JPH091181A - Floating photosynthesis reactor - Google Patents

Abstract

PURPOSE: To provide the reactor capable of suppressing temp. rising therein can be controlled and being stirred sufficiently. CONSTITUTION: This reactor 16 which contains photosynthetic microorganisms capable of producing hydrogen by decomposing organic matter in waste water through utilization of sunlight, is installed in a floating state on a water surface 11 such as sea surface, in which a way that a roof section 21 of the reactor 16 is formed so as to have a multiple chevron shape and the lower part of the roof section 21 is half sunk under the water surface 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosynthetic reactor using photosynthetic microorganisms, and more particularly to a floating photosynthetic reactor in which the photosynthetic reactor is floated on the surface of water such as the sea.

[0002]

2. Description of the Related Art Generally, hydrogen is mainly produced by thermal decomposition of petroleum resources, but in this case, a large amount of fossil fuel is consumed as a raw material and energy, resulting in a large amount of carbon dioxide. There is.

[0003] Therefore, against the background of rapid progress of biotechnology in recent years, a technique for efficiently producing hydrogen by utilizing the function of microorganisms and using sunlight as an energy source has been attracting attention.

In the natural world, there are microorganisms having a hydrogen generating function such as photosynthetic bacteria and cyanobacteria. These microorganisms have the function of efficiently generating hydrogen from water and organic substances using sunlight as energy without consuming fossil fuels such as petroleum, and at the same time, they are capable of self-replicating the hydrogen generating function by multiplication. Can be planned.

Conventionally, as a reactor for treating microorganisms,
There are tank type reactors and pond type migratory reactors installed on land, and typical examples of the purpose of use are aeration tanks for sewage treatment, anaerobic digestion tanks, oxidation ditch (oxidation pond), etc. However, these techniques cannot be directly applied to the growth of photosynthetic microorganisms.

[0006]

[Problems to be Solved by the Invention] When the photosynthetic microorganisms are housed in a reactor to produce hydrogen by photosynthesis, in order for the sunlight to be evenly exposed to the microorganisms, the reactor is a closed type and has a large area. Moreover, it must have a shallow bottom.

However, when sunlight is applied as a hermetically sealed type having a shallow bottom, the temperature inside the reactor rises abnormally, and it is necessary to cool it in order to hinder the growth of microorganisms. Further, it is necessary to supply the organic wastewater containing sugar and the like to the reactor and to sufficiently stir the inside of the reactor, which causes a problem that the apparatus cost increases.

Therefore, an object of the present invention is to solve the above problems and to provide a floating photosynthesis reactor which can suppress the temperature rise in the photosynthesis reactor and can stir well.

[0009]

In order to achieve the above object, the present invention provides a photosynthetic reactor containing a photosynthetic microorganism that decomposes organic substances in wastewater to produce hydrogen by utilizing sunlight. The roof is formed in a mountain shape, and the reactor is floated so that the lower part of the roof is submerged on the surface of water such as the sea.

[0010]

According to the above construction, the reactor containing the photosynthetic microorganisms is floated so that the lower part of the mountain-shaped roof part is submerged in the surface of the water such as the sea. Even if it is stirred and heated by sunlight, it is constantly cooled from below the roof of the reactor with seawater, etc., so that an excessive rise in temperature is suppressed and the temperature at which photosynthetic microorganisms can be maintained can be maintained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 is a quay, and 11 is a water surface such as the sea (coast or offshore), lake or pond. On the quay 10,
Nutrient supply tank 12, precipitation tank 13, anaerobic reactor 14,
A hydrogen storage tank 15 is provided, and on the water surface 11, a photosynthesis reactor 16 for growing photosynthetic microorganisms (strains such as R-1, S-2, K-2Y, and K-6) is semi-submerged on the water surface 11. It is provided by floating.

The anaerobic reactor 14 has a wastewater line 1 for supplying organic wastewater such as sugar into the reactor 14.
7 is connected, and the wastewater outlet of the anaerobic reactor 14 and the inlet 16a of the photosynthesis reactor 16 are treated water inlet lines 18
Connected by The outlet 16b of the photosynthetic reactor 16 and the precipitation tank 13 are connected by a treated water outlet line 19, and the supernatant of the precipitation tank 13 is discharged into the sea by a final treated water line 20.

The lower part 2 of the roof of the photosynthesis reactor 16
A hydrogen pipe 22 composed of a flexible pipe is connected to the top portion 21a of No. 1 and the produced hydrogen is stored in the hydrogen storage tank 15
It is designed to be supplied to and stored in. Further, the top of the anaerobic reactor 14 and the hydrogen storage tank 15 are connected to the hydrogen pipe 2.
3 is connected, and hydrogen generated in the anaerobic reactor 14 can be stored in the hydrogen storage tank 15.

The nutrient supply tank 12 and the photosynthetic reactor 15 are connected by a nutrient supply line 24, and the nutrient such as a nitrogen source is supplied from the nutrient supply tank 12 to the photosynthesis reactor 16 at night.
Can be supplied.

