Besides human, all kinds of animals, plants and even minute organisms help purify wastewater. However, the amount of wastewater has enormously been increased recently,
 due to rapid growth of high-tech industries. Such an imbalance has resulted in seriousenvironmental pollution.

        To purify wastewater, organics exhaust oxygen, which is essential to aquatic animals and cause their death.

        According to Mr. Cheng, the latest method is to turn pollutants into energy essential to plant growth during wastewater purification done by certain kinds of plants or organisms.

        In one pond, we put in wastewater that’s used to wash things in school kitchen. It stays there for a couple of days to be purified before being used to water lawns on the campus. We’re still testing the ability of water hyacinth of wastewater purification.

        Thanks to Mr. Chia-wu Cheng, who has a master’s degree of environmental engineering, for his great knowledge about treatment of environmental pollutants.