(07.04 LC) Primary treatment of wastewater includes
adding chlorine to disinfect water before it is discharged
implementing UV light to disinfect large solids that float to the top
introducing bacteria to the sewage to break down inorganic matter
using large- and small-holed screens to remove coarse solids

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

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