TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The system comprises:(1) first vessel where two electrodes are located;(2) reservoir (18);(3) pump (26) connected to circulate electrolyte past two electrodes or between reservoir and first vessel;(4) treatment tank in fluid communication with reservoir;(5) first and second fluid conduits connecting reservoir to treatment tank;(6) treatment circulation pump disposed to cause electrolyte to flow from reservoir to treatment tank in first conduit and to flow from treatment tank to reservoir in second conduit;(7) reaction vessel where zincate-trapping material is present as unconsolidated powder;(8) agitator;(9) mechanism for dropping particles of material into electrolyte settling tank;(10) monitoring system for estimating remaining capacity of material, and having indicator and electrolyte conductivity sensor for detecting electrical conductivity of electrolyte;(11) current sensor; and(12) mechanism for adjusting composition of electrolyte by adding water, potassium hydroxide solution or sodium hydroxide solution.The reaction vessel comprises electrolyte passages for providing upflow of electrolyte through particles. The assembly comprises cartridge having inlet, outlet, first passage for fluid connection between inlet and outlet, electrolyte permeable barrier having first barrier, sack having electrolyte permeable walls, and fins projecting from inner wall of treatment tank. The remediation assembly comprises cover for opening and attached to enclosure. The barrier comprises mesh, electrolyte permeable membrane and apertured plate. The reservoir comprises removable cap (24). The enclosure comprises electrolyte permeable bag, and housing having inlet and outlet where material is disposed in passage extending between inlet and outlet. Preferred Condition: The mobile particles are confined in section of first passage between first barrier and second electrolyte-permeable barrier. The zincate-trapping material is located in fluid conduit through which electrolyte flows when pump is operating, or in reservoir or first vessel; and contained in assembly attached to removable cap or in porous bag.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The zincate-trapping material comprises alkaline earth element; calcium compound; calcium hydroxide, magnesium hydroxide, barium hydroxide and/or strontium hydroxide; mobile particles; immobilized material on surface of structure containing electrolyte within system; powder pressed into pellet having binder including PTFE, or swellable material including cellulose; powder consolidated into sheet having 1/32-3/8 inches thickness; or powder immobilized on sides of alkaline resistant sheet including nickel foil, polypropylene sheet, alkaline stable cermet sheet or flame retardant (FR)-4 board. The electrolyte comprises alkaline solution of potassium hydroxide and/or sodium hydroxide. The precursor comprises calcium oxide. Preferred Composition: The electrolyte is present at 5-50 wt.%. Preferred Parameter: The trapping material has less than or equal to 10 (preferably 0.01) mu m size. Preferred Process: The method comprises combining zincate in electrolyte and zincate-trapping material by reversible chemical reaction to obtain product insoluble in electrolyte; providing material by reacting precursor with water or electrolyte; hydrating calcium oxide; flowing electrolyte upwardly through particles to provide fluidized bed; settling particles and collecting; maintaining concentration of zincate in electrolyte below threshold concentration where zinc oxide precipitation occurs; and recycling material.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The zincate-trapping material comprises powder immobilized on beads including polypropylene or polyethylene beads; foam support including polypropylene or polyethylene foam; or porous support including foam, mat, mesh, filter bag or membrane. Preferred Condition: The material or particles of swellable material is adhered or affixed to beads, foam support or porous support by binder.