Operational and structural A-stage improvements for high-rate carbon removal


Bio-sorption of organics is investigated at two sites in order to optimize operation and infrastructure for carbon removal and redirection in up-stream, high-rate processes. Sufficient process temperature and stable mixed liquor solids concentration were established as the key impact parameters for the process performance. Improved COD removal was achieved by either substantially enhanced aeration (elevated metabolic state) or by enhanced flocculation capability (dosed chemicals). Separation and thickening of organics are typically operated as continuous-flow processes. The optimization of performance parameters led to a new A-stage process named Alternating Activated Adsorption. The AAA-process is presented as a novel configuration linking bio-sorption and thickening capabilities in an alternating scheme without mechanical equipment. The performance data from its first trial indicate benefits from process dynamics including high organics capture rates and thickening capabilities reaching solids concentrations higher than 40 g(TSS)/L. COD removal could be increased further by adding biologically-generated polymer i.e. waste sludge from B-stage.

Authors: Wett B, Aichinger P, Hell M, Anderson M, Wellym, Fukuzaki Y, Cao Y, Tao G, Jimenez J, Takacs I, Bott C, Murthy S
; Full Source: Water Environment Research: A research publication of the Water Environment Federation. 2020 May 1. doi: 10.1002/wer.1354. [Epub ahead of print]