Abstract: A filter apparatus has a plurality of filter elements (21) accommodated in a filter housing (1) with a filter inlet (11) and a filter outlet (13). During the operation one of the filter elements (21) can be backflushed by a backflushing device. The backflushing device includes a pressure control (7) to support the backflushing. Each filter elements (21) is accommodated in an element housing (30). The element housings (30) with the filter elements (21) performing the filtration process are connected to the fluid outlet (13) by their one open ends (33) in a fluid conducting manner. The element housing (30) of the filter element (21) being backflushed is exclusively connected with its open end (33) to the pressure control device (7).

Abstract: A laundry washing machine (1) includes an outer casing (2) and, inside said outer casing (2), a washing tub (3), a detergent dispensing assembly (9), a fresh-water supply circuit (10) for selectively channeling a flow of fresh water from the water mains towards the detergent dispensing assembly (9) and/or the washing tub (3), and a water softening device (11) interposed between the fresh water supply circuit (10) and the detergent dispensing assembly (9) or the washing tub (3), and being structured for reducing the harness degree of the fresh water supplied to the washing tub (3).

Abstract: A method and device for the cleaning of spiral wound membranes. In the device two or more spiral wound membranes are included in series in pressure tubes. The membranes are cleaned by longitudinal rinsing with water, in which a well-dissolvable gas has been dissolved. In the device for the purification of an aqueous fluid with spiral wound membranes, the membranes can be longitudinal rinsed with water, in which a well-dissolvable gas has been dissolved. As gas that is well-dissolvable preferably CO2 gas or a mixture of gasses is used.

Abstract: A system and method is disclosed for chlorine generation and distribution for the treatment of a pool, spa, body of water, or other water system.

Abstract: In some embodiments, a wastewater treatment system may reduce contaminants in water. A system may include one or more bioreactors which include a substrate that supports a biofilm. The bacteria used to form the biofilm may be selected to maximize the reduction of contaminants in water. Various components of the wastewater treatment system may be optimized to improve the efficiency and energy consumption of the wastewater system.

Abstract: A filter apparatus utilizing pressurized reverse cleaning by a filter drum includes: a housing including an inlet and an outlet through which fluid enters and exits; a filtering means including a top plate and a bottom plate disposed apart at the top and bottom inside the housing and each forming a plurality of through holes in the circumferential direction thereof, wherein a plurality of filter drums formed in a cylindrical shape open at the top and bottom and have both ends coupled to the through holes of the top plate and the bottom plate so as to vertically communicate the plates, and wherein a filter element housed in each filter drum filters the fluid that enters; and a filter cleaning means including a supply pipe, a cylinder pressurizing the fluid and supplying the fluid to the lower portion of the supply pipe, an upper branch installed rotatably at the upper portion of the filter drum and defining a spray conduit therein , and a lower branch installed to rotate together with the upper branch and defi

Abstract: Convenience stores are provided a beverage water processor for coffee and beverages. The “ideal” total dissolved solids (TDS) of perhaps 110 parts per million is achieved without a blendback process. The R/O water is remineralized with a flow through calcite bath. A potassium chloride source is used to inject the exact amount of potassium chloride needed to reach the ideal TDS on the fly before the water reaches the storage reservoir. Alarms trigger a bypass loop to keep the store in business during shutdown. All output water passes through a UV sterilizer.

Abstract: A control unit for a softening device, comprising a primary inlet for untreated water, a primary outlet for blended water, a sensor for determining the water hardness of the untreated water WHraw, or the blended water WHblend, a secondary outlet, a secondary inlet, a bypass line, a blending means which can be automatically adjusted for mixing a blended water flow Vblend(t) from a first partial flow (V(t)part1soft of the secondary inlet and a second partial flow V(t)part2raw of the bypass line, and an electronic control means, wherein the control means is designed to readjust the adjustment position of the blending means by means of the determined water hardness in such a fashion that the water hardness in the blended water flow Vblend(t) is adjusted to a predetermined desired value, enables partial softening of water on the basis of fully automatic blending, thereby utilizing already existing softening devices.

Abstract: A water recycling system that can be used for reclaiming and recycling water, waste water, or grey water, for providing landscape irrigation, or for recycling uses such as for sanitary facilities, as well as for pre-heating clean water to save energy. A water recycling system may include a sealable tank, an influx pipe, a self-clearing filter disposed within the tank, a pump, and an effluent pipe.

