Abstract: The present invention relates in general to a method for bacterially treating small-tank toilet systems and an apparatus for using same, and in particular, bacterially treating small-tank portable toilets, such as toilet systems in airplanes, busses, campers, trains, boats, and free-standing portable toilets.

Abstract: A method of treating of municipal sludge, paper-pulp sludge, animal and plant waste, and the like, whereby the treatment thereof via electroporation causes the breakdown of waste activated sludge, which is then recycled back to a bioreactor, or to one or more additional bioreactors such as aerobic, facultative, anoxic, or strictly anaerobic.

Abstract: An aerated grit chamber includes an aeration zone in which influent is vigorously aerated and a settling zone separated from the aeration zone by a baffle beneath which wastewater flows from the aeration zone into the settling zone. The aeration causes swirling motion and causes larger grit particles to settle and accumulate in a grit trough on the floor. An inclined plate settler in the upper part of the settling zone causes smaller grit to settle and fall into the grit trough. In order to prevent overly efficient operation at low flow rates and settling of organics with the grit, internal recycling of the wastewater from the settling zone back into the aeration zone is effected, preferably with air lift to induce recycling but also using alternative techniques such as direct pumping.

Abstract: Wastewater treatment systems which utilize an interacting surge anoxic mix zone for facilitating nitrogen removal and an aerobic sequential batch reaction, clarification and decantation zone for facilitating aeration for BOD removal and nitrate production for the surge anoxic mix zone. Sludge reduction may also be accomplished by anaerobic recycle.

Abstract: Waste-treatment processes are enhanced through generation and introduction of specific biological populations customized to perform or favor specific tasks either during the main process, or for solids minimization purposes in a post-treatment process. These bacteria may be grown from specialized mixes of activated sludge and waste influent by exposing these materials to controlled environments (e.g., in an off-line treatment area). They may then be added back to the main process to perform certain tasks such as converting particulate cBOD into soluble cBOD for utilization, to reduce high solids yield organisms by supplementing the population with low yield organisms, to improve nitrification/denitrification efficiency, or to disfavor filamentous biology such as Norcardia sp.

Abstract: A method of removing hydrogen sulphide from a gas stream wherein the hydrogen sulphide is scrubbed from the gas phase by an aqueous solution, the hydrogen sulphide in the aqueous solution is biologically oxidized in a bioreactor to produce elemental sulphur, and the elemental sulphur is separated from the aqueous solution, characterized in that the gas stream to be treated is cooled to such a degree that at least sufficient water vapour condenses from the gas stream to compensate for the discharge stream for the purpose of removing salts. This means that no water need be supplied to the bioreactor. This method is suitable, in particular, for gas streams which contain hydrogen sulphide, the hydrogen sulphide having been obtained by catalytic conversion of sulphur compounds.

Abstract: The invention concerns a method and installation for the treatment of excess sludge derived from biological wastewater treatment plants. The method is characterized in that it consists of associating at least one digestion step (4) and at least one wet oxidation step (2) of said sludge, said wet oxidation step being conducted at a temperature of between 50° C. and 180° C. and at a pressure of between 2 and 40 bar.

Abstract: A wastewater treatment system for use with a conventional septic tank, or other small-scale wastewater treatment facility, for enhancing wastewater treatment without requiring complex control or maintenance limitations. The system incorporates a plurality of primary functions that combine to oxidize, nitrify, denitrify and remove water borne total dissolved solids prior to effluent discharge. Included is a fluidized-bed reactor containing biofilm attached to carrier particulates for use in the purification of wastewater. The fluidized-bed reactor is configured to include two distinct regions, namely a “lower” aerobic region and an “upper” anoxic region, during normal operating conditions. The lower aerobic region uses aerobic facultative bacteria to oxidize Carbonaceous Biochemical Oxygen Demand (CBOD), organic (Kjeldahl) nitrogen, and ammonia while consuming the dissolved oxygen in the water.

