Abstract: The present invention relates to an algal purification system. In particular, the present invention relates to a biological purification system incorporating light-converting materials and sun trackers to enhance photosynthesis of algae therein in order to treat wastewater from municipal, agricultural and industrial sources.

Abstract: A dissolved air flotation system and method for purifying fresh water. The system is self-contained within a standard shipping container, with all components disposed in-line within the shipping container. Float is removed from the flotation tank with a skimmer that drives float downstream onto a conveyor belt, and the conveyor belt conveys float away from the flotation tank, in the downstream direction, and deposits the float in a collection tank. Clean water may be drawn from the flotation tank continuously, while float may be removed periodically.

Abstract: An extracorporeal blood treatment apparatus includes a blood treatment unit, a treatment fluid circuit, and a blood circuit. The treatment fluid circuit has a treatment fluid pump for circulating treatment fluid around the treatment fluid circuit and through the blood treatment unit. The blood circuit has a dual chamber blood pump for circulating blood around the blood circuit and through the blood treatment unit. An arterial line withdraws blood from a patient and delivers the withdrawn blood to the blood treatment unit. A venous line returns the treated blood to the patient. The arterial and venous lines can be switched between a first condition in which they are connected to the patient and a second condition in which they are disconnected from the patient and connected to each other for recirculation of blood through the blood circuit.

Abstract: A fluid treatment device including a source of electrical voltage having a first and second terminal, a pulse generator connected to the first terminal and the second terminal and outputting a pulsed voltage wave signal between a third terminal and a fourth terminal, at least one coil positioned adjacent at least one fluid conduit, being electrically connected to the third and fourth terminals and at least one capacitor also being electrically connected to the third and fourth terminals to form a first circuit with an inductance L, a capacitance C and a resonant frequency. The pulse generator is arranged to generate a pulsed voltage wave with a frequency approximately equal to the resonant frequency. A further circuit element is arranged to cause the voltage pulse reaching the coil to repeatedly, alternate between a period of pulsed voltage at the frequency and a period of zero voltage, with each period extending for a time in a range of approximately 2 to 33 milliseconds.

Abstract: A peritoneal dialysis system includes a logic implementer configured to: (i) accept at least one therapy target input; (ii) accept at least one patient transport characteristic input; (iii) accept at least one solution input; (iv) accept at least one fluid volume input; (v) accept at least one therapy time input, at least one of the inputs (ii) to (v) including an input range; and (vi) generate each therapy regimen using the inputs of (ii), (iii), (iv) and (v), including each of the possibilities within the at least one input range, that satisfy the at least one therapy target input.

Abstract: A system and method for powering an ultraviolet (UV) water purification system utilizing a dynamo. A dynamo, operably attached to the UV water purification system, generates power from a rotatable crank which is actuated by a user around an axis of the rotatable crank. When the crank is rotated, the dynamo produces an electrical current that activates and powers the UV lamp, which in turn, produces UV light to purify the water. To ensure that the water has been purified appropriately, a microcontroller, employed within the UV water purification system, tracks both the “on” time and the intensity of the UV lamp as the dynamo is cranked. Once the lamp has been “on” at a sufficient intensity and for an appropriate period of time to administer a required dose of UV light, the microcontroller disables the lamp and provides the user with notification that the process has completed.

Abstract: Disclosed herein is an advanced wastewater treatment device. The device includes a wastewater treatment bath having an anaerobic bath in which phosphorus is discharged, an anoxic bath in which denitrification of nitrate nitrogen is performed, and an aerobic bath in which decomposition and nitrification of organic matter is performed. A first movable divider separates the anaerobic bath from the anoxic bath and is movably provided in the wastewater treatment bath to change relative volume of the anaerobic and anoxic baths. A second movable divider separates the anoxic bath from the aerobic bath and is movably provided in the wastewater treatment bath to change relative volume of the anoxic and aerobic baths. A divider moving unit moves the first and second movable dividers. An air supply unit includes air nozzles, an air pump, and valves. A recycling unit recycles activated sludge of the aerobic bath to the anoxic bath.

