Sludge treatment system

Abstract

The utility model discloses a sludge treatment system, which belongs to the field of sludge treatment and utilizes biogas generated in an anaerobic digestion process through a biogas purification system so as to assist in supplying gas to a gas combustion chamber, so that the resource reutilization rate is improved, and the cost is reduced. The system mainly comprises a concentration device, the concentration device is connected with a mixing stirrer through a concentration pump, the mixing stirrer is connected with a dehydration device through a mixing pump, the dehydration device is connected with an anaerobic digester through a screw conveyer, the anaerobic digester carries out constant temperature control through a temperature control system, and the anaerobic digester is connected with a biogas purification system and a drying system. The biogas purification system is connected with a gas storage tank II, the gas storage tank II is connected with a biogas compressor, the biogas compressor is connected with a drying system, and the drying system is connected with a waste heat boiler. The sludge treatment device is mainly used for sludge treatment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sludge treatment, and concretely, especially relates to a sludge treatment system. BACKGROUND

[0002] Sludge is mainly composed of solid substances in original wastewater and solid substances generated in the wastewater treatment process. It contains a large amount of organic matter, inorganic matter, pathogenic microorganisms and various chemical substances. If the sludge is not properly treated and directly discharged or stacked, it will cause great harm: harmful substances in the sludge can destroy the soil structure, affect soil fertility, and even pose a threat to human health through the food chain; pathogenic microorganisms and parasite eggs in the sludge can cause various diseases and pose a threat to human health. Traditional sludge treatment mostly uses sedimentation, dewatering, stabilization (anaerobic digestion) and drying methods to treat sludge. For example, the sludge treatment system with publication number CN219239491U is treated by hydrothermal and drying methods. This method consumes a lot of energy and cannot utilize biogas in the anaerobic digestion process, resulting in waste of resources. SUMMARY

[0003] The utility model aims at providing a sludge treatment system, which utilizes biogas generated in the anaerobic digestion process through a biogas purification system to assist the supply of a gas combustion chamber, thereby improving resource recycling rate and reducing cost.

[0004] The utility model is implemented by the following technical solutions:

[0005] A sludge treatment system comprises a concentration device, the concentration device is connected with a mixing stirrer through a concentration pump, the mixing stirrer is connected with a dewatering device through a mixing pump, the dewatering device is connected with an anaerobic digestion tank through a screw conveyor, the anaerobic digestion tank is controlled at a constant temperature through a temperature control system, the anaerobic digestion tank is connected with a biogas purification system and a drying system respectively, the biogas purification system is connected with a gas storage tank II, the gas storage tank II is connected with a biogas compressor, the biogas compressor is connected with the drying system, and the drying system is connected with a waste heat boiler.

[0006] Further, the concentration device is a belt filter, which can accelerate the sludge treatment speed compared with traditional gravity sedimentation.

[0007] Further, the dewatering device is a centrifugal dewatering machine.

[0008] Further, the drying system comprises a rotary furnace and a gas combustion chamber, the anaerobic digestion tank is connected with the rotary furnace through the screw conveyor, the rotary furnace is connected with the gas combustion chamber and the waste heat boiler respectively, a heat recovery pipe is arranged above the gas combustion chamber, the heat recovery pipe is connected with the rotary furnace, and the sustainable recycling rate of heat in the gas combustion chamber is improved.

[0009] Further, the biogas compressor is connected with the gas combustion chamber through a valve, which can adjust the speed of supplying the biogas to the gas combustion chamber.

[0010] Further, the temperature control system comprises a coiled heating pipe arranged at the bottom of the anaerobic digestion tank and a temperature sensor arranged in the anaerobic digestion tank to maintain the optimum temperature and promote the microbial activity.

[0011] Further, the biogas purification system comprises a gas storage tank I connected with the anaerobic digestion tank and a gas filter, the gas filter is connected with a drying tower, the drying tower is connected with a desulfurization tower, the desulfurization tower is connected with an absorption tower, and the absorption tower is connected with a gas storage tank II.

[0012] Compared with the prior art, the biogas purification system has the advantages that:

[0013] 1. The belt filter is used for preliminary concentration, and the sludge treatment speed is faster than that of the traditional gravity sedimentation.

[0014] 2. The temperature control system is used for temperature control of the anaerobic digestion tank to keep the temperature in the anaerobic digestion tank constant.

[0015] 3. The biogas purification system is used for utilizing the biogas generated in the anaerobic digestion process to assist the gas combustion chamber, so that the resource reuse rate is improved, and the cost is reduced.

[0016] 4. The excess heat energy waste gas can be converted into the waste heat boiler for utilization, and the resource reuse rate is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structural principle diagram of the utility model;

[0018] Figure 2 is the structural schematic diagram of the biogas purification system of the utility model. DETAILED DESCRIPTION

[0019] The utility model will be further described in combination with the drawings.

