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Abstract
Rapid assessment of toxicity of chlorinated aqueous solution by dissolved oxygen depletion and optical density bioassays
Highlights
Chlorination is widely used for disinfection of water and wastewater around the world
They reported that the EC50 for chloroform on Dafnia magna was equel to 573.01 ppm [24], indicating that chloroform was more toxic for consortium of D. magna, and dissolved oxygen depletion (DOD) method is sensitive enough to measure the toxicity of chloroform
In the present study, the toxicity of chloroform as an indicator of THMs was assessed by DOD and optical density (OD) as the rapid and user-friendly toxicity bioassays
Summary
Chlorination is widely used for disinfection of water and wastewater around the world. Chlorination of wastewater effluent with high levels of residual organic matter has been suspected to the production of toxic and hazardous disinfection by-products (DBPs) including trihalomethane (THM) compounds. Methods: In this study, two rapid techniques including dissolved oxygen depletion (DOD) and optical density (OD) bioassays were used to evaluate the chloroform toxicity of aqueous solution. Results: It was revealed that the application of chloroform at concentrations of 100 and 1000 μg/L showed moderate and extreme toxicity, respectively, and reduced bacterial activity. Conclusion: According to the results, the wastewater effluent should use bioassays in order to evaluate the effects of DBPs where the wastewater effluent is disinfected by chlorine compounds. Rapid assessment of toxicity of chlorinated aqueous solution by dissolved oxygen depletion and optical density bioassays.
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