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KMID : 0896219830070010261
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Journal of Daegu Health College
1983 Volume.7 No. 1 p.261 ~ p.275
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Alum Recovery from wasts Sludge of water Treatment Plant
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Cho Byoung-Rak
Lee Won-Shik
Kang Jae-Hyoung
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Abstract
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An investigation, from waste sludge of G and S water treatment plant in Daegu city, was carried out for the recovery of alum by the acidification with H₂SO₄. The results are shown as follows; 1. The efficiency of the alum recovery could be 90 and 80 percent at pH 1 and 2, respectively. And when the molar ratio of H₂SO₄ to total aluminum is 1.5 : 1, alum had recovered 90 percent for the S plant and 70 percent for the G plant. 2. The sludge settling velocities by the aluminum dissolution was best effective at pH 1, but it was decreased as pH value is to increase otherwise the effects of sludge volume and suspended solid reduction were increased proportionally by the aluminum dissolution. 3. In the coagulation criticizing of the fresh alum and recovered alum from waste sludge, the recovered alum was superior to fresh alum in the low turbidity of the raw water while fresh alum was more efficient than recovered alum at the level of heigher turbidity. 4. It was proposed to a probable process for the reuse of recovered alum from waste sludge. Moreover, in considering of the sludge treatment problems, it can be expected that the reuse of recovered alum is more economics than commercial alum.
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