Fuzzy algorithm of automatic control for dissolved oxygen(DO) concentration in the aeration tank of an activated sludge process is proposed. Among variables repirometry and air flowrate are selected as significant input factors and the relationship with DO is estimated using a multiple regression model. The DO concentration and the amount of repirometry are fuzzified and the fuzzy rule base are determined. Using the fuzzy algorithm, the change of amount of air flowrate are determined and the change of amount of DO is derived.

• 손건태(부산대학교 통계학과) | Keon Tae Sohn
• 김성덕(부산대학교 통계학과) | Sung Duk Kim
• 고주형(부산대학교 환경공학과) | Joo Hyung Ko