JPH09106A - Sea area cleaning zone - Google Patents

Abstract

PURPOSE: To solve the eutrophic state of a closed sea area, etc., by installing a bioreactor having an apparatus for housing a fine alga in the interior, pumping up sea water in the vicinity of the bottom of the sea and recovering a multiplied fine alga near the surface of the sea, immobilizing and removing a nutrient salt of nitrogen, phosphorus, etc. CONSTITUTION: A bioreactor 1 having an apparatus 11 for housing a fine alga in the interior, pumping up sea water in the vicinity of the bottom of the sea by an air lift pump 7 and recovering a multiplied fine alga is installed near the surface of the sea by a float 2 and the inner sea water is separated from the outer sea water. The fine alga is multiplied in the bioreactor 1 and nitrogen and phosphorus as nutrient salts are immobilized by photosynthesis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sea area purification, and more particularly, to a sea area purification apparatus which is extremely effective in preventing the occurrence of red tide in closed sea areas.

[0002]

2. Description of the Related Art In recent years, red tides frequently occur in closed sea areas where the fluidity of seawater is poor, and this has caused great damage to fisheries. That is, fish are generally cultivated in such a closed sea area, but if a red tide occurs in this sea area, the cultured fish will be killed and serious damage will occur.

By the way, 90% of the red tide occurrence in Japan is due to shuttella (a kind of rafido algae). The conditions for generating this shutteller are that the solar radiation increases and the low water temperature in the water causes dormant spores (cysts). Reaching a temperature suitable for germination (around 20 ° C), having sufficient nutrient salts such as nitrogen and phosphorus in seawater, and being in a so-called eutrophication state. Being present at a shallower water level (7 to 8 m or less), that is, even if the seawater is eutrophic, phytoplankton called diatoms or dinoflagellates are the priority species in the surface layer. Grows until there is no nutrient in the part. Therefore, Shutnera, which is the source of red tide, does not grow in this surface layer. However, when the sea surface is calm and vertical mixing of seawater does not occur, the stratification of nutrient salts
Is present in the red tide growth slide shallow (7-8m or shallower),
At night, this shutteller uses flagella to descend into the stratum corneum (stratification) of this nutrient and exclusively ingest this nutrient. Then, during the daytime, it rises to the surface layer and undergoes photosynthesis by sunlight to proliferate, which becomes the red tide.

At present, there is no effective means for preventing red tide generation, and from the present situation, the present inventors jet air from the sea at a depth of about 10 m to perform vertical mixing and stirring, specifically, at a depth of 7-8.
We proposed a method of destroying the stratum basin of nutrients existing at a depth of less than m and dropping it to around 10 m. (Japanese Patent Application No. 5-30479)

[0005]

Therefore, the inventors of the present invention focused on the second condition among the above-mentioned three conditions, immobilizing and removing nutrient salts such as nitrogen and phosphorus, and thereby enriching the entire sea area. It is to eliminate the commutation state.

[0006]

The present invention has been made in order to solve the above-mentioned problems, and it is installed near the sea surface, contains microalgae inside, and the inside seawater can flow out. It comprises a bioreactor 1 configured as described above, a pumping device for pumping seawater in a relatively deep sea area into the bioreactor 1 by an air lift pump 7, and an algae recovery device for recovering microalgae in the bioreactor 1. ing.

The bioreactor 1 is composed of a floating body 2 installed on the surface of the sea, a water-permeable or impermeable wall body 3 and a bottom body 4 which are arranged under the floating body 2. Then, a plurality of funnel bodies 12a to 12a arranged at predetermined intervals in the bioreactor 1 and arranged near the sea surface
12n, a connecting pipe 13 connecting the funnel bodies 12a to 12n, a concentrator 14 to which the connecting pipe 13 is connected,
A series of equipment is constituted by a transport pump 15 for transporting the microalgae collected and concentrated by the concentrator 14 to an algal processing plant 16.

[0008] Preferably, an air ejection device is installed in the bioreactor 1 at a predetermined interval in the vicinity of the bottom body 4, and seawater in the bioreactor 1 is mixed to accelerate the growth rate of microalgae.

[0009]

[Operation] According to such a sea area purification device, the seawater at the bottom, that is, the seawater containing nutrient salts, is pumped into the bioreactor by an air lift pump to grow microalgae in the bioreactor to remove nitrogen and phosphorus. Fix by photosynthesis. The nitrogen and phosphorus are recovered and removed together with the microalgae by an algae recovery device, and if necessary, they are reused in the algae processing plant as, for example, bait for fisheries, soil improver, and the like.

[0010]

EXAMPLE An example of the present invention will be described below with reference to the drawings. The figure shows a schematic perspective view of a sea area purification apparatus according to the present invention, wherein 1 is a bioreactor installed near the sea surface and containing microalgae inside, and this bioreactor 1 is installed on the sea surface. Floating body 2 and this floating body 2
Water-permeable or water-impermeable wall 3 that is placed downwards
And the bottom body 4.

