نتایج جستجو برای: clarifier

تعداد نتایج: 231  

2016
Hakima Elmahi Asmae Lahlou Hanane Baybay Salim Gallouj Fatima Zahra Mernissi Fatima Zahra Reggad Taoufik Harmouch

Résumé Le carcinome basosquameux (CBS) est un cancer cutané rare qui présente des zones de carcinome basocellulaire (CBC) et de carcinome épidermoïde (SCC) et une zone de transition entre elles. Cependant, les caractéristiques dermoscopiques du BSC ne sont pas bien décrites dans la littérature, sauf deux études. Le but du présent cas était de mieux identifier et clarifier la contribution de la ...

Journal: :Water 2022

Secondary clarifiers play a significant role in the successful operation of activated sludge systems. Because restriction available land, South Korean domestic wastewater treatment plants tend to employ rectangular settle mixed liquor suspended solids (MLSS) for A high MLSS concentration must be maintained bioreactor ensure nitrification during winters, and achieve stringent effluent quality. T...

2017
Timothy A. Shepherd Robert T. Burns Lara B. Moody D. Raj Raman Kenneth J. Stalder T. A. Shepherd R. T. Burns L. B. Moody D. R. Raman K. J. Stalder

Forced precipitation of struvite (MgNH4PO4 . 6H2O) can reduce dissolved reactive phosphorus (DRP) in swine manure slurries. Optimization of this process requires that the swine manure slurry pH be increased, that magnesium be added, and that sufficient reaction time be allowed for struvite precipitation. To gather data that could be used for a full-scale continuous-flow struvite precipitation r...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2007
U Jeppsson M-N Pons I Nopens J Alex J B Copp K V Gernaey C Rosen J-P Steyer P A Vanrolleghem

Over a decade ago, the concept of objectively evaluating the performance of control strategies by simulating them using a standard model implementation was introduced for activated sludge wastewater treatment plants. The resulting Benchmark Simulation Model No 1 (BSM1) has been the basis for a significant new development that is reported on here: Rather than only evaluating control strategies a...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2006
E I P Volcke K V Gernaey D Vrecko U Jeppsson M C M van Loosdrecht P A Vanrolleghem

In wastewater treatment plants (WWTPs) equipped with sludge digestion and dewatering systems, the reject water originating from these facilities contributes significantly to the nitrogen load of the activated sludge tanks, to which it is typically recycled. In this paper, the impact of reject water streams on the performance of a WWTP is assessed in a simulation study, using the Benchmark Simul...

Journal: :Numerische Mathematik 2010
Raimund Bürger Kenneth H. Karlsen Héctor Torres John D. Towers

Continuously operated clarifier-thickener units can be modeled by a non-linear, scalar conservation law with a flux that involves two parameters that depend discontinuously on the space variable. This paper presents two numerical schemes for the solution of this equation that have formal second-order accuracy in both the time and space variable. One of the schemes is a standard total variation ...

2000
Bob De Clercq Ingmar Nopens Ruxandra Govoreanu Paul Van Der Meeren Peter Vanrolleghem

During the biological treatment of wastewater the waste is biodegraded by micro-organisms. This is one of the principal goals. A probably even more crucial unit process is the clarification. Indeed, clarifying the “purified” water is necessary to remove the particulate fraction in which the micro-organisms reside. According to Wanner (1994) the washout of sludge contributes to 50 to 80% of the ...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2005
C Beck G Prades A G Sadowski

The principal objective of our study was to optimise a municipal activated sludge wastewater treatment plant (WWTP) to face high organic flows due to viticulture effluents inputs. Treatment file optimization consisted in testing different treatment lines, changing the number and volume of biological basins and clarifiers, with or without a buffer basin upstream, with a view to achieving a bette...

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