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.
污水处理厂金属盐泥资源化回收及其吸附除磷性能
- Title:
- Adsorption Removal of Phosphate in Wastewater by Metal-containing Salt Sludge Recovered from WWTP
- Keywords:
- wastewater treatment plant; metal-containing salt sludge; phosphate removal; resource utilization
- 摘要:
- 从污水处理厂末端气浮池回收原始金属盐泥，考察了其对水中磷酸盐的吸附性能，以及吸附剂投加量、再生液pH等因素对吸附性能的影响。结果表明，当盐泥投加量为0.3 g/L时，其释放的磷酸盐浓度也仅为（0.04±0.01） mg/L，远低于城镇污水处理厂一级A排放标准，更远低于城镇污水处理厂一般进水浓度（4~7 mg/L）。随着原始盐泥投加量的增大，对水中磷酸盐的去除率提高。当盐泥投加量为0.5 g/L时，对浓度为1 mg/L的含磷溶液去除率高达89.4%，且吸附过程更符合准二级动力学（R2=0.99）。原始盐泥对生化池进水和气浮池进水中的磷酸盐（分别为2.32、0.52 mg/L）均具有良好的去除效果，去除率分别为（54.5±1.4）% 和（26.2±0.8）%，表现出优异的除磷应用潜力。再生液pH显著影响吸附性能，且再生后的金属盐泥（pH=10处理）对磷酸盐的吸附去除率达到87.0%，显著高于原始盐泥（79.6%）。
- 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.
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