JP2006068624A - Method for improving water quality - Google Patents

Method for improving water quality Download PDF

Info

Publication number
JP2006068624A
JP2006068624A JP2004254245A JP2004254245A JP2006068624A JP 2006068624 A JP2006068624 A JP 2006068624A JP 2004254245 A JP2004254245 A JP 2004254245A JP 2004254245 A JP2004254245 A JP 2004254245A JP 2006068624 A JP2006068624 A JP 2006068624A
Authority
JP
Japan
Prior art keywords
water
area
floc
filter
circulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2004254245A
Other languages
Japanese (ja)
Other versions
JP3964415B2 (en
Inventor
Takashi Masui
▲隆▼ 桝井
Original Assignee
Takashi Masui
▲隆▼ 桝井
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Takashi Masui, ▲隆▼ 桝井 filed Critical Takashi Masui
Priority to JP2004254245A priority Critical patent/JP3964415B2/en
Publication of JP2006068624A publication Critical patent/JP2006068624A/en
Application granted granted Critical
Publication of JP3964415B2 publication Critical patent/JP3964415B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently clean a water region to be treated such as a lake, a marsh, a pond, a river, a waterway and a closed live-box as a whole by cleaning the water of the water region and removing precipitates to be accumulated at the bottom of the water region. <P>SOLUTION: A circulating water current going around the water region 11 to be treated is generated. A precipitable flocculant is thrown into the water region 11 so that impurities in the water region are flocculated and formed into flocks 12. The formed flocks are filtered/gathered by a filter 13 erected from the bottom of the water region to the water surface. The gathered flocks are sucked together with water, filtered in a filtration tank 14 and recovered. The filtrate obtained by filtration is returned to the water region. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for improving water quality in a water area such as a lake pond, a sacrifice or an aquarium.

  Water and eutrophication may occur in lakes and ponds due to rainwater containing domestic wastewater and fertilizer, organic matter such as fallen leaves and dead animals, and accumulation of living organisms' waste. . The same can happen in turbulent rivers and waterways, and even in places that are managed by humans, such as fish cages and aquariums used for aquaculture, ponds for aquatic life in elementary schools, Eutrophication may be promoted depending on the wastes such as the cages that are kept and the feed that is introduced.

  As eutrophication progresses, conditions such as sunlight and temperature overlap, and microalgae such as blue-green algae and other plankton are abnormally generated, and a vicious cycle may occur in which the carcasses decay and decompose to further eutrophicate water. If the contamination progresses in this way, not only the water quality deteriorates due to sludge, but also a bad odor is generated, so it is necessary to purify these contaminants.

  As a purification method, an artificial flow is generated in the lake pond, flocculant is mixed there, and flocs generated by the reaction between the pollutant and the flocculant are floated by fine bubbles to form an oil fence. Patent Document 1 describes a method of collecting on the water surface with an object.

  In addition, there is a patent for a method of purifying water by adding flocculant to mud pumped up from the water area and returning it directly to the water area, or adding flocculant directly and depositing the agglomerated treated soil on the bottom of the water. It is described in Document 2.

JP-A-6-226249 JP 2003-181465 A

However, in the method described in Patent Document 1, the high specific gravity pollutant that does not float cannot be recovered and remains in the bottom of the water, suspended in water for a long time, and the purification treatment time becomes long. In some cases, purification was incomplete. In addition, the floating flock sometimes caused difficulty in breathing in the gills of fish living in the water.
Furthermore, in the method of Patent Document 2, water quality can be purified, but instead of generating industrial waste, treated soil accumulates on the bottom of the water, so that the entire water area cannot be completely purified. It was.

  Therefore, the present invention purifies the entire water area by purifying the water quality in the water area to be purified, such as lakes, swamps, ponds, rivers, waterways, sacrifices or aquariums, and removing the sediment accumulated in the bottom of the water. For the purpose.

  This invention generates a circulating water flow that circulates in the water area to be purified, and injects a sedimentary coagulant into the water area to agglomerate impurities in the water area to form a flock, so that the circulating water stream passes through the water bottom. A filter that rises from the water surface to the water surface is filtered and collected by the filter, and the floc is sucked up with water and filtered through a filtration tank to collect the floc and return the filtered water to the water area. The problem was solved.

