... he sinh thai ho (qua trinh vat ly, sinh hoc, hoa hoc) - Qua trinh tao oxy + Khuech tan tii khdng va thiiy vuc; -t- Quang hgp ciia thue vat; -1- Cac phan ling tao oxy - Qud trinh tieu thii oxy ... phan tir (j=l tai day) Ea He sd khuech tan theo chieu thang diing k, He sd nhu cau oxy sinh hoa (1/ngay) k2 Tdc dp tai hoa tan oxy (1/ngay) k He sd nhu cau oxy ciia bun day (1/ngay) a.f,=a.j-a.j.i ... md ta bdi phuang trinh ^=K,,.a.{0,-0) dt Trong dd: Ko.a la he so chuyen khd'i oxy (h') O la ndng oxy tiic thdi; Os la oxy hoa tan Phuang trinh khuech tan tdng quat lien quan den DO cd dang: dt...