KR20010037075A - Sludge dry-plant - Google Patents

Abstract

PURPOSE: A sewage sludge drying plant is provided, to prevent air pollution due to dioxin, odor generation by reclamation and underground water pollution caused by heavy metals and harmful microbes and to recycle the sludge particles containing Si02, Al2O3, Fe2O3, and CaO in large quantities as a cement source. CONSTITUTION: The sewage sludge drying plant comprises: i) a drying-crushing part(100) that controls cake-form sludge to 400-650deg.C using a multiple-hearth furnace or a direct rotary kiln and repeats drying and crushing for water content to reach 70-80%; ii) a conveying part(200) that dries the sludge particles at low temperature and conveys them; iii) a drying silo(300) that crushes the sludge particles and dries them by variation in air current; iv) a centrifugal classifier(400) separating dust emitted from the drying-crushing part(100) and the drying silo(300); v) a wet scrubber(500) purifying odor and noxious exhaust gas using sodium hydroxide; vi) a condenser(600) cooling the purified gas to normal temperature; and vii) an exhaust gas measuring part(700) discharging odor and dust contained in the exhaust gas of normal temperature into the air.

Description

Sludge dry-plant

The present invention relates to an environmentally friendly wastewater sludge drying treatment apparatus that can dry and recycle sludge generated in domestic sewage and wastewater treatment plants and supply sludge powder containing a large amount of SiO₂, Al₂O₃, Fe₂O₃, CaO as a cement raw material. will be.

Economic development and improvement of life lead to an increase in domestic sewage and industrial wastewater, and the amount of sludge generated from domestic sewage and factory wastewater treatment also increases, and its treatment method becomes an environmental problem. It is becoming.

Until now, several incineration methods have been developed to incinerate wastes such as sludge disposal methods and stalker incineration methods.However, the above incineration methods require excessive facility investment costs and limited throughput. When the drying efficiency is low when the incineration temperature is lowered, there is a fear that the volatilization and dioxins of heavy metals harmful to the human body may occur.

In addition, the landfill of sludge is caused by the sludge which contains a lot of moisture, causing mass complaints by local residents around the landfill, and the leachate generated by landfill contains a large amount of heavy metals and harmful microorganisms, contaminating groundwater. It is a major cause of secondary pollution, and the sludge, etc., has a high water content, which causes the ground of the landfill to be weakened.

In addition, the pyrolysis method of the sludge is a method of obtaining a low molecular oil by pyrolyzing the polymer organic matter contained in the sludge and is still in the research stage, and individuality is required for economic efficiency that requires additional heat required for pyrolysis.

Recently, many researches have been conducted on the recycling method of providing sludge containing SiO₂, Al₂O₃, Fe₂O₃, and CaO as cement raw materials, but the specific system has not been visualized.

To summarize the cement manufacturing method, the condensation of a suitable amount in the clinker, a semi-finished product of cement made by mixing, pulverizing and mixing raw materials containing four components of SiO₂, Al₂O₃, Fe₂O₃ and CaO, before melting them It is known to grind by adding gypsum which is a retardant.

The present invention has been made to solve the above problems, in particular, by introducing a low-efficiency dryer method to the sludge drying treatment to induce complete drying, by transporting the sludge powder in a complete dry powder state to the cement plant to provide as a cement raw material, recycling It is to provide environmentally friendly sludge dry-plant because no waste is produced by producing cement.

Another object of the present invention is to provide an environmentally friendly waste water sludge drying apparatus by transporting to a cement factory in a completely dry powder state to minimize the generation of harmful gases during cement firing and to produce recycled cement material that is decomposed by the complete combustion in the kiln. will be.