Abstract: A wastewater treatment process that provides improved reduction of total solids through endogenous respiration while reducing biochemical oxygen demand and utilizing biological nutrient reduction. The wastewater treatment process uses an efficient aeration delivery system to drastically reduce the time needed to oxidize organic matter, and re-circulates, shreds and homogenizes the organic matter and microorganisms and oxygenates the entire mass many more times than traditional systems resulting in a greater biological solids digestion rate.

Abstract: A system that allows the flexibility of primary and secondary treatment of municipal sludge, paper-pulp sludge, animal and plant waste, whereby the treatment thereof via electroporation may be used either as the primary dewatering treatment, secondary dewatering treatment, direct WAS-treatment, and combinations with other conventional dewatering techniques, in order to provide the municipal treatment plant, or the paper-pulp treatment plant, with the most cost-effective and efficient system as possible. The electroporated-treated sludge releases hitherto unreleased biosolids exiting from the PEF-electroporation system, which are returned to aeration tanks. The electroporation process causes the release of intracellular dissolved/organic matter, which is used as “food” for the bacteria of the aeration tanks.

Abstract: High quality hydrophilic sulfur is recovered from a biologial conversion zone in which a sulfur containing compound such as a sulfide is converted to elemental sulfur. The sulfur is rendered hydrophilic due to the fine particle size and attachment of biomass to the particles. The sulfur is recovered as an undamaged agglomerate powder after being processed in at least two stages of purification.

Abstract: The present invention is directed to a pulsed electric-field system for rupturing and destroying molecular cellular units of waste-activated sludge to thereby liberate intracellular water molecules from the solids-content thereof. The waste-activated sludge is contained in waste sludge, such as paper-pulp sludge, municipal waste sludge, animal or plant waste sludge. The pulsed-electric field is generated by an electroporating device producing a non-arcing pulsed electric field. The released intracellular dissolved/organic matter may be recycled back to an aeration tank for supplying food to bacteria of the aeration tank for performing aerobic digestion thereon, whereby the intracellular, dissolved organic matter is used as food for the bacteria of the aeration tank, whereby the aerobic digestion process is accelerated.

Abstract: A waste treatment apparatus (10) including one or more vertically oriented curtains (11) each formed of mesh material having a minimal aperture size of 0.001 mm, means for applying liquid waste to said curtain(s) located above said curtain (17, 15) and collection means (20A) for collection of treated waste after passage through said one or more curtains (12). There is also provided a method of treatment of waste using the waste treatment apparatus.

Abstract: Wastewater treatment systems which utilize an interacting surge anoxic mix zone for facilitating nitrogen removal and an aerobic sequential batch reaction, clarification and decantation zone for facilitating aeration for BOD removal and nitrate production for the surge anoxic mix zone. Sludge reduction may also be accomplished by anaerobic recycle.

Abstract: The present invention is drawn to a unique apparatus and method for treating and reusing the wastewater discharged from agricultural animal farms. The apparatus and method of the present invention may be readily-sized and configured depending upon the amount and constituent(s) of the wastewater to be treated. In a first embodiment, the apparatus and method of the present invention is designed to be a zero discharge system in which no wastewater will be discharged or land applied. In use, the apparatus and method of the first embodiment may actually require addition of make-up water during periods of low rainfall to make up water losses due to evaporation and drift. It is contemplated that the only byproduct of the apparatus and method of the first embodiment may be a beneficial sludge if a sufficient number of installations are operated.

Abstract: A system that allows the flexibility of primary and secondary treatment of municipal sludge, paper-pulp sludge, animal and plant waste, whereby the treatment thereof via electroporation may be used either as the primary dewatering treatment, secondary dewatering treatment, direct WAS-treatment, and combinations with other conventional dewatering techniques, in order to provide the municipal treatment plant, or the paper-pulp treatment plant, with the most cost-effective and efficient system as possible. The electroporated-treated sludge releases hitherto unreleased biosolids exiting from the PEF-electroporation system, which are returned to aeration tanks. The electroporation process causes the release of intracellular dissolved/organic matter, which is used as “food” for the bacteria of the aeration tanks.

