Growing Healthier Tomato Plants
Silk’s superpowers
Springing forward
Poison Dart Frogs
Salamanders and Newts
Life on the Down Low
Insect Stowaways
The Secret Lives of Grizzlies
Training Your Brain to Feel Less Pain
Swedish Rhapsody
Double take
Chemistry and Materials
Hitting the redo button on evolution
Butterfly Wings and Waterproof Coats
A Diamond Polish for Ancient Tools
Earth from the inside out
The science of disappearing
Programming with Alice
Dinosaurs and Fossils
Tiny Pterodactyl
Fossil Fly from Antarctica
Fingerprinting Fossils
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Earth from the inside out
Groundwater and the Water Cycle
Ancient Heights
Fungus Hunt
The Birds are Falling
City Trees Beat Country Trees
Finding the Past
A Long Trek to Asia
Early Maya Writing
The Puzzle of Ancient Mariners
Food and Nutrition
Making good, brown fat
Food for Life
Sponges' secret weapon
GSAT English Rules
Finding Subjects and Verbs
Adjectives and Adverbs
Capitalization Rules
GSAT Exam Preparation Jamaica
Preparing for the GSAT Exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
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GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Scholarship
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GSAT Mathematics
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Losing with Heads or Tails
Math Naturals
Human Body
Gut Microbes and Weight
Heart Revival
Speedy Gene Gives Runners a Boost
African Jackal
Tasmanian Devil
Asian Elephants
Choosing a Preschool: What to Consider
What Not to Say to Emerging Readers
How children learn
Black Hole Journey
Powering Ball Lightning
The Pressure of Scuba Diving
Plants Travel Wind Highways
Springing forward
White fuzzy mold not as friendly as it looks
Snapping Turtles
Space and Astronomy
A Planet's Slim-Fast Plan
World of Three Suns
Witnessing a Rare Venus Eclipse
Technology and Engineering
Reach for the Sky
Musclebots Take Some Steps
Are Propellers Fin-ished?
The Parts of Speech
What is a Noun
Countable and Uncountable Nouns
What is a Preposition?
Where rivers run uphill
Robots on a Rocky Road
Morphing a Wing to Save Fuel
The Best Defense Is a Good Snow Fence
Where rivers run uphill
Earth's Poles in Peril
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Eating Up Foul Sewage Smells

The smell of rotten eggs that wafts out of wastewater drains and treatment plants is an unwelcome visitor anywhere. In order to meet required standards of air quality, sewage-treatment plants use toxic and expensive chemicals to fight the stench. Now, researchers say they've found a better, cheaper, more natural way to subdue foul sewage smells. The secret? Bacteria and water. The horrible rotten-egg smell of sewage is caused by a gas called hydrogen sulfide. To get rid of it, most treatment plants use devices called chemical scrubbers, which filter the gas through a cocktail of dangerous chemicals. Chemical scrubbers work, but they are expensive and often dangerous. Two researchers tried something different. In a sewage treatment plant in California, they replaced chemical scrubbers with bacteria that break down hydrogen sulfide. The scientists loaded a container with little foam blocks full of the bacteria. Then, they pumped hydrogen gas through the chamber. Finally, they let water constantly trickle over the foam. The system worked so well that the California plant converted several chemical scrubbers to the new kind. If the technique catches on, sewage rot might become equally kind to the earth and to your nose.—E. Sohn

Eating Up Foul Sewage Smells
Eating Up Foul Sewage Smells

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