Substances: 1-3-Diphenylguanidine (InChiKey = OWRCNXZUPFZXOS-UHFFFAOYSA-N) Acesulfame (InChiKey = YGCFIWIQZPHFLU-UHFFFAOYSA-N) Atenolol (InChiKey = METKIMKYRPQLGS-UHFFFAOYSA-N) Systems: sewage system