The present invention is a multiple-hearth furnace for controlling the direct heat to about 400 ~ 600 ℃ to achieve the above object or a direct rotary kiln (direct rotary kiln) to control the direct heat to about 450 ~ 650 ℃. Dry air pulverization, which is dried and pulverized with a water content of 70-80%, a transport unit for transporting the sludge particles through the dry crushing unit at low temperature to the storage, and the sludge particles passing through the transport unit. The centrifugal classifier which separates the dust gas discharged between the dry grinding unit and the dry storage, which is secondary grinding by the speed difference of 15% to 25%, and the centrifugal classifier A wet washing unit that neutralizes and discharges the exhaust gas and fines with caustic soda, a heat exchanger that cools the exhaust gas purified by the wet washing unit, and a odor with Characterized in that it consists of an exhaust gas measuring unit, to re-enact the harmful gas to the atmosphere.

1 is an exemplary view of a drying treatment apparatus for wastewater sludge implementing the present invention.

Figure 2 is another illustration of a drying treatment apparatus for wastewater sludge implementing the present invention

* Description of symbols on the main parts of the drawings *

100; Dry grinding unit 110; Multistage Dryer

120; Sludge supply unit 130; Burner

200; Transfer unit 210; cooler

220; Screw conveyor 230; Basket Conveyor

300; 310 between drying; outlet

320; Dust collector 400; Fortune Classer

500; Wet tax government 510; Exhaust gas purification tower

520; Caustic soda tank 530; Circulation pump

540; Activated carbon 600; Heat exchanger

700; Exhaust gas measuring unit 110a; direct heating kiln dryer

It will be described below in detail by a gluing drawing showing an embodiment of the wastewater sludge drying apparatus of the present invention.

1 is an overall view showing an embodiment of the present invention, drying and pulverizing the sludge by controlling the heating temperature of the cake-like sludge supplied by the sludge supply unit for dewatering and refining the sludge of the waste water to about 400 ~ 600 ℃ Drying grinding unit 100 for treating sludge with sludge particles having a water content of 15-20% by repeating the operation, and a transfer unit for drying the sludge particles by drying from the dry grinding unit 100 and transporting the sludge particles to storage between them ( 200 and the drying cycle 300 in which the sludge particles supplied by the transfer unit 200 are pulverized and dried by an airflow difference, and the dust discharged from the dry grinding unit 100 and the drying passage 300. A centrifugal classifier 400 for separating gas, a wet cleaner 500 for purifying odor and harmful exhaust gas exhausted from the centrifugal classifier 400 with caustic soda, and the wet cleaner 500 described above. Dust removal from A heat exchanger 600 that cools the exhaust gas purified by neutralizing the odor to room temperature, and an exhaust gas that completely removes the odor and dust contained in the exhaust gas at room temperature in the heat exchange unit 600 and discharges it to the atmosphere. The gas measuring part 700 is comprised.

As described above, the dry grinding unit 100 constituting the present invention is a cake-type sludge generated from a multiple-hearth furnace 110 and living sewage and industrial wastewater controlled at a drying temperature of about 400 to 600 ° C. Low-temperature heat burner 130 is installed to detect the temperature of the exhaust gas flowing out of the sludge feeder 120 and the multi-stage dryer to control the inflow of the outside air and the amount of combustion fuel so that the inside of the multi-stage dryer is maintained at a constant temperature. The multi-stage dryer 110 sweeps the introduced sludge on the cake in a radial direction from the inside to the outside or in the opposite direction to dry and grind the sludge on the cake in a granular state to drop down stepwise (hearths), arms ( arms, rabbit teeth, and so on.

In addition, the conveying unit 200 has a screw conveyor 220 and a bucket conveyor having a cooler 210 for cooling the powdered sludge particles dried and pulverized in the dry grinding unit 100.

Consisting of the 230, the cooled sludge particles are transferred to the drying path 300 to be stored.

In addition, in the drying passage 300, the sludge particles supplied by the conveying unit 200 are provided with a pulverization and drying function by an airflow car, and the exhaust gas exhausted from the sludge discharge port 310 drying passage 300 is disposed at the lower portion. The dust collector 310 which removes the dust contained in the main | line is provided, and dust is removed and exhausted in the exhaust gas exhausted between the drying paths.

In addition, in the present invention, the centrifugal classifier 400 between the multi-stage dryer 110 and the drying.

