수영강 하류의 노닐페놀 분포 및 물질수지에 관한 연구

Abstract

Nonylphenol(NP) is a degradation product of Nonylphenol ethoxylates(NPEs) which are widely used as industrial surfactants. NP is classified as an endocrine disrupter capable of interfering with the hormonal system of numerous organisms. In order to understand the behavior of NP in urban stream, this study was examined occurrence of NP in Suyeong river of Busan. The surface water were collected at 5 stations with water sampler at August and November, 2010, July, 2011. During the survey period, the concentration of NP in surface water of Suyeong river ranged from 142.0 to 569.0ng/L and average value is 271.0ng/L. The surface water of a swage treatment plant and Suspended particle samples of 7 stations were analyzed at July, 2011. The concentration of NP in Suyeong and Dong-bu STP effluence are 461.1ng/L and 527.3ng/L respectively, It were higher than river water. NP concentration in suspended particle were measured as 857.7∼5,193.2ng/L and generally showed a decreasing trend along down the river. Based on analyzed concentrations, mass balance was calculated to estimate the transport of NP in urban stream. State variables consisted of dissolved NP, NP in POC. Adsorption and Desorption of POC, settling to sediments are considered to chemical and biological processes. Discharge from river and STP are 107,720m3/day and 494,500m3/day respectively. Dissolved NP and NP in suspended particle of inflow mass into Box 1 were 282.3g/day and 1582.84g/day. Outflow into Box 2 were calculated that Dissolved NP is 192.5g/day and NP in suspended particle is 1250.0g/day. Adsorption from Dissolved NP to suspended particle had the highest value of 105.7g/day in Box 2 and desorption was occurred in Box 3. Settling to sediment had the highest value of 644.0g/day in Box 3. when the inflow mass into Box is 100%, outflow rate in dissolved NP were 68.2% in Box 1, 45.1% in Box 2 and 100% in Box 3. Adsorption rate in Box 1 and Box 2 were 31.8% and 54.9%, respectly, desorption rate of 8.8% was appeared in Box 3. The highest out flow rate in suspended particle was 86.3% in Box 2 and the highest settling rate is 55.0% in Box 3. Measured concentrations of NP in surface water are similar to those of other urban river in Korea and are lower than regulations in the U.S and Europe. But, NP was detected in all stations and level of NP in suspended particle are nearly the same as that of reported toxic levels, it might be potentially hazardous to organisms in the river. In order to protect biota from the environmental effect of NP and understand seasonal distribution and residual characteristic of NP in Suyeong river, sustainable management is required and further studies should be conducted.