Biogas Digester

Because magic was involved, reclaiming the wasteland was not difficult at all—

It was nothing more than a matter of setting a fire.

Molly Weasley used the Drying Charm to strip the wildly growing weeds and trees of their vivid green, leaving them yellowed and shriveled until they finally became clumps of dead grass and dry wood.

After that, things became much simpler. One Blazing Flames spell was enough to create a rich, fertile field.

"So, Tierra, what did you say this was for again?" While Molly Weasley—Mrs. Weasley—led the wizards and parents in reclaiming the wasteland, Arthur Weasley and Tierra stood before a huge metal cylinder, watching as it slowly sank into the pit Tierra and the others had just dug with magic under the combined force of several wizards' Levitation Charms.

"This is called a biogas digester," Tierra said. "It uses organic waste—um, feces and urine, oh, and food waste and so on—to produce biogas through fermentation."

"Fermentation? Producing biogas? What is that?" Arthur Weasley pressed on like an inquisitive child.

"Brewing alcohol is one kind of fermentation." Tierra tried to explain it to Arthur Weasley in the plainest, simplest terms.

"You mean we can turn feces, urine, and food scraps into fine wine!?" Arthur Weasley asked, both delighted and disgusted. "Muggles are geniuses. Can they do something like this without magic?"

"No! That's not it!" Tierra felt as though he were playing music to a cow. "What I mean is that fermentation is a natural phenomenon discovered by Muggles. Later, they learned to control and make use of it. When they ferment fruit, it becomes all kinds of fruit wine. Likewise, when they ferment feces, urine, and food scraps, they become a kind of gas and some residue."

"The gas is biogas. It can burn and can