A new paper production technique has been developed to reduce the industry’s reliance on wood by turning cow and elephant dung into paper.
Traditionally, paper production involves the chemical and mechanical breakdown of raw wood into pulp that can be turned into paper products, and it’s usually an energy intensive process.
As researchers explained on Wednesday at the annual national meeting of the American Chemical Society in New Orleans, animals can save the paper industry energy by performing the breakdown functions themselves.
“Animals eat low-grade biomass containing cellulose, chew it and expose it to enzymes and acid in their stomach, and then produce manure,” Alexander Bismarck, a professor of advanced materials at the University of Vienna, said in a news release. “Depending on the animal, up to 40 percent of that manure is cellulose, which is then easily accessible.”
In Africa, sanctuaries, reservations and national parks host thousands of elephants. Dung is available in massive quantities. The same goes for cattle ranches in Europe and North America.
A sodium hydroxide solution treatment helps separate lignin and impurities, including dead cells, from the cellulose. The separated cellulose is then bleached with sodium hypochlorite. No additional processes are needed to break down the celluloses before its entry into traditional paper production methods. The digestion process inside the guts of cows and elephants works to grind the cellulose into nanofibers.
“You need a lot of energy to grind wood down to make nanocellulose,” said postdoctoral researcher Andreas Mautner. “You can reduce the number of steps you need to perform, simply because the animal already chewed the plant and attacked it with acid and enzymes. You inexpensively produce a nanocellulose that has the same or even better properties than nanocellulose from wood, with lower energy and chemical consumption.”
The nanopaper produced by processing animal dung could be used to make a variety of products, including wastewater filtering systems.
Scientists are currently exploring the possibility of combing their nanocellulose derivation process with other technologies that turn animal manure into sources of fuel.