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The Institute of Nanotechnology of the University of Twente, the Netherlands, announced that the Netherlands' first salt-differential power plant, which was involved in the construction of the Netherlands in the northern part of the Netherlands, had already generated electricity by the end of November. This power plant was built in the northern part of the Netherlands to link the middle section of the Avludek Dam in North Holland and Friesland. Lake Esser in the southeast of the dam is an artificial freshwater lake, and its salt concentration in the Wadden Sea to the northwest is much higher. When the fresh water passes through the semi-permeable membrane installed in the power plant and meets the seawater, osmotic pressure will be generated, forming a freshwater flow potential that continuously flows into the seawater, thereby promoting the generation of electricity by the hydroelectric generator.
It is reported that this power plant can handle 220,000 liters of seawater and 220,000 liters of freshwater per hour. The power plant is equipped with a 400 square meter semi-permeable membrane and the power per square meter of semi-permeable membrane is 1.3 watts.
The power plant's salt difference energy technology program is provided by the Nano Research Institute of Twente University. Prof. Kitty N. Meyer, the technical director of the project, told Xinhua News Agency that the principle of salt difference power generation is not a new discovery, but related technologies have been inefficient and costly and have not been applied on a large scale. After eight years of research at the Institute of Nanotechnology at the University of Twente, the water mobility and resistance to contamination of semipermeable membranes have been improved, and this power generation technology has been put into trial application.
Niemeyer also pointed out that the current power generated by this power plant is still unable to meet its own demand for electricity, but its experimental prospects deserve attention. Salt difference power generation to achieve economic profit, the semi-permeable membrane power generation should reach 2 to 3 watts per square meter, semi-permeable membrane installation area should reach several million square meters.
She said that in the next five years, the Dutch Ministry of Economic Affairs, the government of Friesland and several partners promised to invest Euro 9 million in the operation and scientific research of this power plant. The total area of ​​installation of semi-permeable membranes in power plants is expected to increase substantially. Efforts will continue to improve the performance of semipermeable membranes.
Neimer believes that compared with solar energy and wind energy, salt-to-grain power generation is less subject to weather conditions, and the maritime country of the Netherlands should vigorously develop “blue energy†such as salt difference energy. She said that the salt-potential energy-generating potential of only the sea area where the Awludrake Dam is located can satisfy the electricity demand of 500,000 households.
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