Abstract
The paper presents modelling of wastewater treatment plant (WWTP) operation work efficiency using a two-stage method based on selected probability distributions and the Monte Carlo method. Calculations were carried out in terms of sewage susceptibility to biodegradability. Pollutant indicators in raw sewage and in sewage after mechanical treatment and biological treatment were analysed: BOD5, COD, total suspended solids (TSS), total nitrogen (TN) and total phosphorus (TP). The compatibility of theoretical and empirical distributions was assessed using the Anderson–Darling test. The best-fitted statistical distributions were selected using Akaike criterion. Performed calculations made it possible to state that out of all proposed methods, the Gaussian mixture model (GMM) for distribution proved to be the best-fitted. Obtained simulation results proved that the statistical tools used in this paper describe the changes of pollutant indicators correctly. The calculations allowed us to state that the proposed calculation method can be an effective tool for predicting the course of subsequent sewage treatment stages. Modelling results can be used to make a reliable assessment of sewage susceptibility to biodegradability expressed by the BOD5/COD, BOD5/TN and BOD5/TP ratios. New data generated this way can be helpful for the assessment of WWTP operation work and for preparing different possible scenarios for their operation.
Highlights
Systematic control of the sewage quality at the outflow from a wastewater treatment plant (WWTP) is one of the elements of its proper operation
Investigation of sewage quality after mechanical and biological treatment processes allow us to assess whether WWTP facilities or technological lines function properly
The following theoretical distributions were considered in the group of candidate probability distributions: general extreme values (GEV), Gaussian mixture model (GMM), log-normal, normal, triangular and Weibull
Summary
Systematic control of the sewage quality at the outflow from a wastewater treatment plant (WWTP) is one of the elements of its proper operation. Knowledge about the values of pollutant indicators in sewage, e.g., BOD5, COD, total nitrogen and total phosphorus, in addition to the control purposes, makes it possible to determine the mutual proportions between them This in turn is useful for the assessment of sewage susceptibility to biodegradability. Because the content of assimilable carbon influences the course of biogenic compounds’ removal, determination of the BOD5/TN and BOD5/TP ratios is important Using these ratios, it is possible to assess sewage susceptibility to the biological nitrogen reduction by denitrification process and phosphorus reduction by dephosphatation process. Considering the above, the authors of this paper undertook to develop a model simulating the effectiveness of WWTP operation work in terms of pollutants reduction in the subsequent stages of mechanical and biological treatment. PAresliampinaarrtyoSfttahtiestpicraelliDmaitnaaArynadlyastias analysis of the pollutant indicators observational data series in raw sewage and in sewage after mechanical treatment and biological treatment, the following descrAipstiavpe asrtat toisfttihcsewpreerleimdeintearrmyidnaedta: aloncaaltyisoins mofetahseupreosll(umtainnitminudmic,amtoarxsimobusmer,vmateiaonn)aalnddatdaisspereiressioinn mraewassuerwesa(gsetananddardindesevwiaatigoen aSf,tceoremffiecciehnatnoicfavlatrriaetaitomneCnst).and biological treatment, the following
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