How to calculate a mud index?

How to calculate a mud index?

For calculate the IB, the volume of the mud in ml/l is divided by the dry matter concentration of the mud (g/l). The unit of the BI is therefore ml/g. Typical values ​​for municipal sewage treatment plants are between ml/g.

How to calculate the age of sludge?

L’Sludge age : A: It corresponds to the ratio of the quantity of sludge present, in kg DM, in the aeration basin (S) on the quantity of sludge in excess (E) to be evacuated per day, in kg DM/d.

How to calculate Hazen’s speed?

According to this model, a particle of speed of fall Vc settling on a height H is retained in a basin of length L and of horizontal surface S crossed by a flow Q if: Vc 2 Vh, with Vh (hazen speed) = Q/S.

How to calculate the dryness of sludge?

The measurement method consists in placing in an oven at 105°C, until a constant mass is obtained, a sample of mud ( mL depending on the concentration of the mud). Let M1 be the mass of the wet sample and M2 its mass after drying.

How to calculate the Mohlman index?

Method of determination The sludge is allowed to settle in the test tube, then the volume of sludge settled after 30 minutes is noted and the dry residue is weighed. The value ofindex is obtained by dividing the volume of sludge by the weight of the dry residue (with the correct choice of units).

What information can we draw from the Mohlman index?

L’Mohlman index Im intended primarily for the characterization of biological sludge. For the same mud, theMohlman index depends partly on the geometric characteristics of the test specimen, but above all on the initial concentration of sludge.

How to calculate the settling yield?

The settleable mass flux is given by the Kynch curve. For a particular point of the Kynch curve, of concentration Ci, the velocity Vi of settling is given by the tangent at this point. The corresponding flux is Fi = Ci · Vi.

How to measure suspended solids?

The mass of suspended matter is obtained by taking the difference between the mass of the filter including the dried residues and the initial mass of the filter, while taking into account the filtered volume.

How to measure BOD5?

For measure BOD5we realize a first measure the oxygen concentration of a water sample. We repeat this measure 5 days later. The BOD5 represents the difference between the two concentrations measured. The measurements are carried out using the ExAO device.

How to make slime?

Make normal slime Find a place to make your slime. It is best to find a field of fertile, open, grass-free soil. Dig the earth. If you want to have a deep mud field, start by digging trenches, furrows and holes deep in the earth.