Seaweed contains high-density glucose, from which ethanol or materials such as biodegradable plastic, have been recently produced. A floatable block made from waste glass, that saves on labor and costs, has been developed to culture seaweed. The floatable block adhered grownup seaweeds would keep certain degree spacing as leaves of wood don’t overlap each other, and seaweeds in the sea of China had been overgrowing almost uniformly.
Seaweeds collect nutrients such as nitrogen and phosphorus from eutrophic areas during cultivation. The floatable block would be useful for multi-trophic aquaculture.
As the density of ethanol in the fermenting liquid is low originated from massive water contained in seaweed, the ethanol condensation should be energy saving using super-sonic mist separation method for example.
The material for the floatable block would be supplied from coal ash or incineration ash, and so on by separating rare earth metals and metals using a high-temperature melting furnace. Shortfall in phosphorus supply is feared in the near feature, thereby making it necessary to obtain it from deep sea water through the cultivation of seaweed.
As the exhaust gases from an ethanol-fueled car are more toxic than those from a conventionally fueled one, under low-temperature operation, catalyst activity would need to be assisted by electric discharge with a switching device, namely MOS-assisted gate triggered thyristor (MAGT), which achieves both high speed and high capacity.
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