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This program designs the pipe that will be used for the sedimentation tank sludge drainage. The sludge drain runs along the bottom of the sedimentation tank and collects the flocs as they fall from the lamella.

Sludge Drain Design Algorithm

Sludge Drain Inputs
Sludge Drain Outputs
Sludge Drain AutoCAD Drawing Program

Algorithm

Given the maximum flow rate through the treatment plant, and The number of sludge drains is determined by the number of sedimentation tanks sloped pairs in the sedimentation tanks. This is defined as N.SedSludge, and uses the number of slope pairs calculated in the Sedimentation Inlet Slopes program.

Next, the plant, the flow rate for each sedimentation tank is determined. With a constant orifice spacing of 10 cm, and the given length of the sedimentation tank, the exact number of orifices in the pipe can be calculated : Image Removed
With the drainage time set at 30 mingiven the orifice spacing from the Design Assumptions, and the dimension values given by the water level at the sedimentation tank, the width and length of the sedimentation tank, the initial drain flow rate is estimated: Image Removedgiven length of the sedimentation tank from the Sedimentation program.

The initial flow rate through the sludge drain is calculated using values found in the Sedimentation program, and the drainage time for the sedimentation found in the Design Assumptions program.

The diameter of the sludge drain pipe is estimated through an iterative process, using the ND.Manifold equation found in the Fluids Functions program.

The diameter of the pipe is estimated through an iterative process, given the pipe database, the flow rate ratio, Q_ratio, and the following equation:

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