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Enhanced Struvite Precipitation Efficiency from Rich Nitrogen and Phosphate Wastewater by Modified Powder Coffee Waste

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Abstract:

Mg-impregnated biochar was created by pyrolyzing powder coffee waste in order to recover nitrogen and phosphorus from pig wastewater. The drawback of biochar is its low-nutrient while struvite production is its high chemical cost. The experiment examined the effects of Mg concentrations (1M, 1.5M, and 3M) on the of modified powder coffee waste. The influence of Mg/N/P molar; pH was studied. A maximum of 96.5% of PO4 3- -P and 86.8% of NH4 +-N could be recovered by Mg-biochar at pH=9, Mg/P=1.2/1, and stirring in 30 minutes. Results of XRD and FT-IR showed that phosphate and nitrogen were recovered on Mg-PCW by covalent bonding, which promoted the production of struvite crystals. In terms of selectivity or specificity for struvite synthesis, Mg-biochar showed superior result to Mg chemical (non-biochar). N converted to struvite from the recovered or removed NH4 + in waste water is 50% and 75% with Mg-non biochar and Mg-biochar, respectively. This approach emphasizes the cost-effective synthesis of struvite and the advantages of CO2 sequestration in addition to waste recycling and pollution reduction.

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Periodical:

Engineering Headway (Volume 40)

Pages:

41-55

DOI:

https://doi.org/10.4028/p-u5jeI9

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Online since:

July 2026

Authors:

Tran Thi To Uyen, Tran Thi Minh Hang, Pham Vu Gia Huy, Nguyen Manh Khai*

Keywords:

Nitrogen, Phosphate, Powder Coffee Waste, Swine Wastewater

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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