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Nutrient Reduction of Dairy Manure Through Solid-Liquid Separation with Flocculation and Subsequent Microalgal Treatment

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Abstract

High concentrations of dairy operations in Southern Idaho have brought up big challenges for proper manure management to alleviate the eutrophication stress. In order to explore more technologies confronting the high nutrient load in dairy manure, a sequential process combining enhanced solid-liquid separation through flocculation-centrifuge and the subsequent microalgal growth in the liquid part was studied in this study. Solid-liquid separation by flocculation-centrifuge process, using a natural flocculant chitosan and a flocculation aid kaolin, was optimized through response surface methodology (RSM) technique using central composite design (CCD) method. Under the optimal flocculation-centrifuge pretreatment, i.e., the maximal total suspended solid (turbidity) removal group, turbidity, COD, TKN, and TP have been removed by 92.7%, 72.6%, 58.7%, and 43.0%, respectively. Applying 2-fold dilution, the supernatant from this treatment was further used for microalgae Chlorella vulgaris cultivation. COD, TKN, and TP were further reduced by 82.2%, 90.1%, and 83.4%, respectively. Turbidity was largely removed from the original dairy manure, providing a relatively clear solution that became suitable for photo-mixotrophic culture of microalgae.

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Funding

This study is supported by the USDA National Institute of Food and Agriculture (NIFA), Western Sustainable Agriculture Research and Education project-SW18-015, and USDA NIFA multi-state hatch project S-1074.

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Authors and Affiliations

  1. Department of Soil and Water Systems, Twin Falls Research & Extension Center, University of Idaho, 315 Falls Ave, Twin Falls, ID, 83301, USA

    Liang Wang & Lide Chen

  2. Department of Biological Engineering, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844, USA

    Sarah (Xiao) Wu

Authors
  1. Liang Wang
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  2. Lide Chen
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  3. Sarah (Xiao) Wu
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Correspondence to Lide Chen.

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Wang, L., Chen, L. & Wu, S.(. Nutrient Reduction of Dairy Manure Through Solid-Liquid Separation with Flocculation and Subsequent Microalgal Treatment. Appl Biochem Biotechnol 190, 1425–1437 (2020). https://doi.org/10.1007/s12010-019-03185-w

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  • DOI: https://doi.org/10.1007/s12010-019-03185-w

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