KR20040087861A - A deposit's processing method and its system - Google Patents

Abstract

PURPOSE: A method and a system for treating sediment are provided to recover earth and sand contained in the sediment and supply an organic matter as nutrient for plants planted in the constructed wetland through physical treatment method using hydraulic cyclone and natural settling basin and natural purification method using constructed wetland. CONSTITUTION: The system comprises a sorter(10) for sorting thus removing coarse materials from bottom water containing sediment; a storage tank(20) in which the sorted coarse materials are stored; a reservoir(30) for storing the bottom water passing through the sorter; a hydraulic cyclone(40) formed in a multi-cyclone shape to separate the water into upper discharge water containing organic substance and lower discharge water containing earth and sand by flowing the water stored in the reservoir in the hydraulic cyclone in the state that the water is distributed through a central distribution tank(90); a gravity dewaterer(50) for obtaining the earth and sand from the lower discharge water; a natural settling unit(60) for separating sediment in which the organic substance is concentrated and supernatant water from the upper discharge water; an ozone treater(70) for removing a trace of contaminants contained in the supernatant water; and a constructed wetland(80) in which porous sintered body(82) is used as a filter and a plating media for plants(81) to treat the organic substance contained in the sediment.

Description

A deposit's processing method and its system

The present invention relates to a treatment method and system for subsurface sediment piled up on a lake and a river bottom, and a physical treatment method through a hydrocyclone and natural sedimentation tank and natural wetland using porous sintered aggregate as a planting medium for media and plants. Soils that can be used as resources through the purification method are recovered, and organic matters are consumed as nutrients of plants planted in artificial wetlands so that they can be treated and economically and environmentally friendly.

At present, the treatment of water sediment piled up on the appeal or the bottom of the river is usually done by discharging all the water in the appeal to the outside after collecting the sediment exposed to the appeal floor with heavy equipment. However, this treatment method is only a method of moving the sediment in the ground to the sediment on the ground, the secondary environmental pollution due to anaerobic decomposition of organic matter constituting the sediment, the outflow of nitrogen and phosphorus, etc. There is a problem that occurs.

In addition, in the case of an appeal or river that cannot be treated by the above method because the water supply source is large or large in size, the bottom of the sediment containing water is discharged to the outside of the water system using a suction pump and mixed with water. After sedimentation of sediment with flocculant in the loosened sediment, the sediment is dehydrated using a mobile dehydrator, and then reduced. The dehydration cake is treated by landfilling or incineration. In order to agglomerate and transport sediment in the sedimentation tank within a short time in the sedimentation tank, an anionic polymer flocculant such as polyamide is introduced at high concentration so that the coagulant remains in the supernatant discharged to the lake or river. To disrupt the aquatic environment or to present as a biodegradable organic contaminant. And, also, because there is still a need for secondary processing facilities and processing this enormous cost is a problem in that it takes in accordance with the atmospheric pollutants in waste water generated during the incineration and dehydration.

Therefore, all of the above methods result in another type of environmental pollution, which is inevitable due to the occurrence of secondary environmental pollution, and the latter in the case of enormous facility and treatment costs. Although there is no economical efficiency, and the sediment to be treated contains sediments such as aggregate or sand, which can be used as resources, it is forced to be landfilled, causing waste of fishery resources.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is to include the water sediment in the water sediment through the physical treatment method using a hydrocyclone and natural sedimentation and the natural purification method using artificial wetland. The collected soil material is recovered and resourceized, and the organic material is supplied as nutrients of plants planted in artificial wetlands to be treated economically and environmentally.

To this end, the present invention is to raise the bottom of the lake or river sediment containing sediment, using the hydrocyclone in the form of a multi-cyclone to efficiently separate the water containing the soil and the water containing the organic soil This water is dehydrated to be reused as a resource. Water containing organic matter is separated into sediments and supernatant concentrated with organic matter using natural sedimentation tank, and only the supernatant is discharged by disinfection by ozone. However, sediments are introduced into artificial wetlands where plants are planted to remove the organic matter contained in the sediments for use as a nutrient source for plants.

1 is a process chart of the present invention.

Figure 2 is an overall view showing the arrangement according to an embodiment of the present invention.

Figure 2a is an enlarged layout of the sorting device, hydrocyclone, gravity sedimentation device.

