The invention discloses process equipment containing polyethyleneglycol dimethyl ether and a method; in the method, first-stage distillation is carried out to high-concentration waste water containing NHD, and then second-stage distillation is carried out, and then distillate fraction after second-stage distillation enters in a product tank after being cooled, and the distillate fraction after first-stage distillation is carried out and low-concentration waste water containing NHD in the production flow carry out pulverized fuel ash adsorption in an adsorption tank; in the method, recovery processing is carried out to the high-concentration NHD waste water, and the low-concentration NHD waste water is discharged after reaching standards, so as to solve the problems of environmental pollution and resource waste owning to discharge of the waste water containing NHD, realize qualified discharge of sewage COD, avoid suppression of a biochemistry system, provide a solving way for realizingclean production of waste water in coal chemical industry and have a certain social benefit; meanwhile, the NHD solvent in the sewage can be recovered, and the cost for gas purification is saved.