scholarly journals Suspended solids settling and half removal time in stabilization ponds (Tunisia)

2011 ◽  
Vol 24 (1) ◽  
pp. 53-61
Author(s):  
Kôkôh Rose Effebi ◽  
Chema Keffala ◽  
Jean Luc Vasel
Keyword(s):  
Suspended Solids ◽  
Treatment Plant ◽  
Treatment Center ◽  
Waste Stabilization Ponds ◽  
Removal Time ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Making A Difference ◽  
Sampling Systems ◽  
Settling Process

Settling is one of the processes occurring in waste stabilization ponds (WSP). Part of suspended solids (SS) is removed by sedimentation but very often the efficiency of WSP is presented without making a difference between settling and biological processes. In this way the WSP is seen as a black box process. This work presents an experimental approach to the study of the removal of wastewater suspended solids in a test column in order to improve our knowledge of the settling process in ponds. These results show that the settling test in columns can be used to estimate the half removal time (t50) for the study of settling characteristics of suspended solids in wastewater stabilization ponds. The aim of this study was to determine the half removal time (t50) in anaerobic, facultative and maturation ponds, and in the influent to these ponds, at the experimental wastewater treatment plant of CERTE (Recycling and Treatment Center of Wastewater in Tunisia), by a column settling test. The experiments lasted between 15 and 120 min. The column was 2 m high with sampling systems at various depths: 40, 80, 120, 160 and 200 cm. Half-removal suspended solids time t50 was defined as the time at which 50% of SS was removed. Models derived from the scientific literature were used to interpret the experimental data. The experimental results demonstrated that higher suspended solids concentrations in the influent led to shorter t50 values and better settling.

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.

scholarly journals Efficiency of Horizontal Roughing Filter in Removing Suspended Solids from Effluent of Waste Stabilization Ponds in 2013

2017 ◽  
Vol 6 (4) ◽  
pp. 320-325
Author(s):  
Seyed Mostafa Khezri ◽  
Hossein Jafari Mansoorian ◽  
Gharib Majidi ◽  
Farideh Atabi ◽  
Taha Tohidi Moghaddam ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization

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.

Canal networks as extended waste stabilization ponds: fate of pathogens in constructed waterways in Pathumthani Province, Thailand

2007 ◽  
Vol 55 (11) ◽  
pp. 143-156 ◽  
Author(s):  
A.J. Anceno ◽  
M. Ozaki ◽  
Y.N.D. Dang ◽  
B. Chuluun ◽  
O.V. Shipin
Keyword(s):  
Treatment Plant ◽  
Local Context ◽  
Indicator Organisms ◽  
Probability Models ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Canal Networks ◽  
Pathogen Occurrence ◽  
Established Infection

The occurrence and fate of surface water and wastewater pathogens (faecal coliforms, Escherichia coli, Giardia lamblia and Cryptosporidium parvum) in two constructed waterways and a pond-based AIT wastewater treatment plant (AIT WWTP) in Pathumthani, Thailand were studied in the context of several biogeochemical factors and in relation to pollutional pressure and seasonal phenomena with a view to proposing potential mechanisms for their removal. More data on pathogen removal in a given local context would provide assurance that some pathogens could serve as suitable indicator organisms and predict removal of different pathogenic microorganisms such as protozoan parasites covered in this study. The enumeration technique for protozoan pathogens was improved in terms of application of emerging novel molecular technologies for the development of a fast but affordable microbiological method. Potential risk of waterborne disease outbreak in pertinent communities was then characterized using established infection probability models and the compiled pathogen occurrence data. Overall, we have addressed several strategic priorities of pathogen research in waste stabilization ponds in developing tropical countries like Thailand.

A Study of Upgrading Waste Stabilization Ponds

1987 ◽  
Vol 19 (1-2) ◽  
pp. 77-83
Author(s):  
P. R. Thomas ◽  
H. O. Phelps
Keyword(s):  
Suspended Solids ◽  
Oxygen Demand ◽  
Domestic Sewage ◽  
Coliform Bacteria ◽  
Waste Stabilization Ponds ◽  
Effluent Quality ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Before And After ◽  
Water Hyacinths

A study was carried out in one of the two facultative stabilization ponds operating in parallel and receiving domestic sewage in excess of their capacities. Effluent quality from the pond was monitored in terms of the parameters total suspended solids, biochemical oxygen demand, pH, dissolved oxygen and faecal coliform bacteria before and after the introduction of water hyacinths. No significant improvement in effluent quality was observed after the introduction of the water hyacinths. High loading on the pond did not permit to upgrade the effluent quality to acceptable standards by the use of water hyacinths. Although the research is continuing some results and recommendations are given.

