Materials that are perceived to be a negative value.

The process of collecting and reprocessing a resource so it can be used again; usually includes the disposal of paper, cans and bottles.

Informally known as trash or garbage. Includes appliances and electronics.

The process of generating energy while reducing the volume and weight of waste; converts waste to energy.

Includes oils, human feces and household wastewater.

Primary, secondary and tertiary processes; the primary stage involves the settlement and removal of large materials.

Consists of pathological waste (such as tissue and organs), contaminated sharps and contaminated bedding.

The aerobic biological decomposition of organic materials to produce human-like-products.

Organica matter and residues of animal medication make up this type of waste.

The environmentally preferred strategy to reduce waste; two components are waste reduction and waste recycling.