Abstract: The invention relates to a method for decoloring liquids, in particular ground water, by means of a membrane filtration unit, wherein the following steps are carried out: i) subjecting the ground water to a biological treatment in a bioreactor; ii) feeding the effluent from the bioreactor of step i) to the membrane filtration unit, in which membrane filtration unit a separation between biomass and decolored ground water takes place; followed by iii) feeding back the biomass from step ii) to the bioreactor. The invention also relates to decolored ground water and to a device for decoloring liquids.

Abstract: The present invention relates to a precess and apparatus for biological treatment of liquid and solid waste. The liquid waste is treated by an upflow aerobic biofilter and the solid waste is treated with powdered zeolite.

Abstract: A method and apparatus are disclosed for treating an organic waste water which are capable of utilizing compact equipment by reducing the quantity of a sludge to be treated. Organic waste water (A) is subjected to an aerobic biological treatment in a biological treatment tank (3). Then, solution (B) obtained by the treatment in the biological treatment tank (3) is solid-liquid separated into treated water (C) and sludge (D) in precipitation tank (5). A portion of the sludge (D) separated in the precipitation tank (5) is returned to the biological treatment tank (3) through a route (6). A portion (E) of the sludge separated in the precipitation tank (5) is concentrated by a concentration device (8). Thereafter, the concentrated sludge (E) is solubilized by thermophilic bacteria in a solubilizing tank (10).

Abstract: Method for dewatering of water-containing sludge in a sewage well or the like, wherein the water-containing sludge is collected in a tank, the sludge is separated in a downstream filter and the purified water is returned to the well, wherein at least one adjustable and inflow controlling valve is coupled between a suction tank and a downstream filter, a feeding device is arranged for continuous or intermittent discharge of the sludge separated in the filter to one or more compressing units, intended for compressing of the fed sludge, further comprising a container for storing the compressed sludge and tanks units and pumps for receiving and transporting the squeezed out and purified, respectively, and in the process oxygenated water.

Abstract: A wastewater treatment system comprises a septic tank which flows substantially all of its liquid effluent through an aerobic filter having a filter medium to produce a nitrified filtrate of reduced biological oxygen demand (BOD) and total suspended solids (TSS). The majority of the filtrate is returned to the septic tank for denitrification followed by further recirculation through the aerobic filter. All permanent discharge of effluent from the system is in the form of filtrate from an aerobic filter. Permanent discharge of effluent directly from the septic tank is prevented.

Abstract: A method for the treatment of process water or effluent from a papermaking process, in which this water is subjected to at least one anaerobic purification step, an aeration step and a solids separation step and the water is then returned to the production process, and at least two treated water streams of different quality, which originate from a different combination of purification steps, are returned to different points in the production process.

Abstract: A bifurcated fan (1) which draws in atmospheric air through air/liquid contact blocks of plastic grids which are sprayed with the liquid to be treated. The blocks change position in order to be sprayed on both front surfaces alternatively and thus remain clean. The liquid evaporates in the contact blocks and the concentrate is dehydrated in a secondary laminar evaporation base. The arrangement into converging sectors provides a geometry with minimal aerodynamic losses in a liquid with organic matter. The device includes a central tank which facilitates an aerobic biopurification process aided by the oxygenation in the contact blocks. Thermal exchanges may be included at the air inlet, using residual energy, particularly from thermal engines to which it provides refrigeration and cleaning of exhaust gases.

Abstract: There is described a method of processing waste water, in particular from malt factories and breweries, which in the operational use is contaminated with microorganisms, salts and organic compounds. To enable a reuse, it is proposed to subject the waste water to a reverse osmosis after a treatment with activated sludge, before it is recirculated to the operational use.

