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 (γ-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 25.3 mg 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 γ-rays with ozone treatment after coagulation was more efficient in reducing toxicities in the raw wastewater (3.9-2.0 TU) than γ-ray treatment alone (3.9-3.1 TU). For pigment effluent, γ-ray/O3 treatment resulted in a complete removal of the acute toxicity.
Original language | English |
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Pages (from-to) | 949-957 |
Number of pages | 9 |
Journal | Chemosphere |
Volume | 70 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2008 Jan |
Keywords
- Chromium
- Daphnia magna
- Gamma-rays
- TIE
- TRE
- o-Toluidine
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Chemistry(all)
- Pollution
- Health, Toxicology and Mutagenesis