  In this invention, since the floc is filtered and collected by the filter rising from the water bottom to the water surface, impurities can be collected in a short time from the water surface to the water bottom all at once without depending on the specific gravity of the generated floc. In addition, while collecting floc collected with water and returning filtered water to the water area, it is not necessary to reduce the amount of water in the water area so much and the work can be completed in a short time, so fish that inhabit the water area, etc. The purification work can be carried out while suppressing the influence on the water.

  Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 2 showing an embodiment. FIG. 1 is an example of a schematic view overlooking the water area 11 to be purified, and FIG. 2 is an example of a cross-sectional view of the water area 11. Moreover, the arrow in these figures shows the flow of water.

  The present invention generates a circulating water flow that circulates in the water area 11 to be purified, and injects a sedimentary flocculant into the water area 11 to agglomerate impurities in the water area 11 to form a floc 12. A filter 13 that rises from the bottom to the surface of the water is provided so that the circulating water flow passes through at least one place. The filter 13 filters and collects the flocs 12 and sucks the filtered flocs 12 together with water from the bottom. In the water quality improvement method for the target water area, the floc 12 is filtered by the filtration tank 14 and the filtered water is returned to the water area 11.

  In FIG. 1, the water area 11 to be purified by the present invention shows a pond in FIG. 1. However, the water area 11 is not limited to this, and is originally separated from a lake, a swamp, a box-shaped closed cage and a water tank. In addition to water areas, it also includes water areas that temporarily divide a part of open water areas such as seas, rivers, and waterways. Further, in the case of a lake, a swamp, a pond, etc., the present invention may be carried out by temporarily dividing a part thereof.

  The circulating water flow needs to circulate around the entire water area 11 that is the subject of the purification treatment. This is because the sedimentary flocculant is spread over the entire water area by the circulating water flow and the flocs generated in the entire water area are collected. As a method for generating this circulating water flow, for example, a method of inserting a stirring blade into the water area and rotating it, or a plurality of circulation pumps at a plurality of locations on the bottom of the water as shown in FIGS. 15 or a screw for circulation is installed in the direction in which the generated water flow circulates, and these are operated simultaneously. The method using the stirring blade is effective when the size of the water area 11 is such that the circulating water flow that circulates the entire water area with one stirring blade can be generated. In addition, a method of installing a plurality of circulation pumps 15 and the like can be used regardless of the size of the water area 11, but the water area 11 cannot sufficiently generate a circulating water flow by the method using the stirring blade. Especially effective when large.

  When the circulating water flow is generated, in addition to the above method, water is sucked up by a suction pump 16 provided with a suction port 16a at a predetermined water depth in the water area, and this water has a water depth different from the predetermined water depth. It is preferable to perform an operation of injecting along the flow direction of the circulating water flow from the discharge port 16b provided in the above. This is because the water in the water area can be mixed not only in the horizontal direction but also in the vertical direction, and the sedimentary flocculant described below can be distributed evenly throughout the water area. Here, when the predetermined water depth is close to the water surface, the different water depths are close to the water bottom, and when the predetermined water depth is close to the water bottom, when the different water depths are close to the water surface, the vertical direction of the water area The effect of stirring water is further increased.

  The sedimentary flocculant thrown into the water area 11 is an agent that can form floc 12 by aggregating impurities such as sludge, sludge, algae, and suspension suspended in water or deposited on the bottom of the water. Say. In addition, a floc means the flocculent flocculent lump. As the sedimentary flocculant, it is preferable to use an inorganic sedimentary flocculant because the possibility of deterioration of the water quality by itself is less than when an organic sedimentary flocculant is used. Among these, use of calcium sulfate as an active ingredient is more preferable because aggregation can be performed quickly.

By introducing the sedimentary flocculant into the water area 11 where the circulating water flow is generated, the sedimentary flocculant can be diffused throughout the water area 11 and the impurities in the entire water area can be aggregated as flocs 12. . The amount to be added varies depending on the size of the water area and the degree of contamination. For example, 100 to 150 g of a sedimentary flocculant containing calcium sulfate as a main component is added per 1 m 3 of raw water generated by the blue sea bream and stirred for 30 minutes. It has been found that the treatment yields highly transparent water suitable for aquatic breeding. If added in excess of 150 g / 1 m 3 , if organisms such as fish live in the water area, there is a risk of harming the health of those organisms. On the other hand, if it is less than 100 g / 1 m 3 , aggregation tends to be incomplete.