It is connected to the configuration 300 to collect the sludge dust by the centrifugal method of dust and exhaust gas exhausted from the multi-stage dryer 110 and the drying path 300, and exhaust only the exhaust gas and discharge the collected sludge fine powder The outlet 410 is configured to be lower.

In addition, the wet cleaner 500 connected to the centrifugal classifier 400 includes an exhaust gas purification tower 510 for purifying exhaust gas, a caustic soda water tank 520 in which caustic soda water is stored, and the caustic soda water tank ( 520, a circulating pump for injecting caustic soda water and an activated carbon layer for circulating caustic soda water sprayed from the exhaust gas purification tower 510 to the caustic soda water tank 520 and to remove odors of the exhaust gas. 540 is provided.

The operation of the wastewater sludge drying apparatus according to the embodiment of the present invention configured as described above will be described.

First, the multi-stage dryer of the dry crushing unit 100 by the sludge supply unit 120 in the state of the sewage sludge (sludge) generated in the domestic sewage and waste water treatment for the deburred wastewater is 70-85%

When entering the 110, the multi-stage by low-temperature burner 130 to sense the temperature of the exhaust gas flowing out of the multi-stage dryer to control the inflow of the outside air and the amount of combustion fuel so that the inside of the multi-stage dryer to maintain a constant temperature The drying temperature of the tank is automatically controlled to 400 ~ 600 ℃, and at the same time, the Cay sludge is swept radially from inside to outside or in the opposite direction by the operation of hearths, arms and teeth. The sludge teeth on the cake are dried and pulverized into a granular state and fall to the bottom step by step.

At this time, in the present invention by controlling the drying temperature of the multi-stage dryer 110 to about 400 ~ 600 ℃, SiO₂, Al₂O₃, Fe₂O₃ and CaO constituting the sludge, the organic compound of the sludge is decomposed and dioxins (Dioxin), etc. At the same time, it destroys weak substances and prevents their regeneration.

In addition, various harmful gases such as sulfur oxides (SOx), nitrogen oxides (NOx), and hydrogen chloride (HCL) generated from the sludge dried in the multistage dryer 110 are centrifugal classifiers 400 through exhaust pipes of the multistage dryer. Is exhausted.

In addition, the sludge particles dried at a water content of 20 to 30% by the multi-stage dryer 110 are transferred to the bucket conveyor 230 while being cooled by the screw conveyor 220 in which the cooler 210 of the transfer unit 200 is installed. And again stored in the drying path 300 by the bucket conveyor 230,

At this time, in the drying cycle 300, 15 to 25% of the total amount of drying is dried, and the sludge particles and hot air streams are moved as co-currents, and the secondary grinding is performed by the speed difference between the sludge particles and the hot air. When the exhaust gas containing the odor generated therein and dust are moved to the next centrifugal classifier 400, the dust is removed and the exhaust gas is exhausted via the dust collector 320 installed between the drying paths.

Thus, sludge particles of about 15% of moisture content stored in the drying path 300 are obtained, and these sludge particles are mainly composed of SiO₂, Al₂O₃, Fe₂O₃ and CaO, and the wastewater sludge, which is rich in the main component of cement raw material, is used as cement raw material. As it can be recycled, it increases the economic value and prevents the volatilization and dioxin generation of heavy metals harmful to the human body, which has emerged in previous incineration methods, the odors caused by the landfilling method of sludge, harmful heavy metals and groundwater pollution, and the ground of landfills. We will solve all environmental problems such as weakening.

In addition, as described above, the dust and the exhaust gas exhausted through the exhaust port of the multistage dryer 110 and the dust collector 320 of the drying path 300 are separated into the dust and the gas in the centrifugal classifier 400, where the residual oil Sludge dust is collected and supplied as recycled cement raw materials, and exhaust gases containing various odorous gases such as odors, sulfur oxides (SOx), nitrogen oxides (NOx) and hydrogen chloride (HCL) are blown by a blower (500). Exhaust gas purification tower

The exhaust gas supplied to the exhaust gas purification tower 510 is an exhaust gas purification tower 510, a caustic soda water tank 520 in which caustic soda water is stored, and the caustic soda water tank.

