KR100789955B1 - High density sludge and waste water treatment apparatus - Google Patents

Abstract

An apparatus for treating high concentration sewage or wastewater is provided to purify effectively sewage or wastewater by allowing air supplied into an aeration tank to stay in sewage or wastewater for a long time and easily settling suspended solids contained in sewage or wastewater filled in the aeration tank. An apparatus for treating high concentration sewage or wastewater comprises a solid-liquid separator, a scum remover, an aeration tank(200), and a post-treatment equipment, wherein the aeration tank includes: a tank filled with sewage or wastewater; an air supply pipe for supplying air to a bottom part of the tank; a sewage or wastewater circulating pipe(240) for circulating sewage or wastewater positioned in an upper part of the tank to the bottom part of the tank; and a plurality of air stagnating plates(250) which are formed in the lateral direction of the tank, and have a plurality of exhaust holes formed therein. The air stagnating plates include a plate in which a plurality of holes are formed, a plurality of air stagnating parts fixed correspondingly to some of the plurality of holes of the plate, and a plurality of settling guide parts fixed to the residual holes of the plate such that apexes of the settling guide parts are formed downward.

Description

High Density Sludge and Waste Water Treatment Apparatus

The present invention relates to a wastewater treatment apparatus, and in particular, after separating the suspended solids contained in the wastewater, to purify the high concentration of wastewater from which the suspended solids are separated.

The high concentration of wastewater treatment, which was recently relying on dumping at sea under the London Convention, requires economic and complete high concentrations of wastewater treatment technology and systems.

Conventional high concentration wastewater treatment methods do not consider the size and nature of the suspended solids (SS) in high concentration wastewater, and generally separated by using a centrifuge (Telcanta), according to the size and nature of the suspended solids (SS) Difficulty in separation In addition, the wastewater treatment method was composed of anaerobic digestion tank, general aeration tank, denitrification and dephosphorization, and membrane separation process.

However, the conventional high concentration wastewater treatment method does not consider the size and nature of the suspended solids in the wastewater, making it difficult to separate the solids. By using a general aeration tank, the contact time between the air and the wastewater blown into the aeration tank is shortened to increase the dissolved oxygen of the wastewater. Difficult to make.

The present invention has been invented to solve the problems of the prior art as described above, by extending the time the air supplied to the aeration tank stays in the waste water, while increasing the amount of dissolved oxygen in the waste water and at the same time floating solids remaining in the waste water It is an object of the present invention to provide a high concentration wastewater treatment apparatus configured to effectively purify wastewater using an aeration tank configured to settle smoothly.

The high concentration wastewater treatment apparatus of the present invention for achieving the above object is a solid-liquid separator for separating the suspended solids from the waste water, and filling the wastewater from which the suspended solids are separated from the solid-liquid separator and injecting air into the fine A scum removal device that removes suspended solids and oil (oil), and an aeration tank that fills the wastewater from which the fine floating solids and oils are separated from the scum removal device and injects air to aerated to increase the amount of dissolved oxygen, and the amount of dissolved oxygen And a post-treatment apparatus for purifying the increased waste water with the discharge water quality, wherein the aeration tank includes a tank filled with the waste water, an air supply pipe for supplying air to the bottom of the tank, and the waste water located at the top of the tank. Waste water circulation pipe to circulate negatively, and is located in the transverse direction of the tank and a plurality of exhaust holes formed And in that it comprises a number of air stagnation plate with technical features.

In addition, according to a preferred embodiment of the present invention, the air stagnant plate, the exhaust hole is formed in the side portion in the form of a flat plate with a plurality of holes, the upper end is closed and the lower part of the plurality of holes of the flat plate And a plurality of air stabilization parts fixed in correspondence to the holes of the hole, and a plurality of sedimentation guide parts formed at the vertices in the shape of a solid shape and fixed to the vertex downwards in the remaining holes of the plate. The precipitation guide portion is fixed in an alternating pattern among a plurality of holes formed in the plate.

In addition, according to a preferred embodiment of the present invention, the air distribution plate is fixed to the upper side of the air supply pipe in the transverse direction of the tank, the hole is formed uniformly throughout the air injection plate.

In addition, according to a preferred embodiment of the present invention, the waste water aerated in the aeration tank is stored in the sedimentation tank, and the supernatant is drained by a post-treatment apparatus to be post-treated.

In addition, according to a preferred embodiment of the present invention, the post-treatment apparatus is either a plasma processor or a titanium dioxide photocatalyst.

In addition, according to a preferred embodiment of the present invention, the solid-liquid separator includes a mixer for mixing the high concentration of waste water and water, and a dehydrator for separating the suspended solids from the mixed water mixed in the mixer.

