Quick Lime Modification and Coagulation Performance of Nano-Inorganic Polymer Coagulants from Oil Shale Ash

Tong Sun; Lian Li Liu; Li Li Wang; Shu Ying Xu

doi:10.4028/www.scientific.net/AMR.661.28

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 661Quick Lime Modification and Coagulation...

Quick Lime Modification and Coagulation Performance of Nano-Inorganic Polymer Coagulants from Oil Shale Ash

Abstract:

The nano-inorganic polymer coagulant, poly-ferric-aluminum-silicate-sulfate (PFASS) modified by quick lime were prepared from oil shale ash, which were evaluated by treating sewage. The following results are discovered: The samples contain (CaO)_xSiO₂•zH₂O, Fe₂(SO₄)₂(OH)•5(H₂O), NaAl(SO₄)₂•(H₂O)₆ and other crystal; PFASS are complicated compounds by iron, aluminum, silicon and other ions rather than simple mixtures of raw materials. The optimal coagulant dosage is about 80-100 mg/L for the turbidity removal, and the range of the suitable dose is wider for COD removal, the optimal dose of quick lime is 2.5 g for turbidity removal and 3 g for COD removal.