  Moreover, it is preferable to stir the water up and down from the bottom to the water surface by inserting a stirrer 17 in order to spread the settling flocculant over the entire water area and to make the impurities in the entire water area into the floc 12. It is particularly effective to perform such agitation when the water area is vast and the agitation in the vertical direction does not proceed with only the circulating water flow. When the water area is even larger, it is more preferable to insert a plurality of stirrers at various locations in the water area so that the entire layer is stirred from the water surface to the bottom of the water. Examples of such a stirrer 17 include a propeller type stirrer as shown in FIG. 1 and an aeration stirrer by injecting air. However, when fish and the like live in the water area, if such agitation is performed, the flock 12 that has floated due to the agitation may clog the fish gills and cause difficulty in breathing. Therefore, the agitation is preferably performed in the water area where fish and the like do not live. In the water area where fish and the like live, it is preferable to stir only with the circulating water flow.

  Next, the filter 13 used for filtering and collecting the flocs 12 generated as described above will be described. The filter 13 is a filter medium having a height that rises from the bottom of the water to the surface of the water, including a filtration part made of a net or fiber that transmits water and does not allow the floc 12 to permeate so that the floc 12 can be filtered and collected. By providing the filter 13 so that the circulating water flow passes, not only the floc 12 accumulated in the bottom of the water but also the impurities floating without being aggregated can be collected.

  The filter 13 may be provided in the water area 11 in advance, or may be provided after the floc 12 is generated and settled. If it is provided in the water area 11 in advance, the settling flocculant is added to generate the floc 12 and the floc 12 can be filtered and collected, so that the operation can be proceeded quickly.

  In addition, after the floc 12 is generated, the circulating water flow is temporarily stopped, the floc 12 is settled on the bottom of the water, the filter 13 is provided, and then the circulating water flow is regenerated, If the floc 12 is filtered and collected, the impurities can be thoroughly flocculated, and the generated floc can be filtered and collected more efficiently. In addition, if the force of the circulating water flow to be regenerated is made gentler than before the temporary stop, the flocs that have settled into larger lumps are difficult to diffuse and are easy to collect.

  The number of installed filters 13 is at least one, and a plurality may be provided according to the size of the water area. When the filter 13 is provided at the outer edge of the water stream where the flow of the circulating water flow is clear, the amount of water passing therethrough is larger than that provided near the loose center of the circulating water flow. Easy to collect. The filter 13 needs to have a width that allows at least the floc 12 to be filtered and collected.

  The structure of the filter 13 may be flat or may have a curved surface. Moreover, not only one sheet but also a plurality of sheets may be used together. The filter surface may be orthogonal to the water flow or may be inclined in the horizontal or vertical direction so that the flocks 12 can be collected while escaping the water flow.

  The floc 12 filtered and collected by the filter 13 is sucked up from the bottom with water. For example, as shown in FIG. 1 and FIG. 2, the suction can be efficiently sucked by arranging the suction port 16 a connected to the suction pump 16 at the location where the flocks 12 are gathered. The sucked flock 12 is sent to the filtration tank 14 together with water, and separated from the filtered water by the filtration tank 14 and collected.

  Note that a part of the floc 12 may be scooped up on the surface of the filter 13 and collected before the filtered floc 12 is sucked up by the suction pump 16. This method is used when the filter 13 is clogged due to a large amount of the floc 12 or when it takes too much time to take out from the water area 11 just by sucking up with the suction pump 16 and filtering through the filter tank 14. It is valid.

  The said filtration tank 14 consists of the filtration apparatus 18 which isolate | separates the floc 12 introduce | transduced with water with water with the filtration membrane 18a. The filtration tank 14 needs to be provided with at least one stage of the filtration device 18, and it is more preferable that the filtration tank 14 is provided with a plurality of stages because the purification is thoroughly performed. In the case of the multi-stage filter device 18, it is more preferable that the filter membrane 18a used in each filter device 18 is finer as the filter membrane 18a used in the downstream stage. Further, as shown in FIG. 3, when the flock discharge port 18b is provided in the lower part of the tank, the filtration device 18 can efficiently discharge the flock 12 accumulated in the device from the filtration device 18. It becomes easy to operate when there is a large amount of 12.

