Hydraulic performance of a deep wastewater stabilization pond

Torres, Juan J.; Soler, Antonio; Sáez, J.; Ortuño, J.

doi:10.1016/s0043-1354(96)00293-x

Cited by 35 publications

(18 citation statements)

References 9 publications

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“…It has been argued that the occurrence of stratification is undesirable in WSP because it causes a reduction in the effective volume for treatment and encourages hydraulic short-circuiting (Torres et al, 1997;Kellner and Pires, 2002); this may be the case if the inlet is located close to the surface. However the pilot-scale ponds at Esholt, which have their inlet positioned closer to their base than their surface, consistently achieved very high removals of BOD and SS (Abis, 2002;Abis and Mara, 2003) despite the very long periods of thermal stratification.…”

Section: Correlation Between Mean Pond Water-column Temperature and Amentioning

confidence: 99%

Temperature Measurement and Stratification in Facultative Waste Stabilisation Ponds in the UK Climate

Abis

Mara

2006

Environ Monit Assess

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Temperature measurements were taken at three pilot-scale facultative ponds located at Esholt wastewater treatment works in West Yorkshire, UK over two one-year periods. The measurements were taken at different depths using a technology called Thermochron iButton. The iButton readings were compared with temperature measurements taken by a YSI sonde probe and maximum/minimum thermometers: they were found to be within 1 .C. In the temperature range 3.18 .C the mean weekly and monthly air temperatures were found to be good predictors for the mean weekly and monthly pond water-column temperatures. The level of stratification in the ponds under UK climatic conditions was assessed; the data revealed that the ponds remained thermally stratified for significant periods during the year despite their shallow depth.

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Section: Correlation Between Mean Pond Water-column Temperature and Amentioning

confidence: 99%

Temperature Measurement and Stratification in Facultative Waste Stabilisation Ponds in the UK Climate

Abis

Mara

2006

Environ Monit Assess

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“…Factors that in¯uence the hydraulic performance in ponds are mainly related to shape, including baes (Mangelson & Watters, 1972;Thackston et al, 1987); topography (Somes, Bishop, & Wong, 1997;Knight & Iverson, 1990); vegetation (Moshiri, 1993;Somes et al, 1997;Kadlec, 1990);¯ow (Mangelson & Watters, 1972;Adamsson, Persson, & Lyngfelt, 1999); location of inand outlets (Mangelson & Watters, 1972, Ta & Brignal, 1998; wind (Shaw, Watt, Marsalek, & Anderson, 1997;Kadlec & Knight, 1996); and temperature (Marecos de Monte & Mara, 1987;Torres, Soler, Saez, & Ortuno, 1997). Other research eorts have focussed on de®ning hydraulic eciency (Persson, Somes, & Wong, 1999).…”

Section: Research On Pond Hydraulicsmentioning

confidence: 99%

The hydraulic performance of ponds of various layouts

2000

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This study analyses how the hydraulic performance diers between 13 ponds with hypothetically dierent layouts. The paper also includes a discussion of short-circuiting, hydraulic eciency and suitable parameters for measuring hydraulic performance. The ponds were studied by using a 2-D vertically integrated numerical model. Tracer studies were simulated and then evaluated and compared. The results con®rm that length-to-width ratio, location of in-and outlets, and subsurface berm have a large impact on pond hydraulic performance. There is also an indication that an island placed in front of the inlet improves the hydraulic performance, and that a curved pond or an island placed near the side does not decrease the performance. Ó

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“…An amount of 250 g of Rhodamine B diluted in 20 L of water was injected into the reservoir influent (under perfectly mixed conditions, a tracer concentration of 3 mg L À1 should be obtained into the reservoir). Composite water samples of 1 L were taken at outlet every 6 h during 40 d. The samples were filtered trough a glass-fiber filter, fluorescence was measured with a SPEX 111 spectrofluorometer selecting as maximum excitation and emission wavelengths 535 and 574 nm, and Rhodamine B concentration was calculated from a calibration curve between 3.0 Â 10 À10 and 2.0 Â 10 À8 , with a detection limit of 10 À10 mol À1 (Torres et al, 1997). According to Levenspiel (1972), the actual mean residence time in the reactor was computed as the time t (h) (h in hours) corresponding to the centroid of the residence time distribution (RTD) curve:…”

Section: Procedures To Calculate Mrt%fementioning

confidence: 99%