| Title |
Evaluation of Toxicity Influenced by Ion Imbalance in Wastewater |
| Authors |
신기식 ( Kisik Shin ) ; 김종민 ( Jongmin Kim ) ; 이수형 ( Soohyung Lee ) ; 이정서 ( Jungseo Lee ) ; 이택준 ( Taekjune Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.34.1.77 |
| Keywords |
Daphnia magna; Effluent; Ion imbalance; Salinity; Vibrio fischeri |
| Abstract |
This paper aims to evaluate the results of toxicity testing with Daphnia magna and Vibrio fischeri on wastewater samples which might be influenced by ion imbalance. The effluents from factories were found to be more toxic with high salinity levels than those from public wastewater treatment plant (WTP) and sewage treatment plant (SWP). Clion composition was highest in the effluent, in terms of percentage, which was followed by Na+, SO4 2- and Ca2+. K+ and Mg2+ ion was relatively low. The sensitivity of D. magna test results was higher than V. fischeri. Among samples which were proved by V. fischeri testing to be nontoxic, the composition ratio of each ion whether toxic samples or nontoxic samples which were decided by D. magna toxicity testing, were compared. Na+, K+, Ca2+, Mg2+ ion composition ratio showed high level in nontoxic samples whereas SO4 2- and Cl- ion composition ratio was high in toxic samples. Accordingly, SO4 2- and Cl- ion seemed to be considered the ions causing toxicity in effluent. Toxicity from some categories of industries (Mining of non-metallic minerals, Manufacture of basic organic petrochemicals, Manufacture of other basic organic chemicals, Manufacture of other chemical products etc.) seemed to be influenced by salinity. The Ion concentration in influent and effluent were similar. Concentration of Na+, Cl-, K+, Ca2+ ions were high in influent, however Mg2+ and SO4 2- ions were high in effluent. |