KR0140143Y1 - Water improvement apparatus - Google Patents

Water improvement apparatus Download PDF

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Publication number
KR0140143Y1
KR0140143Y1 KR2019960028427U KR19960028427U KR0140143Y1 KR 0140143 Y1 KR0140143 Y1 KR 0140143Y1 KR 2019960028427 U KR2019960028427 U KR 2019960028427U KR 19960028427 U KR19960028427 U KR 19960028427U KR 0140143 Y1 KR0140143 Y1 KR 0140143Y1
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South Korea
Prior art keywords
wind
water
impeller
frame
quality improvement
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KR2019960028427U
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Korean (ko)
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KR19980015213U (en
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김백기
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김백기
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
    • E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
    • E02B15/10—Devices for removing the material from the surface
    • E02B15/107—Whirling means forming a vortex in the water; cyclones
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wind Motors (AREA)

Abstract

실용원 95-10864호에서 바람을 동력으로 이용하여 저층의 물을 상층으로 상승 순환시켜 수질 개선을 유도하였으나 임펠러 회전이 일측에서만 되어 효율도 낮고 바람과 엇갈리게 배치되었다.In Practitioner 95-10864, the wind was used as a power source to improve the water quality by circulating the water in the lower layer to the upper layer, but the impeller was rotated on only one side, resulting in low efficiency and staggered with the wind.

본 고안은 베인휠 방식을 택하여 바람의 이용율을 높이며 동시에 임펠러를 회동하되 그 방향이 서로 베인휠 축의 양측에서 반대가 되게 하므로서 프레임 전체의 비틀림이 없이 바람을 향하여 수직으로 연속 회동토록 하였다.The present invention uses the vane wheel method to increase the wind utilization and at the same time rotate the impeller, but the direction is opposite to each other on both sides of the vane wheel axis, so that the vertical rotation to the wind without twisting the entire frame.

따라서 효율이 높아져 규모가 적게 되고 보다 다량의 저층수가 순환가능토록 하게 되었다.As a result, the efficiency has been reduced to a smaller scale, and a larger amount of low water can be circulated.

Description

무동력 저수지 수질개선 장치Non-powered reservoir water quality improvement device

본 고안은 저수지, 호수등과 같이 물이 저류되는 곳에서 각종 오폐수의 침투로 오염되는 경우 저수층와 상층수를 무동력 순환시켜 주므로 상하 순환에 의한 산소공급으로 유기물의 분해가 촉진되며 동시에 저온수가 상층에 솟구쳐 녹조·적조등 조류의 번성을 억제하므로서 자정 능력을 극대화한 무동력 저수지 수질개선장치에 관한 것이다.The present invention, when contaminated by the infiltration of various wastewater in the place where the water is stored, such as reservoir, lake, etc., circulates the reservoir and the upper water silently. The present invention relates to a non-powered reservoir water quality improvement device that maximizes the self-cleaning ability by suppressing the flourishing of algae such as green algae and red tide.

댐, 호수나 저수지등과 같이 물이 흐르지 못하고 저류되는 곳에서 오폐수가 침투되면 자정능력을 넘는 경우 녹조·적조류의 다량 발생으로 용존산소가 사라지면서 물자체가 썩게 되는 것이다. 최근 시화호 등의 오염현상도 이같은 경우로서 오폐수의 침투를 차단할 수 없는 관계로 오염도는 점점 심각해지고 있는 것이다. 이같은 문제를 개선하는 방법으로 오폐수를 정화시켜 방류하는 것이 가장 바람직하나 대부분의 공장이 이들 장치를 가동치 않고 무단 방류함에 해결이 어려운 것이다.If wastewater penetrates in a place where water does not flow, such as a dam, a lake, or a reservoir, if the water exceeds the midnight capacity, the dissolved oxygen disappears due to the generation of green algae and red algae, causing the material to rot. In recent years, the pollution phenomenon of Sihwa Lake, etc. is such a case that the pollution level is getting serious because the infiltration of wastewater cannot be blocked. It is most desirable to purify and discharge the wastewater as a way to ameliorate this problem, but most plants do not operate these devices and are difficult to solve without unauthorized discharge.