The photosynthesis reactor 16 is, for example, as shown in FIG. 2, a flow path 25 extending from an inlet 16a to an outlet 16b.
Are formed so as to be folded back into a plurality of parts, and the space on each flow path 25 is partitioned so as to form an independent chamber for each flow path 25, and each room has a mountain-like shape below the roof portion. 21 is formed, and a hydrogen pipe 22 (FIG. 1) is connected to each top 21a thereof.

As shown in FIG. 3, the photosynthetic reactor 16
The lower part 21 of the roof is formed for each flow path 25. The lower part 21 of the roof is provided so as to be submerged in the water surface 11 except for the top part 21a, and the sunlight is inserted through the lower part 21 of the reactor 16. To be The buoyancy of the lower roof portion 21 is adjusted so that the lower roof portion 21 faces south, and the lower roof portion 21 is submerged on the water surface 11 except for the top portion 21a, and is fixed by mooring ropes 26. The reactor 16 may be provided so as to rotate or move according to the movement of the sun.

The lower portion 21 of the roof portion is formed of a transparent synthetic resin plate or the like. At this time, it is preferable to stack a heat shield plate for cutting wavelengths in the infrared region that do not contribute to photosynthesis of microorganisms.

It is also possible to form the reactor 16 in two chambers, an upper chamber and a lower chamber, which are anaerobic reactor chambers and an upper chamber is a photosynthetic reactor chamber, respectively.

Next, the operation of the embodiment will be described.

A waste liquid containing 10,000 ppm of glucose, for example, as an organic waste water is supplied from the waste water line 17 to the anaerobic reactor 14, and in the anaerobic reactor 14,
Anaerobic treatment, butyrate 800ppm, acetate 8
Decomposed to 00ppm, 800ppm propionate,
It is supplied from the processing line 18 into the photosynthesis reactor 16.

In the photosynthesis reactor 16, while the supplied wastewater flows along the flow path 25, photosynthetic microorganisms decompose organic matters by using sunlight as energy and generate hydrogen by the photosynthesis reaction. The generated hydrogen is stored in the hydrogen storage tank 15 through the hydrogen pipe 22.

The waste water discharged from the reactor 16 is supplied to the settling tank 13 through the treated water outlet line 19, and the supernatant thereof is discharged into the sea through the final treated water line 20.

The photosynthetic reactor 16 is provided so as to float on the water surface 11 and constantly oscillates by waves, so that the waste water in the reactor 16 can be well stirred and the reactor 16 can be agitated.
Tries to raise the temperature by sunlight, but since the lower part 21 of the roof is partly immersed in the water surface 11, it is cooled from the lower part 21 of the roof, and an excessive rise in temperature is prevented. That is, seawater always passes between the lower roof portions 21, and the lower roof portion 21 is wetted by waves or the like, and even if an attempt is made to raise the temperature, it is cooled by the latent heat of evaporation of water in the lower roof portion 21 and the surrounding seawater. There is no temperature rise.

The photosynthetic reactor 16 has a width of 50 m, a length of 125 m, a wastewater depth of 0.16 m, and a wastewater treatment amount of 100 m ³ per day is 1000-2.
It is possible to produce 000 m ³ / day of hydrogen.

Even if the sunlight is incident on the reactor 16 with the energy of 800 kcal / m ² · h, the water temperature of 45 ° C. is maintained even if the water of 1,000 m ³ at 30 ° C. in the reactor 16 is heated for 10 hours during the day. It does not rise above the above level and does not hinder the growth of photosynthetic microorganisms.

[0027]

In summary, according to the present invention, the reactor containing the photosynthetic microorganisms is floated on the water surface, so that the inside of the reactor is moderately stirred by the waves and is heated by the sunlight. Since the outer periphery of the reactor is constantly cooled with seawater, excessive temperature rise is suppressed and the temperature can be maintained at a level at which photosynthetic microorganisms can act.

[Brief description of the drawings]

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

FIG. 2 is a plan sectional view showing a flow path of the photosynthesis reactor of FIG.

3 is a cross-sectional view of the photosynthetic reactor of FIG.

[Explanation of symbols]

 11 Water Surface 15 Hydrogen Storage Tank 16 Photosynthesis Reactor 18 Treated Water Inlet Line 21 Below Roof

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display part // (C12P 3/00 C12R 1:01) (C12P 3/00 C12R 1:89) (72) Inventor Shigeru Uchiyama 2-8-11 Nishi-shinbashi, Minato-ku, Tokyo Foundation Lawyer Institute for Global Environmental Industrial Technology CO2 fixation etc. Project room (72) Inventor Sakae Fukunaga 2-8-11 Nishi-shinbashi, Minato-ku, Tokyo Institute for Global Environment and Industrial Technology CO2 Immobilization Project Room (72) Inventor Masayuki Izumi 2-8-11 Nishishinbashi, Minato-ku, Tokyo Foundation Office National Institute for Global Environmental Technology Research CO2 Immobilization Project Room

Claims (1)

[Claims] 1. A photosynthetic reactor containing photosynthetic microorganisms that decomposes organic matter in wastewater using sunlight to produce hydrogen. The roof of the photosynthetic reactor is formed in a mountain shape, and the lower part of the roof is A floating photosynthetic reactor characterized in that the reactor is floated so as to be submerged in the water such as the sea.