Abstract: A method for determining or predicting the adequacy parameters that will be achieved at the end of a kidney substitution treatment during said kidney substitution treatment wherein the kidney substitution treatment is provided by a machine, which has an extracorporeal blood system pumping the patient blood through the blood chamber of a dialyzer, wherein the dialyzing fluid collects the waste products from the patient after flowing through the dialyzing fluid chamber of the dialyzer and wherein a device able to measure a adequacy parameter is coupled with the kidney substitution treatment machine and wherein the slope of a preferable linear guideline for the adequacy parameter is compared to the slope of the delivered adequacy parameter and if the slope of both are equal a linearization is performed to determine or predict the adequacy parameter at the end of the kidney substitution treatment.

Abstract: An apparatus for preconditioning a filter media includes a reservoir containing a liquid; a pump operatively connected and in fluid communication with the reservoir; a filter housing operatively connected and in fluid communication with the reservoir and the pump, and having a filter media disposed therein; a control unit operatively connected to the pump; and wherein the pump is operable to circulate the liquid through the filter media to wet and remove air from the filter media prior to installation of the filter media in a processing application.

Abstract: A water treatment system is provided having an encapsulate manifold with a reverse osmosis cartridge and one or more filter cartridges. The filter cartridge includes a detent for being received within a slot in the manifold head for secure locking engagement. The water treatment system further includes a single probe conductivity monitoring system for monitoring the performance of a reverse osmosis membrane. The water treatment system is also provided in a modular arrangement wherein manifold heads are physically and fluidly coupled together via a clip which interfaces with the modular manifold heads. The water treatment system also allows for a retrofit application to include a permeate pump. The cartridges are also designed to provide a minimum annular inlet gap to minimize spillage during changing of the cartridges.

Abstract: A solvent filtration and recovery system for filtration and recovery of a solvent-based liquid used in dry cleaning includes filtration tank having filter chamber with motor-driven spin filters which are selectively operated. A valve and conduit arrangement allows the liquid from dry cleaning to enter the filter chamber for filtering and flows out as filtered liquid while the spin filters are not rotating. The arrangement allows initial at least partial draining of the solvent-based liquid in the filter chamber after such filtration procedure. A recovery tank is in communication with the filtration tank through a main drain. A motor drives the spin filters during a recovery procedure, in which centrifugal force caused by the rotating spin filters for a predetermined amount of time removes by-product from the spin filters, which is drained off from the filtration tank. A reservoir stores the solvent-based liquid and receives the liquid from both the recovery tank and the filtration tank.

Abstract: A method for operating a water softening system (1) comprising an automatically adjustable blending means for mixing a blended water flow V(t)blended from a first, softened partial flow V(t)part1soft and a second untreated water partial flow V(t)part2raw and comprising an electronic control means (11), wherein the control means (11) readjusts the adjustment position of the blending means by means of one or more experimentally determined instantaneous measured values in such a fashion that the water hardness in the blended water flow V(t)blended is adjusted to a predetermined desired value (SW), is characterized in that the control means (11) ignores at least one of the one or more instantaneous measured values for readjustment of the adjustment position of the blending means in one or more defined operating situations, and instead uses the respectively last corresponding measured value that was valid prior to occurrence of the defined operating situation, or a standard value for the corresponding measur

Abstract: A device for generating micro- and nanoflow mobile phase gradients for high performance liquid chromatography includes a generator of micro- and nanoflows of at least two mobile phases in different percentage compositions; an n-position gradient distributor having inlet and outlet ports and n couples of ports for a like number of capillary loops, each selectively connectable at one end with the inlet port and at its other end to the outlet port, which in turn is connectable to an analytical circuit that includes a chromatographic column and a detector; a micro- and nanoflow meter connected to the analytical circuit; a flow deviator having an inlet connected to the outlet of the gradient distributor, one outlet connected to a discharge and another outlet connected to the micro- and nanoflow meter, and a control unit that includes means of control of the generator of micro- and nanoflows such to create the different mobile phase mixture compositions, means for controlling the gradient distributor, means for con

Abstract: The present invention relates to systems and processes of wastewater treatment and, in particular, to systems and methods of treating wastewater utilizing biological treatments utilizing two mixed liquor recycle streams for nutrient removal.

Abstract: A dialysis system includes a first fluid heater, a second fluid heater, a supplemental power source and a logic implementer.