Abstract: A gas hydrate slurry dewatering apparatus adapted to feed a raw as into a cylindrical main body of dewatering column so gas to attain pressuriation and so suction any gas from the interior of a drainage chamber disposed around the cylindrical main body so as to attain depressurization. An internal tube (8) as a constituent of a dewatering apparatus (6) in which the gas hydrate slurry (S) is introduced is provided with a separating section (7). A drainage chamber (10) is formed by the internal tube (8) and, disposed with a given spacing therefrom, an external tube (9). An exhaust blower (B2) and a drainage pump (P2) are connected to the drainage chamber (10). A gas feed blower (B3) for a raw gas (G1) is connected to the internal tube (8). A differential pressure detector (x1) is provided for detecting any pressure difference between the interior of the internal tube (8) and the interior of the drainage chamber (10).

Abstract: Monitoring of the performance of a blood fluid removal medium of a blood fluid removal device includes monitoring of condition, such as fluid flow rate or concentration of blood waste product, downstream of the medium. Upstream monitoring of the condition may also be performed to enhance the ability to determine whether the blood fluid removal medium is performing within predetermined ranges.

Abstract: Disclosed herein is an apparatus and method for adding a lubricating additive to a diesel fuel.

Abstract: An electrocoagulation system including a dosing unit, a mixing unit and a buffer tank is provided. The dosing unit receives a fluid from an external source and injects an electrochemically generated coagulant into the fluid using one or more pairs of electrodes. The mixing unit mixes the coagulant with the fluid and is separate from the dosing unit. The buffer tank holds the fluid until particles contained in the fluid grow to a predetermined size.

Abstract: A cleaning method is provided for fluids of a fluid circuit (31) of a mobile device (2) comprising a mobile cleaning module (1), wherein the mobile cleaning module (1) comprises at least one connection element (3, 4, 5, 6) for making a connection to the fluid circuit (31) so that the fluid can be withdrawn from the fluid circuit (31), at least one filter unit (27) for cleaning the fluid, and a connection element (3, 4) for making a connection to the fluid circuit (31) so that the fluid can fed back to the fluid circuit. In a first step, the mobile cleaning module (1) is connected to the fluid circuit by way of the connection element (3, 4, 5, 6). In a next step, the fluid is at least partially withdrawn from the fluid circuit (31) and then the fluid is led through the filter unit (31). Preferably, the fluid can be heated or cooled prior to being introduced to the filter unit (27). In a last step, the cleaned fluid is fed back to the fluid circuit (31) of the mobile device (2).

Abstract: The invention provides a vacuum dehydrating system for gypsum slurry, comprising a vacuum dehydrating apparatus, a first water supply apparatus for supplying filter cake washing water to the vacuum dehydrating apparatus, and a water heating apparatus for heating the filter cake washing water. The invention also provides a vacuum dehydrating method, comprising the following steps: 1) heating the filter cake washing water by the water heating apparatus; 2) supplying the heated filter cake washing water to a vacuum dehydrating apparatus during dehydrating the gypsum slurry by the vacuum dehydrating apparatus. In the invention, the filter cake washing water is heated. Due to the higher temperature of filter cake washing water, the dehydration rate of gypsum slurry is improved so that water content of gypsum filter cake after dehydration is decreased.

Abstract: Advanced control method for a membrane filtration unit, applied to the treatment of an effluent, employing microcoagulation on a membrane, which consists in injecting, upstream of the membrane, a dose of coagulation reactant(s) 30 to 80 times below the dose (X) making the zeta potential of the effluent zero, in which method: quantities defining the quality of the effluent to be treated and quantities defining the state of membrane clogging are measured as input variables; the operating point of the microcoagulation process is located on the basis of the results of the above measurements; thresholds for the input variables are determined, the microcoagulation having to be initiated when said thresholds are violated; and the coagulation reactant(s) is(are) injected depending on the results of the measurements and on the comparison of the input variables with the respective thresholds.

Abstract: A flow through aqueous liquid sterilization apparatus which employs substantially fixed temperatures and pressures and variable flow rates through the apparatus for controllably processing aqueous liquids to achieve predetermined values of SALs.

Abstract: A system and method is disclosed for chlorine generation and distribution for the treatment of a pool, spa, body of water, or other water system.

