title: Toxicity identification and reduction of wastewaters from a pigment manufacturing factory.
abstract: In this study, major toxicants in pigment wastewaters (i.e. raw wastewater and effluent) were determined by toxicity identification evaluations (TIEs), and changes in their toxicities due to combined gamma-ray (gamma-ray) and ozone treatments were evaluated. From TIE results using Daphnia magna, Cr(VI) and o-toluidine were identified as major toxicants in the raw wastewater with concentrations of 2.47 and 25.3mg l(-1), respectively. This was confirmed by subsequent spiking and mass balance approaches. For effluent, TIE results suggested that organic anions were likely responsible for the observed toxicities. Toxicity reduction tests showed that gamma-rays with ozone treatment after coagulation was more efficient in reducing toxicities in the raw wastewater (3.9-2.0 TU) than gamma-ray treatment alone (3.9-3.1 TU). For pigment effluent, gamma-ray/O3 treatment resulted in a complete removal of the acute toxicity.
authors: Division of Environmental Science and Ecological Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul 136-713, Republic of Korea.
authors: Hun-Je
authors: HJ
authors: Jo
authors: Eun-Joo
authors: EJ
authors: Park
authors: Kijong
authors: K
authors: Cho
authors: Eun-Hee
authors: EH
authors: Kim
authors: Jinho
authors: J
authors: Jung
mesh_terms: D000818:Animals; D002857:Chromium / Q000633:toxicity; D004396:Coloring Agents / Q000737:chemistry / Q000633:toxicity; D003621:Daphnia / Q000187:drug effects; D004784:Environmental Monitoring; D005720:Gamma Rays; D007220:Industrial Waste / Q000032:analysis* / Q000517:prevention & control; D010126:Ozone / Q000737:chemistry / Q000494:pharmacology; D014052:Toluidines / Q000633:toxicity; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects / Q000633:toxicity
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D014052:Toluidines; D014874:Water Pollutants, Chemical; D002857:Chromium; D010126:Ozone; C023622:2-toluidine