In addition, according to a preferred embodiment of the present invention, the dehydrator, a solid-liquid separation dehydrator for separating the suspended solids from the mixed water located therein by rotating the cylindrical mesh network, the suspended solids separated from the solid-liquid separation dehydrator cylindrical mesh network Located inside of the screw comprises a screw dehydrator for rotating the screw to decompress the suspended solids in a cylindrical mesh network.

As described above, the high concentration wastewater treatment apparatus of the present invention has the advantage that the air supplied to the aeration tank stays in the wastewater for a long time, thereby effectively increasing the dissolved oxygen amount in the wastewater to improve the purification function.

In addition, the high concentration wastewater treatment apparatus of the present invention has an advantage of improving the purification function by configuring the suspended solids contained in the wastewater filled in the aeration tank easily.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a high concentration wastewater treatment apparatus according to the present invention will be described in detail.

1 is an opening diagram of a high concentration wastewater treatment apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the aeration tank shown in FIG. 1, and FIG. 3 is a flow of air in A shown in FIG. And a schematic diagram showing the precipitation direction of the suspended solids, FIG. 4 is a side cross-sectional view showing a mixer in the solid-liquid separator shown in FIG. 1, and FIG. 5 is a side cross-sectional view showing a solid-liquid separator in the solid-liquid separator shown in FIG. 1. 6 is a side cross-sectional view showing a screw dehydrator in the solid-liquid separator shown in FIG. 7 is a photograph showing turbidity after plasma treatment.

As shown in Figure 1, the high concentration wastewater treatment device is a solid-liquid separator 100 for separating the suspended solids and waste water from the high concentration of waste water, and fills the waste water from which the suspended solids separated from the solid-liquid separator 100 and air The scum removal device 135 which injects and floats the fine floating solids and oil (oil), which floats on the upper part, and the wastewater in which the fine floating solids and oil are separated from the scum removing device 135 are filled and dissolved by injecting air. Aeration tank 200 for aeration treatment to increase the amount of oxygen, Precipitation tank 300 for separating the supernatant by precipitating the suspended solids contained in the aerated waste water, and the post-treatment device for plasma treatment or titanium dioxide photocatalyst treatment of the supernatant water And 400, the treated supernatant is discharged to sewage through a filtration process.

Hereinafter, the high concentration wastewater treatment apparatus configured as described above will be described in detail.

As shown in Figure 1, the high concentration of waste water is introduced into the solid-liquid separator 100 to separate the suspended solids from the waste water.

Solid-liquid separator 100 is largely divided into a mixer 110, solid-liquid separator dehydrator 120 and screw dehydrator 130, as shown in Figure 4 mixer 110 is a waste water and purified water treatment It includes a tank 111 to be mixed and stored, the inside of the tank 111, a stirrer 113 is installed. Therefore, when the stirrer 113 is operated, the waste water and the treated water filled in the tank 111 are mixed to control the concentration of the waste water. The volume ratio of high concentration wastewater to treated water is 1 to 1.

The high concentration wastewater and treated water are supplied to the solid-liquid separation dehydrator 120 as shown in FIG. 5 after the concentration is adjusted to the mixed water in the mixer 110.

Solid-liquid separation dehydrator 120 is rolled through a cylindrical mesh screen of 0.03mm to 0.5mm in a cylinder and inclined so that the mixed water flows in a high direction, and penetrates in the longitudinal direction of the mesh network 121. It is provided with a rotating shaft 123 fixed to the mesh network 121 in one state, and a motor 135 for rotating the rotating shaft 123, and after putting the mixed water into the higher side of the mesh network 121, the motor 135 Rotating the mesh network 121 using), while the solid is rotated to move to the lower side along the inclination of the mesh network 121, the waste water is discharged to the outside through the mesh network 121.

The separated waste water is transferred to the aeration tank 200 through the scum removal device 135 described later, and the sludge remaining inside the mesh net 121 is transferred to the screw dehydrator 130.

As shown in FIG. 6, the screw dehydrator 130 includes a cylindrical mesh net 131, a screw 133 positioned longitudinally inside the mesh net 131, and a motor for rotating the screw 133. A screw 135 of the screw 133 has a structure in which the pitch is narrowed from the rear to the front. Therefore, when the sludge is put into the rear end of the cylindrical mesh net 131 and the motor 135 is driven, the sludge is moved forward along the screw 133 and is compressed in front of the screw 133, so that the waste water contained in the sludge is mesh net 131 ) Is discharged to the outside, and the solids of the sludge remain in the cylindrical mesh network 131. As such, the solids of the sludge remaining in the cylindrical mesh net 131 are subsequently disposed of through a drying process, and the waste water discharged to the outside through the cylindrical mesh net 131 is passed through the scum removing device 135 to the aeration tank 200. The scum removing device 135 is already commercialized, and detailed description thereof will be omitted.

