KR20010009597A - High-Rate Drying Bed - Google Patents

Abstract

PURPOSE: A high speed drying bed of sludge is provided, which can dry sludge of high moisture disposed from livestock farms rapidly in a drying bed filled with layers of gravel, sand and rice husk by injecting air through an air pipe(25) and by using the fermentation heat of sludge, so that the disposing problem of sludge from the livestock farmers is resolved and the dried sludge can be used as fertilizer. CONSTITUTION: The system comprises the followings: (i) a drying bed(20) of concrete structure that has an excess sludge inlet(10) at the top and a discharge line at the bottom, in which a gravel layer(22), a sand layer(23) and a rice husk layer(24) are set from bottom, the rice husk layer(24) having a settled sludge layer above it; (ii) an air pipe(25) installed between the sand layer(23) and rice husks layer(24) for feeding air to the bed(20); (iii) a supernatant discharge pipe(27) set at the level of the supernatant.

Description

High-Rate Drying Bed

The present invention relates to a high-speed sludge drying bed, by sequentially stacking a gravel layer, a sand layer and a rice husk layer on a dry bed made of a concrete structure, by installing an air pipe between the sand layer and chaff layer to supply air to dry the sludge at high speed A compostable sludge high speed drying bed.

Conventional livestock wastewater treatment facility is composed of screen, flow control tank, aeration tank, sedimentation tank and sludge storage tank, and uniformly adjusts the concentration and amount of waste water in the flow control tank to remove certain amount of organic pollutants The wastewater was introduced into the wastewater, and the wastewater was purified using activated sludge in the aeration tank and precipitated in the sedimentation tank. The supernatant was discharged to the external environment, and the precipitated sludge was transferred to the sludge storage tank for treatment.

At this time, the sludge transferred to the sludge storage tank went through the dehydration process by the dehydrator, or was liquefied and treated, and dehydration by the dehydrator took a lot of facility and operating costs, so there was almost no place other than the large-scale public wastewater treatment plant. Requires storage tanks that can store surplus sludge for about 6 months. However, since many livestock farms are small, it is difficult to install large storage tanks, and legally, grassland can be sprayed according to the liquid spraying standards. And since it is difficult to secure the paddy field, many livestock farms have had many problems such as odor generation and crop growth inhibition by spraying excess sludge on the soil and fields.

In addition, as a method of drying the sludge, there is a drying method using a dry bed. The dry bed is a structure in which a sand layer of 10 to 23 cm depth is generally installed on a gravel layer of 20 to 46 cm. Dehydration proceeds and drying proceeds at the top. However, such a sludge drying method requires a lot of site and requires a dry area according to weather conditions, so in Korea, there are few places that are installed in the field.

SUMMARY OF THE INVENTION The present invention has been made in view of the prior art, and an object thereof is to provide a sludge high-speed dry bed capable of rapidly drying excess sludge generated in a livestock wastewater treatment facility.

In addition, another object of the present invention is to provide an improved sludge high-speed drying bed to reduce installation and maintenance costs and to facilitate maintenance in livestock farms.

1 is a plan view of a sludge high-speed dry bed according to an embodiment of the present invention,

2 is a cross-sectional view of the device,

3 is a plan view of the air piping of the apparatus.

*** Explanation of symbols for the main parts of the drawing ***

10: surplus sludge inflow pipe

20: dry phase

21: sludge distribution device 22: gravel layer

23: sand layer 24: chaff layer

25: air piping

252: non-return valve

27: supernatant discharge pipe

An object of the present invention as described above is to stack a gravel layer and a sand layer on the bottom of the drying phase made of concrete structure, and to accumulate chaff layer to prevent the freezing of the winter drying by the fermentation heat of organic material on it and to increase the drying speed of the sludge In addition, by providing an air pipe between the sand layer and the rice hull layer, the air is supplied by the sludge high-speed dry bed which can compost the sludge by high speed drying.

When the sludge is introduced into the drying phase, the sludge leachate filtered in the drying phase is discharged to the leachate outlet installed at the bottom of the drying phase, and after 3 to 6 hours have passed, the precipitated sludge supernatant is attached to the upper portion of the drying phase. Outflow along the pipe.

After that, the moisture contained in the sludge is removed by drying the sludge in the gravel layer, the sand layer and the rice hull layer. The drying time is shorter than the conventional dry phase by the air and sludge fermentation heat from the air pipe, and the required area of the drying phase and Due to the drastic improvement in unit sludge drying time, installation cost and maintenance cost of sludge drying are greatly reduced, and maintenance is easy.

As described above, embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

Example

1 is a plan view of a sludge high speed dry bed according to an embodiment of the present invention, FIG. 2 is a sectional view of the apparatus, and FIG. 3 is a plan view of an air pipe of the apparatus.