Abstract: A method and device for the cleaning of spiral wound membranes. In the device two or more spiral wound membranes are included in series in pressure tubes. The membranes are cleaned by longitudinal rinsing with water, in which a well-dissolvable gas has been dissolved. In the device for the purification of an aqueous fluid with spiral wound membranes, the membranes can be longitudinal rinsed with water, in which a well-dissolvable gas has been dissolved. As gas that is well-dissolvable preferably CO2 gas or a mixture of gasses is used.

Abstract: A method and apparatus is disclosed for separating a slurry into liquids and solids in a pressure filter apparatus and for forming a substantially dry and often loosely packet filter solids cake wherein a high temperature and high pressure steam is introduced into an initially formed filter cake in the pressurized filter apparatus to force the steam into the interstices of the formed filter cake and then pressure within the filter apparatus is reduced to permit the steam to flash and to expand within the interstices to absorb any remaining fluids within the formed filter cake and to cause the filter cake to become substantially dry and loosely packed. The filtered solids cake is then discharged from the filter apparatus.

Abstract: A water filter with a sterilizing function has a filtering device, a sterilizing device and a pipe connecting the filtering device and the sterilizing device. The filtering device has a water inlet and a water outlet. The water inlet is connected with a water supplying pipe for receiving water. The sterilizing device has an inlet and an outlet. The outlet is connected with an output pipe for providing water. The inlet is connected to the water outlet of the filtering device. The water flows through the filtering device and the sterilizing device as it goes through the water filter. Therefore, chemical materials and bacteria in the drinking water are removed.

Abstract: A blood processing apparatus in which whether or not circuit components are connected is ascertained, and a method of ascertaining a failure in such circuit connection is provided. By closing a blood return valve, disposed in a blood return passage for returning a blood, processed in a first blood processing unit, to patient's body, blocking a blood circuit including a blood introducing passage, the blood return passage and a delivery passage for delivering unnecessary blood component from the first blood processing unit, driving a first pump in the delivery passage in normal direction, and driving an air pump, fluidly connected with the blood introducing passage and the blood return passage, in reverse direction to discharge air from the circuit to generate negative pressure inside the circuit and the first blood processing unit, connection between the circuit and the first blood processing unit is ascertained.

Abstract: A wearable or portable intermittently operable hydration system includes a purification module that contains one or more solid state UV devices that are positioned in the path of hydrating fluid, or water, flow through the hydration system to a mouthpiece or other orifice. The purification module provides a path for the fluid past one or more solid state UV devices, such as UV LEDs, that produce UV radiation in a germicidal range. When the fluid is flowing past the UV LEDs, the LEDs are turned on to provide sufficient UV radiation to purify the water. The UV LEDs are instant on devices with essentially no ramp-up required, and a sensor or other signaling means in to the flow path controls the turning on of the UV LEDs whenever the user initiates the fluid flow. The fluid flow path may run from a bladder in a backpack worn by the user, a sports bottle worn by or carried by the user or may be through a water filtration system that a user operates via a pump.

Abstract: A device for the controlled distribution of liquids includes a base body with multiple compartments which has multiple inlets and outlets, closed with a cover. The device has a valve in the inside of the body of the base that is made up of two overlapping ceramic disks that have two sets of openings, central openings for controlling the inlet and outlet of the liquid being treated, and other peripheral openings for the control of the reclaiming of the product used for the treatment. The lower disk is joined to the body of the compartmentalised base, and the upper disk is joined to the opening of a turning obturator bell with a central opening and several peripheral slots that correspond to the peripheral openings of the disks. The body of the base forms a transverse peripheral chamber that houses the mechanism for the control of the reclaiming of the product of the treatment.

Abstract: The invention relates to a device for irradiating an absorbing liquid, for example waste water to be disinfected, in a throughflow. Said device comprises at least two radiator units having one cylindrical UV radiation source and three concentric sheaths. A cooling medium for carrying off heat from the UV radiation source flows in a hollow space between the inner and the center sheath. The inventive device allows to use high-performance UV radiation sources and to evenly irradiate the zones of irradiation and prevents floating particles from settling down on the radiator units.

Abstract: A method and apparatus for treating wastewater. The apparatus comprises a reactor having a flow channel generally centrally located in a reactor and immersed in the water or wastewater in the reactor. An agitator is disposed within the flow channel and induces water or wastewater to enter the open upper end thereof and to move downwardly through the flow channel where the water or wastewater is discharged via a flow divider. A reagent is injected into the water or wastewater and the agitator within the flow channel serves to mix the reagent with the water or wastewater passing therethrough and in the process causes at least a slightly turbulent and downward axial flow through the flow channel.

