Prompong Boriphan, head of the maintenance division of the Chiang Mai Irrigation Office, said only three per cent of the retrieved garbage were floats made of foam and the rest were degradable natural materials.
Prompong said officials have made panels to direct all the floated krathong to flow to the Ping Pa Daed watergate to make it convenient for workers to retrieve them from the river. He said officials started pulling out garbage from the river late on Wednesday morning.
The degradable garbage would be used to make compost while the foam garbage would be disposed of separately, he said.