+ 1 st period wednesday recycling nick d, analicia – teacher’s lounge shania, luisa –...

+1st period Wednesday recycling

Nick D, Analicia – Teacher’s lounge

Shania, Luisa – Tamar’s room

Noah, Sammy G – Odell’s room

Cecilia – Tess’s room

Uchenna – Nida’s room

John M – Ms. Summer’s room

Dean, Elliot – Ms. Becht’s room

Jessica, Omid – Mr. Hoope’s office

Trenton – Mr. Wilcox’s office

Morgan – Mr. O’Bryan’s room

Vishaal, Mook – Citlati’s office

Julie – Linda’s office

Chris – Tyler’s class

Joselyn T – Erin’s room (A)

+2nd period Wednesday Recycling

Jessica, Omid – Mr. Hoope’s office

Trenton – Mr. Wilcox’s office

Morgan – Mr. O’Bryan’s room

Vishaal, Mook – Citlati’s office

Julie – Linda’s office

Chris – Tyler’s class

Joselyn T – Erin’s room (B)

+

Hazardous Waste and Sanitary Landfills9/2/11

+What is an open dump landfill?

Open dump landfills are uncovered piles of solid waste.

They are more common in undeveloped countries.

+What are Sanitary Landfills?

Solid wastes are spread into thin layers, compacted and covered daily with fresh clay or plastic foam to prevent leachate.

+What are the Pros and Cons of Sanitary Landfill?

Low operating Costs

Can Handle Large amounts of waste.

Filled Land can be used for other purposes.

There limited landfill space in many areas.

Noise, traffic, dust

Greenhouse gases

Output approach that encourages waste reduction

Leachate – groundwater contamination

pros cons

+What is incineration?

Burning trash

+What are the pros and cons of Incineration?

Reduces trash volume

Produces energy

Concentrates hazardous substances for burial

Sale of E reduces cost

Expensive

Produces hazardous waste

Emits air pollutants

Encourages waste production

pros cons

+What is hazardous waste? Any substance that is:

FlammableReactive Toxic Corrosive

+How can we detoxify hazardous waste? Physical methods

Chemical methods

Nanomagnets

Biological – bioremediation and phytoremediation

Plasma Arch torch

+What are the physical methods for detoxifying hazardous waste? Charcoal resins to filter solids

Distilling liquid wastes to separate out harmful chemicals

+What are chemical methods to detoxify hazardous waste?

Chemical reactions (i.e. neutralization) to convert hazardous chemicals to less harmful chemicals.

+What are nanomagnets?

Magnetic particles coated with compounds to remove various pollutants from water.

+What is bioremediation?

Use of biological agents, such as bacteria or enzymes to destroy toxins or convert them to less hazardous waste.

+What is Phytoremediation?

The use of naturally or genetically engineered plants to absorb, filter or remove contaminates from soil and water.

+What does a plasma arch torch do?

Breaks down hazardous waste at very high temperatures.

+How can we store hazardous waste?

Deep well disposal

Surface impoundments

Above ground storage facilities

+What is deep well disposal?Hazardous wastes are pumped through a pipe full of dry, porous rock, where they soak into the rocks.

+What are the pros and cons of deep well disposal of Haz. Waste?

Safe at certain sites

Wastes can often be retrieved

Low cost

Leaks from corrosion of well casing

Emits air pollutants

Encourages waste production

pros cons

+What are surface impoundments?

Lined ponds, pits or lagoons in which liquid hazardous wastes are stored.

+What are the pros and cons of surface impoundments?

Low Costs

Waste can often be retrieved

Can store wastes indefinitely with secure double liners

Groundwater contamination from leakage liners and overflow

Air pollution from volatile organic compounds

Encourages waste production

pros cons

+FRQ check

Annual precipitation at a landfill in the town of fremont is 100 mm per year, and 50 percent of this water runs off the landfill without infiltrating the surface. The landfill has a surface of 5,000 m2 . Underneath the landfill, the town installed a leachate collection system that is 80 percent effective. Any leachate not collected by the system enters the surrounding soil and ground water. This leachate contains cadmium and other toxic materials.

Calculate the volume of water in cubic meters (m3) that infiltrates the landfill per year.

+100 mm/year = 0.1 m/year

0.1 m/year x 5,000 m2 x 50% = 250 m3

So the volume of leachate in a m3 that is treated per year is

250 m3 x 80% = 200 m 3

+Presentation Requirements

1) Everyone in the groups speaks

2) Name, Chemical structure of pollutant(s) and characteristics

3) Why is it “Hazardous”?

4)Summary of Case Study

5) Recommended management plan

6) Visual (ppt or poster)