Novel rapid sludge dewatering system

Abstract

The invention discloses a novel rapid sludge dewatering system which comprises a stacked screw press, a metering dosing pump and a belt filter press, the feeding end of the stacked screw press is communicated with a sludge storage tank through a pipeline, and the discharging end of the stacked screw press is communicated with a double-spiral mixer through a pipeline; a feeding end pipeline of the double-helix mixer is further connected with the metering dosing pump, a discharging end of the double-helix mixer is communicated with the material distributing device through a screw pump, the material distributing device comprises a mud distributing box, a plurality of mud distributing nozzles are vertically and evenly arranged at the bottom of the mud distributing box at intervals, manual ball valves are installed on the mud distributing nozzles respectively, and the manual ball valves are connected with the screw pump. The material distributing device is arranged above a feeding belt of the belt filter press, and a discharging end of the belt filter press is communicated with sludge drying equipment or is directly communicated with a material receiving vehicle. The water content of the sludge can be quickly reduced to 70% through the system, so that the cost is saved and the efficiency is improved for subsequent sludge drying equipment to treat the sludge.

Description

Technical Field

[0001] The invention relates to a novel sludge rapid dehydration system, belonging to the technical field of sludge drying. The system can be used to rapidly dehydrate sludge with a water content of about 97-99% in a thickening tank of a sewage treatment plant, and reduce the sludge water content to 70%. Background Art

[0002] At present, common sludge drying equipment in the domestic market include plate and frame filter presses, physical presses, low-temperature drying equipment, etc. Plate and frame filter presses and physical presses generally have high investment costs and large footprints, while low-temperature drying equipment generally has high energy consumption due to the high moisture content of the sludge. Summary of the invention

[0003] The purpose of the present invention is to provide a novel sludge rapid dehydration system, by which the sludge moisture content can be rapidly dehydrated to 70%, thereby saving costs and improving efficiency for subsequent sludge drying equipment to treat the sludge.

[0004] The object of the present invention is achieved in this way. A new type of sludge rapid dehydration system includes a screw press, a metering and dosing pump, and a belt filter press. The feed end of the screw press is connected to the sludge storage tank through a pipeline, and the discharge end of the screw press is connected to the double-helix mixer through a pipeline. The feed end pipeline of the double-helix mixer is also connected to the metering and dosing pump. The discharge end of the double-helix mixer is connected to a distribution device through a screw pump. The distribution device includes a mud distribution box. A plurality of mud distribution nozzles are vertically evenly spaced at the bottom of the mud distribution box. Manual ball valves are respectively installed on the mud distribution nozzles. The distribution device is installed above the feed belt of the belt filter press. The discharge end of the belt filter press is connected to the sludge drying equipment or directly connected to the receiving vehicle.

[0005] This system utilizes the dehydration effect of the screw stack to achieve a similar effect as enhancing sludge concentration. A certain amount of FeCl3 is added to the concentrated sludge, and the stirring function of the double-helix mixer is used to achieve the sludge wall-breaking effect of FeCl3. The wall-broken sludge is transported to the belt filter press to achieve secondary dehydration of the sludge. After secondary dehydration, the sludge moisture content can be reduced to 70% (tested). At this time, the sludge that has been wall-broken and dehydrated can be treated with low-temperature drying, hollow paddle drying and other equipment, which can greatly improve the production efficiency of the original equipment.

[0006] Compared with the prior art, the advantages of the present invention are: 1. The single equipment of the system is mature and the system operation is highly stable. 2. The equipment investment is small. The system equipment is common equipment for sewage treatment. The system operation can be realized by modifying the original equipment, which can improve the equipment utilization rate. 3. The equipment has high continuity. 4. The equipment is easy to repair and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a process flow chart of the present invention. Implementation

[0008] The present invention is further described in detail below with reference to the accompanying drawings.

