| 摘要 |
PURPOSE: The present method for eliminating fluorine ion(F¬-) and hexavalent chromium ion(Cr¬6+) from industrial wastewater produce less amount of sludge, because sodium carbonate is far more soluble into water than lime ever been used. CONSTITUTION: The method includes the steps of (i) into a reduction reactor, injecting a chemical composition comprising, on the 100mL of chemical composition basis, CaCO3 0.50-1.00g, LiCO3 0.10-0.30g, NaHSO3 0.05-0.20g, CH3COOH(1+1) 25-50mL, and a balance of water so as to convert fluorine ion into insoluble fluoride as well as convert hexavalent chromium into trivalent chromium; (ii) introducing the wastewater into a neutralization tank containing 10-20% Na2CO3 to eliminate trivalent chromium ion.
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