Abstract: The invention relates to a device for filtering a liquid, in particular water, comprising membrane filtering modules, connected by pipes to valves for controlling the flows of liquid travelling towards the modules and coming from same, including a first block made up of an assembly (14a) of membrane filtering modules, a second block made up of a system of valves (14b), and a third block made up of a group of intermediate pipes (14c) comprising an interface between the system of valves (14b) and the assembly of modules (14), only the interface (14c) requiring to be changed when changing the type of filtering modules, while the system of valves (14b) and the assembly of modules (14a) remain unchanged, except when changing the type of modules.

Abstract: The invention relates to a method for drying slurry-like materials, in particular sludge from wastewater treatment plants, including two drying stages, namely: a first indirect drying stage (2), supplied with hot fluid, which receives sludge having an entry dryness Se, and outputs sludge having an intermediate dryness Si and water steam, which is channelled towards a condenser (8) in which a heating fluid, in particular water, is reheated and, in turn, heats a heating gas for a second drying stage (6); and a step (5) of forming strings of sludge at the exit from the first stage; the second stage (6) of drying the strings of sludge using gas at least partially heated by the heat extracted from the condenser, said second stage outputting a slurry having a final dryness Sf; the intermediate dryness Si is controlled according to the measured entry dryness Se and the desired exit dryness Sf, for minimum consumption of the total energy used for drying, the flow rate, pressure and/or temperature of the hot fluid (3)

Abstract: A method for the treatment of effluents containing nitrogen in the form of ammonium, in which: a volume of effluent is introduced into the batch reactor in successive volume fractions, each volume fraction being treated during a subcycle, each subcycle including a phase of feeding with a volume fraction and, in an alternating manner, two treatment stages, i.e. an aerated first stage, during which complete or partial oxidation of the ammonium takes place to give nitrites, followed by a nonaerated second stage, during which the nitrites produced and the ammonium are converted to nitrogen gas. During the aerated first stage, the dissolved oxygen concentration in the batch reactor is maintained between 0.1 mgO2/l and 0.6 mgO2/l; the N—NO2:N—NH4 ratio is adjusted to be between 0.9 and 1.5 at the beginning of the nonaerated stage; and the nonaerated phase is carried out by deammonification, without the provision of carbon-based substrate.

Abstract: Method for bringing ozone into contact with a flow of liquid in which a fraction of the liquid flow is tapped off, a carrier gas laden with ozone is injected into the tapped-off flow, forming gas bubbles, the gas bubbles and the liquid are mixed so as to form a two-phase tapped-off flow, and the tapped-off flow is reintroduced into a descending vertical stream of the main liquid flow, this vertical stream undergoing, at the bottom, a change of direction to essentially the horizontal, the reintroduction of the tapped-off flow being carried out at the lower end of an injection tube immersed in the descending vertical stream of the main flow.

Abstract: A method controls mass and heat loading of sludge feed into a fluidized bed combustor (FBC) controlled via regulation of a polymer dosage or a sludge feed rate including: continuously monitoring at least one performance characteristic of the FBC; producing an input signal characteristic; analyzing the input signal and determining a first rate of change of the characteristic; generating an output signal based on the first rate of change to control addition of polymer to the FBC; generating a second output signal to control addition of sludge feed to the FBC; and determining a transition point between the addition of polymer and addition of sludge, which transition point is an upper limit of a first rate change to maintain flow so that the value of the characteristic is maintained proximate at the upper limit.

Abstract: The invention relates to a pulsed sludge bed settling method for treating all types of liquid, in particular water, and which uses at least one powder or grain reactant, according to which: the liquid and the reactant(s) for the treatment are contained in a tank (1) comprising, at the base thereof, a means (2) for uniformly feeding liquid to be treated over the entire surface thereof; the treated liquid is discharged into the top portion of the tank, at the top level (S) of the liquid; the liquid to be treated is supplied into the tank by pulsations, inducing alternating vertical movements of the sludge bed (M); and part of the sludge is spilled into a concentrator (12) when the top level of the sludge bed exceeds a spilling level (Ld).

