Development of a design factor for activated sludge sedimentation tank design based on batchsettling data

Abstract

A simple technique is presented to obtain a design factor for activated sludge sedimentation tank design to account for periodic changes in slurry settling characteristics. Currently, only changes in hydraulic and solids loading are typically accounted for during design. The technique presented is based on performing repetitive batch settling tests, the results of which were used to relate slurry concentration to settling velocity for a municipal activated sludge system through the first-order Vesilind equation (V = V0 exp (-KC)). The parameters V0 and K of the Vesilind equation were calculated by non-linear least squares parameter estimation. The value of the operating flux (G0 ) was then calculated and was used as a representation of the settling characteristics for each set of data. A statistical analysis was then performed to describe the distribution of G0 values collected over an approximately 6-month period. The distribution of the G0 values was found to be log normal.From the results of the distribution analysis, safety factors were determined for various required levels of confidence. The results of this study can be used for activated sludge sedimentation tank design by applying the same statistical distribution to a single data point which is assumed to be descriptive of average settling characteristics. For a 95 percent level of confidence the value of this design factor was approximately 1.85.

Notes

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Graduation Date

1992

Semester

Fall

Advisor

Dietz, John D.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Civil and Environmental Engineering

Degree Program

Environmental Engineering

Format

PDF

Pages

99 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0029747

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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