1. Present the results (30 marks)
· We often use tables to present data in a systematic way so that we can compare results more easily Calculate the turbidity removal (%) for two coagulants (Alum and FeCl3)
o Plot turbidity removal (%) against coagulant dosages (both Alum and FeCl3)
2. Analyze and discuss the experimental results (70 marks)
· When applicable, you may use graphs or charts to represent your results with explanation.
· Also, point out whether or not the results obtained can reach the aim of the investigation.
· Finally, draw a conclusion from the results obtained (for both Alum and FeCl3).
o Generally describe the data of your data
o Compare the pH values before and after coagulant dose and their effects
o Discuss the assumption of choosing the optimum dosage (from Table A and B in lab
manual) and compare two coagulants (Alum and FeCl3) Discuss the use and performance of two coagulants (Alum and FeCl3) in water and
sewage treatment. Discuss any possible errors of results and the corresponding improvement