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Reduction of biocide-polluted wastewater by the oxidation processes O3 and H2O2/O3 [Elektronski vir]
Poberžnik, Mojca ...
The aim of this research work is the study and testing of various oxidation processes for refractory compounds decomposition for the purpose of reducing the concentration and toxicity of biocide ...wastewater from Slovene phytopharmaceutical factory. The experimental work was focused on the reduction of environmental load caused by toxic wastewater that originated from the production of isothiazolones, Kathon 886 F and Kathon LX. Lab scale experiments employing two AOP processes, ozonation (O3) and Peroxone (H2O2/O3), were applied to reduce the concentration of involved active components, methylisothiazolone (MI), chloromethylisothiazolone (CMI) and dichloromethylisothiazolone (DCMI). The reduction of biocide wastewater load for the performed oxidation processes was evaluated by the ecological parameters such as pH, COD, BOD, TOC, AOX and toxicity (Daphnia magna). The active isothiazolonesć components concentrations were measured via HPLC prior to and after the treatment. The H2O2/O3 oxidation procedure by O3 flow rate 1g/h, at pH value 10 and with the addition of 5 ml H2O2 (0,3 M) proved as the most effective treatment, where there was a significant removal of all the analyzed parameters: COD 91%, TOC 54% and AOX 98% according to the initial values. At the same time, the active isothiazolones' components were almost completely removed (99%). The toxicity of biocide-load wastewater with initial EC50 = 0.38%, decreased to EC50 (24h) > 100% and EC50 (48h) = 76%.
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