Slaughterhouse waste is a biodegradable

Biodegradable waste

Biodegradable waste is a type of waste, typically originating from plant or animal sources, which may be degraded by other living organisms. Waste that cannot be broken down by other living organisms are called non-biodegradable....

 waste

Waste

Waste is unwanted or useless materials. In biology, waste is any of the many unwanted substances or toxins that are expelled from living organisms, metabolic waste; such as urea, sweat or feces. Litter is waste which has been disposed of improperly...

 with the following definition:
Animal body parts cut off in the preparation of carcasses for use as food. This waste can come from several sources, including slaughterhouse

Slaughterhouse

A slaughterhouse or abattoir is a facility where animals are killed for consumption as food products.Approximately 45-50% of the animal can be turned into edible products...

s, restaurant

Restaurant

A restaurant is an establishment which prepares and serves food and drink to customers in return for money. Meals are generally served and eaten on premises, but many restaurants also offer take-out and food delivery services...

s, stores and farm

Farm

A farm is an area of land, or, for aquaculture, lake, river or sea, including various structures, devoted primarily to the practice of producing and managing food , fibres and, increasingly, fuel. It is the basic production facility in food production. Farms may be owned and operated by a single...

s(source:OED).

Slaughterhouse wastes and regulations

In the UK, slaughterhouse waste is classed as category 3 risk waste in the Animal By-Products Regulations

Animal By-Products Regulations

The Animal By-Products Regulations allows for the treatment of some animal by-products in composting and biogas plants...

, with the exception of condemned meat which is classed as category 2 risk.

Abattoir is another word for Slaughterhouse.