Besides pollution and malodour, the slippery waste causes vehicles to skid
The court of Sylhet's Second Metropolitan Magistrate Farhana Yasmin granted the remand on Monday.
Investigator Jalalabad Police Station OC Alamgir Hossain moved the court for a week's remand on Sunday.
Residents of Badeali village, where Rajan's family lives, gave police a 12-hour ultimatum on Sunday night to catch all the killers.
Locals caught Alam and handed him over to police after the murder on July 8 when he was trying to take away the body in a microbus.
Jalalabad police later filed a case against Alam, his brother Kamrul Islam, Ali Haider, and Moyna Mia.