For the soak time experiment, we want to analyze for 2 things:
|How many time can the adsorbent be reused?|
|And does it release arsenic back to the water over a period of time?|
Water hyacinth and duckweed were selected as the adsorbents for this experiment.
We prepared 300gr of water hyacinth, it's then soak and re-soak in four separate 1-liter water at 200ppb contamination level at various time. The results are as follow:
For water hyacinth, two quick conclusions can be drawn for this experiment:
|First, over a longer period of time, it does drastically reduce the arsenic contamination.|
|Second, it can be reused.|
However; the adsorption level is less each time. More tests are needed to further understand this experiment.
We prepared three 100ml samples of contaminated water. Each were separately soak with duckweed as the adsorbent at various time and the results are as follow:
The duckweed experiment results were the similar to water hyacinth. The adsorption level is phenomenal even with just a small amount of adsorbent. But again, more tests are needed to determine how much can it sustain.