Solid Waste Management

Disposal TechnologyDisposal Technology

Ahmed A.M. Abu Foul

Environmental Department

Islamic University of Gaza

What is waste?Waste = any unwanted item or substance resulting from a human activity or process

More consumption more waste!

– Municipal solid waste = from homes, institutions, small businesses

– Industrial solid waste = from production of consumer goods, mining, petroleum extraction, agriculture

– Hazardous waste = toxic, chemically reactive, flammable, or corrosive

– Wastewater = water used in homes, businesses, etc., and drained or flushed, plus runoff from streets

Why do we care about waste?

• Waste degrades water, soil, and air quality; does environmental and ecological harm

• Waste can do harm to human health

• Waste is a symptom of inefficiency; wastes resources

• Waste is unpleasant aesthetically

What do we throw away?

What do we throw away?

Solid Waste Disposal Methods• Open Dumps• Landfills .• Ocean Dumping (Many cities in the US continued ocean

dumping of municipal waste until 1988)• Compositing (Oil and meat products should not be put in

composite); Composting is a waste disposal method that vastly reduces total waste volumes.

• Incineration and Resources Recovery - Refuse-derived fuel has a higher energy content than raw refuse, but requires energy to sort before burning). - One of the sources of dangerous heavy metal emissions is from incinerating batteries

Where does our trash go?

Where does our trash go?

Open Dump

Landfills• In modern sanitary landfills, waste is buried or piled up so as

to avoid contamination of the environment.

• Site chosen carefully

• Bottom and sides lined with plastic and clay

• Groundwater monitored

• Collection system for leachate (liquid with dissolved contaminants from trash that leaks from landfill)

• Requirement to add trash and cover in optimal manner

Sanitary landfill

Old Landfill Problems

• Leachate generation• Methane production• Incomplete decomposition• Settling

Improving Landfills

• Located above water table and away from airports

• Contoured floor for leachate-collection system

• Covered with earthen material

• Groundwater monitoring wells

Composting

• Composting is the controlled biological decomposition to degrade organic matter

• Compost is used for fertilizer, topsoil, landfill cover, and in other ways

• The metabolic activity of the microorganisms can easily cause the temperature in the composting materials to rise to above 60 degree C

• The microorganisms also like a fairly high moisture content or about 40 to 50 percent water,

• The material should contain 15 to 18 percent oxygen and have a pH of 5.0 to 8.5

Small home compost bin

General design of a small composting bin for the home

Incineration

• Incineration recovers energy that would otherwise be lost

• Requires less land• Reduces odor but…• Emits dangerous

cancer causing compounds called dioxins

Does the Fume Contain Dioxins?

Waste-to-Energy

The three RsREDUCE• The best way for us to be more efficient and to decrease our

impact on natural resources is to consume less energy and materials.

• Reduce is the most often overlooked of the "three Rs"

REUSE• Using a refillable beverage container (returnable bottles)

would be an example of Reusing materials.

RECYCLE • Recycling, in terms of solid waste management, means

melting or shredding to make new products.• For example recycling aluminum is most important for saving

raw materials, saving energy, saving landfill space, reducing pollutants in the air and water

Waste reduction• Source reduction = preventing waste in the first place

• A- Personal/consumer behavior:• Use fewer items• Buy less-packaged and longer-lived goods• Reuse items• Compost

• B- Manufacturer behavior:• Make goods with less packaging• Make longer-lived goods• Adopt more-efficient production methods

Waste reuse

Recycling

Why do we recycle?

• Save money

• New businesses

• Reduce waste

• People feel satisfaction in recycling responsibly – • It makes us feel good! It’s simple!

Materials Recycled

• Aluminum• Paper• Plastics• Iron and other metals• Glass

Recycling rates

Waste management systems and their impacts on the

environment

ReuseReduce waste

Recycle

Incineration with energy

recovery

Open dumpLandfillIncineration without energy recovery

Maximum impact on the environment

Minimum impact on environment

THANK YOU!!!