engleski

Advanced Oxidation Technologies for minimization of organic load in wastewaters

Water is an important natural resource for sustainable ecosystems, human life and economical development. Protection of clean aquifers requires a radical minimization of water consumption, total amount of wastewater and furthermore, minimization of wastewater loading. Wastewater management includes interdisciplinary and multidisciplinary approach and adjustment with increasingly more rigorous EU legislative. Chemical engineering has an important role concerning different methods of wastewater treatment, process design, mechanism investigations and process kinetics. Organic pollutants in wastewater present a specific problem due to their toxicity, bioaccumulation and poor biodegradability. The scope of this thesis is to investigate and identify the benefits offered by Advanced Oxidation Technologies (AOT) as destructive methods for treatment of wastewater loaded with different recalcitrant organic pollutants. Compared to classical approaches, AOTs are considered members of low and wasteless technologies for the treatment of wastewater with a minimal need for secondary treatment. The study was performed on model wastewater containing organic reactive dye C.I. Reactive Red 45 or p-chlorophenol as representative of organic chemical industry intermediates, respectively. Several Advanced Oxidation Processes (AOP-s) were studied: high voltage electrical discharge, UV based processes (UV, UV/H2O2, UV/O3, UV/H2O2/O3, UV/TiO2 and UV/ZnO) as well as Fenton type processes. Three types of gas/liquid high voltage pulsed corona reactors ; hybrid-series and hybrid-parallel and reference have been used to degrade organic dye in the presence and absence of synthetic zeolites. Optimal process conditions for the highest mineralization efficiency were determined on the basis of following ecological parameters: total organic carbon (TOC), adsorbable organic halides (AOX), chemical oxygen demand (COD) and biological oxygen demand (BOD5). Toxicity is one of the most important ecological parameters determining the level of water pollution. In this study, toxicity tests were performed on a zooplankton Daphnia magna in order to determine the final efficiency of the applied treatment. Mathematical models were developed for studies systems in order to better predict the behavior of real industrial wastewater systems containing organic pollutants.

oranic dyes; corona discharge; ozonation; advanced oxidation processes

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