Abstract: A portable system for on-site monitoring and treatment of water comprising a protective enclosure adapted to be positioned proximate a site of collected water, an internal fluid flow system disposed within the enclosure comprising a first conduit extending from a dirty water inlet on the enclosure to a pair of dirty water outlets and a second conduit extending from a return water inlet on the enclosure to a filtered water outlet and a clean water outlet. Probes are provided in the conduits for monitoring fluid parameters therein and communicating those parameters to a controller within the enclosure. The controller compares the measured parameter levels with predetermined acceptable levels and actuates valve members in said conduits in response to the measured parameter levels to selectively communicate the respective conduits with respective outlets for the treatment of water passing through the system.

Abstract: A 10,000 gallon sequencing batch reactor tank for the on-site bio-degradation of oily sludge. Bacteria already present in and adapted to oily sludge degrade the hydrocarbons found in oily sludge within two weeks from 20,000 ppm to less than 100 ppm. A degradation cycle requires 5 days. After five days a recirculation pump and aeration system are turned off and solids are allowed to settle to the bottom of the tank. An ultrafiltration unit connected to the tank requires approximately 16 hours to process the contents of the reactor tank.

Abstract: A system and method for control of a gas and/or chemical for treatment of a fluid, and for monitoring the operation of such a system. In one embodiment, the system comprises a reactor for receipt of the fluid and the gas and/or chemical for dissolving, mixing, diffusing, or infusing the gas and/or chemical into the fluid, and a controller to control the flow of the fluid and the gas and/or chemical into the reactor, and to monitor the operation of the system in accordance with predetermined operating conditions. In another embodiment, the system also comprises a gas/chemical generation system for generation of the gas and/or chemical to be introduced into the reactor. The present invention permits for the control of the system based on numerous dynamic conditions to optimize operation and to minimize safety hazards.

Abstract: The present invention relates to the thickening of pulp suspensions. A low consistency pulp suspension is fed to a pre-thickener (10) through an inlet conduit (18). A layer of thickened pulp, formed on a filter surface (22), is pushed along the filter surface by a cleaning member to the discharge end of the pre-thickener and is discharged through the outlet (20). The cleaning member comprises a rotating shaft (30), on which shaft at least one screw thread (32) is fixed so as to leave a free space between the shaft and the screw thread. Essentially non-thickened pulp is allowed to flow through the apparatus via this space.

Abstract: An apparatus to separate solids from drilling slurry, having an inlet positioned over an outlet of a concentration tank to displace water that would otherwise enter the down-stream centrifuges. Baffles are provided to direct solids to the outlet and minimize the time that solids spend in the concentration tank. Fluids having solids removed therefrom are removed from the apparatus at a location remote from the outlet.

Abstract: A water treatment control system for minimizing trihalomethane formation includes chlorine injection equipment having a plurality of chlorine injectors (11d, 12, 13), a fluorescence analyzer 7 provided on the upstream of the chlorine injectors, and a water flowmeter 6. An chlorine injection rate necessary to reduce a trihalomethane formation potential is calculated by a chlorine injection rate calculating apparatus 14a based on a measured value from the fluorescence analyzer 7. An chlorine injection amount from the chlorine injectors is controlled by chlorine injection amount control apparatuses 15a–15c based on the chlorine injection rate and a measured value from the flowing water flowmeter 6.

Abstract: A pressure-filter apparatus includes at least one filtration chamber coupled with a source of slurry. The filtration chamber is also coupled with a source of fluid at an elevated pressure, which may be arranged in series or in parallel with a source of wash fluid. The pressure-filter apparatus may also include a source of fluid at a conventional pressure. The source of fluid at elevated pressure has a limited volume for initially treating the slurry within the chamber. The source of fluid at conventional pressure has a substantially unlimited volume for completing the treating of slurry within the chamber. The relative volume capacity of the two fluid sources provides an improved efficiency in the treatment of the slurry and the overall efficiency of the apparatus by limiting the time and capacity of accumulation of elevated pressure fluid while using the conventional pressure for extended treatment of the slurry within the chamber.

