There is no technical problem in passing the dirty water produced by tank washing through separators in order to remove the oil or treating it with chemicals before discharging it at sea, or even merely retaining it on board and then pumping it ashore into tanks at the oil loading ports without damaging the environment.
Akukho ngxaki kubuchule bokugqithisa amanzi amdaka akhutshwe luhlanjo lwetanki kwizinto ezohlukeneyo ukwenzela ukuba kususwe i-oli okanye isetyenziswe ngemichiza phambi kokuyikhuphela elwandle okanye ukuyigcina enqanaweni ibe iyimpompela kunxweme kumazibuko olayisho lwe-oli ngaphandle kokonakalisa indalo