulic system drives a dehydration device, and an electromagnetic relay valve is arranged to set the pressure of an oil way; the control system adopts PLC control to realize the start and stop of the pump, the pressing of the dewatering set and the start and stop of the conveying device. The sludge dewatering system has the advantages of small equipment floor area, no need of foundation facilities, economic and reliable operation, capability of automatically adjusting the water inflow according to the pressure in the compartment body, no sewage overflow phenomenon and high automation degree.

Description

An improved sludge dewatering system

technical field

The utility model relates to the technical field of sludge sewage treatment equipment, in particular to an improved sludge dewatering system.

Background technique

The sludge produced by sewage treatment has a high water content. Due to the combination of water and sludge particles, mechanical removal has certain limitations. It has an important influence on the final solid content. Generally speaking, the solid content of 20%-30% can be obtained by mechanical dehydration, and the formed sludge is also called mud cake. The water content of the mud cake is still high and has a fluid nature, and its disposal is still difficult and costly, so further reduction is necessary. At this time, in addition to natural air drying, only through the input of heat to form evaporation can a large-scale weight reduction be achieved. Drying with heat is thermal drying. Common sludge treatment methods are as follows:

(1) Natural air-drying method, the main structure is the sludge drying field, a flat land surrounded and separated by earth embankments, if the soil has poor water permeability, a thin layer of gravel and sand can be laid, and a hidden drainage pipe can be installed. Rely on infiltration and evaporation to reduce the water content of the sludge discharged to the field. The infiltration process takes about 2 to 3 days to complete, and the moisture content can be reduced to about 85%. After that, it mainly depends on evaporation, which can drop to about 75% after a few weeks. The dehydration effect of the sludge drying plant is affected by the local rainfall, evaporation, temperature, humidity, etc. Generally suitable for use in dry, less rainy, sandy soil areas.

(2) Granulation dehydration method, water granulation dehydration machine is a new equipment developed. Its main body is a horizontal cylinder made of steel plate, which is divided into granulation section, dehydration section and compaction section, and slowly rotates around the horizontal axis. The sludge after adding the polymer coagulant first enters the granulation section, and under the action of the sludge's own gravity, it is flocculated and compressed, and rolled into mud pellets in layers, and then the sludge pellets and water enter the dehydration section, and the water is discharged from the ring direction Discharge in diagonal seam. Finally, it enters the compaction section, where the pellets are further compressed and dehydrated under their own weight to form large and dense pellets, which are pushed out of the cylinder. The granulator has a simple structure, is not easy to wear, has low power consumption, and is easy to maintain. The moisture content of mud pellets is generally around 70%. The filtrate produced during the sludge dehydration process of the sewage plant contains high concentrations of pollutants except for the filtrate of the drying bed, which has less pollutant content. These filtrates must therefore be treated, generally with the influent wastewater.

(3) Mechanical dehydration method, usually the sludge is pretreated first to improve the dehydration performance before dehydration. The most common pretreatment method is to add inorganic salt or polymer coagulant. In addition, there are elutriation and heat treatment. Mechanical dehydration methods include filtration and centrifugation. Filtration is to filter the wet sludge with a filter layer (porous material such as filter cloth, wire mesh), so that the water (filtrate) permeates the filter layer, and the dewatered sludge (filter cake) is trapped on the filter layer. The centrifugation method achieves the separation of mud and water by means of different centrifugal tendencies produced by the difference in specific gravity between solid and liquid in the sludge. The equipment used in the filtration method includes vacuum filters, plate and frame filter presses and belt filters. The vacuum filter continuously enters mud and continuously discharges mud, and operates smoothly, but there are many auxiliary facilities. Plate and frame filter press is a common equipment in chemical industry. It has high filtration driving force, low moisture content of mud cake, intermittent mud feeding and mud discharging, and low productivity. The manual operation of the plate and frame filter press is very labor-intensive, and most of them are replaced by mechanical automatic operation. The belt filter is a new type of filter, with various designs, based on different dehydration principles (gravity filtration, pressure filtration, capillary water absorption, granulation), but they all have a rotary belt, which transports mud while dehydrating, or It only has the effect of transporting mud. They are similar in complexity and energy consumption. A horizontal high-speed sedimentation centrifugal dehydrator is commonly used in centrifugation, which is composed of an inner and outer drum. One end of the drum is cylindrical and the other end is conical. The speed is generally around 3000 rpm or higher, and there is a certain speed difference between the inner and outer drums. The continuous production and automatic control of the centrifugal dehydrator have good sanitary conditions and a small footprint, but the requirements for sludge pretreatment are relatively high. Mechanical dehydration is mainly used for primary sedimentation tank sludge and digested sludge. The moisture content of the dewatered sludge is related to the properties of the sludge and the dehydration method. Under normal circumstances, the moisture content of mud cake for vacuum filtration is 60% to 80%, that of plate and frame filter press is 45% to 80%, and that of centrifugal dehydration is 80%. to eighty-five percent.