Abstract: A process for washing fat- or dye-soiled materials involving: (a) providing a fat- or dye-soiled material; (b) providing an aqueous detergent-containing liquor; (c) contacting the fat- or dye-soiled material with the aqueous detergent-containing liquor, thus forming a washed material and wash wastewater; (d) providing a source of rinse water; (e) rinsing the washed material with the rinse water, at least once, thus forming rinsed material and rinse wastewater; (f) collecting both the wash and rinse wastewater; (g) chemically pretreating the collected wash and rinse wastewater by contacting it with a compound selected from the group consisting of a demulsifier, an oxidizing agent and mixtures thereof to form waste particles; (h) mechanically removing the waste particles from the collected wash and rinse wastewater by flotation or sedimentation to form prepurified wash and rinse wastewaters; (i) biologically treating the prepurified wash and rinse wastewater by introducing it into a fixed-bed reactor containing

Abstract: During a waste water treatment process such as an activated-sludge process using microorganisms, the present invention ozonizes a microorganism-mixed liquid. It reduces the amount of microorganisms remaining, prevents a microorganism floc from sedimenting inappropriately, and recovers appropriate sedimentation while maintaining treatment performance. A waste water ozonization apparatus according to an embodiment of the present invention can include a sludge drawing pump which draws a microorganism-mixed liquid from an aeration vessel; an ozonizer for generating ozone gas which reacts with the microorganism-mixed liquid; an ozonization vessel which injects the ozone gas generated by the ozonizer into the drawn microorganism-mixed liquid; an ozonized-sludge channel that returns the ozonized microorganism-mixed liquid to the aeration vessel; and a control section for intermittently performing an ozonization operation.

Abstract: In a method and apparatus for the purification and/or treatment of communal and/or industrial wastewaters, particularly for use in marine installations, a biologically operated reaction apparatus is provided in which the wastewater to be purified and/or treated is received. In the reaction apparatus, a bio-mass of high concentration is suspended. To this reaction apparatus, the wastewater to be purified and/or treated is supplied. Subsequently, the pre-purified or, respectively, pre-treated wastewater is supplied to a membrane separation apparatus in which it is separated into a permeate and a retentate. The retentate is at least partially returned to the reaction apparatus, whereas the permeate is either discharged as useable or pure water or is returned to the reaction apparatus.

Abstract: A river is divided into a plurality of river sections via a plurality of partitions which are spaced apart along the direction of the flow of the river. Polluted water at or near the surface of the river from the river sections is pumped to water treating apparatuses without drawing the polluted water near the floor of the river. Suspension pollutants, including nitrogenous nutrients, are removed from the polluted water via filtration in the water treating apparatuses. After treatment, the treated water is sent to the river in such a manner that the water drawn from each river section is sent to another one of the river sections, that is located immediately downstream, at the same rate as the river flow and that the remaining portion of the treated water is sent back to the upstream river section from where the water comes.

Abstract: The invention is a biological process for purifying waste water in order to produce an effluent with a low content of carbon and of oxygenated nitrogen compounds. The process includes an initial step of mixing the waste water in a biological reactor with activated sludge to denitrify the resulting mixture. Then, air is introduced into the mixture to form an anoxic sludge thereby directly oxidizing carbon present in the anoxic sludge and removing carbon therefrom, simultaneous with the denitrification. The anoxic sludge is clarified to separate it from a denitrified intermediate effluent. The clarified anoxic sludge is recycled to the biological reactor.

Abstract: A bioprocessing system for a feed such as wastewater comprises an anaerobic reactor subsystem, an aerobic reactor subsystem, and a recycle loop for partial recycling of the aerobic reactor subsystem effluent. The anaerobic reactor subsystem is capable of providing anaerobic processing of the wastewater in the substantial absence of aerobic processing of the wastewater. The anaerobic reactor subsystem can include a single anaerobic reactor or a plurality of reactors. The aerobic reactor subsystem is in direct communication with the anaerobic reactor subsystem, with the aerobic reactor subsystem being capable of providing aerobic processing of the wastewater in the substantial absence of anaerobic processing of the wastewater. The aerobic reactor subsystem processes the wastewater from the anaerobic reactor subsystem without intervening bioprocessing of the wastewater. As with the anaerobic subsystem, the aerobic reactor subsystem can include a single aerobic bioreactor or a plurality of reactors.

