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.
Publication Name: Chemical Engineering
Subject: Engineering and manufacturing industries
ISSN: 0009-2460
Year: 2000
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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.
Publication Name: Chemical Engineering
Subject: Engineering and manufacturing industries
ISSN: 0009-2460
Year: 2000
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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.
Publication Name: Chemical Engineering
Subject: Engineering and manufacturing industries
ISSN: 0009-2460
Year: 2000
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