This study estimated the emission characteristics of odorous volatiles organic compounds (VOCs) from major 7 emission facilities by industrial classification in Yeosu petrochemical industrial complex. This study investigated terminal emission facilities (Inlet and outlet) in the industrial plant area, the plant boundary area and Samil-dong which has many civil appeal for an offensive odor to grasp VOCs concentration in ambient air of the plant boundary area and civil appeal area from May, 2002 to December, 2004, besides. VOCs were sampled 6 L using silicocan canisters and toluene, xylene and styrene which are known as odorous VOCs were analyzed by cryogenic preconcentration system and GC/MS. The removal efficiency of emission facilities in the industrial plant area for odor showed 96.5% of wet scrubber, 89.5% of RTO and 86.0% of RCO. The concentration of odorous VOCs at the plant limits area in 2003 were higher than 2002. The reason was guessed that toluene of high concentration emitted from terminal emission facilities in the industrial plant area influenced on ambient air at the plant boundary area. The concentration of odorous VOCs in ambient air at Samil-dong were decreasing from 1995 to 2001, but the concentration of toluene sharply increased from 2002. The reason was presumed that VOCs emission increased due to expansion of Yeosu petrochemical industrial complex and removal efficiency of terminal emission facilities dropped due to outworn equipments for VOCs prevent.

Twenty organic chemical substances (Table 2) were isolated from untreated wastewater, as well as treated wastewater, collected at 76 companys of 9 industry group located in the basin of Youngsan River. Those organic compounds were analyzed by Gas Chromatography/Mass Spectrometry(GC/MS) and confirmed through comparison with each standard reagents. Phenol, which was not detected in the raw wastewater, was identified in the effluent of treatment facility, indicating that phenol is generated from isopropylbenzene of plant wastewater.