In the sludge high-speed dry bed according to the present invention, a dry bed 20 made of a concrete structure is laid with a gravel layer 22 and a sand layer 23 on the bottom, and the dry bed in winter 20 by fermentation heat of organic materials on the sand layer 23. To prevent freezing of the sludge and to increase the drying speed of the sludge is composed by layering the chaff layer (24). At this time, the lamination on the sand side 23 is not limited to chaff, and may be a coarse organic particle such as sawdust or the like, and is preferably 0.5-1 cm in length.

Between the sand layer 23 and the chaff layer 24 is provided with an air pipe 25 made of a porous plastic corrugated pipe to increase the drying effect and to promote aerobic fermentation of sludge.

As shown in FIG. 3, the air pipe 25 has a "▥" shape so as to be evenly disposed on the bottom of the dry phase 20 on the sand layer 23, and an opening / closing valve for injecting air to one side thereof ( 251 is installed and a check valve 252 is installed at the front end of the open / close valve 251 to prevent backflow of the leachate from the dry phase to the blower when sludge is introduced into the dry phase 20. At this time, the shape of the air pipe 25 is not limited to "▥", and may be a shape that can be evenly distributed throughout the bottom of the dry phase (20).

On the other hand, the sludge distribution device 21 for evenly spraying the sludge flowing from the excess sludge inlet pipe 10 connected to the livestock wastewater treatment facility to the drying phase is installed on one side of the drying phase 20, the drying phase ( The drainage hole 26 is installed at the bottom center of the bottom portion 20 and the bottom surface is inclined toward the drainage hole 26 so that the leachate in the dry phase is discharged into the drainage hole 26. The sludge distribution device 21 is capable of height adjustment up and down according to the inflow flow rate of the sludge introduced to increase the sludge distribution effect according to the sludge inflow amount.

In addition, the sludge introduced on the other side of the dry phase 20 precipitates so that the drying time of the sludge is shortened by discharging only the supernatant when the sludge 28 and the supernatant 29 form an interface. The supernatant discharge pipe 27 is provided freely in accordance with the interface between the sludge 28 and the supernatant 29.

Therefore, when sludge is introduced from the excess sludge inlet pipe 10 into the dry bed 20, the sludge leachate is filtered while passing through the chaff layer 24, the sand layer 23, and the gravel layer 22. The supernatant liquid is discharged to the leachate discharge port 26 installed on the bottom, and the supernatant separated from the precipitated sludge flows out along the supernatant discharge pipe 27 attached to the upper part of the dry phase 20.

Once the sludge leachate is discharged, the open / close valve 251 is opened and air is introduced into the air pipe 25 to remove moisture contained in the sludge. The air is introduced from the air pipe 25 and the sludge fermentation heat is generated. Drying time is shorter than dry phase.

As such, the sludge introduced from the livestock wastewater treatment plant is composted after the high-speed drying in the drying bed 20 to stably dry the sludge in four seasons, and the maintenance and management of the livestock wastewater treatment facility is simple and the sludge is dried. The cost of installing and maintaining the jacket is reduced.

The present invention is a sludge high-speed dry bed that can be composted by fast drying the sludge by supplying air by installing an air pipe between the sand layer and the chaff layer in order to stack the gravel layer, sand layer and chaff layer on the bottom of the drying phase made of concrete structure On the other hand, it is effective to solve the sludge disposal problem, which is time-consuming and difficult to manage in livestock wastewater treatment, so that stable livestock wastewater treatment can be performed even in livestock farms without specialized knowledge.

In addition, due to the heat of sludge fermentation in the air and rice hull bed from the air pipe, the drying time is shorter than that of the existing drying bed, and the required drying time and unit sludge drying time are drastically improved, thereby installing and managing the sludge drying cost. Costs are significantly reduced, and maintenance is easy.

Claims (7)

In the dry phase 20 including a gravel layer 22, a sand layer 23, which are sequentially stacked on a dry floor made of a concrete structure, the coarse organic particle layer 24 is laminated on the sand layer 23, and Sludge high-speed drying phase characterized in that the air pipe 25 of the porous plastic corrugated pipe is installed between the sand layer 23 and the coarse organic particle layer 24. The sludge high-speed dry bed according to claim 1, wherein the coarse organic particle layer (24) is a particle layer having a length of 0.5 to 1 cm. The sludge high speed dry phase according to claim 1, wherein the coarse organic particle layer (24) is a chaff layer. The sludge high-speed dry bed according to claim 1, wherein the coarse organic particle layer (24) is a sawdust layer. The sludge high speed dry bed according to claim 1, wherein a non-return valve (252) is further provided at one side of the air pipe (25). The sludge high speed dry bed according to claim 1, further comprising a sludge dispensing device (21) which is capable of height adjustment up and down according to the inflow flow rate of the sludge. The method of claim 1, wherein the upper portion of the upper side of the drying phase 20 is characterized in that the supernatant discharge pipe 27 that can be adjusted up and down according to the interface between the settling sludge 28 and the supernatant 29 is further installed. Sludge high speed drying phase.