Figure 2b is a separation state of the top discharge and the bottom discharge through the hydrocyclone.

Figure 3 is a perspective view showing the structure of the sorting device.

Figure 4 is a perspective view showing the structure of the locking net.

5 is a plan view showing a connection structure of the central distribution tank and the hydraulic cyclone.

Figure 5a is a cross-sectional view showing a connection structure of the central distribution tank and the hydraulic cyclone.

6 is a sectional view showing the structure of a hydrocyclone;

Figure 6a is an exploded cross-sectional view showing the structure of the hydrocyclone.

Figure 7 is a partial cross-sectional view showing the structure of the lower discharge portion of the hydraulic cyclone.

Figure 7a is a partial exploded cross-sectional view showing the structure of the lower discharge portion of the hydraulic cyclone.

Figure 8 is a cross-sectional view showing the structure of the gravity settling device.

9 is a sectional view showing the structure of the artificial wetland.

<Description of the symbols for the main parts of the drawings>

10: sorting device 20: large storage tank

30: bottoms storage tank 40: hydrocyclone

50: gravity dehydration device 60: natural sedimentation device

70: ozone treatment device 80: artificial wetland

90: central distribution tank 100: lower discharge storage tank

110: upper discharge reservoir

Figure 1 shows the treatment process of the present invention, the bottom of the water containing sediment accumulated on the bottom of the lake or river to the top of the water system to remove the coarse water through the screening process, and the coarse water is removed A centrifugal force separation step for separating and separating the bottoms into an upper discharge containing organic matter and a lower discharge containing sediment, and a gravity dewatering step for obtaining only the soil from the lower discharge and using it as an aggregate resource; , A natural sedimentation step for separating organic concentrates from the top discharge and the supernatant, an ozone treatment step for removing trace organic matter remaining in the separated supernatant water, and organic matter contained in the separated sediment porous sintered body It is to include an organic treatment step of processing by flowing into the artificial wetland formed by the planting medium of the media and plants.

At this time, the coarse material removing step is to filter out various kinds of non-utility as a resource, and then filter the contaminated material to be recovered or removed through storage and landfill treatment. As the process passes, the removal efficiency of the coarse matter can be increased.

Hereinafter, a system for treating water sediment by the treatment method of the present invention will be described, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail.

First, Figure 2 shows a treatment system of the present invention, the sorting device 10 for removing the coarse material by lifting the bottom water containing the water sediment to the top of the water system, and sorted through the sorting device 10 The principle of centrifugal force is applied to the water storage tank 20 for storing the coarse material, the bottom water storage tank 30 for storing the bottom water passing through the sorting device 10, and the water stored in the bottom water storage tank 30. Hydraulic cyclone 40 for separating organic wastes containing the upper discharge and the lower discharges containing the soil, and a gravity dewatering device for receiving the soil discharge from the hydraulic cyclone 40 to obtain the soil 50) and the natural sedimentation device 60 for separating the sediment containing concentrated organic matter and the supernatant from the upper discharge from the hydrocyclone 40 and removing the trace contaminants contained in the separated supernatant. Discharge The ozone treatment device 70 for locking and the separated sediment are introduced to absorb the organic matter contained in the sediment into the nutrients of the plant 81 and the porous sintered body 82 is formed as a filter and filtered. After that is composed of artificial wetland 80 to be discharged through the filtered water collecting pipe (83).

Hereinafter, the treatment system process by the more detailed configuration and operation of each system constituting the treatment system of the subsurface sediment is as follows.

The sorting device 10 is composed of soil sediment, animal and carcass and fluids, living and agricultural wastes, and other air permeable wastes accumulated at the bottom of the lake or river at the previous stage introduced into the hydrocyclone 40. It is provided to remove the solids consisting of a large standard and a special material first, the selected coarse is dropped into the coarse storage tank 20 is disposed in the lower portion of the sorting device 10, as shown in Figure 2a The bottom water passed after the coarse material is removed is to be stored in the storage tank (30).

At this time, the sorting device 10 is a dual screen structure having a primary screen 11 and a secondary screen 12, as shown in Figure 3 is made of a structure that can increase the removal efficiency of the coarse solids.