Abstract: A waste water treatment method and apparatus uses microorganism-containing sludge to treat waste water containing fluorine and does not utilize any chemical reaction. For waste water treatment, a treatment tank has an anaerobic part having sludge containing microorganisms and an aerobic part having sludge containing microorganisms and communicating with the anaerobic part. Waste water to be treated and biological excess sludge are introduced into the anaerobic part. Once treated by the microorganisms, the water is filtered by a membranous separation device in the aerobic part, and output as treated water. In the treatment tank, the microorganisms are moved between the anaerobic part and aerobic part to enhance their ability to concentrate or accumulate therein fluorine or other substances contained in the waste water.

Abstract: A method for treating sludge from wastewater purification is described. In the method, a sludge is treated, which contains phosphorus and at least one metal which originates from precipitation chemicals and which is selected among divalent iron and aluminum, the pH of the sludge being adjusted to below 4, preferably below 2, for dissolving the content of the phosphorus and said metal in the sludge; the remaining sludge is separated; the solution relieved of sludge and containing phosphorus and said metal is treated for precipitation of the phosphorus content of the solution as FePO4 at a pH of 2-3; and precipitated FePO4 is separated. The method is characterized in that the solution which remains after separation of FePO4 and which contains said metal from the precipitation chemicals, is recycled to the wastewater purification. The phosphorus content of the solution is precipitated as FePO4 by adding an at least equivalent amount of Fe3−.

Abstract: A method and apparatus for bioprocessing particles wherein particles are entrapped a porous material and have biologically active microorganisms on their surfaces. A liquid (carrying oxygen and/or nutrients for said microorganisms) is passed through the entrapped particles and microorganisms and microorganisms are active to breakdown said particles. After a suitable period of time the particles are removed from the matrix.

Abstract: The invention presents a residual water treatment plant for small flows, characterized by the combination of a primary sedimentation zone followed by anoxic and aerobic packed zones, placed serially all of them, with packing, alternating descending and ascending flows and aerated according to the oxygen requirement, there being a recirculation of treated water with sedimented mud between the secondary sedimentator and the first anoxic compartment or primary sedimentation zone, which produces treated water with enough quality for reutilization activities, after prior disinfecting (for example, watering, automobile-washing, flushing of sanitary facilities, floor-washing, and so forth). The plant requires the use of a low energy consumption air compressor, especially specified to minimize its maintenance and noise. The treatment microplant has a compact design, which requires a small area (of the size of a water cistern for 1100L, 1.

Abstract: A slurry-forming apparatus and method of using the slurry-forming apparatus. In one aspect, the apparatus (122) comprising: a) a vessel, comprising: i) a cylindrical vessel wall (60, 160), the cylindrical vessel wall having an interior surface; ii) a downwardly-sloped floor joined to the vessel wall; an outlet in the downwardly-sloped floor; iii) and one or more baffles (172, 182) along the interior surface of the vessel wall; b) a fluid inlet opening (86) into the vessel and being configured for injecting a fluid into the vessel; c) a granular material inlet opening into the vessel and being configured for providing a granular material into the vessel; and d) the baffles, fluid inlet, granular material inlet and outlet being configured relative to one another whereby a slurry is formed from the injected fluid and provided granular material without substantial mechanical agitation of the vessel, and whereby the slurry exits the vessel through the outlet.

Abstract: The present invention is drawn to a unique apparatus and method for treating and reusing the wastewater discharged from agricultural animal farms. The apparatus and method of the present invention may be readily sized and configured depending upon the amount and constituent(s) of the wastewater to be treated. In a first embodiment, the apparatus and method of the present invention is designed to be a zero discharge system in which no wastewater will be discharged or spray irrigated. In use, the apparatus and method of the first embodiment may actually require addition of make-up water during periods of low rainfall to make-up water losses due to evaporation and drift. It is contemplated that the only byproduct of the apparatus and method of the first embodiment may be a beneficial sludge if a sufficient number of installations are operated.

Abstract: Wastewater treatment systems which utilize an interacting surge anoxic mix zone for facilitating nitrogen removal and an aerobic sequential batch reaction, clarification and decantation zone for facilitating aeration for BOD removal and nitrate production for the surge anoxic mix zone.

