Electrolytic oxidation removes organic pollutants from water

Article Abstract:

Ebara Research Co has developed a new process for treating wastewater containing organic pollutants, which it calls hydrothermal electrolytic oxidation. The procedure uses oxidizing agents such as air and hydrogen peroxide, which are added to the wastewater, as well as inorganic chlorides for enhancing wastewater electrical conductivity and oxidation. Senior researcher Massahiro Serikawa claims the electrolytic oxidation of the solution hastens the decomposition of the organic pollutants to nitrogen, carbon dioxide and water.

Sewage Systems, Sewage Treatment Facilities, Sewer systems, Ebara Research Co.

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Sewage sludge: a new source of phosphate fertilizer

Article Abstract:

Sanki Engineering Co and Japan Sewage Works Agency have developed a new process for recovering phosphates from the ashes of incinerated sewage sludge. The ashes are first mixed with dolomite, which contains magnesium carbonate and calcium carbonate. The mixture is then melted in an electric furnace at 1,400 degrees C for 10 min and then quickly cooled and crushed. The biggest advantage of the process is the low cost of raw materials since the disposal cost of incinerated ash is only 5 cents per kg in Japan, while phosphate rock, the usual source of phosphate fertilizers, cost 12 cents per kg.

Phosphate, Potash & Other Fertilizers, Phosphatic Fertilizer Manufacturing, Fertilizer industry, Sanki Engineering Co

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A better way to make high-porosity metals

Article Abstract:

Mitsubishi Materials has developed a new process of producing metals and alloy sheets with a porosity between 91 to 96%. The process uses metal powders, an organic binder, solvent and a foaming agent that are molded into thin sheets, using a roller and a doctor blade. The sheets are then heated at a temperature that decomposes the foaming agent. They are then baked at about 1,000 degrees C to sinter the metal powders, producing porous sheets up to 2 mm thick. Mitsubishi has already used the process in making 316 stainless steel, MA600 and Hastelloy C-276.

Iron and Steel Mills, Stainless Steel, Mitsubishi Materials Corp.

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