Over a 207-day trial, the pH of the AMD rose successfully from 3.0 towards neutral and upward of 99 per cent of zinc particles (mg/l) were also removed from the AMD.
Look closely at the following data collected during the trial: pH
Temperature? 2 Calculate the average pH and Zn levels recorded over the course of the trial.
3 Calculate the percentage removal rate of Zn from the AMD solution for each day using the following equation: (A – ( B the table above.
4 Select a suitable chart or graph and plot the percentage removal rate of Zn against temperature over time. If possible, use a package such as Excel or GeoGebra to plot the data.
5 Comment on the trend in your chart or graph. Do you think the data supports the use of spent mushroom substrate as a viable option to treat AMD? Explain your answer.
6 In your opinion, what effect does the low temperature have on the ability of spent mushroom substrate to remove zinc from the AMD? Explain your answer.