PubMed · 10289062
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R O Crawford. 1988. Plan with flexibility as the top priority.. https://pubmed.ncbi.nlm.nih.gov/10289062/
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Solid-liquid separation equipment operating on wastewater duties seldom functions at steady state and may be expected to perform over a wide range of feed loads. Satisfactory control of the solids residence time in these clarifiers and thickeners is critical to their successful operation. High solids residence times can lead to hydrolysis and rising sludge. This paper addresses the design of clarifiers and thickeners with minimum solids residence times. A one-dimensional force balance theory of sedimentation is used as the basis for the optimal design. Turn-up and turn-down are considered directly within the optimisation. A robust algorithm is presented for the repeated solution of the design equations and the constrained optimisation of the solids residence time. Three types controlling phenomena are identified and illustrated with design cases. The designs are found to be taller with smaller plan areas than their point optimised equivalents.
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A newly developed model for the optimum municipal wastewater treatment plant (MWTP) design is presented. Through introducing the interval variables, the model attempts to consider the effects of uncertainties caused by the fluctuation of the wastewater quality and quantity during the design of MWTP. The model solution procedure is illustrated in detail, and a numerical example is given to verify the feasibility and advantage of the model. Furthermore, the possibility of the model application is briefly outlined.