Abstract: Disclosed is a method of controlling a real-time oxidation-reduction potential in a hot water system undergoing a wet layup sequence to inhibit corrosion in the hot water system. The method includes separating the wet layup sequence into a plurality of phases. Each phase is either short-term or long-term and a subset of the short-term phases is optionally transitional. The method further includes defining one or more zones in the hot water system. At least one of the defined zones is selected for each phase and one or more of the selected zones include at least one ORP probe operable to measure the real-time ORP and communicate with a controller. The ORP probe(s) either intermittently or continuously measure the real-time ORP at operating temperature and pressure at one or more of the selected zones in one or more of the phases and transmit the measured real-time ORP to the controller. The real-time ORP is assessed to determine whether it conforms to an ORP setting for that phase.

Abstract: Ballast and/or cooling water biocidal treatment and disinfection systems and techniques are provided. The systems utilize oxidation reduction potential control to regulate addition, or concentration of an electrocatalytically generated biocidal agent to disinfection levels in ship buoyancy and to biofouling levels in ship cooling water systems. The disinfection and biofouling control systems provide suitable treatment while reducing the potential for corrosion of ship components and, in some cases, undesirable disinfection byproducts.

Abstract: For specifying a cause of generation of a water level abnormality alarm in a wire-cut electric discharge machine, stopping supply of a machining liquid to a machining tank when the alarm is generated, draining the liquid; measuring an amount of change in the water level per unit time that is detected by the water level detecting unit; and displaying a question to an operator about the measured amount of change in water level and the state of a water level adjusting mechanism. The operator manually inputs an answer to the displayed question, and specifies, from the answer input by means of the inputting unit, a part which causes the generation of the alarm.

Abstract: A method and apparatus for the air-free filling of the blood side of a hemodialysis apparatus with a physiological electrolyte solution and for the venting of the blood side of a hemodialysis apparatus during operation includes using a chamber in a blood-removing line system. The blood-removing line system, including the chamber arranged therein, is filled with a physiological electrolyte solution, with a valve arranged above the chamber and connected thereto being opened to fill the chamber completely with the physiological electrolyte solution until it comes into contact with a hydrophobic filter arranged above the valve.

Abstract: A water container having a germicidal water purification unit. Water stored in a reservoir passes through a conduit that extends through an array of light sources that operate in at least one of the visible light frequency range and the ultraviolet frequency range to purify the water. The light sources are activated, preferably on a selected as needed basis, by a power supply.

Abstract: The separation of particles in or from liquids is a necessary method in many procedures in biotechnology, biological research, diagnostic, and treatment of diseases. Commonly, methods are used which are based on differences in density (sedimentation) or size (filtration) of the particles. The invention discloses a device which can be used to concentrate particles within a cylinder by means of a free movable positioning of at least one separating membrane and one plunger within the cylinder. The device is suitable for the time unlimited use in a closed circuit. The invention further discloses a method for the preferable continuous separation of particles.

Abstract: The invention relates to blood processing apparatus comprising a cabinet (2) defining at least an interior housing (6) and presenting an aperture (6a) for allowing access from outside into said housing. The apparatus has a user interface (13) mounted in a movable manner on the cabinet between at least a first position, where the user interface is adjacent to the cabinet in correspondence of said aperture, and a second position, where the user interface is spaced apart from the aperture and opens the access to said housing.

Abstract: A blood purification apparatus includes a blood circuit, a blood purifying device, a first valve, a discharge line, a second valve, and a detection device. The blood circuit has an arterial blood circuit and a venous blood circuit. The first valve opens and closes the venous blood circuit. The second valve opens and closes the discharge line. The detection device detects whether a priming solution is replaced with blood in an end portion of the venous blood circuit at an upstream side from the first valve. The blood purification apparatus automatically turns the first valve from a closed position to an open position and the second valve from an open position to a closed position, respectively, when the detection device detects the priming solution being replaced with the blood.

Abstract: The present invention is directed to processes and business methods and wastewater treatment units for converting the waterborne residuals from wastewater generated by food processing plants into an ingredient suitable for use in animal feeds. The ingredient produced by the processes of the present invention has a high protein content and can be used as a replacement for conventional sources of animal feed protein such as fish meal.

Abstract: A medical apparatus comprises a user interface for setting parameters and includes: a screen for visualizing values of said parameters, a main control unit connected to the interface, a first memory and a video memory both connected to the main control unit for storing data corresponding to images on screen; the main control unit allows setting of a new value for a parameter, displays the new value on a screen region, stores the new value in the first memory, captures from the video memory data representative of said screen region, verifies from said representative data if the displayed value corresponds to the value in the first memory. A method for setting up a medical apparatus is also disclosed.