Abstract: The invention is directed to an apparatus for delivering activated microorganisms to an environment to be treated. The apparatus has a bioreactor containing microorganisms, a supply of organic and inorganic nutrients and a controller. The controller maintains the conditions of the bioreactor so as to maintain the microorganisms in the exponential phase of growth. Although the apparatus is continuous, the controller also doses a portion of the fluid in the bioreactor to the environment to be treated. The invention also provides a method for the biological treatment of wastes and an organic and inorganic nutrient composition used to feed the microorganisms in the bioreactor.

Abstract: The present invention relates to the thickening of pulp suspensions. A low consistency pulp suspension is fed to a pre-thickener (10) through an inlet conduit (18). A layer of thickened pulp, formed on a filter surface (22), is pushed along the filter surface by a cleaning member to the discharge end of the pre-thickener and is discharged through the outlet (20). The cleaning member comprises a rotating shaft (30) on which shaft at least one screw thread (32) is fixed so as to leave a free space between the shaft and the screw thread. Essentially non-thickened pulp is allowed to flow through the apparatus via this space.

Abstract: A method and system for the treatment of wastewater is described herein. The system determines a quantity of fresh water entering a building and supplies a quantity of wastewater treatment solution on a basis of the quantity of entering fresh water. The system includes a conventional septic tank and two sanitization modules connected in series and automatically controlled by a controller. Compressed air and aseptic solution may also be supplied.

Abstract: A continuous method is provided for dissolving a solid oxidizer into an aqueous solution which yields a stream of the aqueous solution having a constant or near constant concentration of solid oxidizer. The method of the present invention includes (a) disposing a bed of solid oxidizer into a container; (b) introducing an aqueous solution below the top surface of the bed; and (c) removing any solution above the top surface of the bed while maintaining a constant or near constant level of aqueous solution above the bed. Preferably, step (c) is performed at about atmospheric pressure. This method can be achieved with a feeder that includes a tank for containing a bed of solid oxidizer and a disperser for introducing the aqueous solution into the tank. A sensor/control unit is provided for sensing a combined bed and aqueous solution volume within the tank and maintaining the combined volume within a predetermined range.

Abstract: A system for controlling the operation and performance of water-only cyclones used in coal preparation plants for separating a fine raw coal slurry into fine coal and fine refuse slurries includes a variable speed pump for feeding the slurry from an underpan of a deslime screen to a water-only cyclone. A nuclear density gauge measures the specific gravity of the slurry feeding the cyclones and generates a signal used to control the addition of water. A level sensor measures the level of the fine raw coal slurry in the underpan. A pressure sensor measures the pressure of the fine raw coal slurry pumped to the water-only cyclone. A speed control device uses signals from the level and pressure sensors to control the speed of the pump in order to maintain an appropriate level of slurry in the underpan, and an appropriate feed pressure to the water-only cyclone.

Abstract: The invention disclosed relates to a method and apparatus for the denitrification of groundwater in situ in an aquifer under substantially anaerobic conditions, the method comprising (a) providing a network, including an extraction well for removal of groundwater from the aquifer and a plurality of injection wells for returning groundwater to the aquifer, the injection wells being arranged in a line substantially perpendicular to the direction of groundwater flow, the extraction well being located downstream or upstream of the line of injection wells, and the spacing of the wells and the number of injection wells being determined by the mathematical relationship J = C p + nC 1 W → min

Abstract: A food disposal system for installation on a drain of a commercial kitchen sink enables segregation of oil/grease from effluent flows from the drain. A housing collects effluent flows containing water, oil/grease, and solids from the drain, and a macerating pump has an inlet connected to an opening of the housing and an outlet connected to a sanitary drain. A greasy water outlet extends to an oil/grease separator from an outlet on the housing above the macerating pump inlet, and a hot water backflush source enables hot water to flow into the housing.

Abstract: A water softener for reducing water hardness, suitable for use in a household washing machine, in particular a dishwasher, has a container within which ionic exchange resins are housed, which reduce the degree of hardness of water contacting them, and apparatus for regenerating the softening efficiency of the resins. Mounted in the container are a sensor for checking a physical characteristic of the resins and, in response thereto, detecting the degree of exhaustion of said resins.

Abstract: A liquid filter apparatus includes a filter media belt enclosed by sealably mated cover pan and floor pan defining a vacuum chamber connected to a sealed clean liquid tank, with clean liquid pumped out continuously to draw liquid to be filtered into an upper region of the filter chamber via on inlet hose connected to a source of liquid to be filtered. The cover pan is lifted after the vacuum is relieved to allow indexing of the filter media belt. A main control valve to the clean liquid tank is closed and pumping liquid continues during indexing. A vacuum control device limits the maximum vacuum developed in the clean liquid tank and a vacuum pump removes air from the tank for priming and to eliminate excess accumulated air.

