Advanced treatment of industrial wastewater by ozonation with iron-based monolithic catalyst packing: From mechanism to application

• Published in: Water research (Oxford) Vol. 235; p. 119860
• Main Authors: An, Wenhui, Li, Xufang, Ma, Jieting, Ma, Luming
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.05.2023
• Subjects: Catalysis; Catalytic ozonation; Fe-based monolithic catalyst packing; Industrial wastewater advanced treatment; Iron - analysis; Ozone; Practical engineering operation; Reactor design; Wastewater; Water Pollutants, Chemical - analysis; Water Purification; Fe-based monolithic catalyst packing; Industrial wastewater advanced treatment; Reactor design; Catalytic ozonation; Practical engineering operation
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2023.119860

•Fe-based monolithic catalyst packing was proposed innovatively.•Low-cost monolithic catalyst packing exhibited stable and high catalytic activity.•Micro-channel structure played a key role in catalytic ozonation.•Theoretical derivation proved that O3/ΔCOD>2, COD removal improved was limited. An Fe-based catalyst was prepared by oxidising waste Fe shavings directly in a solution. In engineering applications, Fe shavings were compressed and modified to form Fe-based monolithic catalyst packing. Both of which exhibited excellent catalytic activity in catalytic ozonation industrial wastewater after biochemical treatment. Fe-based monolithic catalyst packing has irregular channels, large porosity, small pore diameter, and the effective specific surface area (SSA) up to 3500 m2/m3, these characteristics are conducive to mass transfer, and promote the effective utilisation of •OH in the catalyst “action zone”. A tower reactor (<3000 m3/d) and reinforced concrete construction reactor (>5000 m3/d) were designed according to the wastewater flow. Regression analysis showed that hydraulic residence time (HRT) and O3/CODin are important parameters in engineering design and operation. In addition, strategies for the application of Fe-based monolithic catalyst packing to wastewater with high salinity and high inorganic carbon concentration have been proposed. Fe-based monolithic catalyst packing catalytic ozonation is a relatively cost-effective and eco-friendly process with extremely broad application prospects in the advanced treatment of industrial wastewater. [Display omitted]