International and EU rules breached on hazardous waste propel Sri Lanka to return waste loaded material back to its origin destinations.
Sri Lanka customs officials said hospital waste was discovered in many of the 263 containers imported by a private firm.
The shipment was meant to be made up of used mattresses, carpets and rugs for potential recycling.
Most of the containers have been stored in warehouses, with only a small amount of material having been re-exported.
Customs spokesman Sunil Jayaratne said the original importation breached international and EU rules and regulations on hazardous waste and its disposal.
England’s Environment Agency said it was committed to tackling illegal waste exports.
Several other countries in the region have recently begun to return waste imported from foreign countries.