The organic content was high in the industrial waste water of a power plant

but the BOD5/COD(B/C)was low

so it had a poor effect to treat the waste water in biological treatment method.To promote the biodegradability of the refractory organics

the waste water was treated by ozone oxidation combined with biological active carbon(O3-BAC).Then the effects of ozone oxidation time

the pH value of raw water and the dosage of ozone in ozone oxidation test were researched

and the overall performance of O3-BAC was analyzed.The results showed that the ozone contract time was in 15 minutes

the pH value of raw water was in 8.0

the dosage of ozone was according to mass ratio of O3/TOC 3.0

which was the optimal technological condition.After ozone oxidation the B/C of raw water can be promoted to 0.21

and the removal efficiency of TOC was 33.95%

as well as the COD was 47.69%.In O3-BAC processes

when the water flow was in 0.60L/h

the average mass concentration of TOC was 11.30mg/L

the removal rate can be promoted to 70%

and the removal rate of COD can reach to 68%.Under different working condition

raw water was reduced to 87.08%.O3-BAC processes ran stably.