Modelling Sedimentation Basins

Abstract A simple Flow Model is proposed to describe the dynamic response of sedimentation basins. The response predicted by this model is linear as opposed to the real response of the basin which is nonlinear. However, the real response of the basin is highly correlated with its densimetric Froude number, and as a consequence our linear model effectively predicts the response of the basin in a restricted densimetric Froude Number range. Our experiments show that the response of the basin becomes more sluggish and erratic as the densimetric Froude number decreases.

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Numerical Analysis of Flow in Sedimentation Basins

Journal of the Hydraulics Division ◽

10.1061/jyceaj.0005665 ◽

1981 ◽

Vol 107 (5) ◽

pp. 575-591 ◽

Cited By ~ 1

Author(s):

David R. Schamber ◽

Bruce E. Larock

Keyword(s):

Numerical Analysis ◽

Sedimentation Basins

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PERANCANGAN BAK PRASEDIMENTASI

Potensi : Jurnal Sipil Politeknik ◽

10.35313/potensi.v17i1.518 ◽

2015 ◽

Vol 17 (1) ◽

Author(s):

R. Esther Ambat ◽

R. Andjar Prasetyo

Keyword(s):

Sedimentation Basins

Sistem penyediaan air minum harus dapat menyediakan air yang memadai dari segi kualitas maupun kuantitas. Fungsi utama dari bangunan bak prasedimentasi (Plain Sedimentation Basins) adalah untuk menghilangkan/mencegah gravel, pasir, lumpur, maupun material kasar lainnya agar tidak masuk ke dalam Instalasi Pengolahan Air (IPA). Bila kecepatan aliran masuk pada saluran (V) 60 cm/detik, debit yang diolah (Q) 0,15 m3/detik, maka penyisihan tingkat kekeruhan yang optimal diperoleh dari bak prasedimentasi dengan dimensi: panjang 12 meter, lebar 6,7 meter dan tinggi 1,75 meter, dengan syarat pembuangan lumpur harus dilakukan secara periodik dan teratur sesuai dengan perencanaan, yaitu setiap 3 hari. Aliran air harus dijaga agar tetap tenang /tidak bergejolak (laminer) sehingga tidak mengganggu proses pengendapan secara gravitasi.

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Soil aquifer treatment using advanced primary effluent

Water Science & Technology ◽

10.2166/wst.2011.663 ◽

2011 ◽

Vol 64 (3) ◽

pp. 640-646 ◽

Cited By ~ 13

Author(s):

Saroj K. Sharma ◽

Mustefa Hussen ◽

Gary Amy

Keyword(s):

Wastewater Treatment ◽

Soil Column ◽

Treatment Options ◽

Suspended Solid ◽

Head Loss ◽

Soil Aquifer Treatment ◽

Effective Option ◽

Attractive Option ◽

Pre Treatment ◽

Sedimentation Basins

Soil aquifer treatment (SAT) using primary effluent (PE) is an attractive option for wastewater treatment and reuse in many developing countries with no or minimal wastewater treatment. One of the main limitations of SAT of PE is rapid clogging of the infiltration basin due to high suspended solid concentrations. Some pre-treatment of PE before infiltration is likely to reduce this limitation, improve performance of SAT and help to implement this technology effectively. The effects of three pre-treatment options namely sedimentation (SED), coagulation (COAG) and horizontal roughing filtration (HRF) on SAT were analyzed by conducting laboratory-scale batch and soil column experiments. The sedimentation and coagulation pre-treatments led to less head loss development and reduction of clogging effect. The head loss development in soil column using PE + COAG and PE + SED was reduced by 85 and 72%, respectively, compared to PE alone without any pre-treatment. The overall dissolved organic carbon (DOC) removal of pre-treatments and soil column collectively were 34, 44, 51 and 43.5% for PE without any pre-treatment, PE + SED, PE + COAG and PE + HRF, respectively. Coagulation pre-treatment of PE was found to be the most effective option in terms of suspended solids, DOC and nitrogen removal. Sedimentation pre-treatment of PE could be attractive where land is relatively less expensive for the construction of sedimentation basins.

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Characterizing and modelling the trapping efficiency of sedimentation basins downstream of harvested peat bog

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2017-0330 ◽

2018 ◽

Vol 45 (6) ◽

pp. 478-488 ◽

Cited By ~ 1

Author(s):

Myriam Samson-Dô ◽

André St-Hilaire

Keyword(s):

Suspended Sediment Concentration ◽

Suspended Sediments ◽

Sediment Concentration ◽

Drainage Water ◽

Organic Content ◽

Trapping Efficiency ◽

Peat Moss ◽

Decomposition Level ◽

In Series ◽

Sedimentation Basins

Peat moss harvesting is an important industry in Canada. To harvest peat, the water table of the peatland must be lowered to allow the surficial peat layer to dry and be harvested. Drainage water can contain suspended sediments, so at most harvesting sites, the water is routed through sedimentation basins. This work focuses on characterizing and modelling their trapping efficiency. Eight basins with different volume/watershed area ratios (705 to 4170 m3/km2) were studied in three Quebec regions. Suspended sediment concentration and discharge were monitored up- and downstream of each basin during the ice-free season. Basins with high ratios of volume/drainage area, multiple basin configurations (i.e., two basins in series or in parallel), and those equipped with a flow regulation structure were more efficient than regular basins. Moreover, the nature of sediments (size, decomposition level, and organic content) influences loads, but not the trapping efficiency. Finally, two empirical models developed to predict trapping efficiency of municipal sedimentation basins were tested and adapted for basins that capture peat sediments.

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