- Chemical and Biomolecular Engineering - Research Publications
Chemical and Biomolecular Engineering - Research Publications
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ItemScum formation and consolidation in covered anaerobic lagoonsSTICKLAND, AD ; LESTER, DR ; Eshtiaghi, N ; Bobade, V ; Das, T ; USHER, SP ; REES, C ; McMurrich, D (Australian Water Association, 2022)Scum builds up in covered anerobic lagoons that reduces hydraulic retention time, inhibits biogas capture, and damages lagoon covers. We demonstrate that the majority of this biomass sinks when degassed, indicating it mostly consists of undigested sludge floated by biogas. Thus, scum accumulation is inevitable and is not prevented by source control of fats, oils and floating debris; scum must be periodically and mechanically removed. We develop a theory of scum consolidation and desaturation driven by buoyancy and evaporation, and measure scum permeability and compressibility, to predict scum behaviour. Continued scum accumulation leads to densification and eventually crusting. The recommended scum management technique involves frequent agitation at low accumulation to liberate biogas, sinking biomass to digest it.
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ItemCharacterization of Bed Densification in a Laboratory Scale Thickener, by Novel Application of an Acoustic Backscatter SystemHunter, TN ; Usher, SP ; Biggs, S ; Scales, PJ ; Stickland, AD ; Franks, GV ; Ge, W ; Han, Y ; Wang, J ; Wang, L ; Liu, X ; Zhou, J ; Li, J (Elsevier, 2015)
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ItemCompressive strength and capillary pressure: competing properties of compressible sediments that determine breakthrough pressureStickland, AD ; TEO, H ; Franks, GV ; Scales, PJ (Filtech Exhibitions Germany, 2012)