627results about "Grey water treatment" patented technology

A reactor has an aerobic tank, an anoxic tank and a sealed membrane tank with conduits for circulating mixed liquor between them. Permeation starts when the mixed liquor reaches a high level and stops when the mixed liquor reaches a low level. A sensor, for detecting the mixed liquor level, may stop and start permeation. Pressure builds in the membrane tank when membrane air is on. Transmembrane pressure is also provided by gravity flow or siphon. Membrane air generates an air lift which drives the mixed liquor circulation. The total amount of air provided by an air source is divided and varied in time between the membrane aerator and the process aerator. The process aerator acts as a screening inlet to the conduit to the membrane tank. Chemical maintenance cleaning is provided by gravity flow.

An economically viable process and system for centrally processing multiple loads of laundry with minimum environmental impact. A system and method of laundering whereby successive loads of laundry may be washed while continuously providing effective soil removal comprising at least partially recycled wash water from at least one previous wash cycle. The system and the method of using the same comprises filtering wash water with at least one filter to form wash retentate and wash permeate. The use of wash permeate in successive washes provides for reuse of chemicals and water recovery. A similar arrangement may be used with regard to the rinse water. Advantageously, one embodiment of the invention provides for the use of rinse retentate as make up water in the wash loop which increases water recovery and chemical recovery. Ultimately, the invention can reduce the production of gray water and recover chemicals used in the laundering process.

A washing machine with a circulated water treatment function and a control method therefor. The washing machine comprises a water holding barrel (2), a washing structure arranged inside the water holding barrel (2) and a circulated water treatment device arranged under the water holding barrel (2), wherein the circulated water treatment device comprises a flocculation treatment unit and a filtering unit, the flocculation treatment unit comprises a flocculation container (10) connected to the water holding barrel (2) and a flocculation agent dosing device (11) for dosing a flocculation agent into the flocculation container (10), and water is discharged from the water holding barrel (2) to the flocculation container (10) for flocculation treatment; and the filtering unit comprises a filtering container (12) and a filter net (13) arranged inside the filtering container (12), the filtering container (12) is in communication with the flocculation container (10) and the water holding barrel (2), respectively, for filtering the water having been flocculation-treated in the flocculation container (10) and discharging same again into the water holding barrel (2) for reuse. The washing machine circularly treats water by flocculation and filtration till the end of washing, in which the water is discharged into the circulated water treatment device for purification in the flocculation treatment unit and the filtering unit and finally discharged outside. The washing machine has the advantages of saving water resources, reducing water pollution and protecting the environment.

Modified polysaccharide polymers for use as anti-scalant and dispersant. The polymers are useful in compositions used in aqueous systems. The modified polysaccharides are also useful in detergent formulations, water treatment, dispersants and oilfield applications and as fiberglass binders. Such applications include a modified polysaccharide having up to about 70 mole % carboxyl groups per mole of polysaccharide ASU and up to about 20 mole % aldehyde groups per mole of polysaccharide ASU. The applications can also include a blend of modified polysaccharides and other synthetic polymers.

Hybrid copolymers for use as anti-scalant and dispersant. The polymers are useful in compositions used in aqueous systems. The polymers include at least one synthetic monomeric constituent that is chain terminated by a naturally occurring hydroxyl containing moiety. A process for preparing these hybrid copolymers is also provided.

In order to use so-called gray water for the flushing of toilets, for example in a conveyance such as a passenger aircraft, the gray water is passed through at least one filter, preferably through a coarse filter followed by a fine filter, into a treatment tank where it is anodically oxidized. The rinsing is performed by a pump that may be a rotary pressure pump or a piston cylinder pump. The pump passes the processed or oxidized water through an excess pressure valve and through at least one spray nozzle into a toilet bowl.