KUBOTA Corporation founded in 1890, it has been devoting to develop not only agricultural machines but also various kinds of products in environmental technologies. Japanese unique wastewater treatment plant which is called “Johkasou” is one of those products. Johkasou has been in business for over 45 years.

Domestic Plants

Domestic KUBOTA plants area mainly focused on house’s and small scale hotels and stores. One more step in space-saving installation. The tank itself is the smallest design in the world.

Commercial Plants

Commercial KUBOTA plants are mainly focused on mid and large scale hotels, stores and apartments building. Compact design helps reduce excavation and construction cost.

Technologies used in the Kubota System

                                     Membrane Bioreactor System:                                 KUBOTA Submerged Membrane Unit ® 

The KUBOTA Submerged Membrane Unit® incorporates microporous membranes made from polyolefin. Although fluids smaller than the membrane's microspores can permeate the membrane, contaminated ingredients cannot permeate it due to their larger size. Furthermore, contaminants are pulled to the membrane surface. Water flow created by aeration, and air bubbles contact the membrane's surface, which then move upward while vibrating the surface. This keeps the membrane surface always clean and prevents the microspores from clogging. Readmore..

        Moving Bed Carrier Filter Method

Moving Bed Carrier Filter Method is a wastewater treatment process, which treat impurities in wastewater by aerobic microorganism adsorbed in media within an aeration tank. Sending air to aeration tank by blower in order to supply oxygen to microorganism adsorbed in media and thus to make good contact between wastewater and media, offering high efficient treatment performance. Each media provides large surface to support the growth of high-density population of microorganism. This system delivers cost-effective, easy-to-install and stable treatment performance within compact design. Readmore..

What’s happening in KUBOTA

Kubota's environmental friendly wastewater treatment plants (Johkasou)

Kubota wastewater treatment plants, which have achieved 90% or higher BOD removal rate, deliver excellent treated water quality with BOD of 20 mg/l or less (in case influent BOD is 200 mg/l). Their compact body fits any installation place while providing powerful treatment performance comparable to a sewage system. 

Note for use

Service and maintenance are very important for wastewater treatment plants.

Wastewater treatment plants use microorganisms to perform treatment.

Therefore, maintaining an optimum environment where microorganisms can be most active is essential.

KUBOTA JOHKASOU

KZ Type (1m3/day to 2m3/day)

Another phase in the space-saving installation process. The tank itself is the world's smallest design. It can be built without having to choose a place, and it will save labor and speed up construction even with a small excavation site.

・All-in-one air-piping unit blower without timer. 

How it works

Section Plan

Specifications (inf. BOD 200 mg/L)

HCZ Type (4m3/day – 10m3/day)

  • Compact design helps reduce excavation and construction cost.
  • Easy install with one blower pipe.
  • Having ability of removing BOD and nitrogen.
  • The inner structure is simple for fewer problems and less maintenance needed.

How it works

Section Plan

Specifications (inf. BOD 200 mg/L)

Membrane Bioreactor System

 

 Removal of T-N, T-P

Since it processes highconcentration activated sludge, it is easily possible to remove not only organic pollution such as BOD, but also nitrogen. Phosphorus can be removed through direct coagulant dosing into the nitrification tank.

 

Compact installation space

Since it processes highconcentration activated sludge, no sedimentation tank or sludge thickening tank is required. Installation space can be designed 30〜60% smaller compared with conventional

 

Reusable treated water

Since treated water is discharged through small membrane pores (0.4 μm), treated water is stable and with high quality effluent. Most microorganisms cannot pass through the membrane, so treated water can be reused without the high-treatment facilities. 

KUBOTA Submerged Membrane Unit

The KUBOTA Submerged Membrane Unit ® incorporates microporous membranes made from polyolefin. Although fluids which are smaller than the membrane’s microspores can permeate the membrane, contaminated ingredients cannot permeate it due to their larger sizes. Furthermore, contaminants are pulled to the membrane surface. Water flow created by aeration, and air bubbles contact the membrane’s surface and move upward while vibrating the surface. This keeps the membrane surface always clean and prevents the microspores from clogging.

Moving Bed Carrier Filter Method

The Moving Bed Carrier Filter Method is a wastewater treatment method that uses aerobic microorganisms adsorbed on medium within an aeration tank to eliminate pollutants in wastewater. Blowing air into the aeration tank to provide oxygen to microorganisms adsorbing in the media and therefore ensuring good contact between wastewater and media, resulting in high-efficiency treatment. Each medium has something to offer.