또다른 방법으로 댐, 호수 등의 자체 정화능력을 극대화시키는 것이다. 이같은 방법의 일환으로 본 고안자는 실용신안등록출원 95-10864호 저수지 수질 개선장치에서 저수지·댐등에서 항시 불어오는 바람을 동력원으로 이용하여 저층의 물을 상층으로 끌어올려 순환시키는 장치를 제공하고 있다. 이 고안은 특별한 동력이 필요없이 풍력을 이용하므로 일단 설치한다면 가장 경제적으로 수질정화를 영구히 가능케 한 것이다. 그러나 풍차날개의 회전력으로 수중의 임펠라를 구동시키는 경우 운동방향이 수직으로 교차되어 장치가 바람과 엇갈려 배치되어 회전날개의 구동이 약화되어지는 문제가 있었다.Another way is to maximize the self-purification capacity of dams and lakes. As a part of such a method, the present inventors provide a device for circulating the water of the lower floor by using wind from the reservoir or the dam as a power source in the utility model registration application No. 95-10864. This design uses wind power without the need for special power, so once installed it is the most economical solution for permanent water purification. However, in the case of driving the impeller underwater by the rotational force of the windmill blade, the direction of movement is vertically crossed, so that the device is intersected with the wind and the driving of the rotary blade is weakened.

본 고안은 동력을 발생하는 풍력 구동부를 축을 중심으로 익형(blade profile)이 프로펠러형과 같은 축류형이 아니고 베인휠(Vane wheal)형으로 하며 저층수를 끌어올리는 수단도 동력전환이 베인휠축 양단에서 동시에 서로 운동방향이 반대가 되도록 이루어져 바람의 방향과 빗나가는 현상을 없애주었다.The present invention does not use the axial flow type like the propeller type but the vane wheel type with the blade profile of the wind power generating part. The directions of movement are reversed so that the wind direction and the deflection are eliminated.

제1도는 본 고안의 수질개선 장치가 설치된 상태의 부분 절개 단면도.1 is a partial cutaway cross-sectional view of the water quality improvement device of the present invention is installed.

제2도는 본 고안의 수질개선 장치가 설치된 상태의 부분확대단면도.2 is a partially enlarged cross-sectional view of the water quality improvement apparatus of the present invention installed.

제3도는 본 고안의 부분 확대 평면도.3 is a partially enlarged plan view of the present invention.

제4도는 본 고안의 전체 평면도임.4 is an overall plan view of the present invention.

제5도는 본 고안의 또 다른 실시예를 나타낸 요부종단면도.Figure 5 is a longitudinal cross-sectional view showing another embodiment of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

가 : 프레임부 나 : 순환동력부A: Frame part B: Circulation power part

다 : 수유도부 1,2,3 : 부력체C: Feeding part 1,2,3: buoyant body

5 : 프레임 5',5 : 주축5: frame 5 ', 5: main axis

6,6' : 크로스멤버 10,10' : 보호하우징6,6 ': Cross member 10,10': Protective housing

11 : 피동축 12 : 축11: driven shaft 12: axis

4 : 수유도관 15 : 베인휠4: feeding pipe 15: vane wheel

16 : 거름막 17 : 수유입구16: manure screen 17: feeding inlet

20 : 임펠러20 impeller

본 고안은 부력체를 이용하여 물에 부유하는 프레임 풍력구동부를 설치하여 풍력을 이용하여 저수지 등의 저부에 연장된 도관으로부터 저층수를 상층으로 뽑아올려 순환케하는 풍력을 이용한 저수지 수질 개선장치에 있어서, 2 이상의 부력체(1)(2)(3)를 하부에 부착하여 수면에 부유하면서 순환동력부(나)와 수유도부(다)를 지지하는 프레임부(가)와, 상기한 프레임부(가)와 상면에서 양측의 동력변환부를 내장한 보호하우징(10)(10')에 의하여 축지지되어지되 축(12) 양측의 보호하우징(10)(10')의 베벨기어의 나사산 회전 방향이 반대로 구성한 순환동력부(나)와, 상기한 순환동력부(나)의 보호하우징(10) 하측에 돌출 연장된 피동축(11) 선단의 임펠러(20)를 상측 중앙에 내장하면서 댐 등의 저부까지 연장되는 탄성 구조의 수유도관(14)으로 구성되는 수유도부(다)로 구성되어 있다.The present invention is to install a frame wind power unit floating in the water using a buoyancy body in the reservoir water quality improvement apparatus using the wind power to circulate the bottom water from the conduit extended to the bottom such as the reservoir using the wind power to circulate, Frame part (a) which attaches two or more buoyancy bodies (1) (2) (3) to the lower part and floats on the surface, and supports the circulating power part (b) and the water induction part (c), and said frame part (a) ) And the rotating direction of the bevel gears of the bevel gears of the protective housings 10 and 10 'on both sides of the shaft 12 are oppositely supported by the protective housings 10 and 10' having the power converters on both sides thereof. The circulating power part (b) and the impeller 20 of the tip of the driven shaft (11) protruding and extending below the protective housing (10) of the circulating power part (b) described above are built in the upper center to the bottom of the dam or the like. Feeding portion consisting of a feeding tube 14 of the elastic structure extending ( ) It is composed of.

