Batch tests
Single solute test solutions of 2 mg/L acesulfame potassium
(C4H4KNO4S, 201.2 g/mol), 2 mg/L benzotriazole (C6H5N3, 119.1 g/
mol) or 2 mg/L diclofenac (C14H11Cl2NO2, 296.2 g/mol) and a solution
containing all three compounds (2 mg/L each) were prepared
with ultra-pure water. The comparatively high concentrations ofOMP were required for their Batch tests were conducted in glass flasks containing 50 mL test
solution. After addition of 1 mL (corresponding with 20 mg/L) of
the PAC stock suspensions with a micropipette, the flasks were
intensively agitated on a horizontal shaker. After 30 min contact
time the PAC was removed by filtration (0.45 lm pore size).
Contact times of 30 min are economically feasible for advanced
wastewater treatment [4] and thus appropriate for a test method,
although equilibrium is not reached [.