This study focused on evaluating the efficiency of the removal of non-point source pollution by Daecheong Lake Juwon Stream constructed wetlands. The constructed wetland system is a surface flow type designed in the year 2007 for purifying eutrophic water of Daecheong Lake Juwon Stream. The value of conductivity, suspended solids(SS), chemical oxygen demand using a potassium permanganate(CODMn), five-day biochemical oxygen demand(BOD5), total nitrogen(T-N), total phosphorous(T-P), and pH in inflow averaged 220.2, 2.46, 3.33, 1.34, 2.00, 0.04 mg/L and 7.24, respectively and in outflow averaged 227.9, 1.12, 3.34, 0.87, 1.16, 0.02 mg/L and 7.45, respectively. The average removal efficiency of constructed wetlands was 30 % for SS, 22 % for BOD5, 45 % for T-N and 31 % for T-P. The removal rates of SS, BOD5 and T-N in the spring, summer and autumn were higher than those in winter. The removal rate of T-P was not significant different in all seasons. The amounts of pollutants removal in the constructed wetlands were higher in the order of 3rd ‹ 2nd ‹ 1st wetland for SS and T-P, 2nd ‹ 3rd ‹ 1st wetland for BOD5 and T-N. Therefore, our findings suggest that the constructed wetlands could well treat the eutrophic Daecheong Lake Juwon Stream waters.

In this study, VOCs originating from vehicles were measured at 8 underground parking lots(two apartments, four department stores, and two large-scale marts) in Daejeon. The indoor air quality at underground parking lots of the department stores and marts was affected by the availability of the ventilation facility and their operation frequency. At the underground parking lots with a ventilation facility, the maximum VOCs concentration was 727㎍/㎥, and the minimum was 73.5㎍/㎥. The average concentration ratio of BTEX to TVOCs at the underground parking lots was almost constant, which was approximately 44.8%. TVOCs and BTEX were strongly correlated with a correlation coefficient (r) of 0.88. The relative ratio of benzene, toluene, ethylbenzene and xylene was 1 : 9.51 : 0.71 : 2.53, directly reflecting the influence of vehicles sources.

In this study, the paint, which has very close relationship to the of indoor air quality, was examined for the air pollution leveling test, and using the various passive sampler, the test was evaluated on the regard of TWA(Time Weighted Average). This study is to examine how the air pollution levels differ between the regular paint that is used for public and the new developed environment friendly paint. The consecutive experiments were performed in the small chamber test to investigate the VOCs and formaldehyde, ammonia emissions and characteristics from paint which are commonly used as the complete material of building. In conclustion, the natural paint showed the highest emission of VOCs among the selected paints, and water paint showed the highest contents of ammonia. Formaldehyde showed N.D(Not Detected) in most of tests and found a small amount in vinyl paint however, it was not as bad as to fail the certify level of building materials. It is recommended to constantly develop the chamber system and it will be very much possible to be used for the estimation of indoor air pollutants from the various paints and other complete materials.