Subsequently, the bottom water stored in the bottom water storage tank 30 is transported to the hydraulic cyclone 40 by the transfer pipe 32 by the transfer pump 31, and the transfer pipe 32 is the bottom water. It is installed to extend to the bottom of the storage tank 30 and the lower end of the transfer pipe 32 is provided with a strainer 33 is extended to limit the size of the solids flowing through the transfer pipe 32 to the hydraulic cyclone 40 The clogging phenomenon of the lower discharge port 41 due to the sediment separated from the hydraulic cyclone 40 at the time of the feeding is prevented.

At this time, the strainer net 33 is installed in the transfer pipe 32 is made of a circular structure as shown in Figure 4, the length (gap size) between the mesh of the strainer 33 is the lower discharge port of the hydraulic cyclone (40) 41) The size of the strainer 33 according to the diameter of the lower discharge port 41 is limited because it must be maintained at 30% or less of the diameter.

On the other hand, the bottom water to be conveyed through the transfer pipe 32 is transported to each of the hydraulic cyclones 40 when the hydraulic cyclone 40 is installed in the form of a multi-hydraulic cyclone composed of a small as shown in FIG. The central distribution tank 90 for distributing and conveying the bottom water is installed, and in this case, a bypass pipe is provided in the transfer pipe 32 to prevent a water pressure excess phenomenon of the floor flowing into the central distribution tank 90. (34) is branched so that the bypass amount is controlled by the bypass valve 34a, and the inflow amount of the hydraulic cyclone 40 is controlled by the inlet control valve 42a.

At this time, the stirrer 35 is installed in the bottom water storage tank 30 for mixing with the bottom water bypassed from the central distribution tank 90 and preventing precipitation of organic matter contained in the bottom water.

Subsequently, the bottom water conveyed to the hydrocyclone 40 through the central distribution tank 90 or the transfer pipe 32 exhibits a separation phenomenon by centrifugal force action by the primary vortex, and has a solid having a specific gravity higher than that of the water. Water is discharged through the lower discharge port 41 of the hydraulic cyclone 40, the discharge containing organic matter is discharged through the upper discharge port 43 of the hydraulic cyclone (40).

At this time, the separation particle diameter of the hydrocyclone 40 (= Ds ₅₀ : 50% of the particles to be discharged to the upper and lower discharge ports, respectively) to be controlled to be in the range of 1 ~ 2μm, the separation efficiency of the normal cyclone When the flow rate into the cyclone is fixed, the length of the cylinder separator (cylindrical section) is long, the diameter of the centrifugal separator (cylindrical section) is smaller, and the diameter of the lower discharge port is smaller, so that Ds ₅₀ becomes smaller. Because of this improvement, it is necessary to examine the particle size distribution of the influent into the cyclone to determine Ds _50, and then design the cyclone accordingly.

However, since the fine particles such as the soils contained in the subsurface sediment to be treated in the present invention vary greatly depending on the sedimentation site and the suction conditions of the sediment, the separation efficiency of the cyclone according to the concentration of these particles is changed first. It is desirable to investigate the particle concentration of the subsurface sediment and then design a suitable cyclone.

On the other hand, the hydrocyclone 40 in the present invention is a multi-cyclone consisting of a plurality of cyclones having a small diameter of the centrifuge because the separation efficiency is higher as the diameter of the centrifuge is smaller for the separation of particulate solid particles such as soils It is intended to have a form, it is possible to vary the length of the cylindrical portion and the diameter of the lower discharge port in accordance with the characteristics of the water sediment flowing into the hydraulic cyclone (40) to obtain the most economical and maximum separation efficiency.

That is, the hydrocyclone 40 in the present invention has a double cylindrical structure of the inner cylinder 45 which is movable below the outer cylinder 44 and the outer cylinder 44 as shown in FIGS. 6 and 6A. In this case, the inner cylinder 45 is tightly fixed to the outer cylinder 44 by tightening the screw 49a of the fixing band 49, and the inner cylinder 45 is fixed by loosening the screw 49a of the fixing band 49. Since the movement of the 45 is possible, the length of the centrifugal separator can be extended or reduced by a simple operation in the field, and the outer cylinder 44 and the inner cylinder 45 are fixed and moved by the fixing band. Various means for performing the same role as (49a) can be used.