Abstract: A fluidized bed reactor for removing phosphorus and nitrogen from wastewater has a column comprising a number of sections. The diameter of the column changes stepwise between the sections. A flow velocity in excess of 100 cm/min is maintained in a lowermost one of the sections and lower flow velocities are maintained in subsequent sections. A struvite supersaturation ratio is controlled in part by recycling wastewater from an outlet of the column. Struvite pellets are removed periodically from the bottom of the column.

Abstract: A system for removing contaminant from sulfur to a level that allows re-processed sulfur to reenter a supply chain. The system melts contaminated sulfur, filters the molten sulfur, and then dispenses the less contaminated sulfur after filtering it. More specifically, solid contaminated sulfur enters a settling tank, while heated molten sulfur circulates through the system and the settling tank. The circulation of the molten sulfur assists in the melting process of the solid sulfur, allowing the solid sulfur to melt efficiently. In preferred embodiments of the system, the system uses steam jacked sulfur lines and steam tracing to maintain temperatures for melting the solid sulfur and maintaining the molten state of the sulfur circulating through the system. Furthermore, the system comprises a programmable logic controller, which controls motors, pumps, valves, and environment monitoring instruments.

Abstract: The portable dialysis machine may include an enclosure having a removable base. There may be a front panel having associated therewith multiple external connectors, smart function keys, a touch panel element and a voice activated sensor. The front panel may be in communication with an electronic circuit element having a controller in communication therewith. There may be a blood flow element and a hydraulic flow element. A water reservoir and power supply may be included. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract: Systems, methods and apparatus are provided for utilizing a substantially condensed phase cryogenic fluid for the purpose of remediation and retrieval of, e.g., spilled crude oil and other “oil spill”-related products from marine/aquatic and terrestrial environments. In some implementations, systems and apparatus are provided for applying a substantially condensed phase cryogenic fluid to a volume of spilled oil, and further having structure for collecting the spilled oil. Some implementations are environmentally-neutral. Substances other than oil may be remediated as well.

Abstract: According to one embodiment, a power recovery apparatus used in a desalination apparatus including a reverse osmosis membrane which extracts fresh water from seawater and ejects concentrated water includes a pressure conversion section and a seawater supply section to collect energy of the concentrated water. The pressure conversion section includes a movable part dividing inside of the conversion section into first and second spaces, moves the movable part by causing the first space to receive the concentrated water, and pushes out seawater filled in the second space by the movable part to output the seawater. The seawater supply section merges the seawater from the pressure conversion section with the seawater supplied to the reverse osmosis membrane.

Abstract: A system allowing the wireless transfer of data between a fluid filtering apparatus having a controller and a filter when the filter is positioned within the fluid filtering apparatus is described. The system includes a reader circuit and tag circuit in which the tag circuit includes read-only information and an enable bit responsive to a disable signal from the reader circuit to permanently de-authorize use of the filter with the fluid filtering apparatus. The controller is operatively connected to the reader circuit for interpreting the coded information and may modify or eliminate fluid flow within the fluid filtering apparatus, and/or provide a visible or audible warning to the user on the basis of filter manufacturer specifications such as volume and/or time of filter use.

Abstract: The present invention describes a system and method for supplying electrical power to a device, such as a filter element, located within a housing. In one embodiment, a conductive coil is embedded into the housing base, and a second coil is embedded into the filter element. Current is then passed through the coil in the housing base. Through induction, a current is created in the second coil in the filter element, in much the same way as a transformer functions. This inductive field may interfere with the operation of the various electronic functions, such as communications, sensing or other activities. To overcome this issue, an energy storage component, such as a capacitor, is included in the filter electronics. In this way, the power generated by the inductive field can be stored, and used when the inductive field is no longer present.

Abstract: A fluid filter assembly including a flexible and formable enclosure so as to be useable in many filter applications. The enclosure defines a portion of a fluid flow path residing entirely within the filter assembly, eliminating any fluid contact within the remaining portions of the filter assembly. This flow path is advantageous to reduce the possibility of contamination and to ease in cleaning and maintenance of a device utilizing the filter assembly. The enclosure may be formed of UV-transparent material to allow for UV treatment of fluid passing though the filter assembly. Electronic controls may be combined with the filter assembly to control and monitor fluid flow. Check valves or other closure devices also may be included with the filter assembly to facilitate easy filter changes.

