JP2004276011A - Floating island type water cleaning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floating island type water cleaning apparatus capable of efficiently performing sludge treatment as the secondary discrepancy in a marshy type water cleaning apparatus and, at the same time, performing a dredging operation by sucking sludge, or the like, accumulated on the bottom part of rivers, lakes and marshes, and the like. <P>SOLUTION: This water cleaning apparatus 1 is provided with a tank body 2 which is floated on the water surface and discharges water 3 taken into an inflow port 2a from a discharge port 2b, a cleaning member 4 which is disposed in the tank body 2 and cleans the water 3 taken into the inflow port 2a side while the water 3 is discharged from the discharge port 2b, a float 5 giving bouyancy to the tank body 2 and a feed water means 6 which feeds the water 3 to the inflow port 2a. A meandering path 17 is formed in the tank body 2 and contaminated water is cleaned by repeating horizontal permeation and vertical permeation during the water flow. Therein, a sludge storage part 19 is disposed by making one part of the inside of the tank body 2 a double bottom structure. Further, a sludge discharge pipe 20 is faced to the sludge storage part 19 beforehand and the sludge accumulated in the sludge storage part 19 is discharged to the outside by a negative pressure suction force, or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a so-called wetland-type water purification treatment apparatus that purifies water of rivers, lakes, and the like using an artificial wetland (wetland). The processing can be performed efficiently. In addition, the present invention is particularly adapted to be used floating on rivers, lakes and marshes, etc., while purifying the water of these rivers, lakes and marshes taken in by water supply means and returning them to rivers, lakes and marshes again. The so-called dredging work can be performed at the same time by sucking sludge and the like accumulated at the bottom of a river or a lake together with water by water supply means. Further, the present invention enables deodorization and decolorization of factory wastewater and the like containing odorous components, coloring components, and the like, which were difficult to remove with the conventional apparatus.

  As wetland-type water purification treatment systems, those described in Patent Documents 1 to 4 and the like have been proposed. The ones shown in Patent Documents 1 to 3 are used by being installed on surrounding land such as rivers and lakes. In addition, the technique disclosed in Patent Document 4 is used while floating on a water surface such as a river or a lake.

Patent Literatures 1 to 4 and the like all proliferate a variety of aquatic plants such as submerged plants, floating plants, and drafting plants in an artificial wetland, and absorb nutrients of the aquatic plants themselves, and adherent organisms based on aquatic plants. The principle is to promote water purification, especially removal of organic matter, by a combined action such as nutrient absorption, nitrification, denitrification, and precipitation of phosphorus due to weakened water flow in aquatic plants. Then, in order to remove odor components and coloring components other than organic substances, a special decoloring and decoloring apparatus by activated carbon treatment or ozone treatment was required.
JP-A-8-10796 (FIG. 1) Japanese Patent Application Laid-Open No. 8-66676 (FIG. 2) JP-A-2000-5777 (FIGS. 1 and 2) JP-A-11-226593 (FIG. 1)

  However, in the conventional system as described above, the generation of earth and sand and excess sludge due to long-term operation is inevitable, and although the volume can be reduced to some extent by self-digestion during operation, there is a concern that the purification capacity may decrease due to the accumulation of sludge. . For this reason, in many cases, filtering is performed outside the facility after removing filter media such as gravel and artificial media from the constructed wetland at regular intervals, but this is not only extremely complicated but also requires cleaning. It is not preferable because secondary contamination by water occurs. Also, if the sludge deposited on the water bottom is left for a long time without dredging, it becomes a source of internal pollutants, and there is a problem that water purification does not proceed due to the internal pollutants. Further, in the above-described conventional system, it was difficult to remove odor components, coloring components, and the like contained in water. In order to perform deodorization and decolorization, a dedicated activated carbon treatment device and ozone treatment device are required, and these devices require a large amount of electricity to apply pressure to water and generate ozone, which increases running costs. There was a problem.

  The present invention has been made with a focus on the above-described problems, and separates and collects sludge and dredged sludge generated along with water purification during operation so that these sludges can be efficiently discharged to the outside. It is an object of the present invention to provide a structure capable of stably maintaining the original water purification performance of an artificial wetland for a long period of time. In addition, the present invention uses a porous material having innumerable pores such as charcoal such as charcoal and bamboo charcoal, minerals such as zeolite, and artificial materials such as ceramics as a filter medium for purifying water, so that the filter material is contained in water. By adsorbing and removing odorous components, coloring components, and the like, it is possible to deodorize and decolorize water containing factory wastewater and the like.

