KR200168722Y1 - Device of paddle and flash type for sludge treatment of foul and waste water - Google Patents

Abstract

The present invention is applied to the sewage and wastewater treatment plant to reduce the various sewage and wastewater sludge discharged from the wastewater, and to facilitate the energyization to fundamentally solve the cause of pollution. The water contained in the sewage and wastewater sludge is dried. By means of incineration, and the resulting dried material is treated by incineration or provided as a source of heat for use as a solid fuel, where sewage and wastewater sludge and primary dry sludge are intermixed. The mixed sludge is introduced into the dryer, but the mixed sludge is micronized and fluidized by a plurality of stirring paddles and choppers mounted therein, and is driven by a power generating means at the bottom of the dryer. There are a plurality of paddles and choppers (dissociation), and the lower surface is supplied with superheated steam and hot air Firstly, the sludge is dried while being micronized, and the first evaporated fine powder is fluidized by the air stream and secondly completely dried through the upper airflow drying duct connected to the space where the paddle is installed. will be.

Description

Agitated paddle airflow dryer for sewage and wastewater sludge treatment {DEVICE OF PADDLE AND FLASH TYPE FOR SLUDGE TREATMENT OF FOUL AND WASTE WATER}

The present invention relates to a drying device for sewage and wastewater sludge using a paddle flash type dryer, and is particularly applied to sewage terminal treatment plants to facilitate the reduction and energyization of various sewage and wastewater sludge discharged from the wastewater, thereby causing pollution. The present invention relates to a drying apparatus for sewage and wastewater sludge, which is to be provided for use as another heat source by drying the sewage and wastewater sludge and incineration of the resulting dry matter or as a solid fuel.

As is well known, our reality of the past has been to improve living standards due to rapid economic development since the 1960s, and to change the level of consciousness of environmental issues. To cope with these changes in the level of awareness, the government is promoting the installation of various basic facilities, and the private sector is rushing to prevent pollution. Among these facilities, the sewage treatment and wastewater treatment facilities discharge sludge as a by-product while treating wastewater by biological and chemical methods.In 1997, the sewage treatment plant discharged 1.5 million tons per year and the equivalent amount from wastewater treatment plants. It is estimated that 10,000 tons of sludge are discharged. These sludges are classified as organic wastes and are highly perishable and are decomposed by microorganisms in the presence of water, causing odor and excessive leachate.

Until now, the sludge has been treated only by landfill, but there is a limit to securing landfill, and due to the problems of secondary pollution such as leachate and odor, the Waste Management Act has specified the treatment by incineration or composting since 2001.

The sludge properties vary depending on the type of sewage pipe, the type of area, the type of raw materials, or the treatment method of each business that discharges them. Therefore, specific and detailed countermeasures such as reduction, recycling, and ease of treatment are taken. There is a great need for it. In general, wastewater sludge treatment methods are classified into recycling by composting and final disposal by energy recovery, reduction, and landfilling by incineration.

Many methods have been developed to facilitate and reduce sludge treatment, but the technology depends on the quality of the sludge. In particular, the sludge dewatering efficiency is not so high that it shows a water content of around 80%. Due to the high water content, the solid content is around 20% and the amount of organic matter contained in the solid is not very high.

For recycling such as composting, aerobic microorganisms must be well propagated. For this purpose, moisture must be adjusted to 60% or less, and even incineration must be removed to the point where the supply of auxiliary calories is minimized.

In other words, incineration or recycling of sludge with a large amount of water causes a lack of heat generation, resulting in a large amount of combustion efficiency, in which it is not decomposed and a large amount of auxiliary fuel is consumed. Therefore, a method of removing water in the sludge should be added before incineration and composting, and a drying operation is the most useful method for removing water.

These drying operations are divided into rotary chelin type, internal stirring type, airflow drying type, and fluidized bed type, and there are differences in the configuration and operation method of each device. The most widely used methods are rotary killin and internal stirring type, and airflow drying type and flow filling type have limited usage so far.

Therefore, the present invention induces reduction of moisture contained in the sewage and wastewater sludge by drying operation, and facilitates recycling and energyization by composting to maximize the efficiency of treatment and recycling and wastewater generated during treatment and The purpose of the present invention is to fundamentally eliminate the occurrence of odor, to block the cause of pollution, and to simultaneously perform the mixing, grinding, evaporation, and drying processes through a single drying process.

In order to achieve the above object, the present invention proposes a stirring paddle airflow type dryer, and mixes the sludge produced in various treatment plants with the pre-dried primary dry sludge and inputs the mixed sludge to the dryer. , The mixed sludge injected is dried by hot air and superheated steam installed in the lower part of the dryer, and the dried sludge to some extent is micronized by a stirring paddle and chopper (pulverizer) driven by the power generating means installed at the bottom of the dryer. Secondary evaporation and drying, fluidized by the air stream of hot air and superheated steam to be completely dried by the secondary drying while passing through the upper airflow drying duct. That is, the conventional stirring dryer is installed at the lower end, and the airflow dryer is located at the upper end, and it is characterized by providing a dryer which is interconnected and combined.

1 is a front view showing the configuration of the present invention

Figure 2 is a side view of Figure 1

※ Explanation of symbols about main part of drawing ※

1-Power generating means 2-Rotation axis 3-Paddle

4-Chopper 5-Airflow Drying Duct 6-Heat Supply Pipe

7-hot air and superheated steam inlet 8-dry sludge classifier 9-wastewater sludge inlet

10-Mixer 11-Dry Sludge Separation Cyclone 12-Mixed Sludge Inlet

13-Dry exhaust gas exhaust 14-Heat exchange condenser 15-Exhaust gas circulation duct

16-stirrer paddle air flow dryer

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing the configuration of the present invention, Figure 2 is a side view of the state diagram of FIG.

