to 50% for mixed sludge Adapted to WWTP from 20,000 to 80,000 PE Biogas production 0.9 to 1.1 Nm3/kg of volatile suspended solids among references Weyersheim (France) – 30,000 PE...

. Thickeners and digesters of the Marseilles WWTP (France) – Capacity: 1,500,000 p.e. design The Kynch theory is used to calculate static thicknener and, in particular, to determine the surface area...

neutralising carbonic attack physical removal of CO2 Potential treatments include: cascade: ΔH = 1 to 2 m; residual = 10-15 mg CO2·L–1; sprayed: ΔH = 2 to 5 m; residual = 5-10 mg CO2·L–1...

, in the case of the cell comprising three pairs of membranes, where compartments 1, 2, 3, 4 and 5 are supplied with a sodium chloride solution, the ions in compartments 1, 3 and 5 will move to compartments 2...

that is responsible for the properties of most para and ferromagnetic substances ; the proton is a particle that has a positive charge equal to coulomb and its mass is 1 835 times that of the electron...

problem was caused by the presence of lead that had to be reduced to levels of one mg · L–1 by precipitating a basic lead carbonate. Sludge separation was carried out using dissolved air flotation...

high losses in sludge (due to acclimatisation) and low micro-organism synthesis (0.1 to 0.2 kg VM per kg of BOD5 eliminated), it may take several months to increase the load! To reduce the cost...

); silica content [SiO2] (1° f= 12 mgl–1 SiO2); the water’s carbonic acid content and, possibly, after the carbonic acid has been removed, TCO2; volume of water V to be provided between regenerations...

of liquid to the centre of gravity of the opening (in m). The relation k = K–1/2 exists between the coefficient k used here and the coefficient K defined under minor losses in the pipelines, fittings, valves...

current that can be borne without danger is in the region of 25 mA with alternating current and 50 mA with direct current. If we take the human body’s resistance as being between 2 000 and 1 000 Ohms...

Functional identification comprises two to four upper case letters, in two parts : 1st part: first letter or variable and its modifier, which is common to all the instruments on the same loop...

major static thickening possibilities (several hundred kg · m–2 · h–1) when it is pure; for instance, carbonate removal sludge containing over 95% of CaCO3: will thicken up to approximately 200-400 g...

’s COD/BOD ratio is between 2 and 4, which is often inadequate and requires additional tertiary treatment. When the raw wastewater COD concentration is sufficiently high (approximately ≤ 2 g · L–1...

levels (measured at the copper-CuSO4 electrode) of between – 0.85 and – 1.0 V. The current density will depend on the metal surface to be protected, e.g. : 60 mA · m–2 for a bare metal grating...

standard sizes, ranging from 23 to 135 m3·h–1. When the raw water is moderately contaminated, PAC can be injected to capitalise on the advantages offered by the sludge blanket as a contact medium. ...

must be evacuated when the thickness reaches 1.50m. When correctly dimensioned, the treatment outlet corresponds to the discharge requirements in a normal zone. ...

-free treatment key figure Filtration speed up to 1,400 m/h among references As Samra (Jordan) – 3,300,000 PE ...

Weir discharge is provided by the general formula: where : Q = flow rate, in m3·s–1 (or L·s–1), μ = weir discharge coefficient, Ls = weir crest width, in m, h = water sheet height, in m...

appropriate reference used will be the surface loading density (in kg BOD · d–1 · m–2 of developed surface area) rather than the BOD loading (kg BOD · d–1·m–3). This criterion provides a better appraisal...

configuration varies according to salinity, pH, etc. . Finally, the discharge rate varies significantly depending on operating conditions … The unit outputs quoted for UF membranes range from 0.05 to 0.5 m3·h–1...