Japanese Engineers Tap Wastewater to Produce Clean Energy

A water treatment facility in Japan is exploring a novel form of renewable energy by tapping into the natural process of osmosis. This process, where water moves from a less concentrated solution to a more concentrated one, has long been understood. However, turning it into a reliable energy source has been challenging, mainly due to difficulties in developing effective membranes for the process. 

Over in the Fukuoka prefecture, engineers in collaboration with private partners believe they have made significant progress. They recently launched the second osmotic power plant in the world. The system generates electricity by using the interaction between treated wastewater and highly concentrated seawater, which is a byproduct of desalination. 

Osmosis is a familiar concept in everyday life, such as when salt causes water to be drawn out of vegetables. 

In this system, that same movement of water molecules is harnessed on a much larger scale. As water flows through semi-permeable membranes toward the saltier solution, it increases pressure and flow speed, which can then be used to spin a turbine and produce electricity. 

Fukuoka is particularly suited for this innovation because it already produces large amounts of concentrated brine from its desalination plant, which has been supplying drinking water since the early 2000s due to the region’s limited natural freshwater sources. Previously, this salty waste was diluted and discharged back into the ocean as alternative uses had not been successful. 

The new system connects a desalination plant with a nearby sewage treatment facility. It channels the salty brine and treated wastewater through multiple chambers separated by membranes. As water moves into the saltier solution, it builds pressure that drives a turbine, generating power before the diluted water is released into the sea. 

The project cost about 700 million yen ($4.38 million) and began operations towards the end of last year. 

At full capacity, it is expected to produce up to 880,000 kilowatt-hours every year, which is enough to power around 300 homes. For now, however, the electricity is used within the facility itself and covers only a small portion of its energy needs. Although still in its early stages, the technology shows promise. 

A five-year testing phase will assess performance, maintenance needs, and costs, particularly regarding the durability of membranes exposed to salt. Currently, the system is more expensive than traditional and other renewable energy sources, partly because it is a unique, first-of-its-kind installation. 

Despite these challenges, experts see potential. Unlike solar or wind energy, osmotic power does not depend on weather conditions. Developers also believe the technology could benefit regions with extensive desalination operations, such as parts of the Middle East. Ongoing research aims to adapt the system to work with regular seawater, potentially expanding its global use. 

Another form of clean energy that is gaining international attention is geologic hydrogen. Companies like MAX Power Mining Corp. (CSE: MAXX) (OTC: MAXXF) are spearheading the identification of deposits of this resource and could reap significant revenues once commercialization begins. 

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