A sequencing batch apparatus being manually or automatically operated for treating a contaminated water is described. The present invention specifically relates to the apparatus comprising an inlet pipe, a batch reactor, a chemical feeder means, at least one mixing means, a coarse bubble distribution means, a fine bubble distribution means, a liquid discharge means, and sludge discharge means for required liquid treatment, and further alternatively comprising a gas moving means, a gas pipe, a flow meter, an enclosure and a gas purification means for air emission control upon demand. The present invention further relates to an apparatus system comprising means for recovering precious metal, controlling optimum pH in an acid range, reducing hexavalent chromium to trivalent chromium, controlling optimum pH in a base range, oxidizing cyanide, destroying phosphite, separating flocs, exchanging metals, adsorbing contaminants, neutralizing an effluent, and controlling gas emission. The treated effluent can be safely discharged into a receiving water. The waste sludges, ashes and spent adsorbents containing metals, PCB, and other toxic organics are safely disposed of by cementation or solidification.

Sequencing batch liquid treatment

Processes are disclosed for recovering solid wastes containing elemental phosphorus. The wastes may cause serious environmental problems at phosphorus furnaces because elemental phosphorus is toxic to marine animals. Recovery of the wastes was considered for the following. 1. At phosphorus furnace plants making phosphoric acid as one of the products, when the objective is to produce only high-quality phosphoric acid. 2. At phosphorus furnace plants making elemental phosphorus as a final product, and the objective is to provide only high-quality phosphorus. 3. At plant sites where neither phosphoric acid nor phosphorus is produced. The processes include recycling the wastes to phosphorus furnaces. All of the phosphoric acid produced in 1 can be highly concentrated with low impurities content. In 2, all the low-quality phosphorus is recycled to the phosphorus furnaces and all the produce is high grade. In 3, phosphorus furnaces are not available at the plant site and recycling the solid wastes is impractical. In this case processes are disclosed for recovering the elemental phosphorus from the waste, converting the residue to granular fertilizer, and making suspension fertilizer from water containing elemental phosphorus.

Production of phosphorus and phosphoric acid

A process for removing nickel and phosphorus species from a spent electroless nickel plating solution is described. This process involves an initial precipitation of phosphite values from the plating solution, followed by oxidation of hypophosphite and remaining phosphite to phosphate values, and the final removal of phosphate and nickel by lime precipitation. The treated plating solution is then separated from the precipitants, such as by filtration, and preferbly contain less than 1 milligrams/liter of nickel and/or total phosphorus species. This process is a cost effective method for treating spent electroless nickel plating solutions which is readily adaptable for on-site use.

Treatment of electroless nickel plating baths

Toxic PH3 Catalytic Decomposition and High Purity Phosphorus Production by Amorphous Co-Based Alloy Nanomaterials

The invention relates to a process of extracting phosphorous acid from sodium hypophosphite slag, wherein a high purity phosphorous acid product is obtained specifically by a cation exchange method through decompression, distilling and crystallization. The process comprises the following steps: extracting calcium phosphate solid from a calcium phosphate in a calcium phosphate workshop and reacting with sodium carbonate; separating and purifying to obtain a sodium phosphite liquor; decompressing, evaporating and crystallizing the sodium phosphite liquor after cation exchange through D001 resin to obtain the high purity phosphorous acid product. The process is simple in process, less in energy consumption and high in product purity, and does not cause secondary pollution at the same time.

Recycle of calcium phosphate

An improved process is provided for preparing highly purified phosphorus acid from industrial waste materials which are produced as by-products from the manufacture of sodium hypophosphite. Such industrial waste materials contain substantial quantities of calcium phosphite, and appreciable quantities of various metals such as iron, magnesium, aluminum and arsenic. The process of the present invention comprises, in a preferred embodiment thereof, reacting a slurry of said waste materials with sodium carbonate to produce calcium carbonate as a precipitate and a solution of sodium phosphite. The sodium phosphite solution is then passed through a cation ion exchange resin in the hydrogen form to produce a highly purified phosphorus acid product having significantly reduced quantities of metallic impurities.

Joseph S. Wisnouskas

Papers

Process for preparing phosphorus acid from industrial waste materials