Treatment method and system for up-to-standard discharge of sulfur-containing gas field water

The invention discloses a sulfur-containing gas field water up-to-standard discharge treatment method and system.The sulfur-containing gas field water up-to-standard discharge treatment method comprises the steps that S1, sulfur-containing gas field water is subjected to steam stripping treatment; s2, adding sodium hypochlorite into the water subjected to steam stripping treatment for chemical oxidation; s3, carrying out chemical coagulation sedimentation pretreatment, wherein the chemical coagulation sedimentation pretreatment sequentially comprises softening reaction, coagulation flocculation and natural sedimentation; s4, sequentially carrying out sand filtration/activated carbon filtration and ultrafiltration treatment on the water subjected to chemical coagulation sedimentation pretreatment; and S5, respectively carrying out'nanofiltration + reverse osmosis + multi-effect evaporation 'or'nanofiltration + multi-effect evaporation + reverse osmosis' or'multi-effect evaporation + reverse osmosis' treatment