Determination of volatile matter reduction in sludge is complicated because of the changes occurring during sludge digestion.
The calculation used to determine percent volatile matter (VM) reduction is
[%VMin – %VMout] X100
% of Volatile Matter Reduction (VM) = ——————————-
[%VMin – (%VMin X % VMout)]
Using the digester data provided below, Determine [....]
Measurement of Sediment oxygen demand (SOD) is a measure of the oxygen demand characteristics of the bottom sediment which affects the dissolved oxygen resources of the overlying water. To measure SOD, a bottom sample is especially designed to entrap and seal a known quantity of water at the river bottom. Changes in DO concentrations (approximately 2 h, or until the [....]
Determination of Phosphate
The neutralized sample is reacted with ammonium molybdate and stannous chloride.the blue color obtained is matched against that produced with a series of standard phosphate solution, visually or with spectrophotometer at 690mu.
1.Phenolphthalein indicator solution
2.Approximately 4N sulfuric acid
3.Ammonium Molybdate Solution
4.Standard Phosphate solution
To a 50 ml.sample containing not more than 0.15mg.of phosphate(as [....]
This example in connection with our previous post,
How to calculate Aeration Tank Volume?
Total BOD to be removed (Influent) = 250 mg/l (assume) x 1400 = 350 kg/Day (we consider 1400 M3/Day Effluent Plant)
Hence O2 to be transferred =350 kg/Day
Method of Aeration = Fine Bubble Diffuser
SOTE (Standard O2 Transfer Efficiency For 300
Dear reader, due to some heavy work.we couldn’t touch with u last few months, OK.
Now we see as an with small example!
Influent BOD: 250mg/l(after 30% reduction in the Physio-chemical treatment followed by primary clarifier
Process selected: Activated sludge process
F/M (Food/Microbes) =0.15
MLSS (Mixed Liquor Suspended Solids)=3000 mg/l
Calculation of Aeration Tank Volume: [....]
Chlorine deactivates microorganisms through several mechanisms that can destroy most biological contaminants, including:
- Damaging the cell wall
- Altering the permeability of the cell (the ability to pass water in and out through the cell wall) • Altering the cell protoplasm
- Inhibiting the enzyme activity of the cell so it is unable to use its food to produce energy