Abstract: A wash water processing apparatus of reusing wash water includes: a washing processing part washing a subject to be washed; a wash water accommodation part into which processed water used in a washing process in the washing processing part is once accommodated; a sterilization and purification unit causing, while acting with an ozone supply function, ozone water to be contained in the processed water flowing through the wash water accommodation part in a circular manner; and a filtration mechanism part configured to include a filter and an ion-exchange resin and sequentially filtrating the processed water to be reused as wash water in the washing processing part, as the ozone water is supplied as the processed water is mixed to dilute an ozone concentration in the wash water accommodation part. In a state where the ozone concentration is adjusted, the processed water is passed through the filter and the ion-exchange resin.

Abstract: A wash water processing method and a wash water processing apparatus in a simple structure capable of effectively decomposing organic matters and killing bacteria contained in wash water, extending the life of a filter of a filtration apparatus and an ion-exchange resin and, furthermore, extending a bacteria-killing/washing interval of a washing processing part. In the wash water processing apparatus (11) and the washing method, a wash water accommodation part (12) into which processed water processed in a washing processing part (10) flows and a filtration mechanism part (14) are connected and the wash water accommodation part has connected in a circulatable manner thereto an inflow flow path and an outflow flow path of a sterilization and purification unit which organically couples respective functions of an ozone supply part which supplies ozone, an ultraviolet irradiation part which irradiates with ultraviolet rays, and a photocatalysis part which causes a photocatalyst to act.

Abstract: A hot working material of corrosion resistant copper-based alloy having a metal composition of 61.0 weight percent to less than 63.0 weight percent copper, 1.0 weight percent to 3.5 weight percent lead, 0.7 weight percent to 1.2 weight percent tin, 0.2 weight percent to 0.7 weight percent nickel, 0.03 weight percent to 0.4 weight percent iron, 0.02 weight percent to 0.10 weight percent antimony, and 0.04 weight percent to 0.15 weight percent phosphorus, with the balance composed of zinc and inevitable accompanying impurities. The alloy is subjected to hot working and subsequent heat treatment at 500.degree. C. to 600.degree. C. for 30 minutes to 3 hours and sufficient that the alloy has an .alpha. single-phase structure and addition elements are dispersed uniformly in the entire structure.

Abstract: The present invention provides copper base alloys containing copper and zinc as the main components with additions of tin, lead, nickel, iron and beryllium and one of the objects of the present invention is to increase not only the corrosion resistance, but also, the machinability by defining the range of the composition as 63.0-66.0 wt.% copper, 1.2-2.0 wt.% tin, 1.0-2.0 wt.% lead, 0.1-1.0 wt.% iron, 2.0 wt.% or less of nickel, 0.1 wt.% or less of beryllium and the rest being zinc with inevitable impurities. In another aspect of the invention, the above composition is subjected to a heat treatment between about 350.degree. and 550.degree. C for about 1 to 10 hours after hot and cold working which produces a further significant improvement in machinability without decreasing either the corrosion resistance or the mechanical properties.

Abstract: A copper alloy which excels in corrosion resistance, mechanical strength and castability and is suitable for the manufacture of valves, cocks and related cast parts. The copper alloy comprises by weight 5.0 - 6.5% aluminum, 0.2 - 0.5% silicon, 0.2 - 0.5% tin, 0.2 - 4.0% zinc, 1.0 - 1.5% lead and 1.0 - 3.0% iron and the rest being composed of copper.