특히 이들 중 312곳에는 악취 저감 효과가 뛰어난 공기공급장치를 설치토록 했고 정화조 관리자에 대한 교육도 실시했다.
In particular, 312 of them were required to install air supply systems that have excellent stench-reducing effects, and it also provided education to the managers of the septic tank.