1. As per "MARPOL"73/78. 2. fuction: dosing disinfecting,sludge cutting,inner flushing This SWCH type Holding tank also ... can be a sewage comming and disinfecting system regulated by Annex IV of MARPOL 73/78, for ... treatment plant.The Holding tank has the function of dosing disinfecting,sludge cutting,inner flushing and discharging the rreated sludge to ...