In addition, the hydraulic cyclone 40 in the present invention is the adjustment plate fixing part 47 of the cylindrical structure that can be pulled out by screwing into the lower discharge port 41 of the hydraulic cyclone 40 as shown in Figure 7 and 7a. Is formed, and a plurality of discharge hole diameter control plates 46 having a through hole 46a for determining the size of the cyclone lower discharge port 41 are formed inside the control plate fixing part 47 so as to be made of Teflon and mounted thereon. The diameter of the discharge port 41 can be adjusted.

That is, the discharge hole diameter control plate 46 is mounted to be stacked in the order of gradually expanding the diameter of the through hole 46a from the lower portion of the adjustment plate fixing portion 47, the discharge hole mounted at the bottom from the control plate fixing portion 47 portion Pulling out from the diameter adjusting plate 46, the diameter of the cyclone lower discharge port 41 can be gradually increased.

At this time, the lower portion of the adjustment plate fixing part 47 is attached to the optical sensor 48 to monitor the blocked state of the lower discharge port.

Thereafter, most of the lower discharge discharged through the lower discharge port 41 of the hydraulic cyclone 40 is sand-like soil, and the dewatered soil is transported to the gravity type dehydration apparatus 50 to which the dewatering network is attached. It can be reused as aggregate material of aggregate or civil engineering works, and the dehydrated water is discharged to the artificial wetland 80.

At this time, a lower discharge reservoir 100 for temporarily storing the lower discharge discharged from the hydraulic cyclone 40 to the gravity dewatering device 50 is provided, and the discharge port of the lower discharge reservoir 100 is provided. 101, the outflow amount control valve 101a is mounted so that the outflow amount can be additionally controlled.

On the other hand, the upper discharge discharged through the upper discharge port 43 of the hydraulic cyclone 40 is to be transferred to the gravity sedimentation device 60 in the manner of natural drop or forced transfer, at this time natural acupuncture device (60) The upper discharge storage tank 110 for temporarily storing the upper discharge material before the transfer to the c) is provided, and an outlet flow control valve 111a is installed at the discharge port of the upper discharge material storage tank 110 to further install the discharge amount to control the discharge. It can be.

At this time, the gravity sedimentation device 60 is installed on the inlet water distribution plate 61 inclined downward with an inclination angle of 15 ° on the upper discharge inlet as shown in FIG. 60) so that the upper discharge introduced into the top drop in a state dispersed entirely on the upper surface of the inlet distribution plate 61 to minimize the generation of vortices in the sedimentation tank so that the organic and ultra-fine soil contained in the upper discharge By minimizing the disturbing effect on the sedimentation action of the particles, it is possible to increase the separation efficiency of the sediment with concentrated organic matter and the supernatant.

In this case, when the inclination angle of the influent distribution plate 61 is less than 15 °, the soil particles of the fine particles contained in the upper discharge may remain on the upper surface of the influent distribution plate 61, and are larger than 15 °. In this case, disturbances in the settling tank may occur.

Then, after the sedimentation is completed by the gravity sedimentation device 60, the supernatant water is discharged to the lake or river after the pollutants contained in the supernatant water is removed through the ozone treatment 70, the sediment concentrated with organic matter is gravity When opening the valve 62 provided at the lower discharge port of the sedimentation device 60, the filtration action by the porous sintered body 82 introduced into the artificial wetland 80 configured as shown in FIG. 9 and filled in the artificial wetland 80 And after being absorbed and removed by the nutrients of the plant 81 planted in the artificial wetland 80, it is collected in the filtered water receiving pipe 83 installed on the bottom surface to the lake or river through the filtered water outlet (83a) It will be discharged.

At this time, the artificial wetland 80 is a puddle-shaped artificial wetland space is secured by the water-repellent film 84, and in the artificial wetland space, the applicant of the present invention (Oh Jun Sung) applied for a patent in 1997 and registered in 1999 (patent Porous sintered body 82 prepared by the "sintered aggregate and its manufacturing method" registration number 234149 is characterized in that it is filled with the planting medium of the image 81 and planting plant 81 in the artificial wetland (80).

At this time, the porous sintered body 82 is obtained by drying the sewage sludge as it is discharged from the sewage treatment plant and mixing it with red mud in a state containing organic matter, and large and small pores are formed in a large amount so that sufficient space for microorganisms is formed. It is possible to provide a method of manufacturing the same, which is described in detail in the registration publication, and an example in which wastewater was treated using such a porous sintered body 82 as a medium was filed in 2001 by the applicant of the present invention (Chungho Environmental Development Co., Ltd.). Patent application and registration in 2002 (Patent registration number 352749) "Sewage sludge porous sintered wastewater treatment device as a filter medium" in the aquatic plant water treatment tank having a predetermined width, length and depth sintering molding of sewage sludge as the main component Porous sintered body is filled with media and aquatic plants are planted in the upper layer. Examples convenient embodiment it can be seen the removal of organic matter efficiency and economic effects thereof.

