Disposal


Disposal refers to the long-term placement of waste or treated waste. It is almost always off-site - away from where the waste is generated - and usually involves burial underground. Putting waste in storage containers at the site of generation is not a form of disposal. It is not a permanent solution. We classify disposal as the permanent resting place for the waste.

Waste does not have to be sterilized or disinfected before it goes to disposal. Landfills are not sterile.

Sanitary landfills

Sanitary landfills are a staple of the waste disposal system in the United States and many countries. The idea is that the waste will stay in the landfill until it has degraded and hence not harm the environment. The engineering of these landfills is well established now. Either a natural depression in the earth is used or a large hole is dug for the landfill site. The shape of the deposit discourages waste and leachate from migrating away from the landfill. A plastic liner or liners is placed on the ground before any waste is deposited; it provides "hydrogeological isolation," preventing uncontrolled migration of liquid leachate to the groundwater.

During operation of the landfill (which can go on for many years) waste is deposited in layers of a few feet in thickness, and soil from the local area is put on top of the waste layer. Then another layer of waste goes on top of the soil and another layer of soil on top of that. Different landfill designs employ different numbers of layers.Most sanitary landfills also have on-site staff, vertical vents to prevent build-up of off-gas, and monitoring of air emissions. We have another page on landfills for disposal of medical waste.

Recycling medical waste into compost or fertilizer

conpost synbolMunicipalities across the country have embraced recycling programs and some even have city-run composting services, which pick up compostable material from residences. Regulated medical waste (e.g. infectious or biohazardous waste) is not recycled or composted and there is no movement to start doing so. This type of waste is a small fraction of society’s overall waste stream and the protocols needed to ensure safety have not been developed and probably will not be developed. There is little economic reason to recycle or compost biohazardous waste.

However, the carcasses of dead animals are often disposed of by alkaline hydrolysis, and the result of that process can be used as fertilizer,

Also, large facilities like hospitals can and do institute compost collection programs for non-hazardous, non-regulated waste, such as waste from kitchens.

Procedures for disposing of dead animals.

Treatment of Pharmaceutical Waste