Comparison of the 1D flux theory with a 2D hydrodynamic secondary settling tank model

Water Science and Technology

Volumn 50, Issue 7, 2004, Pages 195-204

  Ekama, G A ^a   Marais, P ^b  

^a UNIVERSITY OF CAPE TOWN   (South Africa)

^b NONE   (South Africa)

Author keywords

2D modelling; Flux theory; Full scale stress tests; Secondary settling tanks; Settling tank capacity

Indexed keywords

COMPUTER SIMULATION; HYDRAULICS; HYDRODYNAMICS; LOADING; ONE DIMENSIONAL; OPTIMIZATION; STRESS ANALYSIS;

HYDRAULIC LOADING RATES (HLR); SECONDARY SETTLING TANKS (SST); SOLID LOADING RATES (SLR); SURFACE OVERFLOW (SOR);

SETTLING TANKS;

LIQUID-SOLID SEPARATION; MATHEMATICAL MODELING; SETTLING TANK; SUSPENDED LOAD; WASTEWATER TREATMENT;

ACCURACY; ARTICLE; CALCULATION; CONCENTRATION RESPONSE; CONTROLLED STUDY; EFFLUENT; HYDRODYNAMICS; INTERMETHOD COMPARISON; PREDICTION; PROCESS OPTIMIZATION; SENSITIVITY ANALYSIS; SIMULATION; SLUDGE SETTLING; STRESS; THEORY; VALIDATION PROCESS; WASTE WATER MANAGEMENT;

EID: 7944223017     PISSN: 02731223     EISSN: None     Source Type: Journal    
DOI: 10.2166/wst.2004.0454     Document Type: Article

References (15)

1. de Haas, D.W., Wentzel, M.C., Gaydon, P. and Ekama, G.A. (1998). Use of simultaneous chemical precipitation in modified activated sludge systems exhibiting enhanced biological phosphorus removal. Research Report W98, Dept. of Civil Eng., Univ. of Cape Town.
2. Ekama, G.A. and Marais, G.v.R. (1986). Sludge settleability and secondary settling tank design procedures. Water Pollution Control, 85(1), 101-113.
3. Ekama, G.A., Barnard, J.L., Günthert, F.W., Krebs, P., McCorquodale, J.A., Parker, D.S. and Wahlberg, E.J. (1997). Secondary settling tanks: Theory, design, modelling and operation. IAWQ STR No 6, pp216, International Association on Water Quality, London.
4. Ekama, G.A. and Marais, P. (2002). Hydrodynamic modelling of secondary settling tanks Part 1 - Application of a hydrodynamic model to full scale secondary settling tanks, Final report to Water Research Commission on contract K5/835, Report K5/835/1/02, WRC, PO Box 824, Pretoria, 0001, RSA.
5. Göhle, F., Finnson, A. and Hultman, B. (1996). Dynamic simulation of sludge blanket movements in a full scale rectangular sedimentation basin. Wat. Sci. Tech., 33(1), 89-99.
6. Marais, P. and Ekama (2001). Comparison of the 1D idealized flux theory and a 2D hydrodynamic model with full scale secondary settling tank performance data. Research Report No W111, Dept of Civil Eng., Univ. of Cape Town, Rondebosch, 7701, Cape, RSA.
7. McCorquodale, J.A. and Zhou, S.P. (1993). Effects of hydraulics and solids loading on clarifier performance. J. Hydraulic Res., IAHR, 31(4), 461-478.
8. 2O, 15(14), 344-354.
9. STOWa (Stichting Toegepast Onderzoek Waterbeheer) (1981). Hydraulische en technologische aspecten van het nabezink-process. Rapport 1 - Literatuur (1981a); Rapport 2 - Ronde nabezinktanks (Praktijkonderzoek) (1981b); Rapport 3 - Ronde nabezinktanks (Inventarisatie en bedrijfservaring) (1981c). Postbus 8090, RB 3505, Utrecht, Holland.
10. Takács, I., Patry, G.G. and Nolasco, D. (1991). Adynamic model for clarification thickening process. Water Research, 25 10), 1263-1271.
11. Wahlberg, E.J., Gerges, H.Z., Gharagozian and Stenstrom, M.K. (1998). Discussion on "Secondary clarifier analysis using data from the Clarifier Research Technical Committee protocol" by Vitasovic, Z.C., Zhou, S., McCorquodale, J.A. and Lingren, K. (1997). Water Environment Research, 69(5), 999-1007, Water Environment Research, 70(2), 249-253.
12. Watts, R.W., Svoronos, S.A. and Koopman, B. (1996). One dimensional modelling of secondary clarifiers using a concentration feed velocity dependent dispersion coefficient. Water Research, 30 9), 2112-2124.
13. WRC (1984). Theory, design and operation of nutrient removal activated sludge processes (Chapter 8), Water Research Commission, PO Box 824 Pretoria, 0001, RSA.
14. Zhou, S., McCorquodale, J.A. and Vitasovic, Z. (1992). Influences of density on circular clarifiers with baffles. J. Environ. Engrg., ASCE, 118(6), 829-847.
15. Zhou, S., Pfeil, R., Strand, E., Ji, Z. and Vitasovic, C. (1998). SettlerCAD (formerly Clarity) Release 1.1 - A 2D hydrodynamic model for secondary clarifiers. Reid Crowther Consulting, Seattle, WA.