A portable liquid-filtration device includes an inlet port, a filtering portion including a filtering medium and fluidly coupled to the inlet port, a filtered-liquid output port fluidly coupled to the filtering portion, a flush port fluidly coupled to the filtering portion, and a manually activated pump assembly fluidly coupled to the inlet port, filtering portion, output port and flush port. The pump assembly is configured, when activated, to create a negative fluid pressure at the inlet port and a positive fluid pressure at the output port and the flush port. As a consequence of activation of the pump assembly, the filtering portion receives unfiltered liquid from the inlet port, the output port receives from the filtering portion only liquid traversing the filtering medium in a first direction, and the flush port receives from the filtering portion liquid traversing the filtering medium in a second direction different from the first direction.

A decentralized water treatment unit is for purifying untreated water to purified water for human consumption. The unit includes i) a filtration module, having at least one filtration membrane configured to, during a filtration cycle, purify the untreated water; and ii) a cleaning module, having an electrolytic cell configured to, during a generation cycle, generate a cleaning solution of predetermined composition from a chloride starting solution. The cleaning module is further configured to, during a cleaning cycle, pump the cleaning solution through the filtration module to clean the at least one filtration membrane.

A membrane separation type activated sludge treatment method according to an aspect of the present invention includes a step of performing biological treatment on waste water and a step of performing membrane separation on water having been treated in the biological treatment step. The membrane separation step employs a plurality of filtration modules including a plurality of hollow fiber membranes arranged adjacent to one another and oriented in one direction and a pair of holding members fixing both ends of the plurality of hollow fiber membranes, and a plurality of cleaning modules supplying air bubbles from beneath the filtration modules. An amount of treated water sucked by the filtration modules and an amount of air bubbles supplied by the cleaning modules are varied in response to variations in an inflow rate of the waste water in the biological treatment step.

The present invention concerns a method for cleaning a filtration system under operation. The filtration system comprising a hydraulic circuit Cp recycling the permeate stream to the feed side of the membrane and/or a hydraulic circuit Cr recycling the retentate stream to the feed side of said membrane. The method comprises injecting an amount of a chemical product into the filtration system in the hydraulic circuit Cp or in the hydraulic circuit Cr or upstream of the cross-flow filtration membrane, setting the proportion of recycled permeate stream or recycled retentate stream collected in the hydraulic circuit Cp and/or Cr to enable the recycling of a significant amount of unreacted chemical product having passed through said cross-flow filtration membrane to the feed side of said cross-flow filtration membrane, as well as a filtration system for carrying out said method.

Systems and methods for rapid flushing of a membrane-based fluid filtration system are disclosed herein. During flushing, a membrane of the system can be decoupled from other portions of the system and brine can be flushed from the membrane separate from the other portions of the system. In some embodiments, the membrane can be connected to a pump to form a flushing loop that is separate from the flushing loops of the main system to flow the flushing fluid therethrough. The flushing fluid through the membrane can be optimized and set based on a flow rate of the membrane to prevent damaging the membrane while minimizing flush time of the membrane relative to the flush time of the system.

Embodiments of the invention provide a filter for use in filtering a fluid slurry that includes particles of varying size, such as pool water including debris. The filter is in electrical communication with a sensor and includes a housing having an inlet to receive the fluid slurry, an outlet, and an internal chamber. An actuator can be coupled to the filter media to move at least a portion of the filter media to vary a dimension of the pores. The filter also includes a controller connected to the actuator that is capable of receiving a signal from the sensor and controls the actuator to change the dimension of the pores based on the signal.

Various embodiments relate generally to a filtration apparatus. The filtration apparatus may include a filtration module having an inner longitudinal chamber and an outer annular chamber surrounding the inner longitudinal chamber. The filtration module may further include a base module coupled to an end of the filtration module, and an integrated check valve module coupled to a corresponding end of the inner longitudinal chamber of the filtration module through the base module. The base module and the integrated check valve module may be configured to define an annular base chamber adjacent to a corresponding end of the outer annular chamber of the filtration module. The integrated check valve module may include a housing having a first port for external fluid communication, a second port to interface with the annular base chamber and a third port to interface with the inner longitudinal chamber.

A membrane separation type activated sludge treatment method according to an aspect of the present invention includes a step of performing biological treatment on waste water and a step of performing membrane separation on water having been treated in the biological treatment step. The membrane separation step employs a plurality of filtration modules including a plurality of hollow fiber membranes arranged adjacent to one another and oriented in one direction and a pair of holding members fixing both ends of the plurality of hollow fiber membranes, and a plurality of cleaning modules supplying air bubbles from beneath the filtration modules. An amount of treated water sucked by the filtration modules and an amount of air bubbles supplied by the cleaning modules are varied in response to variations in an inflow rate of the waste water in the biological treatment step.

Disclosed is an automated tangential flow filtration (TFF) perfusion bioreactor for culturing eukaryotic cells, useful for manufacturing a purified protein of interest, such as, but not limited to, a recombinant or naturally occurring protein and/or a therapeutic or other medically useful protein. The disclosed TFF perfusion bioreactor system can operate at high cell densities for long production cultivation periods (13-90 days) that provide the greatest efficiencies, whether in batch mode, continuous, or semi-continuous biologics manufacturing platforms.

Disclosed is a method for use in cleaning a cross-flow processing system. The processing system comprising a feed pump for feeding a fluid to a baseline of the processing system, and at least one filtration unit. The at least one filtration unit comprising a filtration membrane and a retentate outlet fluidly connected to the baseline for guiding retentate of the at least one filtration unit to the baseline. The processing system further comprising a loop pump for feeding the fluid in a predetermined flow direction to the at least one filtration unit. The loop pump being fluidly connected to the baseline and the at least one filtration unit so that a loop is formed comprising the loop pump, the at least one filtration unit, and the retentate outlet.