Wastes are any unwanted or
discarded material from residential, commercial, industrial, or agricultural
activities that may cause environmental problems. Not necessarily pollutants.
Through recycling it might even possible to make it usable. Waste management is
a problem in both urban and rural areas in our country as elsewhere in the
world.
Waste
management is the collection,
transport,
processing
or disposal, managing and monitoring of waste materials. The goals of waste management are to
minimize waste quantity, reduce the amount of raw materials consumed, dispose
of non-hazardous waste cost-effectively, and dispose of hazardous waste with
minimal risk to human health and the environment.
How
Pollutants Enter the Environment
Hazardous-waste
pollutants from a solid-waste disposal site may enter the environment by as
many as six paths:
1.
Methane, ammonia, hydrogen sulfide, and nitrogen
gases may enter the atmosphere through emission
2. Heavy
metals, such as lead, chromium, and iron may be retained in the soil
3. Soluble
materials, such as chloride, nitrate, and sulfate may reach the groundwater
system through seepage and leakage
4. Overland
runoff may transport leachate into streams and rivers
5. Heavy
metals and other toxic materials may enter food chain via plant uptake growing
near the disposal site
6. Crop
residue containing toxic substances returns these to the soil after
decomposition.