The city worker killed in a freak raw sewage boat explosion on the Hudson River has been identified as a “beloved” veteran New York City Department of Environmental Protection engineer.

Raymond Feige, 59, died when the sludge vessel blew up at the North River Wastewater Resource Recovery Facility near 135th Street in Upper Manhattan on Saturday morning.

The blast threw Feige, a chief marine diesel engineer, into the water — trapping him between the boat and pier, authorities said.

It’s still not clear what caused the blast, and investigators are continuing to work the case.

“Ray was a respected engineer and a steady, beloved colleague who will be deeply missed,” DEP Commissioner Rohit T. Aggarwala said in a statement.

“For more than three decades he worked at DEP in a job that is largely unseen by most New Yorkers but is critical to keeping the city running, and we are grateful for service. Please continue to keep Ray’s family and colleagues in your thoughts during this difficult time.”

Meanwhile, two other DEP employees who were working on the vessel with Feige were rushed to nearby hospitals for treatment after Saturday’s blast, authorities said.

The boat, which was docked when the explosion ripped through its hull, had been hauling raw sewage from the city to treatment facility at the time.