Effects of heavy metals on calcium phosphate precipitation and recovery and their deposition behaviors

QIU Linqing; CHEN Yuning; HU Zekun; WEI Chaohai; QIU Guanglei

doi:10.13205/j.hjgc.202503006

Volume 43 Issue 3

Mar. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(3): 70-76

QIU Linqing, CHEN Yuning, HU Zekun, WEI Chaohai, QIU Guanglei. Effects of heavy metals on calcium phosphate precipitation and recovery and their deposition behaviors[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(3): 70-76. doi: 10.13205/j.hjgc.202503006

Citation:

QIU Linqing, CHEN Yuning, HU Zekun, WEI Chaohai, QIU Guanglei. Effects of heavy metals on calcium phosphate precipitation and recovery and their deposition behaviors[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(3): 70-76. doi: 10.13205/j.hjgc.202503006

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Effects of heavy metals on calcium phosphate precipitation and recovery and their deposition behaviors

doi: 10.13205/j.hjgc.202503006

1. Dongguan Water Group Water Purification Co., Ltd., Dongguan 523000, China;
2. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;
3. Department of Chemistry, National University of Singapore, Singapore 118425, Singapore

Received Date: 2024-09-30
Accepted Date: 2025-02-18
Rev Recd Date: 2025-02-09

Available Online: 2025-06-07

Publish Date: 2025-03-01

Abstract

Abstract

Calcium phosphate precipitation is a promising phosphate recovery process from wastewater. In this work， the effects of heavy metals （i.e.， Cd（Ⅱ）， Pb（Ⅱ）， and Cr（Ⅵ）， with a concentration range of 50 to 2000 μg/L） on calcium phosphate precipitation were investigated under different pH conditions， together with the analyses of their co-precipitation behaviors and the subsequent impacts on the quality of the recovery products. Results showed that the presence of heavy metals did not affect the removal and recovery of phosphate. Whereas， coexisting heavy metals did lead to slight reductions in Ca²⁺ consumption， ranging from 0.61% to 6.26%. Notably， Cr（Ⅵ） ions hydrolyzed to lower the solution pH and combined with Ca²⁺ to form CaCrO₄-like substances， thus inhibiting the precipitation of calcium phosphate and/or hydroxyapatite. Based on X-ray Diffraction （XRD）， in Ca²⁺-Pb²⁺ or Ca²⁺-Cd²⁺ binary systems， the recovery products contained cadmium phosphate or lead phosphate， reducing the purity of the phosphorus recovery products and affecting their subsequent utilization. This work provides novel insights into the recovery processes of phosphate with the coexistence of heavy metals， revealing the effects and mechanisms of heavy metals on calcium phosphate precipitation and the recovery products.
- phosphorus recovery,
- calcium phosphate,
- heavy metal,
- deposition behaviors,
- co-precipitation,
- wastewater treatment

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References(19)

References

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