Assessment of aeration basin performance efficiency: sampling methods and tank coverage

Iranpour, R.; Magallanes, A.; Zermeño, M.; Varsh, V.; Ali, Ahmad; Stenstrom, Michael K.

doi:10.1016/s0043-1354(00)00065-8

Cited by 19 publications

(10 citation statements)

References 7 publications

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“…Typical U values are between 1.015 and 1.040 with 1.024 being the ASCE standard [20]. Salts and particulates in wastewater both impact on the oxygen transfer rate.…”

Section: Oxygen Transfermentioning

confidence: 99%

Performance of bench-scale membrane bioreactor under real work conditions using pure oxygen: viscosity and oxygen transfer analysis

Rodríguez

Martı́nez-Toledo

González‐López

et al. 2010

Bioprocess Biosyst Eng

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Pure oxygen to supply the aerobic condition was used in the performance of a bench-scale submerged membrane bioreactor (MBR). The pilot plant was located in the wastewater treatment plant of the city of Granada (Spain) and the experimental work was divided into two stages (Unsteady state and steady state conditions). Operation parameters (MLSS, MLVSS and dissolved oxygen concentration) and physical characteristics (temperature, conductivity, pH, COD and BOD(5)) were daily monitored. The results showed the capacity of the MBR systems to remove organic material under a hydraulic retention time of 18.46 h and sludge retention time of 18.6 days. Therefore, Viscosity of the sludge and alphakLa-factor of the aeration, were determinate in the steady stage condition to understand the behavior of the system when pure oxygen has been used to supply the aerobic conditions of the MBR system showed an alpha-factor of 0.238 when the viscosity of the system was 4.04 Cp.

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“…Typical U values are between 1.015 and 1.040 with 1.024 being the ASCE standard [20]. Salts and particulates in wastewater both impact on the oxygen transfer rate.…”

Section: Oxygen Transfermentioning

confidence: 99%

Performance of bench-scale membrane bioreactor under real work conditions using pure oxygen: viscosity and oxygen transfer analysis

Rodríguez

Martı́nez-Toledo

González‐López

et al. 2010

Bioprocess Biosyst Eng

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“…Since 1991, the Research Group of the Bureau of Sanitation of the City of Los Angeles (BOS) and the University of California, Los Angeles (UCLA) have collaborated on studies of oxygen transfer efficiency (OTE) at wastewater treatment plants operated by BOS (Iranpour et al, 1997a, 1997b, 1997c, 1998a, 1998b, 1998c, and 1999b, and Stenstrom et al, 1991, 1992, 1993, and 1994. These studies have assessed air flow and diffuser performance to gain insight to power consumption and the relative value of differing types of diffusers and cleaning methods, with the goal of eventually reducing costs of secondary treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Recent work at TWRP has been done with some innovations in sampling (Iranpour et al, 1997a(Iranpour et al, , 1997b(Iranpour et al, , 1997c(Iranpour et al, , 1998a(Iranpour et al, , 1998b(Iranpour et al, , 1998c(Iranpour et al, , 1999a(Iranpour et al, , 1999b(Iranpour et al, , and 1999c). More closely spaced and comprehensive sampling has permitted observations of aspects of aeration system performance that were not evident in previous research with more widely spaced samples (Redmon et al, 1983, and Stenstrom et al, 1991, 1992, 1993, and 1994.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Aeration System Performance Efficiency: Frequent Sampling for Damage Detection

Iranpour¹,

Magallanes²,

Zermeño³

et al. 2000

Water Environment Research

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A study of oxygen transfer efficiency (OTE) in aeration basins, using measurements of oxygen depletion in offgas collected from them, was carried out over a period of several years by collaborations between the University of California, Los Angeles and the Bureau of Sanitation Research Group of the City of Los Angeles. Measurements were taken of dissolved oxygen (DO), water temperature, oxygen depletion, and air flux at each sampling location as part of the process to obtain standardized OTE. Field instruments, permanently located near the tanks and galleries, are connected to the control room that automatically records return activated-sludge flow, influent flow, tank DO sensor readings, and air flow. Data from the control room and field instruments were collected for the times of the samples to provide context and some degree of quality control for the samples obtained by the measurement team.The combined air flux and OTE measurements not only agree with the familiar inverse relationship between OTE and air flux but have allowed detection of strong evidence that serious leakage has developed in a few weeks in the air distribution systems of tanks 4 and 5, which was indirectly confirmed by observation of water ejection from the air release valves on the tanks. However, the detail provided by OTE measurements allows more specific understanding of the magnitude of the problem and its significance for the operation of these tanks. Analysis of the OTE measurements made at the site since 1991 also indicates that the diffusers in some of the tanks may now be in need of cleaning or replacement. Water Environ. Res., 72, 363 (2000).

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“…Typical ϕ values are between 1.015 and 1.040, with 1.024 being the ASCE standard. [18] Both biomass characteristics and the design of the aeration system had an influence on the oxygen transfer. [11] Furthermore, the interrelationships developed between aeration and different facets and parameters of the system are complex.…”

Section: Determination Of the Oxygen Transfer Efficiency (Alpha Factor)mentioning

confidence: 99%

Influence of sludge retention time and temperature on the sludge removal in a submerged membrane bioreactor: Comparative study between pure oxygen and air to supply aerobic conditions

Rodríguez

Leyva‐Díaz

Reboleiro-Rivas

et al. 2013

Journal of Environmental Science and Health, Part A

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Performance of a bench-scale wastewater treatment plant, which consisted of a membrane bioreactor, was monitored daily using pure oxygen and air to supply aerobic conditions with the aim of studying the increases of the aeration and sludge removal efficiencies and the effect of the temperature. The results showed the capacity of membrane bioreactor systems for removing organic matter. The alpha-factors of the aeration were determined for six different MLSS concentrations in order to understand the system working when pure oxygen and air were used to supply aerobic conditions in the system. Aeration efficiency was increased between 30.7 and 45.9% when pure oxygen was used in the operation conditions (a hydraulic retention time of 12 h and MLSS concentrations between 4,018 and 11,192 mg/L). Sludge removal efficiency increased incrementally, from 0.2 to 1.5% when pure oxygen was used at low sludge retention time and from 1.5% to 15.4% at medium sludge retention time when temperature conditions were lower than 20°C. Moreover, the difference between calculated and experimental sludge retention time was lesser when pure oxygen was used to provide aerobic conditions, so the influence of the temperature decreased when the pure oxygen was used. These results showed the convenience of using pure oxygen due to the improvement in the performance of the system.

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Assessment of aeration basin performance efficiency: sampling methods and tank coverage

Cited by 19 publications

References 7 publications

Performance of bench-scale membrane bioreactor under real work conditions using pure oxygen: viscosity and oxygen transfer analysis

Performance of bench-scale membrane bioreactor under real work conditions using pure oxygen: viscosity and oxygen transfer analysis

Assessment of Aeration System Performance Efficiency: Frequent Sampling for Damage Detection

Influence of sludge retention time and temperature on the sludge removal in a submerged membrane bioreactor: Comparative study between pure oxygen and air to supply aerobic conditions

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