scholarly journals Effects of scale and Froude number on the hydraulics of waste stabilization ponds

2017 ◽  
Vol 77 (1) ◽  
pp. 239-247
Author(s):  
Isabela De Luna Vieira ◽  
Jhonatan Barbosa Da Silva ◽  
Carlos Nobuyoshi Ide ◽  
Johannes Gérson Janzen
Keyword(s):  
Froude Number ◽  
Reynolds Numbers ◽  
Transport Processes ◽  
Tracer Transport ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Good Agreement

Abstract This paper presents the findings from a series of computational fluid dynamics simulations to estimate the effect of scale and Froude number on hydraulic performance and effluent pollutant fraction of scaled waste stabilization ponds designed using Froude similarity. Prior to its application, the model was verified by comparing the computational and experimental results of a model scaled pond, showing good agreement and confirming that the model accurately reproduces the hydrodynamics and tracer transport processes. Our results showed that the scale and the interaction between scale and Froude number has an effect on the hydraulics of ponds. At 1:5 scale, the increase of scale increased short-circuiting and decreased mixing. Furthermore, at 1:10 scale, the increase of scale decreased the effluent pollutant fraction. Since the Reynolds effect cannot be ignored, a ratio of Reynolds and Froude numbers was suggested to predict the effluent pollutant fraction for flows with different Reynolds numbers.

Rotavirus removal in experimental waste stabilization pond systems with different geometries and configurations

1995 ◽  
Vol 31 (12) ◽  
pp. 285-290 ◽  
Author(s):  
J. I. Oragui ◽  
H. Arridge ◽  
D. D. Mara ◽  
H. W. Pearson ◽  
S. A. Silva
Keyword(s):  
Clostridium Perfringens ◽  
Slow Process ◽  
Faecal Coliforms ◽  
Waste Stabilization Ponds ◽  
Stabilization Pond ◽  
Waste Stabilization Pond ◽  
Stabilization Ponds ◽  
Waste Stabilization

Rotavirus removal in waste stabilization ponds is a relatively slow process: in a series of ten ponds (a 1-d anaerobic pond followed by nine 2-d ponds) its numbers were reduced from 1.4 × 105 per litre to zero, and in an “innovative” series (a 1-day anaerobic pond, 3-d facultative pond, 3.8-d, 3-d and 5-d maturation ponds) from 5.1 × 104 per litre to <5 per litre. Faecal coliforms were better indicators of rotaviruses than was Clostridium perfringens .

Waste stabilization ponds in France: a report on fifteen years experience

1995 ◽  
Vol 31 (12) ◽  
pp. 91-101 ◽  
Author(s):  
Y. Racault ◽  
C. Boutin ◽  
A. Seguin
Keyword(s):  
Load Level ◽  
Organic Load ◽  
Nitrogen And Phosphorus ◽  
Waste Stabilization Ponds ◽  
Sewerage System ◽  
System Type ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Output Load

In 1992, a survey was conducted on the performance of waste stabilization ponds in France. The data selected come from a sample of 178 ponds, with an average capacity of 600 p.e., throughout France. For each plant, one or several input--output load measurements over a 24-h period are available. The average organic load level received is approximately 25 kg BOD/ha.d, representing 50% of the nominal load. The quality of the treated water is presented based on the type of sewerage system feeding the ponds. The results appear dispersed, however; in 70% of the cases the concentrations in COD and BOD on filtered samples are under 120 mg/l and 40 mg/l, respectively, and the concentration in TSS under 120 mg/l (discharge standards in France for waste stabilization ponds). The reductions in nitrogen and phosphorus nutrients are on average from 60% to 70%. The influence of different parameters (sewerage system type, organic load, season, age of plant, etc.) was studied. The results appear noticeably worse when the ponds receive wastewater from a strictly separate sewerage system.

scholarly journals Evaluation of contaminants removal by waste stabilization ponds: A case study of Siloam WSPs in Vhembe District, South Africa

Heliyon ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. e06207
Author(s):  
Joshua N. Edokpayi ◽  
John O. Odiyo ◽  
Oluwaseun E. Popoola ◽  
Titus A.M. Msagati
Keyword(s):  
South Africa ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Contaminants Removal ◽  
Vhembe District

Performance of a system combining aerated lagoons and waste stabilization ponds in a temperate climate

2000 ◽  
Vol 42 (10-11) ◽  
pp. 23-34 ◽  
Author(s):  
T. Nameche ◽  
O. Dufayt ◽  
H. El Ouarghi ◽  
J.L. Vasel
Keyword(s):  
High Efficiency ◽  
Treatment Plant ◽  
Organic Load ◽  
Temperate Climate ◽  
Absolute Difference ◽  
Waste Stabilization Ponds ◽  
Mean Absolute Difference ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Components Analysis

AbstractThe Bertrix wastewater treatment plant was designed and built for experimental purposes, especially for comparing aerated lagoons and stabilization ponds in a temperate climate. This plant was designed for a capacity of 7500 inhab. eq, and aerated lagoons were dimensioned to eliminate 50% of the organic load. The remaining load has to be degraded in the series of stabilization ponds. In this paper we shall present the plant in more detail and the results of a 3-year study, i.e., 79 rounds of samples for each of the five ponds under study, placing emphasis on the performances of aerated lagoons and stabilization ponds. Principal components analysis (of inflow and outflow) of aerated lagoons and stabilization ponds will be presented and commented on. The most important factors are the hydraulic loading and the concentrations. Seasonal variations appear only in the basins' temperatures. The fates of nitrogen compounds are quite different from those of organic compounds, confirming that a high efficiency of nitrogen removal is difficult to achieve, especially for short residence times (less than eight days). A few other conclusions of our study are given below: The ponds' hydrodynamics has been studied and a mathematical model is now available If there is no stratification in the ponds, a thermal model can be proposed where the mean absolute difference is 0.7°C±0.2. In the system under study, the contribution of algal biomass to the system is very small.

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