| Summary: | 碩士 === 國立交通大學 === 工學院碩士在職專班永續環境科技組 === 98 === In the semiconductor substrate process, stripping liquids use for washing unfinished surface. Ethylenediamine (C2H4N2) about 10% in the organic stripping liquids, is the main organic pollutant source in the wastewater of the industry. The decomposition by traditional acid process or physical oxidation and biological disposal are undesirable. This incomplete treatment of the wastewater will impact environment. The photo-degradation process i.e. a higher oxidative treatment, results in the rapid degradation of the target compound compared to other methods. It has been reported that hydroxyl radicals with great destruction power upon excitation of Fe (III) aqua complexes and UV irradiation were useful for the degradation and mineralization of complicated compound. Therefore, photochemical oxidation using Fenton’s reagent and UV irradiation has been considered as a promising technology for the treatment of organic stripping liquids, but higher running cost, and electrical energy demand. Biological treatment is still regarded for general common and economical way treatment of contaminants wastewater. The activate sludge process have demonstrated potentials to fundamentally advance the technology and practice of wastewater treatment. However, they have limitation in the degradation of recalcitrant substance such as the organic stripping liquids.
The results show, 50 mg/L Ethylenediamine solution, under the conditions at pH 3.0, Fe2+ concentration of 267 mg/L, Fe2+/H2O2 0.1 to 10, the reaction time is 1 hour to photo-Fenton process in the decomposition of Ethylenediamine The average TOC removal after about 7%; before and after photo-Fenton reaction, the NH3-N, NO2- and NO3- concentration did not change significantly.
In Fe2+/H2O2 is 0.75, the removal of 1% of the TOC produced by Ethylenediamine takes about 4.625 mg/L of H2O2 consumption. COD removal rate along with Fe2+/H2O2 ratio increases, in addition to H2O2 was 200mg/L, COD removal rate decreased, much of H2O2 showed possible competition effects added. And its average BOD5/COD ratio greater than 0.7, indicating photo-Fenton process can effectively enhance the biodegradability of Ethylenediamine.
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