THE POSSIBILITY OF ELIMINATING METAL IONS FROM INDUSTRIAL SEWAGE BY USING ALUMINUM HYDROXIDE

Aluminum hydroxide is an amphoteric hydroxide, and it not only can react with acid and but it’s also react with alkali. Aluminum hydroxide can remove suspended solids due to its adsorption characteristics. Ionization formula of aluminum hydroxide in acidic solution and the alkaline solution is different. Tetrahydroxoaluminate will form in the acidic solution, and ferric ion will be ionized in the alkaline solution Atomic absorption spectrometer (AAS) is a widely utilized analytical instrument. According to the amount of light be absorbed by atom, the result of the sample solution can be measured. Solubility of aluminum hydroxide is different in different temperatures and pH. From pH 4 to pH 6, the solubility of aluminum hydroxide is decrease along with the pH ascending. From pH 6 to pH 12, the solubility is increasing. Aluminum hydroxide was having significant effect for eliminating the metal ions from industrial sewage. But, in order to reach the highest efficiency, each metal ion has a specific removal condition