Picking the Right Model for the Sustainable Design of Wastewater Treatment Plants

2008 ◽  
Vol 2008 (14) ◽  
pp. 2748-2756
Author(s):  
Andrew Shaw
2006 ◽  
Vol 53 (3) ◽  
pp. 101-110 ◽  
Author(s):  
T. Oda ◽  
T. Yano ◽  
Y. Niboshi

A numerical analysis technique for optimisation of microbial reaction and sludge flow has been developed in this study. The technique is based on the 3D multiphase Navier–Stokes solver with turbulence models. In order to make numerical analyses of the total processes in wastewater treatment plants possible, four numerical models, the microbial reaction model, a sludge settling model, oxygen mass transfer model from coarse bubbles, and a model from fine bubbles, are added to the solver. All parameters included in those models are calibrated in accordance with experimental results, and good agreements between calculated results and experimental results are found. Finally, this study shows that the numerical technique can be used to optimise wastewater treatment plants with an example of the operational optimisation of an intermittent agitation in anoxic reactors by coarse bubbles. With a proper appreciation of its limit and advantages, the exploitation of the CFD efficiently leads us to the right direction even though it is not quantitatively perfect.


2013 ◽  
Vol 6 (4) ◽  
pp. 588-592
Author(s):  
Vytenis Leonavičius

In biological wastewater treatment plants, the right selection of an aerator is one of the most important elements. The choice of the aerator must take in account its performance – dissolved oxygen content per unit of energy consumed, oxidative capacity and supply of the required amount of air so that the required concentration of oxygen is saturated properly. The experiments have been conducted carefully examining the efficiency of the selected deep–cavitation aerator operating without the aerator tip or with attached two and three–blade tips. The performed investigation included air dispersion methods of opposite ejecting for determining air flow, flow pressure and dependence of vibration on different placement of the aerator under varying positions of corners. It has been established that compared to air ejecting flow, changes in pressure and vibration are most significantly influenced by a deep–cavitation aerator having a three–blade tip. Santrauka Biologiniuose nuotekų valymo įrenginiuose tinkamo aeratoriaus parinkimas yra vienas iš svarbiausių elementų. Parenkant aeratorių reikia atsižvelgti į jo darbo efektyvumą – ištirpinamą deguonies kiekį, tenkantį suvartotos energijos vienetui, oksidacinį pajėgumą ir reikiamą tiekti oro kiekį, kad būtų prisotintos nuotekos deguonimi iki reikiamos koncentracijos. Bandymai atlikti tiriant pasirinkto giluminio kavitacinio aeratoriaus veikimo efektyvumą be antgalio ir prie aeratoriaus pritvirtinus dviejų ir trijų menčių antgalius. Tyrimo metu taikant priešpriešinio srauto ežektoriaus oro dispergavimo metodus, buvo siekiama nustatyti ežektoriaus oro debitą, srauto slėgį ir vibracijos pokyčio priklausomybę nuo aeratoriaus padėties esant skirtingiems aeratoriaus statymo kampams. Nustatyta, kad lyginant pagal ežektoriaus oro debitą, slėgio ir vibracijos pokytį efektyviausiai veikia giluminis kavitacinis aeratorius su trijų menčių antgaliu.


Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1246
Author(s):  
Aleš Paulu ◽  
Jan Bartáček ◽  
Markéta Šerešová ◽  
Vladimír Kočí

Alternative wastewater treatment (WWT) technologies with lower environmental impacts seem to be the way forward in the pursuit of sustainable wastewater treatment plants (WWTPs). Process modelling of material and energy flows together with life-cycle assessment (LCA) can help to better understand these impacts and show the right direction for their development. Here, we apply this combined approach to three scenarios: conventional WWT; conventional WWT + chemically enhanced primary treatment (CEPT); conventional WWT + CEPT + side stream partial nitritation/anammox (PN/A). For each scenario, equations were developed to calculate chemical oxygen demand and nitrogen flow (solid and dissolved form) through the WWTP and to estimate the energy demands of its unit operations. LCA showed that the main environmental impact categories for all scenarios were global warming potential (GWP), eutrophication potential (EP) and marine aquatic eco-toxicity potential (MAETP). Compared with conventional WWT, CEPT and CEPT combined with PN/A resulted in a higher sum of normalized and weighed environmental indicators, by 19.5% and 16.4%, respectively (20.0% and 18.3% including biogenic carbon). Interestingly, the environmentally positive features of the alternative scenarios were often traded-off against other increased negative impacts. This suggests that further development is needed to consider these technologies a sustainable alternative.


2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.


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