  Furthermore, the filtration tank 14 employs not only the filtration device 18 using the filtration membrane 18a, but also an activated carbon filtration device 19 that adsorbs fine dirt and odor by the activated carbon 19b to purify water as shown in FIG. Then, since the filtration of the said floc 12 is thorough, it is preferable. In this case, it is preferable that the activated carbon filtration device 19 is provided so as to treat the water that has passed through the filtration device 18 in a plurality of stages.

  The filtered water separated from the floc 12 in the filtration tank 14 needs to be returned to the water area 11. The water is sucked together with the flock 12 by the water suction pump 16 and the filtered water is returned to the water area 11 from the discharge port 19a, so that the water level of the water area 11 is maintained as necessary, and fish living in the water area 11 are saved. You can continue working without having to do so. In addition, here, when the filtered water is returned to the water area 11, if the tip of the discharge port 19a is above the water surface and is dropped into the water area so as to entrain air, the water in the water area can be aerated. More preferred.

  In addition, the water quality improvement method according to the present invention can further improve the water quality of the water area to be treated by repeating a plurality of times with a date rather than trying to remove all the impurities in one operation.

In a pond with a capacity of 36 tons with a depth of 50 cm, where water bottoms have disappeared due to the occurrence of blue sea urchin, a circulating water flow is generated, and a sedimentary flocculant mainly composed of calcium sulfate (manufactured by Nildo Plant Co., Ltd .: SCW- 1) 4320 g (120 g per m 3 ) was added and allowed to diffuse by circulating water flow for 15 minutes. After the circulating water flow was stopped and allowed to stand for 15 minutes, a filter (manufactured by Zensui Co., Ltd .; fiber water filter material, plate shape: thickness 30 mm) was provided to regenerate the circulating water flow and collect the generated floc It was. The collected flocs are sent to a filtration tank by a suction pump, and the flocs are separated by a filtration apparatus using a filtration membrane (same as a filter) in a filtration tank (manufactured by Suiko Container Co., Ltd .: SK-1500, capacity 1500 liters). When the process of returning filtered water to the pond was performed for 1 hour, the water in the pond became a transparency close to tap water, and it was possible to see to the bottom of the water.
Also, these tasks could be performed without saving the living turtles.

The bird's-eye view of the embodiment which implements the purification method concerning this invention Sectional drawing of the embodiment which implements the purification method concerning this invention Enlarged view of the filtration tank

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Water area 12 Flock 13 Filter 14 Filter tank 15 Circulation pump 16 Suction pump 16a Suction port 16b Discharge port 17 Stirrer 18 Filter device 18a Filtration membrane 18b Flock discharge port 19 Activated carbon filter device 19a Discharge port 19b Activated carbon

Claims (5)

  1. Generate a circulating water stream that circulates in the water area that is the target of purification treatment,
    Put a sedimentary flocculant into the water area to agglomerate impurities in the water area to form a floc,
    A filter that rises from the bottom of the water to the surface of the water so that the circulating water flow passes through at least one location in the water area.
    The water quality improvement method of the target water area which sucks up the said floc with water, filters with a filtration tank, collects the said floc, and returns filtered water to the said water area.
  2.   2. The circulating water flow is temporarily stopped to allow the floc to settle to the bottom of the water, and then the filter is provided, and then the circulating water flow is regenerated to filter and collect the floc. Water quality improvement method.
  3.   When generating the circulating water flow, water is sucked up at a predetermined depth, and the water in the water area is agitated by jetting the water at a depth different from the predetermined depth along the flow direction of the circulating water flow. The method for improving water quality according to claim 1 or 2, further comprising a step.
  4.   The water quality improvement method according to claim 1, wherein the filtration tank has an activated carbon filtration device.
  5.   The water quality improvement method according to any one of claims 1 to 4, wherein the sedimentary flocculant contains calcium sulfate as an active ingredient.
JP2004254245A 2004-09-01 2004-09-01 Water quality improvement method Expired - Fee Related JP3964415B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004254245A JP3964415B2 (en) 2004-09-01 2004-09-01 Water quality improvement method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004254245A JP3964415B2 (en) 2004-09-01 2004-09-01 Water quality improvement method

