View of Nambu Wastewater Treatment Plant
This is the only water reclamation center in Yokohama City that is surrounded by the sea.
Request: Please note that Nambu Wastewater Treatment Plant is closed to anyone other than those involved in the maintenance of facilities.
Wild birds gathering at the center
Aiming for a bird, a river cicada | Photographing Location | Final sedimentation pond Triangular Weir |
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| Name | Kazemi |
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Birds aiming for fish in the observation pond | Photographing Location | Waterway of the viewing pond |
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| Name | Gossagi |
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Birds whose handrails | Photographing Location | Final sedimentation pond Handrail |
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| Name | And squirrel |
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A little bird looking for food | Photographing Location | Green space beside the air wing building |
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| Name | Cocktail |
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Intruders in the trees | Photographing Location | Cherry tree beside the regulating tank |
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| Name | Squirrel |
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With flowers | Photographing Location | sedimentation pond side plum tree |
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| Name | Medicinal |
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A secret story together | Photographing Location | sedimentation pond side cherry tree |
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| Name | Kawara |
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Sewage discharged from homes and businesses becomes clean water through various processes.
The water (referred to as "treated water") is discharged to Tokyo Bay from the discharge port introduced here.
You can see it from the deck.
This tour deck was made from waste materials.
It seems that treated water is flowing from the outlet.
You can see the molecules.
Microorganisms active in the center
Monostyla (Monstyla) Japanese name: Eagle
| Characteristics |
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Size: 150～250μm
The instep consists of two insteps, oval or circular, short limbs, and has a long toe. The toes have a third cone at the tip and a crack at the center tip.
It may appear in large quantities, and at that time the treated water becomes cloudy. However, fungi (mold), which is a predator, appears immediately and quickly drops. |
Prorodon (Prorodon) Japanese name: Mizuta beetle
| Characteristics |
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Size: 130～200μm
It is a large oval shape and can exceed 300 μm when it grows. Swimming while rotating, prey on small ciliais.
Appears when the condition of the aeration tank appears to be dismantled. |
Diprogaster (Diprogaster) 
| Characteristics |
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Size: Around 1000 μm
Because it appears under various conditions, it does not become an indicator organism. I dive into flocs and eat bacteria.
It is said that such nematodes are generated at sludge accumulation sites. |
Spirostomum (Spirostomum) Japanese name: Shrub worm
| Characteristics |
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Size: 150～400μm
Long cylinder shape and large. These companions include the largest species of protozoa, which is more than 3 mm.
The aeration tank at the time of appearance is generally strong. |
Epistylis (Epistylis)
| Characteristics |
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Insects body length: 50～200μm
The head of the insect body is a beloved glass and the handle is branched, forming a group.
When it appears alone, the activated sludge is in good condition. In the case of a group, there are many times when it is a little dismantled. In addition, when the survival environment worsens, such as demolition progresses, the head of the insect body breaks and swims to a good place. |
Correps (Coleps) Japanese name: Rattle beetle, hornet
| Characteristics |
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Size: 45～60μm
It is egg-shaped or barrel shape and covered with hard leather. Swimming while rotating, it's pretty fast. It eats bacteria and microfoils.
Appears when nitrification is progressing and the DO is kept at high. |
Arcella (Arcella) Japanese name: Nabe Camry
| Characteristics |
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Size: 30～250μm
Ameba family in a hemispherical shell. Move your feet out of the bottom. It feeds bacteria, algae, etc.
If you're fine, there will be a few tactile arms. |
Rotaria (Rotaria) Japanese name: Tall beetle
| Characteristics |
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Size: 300～500μm
Moving between flocs while stretching like a hill. When the floc becomes smaller, they may swim around by turning the cilia in the head. It eats small whipworms and bacteria. |
Chaetonotus (Chaetonotus) Japanese name: Beetle
| Characteristics |
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Size: 100～200μm
The insect's body is similar to a weasel. Swimming smoothly and quickly.
Since activated sludge appears during the dismantling and dismantling period, the treated water at the time of appearance is good, but the permeability is often one step further. It eats microorganisms and algae. |
Amoeba (Amoeba)
| Characteristics |
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Size: Tens to several hundred μm
Moving while changing shapes in various ways. They eat bacteria. |
Macrobiotus
| Characteristics |
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Size: 200～1000μm
Walk slowly with a nailed foot and suck food with a needle in your mouth. As the name suggests, it looks like a bear. They grow eggs and grow. |
・This is an official course held in February every year, and the hall is open on the day of the Kanagawa Marathon.
We are looking for a facility tour.
You can actually observe the outline of the sewerage business and the process of regenerating dirty water and turning it into clean water.
If you would like to visit the facility, please contact the following. (Reception and tours are available only on weekdays.)
