Pilot-scale demonstration of nitrogen recovery in the form of ammonium phosphate (AP) from anaerobic digestate
- Authors
- Dong, Dandan; Choi, Oh Kyung; Lee, Kwanhyoung; Lee, Jae Woo
- Issue Date
- 2월-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Nitrogen recovery; Mono-ammonium phosphate (MAP); Fertilizer; Crystallization; Anaerobic digestate
- Citation
- BIORESOURCE TECHNOLOGY, v.297
- Indexed
- SCIE
SCOPUS
- Journal Title
- BIORESOURCE TECHNOLOGY
- Volume
- 297
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57828
- DOI
- 10.1016/j.biortech.2019.122392
- ISSN
- 0960-8524
- Abstract
- Nitrogen in anaerobic digestate was recovered as ammonium phosphates (APs), a valuable fertilizer, in a pilotscale system consisting of ammonia stripper, absorber and crystallizer. The dissolved ammonium concentration in the anaerobic digestate was stripped and then absorbed into the phosphoric acid (42.5 wt%) with 95% absorbing efficiency. As the NH3 stripping continued, both the N/P ratio and pH, key operating parameters in the absorber are optimized N/P = 0.6 and pH = 1.7. The residual AP solution after crystallization was reused to enhance the crystallization efficiency up to 88%. The overall recovery efficiency of APs was estimated at 72% of the input nitrogen mass. Analyses of SEM and XRD revealed that the recovered AP crystals were mainly composed of mono-ammonium phosphate (MAP). This pilot-scale study demonstrated that nitrogen load in anaerobic digestates could be effectively recovered as a valuable fertilizer source of AP crystals.
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Collections - Graduate School > Department of Environmental Engineering > 1. Journal Articles
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