Contents of the invention

The purpose of the invention of the utility model is to overcome the deficiencies of the prior art methods and provide a device with a small footprint, no need for foundation facilities, economical and reliable operation, the ability to automatically adjust the water intake according to the pressure in the compartment, no sewage overflow, and automatic A high degree of improved sludge dewatering system.

In order to realize the above-mentioned purpose of the invention, following technical scheme is proposed:

An improved sludge dewatering system, including a water supply device, a dehydration device, a conveying device, a mud storage tank, a hydraulic system, and a control system. The water supply device is an air compressor driving a pneumatic diaphragm, and the dehydration device is installed on a bracket. One end of the support is welded with a funnel, the conveying device is placed under the funnel, the mud storage box is placed at one end of the conveying device, and an observation platform is provided on one side of the support; the hydraulic cylinder drives the dehydration device in the hydraulic system, and the electromagnetic relay is installed. The electric valve is used to set the pressure of the oil circuit; the control system adopts PLC control to realize the start and stop of the pump, the compression of the dehydration group, and the start and stop of the conveying device.

The water supply device is a water pump and a pipeline, and the water pump transports the sewage from the sewage pool to the dehydration device, and a pressure gauge is provided at the position where it enters the dehydration device.

The dehydration device is a box-type filter press, including a main beam, a thrust plate, and a pressing plate; one end of the main beam is connected to the thrust plate, the other side is provided with a filter plate, and the lower side is also provided with a bracket; The filter plate is arranged on the main beam, and there is a pressing plate on both sides of the filter plate, and the moving device of the filter plate is fixed with the pressing plate through a connecting rod.

There is a feed hole in the middle of the thrust plate, and the outlet water is open flow and undercurrent; the open flow is that the filtrate flows out through the first filtrate hole and the second filtrate hole on the lower side of the filter plate on the side of the filter medium, and the valve controls its opening. closed; the dark flow is that the filtrate flows out through a group of third filtrate holes on the front of the filter plate through the filter medium; when pressing, the pressing plate is pressed on the filter plate through the oil cylinder; when working, the oil cylinder is pressing and maintaining a certain pressure; unloading At the same time, the filter plate moving device on both sides of the main beam track is driven by a hydraulic motor, and its opening and closing action and sequence are controlled by PLC.

The filter plate is a high-molecular polyvinyl chloride filter plate, and the filtration pressure for the sludge is 0.3-0.8Mpa, which has certain elasticity and good compression resistance.

The hydraulic system includes a hydraulic cylinder and a solenoid valve; when pressing, the solenoid valve 1DF is turned on, and the hydraulic cylinder pushes the piston rod out. When the pressure gauge DY reaches the set pressure electric shock value, 1DF is powered off and resets, and the hydraulic control check valve Reversely lock the piston rod;

When it is released, the relay 2DF acts to reset the oil cylinder connected to the oil circuit of the hydraulic cylinder; when unloading, the relay 3DF acts to make the filter plate moving device move to the position of the filter plate. After the pressure of the oil circuit rises, the system receives a signal to drive the relay 4DF to guide On, the relay 3DF is powered off, wait for the filter plate moving device to return to a certain position, meet the travel switch, enter the next action, and stop until all the filter plates are unloaded.

The filter medium is polyester filter cloth, and the filter mesh is between 300-400.

