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- Title
Sulphuric Acid Modification of Fly Ash for Enhanced Phosphate Removal from Wastewater.
- Authors
Ke Xu; Jianyun Li; Tong Deng; Juntan Liu
- Abstract
The modification of fly ash with sulphuric acid for the enhanced phosphate removal was investigated. In the modification process the fly ash was slurried with water and blended with concentrated sulphuric acid, followed by curing. It was found that modification of fly ash with sulphuric acid could significantly enhance the phosphate immobilization ability of the fly ash. The optimum modification conditions were determined as follows: the proportion of water: concentrated sulphuric acid : fly ash was 1.5 mL : 0.3 mL : 5 g, reaction temperature and time was 100°C and 1.5 h. In the phosphate immobilization process it was found that the optimum pH for phosphate removal was 7.0. The removal percentage of phosphate increased with the increase of adsorbent dosage. Adsorption of phosphate by the modified fly ash was rapid, the removal percentage of phosphate could reach the maximum in 10 minutes. The optimum temperature for phosphate removal was between 20°C and 30°C. The adsorption of phosphate by the modified fly ash could be described well by Langmuir isotherm equation, the Langmuir constant Q0 was 4.37 mg/g.
- Subjects
PHOSPHATE removal (Sewage purification); FLY ash; SULFURIC acid; LANGMUIR isotherms; TEMPERATURE effect
- Publication
Nature Environment & Pollution Technology, 2018, Vol 17, Issue 3, p1011
- ISSN
0972-6268
- Publication type
Article