Hazardous waste is collected in special containers according to legal regulations (e.g. "Ordinance on Hazardous Substances"; and refer also to: "Legal Conditions for the Handling of Hazardous Substances" and "Technical Guidelines on Safety in Chemistry Laboratory Courses").
Waste of different types should not be mixed. Different special waste containers provided by the university should be used for waste collection. These containers must be returned to the waste repository, where the containers must not be more than 90% full (to avoid spillage during transport).
Containers must be tightly sealed and correctly labelled. Otherwise disposal companies are not authorised to accept them. Containers that are damaged, leaking, or contaminated with hazardous substances on the outside may also not be accepted.
The general rule for the handling of hazardous waste is to avoid any risk of endangering man and the environment during storage, transport and disposal of these materials.
Aqueous waste generated in Laboratories
Aqueous laboratory waste is any liquid that reaches the sink. Ideally it is only water. In daily practice, it usually consists of aqueous solutions that have been previously neutralised to a pH between 6 and 8 and do not contain heavy metals.
During the disposal of aqueous waste, limits generally set by municipal waste water by-laws must be observed. It must be observed that it is forbidden to dilute aqueous waste in order to comply with these limits.