Effect of flocculation pre-treatment on membrane nutrient recovery of digested chicken slurry: Mitigating suspended solids and retaining nutrients

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  • Hongzhen Luo, China Agricultural University, Beijing, Ghent University
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  • Tao Lyu, Nottingham Trent Univ, Nottingham Trent University, Sch Anim Rural & Environm Sci
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  • Atif Muhmood, China Agr Univ, China Agricultural University, Coll Engn, Minist Agr, Key Lab Clean Utilizat Technol Renewable Energy
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  • Yong Xue, China Agr Univ, China Agricultural University, Coll Engn, Minist Agr, Key Lab Clean Utilizat Technol Renewable Energy
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  • Haotian Wu, China Agr Univ, China Agricultural University, Coll Engn, Minist Agr, Key Lab Clean Utilizat Technol Renewable Energy
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  • Erik Meers, Univ Ghent, Ghent University, Fac Biosci Engn, Dept Green Chem & Technol, Isotope Biosci Lab ISOFYS
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  • Renjie Dong, China Agr Univ, China Agricultural University, Coll Engn, Minist Agr, Key Lab Clean Utilizat Technol Renewable Energy
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  • Shubiao Wu

Use of membrane filtration is attracting increasing attention for nutrient recovery from anaerobically digested slurry. However, the challenge is to reduce membrane fouling by effective solids mitigation, while maintaining valuable nutrients. In this study, the effects of several flocculation pre-treatments using polyaluminium chloride, iron chloride, and flocculant aid at various dosages were investigated. The results showed significant improvement in membrane flux from 0.8 to 27.6 mL/m 2/s due to solid migration (up to 75% removal). Significant loss of PO 4 3−-P (99%) and humic acids (40–80%) was observed. However, the content of NH 4 +-N and indoleacetic acids was largely maintained in the treated slurry. Moreover, toxic metals were significantly removed through flocculation, making the final product risk-free of heavy metals for agricultural application.

Original languageEnglish
JournalChemical Engineering Journal
Volume352
Pages (from-to)855-862
Number of pages8
ISSN1385-8947
DOIs
Publication statusPublished - 15 Nov 2018

    Research areas

  • Anaerobic digestion, Membrane filtration, Flocculation pre-treatment, Heavy metals, Organic fertilizer, ANAEROBIC-DIGESTION, CHARGE NEUTRALIZATION, PRE-COAGULATION, WATER-TREATMENT, WASTE-WATER, PHOSPHORUS, PRODUCTS, REMOVAL, ACID, PRECIPITATION

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