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B$$n $$ang l$$m vi$$c t$$i m$$t nh$$ m$$y x$$ l$$ n$$c th$$i v$$c giao nhi$$m v$$ thi$$t k$$ m$$t l$$ ph$$n $$ng h$$ng lo$$t $$ lo$$i b$$ ch$$t $$ nhi$$m $"$ X $"$ kh$$i n$$c $$u v$$o$.$ Ch$$t $$ nhi$$m $"$ X $"$ tu$$n theo $$ng h$$c ph$$n $$ng b$$c nh$$t$.$ B$$n c$$n thi$$t k$$ l$$ ph$$n $$ng theo m$,$ bi$$t r$$ng n$$ng $$ ban $$u c$$a ch$$t $$ nhi$$m X$($CXO$)$ l$100$mg$/$L v$$ b$$n mu$$n $$t $$c n$$ng $$ cu$$i c$$ng l$5$mg$/$L sau $30$ ph$$t ph$$n $$ng$.1\mathrm{.}1$ R$$t ra ph$$ng tr$$nh ph$$n $$ng m$$ b$$c nh$$t$.1\mathrm{.}2$ T$$nh to$$n th$$ t$$ch l$$ ph$$n $$ng c$$n thi$$t$.(8)1\mathrm{.}3$So s$$nh l$$ ph$$n $$ng theo m$$ v$$i l$$ ph$$n $$ng b$$ b$$c thang li$$n t$$c $(6)$