In order to use the stirring paddle airflow dryer 16 employed for the preferred embodiment of the present invention, first, the wastewater sludge having a water content of about 70 to 80% is introduced into the inlet (9). And a mixer 10 so as to supply the primary dry sludge, which is dried and conveyed in advance through the dry sludge classifier 8, to be properly mixed at a constant ratio in order to prevent agglomeration in the dryer. The sufficiently mixed sludge is introduced into the dryer 16 of the present invention to be properly dried.

The dryer 16 has a paddle and a chopper in the lower part to dry first the mixed sludge introduced by hot air and superheated steam, and secondly dry the fluidized fine particles in flash dryers or air dryers. Airflow drying takes place for a few seconds, allowing heat to evaporate from the solid within three to four seconds by very fast heat transfer to the micronized solid particles of heat in the gas.

The dryer 16 may be classified into two types when applied to an actual site, and is classified into a case of using only a dryer and a case of using a dryer associated with incineration.

When only the dryer is used, the combustion heat generated from the burner is introduced into the hot air inlet 7 in the form of hot air, and some of the exhaust gas is circulated by the circulation duct 15 to be mixed with the burner combustion heat to form superheated steam. do.

When used in conjunction with incineration, the exhaust gas generated after incineration is used in the form of superheated steam and introduced into the superheated steam inlet (7). In this case, some exhaust gases are circulated and used as well. The exhaust gas is cooled by the Kling Tower to cool some of the water contained in the exhaust gas to remove some of it, and then mixed with combustion air to be introduced into the incinerator to burn again to minimize secondary pollution such as odor.

Among these two applications, we will use an example in conjunction with an incinerator. The inlet 7 through which hot air and superheated steam is supplied is introduced at a temperature of about 400 ° C., but the contact time is very short, so that the temperature of the sludge in the reactor, that is, the solids, does not rise above 100 ° C. during drying. In other words, it must be indirectly dried on other solids (food residues, etc.) in addition to sewage sludge, so that it can be applied to substances sensitive to decomposition.

The superheated steam required for drying is introduced while the exhaust gas generated from the dryer 16 is recycled to the incinerator and heated, and as described above, the mixed sludge of the sewage and wastewater sludge and the previously dried primary sludge is dried. The mixed sludge is introduced into the mixed sludge inlet 12 and rotated by a separate power generating means 1 installed on the inner lower surface of the dryer 16 so as to be micronized to particles capable of fluidization. A plurality of paddles 3 are mounted and fixed on the driven shaft 2 and a chopper 4 is installed in the middle of the paddles 3. The sludge finely divided by the rotational and frictional forces of the paddle 3 and the chopper 4 is first evaporated to dry by directly contacting the hot air and the superheated steam supplied while the supply amount is properly controlled through the heat supply pipe 6. The finely divided particles are rapidly dried in a secondary manner as they flow into the airflow-dried duct 5 which is fluidized to form a flow stream.

At this time, a part of the vapor evaporated through the dryer 16, that is, the exhaust gas is used in the incinerator installed in connection with the present invention is used for the temperature control of the exhaust gas flowing into the dryer, the rest is through the duct scrubber The condenser is condensed in the vapor condenser, and the gas generated after the condensation is mixed with the inlet air of the incinerator, and the cooling of the condenser used here uses a cooling tower.

On the other hand, the waste heat generated in the incinerator is about 850 ℃ mixed with air at room temperature supplied from the air filter is adjusted to about 100 ℃ and filtered in the bag filter, the ash is stored in the ashbin, the filtered air is It has a configuration to be discharged to the atmosphere from the tech.

In the case of drying by the above configuration, the sludge is undifferentiated at the same time as it is dried, and it can be burned by spraying it directly into the incinerator like heavy oil, and the structure of the incinerator can be manufactured very simply while increasing the combustion efficiency. In addition, most of the gaseous pollutants such as odor generated while drying sewage sludge can be treated by combustion, so it is possible to stably remove secondary pollutants while minimizing energy when linking drying and incineration. .

Therefore, the present invention is applied to the sewage and wastewater treatment plants, and the water in the sludge is removed for the composting and incineration of various sludges discharged from these places, thereby enabling the reduction, resourceization, and energyization. Proposed to solve this problem, the sewage and wastewater sludge is dried and recycled to solid fuel and compost to maintain the utility as a resource for sewage and wastewater sludge, and maximize the energy efficiency in drying and incineration. In connection with this, the treatment fundamentally eliminates the generation of waste water and odor generated.

Such a drying device can be used for reducing and stabilizing sewage, wastewater sludge and food residues, and in the case of containing harmful substances, it is economically innocuous when the drying device of the present invention is integrated with incineration. It is possible to design and manufacture in a relatively simple way, as well as easy to operate has a useful value.

Claims (1)

Sewage and wastewater sludge produced in various treatment plants and pre-dried primary dry sludge are mixed with each other and the mixed sludge is put into a drier, and the sludge is installed at the bottom of the drier so that the mixed sludge can be dried. A heat supply pipe configured to supply hot air and superheated steam; A stirring paddle and a chopper (pulverizer) rotated and driven by a power generating means installed at the bottom of the dryer so that the sludge dried to some extent is finely divided and first evaporated to dry; It is fluidized and dispersed by the airflow of the hot air and superheated steam, so that the airflow drying duct is provided at the top to enable complete drying by secondary drying. Agitation paddle airflow drying apparatus for treatment of sewage and wastewater sludge, characterized in that the merged.