FEIRong-xin,XIANGLi,HUANGChou,et al.Adsorption Removal of Phosphate in Wastewater by Metal-containing Salt Sludge Recovered from WWTP[J].China Water & Wastewater,2022,38(23):1-6.
Adsorption Removal of Phosphate in Wastewater by Metal-containing Salt Sludge Recovered from WWTP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第23期
Page:
1-6
Column:
Date of publication:
2022-12-01
- Keywords:
- wastewater treatment plant; metal-containing salt sludge; phosphate removal; resource utilization
- Abstract:
- This paper discussed the phosphate removal ability of the original metal-containing salt sludge recovered from the flotation tank of the wastewater treatment plant (WWTP), and further investigated the effects of the adsorbent dosage, the regeneration solution pH and other factors on the adsorption performance. When the dosage of salt sludge was set as 0.3 g/L, the phosphate released by the adsorbent was also only (0.04±0.01) mg/L, which was much lower than grade Ⅰ-A discharge standard of pollutants for municipal wastewater treatment plant and concentration of influent from WWTP (4-7 mg/L). With the increase of the original salt sludge dosage, the P-removal rate was also improved. When the dosage of salt sludge was set as 0.5 g/L, the removal rate of P-containing solution (1 mg/L) was as high as 89.4%, and the phosphate adsorption process by salt sludge could better be described by pseudo-second-order kinetics model (R2=0.99). The raw salt sludge had a good phosphate removal efficiency of (54.5±1.4)% and (26.2±0.8)% on the influent of biochemical tank (2.32 mg/L) and floatation tank (0.52 mg/L), exhibiting an excellent practical application potential for phosphate removal of real wastewater. The pH of regeneration solution significantly affected the adsorption performance，and when the pH was adjusted as 10, the phosphate adsorption efficiency of the regenerated salt sludge reached 87.0%, much higher than 79.6% of the raw salt sludge.
Last Update:
2022-12-01