Waste code: 7142
Suggested EWC codes: 165071 (Waste containing oil-based drilling mud) 160708 (Tank-cleaning waste) 161003 (Sludge from offshore slop treatment) 130899 (Drilling-related base oil)
Hazard class: Not subject to IMDG/ADR
Packing group: Not subject to IMDG/ADR
UN no.: Not subject to IMDG/ADR
Oil-based drilling fluid is delivered in tanks or in bulk by vessel.
The waste is separated into water and sludge phases. The water phase is treated at SAR's water treatment plant at Mongstad. The sludge phase enters the WOSS process, where it is separated into three fractions: oil, water and sludge. The oil is used for energy recovery, the water is treated in a water treatment plant and the sludge is treated in a new process (TCC) at SAR.
The requirements described in GOMO (Guidelines for Offshore Marine Operations) must accompany bulk shipments. Skips and other containers with lids must not be used without prior agreement with the waste receiving facility. This type of packaging is not completely leakproof, and transporting liquid waste in it may cause spills, environmental releases and increased handling costs.
Relevant information about the waste (e.g. origin, composition, analytical results, additives and pretreatment) must be included in the declaration.
Measurements including TOC and salt in the water phase will be carried out on receipt onshore.
The waste guide uses technical terms and codes to describe how different types of waste should be identified, classified, and handled. This makes it easier to find the correct waste fraction and comply with requirements for sorting, packaging, and delivery.