The conveying device is a conveyor belt, including electric rollers, drive rollers, reversing rollers, roller sets and belts, and the conveyor belt is driven by an internal drive.

The mud storage box includes a box body and an underframe, the box body is installed on the underframe, one side of the box body is provided with a transport catch, the side of the box body where the transport catch is provided, and the underframe is provided with a hinge.

The beneficial effect of this utility model:

The improved sludge dewatering system of the utility model adopts a box-type filter press as the dewatering equipment, selects polyester material as the filter cloth, and the filter mesh is between 300-400, and adopts a pneumatic diaphragm pump as the water supply device, and It adopts PLC control, which has the advantages of simple operation, reasonable cost and small footprint.

Description of drawings

Figure 1 is a block diagram of the sludge dewatering system;

Fig. 2 is a structural diagram of a dehydration device;

Fig. 3 is a hydraulic system connection diagram;

Fig. 4 is a structural diagram of a mud storage box;

Among them, 1. Sewage tank; 2. Water pump; 3. Pressure gauge; 4. Main beam; 5. Thrust plate; 6. Filter plate moving device; 7. Compression plate; 8. Filter plate; 9. First filtrate Hole; 10, the second filtrate hole; 11, the third filtrate hole; 12, the box; 13, the bottom frame; 14, the claw buckle; 15, the hinged shaft.

detailed description

A kind of improved sludge dewatering system of the present utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, an improved sludge dewatering system includes a water supply device, a dewatering device, a conveying device, a mud storage tank, a hydraulic system, and a control system. The water supply device is an air compressor that drives a pneumatic diaphragm, and the dehydration device Installed on a support, one end of the support is welded with a funnel, the conveying device is placed under the funnel, the mud storage box is placed at one end of the conveying device, and an observation platform is provided on one side of the support; the hydraulic cylinder in the hydraulic system drives The dehydration device is equipped with an electromagnetic relay valve to set the pressure of the oil circuit; the control system adopts PLC control to realize the start and stop of the pump, the compression of the dehydration group, and the start and stop of the conveying device.

As shown in Figure 2, the water supply device is a water pump 2 and pipelines, the water pump 2 transports sewage from the sewage tank 1 to the dehydration device, and a pressure gauge 3 is provided at the position entering the dehydration device.

The dehydration device is a box-type filter press, including a main beam 4, a thrust plate 5, and a pressing plate 7; one end of the main beam 4 is connected to the thrust plate 5, and a filter plate 8 is provided on the other side, and the lower side A bracket is also provided; the filter plate 8 is arranged on the main beam 4, and there is a pressing plate 7 on both sides of the filter plate 8, and the filter plate moving device 6 and a pressing plate 7 are fixed by connecting rods.

In the middle of the thrust plate 5, there is a feeding hole, and the water outlet is open flow and undercurrent; the open flow is that the filtrate flows out through the first filtrate hole 9 and the second filtrate hole 10 on the lower side of the filter plate 8 through the filter medium, The valve controls its opening and closing; the undercurrent is that the filtrate flows out through a group of third filtrate holes 1 on the front of the filter plate 8 through the filter medium; when pressing, the pressing plate 7 is pressed on the filter plate 8 through the oil cylinder; Tighten and maintain a certain pressure; when unloading, the filter plate 8 moving device on both sides of the main beam 4 track is driven by a hydraulic motor, and its opening and closing action and sequence are controlled by PLC.

The filter plate 8 is a high-molecular polyvinyl chloride filter plate, and the filtration pressure for sludge is 0.3-0.8Mpa, which has certain elasticity and good compression resistance.

The hydraulic system includes a hydraulic cylinder and a solenoid valve; when pressing, the solenoid valve 1DF is turned on, and the hydraulic cylinder pushes the piston rod out. When the pressure gauge DY reaches the set pressure electric shock value, 1DF is powered off and resets, and the hydraulic control check valve Lock the piston rod in the opposite direction; when it is released, the relay 2DF acts to reset the oil cylinder connected to the oil circuit of the hydraulic cylinder; when unloading, the relay 3DF acts to make the filter plate moving device move to the position of the filter plate. The system receives the signal to drive the relay 4DF to turn on, and the relay 3DF to turn off the power, wait for the filter plate moving device to return to a certain position, and when it meets the travel switch, it enters the next action until the filter plate is completely unloaded and then stops.