The invention according to claim 1 is a tank body which can float on the water surface and purifies with a purifying member while discharging water taken into the inflow side from the outflow side, and supplies water to the inflow side. A water supply means, and a floating island type water purification treatment device comprising:
The tank body is provided with a meandering water passage that is meandering multiple times from the inlet side to the discharge side, and the horizontal permeation and the vertical permeation are repeated in the process of flowing water in the meandering water channel toward the discharge side. In addition to gradually accelerating the purification of flowing water, at least a part of the inside of the tank body is provided with an inner bottom at a position above the bottom through which water and sludge (sediment and the like) contained in the water can pass. By making a heavy bottom structure, forming a sludge storage portion between the midsole and the bottom portion, by providing a sludge discharge portion in this sludge storage portion,
Sludge accumulated in the sludge storage section can be discharged from the sludge discharge section to the outside of the tank body.

Since the invention of claim 2 includes, as the water supply means, a water supply pump and a pump support member that arranges the water supply pump at a desired water depth position.
The water supply pump can be arranged at a desired water depth position by the pump support member.

Since the invention of claim 3 is provided with a stirring device for stirring the sludge on the water bottom,
With the agitating device, the sludge at the bottom of the water is stirred and supplied to the inflow side as sludge water, so that purification of water quality and dredging of sludge accumulated at the bottom of the water can be performed simultaneously.

Since the invention of claim 4 includes a float for imparting buoyancy detachable from the tank body,
The buoyancy of the tank can be adjusted.

The invention according to claim 5 is configured such that the purifying means includes a filter medium and a group of aquatic plants vegetated on the filter medium.
Sludge and the like are removed from water by the filter medium, and substances such as phosphorus and nitrogen that cannot be removed by the filter medium are absorbed as nutrients of the aquatic plant group.

In the invention of claim 6, at least a part of the filter medium is made of a porous material such as charcoal, mineral, or artificial material.
Even when the water to be treated contains odor components, coloring components, and the like, these odor components, coloring components, and the like can be adsorbed and removed by the porous filter material.

According to the invention of claim 7, the upstream part of the meandering water channel is a pretreatment section for the purpose of sand and mud separation, and the other part is a permeation section. Or because the sludge storage unit based on the double bottom structure with a pretreatment unit for water and sludge is provided on at least a part of the upstream side of the infiltration unit,
The sludge separated from the water falls in the pretreatment section exclusively and accumulates in the sludge storage section.

According to the invention of claim 8, since the other end of the sludge discharge pipe having one end facing the sludge storage portion is opened outside the tank body,
Sludge from the sludge storage section can be discharged from the opening.

According to the ninth aspect of the present invention, the negative pressure suction means is connected to the other end opening of the sludge discharge pipe.
Sludge accumulated in the sludge storage section can be forcibly discharged by negative pressure suction.

Prior to the discharge of sludge from the other end opening of the sludge discharge pipe, the invention of claim 10 blows the cleaning medium into the sludge storage section using the sludge discharge pipe,
It becomes possible to wash the filter medium disposed above the sludge storage unit.

  According to the first aspect of the present invention, the sludge deposited in the sludge storage section can be taken out to the outside very easily, so that the workability of the sludge treatment can be greatly improved and the problem of secondary pollution as in the prior art can be achieved. And the water purification function of the constructed wetland can be stably maintained over a long period of time. As a result, the purification ability in the same area can be dramatically improved, and Can be easily moved and installed at a desired position.

  According to the second aspect of the present invention, the water at a desired depth can be supplied to the inflow side by moving the water supply pump to a position near the water surface or the bottom of the water.

  According to the third aspect of the present invention, the sludge collected on the water bottom is stirred by the stirring device, and the sludge water is supplied to the inflow side by the water supply means, thereby effectively performing the dredging work of the sludge collected on the water bottom. be able to.

  According to the fourth aspect of the present invention, the float can be attached to and detached from the tank body. Therefore, when the float is used floating on the water surface, a necessary buoyancy can be obtained by attaching the float as necessary. In addition, when the float is unnecessary, for example, when the water purification treatment apparatus is installed on the ground such as a river or a lake, the float can be removed.