Publications (2)

Publication Number Publication Date
JP2006068624A true JP2006068624A (en) 2006-03-16
JP3964415B2 JP3964415B2 (en) 2007-08-22

Family

ID=36149778

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004254245A Expired - Fee Related JP3964415B2 (en) 2004-09-01 2004-09-01 Water quality improvement method

Country Status (1)

Country Link
JP (1) JP3964415B2 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100889497B1 (en) 2007-09-13 2009-03-19 박주형 Recirculating fish culture system including water circulating tank
AU2007203016B2 (en) * 2006-11-21 2009-04-23 Crystal Lagoons (Curacao) B.V. Process to obtain water bodies larger than 15,000 M3 for recreational use with color, transparency and cleanness characteristics similar to swimming pools or tropical seas at low cost
CN104255597A (en) * 2014-09-15 2015-01-07 中国水产科学研究院黄海水产研究所 Flounder and flatfish engineering pond recirculating aquaculture system
CN104255609A (en) * 2014-09-26 2015-01-07 武汉中科水生环境工程股份有限公司 Aquatic ecological breeding system
KR101488262B1 (en) * 2013-10-10 2015-01-30 권태근 The anti-green algae system for big four rivers
US9051193B2 (en) 2011-03-30 2015-06-09 Crystal Lagoons (Curacao) B.V. System for treating water used for industrial process
US9062471B2 (en) 2011-03-30 2015-06-23 Crystal Lagoons (Curacao) B.V. Sustainable system for treating water bodies affected by bacteria and microalgae at low cost
US9080342B2 (en) 2008-12-24 2015-07-14 Crystal Lagoons (Curacao) B.V. Suctioning device for travelling a tank bottom
US9120689B2 (en) 2011-03-30 2015-09-01 Crystal Lagoons (Curacao) B.V. System for providing high microbiological quality cooling water to an industrial processes
CN105746393A (en) * 2016-03-01 2016-07-13 上海海洋大学 Circulating water runway type shrimp aquaculture system and circulating water runway type shrimp aquaculture method
US9470008B2 (en) 2013-12-12 2016-10-18 Crystal Lagoons (Curacao) B.V. System and method for maintaining water quality in large water bodies
US9920498B2 (en) 2013-11-05 2018-03-20 Crystal Lagoons (Curacao) B.V. Floating lake system and methods of treating water within a floating lake
US9957693B2 (en) 2014-11-12 2018-05-01 Crystal Lagoons (Curacao) B.V. Suctioning device for large artificial water bodies

