European Waste Catalogue (EWC) Code 07 04 12 describes waste that as sludges from on-site effluent treatment other than those mentioned in 07 04 11 and is classed as a Mirror Non-hazardous code.
07 04 12
sludges from on-site effluent treatment other than those mentioned in 07 04 11
Some wastes are not automatically hazardous or non-hazardous - they are called mirror entry wastes.
These wastes have a hazardous waste entry (or entries) marked with an asterisk (*), and an alternative non-hazardous waste
entry (or entries) not marked with an asterisk
An EWC Code is a six-digit code used to identify waste as listed in the European Waste Catalogue. It is formatted as three pairs of numbers, for example 12 34 56. It identifies and classifies waste into categories according to how these wastes have been produced. It adequately describes the waste being transported, handled or treated.
It can also be referred as a LoW Code (List of Waste Code).
Read "What is an EWC Code?" from more information.