Sulfur oxide (SOx), nitrogen by a circulation configuration for circulating the caustic soda water sprayed from the exhaust gas purification tower 510 to the caustic soda water tank 520 from the circulation pump 530 for injecting caustic soda water from 520 Various harmful gases such as oxides (NOx) and hydrogen chloride (HCL) are neutralized and the odor is completely purified and exhausted via the activated carbon layer 540.

The exhaust gas purified by the dust removal process by the centrifugal classifier 400 and the odor and harmful gas by the wet cleaning unit 500 is cooled to room temperature in the heat exchange unit 600, and the exhaust gas is measured again. After refining the activated carbon and other filter treatment of the part 700 is to discharge clean gas harmless to the human body through the communication.

2 is a general view showing another embodiment of the present invention, drying and pulverizing the sludge by controlling the heating temperature of the cake-like sludge supplied by the sludge supply unit for dewatering and refining the sludge of the waste water to about 400 ~ 600 ℃ A dry grinding part 100 for repeatedly treating the sludge with sludge particles having a water content of 15-20%, and the dry grinding part

Drying process from (100) and the sludge particles to be transported to the low-temperature drying between the storage unit 200, and between the sludge particles supplied by the conveying unit 200 is dried and crushed and dried by an airflow vehicle (300) ), The centrifugal classifier 400 for separating the dust gas discharged from the dry grinding unit 100 and the drying path 300, and the odor and harmful exhaust gas exhausted from the centrifugal classifier 400 A wet cleaner 500 for purifying with caustic soda, a heat exchanger 600 for neutralizing dust removal and odor from the wet cleaner 500, and cooling the purified exhaust gas to room temperature; It consists of an exhaust gas measuring unit 700 to completely remove the odor and dust contained in the exhaust gas at room temperature in the heat exchange unit 600 of the discharge to the atmosphere, where the sludge on the cake is dried and pulverized repeatedly Sludge Dry milling unit for processing the sludge particles in 15-20% yield

Direct heating kiln (direct rotary kiln) in place of the multi-stage dryer

Dry grinding treatment of the k-phase sludge at 110a.

Such direct heating kilns are already known as spiral flights.

It consists of a lifting flight, a shell, etc. Here, the direct heat is controlled at about 450 ~ 650 ℃, and the drying and grinding process of cake-like sludge is performed horizontally. Easy to change the length, the installation conditions are simple, and the drying temperature is stably maintained, so that the sludge drying temperature and throughput can be easily adjusted.

Also, by controlling the drying temperature of the direct heating kiln (110a) to about 450 to 650 ° C., SiO2, Al₂O₃, Fe₂O₃, and CaO, which constitute sludge, remain and at the same time, organic compounds of sludge are decomposed and dioxins (Dioxin), etc. It destroys weak substances and at the same time prevents regeneration, and sulfur oxides generated from dried sludge.

Various harmful gases such as (SOx), nitrogen oxides (NOx) and hydrogen chloride (HCL) are exhausted to the centrifugal classifier 400 through the exhaust pipe of the multistage dryer.

In addition, the sludge particles dried at a water content of 20 to 30% are stored in the drying path 300 by the transfer part 200, and here, 15 to 25% of the dry amount is dried and stored, and the dust collector

Dust is removed while passing through 320 and only the exhaust gas is exhausted.

Thus, sludge particles having a moisture content of about 15% stored in the drying path 300 are obtained, and these sludge particles have economic value and dioxins recycled from wastewater sludge mainly composed of SiO₂, Al₂O₃, Fe₂O₃ and CaO as cement raw materials. The same is true for solving environmental problems such as prevention of occurrence, odor, harmful heavy metals, groundwater pollution, etc.

