By The Nation
The appointment was announced in the Royal Gazette on Monday.
Arkom succeeds Predee Daochai, who abruptly quit the post on September 2 after less than a month in office.
Arkom was previously transport minister under the post-coup Prayut Chan-o-cha government.
Before that, he was secretary-general of the National Economic and Social Development Board, a state think-tank which is now known as the National Economic and Social Development Council.