Abstract
The single and combined effects of three heavy metal ions (Cu2+, Cd2+, Zn2+) on phosphorus recovery from the simulated phosphorus-rich supernatant in municipal wastewater plant by crystallization of hydroxyapatite (HAP) were investigated. And Visual MINTEQ (Ver3.2) was applied for auxiliary analysis. The results indicated that Cu2+, Cd2+ or Zn2+ could inhibit HAP crystallization for phosphorus removal, and Zn2+ showed the strongest inhibition effect which fitted Monod inhibition model equation with the inhibition constant of 178.0 mg·L−1. The HAP crystallization system could synergistical remove heavy metals, and the order of the removal rate was Cu2+>Cd2+>Zn2+. Joint addition of Cu2+, Cd2+ and Zn2+ could strengthen the inhibition of phosphorus removal and weaken the removal effect of single heavy metal ion. SEM observation showed that the dosing of Cu2+, Cd2+ and Zn2+ led to the loose surface of the products, while they had similar impacts on the morphology of the products. The simulation results of Visual MINTEQ confirmed that Cu2+, Cd2+ and Zn2+ inhibited phosphorus removal by grabbing crystal ions of HAP and formed precipitate with heavy metal impurity, and the order of the impurity content was Cu2+>Cd2+>Zn2+. These results can provide reference for the practical application of HAP crystallization method in phosphorus recovery in urban sewage.
| Translated title of the contribution | Effect of typical heavy metal ions on phosphorus recovery from wastewater by crystallization of hydroxyapatite |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 921-928 |
| Number of pages | 8 |
| Journal | Chinese Journal of Environmental Engineering |
| Volume | 15 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 26 Mar 2021 |
| Externally published | Yes |