본 고안의 프레임부(가)는 절체 또는 목재나 합성수지재를 이용하여 주축(5')(5)상에 크로스멤버(6)(6')들을 결합하며 그 저부에 부력체(1)(2)(3)들을 고정설치한 것으로서 본 고안의 경우 사각면체로 구성하였으나 필요에 따라서는 5각 이상의 다각형태나 원형으로 하여도 무방하며, 부력체는 발포수지, 고무벌룬, 금속제 압력용기 등이 사용될 수 있다. 또한 프레임부상에 공기유도로(30)를 별도로 설치하여 진입되는 공기가 회전중인 임펠러(20)에 효과적인 집중이 되도록 할 수 있다. 상기 유도로의 최대 높이가 임펠러의 중심부와 같고 프레임부의 선단부로 갈수록 낮아지는 경사면을 갖는다.Frame part (a) of the present invention combines crossmembers (6) and (6 ') on the main shaft (5') (5) using cut or wood or synthetic resin material and buoyancy body (1) (2) at the bottom thereof. In the case of the present invention, the polygonal or circular shape may be used as the polygonal shape or the shape of the present invention, but the buoyancy body may be made of foamed resin, rubber balloon, metal pressure vessel, etc. Can be. In addition, by separately installing the air induction path 30 on the frame portion it is possible to effectively concentrate the air entering the impeller 20 is rotating. The maximum height of the guideway is the same as the center of the impeller and has an inclined surface that decreases toward the leading end of the frame portion.

본 고안의 순환동력부(나)는 양측 보호하우징(10)(10')의 베인휠(15)의 축(12)이 지지되어져 있으며, 축의 양단에 베벨기어(13)를 설치하여 운동방향을 90˚변환하며, 베벨기어 하측으로 피동축(11)이 연결토록 하되 이같은 동력전달 구조를 축(12) 양측에 베벨기어의 나사산 회전방향이 서로 반대방향으로 되도록 설치하였다.The circulating power unit (B) of the present invention is supported by the shaft 12 of the vane wheels 15 of both protective housings 10 and 10 ', and has a bevel gear 13 installed at both ends of the shaft to change the direction of movement. The 90 ° conversion was performed so that the driven shaft 11 was connected to the lower side of the bevel gear, but the power transmission structure was installed on both sides of the shaft 12 so that the thread rotation directions of the bevel gears were opposite to each other.

본 고안의 수유도부(다)는 길게 연장된 중공의 수유도관(13)의 하측부에 거름막(16)이 수유입구(17)를 걸러주도록 설치하며 상측부는 프레임과 연결하되 임펠러(12)와 프레임 사이에는 물배출구(18)가 형성되어져 있고 연결선(19)에 의하여 프레임과 그 하측이 연결토록 하였다. 물배출구(18)는 그 하측이 물속에 침수되어 있어 상승된 저층수가 수면위로 솟구치지 않고 측면으로 배출되도록 하였다.The feeding part (c) of the present invention is installed so that the filtering membrane 16 filters the feeding inlet 17 at the lower part of the hollow feeding conduit 13 which is elongated, and the upper part is connected to the frame, but the impeller 12 and A water outlet 18 is formed between the frames, and the connecting line 19 is connected to the frame and the lower side thereof. The water outlet 18 was submerged in the water so that the elevated bottom water was discharged to the side without rising above the water surface.

이같은 구성을 갖는 본 고안의 수질개선 장치의 작동관계는 다음과 같다.The operation relationship of the water quality improvement device of the present invention having such a configuration is as follows.