  According to the fifth aspect of the present invention, the water purification function is further improved by the synergistic effect of the filtration of the sand and mud by the filter medium and the biological treatment by the aquatic plant group.

According to the invention of claim 6, since at least a part of the filter medium is formed of a porous material such as charcoal, minerals, and artificial materials, odor components, coloring components, and the like contained in water are adsorbed and removed. In addition to purifying water from lakes and lakes, it can be used as a treatment facility for factory wastewater to remove deodorants and decolorize wastewater, and remove harmful components. Therefore, in order to remove odor components, coloring components, and the like contained in the water to be treated, a dedicated deodorizing and decoloring device using, for example, ozone is not required, and a deodorizing and decoloring device using the above-described ozone is unnecessary. Since a large amount of electricity is not required, running costs can be reduced.

  According to the seventh aspect of the present invention, sludge separated from water can be intensively stored in the sludge storage unit in the pretreatment unit.

  According to the invention of claim 8, since the sludge accumulated in the sludge storage section is discharged through the sludge discharge pipe, the discharge of the sludge can be performed more easily and efficiently. If the sludge is forcibly discharged by the negative pressure suction means, the effect becomes more remarkable.

  According to the tenth aspect of the present invention, even the filter material can be washed using the sludge discharge pipe, so that the sludge discharge efficiency is further improved and the original water purification performance can be restored by purifying the filter material. .

  1 to 5 are diagrams showing a preferred embodiment of a floating island type water purification treatment apparatus according to the present invention. FIG. 1 is a schematic plan view, and FIGS. 2 to 5 are lines AA in FIG. The cross-sectional views along the line B, the line CC, and the line DD are shown, respectively.

  As shown in FIGS. 1 and 2, the floating island type water purification treatment apparatus 1 is capable of floating on the surface of a river or a lake, and discharges water 3 from a lake or marsh taken into an inflow port 2a to an outlet 2b. , A purifying member 4 provided in the tank 2 for purifying the water 3 taken into the inflow port 2a while the water 3 is discharged from the discharge port 2b, and a buoyant force in the tub 2 And a water supply means 6 for supplying water 3 to the inflow port 2a side.

  The tank body 2 is formed in a box shape such as a rectangular shape having an impermeable peripheral wall 11 and a bottom wall 12 such as fiber reinforced plastic (FRP) and lightweight concrete.

  The inside of the tank body 2 is partitioned by a plurality of partition walls 13, 13... Parallel to each other, and one end of each partition wall 13, 13. A plurality of meandering water passages 14 meandering from the inflow port 2a side to the discharge port 2b side are formed by the plurality of partition walls 13, 13,... So that the residence time of the water 3 in the tank body 2 is allowed. Care is taken to ensure as long as possible. The open part 13a formed by a part of each of the partition walls 13, 13... Corresponds to a turn-back part where the flow of the water 3 largely changes direction. The channel width is narrower than other parts.

  Further, the inside of the tank body 2 is finely partitioned by a plurality of lower permeation plates 15, 15 ... and upper overflow plates 16, 16 ... alternately arranged so as to intersect with the partition walls 13, 13 .... As is clear from FIGS. 3 to 5, these lower permeation plates 15, 15, and upper overflow plates 16, 16, ... block the water 3 flowing in the meandering channel 14 to allow the residence time in the tank body 2. The lower osmosis plates 15, 15... Allow the water 3 to flow only on the lower side, while the upper overflow plates 16, 16. Distribution will be allowed. Therefore, in the process in which the water 3 in the tank body 2 flows from the inflow port 2a side to the discharge port 2b side, the horizontal permeation along the meandering channel 14 and the lower permeation plates 15, 15. Purification is achieved by repeating the vertical infiltration when overcoming 16 ... many times.

  As shown in FIG. 1, a part of the meandering channel 14 on the upstream side near the inlet 2 a is a pretreatment unit 17, and the other part is a permeation unit 18. A sludge storage unit 19 is provided at the bottom of a part of the upstream side of the pretreatment unit 17 and the permeation unit 18.

  As shown in FIG. 2, the sludge storage unit 19 has a double bottom structure in which an intermediate bottom 20 that allows the passage of water and sludge is provided in a part of the upstream side of the pretreatment unit 17 and the permeation unit 18. The sludge storage space 21 is formed between the inner bottom 20 and the bottom wall 12.

