This is the 18085th most frequent Korean word.
수원슬러지사업소에서
"At Suwon Sludge Facility."
The word 수원슬러지사업소에서 is acting as the topic marked by 에서, indicating the place where the action is taking place.
수원슬러지사업소에서 환경 보호를 위한 새로운 기술을 개발하고 있습니다.
At the Suwon Sludge Plant, new technologies for environmental protection are being developed.
Here, 수원슬러지사업소에서 specifies the location where the friend's work takes place.
수원슬러지사업소에서 일하는 친구를 방문했어요.
I visited a friend who works at the Suwon Sludge Plant.
This usage highlights the origin of the sludge production with 수원슬러지사업소에서 which is further explained in the sentence.