Olfactory Quantification of Sewage Odors

Koe, Lawrence C. C.; Brady, D.K.

doi:10.1061/(asce)0733-9372(1986)112:2(311)

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…1 For example, by using the dilution-to-threshold concept, the odour concentration of an air sample can be expressed in terms of standard odour units per cubic metre (sou/m 3 ). For sewage air such as that present within the wetwell of a sewage pumpstation, the overall magnitude of sewage odour concentration exerted by the air mixture can be estimated if the concentration of the gaseous hydrogen sulphide (H 2 S) component is known.…”

Section: Odour Concentration Estimationmentioning

confidence: 99%

Assessment of odorous emissions from sewage pumpstations

Koe

Brady

1986

International Journal of Environmental Studies

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Assessment of the impact of odours released from sewage pumpstations requires the consideration of a number of factors. These include the determination of the odour emission rate or source strength of the pumpstation, the dispersion of odorous air from the station and the response of the human nose to sewage odour. By using the dilution-to-threshold concept, the odour concentration of ambient air can be quantified in terms of standard odour units per unit volume. Taking into account the rate of odorous air emitted from a sewage pumpstation, the odour source strength of the station can be conveniently expressed in terms of standard odour units per unit time. Field measurements were carried out at ten sewage pumpstations and the results of these investigations indicate that odour emission rates tend to increase with the 1.3 power of the sewage flowrate. Thus, the potential odorousness of a sewage pumpstation is dramatically increased with increasing flowrates. However, because the magnitude of observed change in odour intensity by the human nose is logarithmically related to the magnitude of the odour concentration, perceived odour intensities in the neighbourhood of pumpstations that receive increased flowrates, increase less dramatically.

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Section: Odour Concentration Estimationmentioning

confidence: 99%

Assessment of odorous emissions from sewage pumpstations

Koe

Brady

1986

International Journal of Environmental Studies

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“…Yet air movement is one of the determining factors in odour and corrosion problems (Koe and Brady 1986). Odour problems can be a major issue for system owners and can be difficult to fix (e.g.…”

Section: Introductionmentioning

confidence: 99%

Sewer Ventilation Modeling

Lowe

2017

JWMM

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A model of sewer ventilation was developed using a relationship between the water and air velocities. SWMM hydraulic output was used to compute the water velocity and flow depth. The flow depth is used to compute the headspace area. In conjunction with the calculated air velocity this allows the air flow rate to be computed. The model was calibrated and validated using five studies that included data from collection systems in four cities, plus two experimental setups. The results showed that the model was able to reasonably reproduce the measured data over a large range of air flow rates-from <10 m 3 /h to 5 000 m 3 /h.

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“…Although there is a wide range of chemical species found in odorous air associated with wastewater, hydrogen sulfide is a major constituent and has known odor characteristics (Ando, 1980, andKeddie, 1982). Gaseous hydrogen sulfide concentration has been found to correlate well with direct odor measurement at wastewater treatment plants (Koe and Brady, 1986). However, even with a suitable parameter known to be correlated to odor, sampling must still be conducted over an extended period of time to fully characterize an odor problem.…”

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confidence: 99%

Quantification of wastewater odors by the affected public

Aitken¹,

Okun²

1992

Water Environment Research

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Odors associated with wastewater collection and treatment are a common problem. Wastewater odors are difficult to quantify, and current methods of quantification are too cumbersome to permit long‐term evaluation of odor problems. In this project, residents in affected neighborhoods near a treatment plant in Winston‐Salem, North Carolina quantified odors by completing numerical odor rating forms three times a day for six months. The resulting database was used to evaluate the correlation of odors to a variety of factors. Residents from the same neighborhood had a high level of agreement in quantifying odors, and most participants had a reasonable ability to make distinctions among different degrees of odor. Odors correlated well with wastewater characteristics (for example, influent COD) and wind direction, implicating the treatment plant as the major source of odors in affected neighborhoods. Use of the numerical odor rating form was an effective and inexpensive means of quantifying wastewater odors, and in conjunction with other information gave a better picture of specific major sources of odor at the treatment plant.

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Olfactory Quantification of Sewage Odors

Cited by 9 publications

References 1 publication

Assessment of odorous emissions from sewage pumpstations

Assessment of odorous emissions from sewage pumpstations

Sewer Ventilation Modeling

Quantification of wastewater odors by the affected public

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