An emergency treatment method for treating farm biogas slurry with low carbon to nitrogen ratio（c（C）/c（N）） was discussed. Potassium ferrate（K2 FeO4）

a green oxidant

was used to remove COD

NH

3

-N and TP from biogas slurry of pig farms. The removal experiments were carried out from three factors including dosage

pH value and temperature. The experiments results that the removal effect of K

2

FeO

4

on NH

3

-N was not obvious

but K

2

FeO

4

could quickly and effectively remove COD and TP in farm biogas slurry

and showed a positive dose correlation. A reaction system containing 1 200 mg/L K

2

FeO

4

was formed by adding 0.48 g potassium ferrate into 400 m L pig biogas slurry. After 120 min of reaction

the effluent COD and TP mass concentrations reached 146.0 mg/L and 11.2 mg/L

respectively

and the removal rates were 49.7% and58.7%. The acid system can further improve the removal efficiency. When the initial pH value was 3.0

the removal rates of COD and TP were increased to 92.1% and 85.6%

respectively

and the effluent mass concentration was 23.0 mg/L and 3.9 mg/L. And the low temperature condition is more conducive to the reaction. Therefore

K

2

FeO

4

could be considered as an emergency method for removing farm biogas slurry and applied research.