Abstract: A process for scrubbing a gas containing hydrogen sulphide and/or carbonyl sulphide, in which the spent scrubbing liquid is treated with autotrophic sulphide-oxidizing bacteria capable of oxidizing at high pH, and elemental sulphur is obtained, the elemental sulphur is separated and the treated scrubbing liquid is recycled to the gas scrubbing step. Before recycling, the scrubbing liquid may further be treated with heterotrophic thiosulphate-oxidizing bacteria which produce polythionate which is useful for further enhancing the sulphide-scrubbing capacity of the scrubbing liquid.

Abstract: An apparatus for wastewater treatment, includes a calorie reducer first vessel having an inlet and an outlet, the outlet adapted to control the retention time of wastewater within the first vessel. A first recycle pump is connected to the first vessel to recycle wastewater from a bottom of the first vessel to a top of the first vessel through a recycle conduit, at a high velocity. The recycle conduit provides an air gap for drawing air into the first vessel. Bacteria within the calorie reducer vessel consume biodegradable food with a minimum number of bacteria while in the log growth phase. A second bio-reducer vessel is connected to the calorie reducer vessel. The bio-reducer holds a media supported above a bottom reservoir. A bio-reducer recycle pump recycles wastewater within the reservoir to be sprayed onto a top of the bio-reducer, to wash over the media. Further bio-reducers can be arranged downstream of the first bio-reducer.

Abstract: A method and apparatus for wastewater treatment is provided which can treat persistent surface active agents and coloring substances in wastewater, and which is compact and economical. The wastewater treatment method introduces water to be treated into a charcoal tank 3 packed with charcoal 10 and treats the water therein, the water to be treated having been pretreated in a pretreatment section 2. The water under treatment is introduced from the charcoal tank 3 into an activated carbon tower 6 packed with activated carbon 17 to treat the water therein. Treatment of the water in two stages, namely, treatment by bioactivated charcoal 10 and treatment by bioactivated carbon 17, makes it unnecessary to carry out backwashing of the activated carbon tower 6 and regeneration of activated carbon 17. The service life of the activated carbon can be greatly extended.

Abstract: A method for fluidization of a particulate bed material in a fluidized bed reactor with an upflow of fliud being treated, wherein a step of recycling said treated fluid is provided and further comprising the steps of (a) uniformly collecting at least a portion of the fluid above the fluidized bed and lifting this fluid by at least one gaslift having an intake above the bed, and (b) recycling the lifted fluid under the bed via at least one downcomer positioned within the bed. An generic apparatus for conducting the method steps in a variety of applications is also provided. The fluidized bed reactor can be used for chemical, physical chemical, biological processes, and combinations thereof in the chemical processing, food, environmental and other industries.

Abstract: The invention relates to a process for the biological treatment of waste water, in which a mixture of activated sludge and waste water is treated with gas in an activation stage and the activated sludge is separated off from the treated waste water by flotation, wherein the concentration of the activated sludge in the activation stage is .gtoreq.6 g/l and wherein the flotation is a pressure-relief flotation.

Abstract: An apparatus and method for treating and reusing the wastewater discharged from agricultural animal farms. The apparatus and method of the present invention is designed to be a zero discharge system in which no wastewater will be discharged or spray irrigated. The wastewater effluent is first passed through a mechanical screen were bulk solids are separated and partially de-watered. The screened effluent is then directed to a primary plastic-lined earthen lagoon where it undergoes aerobic digestion utilizing specially selected bacteria. After treatment in the primary lagoon, the wastewater effluent is used to wash the floors of the hog houses or undergoes a purification phase including solids separation/denitrification, filtration and sterilization. The solids separation/denitrification phase (clarification) preferably takes place in an anoxic environment in preferably above-ground tanks where suspended solids removal will occur as well as denitrification for nitrate reduction.