At this time, it is necessary to install the filtrate water collecting hole 85 protruding to the upper portion of the filtrate water collection pipe 83 so that the filtrate water collecting pipe 83 can be inspected.

At this time, the organic matter remaining in the bed contains a large amount of nutrients such as nitrogen and phosphorus, so that it is decomposed and absorbed by the metabolic action of planted plants (especially reeds (81) and microorganisms in the bed) to be circulated to nature. In this case, the height of the organic matter supplied to the annual award should be kept within 12 mm (dry basis) in consideration of domestic climate conditions.

At this time, the reeds to be planted as plants 81 supply oxygen to the bed (porous sintered layer and residue layer of sediment), and when the height of the bed is increased, the reeds are rooted to the basement and the ground at the height of the organic material. It is the most suitable aquatic plant as artificial wetland plant for treatment.

In addition, when the artificial wetland 80 is formed, a puddle 86 is formed in several places of the image to increase the contact rate with the atmosphere so that the oxygen supply amount is increased, thereby improving the decomposition efficiency of organic matter by the microorganism and the plant 81. You can do it.

On the other hand, the artificial wetland 80 has a 50% organic matter content of the sediment flowing into the artificial wetland 80, and the height of the image rising during the year is fixed when the organic treatment capacity of the artificial wetland is fixed at 75% of the average 12mm per year. Since the standard is 15mm, the 60% water content will increase the height of the 37.5mm annually. If the clearance height of the artificial wetland is 150cm, the artificial wetland can be used for 40 years.

Therefore, this artificial wetland is a natural wetland when its use is completed, so that the natural treatment of subsurface sediment is realized, and when the height of the filter bed is increased by 15cm, the catchment with a diameter of 2m is piled into porous sintered body and natural stone at 3m interval. By promoting the drainage of the sediment, it can improve the drainage of organic wetlands or decompose organic matter and make long-term use possible.

Hereinafter, the embodiment of the hydrocyclone design that can obtain the most economical and excellent separation efficiency in consideration of the characteristics of the particles contained in the hydrocyclone used in the present invention, and the water sediment by the treatment system of the present invention Examples to demonstrate.

Example 1

1. Design of Hydrocyclone

(1) Both ports of the lower discharge port size

The sedimentary sediments were collected from five locations on Juam Lake (Gwangju, Chonnam), which is located in contact with Suncheon-si, Boseong-gun, and Hwasun-gun, Jeonnam.

In this case, the smaller the diameter of the hydrocyclone centrifuge is advantageous for the separation of particulate solid granules, such as the soil, but if the diameter is too small, the processing capacity per unit time is greatly lowered and the lower discharge port through which most soils flow out is blocked. In this laboratory, the diameter (D) = 40mm hydrocyclone was produced.

The specifications and experimental conditions of the hydrocyclone are as follows.

-Centrifugal length of hydraulic cyclone (L): 300. 500, 700mm

-Upper discharge port diameter (D ₁ ): 20mm

Lower discharge diameter (D ₂ ): 3,5,7mm

-Solid particle concentration in influent: 12% (weight ratio)

First, the experimental results were obtained by fixing the length of the cyclone (L) to 500 mm.

As can be seen in <Figure 1>, the solid discharge rate of the lower discharge port increased as the inlet pressure increased and the lower discharge diameter D ₂ decreased.

That is, at D ₂ = 6.0 mm, the solid discharge rate continued to increase as the inlet pressure was increased, but it increased to ₂ atm at D ₂ = 4.9 mm and showed a similar value at 3 atm, 78% at 1 atm at D ₂ = 4.0 mm. At 2.0 atm, clogging occurred, resulting in no separation at higher pressures.

From the above results, the size of D ₂ suitable for the particle size and specific gravity of the sample used in this experiment is 4.9mm and the inlet pressure is 1.0 ~ 2.0atm. Since the discharge rate of the throughput of 1atm 2.1m ³ a behind-the-scenes of the multi-hydro cyclone hereafter eight cyclone sediment in the pressure condition is about 16m ³ per hour to process the underwater sediments of 128m ³ / d when working 8 hours a day (12% solids).

