A water treatment system including an enclosure for water to be treated, a multiplicity of biomass carriers located within the enclosure, at least one airlift in the enclosure for raising the water and the biomass carriers and at least one mechanical biomass carrier accumulated residue removal apparatus operative to remove accumulated residue from the biomass carriers.

A water treatment system including an enclosure for water to be treated, a multiplicity of biomass carriers located within the enclosure, at least one airlift in the enclosure for raising the water and the biomass carriers and at least one mechanical biomass carrier accumulated residue removal apparatus operative to remove accumulated residue from the biomass carriers.

Provided is a piezoelectric material that is free of lead and potassium, has satisfactory insulation property and piezoelectricity, and has a high Curie temperature. The piezoelectric material includes a perovskite-type metal oxide represented by the following general formula (1): General formula (1) (Na.sub.xM.sub.1-y)(Zr.sub.z(Nb.sub.1-wTa.sub.w).sub.y(Ti.sub.1-vSn.sub.v).sub.(1-y-z))O.sub.3 where M represents at least any one of Ba, Sr, and Ca, and relationships of 0.80≦x≦0.95, 0.85≦y≦0.95, 0<z≦0.03, 0≦v<0.2, 0≦w<0.2, and 0.05≦1−y−z≦0.15 are satisfied.

A surface treatment method for metal parts includes a polishing step of supplying and discharging a cleaning liquid into and from a barrel tub while mass including a metal part and a medium is caused to flow in the barrel tub, so that a surface of the metal part is polished. The polishing step is carried out at least once. The polishing step includes a final finish polishing process in which a final finish medium which is free from abrasive grain or which consists of a synthetic resin base material and is free from abrasive grain or which is made by binding abrasive grain of not more than 10 wt % and a synthetic resin binding material together and is free from alumina is used as the medium.

The present invention relates to a process for cleaning a solid support of a fermentation reactor for the production of alcohols by fermentation using a sugary fluid, the solid support comprising a polyurethane foam inoculated with a biomass produced by a solvent-producing strain belonging to the genus Clostridium, the process comprising placing the solid support in contact with a fluid originating from the fermentation must enriched in alcohol and/or acetone and/or an aqueous solution at basic pH.

The present invention relates to a process for cleaning a solid support of a fermentation reactor for the production of alcohols by fermentation using a sugary fluid, the solid support comprising a polyurethane foam inoculated with a biomass produced by a solvent-producing strain belonging to the genus Clostridium, the process comprising placing the solid support in contact with a fluid originating from the fermentation must enriched in alcohol and/or acetone and/or an aqueous solution at basic pH.

A self-cleaning ultraviolet wastewater disinfection unit and method are provided. The disinfection unit has a wastewater treatment chamber comprising a UV lamp for treating/disinfecting the wastewater. A plurality of pieces of media may be positioned in the treatment chamber. When wastewater is present in the chamber, gas is injected into the wastewater through a gas inlet conduit. The gas agitates the pieces of media in the wastewater to cause the pieces of media to rub against the UV lamp unit to remove matter that has accumulated on the UV lamp unit. The removal of accumulated matter on the UV lamp and other surfaces in the chamber may improve the efficiency and effectiveness of the disinfecting unit. Furthermore, the cleaning operation may be performed automatically at scheduled periods to increase the time between major cleanings of the unit.

The present disclosure is directed to a method for in-situ (e.g. on-wing) cleaning one or more components of a gas turbine engine. The method includes injecting a dry detergent into the gas turbine engine. Further, the dry detergent contains a plurality of detergent particles having varying particle sizes. More specifically, the plurality of detergent particles includes a first set of particles having a median particle diameter within a first micron range and a second set of particles having a median particle diameter within a second micron range. Further, a median of the second micron range is larger than a median of the first micron range. In addition, the method includes circulating the dry detergent through at least a portion of the gas turbine engine so as to clean the one or more components thereof.

The present disclosure is directed to a system and method for in-situ (e.g. on-wing) cleaning of gas turbine engine components. The method includes injecting a dry cleaning medium into the gas turbine engine at one or more locations. The dry cleaning medium includes a plurality of abrasive microparticles. Thus, the method also includes circulating the dry cleaning medium through at least a portion of the gas turbine engine such that the abrasive microparticles abrade a surface of the one or more components so as to clean the surface.

A method of cleaning residual resin from an additively manufactured object, includes: (a) enclosing an additively manufactured object in an inner chamber of a centrifugal separator, the additively manufactured object including a light polymerized resin with a surface coating of viscous, unpolymerized, residual resin; (b) flooding the chamber with a volatile organic solvent vapor without contacting liquid organic solvent to the object, the vapor present in an amount sufficient to reduce the viscosity of the residual resin; and (c) spinning the additively manufactured object in the chamber to centrifugally separate at least a first portion of the residual resin from the object.