Abstract: A dialysis system includes a first fluid heater, a second fluid heater, and a logic implementer configured to synchronize the duty cycles of the first and second heaters so that (i) power is not supplied to the first heater when power is supplied to the second heater and (ii) power is not supplied to the second heater when power is supplied to the first heater.

Abstract: A system for collecting, treating and disposing of waste fluid includes a station that features transfer, flushing and mixing pumps as well as a bowl that holds the waste fluid. The waste fluid is collected in a container mounted on a cart. The cart container connects to the station so that the waste fluid is transferred from the cart to the station bowl by the transfer pump. The flushing pump has an inlet that communicates with a source of water and a disinfectant dispenser. The flushing pump is used to flush both the cart container and the station bowl, the latter of which communicates with a drain system. The flushing pump also delivers disinfectant to the waste fluid in the station bowl. The inlet and outlet of the mixing pump communicate with the bowl so that it mixes the bowl contents. Buffer is provided to the circulating waste fluid until the pH level drops to a predetermined level.

Abstract: There is herein described the removal of fluid from fluid-contaminated waste solids and a method and apparatus for analysing and detecting the amount of oil in a fluid-contaminated waste material. In particular, there is described the removal of oil from drill cuttings at an offshore rig, onshore treatment facility and other oily wastes such as refinery wastes and an improved method and apparatus for analysing and detecting the amount of oil in solid material (e.g. drill cuttings) from an offshore rig, onshore treatment facility and other oily wastes such as from refinery wastes.

Abstract: An integrated fluid filtration and recirculation system and method are provided for re-circulating and filtering fluid that is used in well cleaning operations. The system is incorporated within an enclosure, which is transportable, such as on a vehicle trailer. The system has power generation capability, thereby making the system capable of operating as a stand-alone unit. Chemicals may be infused into the filtered fluid from an integral chemical supply allowing the system to also function as a treatment facility for the fluid. The components of the system are arranged in a linear fashion that enables the system to maintain a minimum profile for transport upon a conventional trailer, yet the system provides enough room within the enclosure to allow operators to repair/inspect each of the system components. The enclosure may be climate controlled, and the enclosure may include removable panels for operation of the system in temperate conditions when climate control is unnecessary.

Abstract: Methods and apparatus for efficient implementation and control of water treatment bypass loops combining ozone and chlorine injection are disclosed. Combined use of ozone and chlorine exploits high oxidation potential of ozone while retaining longer lived residual effectiveness of chlorine for high efficacy against contaminants, particularly biological and organic. Embodiments including automated monitoring and control of chlorine concentrations in presence of high oxidation potentials from ozone are disclosed, as is an inexpensive circuit for using a signal from a redox sensor for controlling output from an electrolysis cell. Also disclosed is a multipurpose enclosure that may be used, with different inserts, to implement an electrolysis cell, an ultraviolet ozone generator, an advanced oxidation unit, or an erosion feeder for adding dissolved salt to water for use in an electrolysis cell.

Abstract: A water treatment system including a UV bulb, a moisture detector, and a control circuit responsive to the moisture detector to terminate power to the bulb when moisture is detected. The moisture detector includes a nonconductive substrate and a pair of conductors on the substrate. When moisture is not present, the detector is nonconductive. However, when moisture accumulates on the detector, the moisture provides a conductive path between the conductors so that the detector becomes conductive. When moisture is detected, the control circuit terminates power to the bulb and/or provides an appropriate indication to the system user.

Abstract: A wastewater treatment system is provided comprising a biological reactor having a separation subsystem, a suspension system and a membrane operating system. The separation subsystem is constructed and arranged to maintain adsorbent material in the biological reactor with a mixed liquor. The suspension system is positioned in the biological reactor and is constructed and arranged to maintain adsorbent material in suspension with mixed liquor. The membrane operating system is located downstream of the biological reactor and is constructed and arranged to receive treated mixed liquor from the biological reactor and discharge a membrane permeate. In addition, a wastewater treatment system is provided comprising a first biological reaction zone, a second biological reaction zone and a membrane operating system. The first biological reaction zone is constructed and arranged to receive and treat the wastewater.

