Bioremediation
Bioremediation is using living things like bacteria or enzymes to clean up pollution.
A jar of greasy water sits on the counter. You drop in tiny beads that soak up the grease and break it down. The water turns clear as the beads do their work. The jar holds the same water, but the dirty stuff is gone.
Explaining bioremediation by grade level
Some tiny living things can eat grease and oil. You can not see them, but they do big work. They munch through the grease and break it into safe bits. The dirty water gets clean over time. Nature has its own clean-up crew.
Projects that explore bioremediation
A marine bacterium called Acinetobacter calcoaceticus RAG-1 uses hydrocarbons in oil as a carbon source — meaning it literally feeds on the pollution as it grows. This project shows that mechanism in action on a petroleum pollutant. You set up two test tubes with carbon-deficient growth media, inoculate both with RAG-1, then layer one with used motor oil and the other with fresh. As the bacteria multiply and consume the oil, the media grows cloudier. You track that cleanup every 24 hours with a spectrophotometer, graphing the relationship between bacterial growth and oil breakdown.
Enzymes can break down pollutants into less harmful substances — and this project tests which physical form does it fastest. You collect fat, oil, and grease (FOG) from a restaurant grease trap, then set up nine beakers with equal amounts of FOG and distilled water. Three beakers get liquid enzyme, three get powder, and three get solid. Each day you observe the beakers and record how long it takes for each form to decompose the grease. Comparing results across all three forms shows which biological agent remediates real-world FOG waste most effectively.