Due to an increase in discharge regulated areas for treated sewage (TS) and/or grey water (GW) according to port state requirements, as well as inadequate reception facilities at ports or dry-dock, it may become necessary to temporarily store TS/GW in ballast water tanks (BW tanks). Following discussions on detailed guidelines and requirements, MEPC 81 subsequently approved BWM.2/Circ.82, providing guidance for the temporary storage of treated sewage and/or greywater in ballast water tanks.

In relation to this circular (BWM.2/Circ.82), we would like to provide technical information for ship owners and relevant parties involved in the operation of ships.

* Summary of revision (Rev.1):
- Singapore: To be approved by RO
- Panama: To be submitted to PMA (no additional charges)