Waste is unwanted materials and objects that people have thrown away. It is often also called trash, garbage, rubbish, or junk.

• It can be solid, liquid, or gas, or it can be waste heat.
• Garbage is the waste we produce daily in our homes, including old or unwanted food, chemical substances, paper, broken furniture, used containers, and other things.
• When waste is a liquid or gas, it can be called an emission. This is usually pollution (hurts plants and animals).

Biosolids, waste treatment, feces, manure, poo

emission – waste that is a liquid or gas

pollution – hurts plants and animals

Current estimates – biosolids produced worldwide per year

• 400 million tons. People
• 14 billion tons. Livestock. Mostly cows. Pigs. Chickens.

Problems, opportunities

• Nitrogen. Fertilizer. Phosphorous. Energy. Natural systems.
• Pathogens. Bacteria. Parasites. Livestock.
• energy recovery

Roman flush toilets.

Fish food.
Biodigestors.

Origin of feces. – Quirks and quarks podcast.

Ecosystems.

Waste management

Urban waste – humanure

Agricultural

• livestock – cows, pigs, chickens
• Fish poo

That’s engineering

• emission – waste that is a liquid or gas
• pollution – hurts plants and animals