Experimental Study on Phosphorus-containing Wastewater Treatment by Acid Modified Fly Ash
Fly ash which was modified by various acids was used in the treatment of phosphorus-containing wastewater.Influence of various factors on the reactions was studied.Experimental results showed that fly ash was good at removing phosphorus from wastewater at pH from 4 to 10.Adding original fly ash 70 g/L and 80 g/L into the solution of containing 100mg/L phosphate after stirring and reaction for 40 min,the effluent can meet Grade II and I under the Integrated Wastewater Discharge Standard of GB9878-1996.Removal rate of phosphorus had improved significantly when wastewater was treated by sulfuric acid modified fly ash.The acid modified fly ash was good at removing phosphorus from wastewater at pH from 4 to 10.Adding the acid modified fly ash 7 g/L and 10 g/L into the solution of containing 100 mg/L phosphate after stirring and reaction for 5min,the effluent can meet separately Grade II and I of GB9878-1996.