Abstract: The invention is directed to an apparatus for delivering activated microorganisms to an environment to be treated. The apparatus has a bioreactor containing microorganisms, a supply of organic and inorganic nutrients and a controller. The controller maintains the conditions of the bioreactor so as to maintain the microorganisms in the exponential phase of growth. The controller also doses a portion of the fluid in the bioreactor to the environment to be treated. The invention also provides a method for the biological treatment of wastes and an organic and inorganic composition used to feed the microorganisms in the bioreactor.

Abstract: The invention is directed to an apparatus for delivering activated microorganisms to an environment to be treated. The apparatus has a bioreactor containing microorganisms, a supply of organic and inorganic nutrients and a controller. The controller maintains the conditions of the bioreactor so as to maintain the microorganisms in the exponential phase of growth. The controller also doses a portion of the fluid in the bioreactor to the environment to be treated. The invention also provides a method for the biological treatment of wastes and an organic and inorganic composition used to feed the microorganisms in the bioreactor.

Abstract: A point of entry water treatment system. Components mounted on a base frame are interconnected and provide a system and method for treating freshwater, including from a lake, river, well or cistern, to provide potable water. A pre-filter removes sediment and reduces turbidity, followed by chlorine disinfection of the water. Finally, the water passes through an activated carbon filter to remove remaining free disinfectant and by-products resulting from the application of the disinfectant. Controls are provided that prevent untreated water or raw disinfectant from being output by the system. The controls also dampen the cycling of the system major components to reduce wear and maintenance.

Abstract: A dissolved gas flotation apparatus and process for removing oils and other contaminants from produced water generated in the production of crude petroleum and natural gas. The invention is particularly designed for offshore applications, where space is limited and natural gas is readily available. The invention includes a vessel for receiving and maintaining a liquid level therein and a circulating pump for introducing tiny flotation gas bubbles into the vessel. Natural gas is used as a blanket gas for the vessel and as a source of gas fed into the pump, wherein the gas is mixed with the pumped liquid. The liquid/gas mixture is transferred into the vessel, wherein the gas releases from the liquid, thereby forming tiny, finely dispersed gas bubbles.

Abstract: A reactor system for decontamination of water by photolytic oxidation utilizing near blackbody radiation, the system comprising (1) a reaction chamber defining an internal space with an inlet and an outlet; and (2) a broadband radiator for generating radiant energy with wavelengths between about 150 nm and about 3 &mgr;m, the broadband radiator disposed within the reaction chamber, such that a sufficient dosage of broadband radiation irradiates the contaminants and/or the oxidant within the internal space of the reaction chamber thereby causing photolytic oxidation of the contaminants by direct action of the radiation on the contaminants to break chemical bonds by sustaining a free radical chain reaction of oxidizing components, thus breaking down the contaminants by way of atomic abstraction of the components of the contaminants. In preferred embodiments, at least a portion of the radiant energy is generated in a pulsed mode, such as between about 1 and about 500 pulses per second.

Abstract: A cleaning apparatus for a magnet filter and a method of cleaning a magnetic filter. The magnetic filter is disposed in a circular passage for processing a cleaning fluid. The cleaning apparatus includes sensors for determining when the magnetic filter should be cleaned, which prevents a loss of effectiveness of the cleaning fluid due to detached metal powder falling off of the filter.

Abstract: Systems and methods for heating, reacting, and/or treating a stream containing oxidizable matter. Recycle reactor is used alone or in conjunction with plug-flow reactor. Density differences in the recycle reactor facilitate flow within the recycle reactor without substantial external heat exchange.

Abstract: A domestic water clarifier comprising a storage tank and a batch tank having an annular inner wall is described. Raw water is pressurized and injected into the batch tank along with a quantity of a flocculent chemical such that the raw water and the flocculent chemical swirl around the inner annular wall of the tank, thereby mixing the raw water and the flocculent chemical. The mixture is then allowed to stand, thereby separating into clarified water and floc. The clarified water is drawn off to the storage tank and stored until needed. The batch tank is then flushed to remove the floc and to prepare the batch tank for the next clarification cycle.