The filter medium is polyester filter cloth, and the filter mesh is between 300-400.

The conveying device is a conveyor belt, including electric rollers, drive rollers, reversing rollers, roller sets and belts, and the conveyor belt is driven by an internal drive.

Described mud storage box comprises box body 12 and underframe 13, and described box body 12 is installed on the underframe 13, and box body 12 one side is provided with transport and grabs buckle 14, and the box body 12 side that transports and grabs buckle 14 is set, The base frame 13 is provided with a hinge shaft 15 .

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also change and modify the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (9)

1. An improved sludge dewatering system, comprising a water supply device, a dewatering device, a conveying device, a mud storage tank, a hydraulic system and a control system, wherein the water supply device is an air compressor driving a pneumatic diaphragm, and the dewatering device Installed on a support, one end of the support is welded with a funnel, the conveying device is placed under the funnel, the mud storage box is placed at one end of the conveying device, and an observation platform is provided on one side of the support; the hydraulic cylinder in the hydraulic system drives The dehydration device is equipped with an electromagnetic relay valve to set the pressure of the oil circuit; the control system adopts PLC control to realize the start and stop of the pump, the compression of the dehydration group, and the start and stop of the conveying device. 2. A kind of improved sludge dewatering system according to claim 1, it is characterized in that, described water supply device is water pump and pipeline, and water pump transports sewage to dewatering device from sewage tank, and the position that enters dewatering device is provided with There are pressure gauges. 3. A kind of improved sludge dewatering system according to claim 1, it is characterized in that, described dewatering device is box-type filter press, comprises main girder, thrust plate, hold-down plate; Described main girder one end and The thrust plate is connected, the other side is provided with a filter plate, and the lower side is also provided with a bracket; the filter plate is arranged on the main beam, and there is a compression plate on both sides of the filter plate, and the filter plate moving device is connected with a compression plate. The plates are secured by connecting rods. 4. A kind of improved sludge dewatering system according to claim 3, it is characterized in that, in the middle of the said thrust plate, there is a feeding hole, and the outlet water is open flow and undercurrent; The first filtrate hole and the second filtrate hole on the lower side of the plate flow out, and the valve controls its opening and closing; the undercurrent is that the filtrate flows out through a group of third filtrate holes on the front of the filter plate through the filter medium; The tight plate presses on the filter plate; when working, the oil cylinder presses and maintains a certain pressure; when unloading, the filter plate moving device on both sides of the main beam track is driven by a hydraulic motor, and its opening and closing action and sequence are controlled by PLC. 5. An improved sludge dewatering system according to claim 3 or 4, characterized in that the filter plate is a polymer polyvinyl chloride filter plate, and the filter press pressure for the sludge is 0.3-0.8Mpa. 6. An improved sludge dewatering system according to claim 1, characterized in that the hydraulic system includes a hydraulic cylinder and a solenoid valve; when pressing, the solenoid valve 1DF is turned on, and the hydraulic cylinder pushes the piston rod out. When the pressure gauge DY reaches the set pressure and electric shock value, 1DF will be reset after power off, and the hydraulic control check valve will lock the piston rod in reverse; The relay 3DF moves to make the filter plate moving device move to the filter plate position. After the pressure of the oil circuit rises, the system receives a signal to drive the relay 4DF to conduct, and the relay 3DF is powered off. Waiting for the filter plate moving device to return to a certain position, when it meets the travel switch, Go to the next action and stop until all the filter plates are removed. 7. An improved sludge dewatering system according to claim 4, characterized in that the filter medium is polyester filter cloth with a filter mesh of 300-400. 8. A kind of improved sludge dewatering system according to claim 1, it is characterized in that, described conveying device is conveyer belt, comprises electric roller, drive roller, reversing roller, supporting roller group and belt, the drive of conveyer belt Driven internally. 9. An improved sludge dewatering system according to claim 1, characterized in that, the mud storage box includes a box body and an underframe, the box body is installed on the underframe, and one side of the box body is provided with a transport Grab buckle, the side of the box body where the grab buckle is transported is set, and the bottom frame is provided with a hinge.