On the other hand, although not shown in the drawings, the solid-liquid separation dehydrator 120 and the screw dehydrator 130, the receiving stand receiving the discharged waste water, and the inlet pipe extending from the receiving stand to the scum removing device 135 is installed. . Therefore, the wastewater discharged from the solid-liquid separation dehydrator 120 and the screw dehydrator 130 flows smoothly into the scum removing device 135 through the inlet pipe.

The scum removing device 135 fills the wastewater from which the suspended solids are separated from the solid-liquid separator 100 and injects air to remove the fine-floating solids and oil (oil), which float on the upper portion. Then, the waste water from which the fine-floating solids and oil (oil) and the like are removed flows into the aeration tank 200 and is filled in the aeration tank 200.

As shown in FIG. 2, the aeration tank 200 includes a tank 210 in which waste water is filled, an air supply pipe 230 extending to the bottom of the tank 210 to supply air, and the tank 210. The waste water circulation pipe 240 extended to the bottom portion so as to circulate the waste water to the bottom portion of the tank 210, and positioned in the transverse direction of the tank 210 to prevent the rise of air while passing through the solids It includes a plurality of air stagnation plate 250 is formed.

Looking at the aeration tank 200 in detail, the waste water drainage pipe 280 is connected to the bottom of the cylindrical tank 210, both ends of the waste water circulation pipe 240 is connected to the top and bottom of the tank (210). On the other hand, the inlet pipe 290 extended from the solid-liquid separation dehydrator 120 and the screw dehydrator 130 described above is extended to the waste water circulation pipe 240. In addition, valves 243, 283, and 293 are installed in front of the wastewater circulation pipe 240 at the connection point between the wastewater drainage pipe 280, the inflow pipe 290, and the wastewater circulation pipe 240 and the inflow pipe 290, respectively. .

On the other hand, the air supply pipe 230 extends through the tank 210 to the bottom of the tank 210.

A plurality of holes 231 and 241 are formed in the waste water circulation pipe 240 and the air supply pipe 230 located at the bottom of the tank 210. Therefore, the waste water is supplied into the tank 210 from the waste water circulation pipe 240, and air is supplied into the tank 210 from the air supply pipe 230.

The air distribution plate 220 is fixed to the upper side of the air supply pipe 230 in the transverse direction of the tank (210). The air dispersion plate 220 has a plurality of holes 221 are uniformly formed in the entire air distribution plate 220 so that the air discharged from the air supply pipe 230 is uniformly distributed throughout the tank 210 cross-section.

Therefore, the air rising from the bottom to the top is uniformly dispersed throughout the cross section of the tank 210 while passing through the hole 221 of the air dispersion plate 220.

On the other hand, the top of the air dispersion plate 220, the air stagnation plate 250 is located in the transverse direction of the tank 210 in multiple layers.

The air stagnation plate 250 has a plate 251 having a plurality of holes formed therein, and an exhaust hole 261 is formed at a side thereof in the form of a tube closed at an upper end thereof, and a hole of a part of the plurality of holes of the plate 251 is formed. Air stabilization portion 260 is fixed, and a hole is formed at the vertex in the form of a solid, and comprises a sedimentation guide portion 270 convexly fixed to the remaining hole of the flat plate 251, air stagnation portion 260 And the precipitation guide part 270 is fixed along the circumference of the plate 251 in an alternating pattern among the holes formed in the plate 251. In addition, the upper and lower air stagnation plates 250 are positioned such that the air stagnation portion 260 and the precipitation guide portion 270 formed therein correspond to each other as shown in FIG. 2.

The air stagnation plate 250 is fixed in the transverse multilayer in the tank 210. Therefore, the air passing through the air dispersion plate 220 is mostly introduced into the air stagnation part 260 and trapped in the closed part. As the amount of air trapped inside the air stagnation part 260 increases, the air is increased. The level of wastewater inside the stagnant portion 260 is lowered. At this time, when the water level of the waste water is lowered below the exhaust hole 261 formed on the side of the air stagnation portion 260, some air is raised upward through the exhaust hole 261. As the air discharged from the air supply pipe 230 rises as described above, the longer the stagnant time is in the air stagnation unit 260, the longer the contact time of waste water and air increases, and the amount of dissolved oxygen increases in proportion. Here, the exhaust hole 261 is formed obliquely to be lowered from the inside of the air stagnation portion 260 to the outside. The sum of the cross-sectional areas of the exhaust holes 261 is designed to be smaller than the cross-sectional area of the air supply pipe 230. By designing in this way, the air is blown out to the exhaust hole 261 by the floating pressure, thereby increasing the contact time with the air and the waste water contact surface.