The bioreactor 1 is moored at a predetermined position by a plurality of mooring lines 5. Reference numeral 6 denotes a tubular body that constitutes an air lift pump 7 that is a pumping device. A lower end 6a of the tubular body 6 is located near the bottom portion, and an upper end 6b is a central portion in the bioreactor 1 and the sea surface. It is arranged so that it is located above. An air jet nozzle 8 is arranged below the tubular body 6, and the air jet nozzle 8 is provided.
Compressed air is supplied from the compressor 9 through the air pipe 10. That is, seawater containing nutrient salts existing in the vicinity of the bottom is pumped by the air lift pump having the above configuration. As described above, the cylinder 6, the ejection nozzle 8, and the compressor 9 constitute an air lift pump 7 as a water pumping device.

Reference numeral 11 denotes an algae recovery device. This algae recovery device 11 has a plurality of funnel bodies 12a to 12n and a connecting pipe 13.
And a concentrating device 14 and a transport pump 15.
More specifically, the funnel bodies 12a to 12n are circularly arranged in the bioreactor 1 so as to be located at a predetermined interval and near the sea surface, and each of the funnel bodies 12a to 12n.
The lower end of 12n is connected by a connecting pipe 13. Further, the connection pipe 13 is connected to a concentration device 14. The concentrator 14 is connected to an algae processing plant 16 by a transport pipe 17 via a transport pump 15.

In the above structure, the bioreactor 1 contains microalgae in advance, and when the compressor 9 is operated to supply compressed air to the jet nozzle 8, the air jetted from the nozzle 8 becomes bubbles. It is supplied to the tubular body 6 and rises in the tubular body 6. At this time, the seawater near the bottom is pumped into the bioreactor 1 by the air lift pump 7. Since the pumped seawater is in a eutrophic state containing nutrient salts, microalgae grow in the bioreactor 1 to fix the nutrient salts nitrogen and phosphorus by photosynthesis.

The microalgae thus proliferated flow into the funnel bodies 12a to 12n together with the seawater and enter the concentrating device 14 through the connecting pipe 13, where the seawater containing the microalgae is concentrated and a part of the seawater is obtained. Separated and drained. Then, the concentrated seawater is supplied to the algae processing plant 16 through the transport pipe 17 by the transport pump 15, and is regenerated into, for example, aquatic feed and soil conditioner.

Although not shown in this embodiment,
In the case of a large bioreactor, in order to promote photosynthesis, an air ejection device is installed in the bioreactor at a predetermined interval in the vicinity of the bottom body 4, seawater in the bioreactor is mixed, and microalgae are grown. It is good to speed up.

[0016]

EFFECTS OF THE INVENTION As is clear from the above description, the marine purification apparatus according to the present invention is a bioreactor installed near the sea surface, containing microalgae inside, and capable of discharging seawater inside. 1, a pumping device for pumping the bottom seawater into the bioreactor 1 by an airlift pump 7, and an algae recovery device for recovering microalgae in the bioreactor 1.

Therefore, not only can the eutrophied seawater near the bottom be pumped up and purified, and as a result, the generation of red tide can be prevented, but nitrogen and phosphorus are fixedly recovered by microalgae and regenerated. There is an effect that it can be used.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bioreactor 2 Floating body 3 Wall 4 Bottom 5 Mooring line 6 Cylindrical body 7 Air lift pump 8 Jet nozzle 9 Compressor 10 Air pipe 11 Algae recovery device 12a Funnel 13 Connecting pipe 14 Concentrator 15 Transport pump 16 Algae processing plant 17 Transport Pipe

Claims (3)

[Claims] 1. A bioreactor 1 installed near the sea surface, containing microalgae inside, and partitioning internal seawater and external seawater, and seawater near the seabed is pumped into the bioreactor 1 by an air lift pump 7. A pumping device to
An algae recovery device comprising an algae recovery device for recovering microalgae in the bioreactor 1. 2. A floating body 2 installed on the sea surface, and this floating body 2
2. The bioreactor according to claim 1, wherein the bioreactor comprises a bottom body 4 and a water-impermeable or water-impermeable wall body 3 disposed at a lower portion of the bioreactor. 3. 3. A plurality of funnel bodies 12a to 12a arranged in the bioreactor 1 at predetermined intervals and arranged near the sea surface.
12n, a connecting pipe 13 connecting the funnel bodies 12a to 12n, a concentrator 14 to which the connecting pipe 13 is connected,
The algal collecting apparatus according to claim 1, further comprising a transport pump (15) for transporting the microalgae collected and concentrated by the concentrating apparatus (14) to an algal processing plant (16).