Abstract: The invention relates to a method for controlling oxygen supply in a tank (2) for biologically treating wastewater by alternating aeration including consecutive cycles, wherein each cycle comprises a first aeration phase and a second anoxic phase for reducing nitrites and nitrates formed during the preceding aeration phase, the tank is provided with sensors for measuring ammonia nitrogen (4b) and for measuring nitrate (4c) and optionally for measuring oxygen (4a) that is dissolved in the tank liquor or in the liquor thereof exiting the tank, a method according to which the oxygen supply is controlled in the aeration phase when the reduction speed of the nitrate measurement is less than a bottom threshold and the cutoff of the oxygen supply is also controlled in the aeration phase when at least one of the following triggering events occurs: the reduction speed in the measurement of ammonia nitrogen becomes lower than a bottom threshold; the total sum of ammonia nitrogen and nitrate measurements becomes higher

Abstract: The invention aims at enabling, in a catalytic decarbonation apparatus, inert particles coated with calcium carbonate to be constantly and systematically extracted from the reactor, with no risk of clogging the discharge pipes. Therefor, said pipes (7?a, 7?b) have an inside diameter ranging between 40 and 60 mm and they have a downward incline up to their connection to an outside discharge conduit (8?), except, possibly, a horizontal portion starting from the orifice through which they emerge into the reactor (1?).

Abstract: The invention relates to a method for managing the plugging of membrane modules and of filtration membranes, in particular for nanofiltration, ultrafiltration or reverse osmosis for desalinating water, which comprises carrying out consecutive rinsing operations for controlling clogging, in particular biological clogging: evaluating the thickness of the biofilm; starting a rinsing operation at the latest when the evaluated thickness of the biofilm exceeds a first predetermined setpoint value for the biofilm thickness and stopping the rinsing operation not before the biofilm thickness has become lower than a second predetermined setpoint value lower than the first one for the biofilm thickness.

Abstract: The invention relates to a static decanter (D) for prethickening liquid sludge in a water treatment plant, in particular wastewater, comprising an inclined bottom (8), the decanter being provided with a liquid sludge supply pump (13), a device for injecting a polymer in the liquid sludge, an overspill discharge (23) and a pump (26) for extracting the prethickened sludge from the decanter. The decanter further includes a means for accelerating the sludge decantation, a means (M) for adjusting the concentration of suspended material in the prethickened sludge at the outlet, and capable of maintaining the concentration of the prethickened sludge extracted from the decanter at a substantially constant level despite the concentration variations at the inlet, and a means (M3) for adjusting the level of the sludge blanket (V) and capable of maintaining said level at the lowest possible level.

Abstract: The invention concerns a water treatment method including a step of clarification, followed by an ozonization step and at least one filtration step, wherein after the clarification step (1), one fraction of the main stream of water is diverted (9); said diverted fraction of water is circulated counter-current (7) to an ozone-rich carrier gas, and the ozone-enriched fraction of water is diluted in the main stream.

Abstract: Method for disinfecting a filtration works (F) for the pretreatment of salt water, particularly seawater, upstream of a water desalination unit (1) using a reverse osmosis membrane, whereby an operation of disinfecting the filtration works is carried out periodically by adding a bactericidal agent to the water that is to be pretreated, the filtration works being periodically subjected to a declogging operation; the operation of disinfecting the filtration works (F) is carried out during a declogging operation, and the liquid used for the declogging is formed of an aqueous declogging solution the salt content of which differs from the content of the water being pretreated; the bactericidal agent is added (14) to the declogging solution upstream of its injection into the filtration works (F).

Abstract: Systems and methods of treating flue gas and wastewater generated by treating the flue gas are disclosed and include introducing the flue gas, a flue gas treatment fluid that removes sulfur dioxide from the flue gas; and an organic acid conditioning agent into a wet-oxidation scrubber/absorber; introducing FGD scrubber wastewater generated by the wet-oxidation scrubber/absorber into an anoxic biological reactor to substantially denitrify the FGD scrubber wastewater; and introducing resulting substantially denitrified FGD scrubber wastewater into an anaerobic biological reactor to substantially reduce the amount of sulfate and/or selected heavy metals in the FGD scrubber wastewater.