The solid discharged through the hydraulic outlet of the hydraulic cyclone was 12.6t.

(2) Influence of centrifuge length of hydraulic cyclone

Next, the length of the cyclone centrifuge was changed to 300 and 700 mm, and the influence on the length separation of the centrifuge was analyzed (the diameter of the bottom discharge port was fixed at 5 mm).

In the present invention, the centrifugal separator is made of two cylinders, the outer cylinder and the inner cylinder, and the outer cylinder is fixed and the inner cylinder contained in the outer cylinder is moved downward to extend the length of the centrifugal separator to obtain a classification effect.

The experimental results are shown in <Figure 2>.

According to Figure 2, when the diameter of the hydrocyclone's centrifuge was 700 mm, the solid discharge from the bottom discharge increased slightly compared to 50 mm due to the increased recovery of swirl flow inside.

Overall, the outflow was increased at lower pressures than at higher pressures, and d ₅₀ was somewhat smaller.

The diameter = 300 mm showed a low overall solids flow rate.

When D = 700mm at 1atm of the influent, the solid flow rate was 79%, but 74% at D = 300mm, indicating that the separation rate of particulates was greatly affected by the length of the centrifuge.

These results were also observed at 2 atm and slightly increased at 3 atm. However, considering the power consumption of hydraulic cyclones, inlet pressures of about 1 atm are generally appropriate. In the hydrocyclone of D = 40 mm, the centrifuge length = 300,500, 700 mm L = 700mm is the most suitable standard for the sediment separation.

(3) Influence of particle concentration

Since the particle concentration of the subsurface sediment varies greatly depending on the place of sedimentation and the inhalation conditions of the sediment, it is necessary to conduct a separate experiment of cyclone according to the solid concentration.

The following is the result obtained by changing the solid concentration from 4 to 16% under the conditions of D ₁ = 20mm, D ₂ = 4.9mm and inlet pressure = 1atm.

As can be seen from Figure 3, at 4% solids, almost similar results were obtained regardless of the specifications of L (= centrifuge length), and similar results were obtained at L = 700 and 500 mm at 8% solids.

However, from 12% of solid concentration, the best separation effect was obtained at L = 700mm.

In the above results, when the solid concentration is low, shortening L brings about the effect of reducing power consumption and throughput. Therefore, the sediment sediment separation of the hydrocyclone changes the length of L to suit the solid concentration of the influent flowing into the multi-hydrocyclone. The present invention is to be able to adjust the length of the centrifuge by simply operating in the field work by allowing the inner cylinder installed in the outer cylinder to be extended and reduced by moving the inner cylinder down in the way to loosen and tighten the bend screw. It was.

Example 2

The top discharge (under 3% of the concentration of organic and particulate soils) discharged through the top discharge port of the hydrocyclone is transferred to the gravity settler by natural dropping or forced transfer, and the water level rises up to the inflow distribution plate of the gravity settler. The inflow was stopped and the sedimentation of the influent began, and the settling was completed about 4 hours later.

Thereafter, the initial height of the filtration layer consisting of the porous sintered body was formed to 70cm, and the reed was transferred to the artificial wetland planted with plants.

Organic matter contained in the sediment introduced into the artificial wetland is supplied to the decomposing action of the microorganisms inhabiting the porous sintered body and the nutrient material planted reeds, and a small amount of particulates becomes clear water as the adhesion action of the porous sintered body proceeds sufficiently. Was collected in the vacant space below the statue and finally discharged to the lake or river.

At this time, as a result of analyzing the water quality of the discharged water according to the time stayed in the artificial wetland, the measurements of Table 1 were obtained.