제1도에 도시하듯이 바람(w)이 불어오면 베인휠(15)이 반작용에 의하여 회전이 시작되며 축(12)이 회전되므로 베벨기어(13)도 회동하므로 피동축(11)과 연결된 임펠러(20)도 회전하며 물을 화살표(f)와 같이 흡입하는 것이다. 마찬가지로 타측의 보호하우징에 있는 것도 회동하되 그 베벨기어의 회전방향을 제2도와 같이 서로 반대방향으로 설치하였으므로 물을 저층에서 흡입하되 한쪽으로 쏠리는 현상이 없이 좌우 균형이 이루어지는 것이다. 충분히 가동후 연결선(19)을 수시로 당기어 하측의 거름막(16)을 청소하여 물의 흐름이 원활토록 한다.As shown in FIG. 1, when the wind w is blown, the vane wheel 15 starts to rotate by reaction and the shaft 12 is rotated so that the bevel gear 13 also rotates, so that the impeller connected to the driven shaft 11 is rotated. (20) also rotates to inhale water as shown by the arrow (f). Similarly, the protection housing on the other side is rotated, but since the bevel gears are rotated in opposite directions as shown in FIG. 2, water is sucked from the lower floor but left and right balanced without any phenomenon. After sufficient operation, the connection line 19 is pulled from time to time to clean the lower manure membrane 16 so that the water flows smoothly.

본 고안은 저수지 등의 심층수를 표층으로 순환시키되 자연의 풍력을 동력으로 이용하므로 설치가 완료된 후 특별한 보수가 필요없다.The present invention circulates deep water, such as reservoirs, to the surface, but uses natural wind power as power, so no special maintenance is required after installation is complete.

더 나아가서 물을 뽑아올리는 임펠러(20)의 회동을 축(12)양측에서 서로 반대되게 하여 주므로서 종래 일측에서만 회동시 바람 방향과 수직으로 설치되지 못하고 엇갈리게 되어 작동이 나쁘던 점을 해소한 것이다.Furthermore, the rotation of the impeller 20 to pull out water is reversed from each other on both sides of the shaft 12, so that only one side of the conventional rotation is not installed perpendicular to the wind direction and is staggered to solve the bad operation.

Claims (4)