  The inner bottom 20 is formed by providing a bar-shaped gantry 20a provided at a predetermined pitch above the bottom wall 12 and a mesh-shaped or lattice-shaped receiving plate 20b at a predetermined pitch. The insole 20 is configured to hold a first filter medium 31 and a second filter medium 32 constituting the purifying member 4 described below so as not to fall.

  The length of the pretreatment unit 17 and the length of the sludge storage unit 19 are appropriately increased or decreased according to the degree of contamination of the water to be purified. Further, a sludge confirmation pipe 22 as shown in FIG. 6 is provided as a sludge confirmation hole at a plurality of portions of the pretreatment section 17 and a part of the infiltration section 18 corresponding to the sludge storage section 19, and the tip thereof is sludge. It faces the storage unit 19 (sludge storage space 21). As a result, the state of accumulation and storage of sludge can be observed and confirmed using a zone meter and a sludge detector. When the sludge confirmation pipe 22 is not used, its upper end opening is closed by a cap (not shown) so as to prevent intrusion of foreign matters and the like.

  Further, a sludge discharge pipe 23 is provided in the sludge storage section 19 including a part of the pretreatment section 17 and the permeation section 18. As shown in FIG. 7, the sludge discharge pipe 23 has a tip end branched into a plurality of branch pipes 23a, 23a,..., And in order to secure an opening area in the sludge storage section 19 as large as possible. The distal end surface of the branch pipe 23a is cut obliquely to open upward. The other end of the sludge discharge pipe 23 is drawn out of the tank body 2 and forms a predetermined joint 25 so that it can be connected to, for example, a suction hose on the side of a vacuum car 24 as negative pressure suction means.

  Next, the purifying member 4 will be described. As shown in FIG. 2, the purification member 4 is vegetated on the first filter medium 31 disposed in the pretreatment section 17, the second filter medium 32 disposed in the permeation section 11, and the second filter medium 32. And an aqueous plant group 33.

  The first filter medium 31 sediments the sludge contained in the water 3 taken in from the inflow port 2 to actively promote the separation of the sand and mud, and purifies raw water having a high degree of pollution by biodegradation. It is intended to reduce the pollution load, and is formed of, for example, a fibrous or plate-like plastic material as a filter material (purification medium) with relatively little clogging.

  The second filter medium 32 is formed of gravel, gravel, granular plastic filter medium, palm fiber, and the like for collecting and filtering sludge that cannot be separated by the first filter medium 31.

  When the water 3 contains an odor component, a coloring component, a harmful component, or the like, the first filter medium 31 or the second filter medium 32 is used instead of or together with the first filter medium 31 or the second filter medium 32. By using a porous material having a myriad of pores, such as charcoal such as charcoal and bamboo charcoal, minerals such as zeolite, and artificial materials such as ceramics, the odor component and coloring component contained in the water 3 are harmful. Components are adsorbed and removed.

  The aqueous plant group 33 is formed by planting plants growing on the waterside, such as reeds, cattails, irises, and shrubs, and plants growing on the water surface, such as water hyacinth, in the second filter medium 32, and contained in the water by these plants. It purifies water by absorbing nutrients such as phosphorus and nitrogen.

  The float 5 is formed of a material having a high buoyancy such as a foaming resin or a hollow member having a small specific gravity so as to obtain a large buoyancy, and is detachably attached to the peripheral wall 11 and the bottom wall 12 of the tank body 2. Installed.

  As shown in FIGS. 8 and 9, the water supply means 6 is provided so as to cover a water supply pump 41, a pump support member 42 for installing the water supply pump 41 at a desired water depth position, and a periphery of the water supply pump 41. And a water supply pipe 45 for injecting water pumped up by the water supply pump 41 through the water intake pit 43 into the inflow port 2a side of the tank body 2 through the measuring tank 44. ing. A stirrer (not shown) for stirring the bottom sludge 50 is provided in the vicinity of the feed pump 41, and the bottom sludge is stirred and pumped together with water by the feed pump 41 to be supplied to the inlet 2a side. That is, dredging.