Abstract: A method and device for increasing the loading capacity of a chromatography column through dilution of a mobile phase at the head of the column. A strong mobile phase is provided for dissolving a sample. A sample is injected into the strong mobile phase, and subsequently diluted with a weak mobile phase. The resulting sample-containing weak mobile phase is passed through a chromatography column for retention and separation of the components of the sample.

Abstract: A system for regulating a reverse osmosis system to obtain zero wastewater includes a fresh water supply, a reverse osmosis apparatus, a concentrate storage tank and a permeate storage tank, a concentrate solenoid valve and a permeate solenoid valve, a permeate heater, an institutional dishmachine and a control system. The reverse osmosis apparatus filters water from the fresh water supply into a concentrate rinse stream and a permeate rinse stream. The concentrate storage tank and the permeate storage tank are downstream of the reverse osmosis apparatus and receiving the concentrate rinse stream and the permeate rinse stream, respectively. The concentrate solenoid valve and the permeate solenoid valve control the flow of the concentrate rinse stream and the permeate rinse stream, respectively, from their respective storage tank. The permeate heater heats the permeate rinse stream to a predetermined temperature.

Abstract: A dialysis machine that monitors an elapsed time and a number of accumulated hours during a current servicing interval is disclosed. The machine executes a machine-servicing algorithm on at least the elapsed time and the accumulated operating hours to generate a projected servicing interval duration. A servicing event indicator displays servicing event schedule information based on the projected servicing interval duration. A transfusion pump, similarly equipped, is also provided.

Abstract: There is provided herein a system for filtering oils and/or emulsions including one or more filtering devices comprising stacked filtering elements configured to filter oils and/or emulsions, one or more tanks configured to hold oils and/or emulsions, and one or more pumps configured to pump oils and/or emulsions.

Abstract: A dialysis system that includes a dialysis machine, a tube connected to the dialysis machine, and a sensor system. The sensor system includes a head having a slot configured to receive the tube and a plurality of sensors secured to the head adjacent the slot. At least one of the plurality of sensors includes a light emitting element configured to transmit light through the tube when the tube is disposed in the slot and a light receiving element configured to receive the light emitted by the light emitting element after the light passes trough the tube.

Abstract: A sewage treatment control device, a method and a sewage treatment system, are disclosed.

Abstract: Apparatus for managing a residential wastewater treatment system includes an in situ control unit that monitors an individual system. The control unit provides local control and alarms, and also sends status reports and/or alarms to a remote monitoring center via a telemetry device. The remote monitoring center makes information concerning the individual system available through a website.

Abstract: The disclosed HPLC flow schematic back-flushes the guard column with mobile phase once every operating cycle, the regular cleaning maintaining its effectiveness and useful life. This mobile phase flow reversal is accomplished by imposing a two position multiple port switching valve between the guard and separation columns. In one valve position, the mobile phase is pumped in one flow direction through both the separation and guard columns, but the switched valve maintains the same flow direction only through the separation column and reverses the mobile phase flow direction through the guard column, for effectively cleaning the guard column. Moreover, the mobile phase back flow is directed over the emptied sample drawing needle for cleaning it to reduce possible sample cross contamination. The improved flow circuits use basically only the typical HPLC system components, except for some insignificant modifications from existing injector designs.

Abstract: A multipurpose hemofiltration system and method are disclosed for the removal of fluid and/or soluble waste from the blood of a patient. The system continuously monitors the flow rates of drained fluid, blood, and infusate. When necessary, the pumping rates of the infusate, drained fluid and blood are adjusted to remove a preselected amount of fluid from the blood in a preselected time period. A supervisory controller can monitor patient parameters, such as heart rate and blood pressure, and adjust the pumping rates accordingly. The supervisory controller uses fuzzy logic to make expert decisions, based upon a set of supervisory rules, to control each pumping rate to achieve a desired flow rate and to respond to fault conditions. An adaptive controller corrects temporal variations in the flow rate based upon an adaptive law and a control law.

Abstract: The invention relates to a method for monitoring the supply of substitution liquid during an extracorporeal blood treatment and to an extracorporeal blood treatment unit equipped with a device for monitoring the supply of substitution liquid. The monitoring of the supply of substitution liquid is based on the measurement of pressure waves, which are generated by the substitution liquid pump, in the extracorporeal blood circulation system. A disturbance in the supply of substitution liquid is inferred when the amplitude of the pressure waves exceeds a predetermined limit value. The amplitude of the pressure waves is preferably monitored in the venous blood line.