A novel Fe(II)-Ca synergistic phosphorus removal process: process optimization and phosphorus recovery

作者：Qiu, Lin; Zhang, Meng; Yu, Xiaoqing; Zheng, Ping^*

来源：Environmental Science and Pollution Research, 2018, 25(2): 1543-1550.

DOI：10.1007/s11356-017-0183-z

• Wastewater treatment
• Phosphorus removal
• High phosphorus-containing wastewater
• Ferrous-calcium complex
• Process optimization
• Phosphorus recovery

Phosphorus removal from wastewater is an important means to control eutrophication and to recover phosphorus from wastewater. In this study, a novel Fe(II)-Ca synergistic phosphorus removal process is developed using the complex of ferrous and calcium salts. The results showed that ferrous and calcium had an antagonistic effect at Fe(II)/Ca molar ratio of lower than 1:4, but a synergistic effect at Fe(II)/Ca molar ratio of higher than 1:4, with the strongest synergistic effect at Fe(II)/Ca molar ratio of 7:3. The optimal parameters of this novel process were as follows: Fe(II)/Ca = 3:1, ferrous-calcium complex/phosphorous (M/P) >= 1.5:1, pH = 7.0-8.0, and fast mixing speed (FMS) = 100-150 rpm. The cost of phosphorus removal agents was US$1.024 (kg P)(-1), reduced by 30.39% compared with that of the traditional phosphorus removal process. The phosphorus content (by P2O5) in the precipitate produced in the new process was 32.70%, which had a high recycling value.

• 出版日期2018-1
• 单位浙江大学