The invention provides an up-to-
standard treatment method for
wastewater containing
ammonia nitrogen and difficult-to-treat
copper-
cyanogen, and belongs to the field of
wastewater treatment.The
wastewater enters a first-stage oxidation reactor at first, the stable structure of a
copper-
cyanogen complex is destroyed by adding an
oxidizing agent, then a
copper removal agent and a pH adjusting agent are added into a copper removal reactor, copper ions are precipitated and separated out, and then the wastewater enters a second-stage oxidation reactor; the method comprises the following steps: carrying out oxidation and
solid-liquid separation to remove copper
sludge, carrying out oxidation and
solid-liquid separation on treated overflow liquid and press filtrate after convergence so as to thoroughly remove residual
cyanide and organic matters, and finally, conveying purified liquid which is subjected to two-stage oxidation and is subjected to copper
cyanide interference removal to a
biological reaction system to carry out biochemical reaction. And finally, the
effluent reaches the recycling or discharging standard. The method effectively solves the problem of
toxicity inhibition of difficult-to-treat wastewater on a biochemical
system, realizes step-by-step removal and
resource utilization of toxic and harmful substances, ensures stable and up-to-standard reuse or
discharge of
effluent, and has the advantages of efficient treatment, economy,
environmental protection and convenient operation.