Comparison of sludges produced from two different recirculating aquaculture systems (RAS) for recycle and disposal
2019
Maigual-Enriquez, Yemall Alexander | Maia, Amanda Alves Domingos | Guerrero-Romero, Camilo Lenin | Matsumoto, Tsunao | Rangel, Elidiane Cipriano | Morais, Leandro Cardoso de
Sludges from Submerged Biofilter (SBF) and Aerobic Three Phase Airlift Fluidized Bed Reactor with Circulation in Concentric Tubes (AAFBR-CT) wastewater treatment of recirculating aquaculture systems (RAS) were evaluated by thermogravimetric analysis. It was considered a microstructural analysis by SEM-EDX and XRD to identify the sample composition. SBF and AAFBR-CT sludge, presented three stages for both combustion and pyrolysis. The first stage to 180 °C was characterized by loss of water, low-stability organic compounds, the second stage, between 235 °C and 385 °C was characterized by decomposition of carbohydrate, lipids, and proteins. The third stage, between 420 °C and 540 °C represents a decomposition of monounsaturated, polyunsaturated fatty acids and amino groups. This sludge had a high ash content and is not viable to use for energy purposes. Presence of granular material was revealed by SEM. XRD analysis only identified SiO₂. The sludges generated by RAS could be used in brick and ceramic manufacture, adsorbent material or for phosphorus recovery.
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