Physico-Chemical Parameters Influencing Faecal Bacterial Survival in Waste Stabilization Ponds

1987 ◽  
Vol 19 (12) ◽  
pp. 145-152 ◽  
Author(s):  
H. W. Pearson ◽  
D. D. Mara ◽  
S. W. Mills ◽  
D. J. Smallman
Keyword(s):  
Dissolved Oxygen ◽  
Elevated Temperatures ◽  
Ph Effect ◽  
Faecal Coliform ◽  
Bacterial Survival ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Physico Chemical

In situ studies on waste stabilization ponds (in Portugal) showed that faecal coliform numbers were lowest at positions in the water column where pH, temperature, dissolved oxygen and algae were high. Numbers were not always lowest at the surface where light intensities were highest or in ponds where light penetration had increased through algal grazing by Daphnia. Laboratory studies showed that pH values approaching 9.0 or above increased faecal coliform die-off particularly under nutrient-poor conditions. Elevated temperatures enhanced the pH effect but the level of dissolved oxygen made little difference. Streptococcus, Salmonella and Campylobacter isolates all behaved similarly to the faecal coliforms. Daphnia grazing of the algal population in maturation ponds may reduce the microbial quality of the final effluent. These findings are discussed in relation to pond design.

Design of water hyacinth ponds for removing algal particles from waste stabilization ponds

2004 ◽  
Vol 48 (11-12) ◽  
pp. 115-123 ◽  
Author(s):  
Y. Kim ◽  
D.L. Giokas ◽  
P.-G. Chung ◽  
D.-R. Lee
Keyword(s):  
Dissolved Oxygen ◽  
Water Hyacinth ◽  
Suspended Solids ◽  
Ph Dependence ◽  
Waste Stabilization Ponds ◽  
State Reduction ◽  
Detention Time ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Separation Model

In this study it was demonstrated that when water hyacinth ponds (WHPs) are used for polishing the effluent from waste stabilization ponds (WSPs), suspended solids (mostly algal particles) are efficiently separated, which also resulted in the reduction of insoluble forms of COD and nutrients. The high pH of the WSPs effluent was easily adjusted to 6-7 as it passed through the WHPs. However, the use of water hyacinth rapidly reduced dissolved oxygen at the first cell to less than three mg/L or very frequently to a level of anaerobic state. Reduction of suspended solids at the WHPs mainly depends on the detention time and pH. An empirical separation model incorporating the detention time and pH dependence was developed.

Modelling diurnal variation of dissolved oxygen in waste stabilization ponds

2000 ◽  
Vol 127 (1) ◽  
pp. 21-31 ◽  
Author(s):  
S Kayombo ◽  
T.S.A Mbwette ◽  
A.W Mayo ◽  
J.H.Y Katima ◽  
S.E Jorgensen
Keyword(s):  
Dissolved Oxygen ◽  
Diurnal Variation ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization

scholarly journals Hydro-biological characterization and efficiency of natural waste stabilization ponds in a desert climate (city of Assa, Southern Morocco)

2021 ◽  
Author(s):  
Badre Achag ◽  
Hind Mouhanni ◽  
Abdelaziz Bendou
Keyword(s):  
Principal Component ◽  
Water Clarity ◽  
Organic Load ◽  
Low Oxygen ◽  
Rapid Urbanization ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Physico Chemical ◽  
The City

Abstract The city of Assa is located in a Saharian area characterized by an arid climate and water scarcity. Like any other Saharian city in a developing country, the city is facing the challenges of rapid urbanization and the need to improve wastewater treatment and management. The main objective of this work is to assess the performance of waste stabilization ponds in an arid area. This evaluation concerns microbiological and physico-chemical monitoring over three and twelve months respectively. Microbiological results indicate bacterial elimination rates of over 90% in autumn–winter due to the effectiveness of facultative ponds with 20–25 days of retention time, water clarity, ponds depth, and high sunlight exposure and penetration. Physico-chemical parameters surpass the Moroccan standards for reuse except Ph and T0 by 20–30%, this wastewater is relatively loaded with various pollutants, especially high organic load and low oxygen content. Statistical analysis has been made by principal component analysis (PCA), and confirms that dissolved oxygen, total suspended solids, COD and BOD5 do not reach the threshold for discharge into the natural environment, and moreover their reuse. For the improvement of the quality of these waters, it is legitimate to provide an upgrade of this plant by a tertiary treatment with maturation ponds.

Faecal coliform die-off in wastewater storage and treatment reservoirs

2000 ◽  
Vol 42 (10-11) ◽  
pp. 139-147 ◽  
Author(s):  
G. B. Athayde Júnior ◽  
D. D. Mara ◽  
H. W. Pearson ◽  
S. A. Silva
Keyword(s):  
Rainy Season ◽  
Pilot Scale ◽  
Faecal Coliform ◽  
Cost Ratio ◽  
Waste Stabilization Ponds ◽  
Net Return ◽  
Benefit Cost Ratio ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
In Series

This paper describes faecal coliform (FC) removal in pilot-scale Wastewater Storage and Treatment Reservoirs (WSTR) in northeast Brazil. FC decay during the filling phase of WSTR was very reduced, suggesting that these reactors should be filled as quickly as possible, and subjected to the highest organic loading that will not cause odour emissions. The highest loading employed in this study was 659 kgBOD5/ha.d, causing no nuisance conditions. During the resting phase, FC decay rate decreased exponentially and Chick's law was modified. The time into the resting phase for FC to reach 103 cfu/100 mL ranged from 15 to 25 days as WSTR depth varied from 2.00 to 6.50 m. The performance of sequential batch-fed waste stabilization ponds (SBFWSP) in removing FC was compared to that of waste stabilization ponds (WSP) operated in series. It was shown that, in general, SBFWSP were cheaper than WSP in series, with the bacteriological quality of the effluent in the former being more reliably predicted than in the latter operational regime. When provision of volume to store the winter effluents is considered, a WSP system presents a higher benefit/cost ratio than a hybrid WSP-WSTR system, but the adoption of the latter can double the annual net return for a rainy season of 5 months for instance. In the case of use of the hybrid WSP-WSTR system, the net return would be US$ 0.17 – 0.22 per cubic metre of available wastewater, depending on the length of the rainy season (3 – 5 months considered) as compared to US$ 0.12 from the WSP system alone.

scholarly journals A Closer Look on Spatiotemporal Variations of Dissolved Oxygen in Waste Stabilization Ponds Using Mixed Models

Water ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 201 ◽  
Author(s):  
Long Ho ◽  
Duy Pham ◽  
Wout Van Echelpoel ◽  
Leacky Muchene ◽  
Ziv Shkedy ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Mixed Models ◽  
Spatiotemporal Variations ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization

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.

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