Enzymatic agent prepared from diamond wastewater and waste activated carbon as well as preparation method and application of enzymatic agent

The invention discloses an enzymatic agent prepared from diamond wastewater and waste activated carbon, which is prepared by taking the diamond wastewater as a raw material, adding cobalt salt and ferric salt into the diamond wastewater to regulate and control the mass ratio of Ni < 2 + > to Co2 to Fe < 3 + > in the diamond wastewater to be 5: 2: 9.5-11, adjusting the pH value to be 6.5-7.5, and then adding the waste activated carbon for reaction. The invention also discloses a preparation method of the enzymatic agent, which comprises the following steps: S1, adding cobalt salt and ferric salt into diamond wastewater, stirring and dissolving to obtain mixed wastewater; s2, adding into mixed wastewater, and adjusting the pH value to 6.5-7.5, so as to obtain a reactant; and S3, adding waste activated carbon into the reactant, and stirring for dissolving to obtain the enzymatic agent. The treatment cost and cost of the diamond wastewater and the waste activated carbon can be reduced, and the organic wastewater