The moving bed tank employs a hollow cylindrical media that is highly capable of retaining microorganism.

The carrier filter tank employs a hollow cylindrical media with smooth surface to perform easier backwash process

Moreover, we have been applied high performance sponge media in some of our latest models. Sponge media, which retain more microorganisms than the conventional type with larger surface area in the same unit of capacity, provide high-rate nitrification process. Additionally, as being made from abrasion resistant material, the media has longer durability.

Deliver more compact aeration tank comparing to another treatment process using contact media

The specific surface area of moving bed tank in Kubota Wastewater treatment plant (Johkasou) is 7 times larger than fixed bed type. Therefore, the system provides higher BOD capacity load and delivers excellent treatment performance in compact size with cheap construction cost and low footprint. Besides, performance of nitrification process could become higher just by simply increasing amount of media

What’s happening in KUBOTA

Kubota's environmental friendly wastewater treatment plants

Kubota wastewater treatment plants, which have achieved 90% or higher BOD removal rate, deliver excellent treated water quality with BOD of 20 mg/l or less (in case influent BOD is 200 mg/l). Their compact body fits any installation place while providing powerful treatment performance comparable to a sewage system.

Typical BOD of household wastewater per person per day is 40g. Kubota wastewater treatment plant can reduce BOD to less than ten times (only 4g or less), with its excellent BOD removal rate of 90% or higher. On the other hand, Septic Tank removes only approximately 50% of BOD. Therefore, we strongly recommend you our wastewater treatment plants for aquatic conservation of rivers, oceans, and lakes.

* BOD (Biochemical Oxygen Demand)

An indicator of contamination of water expressed in the unit of mg/l. It is the amount of dissolved oxygen needed by biological organisms to decompose contamination of water. More oxygen is needed and BOD becomes higher if water is polluted more (containing more organic substances). BOD becomes low if water is clean.

Notes before using

Service and maintenance are very important for wastewater treatment plants. Wastewater treatment plants use microorganisms to perform treatment. Therefore, maintaining an optimum environment where microorganisms can be most active is essential. Service and maintenance include maintenance and inspection work, and desludging work.

When Installing,

Maintenance and inspection of a treatment tank include inspection and repair of the equipment and supply of chemicals. These works require special knowledge, and therefore making an outsourcing contract with a company who received our training is recommended.

  ・For desludging, please ask a company designated by your local government.

Usually only local government or companies designated by a local government can remove and clean sludge accumulated in wastewater treatment plants. For details, please contact your local government.

Before Use,

It is also very important to use wastewater treatment plant (Johkasou) in a right way every day to maintain its treatment performance. Below are some notes for our end-users in their daily usage of wastewater treatment plant (Johkasou).

1. Only domestic wastewater is acceptable

Basically, wastewater treatment plant can treat household wastewater only. Do not let rain or industrial wastewater flow into it. *Notes: However, depending on kinds of products manufactured, in some cases special designed wastewater treatment plant (Johkasou) can treat even industrial wastewater. Please contact us for more details. 

2. Keep blower running

Do not turn off the blower. Stopping supply of air into the tank will cause microorganisms to die, resulting in untreated wastewater and bad odor

3. What you should not throw in

Do not throw foreign objects (such as rubber and absorbent cotton) in toilet. This will cause clogged pipes and tanks, and lower the treatment performance. In kitchen, do not throw food wastewater and cooking oil into drains. 

 

4. Use water-soluble toilet paper

Use easily soluble toilet paper. Also, flushing down a large amount of paper will lead to more frequent cleaning of the tank. Therefore, using an appropriate amount is recommended.

5. No chemicals

Do not add chemicals (hydrochloric acid, insecticide, deodorant, chlorine agent, etc.) into the tank. Mixing various chemicals will cause microorganisms in the tank to die, resulting in untreated wastewater.

7. Don’t put anything near or on Johkasou and products concerned

Do not put any objects on the manhole, blower or power cable, or in the nearby area. Be sure to keep combustible or hazardous things away.

7-1. Always close the manhole cover. If the cover is not in place, close it completely for safety. Be sure to lock it if it has a locking mechanism.

 

7-2. If you find any abnormality (such as crack and breakage), replace the cover. Be extremely careful to prevent children from playing near the wastewater treatment plant.

 

7-3. When closing a cover with bolt nuts, tighten cap nuts evenly using a special opening/closing handle.

 

7-4. Be careful not to lose parts such as washers and gasket. Remove small stones and other foreign objects from the frame

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