<Table 1> Natural Purification Results of Effluents by Sedimentation Time

Analysis item Influent Load (Unit mg / 1) Load of treated water by residence time (unit: mg / 1) 1 day 2 days 3 days 4 days 5 days 6 days BOD 258 45 29 14 8 4 3 COD 184 73 46 28 23 20 17 T-N 37 15 8 6 5 4 4 T-P 5 1.2 0.3 0.14 0.09 0.07 0.03 SS 159 12 9 8 4 4 3

According to Table 1, the BOD load of the initial influent was 258mg / 1, but it was continuously lowered over time, and after 5 days, it was lowered to less than 5mg / 1, and thus, about 98% of treatment efficiency was obtained. , COD (chemical oxygen demand) was gradually lowered from 184mg / 1 to 17mg / 1 after 6 days, and the treatment efficiency was about 91%, and TN (total nitrogen) was similar to BOD. In TP (total phosphorus) removal, the treatment efficiency of 76% after 1 day, 94% after 2 days, and 99% or more after 6 days can be obtained by the characteristics of porous sintered body. It was confirmed that an excellent effect can be obtained in the removal.

This is a result of the reduction of metal elements such as iron on the surface of the sintered body as the spherical grains made by mixing sewage sludge and red mud (ocher) were baked at about 1150 ° C. The reaction efficiency seems to have increased.

Therefore, if the BOD load is based on discharged water, it is 14mg / 1 in the 3-day stay period, so if you install the filter under the 3-day stay condition, if the depth is 70cm, you can install the 210m ² filter bed to treat the subsurface sediment.

Therefore, the present invention configured as described above is the centrifugal diameter of the hydrocyclone 40 used for the separation of the soil and organic matter contained in the water sediment to be treated has an optimum separation efficiency with optimum economic efficiency according to the particle distribution of the influent. It is not only in the form of a multicyclone to have a separation part, but also allows the length adjustment of the centrifugal separation part so that it is possible to obtain the soils contained in the water sediment economically and efficiently, so that it can be used as aggregate for construction materials or landfill of civil engineering works. On the other hand, by the physical treatment using the sedimentation device (60), by concentrating the organic matter, which is the main constituent of the subsurface sediment and separated from the supernatant water, there is no harm to nature, the separated organic material is porous sintered body (82 ) And plants planted in this porous sintered body (82) The eco-friendly process to remove by 81 will be enabled.

Therefore, the present invention can completely solve the problem that secondary pollutants are generated even after the conventional treatment by the natural wetland through physical treatment and artificial wetland, and the earth and sand, which is the main component of the water sediment, can be recycled as an important resource and the organic matter. Since it is consumed as a nutrient component of plants planted in artificial wetlands, it is economical and environmentally friendly treatment method than any treatment method.

Claims (4)

Separation device 10 for removing coarse material from the bottom water containing the bottom sediment, storage tank 20 for storing the selected coarse material, and storage tank 30 for storing the bottom water passing through the sorting device 10 ), And the water stored in the storage tank 30 is introduced into the state distributed through the central distribution tank (90) to the hydraulic power having a multi-cyclone form so as to separate into the upper discharge and the bottom discharge containing the soil containing organic matter Cyclone 40, a gravity type dewatering device 50 for obtaining soil from the bottom discharge, natural sedimentation device 60 for separation of sediments and supernatant concentrated with organic matter from the top discharge, and Ozone treatment device 70 for removing traces of contaminants contained in the supernatant water, and artificial wetland 80 in which porous sintered body 82 is used as a food medium of the bed and plant 81 for organic treatment included in the sediment. Is composed of Sunken deposit processing system of a. The hydraulic cyclone (40) according to claim 1, wherein the hydraulic cyclone (40) has a double cylindrical structure of an outer cylinder (44) and an inner cylinder (45) movable downward of the outer cylinder (44), and a plurality of discharge ports at the lower end of the lower discharge port (41). System for treating the sediment of the submerged water, characterized in that the adjustment plate fixing portion 47 is equipped with a diameter control plate 46 is formed. The system of claim 1, wherein the gravity sedimentation device (60) is provided with an inflow water distribution plate (61) inclined downward at an inclination angle of 15 degrees. The bottoms containing the sediment are removed to the top of the water system to separate the coarse through the sorting process, and the tops containing organics and the bottoms containing the soil are separated from the bottoms from which the coarse is removed. Centrifugal force separation step to achieve, gravity dehydration step to obtain only the soil from the bottom discharge to be used as aggregate resources, and natural sedimentation step for separation of sediments and supernatant concentrated with organic matter from the top discharge And, an ozone treatment step for removing trace amount of organic matter remaining in the separated supernatant, and an organic treatment step of introducing organic matter contained in the separated sediment into an artificial wetland formed by a porous sintered body as a media and plant material of plants. Treatment method of submerged sediment to do.