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8790518B2 (en) 2006-11-21 2014-07-29 Crystal Lagoons (Curacao) B.V. Process to maintain large clean recreational water bodies
AU2007203016B2 (en) * 2006-11-21 2009-04-23 Crystal Lagoons (Curacao) B.V. Process to obtain water bodies larger than 15,000 M3 for recreational use with color, transparency and cleanness characteristics similar to swimming pools or tropical seas at low cost
US7820055B2 (en) 2006-11-21 2010-10-26 Crystal Lagoons Corporation Llc Process to maintain large clean recreational water bodies
KR101015449B1 (en) * 2006-11-21 2011-02-18 크리스탈 라군스 코포레이션 엘엘씨 Process to obtainimplement and maintain water bodies larger than 15,000 cubic meters for recreational use with color, transparency and cleanness characteristics similar to swimming pools or tropical seas at low cost
US8062514B2 (en) 2006-11-21 2011-11-22 Crystal Lagoons Corporation, LLC Structure to contain a large water body of at least 15,000 m3
US8070942B2 (en) 2006-11-21 2011-12-06 Crystal Lagoons Corporation Llc Suction device for cleaning a bottom surface of a structure of at least 15,000 m3
US9708822B2 (en) 2006-11-21 2017-07-18 Crystal Lagoons (Curacao) B.V. Process to maintain large clean recreational bodies of water
KR100889497B1 (en) 2007-09-13 2009-03-19 박주형 Recirculating fish culture system including water circulating tank
US9080342B2 (en) 2008-12-24 2015-07-14 Crystal Lagoons (Curacao) B.V. Suctioning device for travelling a tank bottom
US9470007B2 (en) 2008-12-24 2016-10-18 Crystal Lagoons (Curacao) B.V. Efficient filtration process of water in a tank for recreational and ornamental uses, where the filtration is performed over a small volume of water and not over the totality of the water from the tank
US9120689B2 (en) 2011-03-30 2015-09-01 Crystal Lagoons (Curacao) B.V. System for providing high microbiological quality cooling water to an industrial processes
US9051193B2 (en) 2011-03-30 2015-06-09 Crystal Lagoons (Curacao) B.V. System for treating water used for industrial process
US9062471B2 (en) 2011-03-30 2015-06-23 Crystal Lagoons (Curacao) B.V. Sustainable system for treating water bodies affected by bacteria and microalgae at low cost
KR101488262B1 (en) * 2013-10-10 2015-01-30 권태근 The anti-green algae system for big four rivers
US10017908B2 (en) 2013-11-05 2018-07-10 Crystal Lagoons (Curacao) B.V. Floating lake system and methods of treating water within a floating lake
US9920498B2 (en) 2013-11-05 2018-03-20 Crystal Lagoons (Curacao) B.V. Floating lake system and methods of treating water within a floating lake
US9470008B2 (en) 2013-12-12 2016-10-18 Crystal Lagoons (Curacao) B.V. System and method for maintaining water quality in large water bodies
US10364585B2 (en) 2013-12-12 2019-07-30 Crystal Lagoons (Curacao) B.V. System and method for maintaining water quality in large water bodies
CN104255597A (en) * 2014-09-15 2015-01-07 中国水产科学研究院黄海水产研究所 Flounder and flatfish engineering pond recirculating aquaculture system
CN104255609A (en) * 2014-09-26 2015-01-07 武汉中科水生环境工程股份有限公司 Aquatic ecological breeding system
US9957693B2 (en) 2014-11-12 2018-05-01 Crystal Lagoons (Curacao) B.V. Suctioning device for large artificial water bodies
CN105746393A (en) * 2016-03-01 2016-07-13 上海海洋大学 Circulating water runway type shrimp aquaculture system and circulating water runway type shrimp aquaculture method

Also Published As

Publication number Publication date
JP3964415B2 (en) 2007-08-22

Similar Documents

Publication Publication Date Title
Cripps et al. Solids management and removal for intensive land-based aquaculture production systems
US7553418B2 (en) Method for water filtration
US3155609A (en) Stabilization of a closed or open water system through the selective utilization of light
US7332082B2 (en) System and method for biological purification of water
JP2007508813A (en) Autotrophic sulfur denitrification chamber and calcium reactor
JP3659591B2 (en) Sewage purification equipment
CN104445834B (en) A kind of prawn culturing waste water circulation purified water processing method
Ebeling et al. Performance evaluation of an inclined belt filter using coagulation/flocculation aids for the removal of suspended solids and phosphorus from microscreen backwash effluent
CN1262490C (en) Reverse osmosis method for treating sewage
EA030884B1 (en) System for treatment of water to be used for industrial purposes
KR101395188B1 (en) Wastewater disposal apparatus having membrane module and method thereof
KR101679047B1 (en) An Algae Removing Device
KR20110136222A (en) Ecological sewage water treatment system
JPH0899092A (en) Waste water treatment apparatus and method
EP0743925A1 (en) Novel compositions and methods for water treatment
JP2005111343A (en) Filtration unit, installation method for filtration unit and filtration apparatus
CN203319807U (en) Water treatment system for fish and shrimp farming
EP0404782A1 (en) Process for culture of aquatic animals.
KR101221579B1 (en) Apparatus for removing water-bloom and red tide mounted to ship
CN205648738U (en) All receive and be close to ecological industrialization farming systems of shrimp
JPH09323004A (en) Water treating apparatus
EA025761B1 (en) Efficient process for water filtration using ultrasound and performing the filtration over only a small volume of water of the totality of the water
CN105145455B (en) Industrial circulating water is breeded fish water treatment system
KR101322610B1 (en) Biological filtration system for water treatment
KR20170030682A (en) Aquaculture tank with biofloc and system and method using the same

Legal Events

Date Code Title Description
TRDD Decision of grant or rejection written
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070511

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070515

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070523

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100601

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110601

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120601

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120601

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130601

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees