Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 13, Pages 13048-13055Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1451-2
Keywords
Liquid digestate; Struvite precipitation; Microalgae; Gray relational analysis (GRA)
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Funding
- Fundamental Research Funds for Central Non-profit Scientific Institution [Y2016CG34]
- Sichuan Youth Science & Technology Foundation [2017JQ0047]
- Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences
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Liquid digestate (LD) is highly turbid and contains ammonium (NH4+-N), which negatively influences microalgal growth. Therefore, a method of reducing LD turbidity and NH4+-N content is proposed, using struvite precipitation. To obtain struvite precipitation supernatant with an ideal UV transmittance, NH4+-N concentration, and N/P ratio for microalgal growth, the effects of pH and the molar ratio of NH4+/Mg2+/PO43- were studied. Results show that the optimal NH4+/Mg2+/PO4 (3-) molar ratio was 1:1.5:1.5, with a pH value of 8.5, following NaOH addition. Gray relational analysis (GRA) was applied to obtain a relative gray scale for the evaluation of multiple outputs. Results show that Chlorella regularis FACHB-1068 was the optimal microalgae species to support growth in the struvite precipitation supernatant. Using struvite precipitation and treatment with cultured C. regularis FACHB-1068 for 7 days, the removal efficiencies of NH4+-N, PO43--P, and COD in LD were 96.52, 99.33, and 35.30%, respectively.
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