In addition, in the centrifugal classifier 400, the exhaust gas containing various odorous gases such as odor, sulfur oxides (SOx), nitrogen oxides (NOx) and hydrogen chloride (HCL) is separated into dust and gas by a blower. Caustic Soda Neutralization Method (SOx, Nitrogen Oxide)

(NOx), hydrogen chloride (HCL) and other harmful gases are neutralized and the odor is completely purified while passing through the activated carbon layer 540, and the purified exhaust gas is cooled to room temperature in the heat exchange unit 600, After refining the activated carbon and other filter treatment process of the exhaust gas measuring unit 700, the exhaust gas is discharged clean gas harmless to the human body.

As described above, the present invention is a multi-stage dryer for controlling direct heat at about 400 to 600 ° C. or a direct heating kiln dryer for controlling direct heat at about 450 to 650 ° C., and a dry grinding part of a pulverizing process, and by a speed difference between hot air flows. Waste cement sludge is recycled by the construction of the drying cycle in charge of secondary crushing, centrifugal classifier separating the emitted dust gas, and a wet washing machine that neutralizes and discharges harmful exhaust gases and fines with caustic soda. Therefore, it is economical, and the sludge treatment is completely solved, and the environmentally friendly effect of solving the pollution factors such as air / water pollution generated in the conventional sludge treatment process is great.

Claims (3)

Dry grinding unit 110, which is a multi-stage dryer that controls direct heat at about 400-600 ° C. or a direct heating kiln dryer that controls direct heat at about 450-650 ° C., and a drying and grinding process of water content of sludge 70-80%. The secondary part is crushed by the speed difference of the hot air stream, and the conveyance part 200 which transfers the sludge particle through the said dry grinding part to low temperature dryness, and transfers it between storage, and the dry amount 15-25 Caustic soda is a drying cycle (300) responsible for the%, a centrifugal classifier (400) for separating the dust gas discharged between the dry grinding section and the dry storage, and the exhaust gas and the fine powder via the centrifugal classifier. A wet washing unit 500 neutralized and discharged, a heat exchange unit 600 cooling the exhaust gas purified by the wet washing unit, and an exhaust gas that redefines odors and harmful gases to the atmosphere by burning coal. 'S dry processing apparatus of the sewage sludge, characterized by consisting of a measuring unit (700). According to claim 1, Dry grinding unit 110 and the drying grinding unit is a drying and grinding process of 70-80% of the water content of the sludge with a multi-stage dryer 110 to control the direct heat to about 400 ~ 600 ℃ degree Transfer part to transfer diesel sludge particles at low temperature to the storage area (200), and the sludge particles passing through the conveying section is secondary grinding by the speed difference of the hot air flow, and the drying cycle (300) responsible for 15 to 25% of the drying amount, and between the dry grinding portion and the dry storage. Centrifugal classifier (400) for separating the dust gas discharged from the water, and the wet washing machine to neutralize and discharge the exhaust gas and the fine powder via the centrifugal classifier with caustic soda 500, a heat exchanger 600 for cooling the exhaust gas purified by the wet cleaning unit, and an exhaust gas measurement unit 700 for refining the odor and harmful gas with ignited coal and exhausting it to the atmosphere. A wastewater treatment sludge drying treatment apparatus. The method of claim 1, wherein the dry grinding unit 110, the drying and grinding process of the water content of 70-80% of the sludge is performed by a direct heating kiln dryer (110a) that controls the direct heat to about 450 ~ 650 ℃ degree, and the drying The transport unit 200 for drying the sludge particles via the crushing unit at low temperature and transferring them between the storage units and the sludge particles passing through the conveying unit are secondary crushed by the speed difference of the hot air flow, and responsible for 15 to 25% of the drying amount. Neutralize the exhaust gas and the fine powder via the centrifugal classifier 400 for separating the dust gas discharged between the drying cycle 300, the dry grinding section and the dry storage, and the caustic soda. A wet cleaner 500 for discharging, a heat exchanger 600 for cooling the exhaust gas purified by the wet cleaner, and an exhaust gas measuring unit for refining the odor and harmful gas to the atmosphere by ignited coal Wastewater sludge drying treatment apparatus, characterized in that consisting of (700).