On the other hand, the suspended solids contained in the waste water is settled down by gravity when the supply of air is stopped, and the suspended solids precipitated are introduced into the precipitation guide unit 270 which is alternately located with the air stagnation unit 260. . The suspended solids introduced into the sedimentation guide 270 is directed toward the sedimentation guide 270 of the air stagnant plate located below while sedimenting down through the hole formed at the vertex of the solid shape. On the contrary, when air is continuously supplied into the aeration tank 200 through the air supply pipe 230, the suspended solids are decomposed by colliding with the rising air.

The following describes the operation relationship of the aeration tank configured in this way.

In order to fill the waste water inside the tank 210, the valve 283 of the waste water drain pipe 280 and the valve 243 of the waste water circulation pipe 240 are closed, and the valve 293 of the inflow pipe 290 is opened. The waste water is filled in the tank 210.

When the waste water is filled in the tank 210, the valve 293 of the inflow pipe 290 is closed, and after the valve 243 of the waste water circulation pipe 240 is opened, a pump mounted on the waste water circulation pipe 240 ( 245) and the blower 235 mounted to the air supply pipe 230 circulates the waste water filled in the tank 210, and at the same time supplies air into the tank 210.

The air supplied in this way (the moving direction of the solid line) rises upward through the holes 221 of the air dispersion plate 220 as shown in FIG. 3 and proceeds, and the air stagnant portion ( 260) filled inside. When the amount of air filled in the air stagnation portion 260 is increased, the air is exhausted to the outside of the air stagnation portion 260 through the exhaust hole 261 and rises again to the air stagnation plate 250 located at the upper portion. Air arriving at the air stagnation plate 250 located above is also exhausted through the exhaust hole 261 in the state located in the air stagnation unit 260.

As air continues to be supplied into the aeration tank 200 as described above, the waste water is circulated to increase the dissolved oxygen in the waste water, and the suspended solids collide with the rising air to be decomposed even smaller.

On the other hand, when the supply of air is suspended, the suspended solids suspended in the waste water (dotted dashed line in FIG. 3), as shown in FIG. 3 by gravity, moves the precipitation guide part 270 of the air stagnation part 260. It is settled down through, and eventually sinks to the top surface of the air retention plate 250 or the bottom surface of the tank 210. By decomposing and ingesting suspended solids, that is, organic matter, in which microorganisms are settled in this state, high molecular weight organic matter generates low molecular weight organic matter and volatile fatty acids (VFA), and in the absence of oxygen, endogenous denitrification is achieved to efficiently purify wastewater.

On the other hand, the waste water drained from the aeration tank 200 is introduced into the settling tank 300 to precipitate the suspended solids contained in the waste water. In this way, in the suspended solids precipitated, the supernatant is pumped through the after-treatment device 400.

The post-treatment apparatus 400 is a plasma processor 410 or a titanium dioxide photocatalyst 420, and improves the water quality of the supernatant water through any one treatment apparatus.

The plasma processor 410 and the titanium dioxide photocatalyst 420 used in such a post-treatment process are already commercially available, and a detailed description of the plasma processor 410 and the titanium dioxide photocatalyst 420 will be omitted.

The supernatant passes through the plasma processor 410 and the titanium dioxide photocatalyst 420, and sterilizes the bacteria in the wastewater due to oxidation and decomposition, odor removal, turbidity removal, color removal, and strong sterilizing power of hardly decomposable organic and inorganic materials. .

For plasma treatment, the supernatant is passed through a plasma processor, and the supernatant passed through the plasma processor 410 is activated, and then sterilized while passing through a sterilizer 430 such as ozone, radicals, and ultraviolet rays.

The sterilized supernatant passes through the membrane filter 440 and is purified by effluent.

On the other hand, although the screw dehydrator in the solid-liquid separator as an example, in some cases, the belt dehydrator may be replaced.

EXAMPLE

The food waste leachate was separated by a solid-liquid separator, and the generated sewage was treated in the aeration tank for 24 hours and then precipitated. The supernatant was treated by the plasma method to obtain the results shown in Table 1 below.

