be submerged in the water to be treated or even in the sludge blanket : Zeeweed series 500 modules. These modules consist of layers of reinforced fibres with resin potted upper sections. These fibres can...

a settling tank having a section S, fed with an incoming flow QE with a suspended solids concentration CE; sludge is drawn off from the bottom of the settling tank at a flow rate of QS with a concentration CS...

the solution prepared in order to achieve a uniform dispersion of the polymer through the water or previously coagulated sludge; therefore, this dilution will depend on polymer and sludge viscosity...

extracted from the water with the floc (sludge). In order to achieve a good PAC utilisation, we recommend using a sludge recirculation settling tank (Densadeg) or a sludge blanket settling tank (Pulsator...

, Densadeg clarifier must be designed on the basis of solids loading, not treatment velocity, given the large amounts of sludge created. Another method consists in carrying out a thorough treatment...

voluminous to allow the floc to be separated in a flotation unit or through filters. In direct filtration mode, a reduced amount of coagulant may also be used. sludge production The formation of metal...

; the sludge is recovered for recycling to the screening unit and the overflow is then routed to the plant’s general wastewater treatment system. lead produced by recycling car batteries This constitutes...

-incorporation into the process: sedimentation sludge, even biological sludge to the paperboard industry; oils from food refineries and margarine producers to soap makers...; grease and proteins from abbatoirs...

to be eliminated (see suspended growth (activated sludge) process page 3). carbonaceous pollution In general, carbonaceous pollution is the main pollution that needs to be eliminated. It is also the main...

that will settle and coagulate; and we shall see in the section suspended growth (activated sludge) process that denitrification of biological phosphorus removal will in turn depend on fractions that can be easily...

wastewater treatment. submerged membrane bioreactors The membranes are placed directly into the activated sludge. The membranes will be hollow or flat, organic, called external skin membranes (filtration...

; or into a zone containing a nozzle system, Where it comes into contact with the pressurised water after pressure relief (4). The floated sludge is extracted through the opposite end (7) by a scraper bridge (5...

solids, or little bacterial floc obtained from activated sludge. Its suspension is prepared and distributed in the same way as calcium carbonate. ferrous sulphate Ferrous sulphate is used to precipitate...

jeopardise water and sludge treatment effectiveness, or at least complicate treatment implementation and operation. The same screens are sometimes used to remove fibres from sludge. The operation is more...

(including tastes and odours) Optimising coagulation Injecting PAC upstream from the sludge blanket clarifiers (Pulsator) for use as PAC contact medium upstream from the filter battery; at Aubergenville...

measurement C. Suspended solids concentration measurement (optical measurement) D. Top level of sludge measurement (using ultrasonics, optics or radar) E. Conductivity meter – Resistivity meter F. p...

sludge) process). Figure 5. Aquatic phosporus cycle In order to develop, algae and bacteria mainly use PO43- ions (their ability to be dissolved in water can be caused by microbial action...

) that usually includes: a sludge blanket clarifier; a sand filter; a PAC contact reactor; an Ultrafiltration UF stage; the UF backwash water is returned to the clarifier. The characteristics...

methanogenesis routes.One, from the H2/CO2 couple produces H2O the other, termed acetoclastic that breaks acetate down into CO2 and CH4. In sludge treatment for example, 70% of methane is produced via...

a thick bed of sludge. Disinfection by final chlorination Ultrafiltration Ultrafiltration using Ultrazur™ membrane filtration system including out-in filtration, gravity-feed tanks...