Veolia Water Solutions & Technologies Support

Otv Sa

Philippe Sauvignet

Abdelkader Gaid

Kashi Banerjee

Charles Blumenschein

Claus Dahl

Jean-Francois Beaudet

Valery Ursel

Celine Levecq

Nicolas Meudal

Hervé Paillard

Valey Ursel

Sonia Guillot

Sophie Lindegaard

Goulven Inial

Nikolai Hertfleder

Jean-François Beaudet

Céline Levecq

A system for biologically treating wastewater comprising a rotating drum disposed within a tank. Biofilm carriers are contained in the drum. One or more hollow tube aerators are secured inside the drum to a perforated wall that forms a part of the drum. As the drum is rotated within the tank, the mixing of the biofilm carriers with the wastewater therein and the action of the hollow tubes aerates the wastewater in the rotating drum.

System for the biological treatment of water and corresponding method

The invention relates to a water treatment plant comprising: means for supplying water for treatment, wherein said water has been coagulated previously, a flocculation-decantation device having means for dispensing at least one flocculant reagent, means for dispensing at least one ballast, means for extracting decantation sludge, means for discharging the treated water, means for separating said ballast contained in the ballasted sludge, and means for recycling the ballast that has been cleaned in this manner back into the flocculation-decantation device, characterised in that: said flocculation-decantation device has a single tank in the lower portion of which a stirring mechanism is arranged; wherein said single tank comprises slats in its upper portion; and said slats are separated from the stirring mechanism by a distance 'd' which is between approximately 0.5 metres and approximately 3 metres. The invention also relates to a method using said plant.

Water treatment plant having integrated ballasted flocculation and decantation, and a corresponding method

Method for treating water by filtration on a bed of granular material in order to reduce its content in contaminants, said method comprising the steps for: making said water travel in transit in a reactor containing said bed in a upward flow at a speed that does not permit the fluidization of said bed but permits said material to migrate, as and when the filtration takes place, towards the lower part of said reactor, continuously removing a fouled granular material at the foot of the reactor, by means of a piping into which a gas is insufflated, said fouled granular material being constituted by granular material and contaminants adsorbed on said granular material; continuously or intermittently carrying out the physical cleansing of said fouled granular material thus removed, so as to obtain a cleansed granular material essentially rid of said contaminants; reinjecting the granular material thus cleansed into an upper part of said bed; characterized in that the granular material is an adsorbent granular material and in that it comprises: a continuous or intermittent step for the discharging, during the filtration, of a part of the fouled granular material removed at the foot of the reactor; and a continuous or intermittent step for the introduction into the reactor, during the filtration, of fresh granular material in a quantity sufficient to compensate for the part of granular material discharged.

Method for water treatment by adsorption and filtration on a granular material bed

Method for treating water, containing organic matter characterized in that it comprises a step of adsorption of the organic matter contained in said water, in which this water is put into contact with an amagnetic ion-exchanging resin in an infinitely stirred tank (); the filtering of the mixture of water and resin within the tank () and the discharging of filtered water from this tank, the filtering being implemented through at least one screen () provided within the tank () enabling the resin to be contained in the infinitely stirred tank; the periodic cleansing of the screen () consisting of the separation, from this screen, of the saturated resin that has collected thereon; the drawing off () of saturated resin from the tank (); the regenerating () of at least a part of the saturated resin thus drawn off; the recycling () of said resin thus regenerated in the tank (); a step of ballasted coagulation/flocculation () and separation () comprising the addition of coagulant reagent (), flocculent reagent () and microballast () to the filtered water coming from the tank () leading to the formation of flocs; the separation of the formed flocs from a clarified water (); and the discharging () of the clarified water; and the discharging () of the sludges formed by the separated flocs.

Method for treating water containing organic matter using ion exchange and ballasted flocculation

A method for treating wastewater using a ballasted flocculation technique includes continuously measuring the concentration of suspended solids, organic matter or other impurities in the water to be treated prior to directing the water to be treated to a flocculation tank. Based on this measurement, the amount of ballast necessary to obtain treated water of a predetermined quality is then calculated. In the flocculation tank, ballast and a flocculating reagent are added to the water to form a water-floc mixture. The water-floc mixture is directed to a settling tank where a sludge-ballast mixture is settled. The sludge-ballast mixture is directed to a mixing tank and then to a separator to separate the ballast from the sludge. The separated ballast is directed to the flocculation tank. The separated sludge is directed to the mixing tank when the level of sludge-ballast mixture in the mixing tank is lower than a predetermined level.

