WANGXue-ke,ZHANGChun-miao,LICai-ran,et al.Recovery of Aluminum in Sludge from High Efficiency Sedimentation Tank by Acidification Method and Its Phosphorus Removal Performance[J].China Water & Wastewater,2023,39(21):94-98.
Recovery of Aluminum in Sludge from High Efficiency Sedimentation Tank by Acidification Method and Its Phosphorus Removal Performance
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第21期
Page:
94-98
Column:
Date of publication:
2023-11-01
- Keywords:
- sludge from high efficiency sedimentation tank; acidification method; recovery of aluminum; phosphorus removal
- Abstract:
- High-concentration aluminum was leached and recovered by acidification method according to the characteristics of sludge from high efficiency sedimentation tank, so as to improve the recovery rate of aluminum. The effects of pH and reaction time on the leaching concentration of aluminum were investigated, and the removal performance of phosphorus from wastewater was explored by using the recovered high-concentration aluminum liquid as the phosphorus removal agent. The aluminum leaching concentration increased with the decrease of acidification pH. After acidification for 30 min, the reaction was basically completed, and the subsequent leaching concentration of aluminum tended to be stable. The concentration of aluminum in the recovered liquid was as high as 3 000 mg/L. When the dosage of the recovered liquid was 2.0%, the removal performance of phosphorus in wastewater was remarkable, and the removal rate reached 86.3%. The recovery of aluminum can decrease the dosage of polymeric aluminum chloride （PAC） in the wastewater treatment plant and reduce its operating cost.
Last Update:
2023-11-01