Attached-Growth Waste Stabilization Pond Treatment Evaluation

1987 ◽  
Vol 19 (12) ◽  
pp. 229-235 ◽  
Author(s):  
H. K. Shin ◽  
Chongrak Polprasert
Keyword(s):  
Fecal Coliform ◽  
Suspended Solids ◽  
Pond Water ◽  
Pilot Scale ◽  
Growth Media ◽  
Waste Stabilization Ponds ◽  
Attached Growth ◽  
Stabilization Ponds ◽  
Control Units ◽  
Waste Stabilization

This study investigated the feasibi1ity of improving waste stabilization ponds (WSP) performance through the addition of attached-growth media in the pond water. An artificial media consisting of fine strings of polyvinylidene chloride was employed as an attached-growth media in the laboratory-scale and pilot-scale experiments. Better removal of organic, nutrient and suspended solids were obtained in the attached-growth waste stabilization ponds (AGWSP). The AGWSP were found to be rather stable against increased hydraulic loadings. However, the fecal coliform die-off in the AGWSP units were not significantly different from those of the control units without attached-growth media.

Microorganism Removal in Waste Stabilization Ponds in Portugal

1987 ◽  
Vol 19 (12) ◽  
pp. 141-144 ◽  
Author(s):  
M Jenny do Nascimento
Keyword(s):  
Removal Efficiency ◽  
Waste Treatment ◽  
Treatment Plant ◽  
Biological Indicators ◽  
Indicator Organisms ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Waste Treatment Plant ◽  
Microorganism Removal

This study has evaluated the removal of traditional biological indicators of faecal pollution and two new indicators: Pseudomonasaeruginosa and Clostridiumperfringens in waste stabilization ponds which were installed at the waste treatment plant of Loures, at Frielas, near Lisbon. The removal efficiency for indicator organisms was 10/100 ml in the anaerobic pond A1, except for one of them, and less in A2. In facultative ponds the removal was 10/100 ml while in maturation pond M2 the removal efficiency was higher for traditional indicators than for the new indicators; in pond Ml the removal was less than in M2.

scholarly journals Performance evaluation of waste stabilization ponds on removal of Listeria spp.: a case study of Isfahan, Iran

2018 ◽  
Vol 16 (4) ◽  
pp. 614-621
Author(s):  
Atefeh Taherkhani ◽  
Hossein Movahedyan Attar ◽  
Seyyed Abbas Mirzaee ◽  
Mehdi Ahmadmoazzam ◽  
Neemat Jaafarzadeh ◽  
...  
Keyword(s):  
Treatment Plant ◽  
Pcr Amplification ◽  
Total Coliform ◽  
Most Probable Number ◽  
Waste Stabilization Ponds ◽  
Probable Number ◽  
Selective Enrichment ◽  
Stabilization Ponds ◽  
Sampling Locations ◽  
Waste Stabilization

Abstract The aim of the present study was to assess performance of waste stabilization ponds (WSPs) on the removal of Listeria spp. in Isfahan, Iran. A total of 104 samples were taken from eight sampling locations from influent and effluent of a wastewater treatment plant (WWTP). Sewage samples were analyzed for the presence of Listeria spp. using selective enrichment protocol. Listeria isolates were also identified by biochemical and polymerase chain reaction (PCR) amplification. Listeria spp. was enumerated by a three tube most probable number (MPN) for total coliform counts (TC), fecal coliform counts (FC), total suspended solids (TSS), and total dissolved solids (TDS). In total, 54/104 (51.92%), 49/104 (47.11%), 36/104 (34.61%), and 27/104 (25.95%) samples were positive for Listeria spp., L. monocytogenes, L. innocua, and L. seeligeri, respectively. The mean MPN/100 mL enumeration of L. monocytogenes for influent, anaerobic, facultative ponds 1, 2, 3, 4 and maturation ponds 1 and 2 were 21.54, 10.61, 8, 5.77, 4, 2.54, 1.38, and 0.46, respectively. The removal percentage of Listeria spp. in the anaerobic, facultative, and maturation ponds were 44.71, 76.5, and 81.4%, respectively. Results showed that the WSPs were able to decrease the Listeria spp. levels significantly, although unable to remove them completely.

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