Is Grey Water Green?

Overview

Objectives/Goals The objective of this experiment was to determine whether or not biodegradable and non-biodegradable grey water affect how herbs grow. Methods/Materials The method included growing three sets of 12 herb plants from seed. Each of the three sets was watered every other day for 22 days with either grey water made in a washing machine with biodegradable soap; grey water made in a washing machine with non-biodegradable soap; or freshwater (control group). Plant growth and pH was measured to determine the impact, if any, the two types of grey water had on plant growth and soil alkalinity. Results The herbs that grew the best were watered with non-biodegradable grey water and the herbs that grew the worst were watered with biodegradable grey water. The non-biodegradable grey water lowered the pH of the soil, creating a hospitable environment for the plants to grow, while the biodegradable grey water increased the pH of the soil and created a less hospitable environment for the plants to grow. Conclusions/Discussion The results of the experiment did not support my hypothesis. I expected that both biodegradable and non-biodegradable grey water would harm plant growth, with biodegradable grey water being less harmful than non-biodegradable grey water.

Competition history

• CSEF 2016 Toxicology · Entry J2110

Resources

• CSEF project summary ↗

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