Performance relationships for primary sedimentation

Tebbutt, T.H.Y.; Christoulas, D. G.

doi:10.1016/0043-1354(75)90180-3

Cited by 31 publications

(24 citation statements)

References 1 publication

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“…The test results support an important conclusion -namely, that as documented by previous researchers (Tebutt and Christoulas, 1975;Wahlberg et. al., 1998), the overall TSS removal efficiency is a poor indicator of performance.…”

Section: Plant a Plant Bsupporting

confidence: 86%

A New Approach for Defining the Limits of Chemically Enhanced Primary Treatment

Narayanan¹,

Karam²,

Leveque³

et al. 2000

proc water environ fed

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As more plants begin to experiment with chemically enhanced primary treatment (CEPT) and report their results, it is becoming clear that there is considerable variation in the degree of enhancement seen with CEPT at different plants. The primary reason for this is likely the difference in the wastewater characteristics, and in particular, the differences in the particle weight distributions at different plants. There has not been much work done in this area to characterize these differences or to investigate their impact on CEPT. The jar tests that are commonly used to evaluate the efficacy of CEPT provide valuable information on the extent of removal possible; however, they do not help explain why the achievable removals vary from plant to plant. This paper presents a procedure based on particle weight distribution tests that helps explain the rationale behind the removal efficiencies achievable with and without CEPT. The procedure can be used as a predictive and diagnostic tool to evaluate primary treatment performance. This approach was used in a full-scale evaluation of CEPT at the 88-million gallon per day (mgd) Clark County Sanitation District (CCSD) wastewater treatment plant in Las Vegas, Nevada.

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Section: Plant a Plant Bsupporting

confidence: 86%

A New Approach for Defining the Limits of Chemically Enhanced Primary Treatment

Narayanan¹,

Karam²,

Leveque³

et al. 2000

proc water environ fed

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“…In order to optimize the design and assessment of PSTs, it is necessary to determine their pollutant removal efficiency as a function of the geometric and operating characteristics of the settling tank and the solids concentration of the fed suspension. Some surveys [1,3,6,18,[32][33][34][35] showed the effects of SS concentration in raw wastewater, temperature, and some operating characteristics, such as HRT or q, on the performance of PSTs. These studies provided simplified the empirical mathematical models to describe the average removal of wastewater pollutants that are helpful in the design of sedimentation tanks or to predict the behavior of sedimentation tanks under certain operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Model of Suspended Solids Removal in the Primary Sedimentation Tanks for the Treatment of Urban Wastewater

Jover-Smet

Martín-Pascual

Trapote

2017

Water

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Primary settling tanks are used to remove solids at wastewater treatment plants and are considered a fundamental part in their joint operation with the biological and sludge treatment processes. The aim of this study was to obtain a greater understanding of the influence of operational parameters, such as surface overflow rate, hydraulic retention time, and temperature, on the removal efficiency of suspended solids and organic matter by the measurement of chemical oxygen demand and biochemical oxygen demand in the primary sedimentation process. The research was carried out in a semi-technical primary settling tank which was fed with real wastewater from a wastewater treatment plant. The physical process was strictly controlled and without the intervention of chemical additives. Three cycles of operation were tested in relation to the surface overflow rate, in order to check their influence on the different final concentrations. The results obtained show that the elimination efficiency can be increased by 11% for SS and 9% for chemical oxygen demand and biochemical oxygen demand, for variations in the surface overflow rate of around ±0.6 m 3 /m 2 •h and variations in hydraulic retention time of around ±2 h. The results also show that current design criteria are quite conservative. An empirical mathematical model was developed in this paper relating SS removal efficiency to q, influent SS concentration, and sewage temperature.

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“…It should be noted that Equation 3 was not used by Tebbutt and Christoulas (1975) to develop their primary clarifier performance equations, and it is not clear from their paper whether the equation refers to the performance of a batch settling operation or a continuous flow settler. The latter was assumed as τ ("t" in their paper) was identified in the paper's Nomenclature section as "retention time."…”

Section: Process Objective and Factors Affecting Performancementioning

confidence: 96%

Primary Clarifier Design Concepts and Considerations

Wahlberg¹,

Stallings²,

Appleton³

2005

proc water environ fed

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Because the process objective is more appropriately focused on the clarified liquid rather than the thickened underflow, the unit operation discussed herein is referred to as primary clarification and the units themselves as primary clarifiers. The objective of the primary clarifier chapter in WEF's updated Clarifier Design Manual is to move away from empiricism and towards something more rational and, at the same time, practical. In meeting this objective, emphasis is placed on understanding primary clarifier performance, focusing on the process objective of primary clarifiers and factors affecting their performance. This understanding is tantamount to good primary clarifier design. Two case studies are given demonstrating the approach.

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Performance relationships for primary sedimentation

Cited by 31 publications

References 1 publication

A New Approach for Defining the Limits of Chemically Enhanced Primary Treatment

A New Approach for Defining the Limits of Chemically Enhanced Primary Treatment

Model of Suspended Solids Removal in the Primary Sedimentation Tanks for the Treatment of Urban Wastewater

Primary Clarifier Design Concepts and Considerations

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