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.

The potential for water hyacinth to improve the quality of Bogota River water in the Muña Reservoir: comparison with the performance of waste stabilization ponds

2002 ◽  
Vol 45 (1) ◽  
pp. 103-110 ◽  
Author(s):  
E. Giraldo ◽  
A. Garzón
Keyword(s):  
Water Quality ◽  
Hydrogen Sulfide ◽  
Water Hyacinth ◽  
Suspended Solids ◽  
Surface Loading ◽  
Waste Stabilization Ponds ◽  
Hydrogen Sulfide Removal ◽  
Waste Stabilization ◽  
Almost All

The potential application of Water Hyacinth (Eichhornia crassipes) in organic matter degradation, sedimentation, nutrient and heavy metal absorption and sulfur reduction in the Muña Reservoir has been tested in experimental lagoons. The lagoons were operated at hydraulic retention times (HRT) of 6, 9 and 15 days. One lagoon was covered with Water Hyacinth, which is naturally growing in the Muña Reservoir, while another lagoon was operated as a conventional oxidation pond. The Water Hyacinth lagoon had better removal efficiencies for almost all parameters measured: BOD5, total suspended solids, COD, nitrogen, phosphorus and heavy metals. The oxidation lagoon was facultative for HRT of 9 and 15 days, and anoxic when operated at 6 days HRT. At HRT of 15 days the water quality in the effluent of the covered lagoon corresponded to 12 mg/l of BOD, 6 mg/l of suspended solids and 0.8 mg/l of hydrogen sulfide. Hydrogen sulfide levels in the Muña reservoir can be substantially reduced at HRT higher than 15 days in both lagoons. The uncovered lagoon had better hydrogen sulfide removal during the day but presents high levels at night. If the hydraulic retention time in the Muña reservoir is increased, the water quality of the Bogota river can be substantially improved for all the HRTs tested in the pilot units. HRT seems to give a better prediction of overall effluent water quality than surface loading. More research is needed in order to define the optimum water hyacinth density in the Muña reservoir to determine its influence on the water quality of the effluent. The influence is expected to be negative due to an internal increase of BOD, solids, nutrients and metals loads due to plant decay.

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.

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

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

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.

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.

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