  The pump support member 42 changes the water depth position of the water supply pump 41 by changing the attachment position to the tank body 2, or makes the water supply pump 41 a desired water depth by making the pump support member 42 expandable and contractible. It can be installed at a location. In the embodiment shown in the drawings, a submersible pump is used for the water supply pump 41 and the pump is installed in the water by the pump support member 42, but a water-installed pump is used for the water supply pump 41. The pump may be arranged, for example, on the float 5 and a water supply pipe connected to the water supply port of the water supply pump 41 may be inserted into the water to arrange the water supply port of the water supply pipe at a desired water depth position.

  Next, the method of use and operation of the floating island type water purification treatment device 1 of the present invention will be described. The floating island type water purification apparatus 1 of the present invention is used in a state of being positioned on the water by an anchor 51 as shown in FIG. 10 or in a state of being connected to a shore by a rope 52 or the like as shown in FIG. You.

  Then, as shown in FIG. 8, for example, the water supply pump 41 is sunk down to the bottom of the water, the sludge on the water bottom is stirred by the stirring device, and the water containing the sludge is pumped up by the water supply pump 41 while dredging, and the inflow port 2a side Flows into. The water 3 supplied to the inflow port 2 a side is first filtered by the first filter medium 31 in the pretreatment unit 17, and sand and pebbles contained in the sludge and the like settle and deposit in the sludge storage unit 19. Is done. On the other hand, the water that has passed through the pretreatment section 17 is guided to the infiltration section 18, purified by the second filter medium 32 and the aqueous plant group 33, and discharged again from the discharge port 2 b to a river, lake or marsh.

  Here, as described above, the folded portion of the meandering channel 14, that is, the partially cut open portion 13a of each of the partition walls 13, 13,... Makes the channel narrower than the other portions because of the folded portion. This is because the flow rate in the section is relatively increased to avoid intensive sedimentation and accumulation of sludge in the section.

  Then, when a predetermined amount or more of sludge is accumulated and stored in the sludge storage unit 19, the operation of the water supply pump 41 is stopped, or the sludge is discharged as shown in FIG. By connecting the hose on the side of the vacuum car 24 to the joint 25 of the sludge discharge pipe 23 provided in the storage unit 19 and sucking it by negative pressure suction, the sludge settled and deposited in the sludge storage unit 19 is extremely efficient. Can be discharged well. Of course, the discharge may be performed by a natural method such as a siphon type without depending on the vacuum vehicle 24.

  On the other hand, as shown in FIG. 6, a compressor 26 is prepared together with a vacuum wheel 24, and compressed air is blown from the compressor 26 into the inside of the sludge discharge pipe 23 as a cleaning medium prior to the forced discharge of the sludge by the vacuum wheel 24. The first filter medium 31 and the second filter medium 32 in the storage unit 19 can be washed. That is, as shown in FIGS. 6 and 7, compressed air is jetted upward from the opening of the end of the sludge discharge pipe 23 to wash off the sludge adhering to the first filter medium 31 and the second filter medium 32, and to remove those sludge. Are allowed to settle in the sludge storage unit 19 until they settle. Then, if the sludge is sucked by the vacuum vehicle 24 after the elapse of a predetermined time as described above, the cleaning of the first filter medium 31 and the second filter medium 32 and the discharge of the sludge can be performed continuously, and The continuous operation of the water purification apparatus 1 for a longer period of time becomes possible. When the purification of the water quality and the dredging of the sludge at the place where the floating island type water purification treatment apparatus 1 is installed are completed, the floating island type water purification treatment apparatus 1 is moved to another place to purify the water quality of the place and the dredging of the sludge. Perform

  When the floating island type water purification treatment device 1 is used as a treatment device for factory wastewater or the like to remove odor components, coloring components, harmful components, and the like contained in the wastewater, the second filter medium 32 is used. Instead of gravel, gravel, granular plastic filter media, palm fiber, etc., or together with these gravel, gravel, granular plastic filter media, palm fiber, etc., charcoal such as charcoal or bamboo charcoal, minerals such as zeolite, ceramics, etc. By using such a porous material having innumerable pores, odor components, coloring components, harmful components, and the like contained in wastewater are adsorbed and removed. If the factory wastewater does not contain sludge or the like, and thus the first filter medium 31 is unnecessary, the first filter medium 31 is eliminated and the entire filter medium is replaced with charcoal such as charcoal or bamboo charcoal. Minerals such as zeolites, porous materials such as artificial materials such as ceramics, or gravel, gravel, granular plastic filter media, palm fibers, etc., charcoal such as charcoal and bamboo charcoal, minerals such as zeolites, ceramics And a porous material having an innumerable number of pores such as an artificial product, and the like, and the factory wastewater may be supplied to the inflow port 2a side. Other configurations are the same as those of the basic embodiment shown in the drawings, and a duplicate description will be omitted.

