Cost analysis of different hydrogen peroxide supply strategies in the solar photo-Fenton process

This paper deals with the cost assessment of different hydrogen peroxide addition strategies with the assistance of dissolved oxygen on-line monitoring as the controlled variable. In this way, manual, automatic and controlled hydrogen peroxide supplies were assayed. Although the application of the photo-Fenton process to remove persistent pollutants in wastewater is accepted, there are few studies linking existing scientific and economic knowledge to evaluate further improvements in the decontamination processes. This economic study relates total costs to water treatment capacity and mineralization for a 100 m2 CPC plant. Results showed that the amount of H2O2 added and the treatment time are decisive in cost reduction, dissolved oxygen monitoring being a key tool in predicting both variables. Furthermore, for low mineralization values, the addition strategy is not significant in financial terms, obtaining a mean cost of 0.53 €/m3 for 50–60% mineralization. However, for higher mineralization levels, the cost is quite sensitive to mineralization changes and, so, Proportional and Integral controlled hydrogen peroxide dosing would be a better option.

Photo-Fenton process at pilot plant scale to achieve approx. 80% Mineralization acetaminophen (50 mg/L initial DOC).Figure optionsDownload as PowerPoint slideHighlights
► A cost study of different H2O2 supply strategies in the photo-Fenton process is made.
► Dissolved oxygen on-line monitoring has proved essential for cost reduction.
► For low mineralization requirements, costs are not sensitive to the addition strategy.
► When mineralization levels are higher, a controlled dosage would be less costly.