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- Title
Phosphate Removal from Digested Sludge Supernatant Using Modified Fly Ash.
- Authors
Ke Xu; Tong Deng; Juntan Liu; Weigong Peng
- Abstract
The removal of phosphate in digested sludge supernatant by modified coal fly ash was investigated in this study. Modification of the fly ash by the addition of sulfuric acid could significantly enhance its immobilization ability. The experimental results also showed that adsorption of phosphate by the modified fly ash was rapid with the removal percentage of phosphate reaching an equilibrium of 98.62% in less than 5 minutes. The optimum pH for phosphate removal was 9 and the removal percentage increased with increasing adsorbent dosage. The effect of temperature on phosphate removal efficiency was not significant from 20 to 40 °C. X-ray diffraction and scanning electron microscope analyses showed that phosphate formed an amorphous precipitate with water-soluble calcium, aluminum, and iron ions in the modified fly ash.
- Subjects
PHOSPHATE removal (Sewage purification); FLY ash; X-ray diffraction; SCANNING electron microscopes; ORGANIC compounds removal (Sewage purification); SULFURIC acid; TEMPERATURE effect
- Publication
Water Environment Research (10614303), 2012, Vol 84, Issue 5, p411
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143012X13347678384323