부력체를 이용하여 물에 부유하는 프레임 상부에 풍력구동부를 설치하고 저부에 연장된 도관으로부터 저층수를 상층으로 흡입하도록 풍력구동부의 임펠러가 연결된 풍력을 이용한 저수지 수질개선 장치에 있어서, 2 이상의 부력체(1)(2)(3)를 하부에 부착하여 수면에 부유하면서 순환동력부(나)와 수유도부(다)를 지지하는 프레임부(가)와, 상기한 프레임부(가)와 상면에서 양측의 동력변환부를 내장한 보호하우징(10)(10')에 의하여 축지지되어지되 축(12) 양측의 보호하우징(10)(10')의 베벨기어의 나사산 회전 방향이 반대로 구성한 순환동력부(나)와, 상기한 순환동력부(나)의 보호하우징(10) 하측에 돌출 연장된 피동축(11) 선단의 임펠러(20)를 상측 중앙에 내장하면서 물속 저부까지 연장되는 탄성 구조의 수유도관(14)으로 구성되는 수유도부(다)로 구성되는 것을 특징으로 하는 풍력을 이용한 저수지 수질개선 장치.In the reservoir water quality improvement apparatus using wind power connected to the impeller of the wind driving unit to install the wind driving unit on the upper part of the frame floating in the water by using the buoyancy body and suction the low water from the conduit extending to the bottom. 1) (2) and (3) are attached to the lower part to float on the surface of the water while supporting the circulating power part (b) and the feeding part (c) (a), and the frame part (a) and both sides on the upper surface. The circulating power unit is supported by the protective housing (10) (10 ') having a built-in power converter of the rotational direction of the bevel gear of the protective housing (10, 10') on both sides of the shaft (12) oppositely. B) and an elastic feeding conduit extending to the bottom of the water while embedding the impeller 20 at the tip of the driven shaft 11 protruding and extending below the protective housing 10 of the circulating power unit (b). Consists of a water induction part (C) consisting of (14) Reservoir water quality improvement device characterized in that the wind power. 제1항에 있어서, 순환동력부(나)는 보호하우징(10)(10')에 베인휠(15)의 축(12)이 지지되어져 있으며, 축의 양단에 베벨기어(13)를 설치하여 운동방향을 90˚변환시켜 피동축(11)이 회동하도록 하되, 베벨기어의 나사산 방향이 양측이 서로 반대가 되도록 설치하는 것을 특징으로 하는 풍력을 이용한 저수지 수질개선 장치.2. The circulating power unit (B) has a shaft (12) of the vane wheel (15) supported by the protective housing (10) and (10 '), and the bevel gears (13) are provided at both ends of the shaft for movement. Reservoir water quality improvement apparatus using wind power, characterized in that the driven shaft 11 is rotated by changing the direction by 90 degrees, so that the threaded direction of the bevel gear is opposite to each other. 제1항에 있어서, 수유도부(다)는 길게 연장된 중공의 수유도관(13)의 하측부에 거름막(16)이 수유입구(17)를 걸러주도록 설치하며, 상측부는 프레임과 연결하되 임펠러(12)와 프레임 사이에는 공기 배출구(18)가 형성되어져 있고 연결선(19)에 의하여 프레임과 그 하측이 연결되는 것을 특징으로 하는 풍력을 이용한 저수지 수질개선 장치.According to claim 1, wherein the feeding portion (c) is installed in the lower portion of the elongated hollow feeding conduit 13 to filter the feeding inlet 17, the upper portion is connected to the frame impeller An air outlet 18 is formed between the frame 12 and the frame, and the water quality improvement apparatus using wind power, characterized in that the frame and its lower side are connected by a connecting line 19. 제1항에 있어서, 프레임부의 상부에 공기유도로(30)를 별도로 설치하여 진입되는 공기가 회전중인 임펠러(20)에 효과적인 집중이 되도록 유도로(30)의 최대 높이가 임펠러부의 중심보다 낮게 구비되며, 선단부로 갈수록 낮아지는 경사면을 구비한 것을 특징으로 하는 풍력을 이용한 저수지 수질개선 장치.According to claim 1, wherein the air induction path 30 is installed separately in the upper portion of the air inlet 30 is provided with a maximum height of the induction path 30 is lower than the center of the impeller portion in order to effectively concentrate on the rotating impeller 20 Reservoir water quality improvement device using the wind, characterized in that having a slope that is lowered toward the tip.
KR2019960028427U 1996-09-06 1996-09-06 Water improvement apparatus KR0140143Y1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100352190B1 (en) * 1999-09-13 2002-09-12 백 기 김 Apparatus for improving water quality of reservoir
KR100380185B1 (en) * 2000-07-20 2003-04-14 소용호 Fan-driven oxygen supply system for water improvement
KR100387203B1 (en) * 2000-02-09 2003-06-18 주식회사 삼경기술용역단 The quality of water puritication equipment for dam and reservoir
KR101371263B1 (en) * 2013-08-28 2014-03-07 (주)에코원 Double spin water circulation system for water puryfication and preventing green algae and red tide occurrence
KR101371328B1 (en) * 2013-08-28 2014-03-10 (주)에코원 Double spin water circulation system having underwater floor water circulation means
KR102011983B1 (en) * 2018-04-12 2019-08-19 알에스티이엔씨 주식회사 Lake-purification system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100436206B1 (en) * 2000-11-06 2004-06-16 백 기 김 Method of improving water quality of a resevoir
KR101312605B1 (en) * 2012-02-22 2013-09-30 주식회사 다우해양 An Hybrid Aeration System

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100352190B1 (en) * 1999-09-13 2002-09-12 백 기 김 Apparatus for improving water quality of reservoir
KR100387203B1 (en) * 2000-02-09 2003-06-18 주식회사 삼경기술용역단 The quality of water puritication equipment for dam and reservoir
KR100380185B1 (en) * 2000-07-20 2003-04-14 소용호 Fan-driven oxygen supply system for water improvement
KR101371263B1 (en) * 2013-08-28 2014-03-07 (주)에코원 Double spin water circulation system for water puryfication and preventing green algae and red tide occurrence
KR101371328B1 (en) * 2013-08-28 2014-03-10 (주)에코원 Double spin water circulation system having underwater floor water circulation means
KR102011983B1 (en) * 2018-04-12 2019-08-19 알에스티이엔씨 주식회사 Lake-purification system

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