By E.R. Krishnan
Cutting-edge metals therapy and restoration applied sciences to help in opting for waste administration techniques.
Read Online or Download Recovery of Metals from Sludges and Wastewaters (Pollution Technology Review) (No. 207) PDF
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Additional resources for Recovery of Metals from Sludges and Wastewaters (Pollution Technology Review) (No. 207)
Anganese, nickel, lead, and 9 zinc. Because this type of precipitation IS widely used in industry. considerable data are available concerning ItS performance. Table 18 presents data on the effectiveness of hydroxide precipitation in the removal of soluble metal ions in commercial operations. Sulfide precipitation is effective in the ~val of cadmium, cobalt, copper, iron. mercury, manganese, nickel. er. tIn. and zinc. 9 Table 19 presents full-scale performance data for ~ulfide precipitation. Carbonate precipitation has bein cited as being effective in the removal of cadmium, lead.
Ay then be processed further for metals recovery. Typical chemicals often used to precipitate metals for aqueous streimS include caustic soda, lime. sodiu. sulfide. ferrous sulfide, soda ash, phosphoric acid/sodiu. phosphate, and sodium borohydr1de. Because wastewaters containing comp1exed metals may not be effectively treated by such chemical additions. the use of reducing agents may be reqUired for their precipitation fra- the water matrix. The reduction process involves the transfer of electrons to the chemical being reduced (reductant) from the che-ica1 initiating the transfer (the reducing agent).
The heart of all these systems Is the plasma torch, which consists of a closely spaced pair of electrodes Installed In a furnace to produce an electrical arc. A process gas Is Injected into the space between the electrodes. This gas can be Inert, oxidizing, or reducing In nature. , carbon monoxide, water).!! The product collection system can consist of a condenser or a combination condenser and baghouse. A high-temperature flUid-wall reactor uses radiative heat to pyrolyze waste components and causes them to fona elements or simple compounds.