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HRAS Lab Report

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As commented on previous sections, the operation of the HRAS process at much shorter SRTs in comparison with the CAS would bring significant advantages and benefits such as energy recovery. This project could make a valuable contribution by providing the optimal conditions of the HRAS process. However, recent research indicates that still there are a number of knowledge gaps related to the most beneficial conditions for COD removal and redirection for energy generation. This includes the corroboration of data and validation of certain hypothesis. Based on previous studies and the literature review, some of the knowledge gaps are pointed below. • The effect of SRTs on the bio-floculation of the particulate substrate could be related to…show more content…
2014); and • To determine the observed sludge yield (g VSS/ g COD) at the different HRAS operational conditions (SRT, DO, HRT). 3.1.3 Research Questions The focus on this research is to find the optimal conditions for the operation of a very efficient carbon removal process that be able to capture the majority of the COD and re-directed for energy generation. This will create a new path to treat wastewater at very attractive cost-benefit numbers. The specific objectives are outlined below: To find the most beneficial operational conditions for the COD removal fractions (sCOD, pCOD, cCOD) Based on the limited findings the operational conditions that benefit certain COD fraction particularly the sCOD does not benefit the cCOD and pCOD. It has indicated that biosorption, EPS production and bio-flocculation are directly influenced by the entering feed, DO and SRTs. As such, the quantification of biosorption by known the EPS production, definition of optimal conditions by varying the SRT and HRT, assessment of the calculated kinetic coefficients and evaluation of the OUR profile at different pre- stablish SRTs would be required. To conclude that would be beneficial to know what is the best possible combination of operational conditions (SRT, DO, HRT, T) that could achieve similar high COD removals across all the fractions maximizing the carbon redirection. The calculation of coefficients such
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