Response of solute transport model parameters to the combination of multiple design parameters and their quantitative ex
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RESEARCH ARTICLE
Response of solute transport model parameters to the combination of multiple design parameters and their quantitative expression with hydraulic indicators of FWS-constructed wetlands Changqiang Guo 1,2 & Yuanlai Cui 1 & Yufeng Luo 1 Received: 21 March 2020 / Accepted: 21 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020, corrected publication August 2020
Abstract Solute transport models and hydraulic indicators are commonly used to assess the flow pattern of free water surface–constructed wetlands (FWS CWs). However, the relationship between solute transport models and hydraulic performance remains poorly understood. The hybrid model comprised of plug flow with dispersion and continuous stirred tank reactors (PFD + CSTRs) was applied in this study. The variation rules of model parameters, namely the flow ratio of the mixed zone f, volume ratio of the mixed zone z, dispersion number D, and number of mixed tanks N, were obtained by fitting of the normalized tracer data of orthogonal tests. The coefficients of determination (R2) exceeded 0.7 and the correlation coefficient (r) surpassed 0.8. The results demonstrated satisfactory hydraulic performance and purification effect, with high hydraulic and water quality indicators. Water depth was the principal design parameter negatively affecting f and z, whereas the layout of in- and outlet positively influenced D and N. The R2 of the model parameters f, z, and D on most hydraulic indicators were above 0.5. Significantly positive correlations existed between the model parameters f, z, and D and the hydraulic indicators including the short-circuit index φ10, effective volume ratio e, and moment index MI. The quantitative links between model parameters and hydraulic indicators were established. Based on the significant correlations between design parameters, hydraulic indicators, and model parameters, it would be more convenient to evaluate the hydraulic performance of FWS CWs corresponding to specific design parameters. Keywords Orthogonal test . Design parameter . Hydraulic indicator . PFD + CSTRs . Model parameter . Quantitative expression
Introduction The original article was revised: The correct Fig. 6 is presented in this paper. Highlights • Water depth and in-out layout were significantly correlated with model parameters. • Hydraulic indicators and model parameters had strong positive correlations. • The expressions between model parameters and hydraulic indicators were proposed. Responsible editor: Alexandros Stefanakis Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10250-z) contains supplementary material, which is available to authorized users. * Yuanlai Cui [email protected] 1
State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Free water surface–constructed wetlands (FWS CWs) are widely used in sewage treat
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