Ladan, Majed and Hamid visited the Lappeenranta wastewater plant on 29th June. Lappeenranta wastewater is treated mechanically, chemically, and biologically at four treatment plants. There are several processes in water treatment such as screening, sand sedimentation, coagulation (add ferrous sulfate), primary clarification, aeration, secondary clarification, and disinfection. Sampling was done from the raw effluent and the final treated wastewater. Also, to check the process efficiency in terms of contamination removal, 5 samples after each stage of the process were picked, and finally, they delivered wastewater samples to Mikkeli laboratory delivered to do experiments and analysis on them.