[0020] Example 1

[0021] As Figure 1As shown, a sludge treatment system includes a thickening device, which is connected to a mixing agitator via a thickening pump. The mixing agitator is connected to a dewatering device via a mixing pump. The dewatering device is connected to an anaerobic digester via a screw conveyor. The anaerobic digester is temperature-controlled by a temperature control system. The anaerobic digester is connected to a biogas purification system and a drying system. The biogas purification system is connected to a gas storage tank II, which is connected to a biogas compressor. The biogas compressor is connected to the drying system, which is connected to a waste heat boiler.

[0022] Example 2

[0023] like Figure 1 – Figure 2 As shown, a sludge treatment system includes a belt filter press as the thickening equipment, which accelerates sludge treatment compared to traditional gravity settling; a centrifugal dewatering machine as the dewatering equipment; and a drying system comprising a rotary kiln and a gas combustion chamber. An anaerobic digester is connected to the rotary kiln via a screw conveyor, and the rotary kiln is connected to both the gas combustion chamber and a waste heat boiler. A heat recovery pipe is installed above the gas combustion chamber and connected to the rotary kiln, improving the sustainable recycling rate of heat within the gas combustion chamber. A biogas compressor is connected to the gas combustion chamber via a valve, which can adjust the flow of gas into the combustion chamber. The biogas supply rate; the temperature control system includes a U-shaped heating pipe and a temperature sensor. The U-shaped heating pipe is located at the bottom of the anaerobic digester and is responsible for heating the anaerobic digester. An insulation layer is provided on the outside of the anaerobic digester. The temperature sensor is located inside the anaerobic digester to maintain the optimal temperature and promote microbial activity; the biogas purification system includes a gas storage tank I, which is connected to the anaerobic digester and a gas filter. The gas filter is connected to a drying tower, which is connected to a desulfurization tower, which is connected to an absorption tower, and the absorption tower is connected to a gas storage tank II. The rest is the same as in Example 1.

[0024] The belt filter rapidly concentrates and dehydrates the sludge, and then the sludge is transported to a mixing stirrer, in which a polymer flocculant is added to condition the sludge to improve the dewatering performance of the sludge, and then the sludge is dewatered by a centrifugal dewatering machine. The dewatered sludge is transported into an anaerobic digestion tank to decompose organic matters by microorganisms. The anaerobic digestion tank controls the temperature by a temperature sensor and a coiled heating tube, and the temperature is usually controlled at about 35°C. The sludge in the anaerobic digestion tank is transported to a rotary furnace to be heated by a gas combustion chamber (the drying principle is the same as the prior art), and the excess heat energy waste gas is converted to a waste heat boiler (the prior art). The biogas generated in the anaerobic digestion tank is pumped into a gas storage tank I by a biogas pump to be initially pressurized; then filtered by a gas filter to remove solid particulate matters; then dehumidified by a drying tower, which can remove water vapor to prevent corrosion of downstream equipment; then removed of hydrogen sulfide by a desulfurization tower; and finally absorbed of CO2 and other acid gases by an absorption tower. The purified biogas is stored in a gas storage tank II, and is supplied to the gas combustion chamber by a biogas compressor and a valve for auxiliary use, so as to improve the resource reuse rate and reduce the cost.

Claims

1. A sludge treatment system, comprising a thickening device, characterized in that: The concentration equipment is connected to a mixing agitator via a concentration pump. The mixing agitator is connected to a dehydration equipment via a mixing pump. The dehydration equipment is connected to an anaerobic digester via a screw conveyor. The anaerobic digester is kept at a constant temperature via a temperature control system. The anaerobic digester is connected to a biogas purification system and a drying system. The biogas purification system is connected to a gas storage tank II. The gas storage tank II is connected to a biogas compressor. The biogas compressor is connected to the drying system. The drying system is connected to a waste heat boiler.

2. The sludge treatment system according to claim 1, characterized in that: The concentration equipment mentioned is a belt filter press.

3. The sludge treatment system according to claim 1, characterized in that: The dehydration equipment mentioned is a centrifugal dehydrator.

4. The sludge treatment system according to claim 1, characterized in that: The drying system includes a rotary kiln and a gas combustion chamber. The anaerobic digester is connected to the rotary kiln via a screw conveyor. The rotary kiln is connected to the gas combustion chamber and a waste heat boiler. A regenerating pipe is installed above the gas combustion chamber and is connected to the rotary kiln.

5. The sludge treatment system according to claim 4, characterized in that: The biogas compressor is connected to the gas combustion chamber via a valve.

6. The sludge treatment system according to claim 1, characterized in that: The temperature control system includes a U-shaped heating tube and a temperature sensor. The U-shaped heating tube is located at the bottom of the anaerobic digester, the outside of the anaerobic digester is provided with an insulation layer, and the temperature sensor is located inside the anaerobic digester.

7. The sludge treatment system according to claim 1, characterized in that: The biogas purification system includes a gas storage tank I, which is connected to an anaerobic digester and a gas filter. The gas filter is connected to a drying tower, which is connected to a desulfurization tower, which is connected to an absorption tower, and the absorption tower is connected to a gas storage tank II.

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