Decolourisation of secondary-treated effluent by advanced oxidation processes (AOPs)

Puspita, P 2012, Decolourisation of secondary-treated effluent by advanced oxidation processes (AOPs), Doctor of Philosophy (PhD), Civil, Environmental and Chemical Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Decolourisation of secondary-treated effluent by advanced oxidation processes (AOPs)
Author(s) Puspita, P
Year 2012
Abstract This research explored the application of Advanced Oxidation Processes (AOPs) involving UV irradiation, ozone and hydrogen peroxide in various combinations and concentrations for the removal of colour from secondary-treated effluent which was sourced from a local wastewater treatment plant for the purpose of increasing the potential of its recycling. The impact of these processes on the subsequent properties of the water was also studied.

The findings indicated that UV- and ozone-based processes have the potential to be employed as an advanced treatment of secondary-treated effluent, particularly for the removal of colour. While ozonation is clearly superior in terms of decolourisation and lower energy requirement, UV/H2O2 resulted in greater mineralisation although it requires the addition of chemical. In general, these treatments generated lower molecular weight by-products that are more biodegradable than the parent compound, indicating that integration with a downstream biological unit would enhance the effectiveness for overall treatment while at the same time reducing the energy requirement. When sequential ozone and UV/H2O2 treatment was applied, although there was no improvement observed for colour removal, a synergistic effect was observed in terms of DOC, COD and A254 reductions.

Investigation of the kinetics of these processes revealed that first order and parallel first order kinetics can be used to model the loss of colour, A254, DOC, fluorescent humic and fulvic acid-like matter. Preliminary study of the effect of these processes on the formation of nitrogenous DBPs (nitrosamines and haloacetonitriles) suggested that these processes have the potential to reduce the formation of the hazardous N-DBPs.

The substantial increase in the biodegradability of the treated effluent implies that these processes should not be used as a standalone treatment, but rather as a pre-treatment to convert non-biodegradable organics to biodegradable compounds. Hence, integration with biological treatment would be beneficial due to its ability to further remove the oxidation byproducts which were otherwise refractory, its low operating and capital cost, and capacity to reduce the concentration of harmful disinfection by-products.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Civil, Environmental and Chemical Engineering
Keyword(s) Secondary effluent
Advanced Oxidation Processes
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Created: Mon, 10 Dec 2012, 13:47:37 EST by Brett Fenton
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