Harry Potter and the Great Old Ones.

Chapter 733 Biogas Digester

Because of the addition of magic, clearing the wasteland was not very difficult.

It's just a matter of setting a fire.

Jasmine Weasley used a drying spell to strip the wildly growing weeds and trees on the wasteland of their vibrant green, turning them yellow and withered until they were nothing but clumps of dead grass and wood.

After that, things became much simpler. After casting a "Blazing Flames" spell, you could obtain a fertile field.

"So, Tierra, what were you saying this was for?" While Molly Weasley, also known as Mrs. Weasley, was leading the wizards and parents in clearing the wasteland, Arthur Weasley and Tierra were standing in front of a huge metal jar, watching as it slowly sank into the pit that Tierra and the others had just dug with magic, thanks to the combined effect of the levitation spell cast by several wizards.

“This is called a biogas digester,” Tierra said. “It’s a way to produce biogas by fermenting organic waste, well, that is, feces and urine, oh right, and food waste, etc.”

"Fermentation? Producing biogas? What are these things?" Arthur Weasley asked like a curious child.

“Brewing is a process of fermentation,” Tierra tried to explain to Arthur Weasley in the simplest and most straightforward language.

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

“No! No!” Tierra felt like she was talking to a brick wall. “What I mean is that fermentation is a natural phenomenon discovered by Muggles. They later mastered and utilized this phenomenon. They fermented fruit to make various kinds of fruit wine. Similarly, they fermented feces, urine, and food scraps to turn them into a gas and some residue.” “The gas is biogas, which can be burned and used for power generation or cooking. And the rest only needs a little processing to be used to make fertilizer.” Tierra spoke as if she were giving them a high school biology elective.

"Genius! Absolutely genius! How did those Muggles come up with that?" Arthur Weasley exclaimed.

“Is it possible,” Tyella sighed, “that because Muggles don’t have magic and can’t use the Vanish Charm, and then the excrement piles up there, stinking and rotting, forcing them to find a way to dispose of the excrement and turn it into something useful to them?”

"Oh, don't they use flush toilets?" Arthur Weasley asked, puzzled.

"Have you ever thought about what happens to the waste after the toilet flushes it away?" Tierra asked.

“Shouldn’t we just bury it in the ground?” Arthur Weasley asked. “Yes, why don’t we just bury the excrement and urine in the ground? Wouldn’t that fertilize our crops? There were a few times before when Jasmine told us not to use the Vanishing Charm to deal with the excrement, and that we had to bury it in the ground to fertilize the crops.”

“That would be too inefficient. The rotting of manure produces all sorts of harmful gases, which could be used as fuel,” Tiera explained patiently. “Secondly, it would lead to an excess of nutrients in the soil, which would stress crops… well, have a bad effect.”

"Oh, I see," Arthur Weasley said, suddenly realizing.

(End of this chapter)