Gravity oxygen dissolver provides oxygen supply and wastewater purification at low costYasuhara Enviroment Technology Co., Ltd


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"DO-MAX Falls 150t" was set up at a shrimp farm in Vietnam for demonstration tests.

Product name = Gravity Oxygen Dissolver "DO-MAX"

Uses renewable energy to reduce electricity bills by up to 86%

Yasuhara Environment Technology's DO-MAX is a gravity oxygen dissolver that dissolves oxygen in water at low cost. In addition to supplying the oxygen required for aquaculture, it will also likely improve the performance of ultrasonic cleaning and wastewater purification equipment, and it is already being used in hydroponic plants and carp farms.

This product is based on insights from river engineering and coastal engineering within civil engineering, and applies the principle that oxygen dissolves in flowing river water and the seawater of waves breaking on the coast. In addition to gravity in nature, the centrifugal force and negative pressure difference are used to make water flow downwards to dissolve oxygen in the air into the water, increase the dissolved oxygen, and at the same time generate bubbles of about several millimeters.

The major advantage of this product is that it uses renewable energy and therefore has a strong cost advantage. Compared to conventional oxygen dissolution methods that rely solely on electricity, energy costs can be reduced by more than 50%, and in some cases electricity costs have been reduced by up to 86%. In addition, simplifying its basic structure makes it break down less than other types of oxygen dissolvers, reducing maintenance costs.

Has a proven track record in Japan and overseas, with applications expanding

The product has two primary models. One is DO-MAX (USW), which crushes bubbles with ultrasonic waves and furthermore saturates dissolved oxygen in water in a short time. The other is the simpler and less expensive DO-MAX Falls which does not emit ultrasonic waves.

It has already been adopted at carp farms in Japan and overseas. Its main purpose is to supply oxygen for carp to grow. Air bubbles are especially an obstacle in fry cultivation pools, so DO-MAX (USW) has gained a favorable reputation for crushing air bubbles.

In addition, the product is being introduced at many shrimp farms in Asian countries, and in Japan there have been orders from hydroponics plants.

Another ideal place to utilize the DO-MAX is in aeration tanks for wastewater purification equipment. Especially at small and medium-sized food manufacturers, if wastewater purification equipment deteriorates and its performance decreases, replacing existing oxygen supply equipment with this product will enable a significant reduction in power consumption.

It is also conceivable to use the product as part of an ultrasonic cleaner to supply gas (oxygen) to the cleaning liquid. The applications of ultrasonic cleaners that clean inside holes and uneven parts are wide-ranging and countless, including machined parts for engines, semiconductor wafers, mobile phones, medical instruments, LCD lenses, and glasses. However, there is a problem of the gas in the cleaning liquid naturally decreasing during cleaning, reducing the benefits from cleaning. Incorporating the product into that process can supplement gas (oxygen).

Proprietary product that will continue to shape water environments through industry-academia collaboration

DO-MAX was originally developed by the company for itself through industry-academia collaboration. To maximize the efficiency of the company's biotechnology business, which purifies water and other mediums using microorganisms, the company considered developing a gravity oxygen dissolver that utilizes renewable energy. Yasuhara asked for the support of Professor Shunji Ue from the Department of Civil Engineering and Architecture at National Institute of Technology, Tokuyama College who is knowledgeable about river engineering and coastal engineering. At present, the company is also working with Dr. Koichi Tsubogo (Doctor of Engineering) at Tsubogo Computational Research Institute to further improve the performance of its products. Yasuhara is conducting fluid analysis based verification experiments and evaluations on the product's oxygen dissolution.

There are high hopes for expanding DO-MAX functions, but Yasuhara is also focusing on other environmentally friendly products created with the proprietary ideas of a company that shapes water environments.

Coverage date August 8,2019


Company overview

Yasuhara Environment Technology Co.,Ltd

The company was established in 1968. A long track record in design, construction, and maintenance for public works such as water supply, septic tanks, and water treatment facilities. In 2007, in response to the shrinking size of public works, the Environmental Biotechnology Division was established with the aim of becoming a company specialized in water environments. Began sales of microbial water purifiers and oil-absorbing decomposers that decompose oil with microbes and eliminate the need for industrial disposal. In 2016, acquired the patent for DO-MAX in Japan, released DO-MAX (USW), and released DO-MAX Falls in 2017.

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