[0009] A new type of sludge rapid dewatering system, such as Figure 1 As shown, it includes a screw press 2, a metering and dosing pump 3, and a belt filter press 7. The feed end of the screw press 2 is connected to the mud storage tank 1 through a pipeline, and the discharge end of the screw press 2 is connected to the double-helix mixer 4 through a pipeline. The feed end pipeline of the double-helix mixer 4 is also connected to the metering and dosing pump 3. The discharge end of the double-helix mixer 4 is connected to a distribution device 6 through a screw pump 5. The distribution device 6 includes a mud distribution box 10. A plurality of mud distribution nozzles 12 are vertically evenly spaced at the bottom of the mud distribution box 10. Manual ball valves 11 are respectively installed on the mud distribution nozzles 12. The distribution device 6 is installed above the feed belt of the belt filter press 7. The discharge end of the belt filter press 7 is connected to the sludge drying equipment 8 or directly connected to the material receiving vehicle 9.

[0010] In the above-mentioned Figure 1 middle: Dehydration process: After adding an appropriate amount of PAM agent to the sludge in the sludge storage tank 1, it is transported to the screw press 2 to complete the primary dehydration process of the sludge, reducing the water content of the sludge to 85-90%. In order to further reduce the water content of the sludge, it is necessary to break the cell wall of the difficult-to-remove intracellular water inside the sludge, and then the water content of the sludge can be further reduced. The ordinary belt filter press can only reduce the water content of the sludge to about 80%. After adding an appropriate amount of FeCl3 to the sludge through the metering dosing pump 3, the sludge is sent to the double-helix mixer 4 for stirring, so that FeCl3 and the sludge are fully mixed to achieve the best wall-breaking effect. The screw pump 5 transports the broken sludge to the distribution device 6 through the pipeline. The distribution device 6 uses the pipeline pressure to evenly arrange the broken sludge on the filter cloth of the belt filter press 7, and then the belt filter press 7 is used to complete the secondary dehydration process of the sludge. At this time, the water content of the sludge will be reduced to about 70%, which has been experimentally verified.

[0011] Material distribution device: the material distribution device 6 includes a mud distribution box 10, and a plurality of mud distribution nozzles 12 are evenly spaced vertically at the bottom of the mud distribution box 10, and manual ball valves 11 are respectively installed on the mud distribution nozzles 12. The sludge in the material distribution box 10 is squeezed out from the mud distribution nozzles 12 by using the pipeline pressure of the screw pump 5 to transport the sludge to achieve the purpose of material arrangement. Secondly, when the internal pressure of the material distribution box 10 is uneven and causes uneven mud discharge, the mud discharge amount of the branch can be controlled by adjusting the manual ball valve 11 installed on the mud distribution nozzle, so that the mud discharge amount is kept constant to achieve the purpose of uniform material distribution, providing favorable conditions for the secondary dehydration of the belt filter press.

[0012] Subsequent treatment of sludge: In order to meet environmental protection requirements or sludge reuse requirements, the sludge needs to be dehydrated again or the moisture content is reduced, which can be done in the following ways: Equipment drying: Sludge with a moisture content of 70% can be dehydrated three times by entering the sludge drying equipment 8 again. The sludge drying equipment 8 can use low-temperature drying, hollow paddle drying and other equipment. The sludge with a moisture content of 70% has been completely solidified. At this time, the material can effectively improve the working environment of the drying equipment, improve the utilization rate of the drying equipment, reduce the energy consumption of the drying equipment, and effectively assist the sludge drying equipment to dry the sludge. Incremental drying: Sludge with a moisture content of 70% can be reduced to 60% by an incremental method after mixing with other solid waste. At this time, only 10% of the solid waste needs to be added to make the sludge moisture content reach 60%, thereby meeting environmental protection requirements. This method is suitable for places where materials are sufficient and convenient. The stirred materials can be directly loaded onto a truck 9 for harmless landfill treatment, and can also be used in industries such as sludge composting.

Claims

1. A novel sludge rapid dehydration system, comprising a screw press, a metering dosing pump, and a belt filter press, characterized in that: The feed end of the screw press is connected to the mud storage tank through a pipeline, the discharge end of the screw press is connected to the double-helix mixer through a pipeline, the feed end pipeline of the double-helix mixer is also connected to the metering dosing pump, the discharge end of the double-helix mixer is connected to the distribution device through a screw pump, the distribution device includes a mud distribution box, a plurality of mud distribution nozzles are vertically evenly spaced at the bottom of the mud distribution box, manual ball valves are respectively installed on the mud distribution nozzles, the distribution device is installed above the feed belt of the belt filter press, and the discharge end of the belt filter press is connected to the sludge drying equipment or directly connected to the receiving vehicle.

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