Organic matter affects phosphorus recovery during vivianite crystallization
1Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China E-mail: yqsheng@yic.ac.cn; University of Chinese Academy of Sciences, Beijing, China.
Summary
Organic matter in wastewater impacts phosphorus recovery using vivianite crystallization. Humic acid and sodium alginate significantly reduced phosphorus recovery efficiency and altered crystal size.
Area of Science:
- Environmental Chemistry
- Materials Science
Background:
- Phosphorus (P) recovery from wastewater is crucial for resource management and environmental protection.
- Vivianite crystallization is an emerging technology for P recovery, but its efficiency can be affected by wastewater composition.
- Organic matter (OM) is a common component in wastewater that may interfere with vivianite formation.
Purpose of the Study:
- To investigate the effects of different types of organic matter (glucose, bovine serum albumin (BSA), humic acid (HA), and sodium alginate (SA)) on phosphorus recovery via vivianite crystallization.
- To understand the mechanisms by which OM influences vivianite formation and P recovery efficiency.
Main Methods:
- Experiments were conducted to assess P recovery efficiency in the presence of varying concentrations of four representative OMs.
- Vivianite crystal morphology and particle size were analyzed.
- Mechanistic studies focused on the complexation between OM and Fe2+ and its effect on zeta potential and nucleation.
Main Results:
- Humic acid (HA) and sodium alginate (SA) significantly inhibited P recovery efficiency.
- BSA, HA, and SA altered the aggregated form and reduced the particle size of vivianite crystals.
- Complexation between OM and Fe2+ was identified as a primary reason for reduced P recovery, while HA/SA affected zeta potential and BSA/SA influenced nucleation sites.
Conclusions:
- The presence of certain organic matters, particularly HA and SA, negatively impacts phosphorus recovery through vivianite crystallization.
- Understanding these interactions is key to optimizing vivianite-based P recovery systems for complex wastewater streams.
- Further research can focus on mitigating the inhibitory effects of OM for enhanced phosphorus recovery.
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