TiCl4 응집슬러지의 건조 슬러지 및 슬러지 회분으로부터 화학적 인 회수

초록

We investigated the effects of leaching concentration (0.1 ~ 1.0 M) and time (1 ~ 120 min) on the phosphorus recoveryfrom ash and dried sewage sludge produced by titanium tetrachloride (TiCl4) flocculation by acidic (H2SO4 and HCl) oralkaline (KOH and NaOH) leaching. The extraction efficiencies of dried sludge were 2.7 ~ 12.6% for H2SO4, 2.5 ~ 10.5%for HCl, 3.6 ~ 9.6% for KOH, and 7.1 ~ 9.9% for NaOH with 1 M, and the maximum efficiency was obtained within 45 min. The maximum %P extracted of sludge ash was 83.1 for H2SO4, 80.2 for HCl, 51.2 for KOH, and 51.2 for NaOH with1 M, obtained within 45 min. The rate constants (min−1) for the leaching of P from sludge ash were found to be 1.199 forH2SO4, 1.026 for HCl, 0.264 for KOH, and 0.622 for NaOH. The P leaching increased with the increase in leachingconcentration, and the maximum leaching for ash was obtained within 0.3 M, regardless of acidic or alkaline leaching. Theoverall results indicate that the ash of TiCl4 flocculated sewage sludge can be treated with H2SO4 to efficiently recover P.

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