[Table 1] Result of food waste high concentration sewage treatment (mg / L)

division BOD COD SS T-N T-P General bacteria Influent 82,780 63,150 35,800 2,895 587 5,650 Aeration tank 1,820 2,124 2,825 1,522 13.0 - plasma 8 11.2 21.0 20.0 2.0 0 Effluent water quality standard 30 40 30 60 8 3,000

On the other hand, Figure 7 is a photograph showing the turbidity after the plasma treatment, it is a photograph showing the turbidity of the supernatant according to the time the plasma treatment of the supernatant.

As described above, the high concentration wastewater treatment apparatus according to the present invention overcomes the problems of high concentration wastewater treatment through a breakthrough aeration tank and plasma treatment process.

1 is an opening diagram of a high concentration wastewater treatment apparatus according to an embodiment of the present invention,

2 is a cross-sectional view of the aeration tank shown in FIG.

Figure 3 is a schematic diagram showing the progress of air and precipitation direction of suspended solids in A shown in Figure 2,

Figure 4 is a side cross-sectional view showing a mixer in the solid-liquid separator shown in Figure 1,

Figure 5 is a side cross-sectional view showing a solid-liquid separation dehydrator of the solid-liquid separator shown in Figure 1,

Figure 6 is a side cross-sectional view showing a screw dehydrator in the solid-liquid separator shown in FIG.

7 is a photograph showing turbidity after plasma treatment.

Explanation of symbols on the main parts of the drawings

100: solid-liquid separator 110: mixer

120: solid-liquid separation dehydrator 130: screw dehydrator

200: aeration tank 210: tank

220: air dispersion plate 230: air supply pipe

240: wastewater circulation pipe 250: air stagnant plate

260: Air stagnation 270: Sedimentation guide

280: wastewater drainage pipe 290: inflow pipe

300: sedimentation tank 400: after-treatment device

410: plasma processor 420: photocatalyst

430: sterilizer 440: filter

Claims (7)

Solid-liquid separator 100 for separating the suspended solids from the waste water; and filling the waste water from which the suspended solids are separated in the solid-liquid separator 100 and injecting air into the fine-floating solids and oil (oil) Scum removal device to remove the 135; And, aeration tank 200 to fill the waste water from which the fine floating solids and oil separated from the scum removal device and aeration to increase the dissolved oxygen amount; and, the amount of dissolved oxygen And a post-treatment device 400 for purifying the waste water to discharged water quality. The aeration tank 200 is a tank 210 in which waste water is filled, an air supply pipe 230 for supplying air to a bottom portion of the tank, and a waste water circulation tube 240 for circulating waste water located at an upper portion of the tank to a bottom portion. And a plurality of air stabilization plates (250) positioned in the transverse direction of the tank and having a plurality of exhaust holes formed therein. The method of claim 1, The air stagnation plate 250, In the form of a flat plate 251 having a plurality of holes, and the upper end is closed in the form of the exhaust hole 261 and a plurality of air is fixed at the bottom corresponding to the hole of some of the plurality of holes of the flat plate It includes a stagnant portion 260 and a plurality of sedimentation guide portion 270 is formed in the form of a hole in the vertex and fixed to the vertex downward position in the remaining holes of the plate, The air stagnant portion and the sedimentation guide portion is a high concentration wastewater treatment apparatus, characterized in that fixed in an alternating pattern of a plurality of holes formed in the plate. The method of claim 2, The upper portion of the air supply pipe air dispersion plate 220 is fixed in the transverse direction of the tank, the high concentration wastewater treatment apparatus, characterized in that the hole is formed uniformly throughout the air injection plate. The method according to any one of claims 1 to 3, The waste water aerated in the aeration tank is stored in the sedimentation tank 300, the high concentration wastewater treatment apparatus, characterized in that the post-treatment by draining the supernatant water to the after-treatment device. The method according to any one of claims 1 to 3, The post-treatment device is any one of a plasma processor 410 or a titanium dioxide photocatalyst 420, characterized in that the high concentration wastewater treatment apparatus. The method of claim 1, The solid-liquid separator is, A mixer 110 for mixing high concentration wastewater and water, High concentration wastewater treatment apparatus comprising a dehydrator (120, 130) for separating the suspended solids from the mixed water mixed in the mixer. The method of claim 6, The dehydrator, Solid-liquid separation dehydrator 120 for separating the suspended solids from the mixed water located inside by rotating the cylindrical mesh network, High density wastewater treatment apparatus comprising a screw dehydrator 130 for placing the suspended solids separated from the solid-liquid separation dehydrator inside the cylindrical mesh network to rotate the screw to decompress the suspended solids in the cylindrical mesh network.

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