Abstract: A process for treating effluents loaded with organic material, particularly wine-making effluents essential in the form of wash water, comprises pouring the effluents to be treated into a storage basin (1) and actuating a recirculation circuit (2) between this latter and an oxygenation reactor (3) for the effluents, actuating a superoxygenation device (4) when the volume of effluents stored is too great to avoid passing into anaerobic phase, then stopping the superoxygenation and maintaining the recirculation at a minimum level avoiding the passage into anoxia of the effluents, when these latter fulfill certain minimum pollution conditions. The effluents are poured over at least one purification body (5) and the purified effluents are withdrawn, until there is substantially nothing left but residual decantation sludges more or less mineralized, in the storage basin (1). These latter are treated to delay the organic components present and to lead to a substantially inert mineralized sludge.

Abstract: The disclosed process for treatment of organic wastewater such as manure-washing wastewater discharged from the livestock industry or wastewater discharged from the food industry comprises the step (1) of subjecting the organic wastewater to an aerobic biological treatment, and the step (2) of subjecting the treated water obtained in the step (1) to a biological treatment in a lagoon. The process may further comprise, before the step (1), the step of subjecting a mixture of the organic wastewater and part of the treated water obtained in the step (1), recycled back and combined therewith, to a biological denitrification treatment. The treated water obtained by the process is so improved in quality as to enable safe disposal thereof. A submerged biofilter process (packed-bed reactor process) is preferably used in the aerobic biological treatment since it can remarkably improve the overall stability of the whole wastewater treatment process to obtain a stable quality of treated water.

Abstract: The invention relates to a method for treating waste water from carwashes in a mechanical and a biological treatment step, the waste water after running through a silt chamber (2) being collected in a reservoir (3), then passed via an aerosol filter (7) into a bioreactor (8) where it is collected for reuse after biological clarification in a clean-water tank (11), and to a plant for carrying out in particular this method.

Abstract: A bioremediation process employing an improved bioreactor comprises pumping contaminated ground water from a recovery well in a contamination site, passing the water through a fully pressurized bioreactor wherein the water is enriched with nutrients and oxygen and treated with microorganisms native to the contamination site, and returning the enriched and treated water and microorganisms in a finely dispersed state to the contamination site, thereby enhancing bioremediation in a subsurface bioactive zone. The recirculation is accomplished with only the recovery well pump. The bioreactor is a fully pressurized fluidized bed bioreactor. The bioreactor includes a recirculation loop driven by a fluidization pump. The loop has a first branch that returns a portion of the recirculating water directly to the bioreactor inlet.

Abstract: In a sealed container, organic material, more especially biowaste is composted. The exhaust air from the sealed container is purified in an exhaust air cleaning unit. In order to improve the cleaning effect, the condensate water from the exhaust air cleaning unit is supplied to a high performance bioreactor, in which it is brought into contact with atmospheric oxygen and is agitated. The suspension leaving from the bioreactor is caused to flow in a circuit through an ultra-filtration module for purifying the water.

Abstract: Waste water from a laundry (1) is collected in a storage container (3), fluffs and textile sheddings are separated through filtering sieves (2). The volume of the container is set so that it may store the amount of waste water produced for example during two days. The waste water is supplied with a bio-reactor (4) that works in aerobic conditions. Air is lead into the bio-reactor (4) at its lower end (5), establishing aerobic conditions therein. The biologically considered water leaves the bio-reactor (4) at the top end (6) of the column-shaped bio-reactor (4) and is supplied to an active coal column that acts as an adsorber (7). The adsorptively purified water leaves the adsorber (7) packed with active coal through the duct (8), is collected in a storage container (9) and if required is returned through duct (10) to the laundry, if required after 5 to 20% fresh water are added.

Abstract: The wastewater treatment unit is operable under high intermittent flow rate variations. It comprises a first clarifier in which is carried out a gravitational settling of solids and a second clarifier comprising a network of parallel plates inclined with respect to the vertical and a portion defining a collecting pit. Each plate has an upper edge positioned at a height lower than the filling level of the first clarifier to define an overflow giving access to the collecting pit. The network of plates allows to carry out a further settling of solids to create a counterflow of settled matter toward the first clarifier and a flow of clarified wastewater falling in the collecting pit. A filtering chamber is positioned above the first clarifier and comprises a filtering media supporting a biomass for digesting the organic content of the wastewater coming from the second clarifier.