| Title |
Evaluation of Ecotoxicity and Characteristics on Indirect Effluents and Related Wastewater |
| Authors |
김종민 ( Jongmin Kim ) ; 신기식 ( Kisik Shin ) ; 이수형 ( Soohyung Lee ) ; 이정서 ( Jungseo Lee ) ; 이택준 ( Taekjune Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.4.481 |
| Keywords |
D. magna; indirect effluents; permit limitations; test duration |
| Abstract |
This paper aims to evaluate the characteristics of direct and indirect effluents`toxicity level and difference between two test durations (24 h and 48 h) of test method. The proportion of the indirect effluent samples which exceeded the ecotoxicity permit limitations (TU 1 or TU 2) showed more than 2 times higher than that of direct effluent samples. However, effluenttoxicity of Wastewater Treatment Plants (WTPs) indicated less than TU 1 regardless of influent toxicity. From this results, treatment process was thought to have a good efficiency. WTP Salinity was very similar between influent and effluent. This trend could be reconfirmed by the component ratio of ion concentration between them and Na+, SO4 2-, Cl- ions which have a greater percentage than other ions. In addition, in case of high salinity, toxicity value also showed high level. To judge from above results, indirect effluents which were exempted from application of ecotoxicity standards, may need a new effluent limitations regardless of the treatment efficiency of WTP. According to circumstances, effective countermeasure may need torestrain the discharge of salinity-contained effluents which came from indirect-effluent factories. Test duration comparative study indicated that 48 h results were higher toxicity (exceeding rate of ecotoxicity criteria) than 24 h by the 5 to 5.4 percentage. 24 h test duration seemed to be useful in case of rapid detection, whereas 48 h test method could be applied for reinforcement of ecotoxicity regulatory system. |