Water treatment process and plant using ballasted flocculation and settling

A method of treating water to reduce pollutants comprises mixing an adsorbent reagent with the water to form a water-adsorbant reagent mixture. Thereafter, subjecting the mixture to a liquid-solids separation process that produces treated water and sludge. The method further includes contacting the water or treated water with a living aquatic organism wherein the value of at least one property of the organism is correlated to the concentration of pollutants in the water. This value is evaluated and the method entails adjusting the quantity of adsorbent reagent mixed with the water as a function of the value of the property.

Method and system for treating water in order to reduce its endocrine disrupting effect by means of a living organism

The invention relates to a method and installation for treatment of an aqueous phase containing a used adsorbent powdery material, such as activated carbon powder, from a water purification or potabilization installation, wherein said method includes: a first step of desorbing the main part of the organic matter adsorbed on the used adsorbent powdery material consisting of placing said aqueous phase containing the used adsorbent powdery material in contact with a desorbent compound resulting in a first aqueous phase containing at least partially regenerated adsorbent powdery material and desorbed organic matter; a first step of separating by sedimentation the main part of the desorbed organic matter from the rest of the first aqueous phase containing the at least partially regenerated adsorbent powdery material leading to the production of a second aqueous phase containing the at least partially regenerated adsorbent powdery material; a first step of neutralizing said second aqueous phase containing the at least partially regenerated adsorbent powdery material; a second step of separating the at least partially regenerated adsorbent powdery material from said second aqueous phase leading to the production of a third aqueous phase containing the at least partially regenerated adsorbent powdery material.

Method and installation for treating an aqueous phase containing an adsorbent used material

A method for treating water in a ballasted flocculation system comprises directing water into a ballasted flocculation zone and adding ballast and a flocculation reagent to the water to form a water-floc mixture. The water-floc mixture is directed into a settling zone to form treated water and sludge containing ballast. The ballast is then directed to a recirculation line where the ballast is recirculated to the ballasted flocculation zone. The method further includes determining the ballast concentration and comparing the ballast concentration with a predetermined threshold value. The rate at which ballast is recirculated to the ballasted flocculation zone is adjusted based on the determined ballast concentration and the predetermined threshold value. A ballasted flocculation system for treating water comprises a ballasted flocculation zone, a water inlet for directing water into the ballasted flocculation zone, and a flocculation reagent inlet for directing flocculation reagent into the ballasted flocculation zone. The system includes a settling zone for separating treated water from sludge containing ballast and a recirculation line for recirculating ballast from the settling zone to the ballasted flocculation zone. A first ballast inlet is operatively connected to the recirculation line for directing ballast into the ballasted flocculation zone. Finally, the system includes a sensor for measuring a parameter of ballast in the system.

Method of treating water by ballasted flocculation/settling, which includes a continuous measurement of the ballast, and corresponding installation

A method for treating water includes directing untreated water into a mixing zone in a water treatment system and mixing the untreated water with a flocculating agent and a ballast to form a ballast-floc mixture. Thereafter, the ballast-floc mixture is directed to a settling zone where the mixture settles to form sludge. Treated water is discharged from the settling zone and the sludge is directed to a separator. The method further includes separating at least a portion of the ballast from the sludge and directing the separated ballast from the separator to the mixing zone. Finally, the sludge is directed from the separator to a sludge treatment reactor where at least some of the remaining ballast settles from the sludge and substantially ballast-free sludge is discharged from the sludge treatment reactor.

Method for water treatment by flocculation/settling using ballasted floc degritting of the sludge

A method for removing helminth egg and other suspended solids from a wastewater stream includes directing the wastewater to a ballasted flocculation system and adding a coagulation agent, flocculation agent and a ballast into the wastewater. Sludge is settled from the wastewater in a settling tank at a rate of at least 10 meters per hour. The method further includes removing helminth egg by filtering the effluent through a fine screen having a mesh diameter of approximately 5 micrometers to approximately 25 micrometers. After passing through the fine screen, the filtered effluent has less than one helminth egg per liter.

Wastewater treatment method comprising decantation and fine screening stages

The invention relates to a method for removing impurities from an aqueous stream. The method includes directing the aqueous stream into an adsorbent contact zone and contacting the aqueous stream with an adsorbent material in the adsorbent contact zone so that impurities in the aqueous stream are adsorbed onto the adsorbent material. The aqueous stream and the adsorbent material is then directed to a ballasted flocculation zone where the adsorbent material is mixed with ballast to form sludge. The aqueous stream is then separated from the sludge to produce treated water and the sludge is settled in a settling zone. The ballast is then separated from the sludge and directed to the ballasted flocculation zone while the sludge and the adsorbent material are directed to a transition zone. In addition, the method requires measuring the concentration of the adsorbent material in the adsorbent contact zone and adding adsorbent material to the aqueous stream if the value of the measured concentration of the adsorbent material in the absorbent contact zone is below a predetermined threshold value.

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Saint-Etienne-en-Cogles, France

Philippe Sauvignet