Abstract: The invention relates to a biological wastewater purification method using a reactor including a first compartment (2) and a second compartment (4), the lower parts of which are communicated with one another. The water to be treated enters the first compartment, while the second compartment houses aerobic granular sludge at atmospheric pressure. Oxygen-laden gas is injected into the lower part of the second compartment. The granular sludge forms a bed (5) in the second compartment (4) and the reactor operates in a sequential, discontinuous manner in a cycle comprising two phases, namely: a first anaerobic phase during which the first compartment (2) is vacuum-filled with the water to be treated, after which the pressure is abruptly brought to atmospheric pressure in order to discharge a volume of water rapidly into the second compartment (4); and a second aerobic phase during which gas containing oxygen is injected into the second compartment (4).

Abstract: A process removes boron from ion exchange system regeneration solution including introducing a borate precipitator into the regeneration solution in a precipitation zone to generate borate precipitate; introducing a coagulator into the regeneration solution that coagulates solids and/or borate precipitate generated by the borate precipitator and absorbs boron into the solids; introducing the regeneration solution, solids and borate precipitate into a separation zone; introducing anionic polymer into the regeneration solution adjacent to or in the separation zone to increase the propensity of borate precipitate and solids to separate from the regeneration solution; and filtering the regeneration solution to remove residual suspended solids from the regeneration solution.

Abstract: Installation for the treatment of municipal and/or industrial wastewaters comprising a basin that receives the water to be treated and a series of discs (4) having a packing (G) that are parallel and vertical, mounted on a horizontal shaft (5), partially submerged in the water to be treated, and rotated so that the biomass which grows on the surface of the packing of the discs is alternately brought into contact with the water to be treated and oxygen from the air. The configuration of the packing (G) of the discs (4) is chosen so that the developed surface area of the packing in one zone of the disc increases with the distance from this zone to the axis of rotation (X-X).

Abstract: The invention concerns a method for purifying wastewater loaded with organic matter, said method including: a step of contacting wastewater with a biological culture containing a purifying biomass and a step of separating performed by filtration through organic or inorganic membranes. The invention is characterized in that at least part of the biological culture is subjected to an oxidative stress step enabling a liquor to be obtained by the action of at least one oxidizing agent used in small amount so as to preserve the biological activity of the purifying biomass while modifying the microbial floc to make it denser.

Abstract: Method for the treatment of effluents containing nitrogen in the form of ammonium, according to which: a volume of effluent to be treated in a complete cycle is introduced into the batch reactor in successive volume fractions, each volume fraction being treated during a subcycle: each subcycle comprises a phase of feeding with a volume fraction and, in an alternating manner, two treatment stages, i.e. an aerated first stage, during which complete or partial oxidation of the ammonium so as to give nitrites takes place, followed by a nonaerated second stage, during which the nitrites produced and the ammonium are converted to nitrogen gas. During the aerated first stage, the dissolved oxygen concentration in the batch reactor is maintained between 0.1 mgO2/l and 0.6 mgO2/l; the N—NO2: N—NH4 ratio is adjusted so as to be between 0.9 and 1.5 at the beginning of the nonaerated stage; and the nonaerated phase is carried out by deammonification, without the provision of carbon-based substrate.

Abstract: Sequential biological reactor (R), comprising: a tank (1) delimited by a base and peripheral walls (3); an inlet (11) equipped with a selector (S) that determines a baffled route with contacting of the effluent to be treated and a portion (5) of the recirculated sludges; a means (6) for discharging the treated water in the top part of the water surface of the tank, and an outlet (7) for discharging the excess sludges in the bottom of the tank. The selector (S) comprises a vessel (8) placed in the tank (1) at a distance from the peripheral walls (3); the vessel is compartmentalized into several sectors (8.1, 8.2, 8.3, 8.

Abstract: A method controls mass and heat loading of sludge feed into a fluidized bed combustor (FBC) controlled via regulation of a polymer dosage or a sludge feed rate including: continuously monitoring at least one performance characteristic of the FBC; producing an input signal characteristic; analyzing the input signal and determining a first rate of change of the characteristic; generating an output signal based on the first rate of change to control addition of polymer to the FBC; generating a second output signal to control addition of sludge feed to the FBC; and determining a transition point between the addition of polymer and addition of sludge, which transition point is an upper limit of a first rate change to maintain flow so that the value of the characteristic is maintained proximate at the upper limit.