Question: what are different types of waste materials?
Answer: Liquid waste. Liquid waste refers to all grease, oil, sludges, wash water, waste detergents and dirty water that have been thrown away. ... 
Solid Waste. Solid waste is any garbage, sludge, and refuse found in industrial and commercial locations. ... 
Organic Waste. ... 
Recyclable Waste. ... 
Hazardous Waste.