Pollution feature and characteristic pollutants of bleaching effluent of southern hardwood chemical pulp were investigated by using the data obtained from conventional analysis

infrared(IR) and ultraviolet(UV) spectrum

gas chromatography(GC)- mass spectrometry(MS).It was found that in the effluent the concentration of dissolved organic compounds is high and its biodegradability bad

CODCr(dissolved chemical oxygen demand) and BOD5(dissolved biochemical oxygen demand) 1.5 kg·m-3 and 0.4 kg·m-3 respectively

and BOD5/CODCr 0.27.The data from IR and UV spectra indicates that the organic pollutant structures in the effluent contain benzene ring

carbonyls that are chromophore groups

and hydroxyls

ethers and carboxyls which are auxochromous groups.The deep color of effluent can be attributed to these compounds containing these groups as well as conjugation structures between carbonyl groups and C=C double bonds.An analysis for the data from of GC-MS shows that there are a large number of complicated organic pollutants in the effluent

including lipoid substances

phenols

alkanes and organic acids

aromatic compounds

and their relative peak area is up 58.16%.Based on photobacterium EC50 of the major organic compounds measured

the characteristic pollutants to be controlled for bleaching effluent of southern hardwood chemical pulp should include phenols

chlorophenols

organic chlorides and phthalates.