FIG. 1 is an explanatory plan view showing a preferred embodiment of a system according to the present invention. Sectional explanatory drawing which follows the AA line of FIG. Sectional explanatory drawing which follows the BB line of FIG. Sectional explanatory drawing which follows CC line of FIG. Sectional explanatory drawing which follows the DD line of FIG. FIG. 3 is an explanatory diagram of a function in which main parts of FIG. 2 are enlarged. FIG. 7 is an explanatory plan view of a main part of FIG. 6. Sectional explanatory drawing which follows the EE line | wire of FIG. The enlarged view of the principal part of FIG. Explanatory drawing which shows the state moored on the water by the anchor. Explanatory drawing which shows the state moored on the water with a rope.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Floating island type water purification apparatus 2 ... Tank body 2a ... Inlet 2b ... Discharge port 3 ... Water 4 ... Purification member 5 ... Float 6 ... Water supply means 11 ... Peripheral wall (wall part)
12 ... Bottom wall (wall)
DESCRIPTION OF SYMBOLS 13 ... Partition wall 14 ... Meandering water channel 15 ... Lower permeation plate 16 ... Upper overflow plate 17 ... Pretreatment part 18 ... Permeation part 19 ... Sludge storage part 20 ... Middle bottom 21 ... Sludge storage space 23 ... Sludge discharge pipe 24 ... Vacuum Car (negative pressure suction means)
26 Compressor 31 First filter medium 32 Second filter medium 33 Aqueous plant group

Claims (10)

A tank body that can float on the water surface and purifies with a purifying member while discharging water taken into the inflow port from the discharge port side, and a water supply unit that supplies water to the inflow port side. ,
The tank body is provided with a meandering water channel that is meandering several times from the inlet side to the discharge port side, and the horizontal permeation and vertical permeation are repeated in the process of flowing water in the meandering water channel toward the discharge side. A double-bottom structure that gradually promotes water purification and installs an insole through which water and sludge contained in water can pass at least at a position above the bottom in a part of the tank body Wherein a sludge storage section is formed between the bottom and the inner bottom, and the sludge storage section is provided with a sludge discharge section for discharging accumulated sludge to the outside. 2. The floating island type water purification apparatus according to claim 1, wherein the water supply means includes a water supply pump and a pump support member for arranging the water supply pump at a desired water depth position. The floating island type water purification treatment apparatus according to claim 2, further comprising a stirrer for stirring the sludge at the bottom of the water. The floating island type water purification apparatus according to claim 1, further comprising a float for imparting buoyancy detachable from the tank body. 2. The floating island type water purification treatment device according to claim 1, wherein the purification member includes a filter medium and a group of aquatic plants vegetated on the filter medium. 3. The floating island type water purification treatment apparatus according to claim 5, wherein at least a part of the filter medium is formed of a porous material such as charcoal, a mineral, or an artificial product. A part of the meandering waterway on the upstream side is a pretreatment section for the purpose of sand and mud separation, and the other part is a permeation section,
The floating island type according to any one of claims 1 to 6, wherein the pretreatment section alone or at least a part of the upstream side of the permeation section is provided with a sludge storage section based on a double bottom structure together with the pretreatment section. Water purification treatment equipment. The other end of the sludge discharge pipe having one end facing the sludge storage section is open to the outside of the tank body, and the sludge of the sludge storage section is discharged to the outside of the tank body from this opening. The floating island type water purification apparatus according to any one of claims 1 to 7, wherein The negative pressure suction means is connected to the other end opening of the sludge discharge pipe, so that the sludge in the sludge storage section can be forcibly discharged by the negative pressure suction force. Floating island type water purification equipment. Prior to discharging the sludge from the other end opening of the sludge discharge pipe, a cleaning medium is blown into the sludge storage section using the sludge discharge pipe, whereby the filter medium above the sludge storage section can be cleaned. The floating island type water purification treatment device according to claim 8 or 9, wherein:

Images