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Animal Rendering

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Zdravka Marcheva

on 10 February 2014

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Transcript of Animal Rendering

Approximately 300 rendering facilities are in North America.
The United States currently produces, slaughters, and processes approximately 100 million hogs, 35 million cattle, and eight billion chickens annually.
What does animal rendering mean?
Animal Rendering
By Steven Villalobos

Continuous Rendering System
How Some Rendering Industry Products Are Used
Non-edible tallow
: Used in wax paper, crayons and soap
Oleic acid
: Used in foods, soaps, permanent wave solutions, shampoos, hair dyes, lipsticks, liquid make-ups, nasal sprays
: Used in inks, glues, solvents, antifreeze, cosmetics, foods, mouthwashes, toothpastes, soaps, ointments, plastics

To process (the carcass of an animal) in order to extract proteins, fats, and other usable parts.
Plants that operate in conjunction with animal slaughterhouses or poultry processing plants are called integrated rendering plants.
Types of Rendering Plants
Plants that collect their raw materials from a variety of off-site sources are called independent rendering plants.
Two Types of Rendering
- Edible rendering processes are basically meat processing operations that produce lard or edible tallow for use in food products.

- Materials that are used for aesthetic or sanitary reasons and are not suitable for human food.

The Process

Inedible Rendering
There are two processes for inedible rendering: the wet process and the dry process.
Wet rendering
is a process that separates fat from raw material by boiling in water.

Dry rendering
is a batch or continuous process that dehydrates raw material in order to release fat.
One-third to one-half of each animal produced for meat, milk, eggs, and fiber is not consumed by humans.
The most important and valuable use for these animal by-products is as
feed ingredients
for livestock,poultry, aquaculture, and companion animals.
Modern trends, such as pre-packed/table ready meat products, are increasing the raw material quantities for rendering.
The current volume of raw material generated in the United States is nearly 54 billion pounds annually with another 5 billion pounds generated in Canada.

Rendering has been carried out for many centuries, primarily for soap and candle making.
The earliest rendering was done in a kettle over an open fire.

The development of steam boilers made it possible to jacket the kettle to make a higher grade product and to reduce the danger of fire.
The steam "digester" which was simply a tank used as a pressure cooker in which live steam was injected into the material being rendered.

The pressure tank made possible the development of the Chicago meat industry.
It allowed the economic disposal of byproducts which would otherwise overwhelm the environment in that area.

Environmental Concerns
Wastewater Concern
Wastewater from rendering facilities contains the liquid that drains from uncooked raw material, including potentially pathogenic microorganisms.

Air Quality Concern

Odor emissions
Greenhouse gases
ammonia, particulates, nitrogen and sulfur oxides

Environmental regulations and requirements for operation of rendering facilities
Wastewater NPDES permitting for process wastewater discharges to streams
Local wastewater pretreatment and discharge permitting
Storm water NDPES permitting and reporting
Spill Prevention Control and Countermeasures plans and implementation
Land application permitting and reporting
Air emission permits and inventory reporting for Clean Air Act Title V regulations
Toxic chemical release reporting
Underground and above ground storage tank registration and reporting
Hazardous chemical inventory reporting
Emergency Planning and Community Right-to-Know regulations
Solid and hazardous waste disposal requirements

BSE ( bovine spongiform encephalopathy)
Is a progressive neurological disorder of cattle.
Epidemic in British cattle.
It had killed 166 people in the United Kingdom, and 44 elsewhere.

Stearic acid
: Used in rubber, cosmetics, lubricants, candles, hair spray, conditioners, deodorants, creams, food flavoring, pharmaceutical products
Linoleic acid
: Used in paints and esters
Meat meal and bone meal
: Used in livestock feed and pet food.

Hamiliton C.R., Meeker D., (2003). An Overview Of The Rendering Industry.
Retrieved from http://assets.nationalrenderers.org/essential_rendering_overview.pdf
Rendering (Animals). Retrieved January 15,2004 from http://en.wikipedia.org/wiki/Rendering_(animals)
Sindt G., (2010). Environmental Issues In The Rendering Industry.
Retrieved from http://assets.nationalrenderers.org/essential_rendering_overview.pdf
Waste Management Options. Retrieved January 15,2014 from
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