Journal
RESOURCES CONSERVATION AND RECYCLING
Volume 185, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.resconrec.2022.106438
Keywords
Hydrothermal carbonization; Process water; Phosphate recovery; Vivianite crystallization
Categories
Funding
- Beijing Municipal Education Commis- sion through the Innovative Transdisciplinary Program ? [GJJXK210102]
- Ecological Restoration Engineering?
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This study investigated the impact of organic and inorganic impurities in process water of kitchen waste hydrothermal carbonization (HTC) on the crystallization of vivianite, and explored approaches to reduce their negative effects.
Crystallization of vivianite is a sustainable way to recover phosphate from process water of kitchen waste hydrothermal carbonization (HTC). This study investigated impact of organic and inorganic impurities in HTC process water on vivianite crystallization and approaches to reduce their negative impact. Results showed that acetate, bovine serum albumin and humic acid reduced the phosphate removal and inhibited the vivianite crystallization. Ca and Mg triggered competing precipitations and reduced the vivianite purity while carbonate reduced the phosphate removal and the vivianite purity. In addition, negative effects of furfural and suspended solids on vivianite crystallization could be ignored. Increasing Fe(II)/P ratio rather than increasing pH minimized the negative effects of impurities on vivianite crystallization in real process water. The phosphate removal reached 98.2% when the Fe(II)/P ratio increased to 2 at pH 6. Therefore, it is technical-feasible to recover phosphate from HTC process water through vivianite crystallization.
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