Application of Catalytic Wet Peroxide Oxidation for Industrial and Urban Wastewater Treatment: A Review

Abstract

Catalytic wet peroxide oxidation (CWPO) is emerging as an advanced oxidation process (AOP) of significant promise, which is mainly due to its efficiency for the decomposition of recalcitrant organic compounds in industrial and urban wastewaters and relatively low operating costs. In current study, we have systemised and critically discussed the feasibility of CWPO for industrial and urban wastewater treatment. More specifically, types of catalysts the effect of pH, temperature, and hydrogen peroxide concentrations on the efficiency of CWPO were taken into consideration. The operating and maintenance costs of CWPO applied to wastewater treatment and toxicity assessment were also discussed. Knowledge gaps were identified and summarised. The main conclusions of this work are: (i) catalyst leaching and deactivation is one of the main problematic issues; (ii) majority of studies were performed in semi-batch and batch reactors, while continuous fixed bed reactors were not extensively studied for treatment of real wastewaters; (iii) toxicity of wastewaters treated by CWPO is of key importance for possible application, however it was not studied thoroughly; and, (iv) CWPO can be regarded as economically viable for wastewater treatment, especially when conducted at ambient temperature and natural pH of wastewater.

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

“…On the other hand, the removal of TN in the NAP-HW sample was only about 5%, while for NAP-SW and NAP-WWTP matrices it was slightly higher, at 20% and 30%, respectively (Figure 10b). From the obtained results, it could be concluded that the organic matter present in the HW and WWTP samples can act as a scavenger of • OH radicals in the CWPO reaction [47].…”

“…So, it could be suggested that the extra recalcitrant organic matter attributed to the micropollutant had a detrimental effect on the degradation of the aromatic compounds, if the dose of H 2 O 2 in excess referred to the stoichiometric amount. So, it could be concluded that the more recalcitrant or complex organic matter consumes an important amount of H 2 O 2 in the CWPO reaction before the removal of the more readily degradable organic matter occurs [47].…”

Simulation and Optimization of the CWPO Process by Combination of Aspen Plus and 6-Factor Doehlert Matrix: Towards Autothermal Operation

“…The recent development of structured catalysts/reactors using monolith [21][22][23] or structured cellular foams [24,25] has circumvented the barrier to scaling up. Besides, a variety of agro-food effluents i.e., from coffee [26], olive oil mills [27][28][29] and wineries [30], and industrial effluents, i.e., from textile [31], pharmaceutical [32], cosmetic [33] and chemical production [34][35][36], have been suitable treated by this technology. More recently, it has also been demonstrated to be a feasible technique to reduce the impact of residual contaminants, such as persistent endocrine-disrupting chemicals [36], present in very low concentrations in urban wastewater, or antibiotics and other pharmaceuticals in sanitary wastewater [37][38][39].…”

“…Despite the potential offered by CWPO, which can be exploited to treat industrial and domestic wastewater before or after a biological treatment within a wide range of pollutant loads [4,36] with a simple installation, since conventional atmospheric pressure reactors may be used, there are no commercial CWPO processes with solid catalysts. This work serves to help translate CWPO research into an industrial reality.…”

Editorial Catalysts: Special Issue on Trends in Catalytic Wet Peroxide Oxidation Processes

“…This special issue gives an overview of the state-of-the-art CWPO research for the treatment of industrial and urban wastewaters and how this process can be integrated into the water treatment process [1]. It is illustrated that the high versatility of this low-cost technology, thanks to the CWPO operational flexibility, is easily adaptable to any kind of wastewater, either polluted by high-loaded recalcitrant organics in industrial wastewaters or by emerging pollutants at micro-concentration levels in urban waters., This versatility also stands on the application of different types of solid catalysts, which can be tailored according to the process requirements.…”