Rice husk 

Rice husk is not strange to most of the agricultural countries. However, in such a context that many countries, including big powers, realize the importance of sustainable development, rice husk will surely become a very potential material applied to many technologies and manufacturing. Let me list some of the very beneficial usage of Rice husk.

1. Husk wood

Husk wood is sold at low-cost and much cheaper than coal, gas or oil. Burning husk wood also does little harm to environment. The ash – the left of husk after being burnt can be used as fertilizer. In Vietnam, husk wood has been put into use successfully. The typical example is Mr.Nguyen Huu Dung who made this kind of fuel widely popular to Vietnamese consumers. He shared that each day, his factory produces around 10 tons per day.

Source: http://dantri.com.vn/?/chang-trai-8x-tro-thanh-ty-phu-nho-k?

2. Paint against fire and bullets

It is difficult to believe that such small husk can be used to produce a very special kind of paint which is fireproof and bullet-proof. However, Vietnam succeeded in making this come true. This is an invention of Dr. Nguyen Thi Hoe who was given Science Award Kovalevskaya of Russia. The quality of this paint is higher than that of others sold in contemporary markets in the world while the price of this paint is cheaper and no ash or toxic gas is emitted when the paint is burnt.

Source: http://khoahoc.tv/viet-nam-san-xuat-son-chong-chay-chong-da?

3. Filtration machine

Mr. Luong Van De (1939), from Hai Duong, Vietnam, invented a filtration machine using filters? tubes made from husk. 
SiO2 will be separated from husk to produce high-quality porcelain which filters water then. The advantages of his machine are creating no side-effects because no chemical substances are added to water, and eliminating foul-smelling. The dioxin can be eliminated as well if the machine is connected with another filter having activated carbon tube. The filter speed is quite good and the price of this machine is reasonable.

Source: http://khoahoc.tv/thiet-bi-loc-nuoc-sach-tu-vo-trau-7482