Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 544, Issue -, Pages 774-781Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2015.11.172
Keywords
Ammonia stripping; Vacuum evaporation; Nitrogen; Phosphorus; Plant hormones
Categories
Funding
- National Key Technology Research and Development Program of China [2015BAD21B04, 2012BAD47B02, 2012BAD14B03]
- Beijing Science and Technology Program [Z151100001115010, D141100001214002]
- Ministry of Science and Technology of China [SQ2013ZOA000017]
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Anaerobic digestate has valuable potential as organic fertilizer or soil amendment, given that it typically contains high amounts of plant nutrients, such as nitrogen, phosphate and plant hormones. In this study, ammonia stripping and vacuum evaporation were tested to compare their technical feasibilities and their effects on plant nutrient properties in the liquid fraction of digestate. Results of the batch experiments showed that the nutrient characteristics of liquid digestate, including total ammonia nitrogen (TAN), soluble P, gibberellic acid (GA), indoleacetic acid (IAA) and abscisic acid (ABA), were strongly dependent on the initial pH in both ammonia stripping and vacuum evaporation processes. A low plant nutrient concentration (TAN 137 mg.L-1, soluble P 1.5 mg.L-1, GA(3)/ABA 0.04) in the liquid digestate was achieved in the ammonia stripping process with Ca(OH)(2) addition of 12 g.L-1, whereas a high nutrient concentration (TAN 2998 mg.L-1, soluble P 178.3 mg.L-1, IAA 60.9mg.L-1 and GA(3)/ABA 0.4) was achieved in vacuum evaporation at a pH level of 6. According to the results, both ammonia stripping and vacuum evaporation can be used as an alternative of nutrient recovery techniques, which should be chosen based on the potential different applications of liquid digestate (e.g., soaking seed, increasing plant tolerance, and nutrients transportation). (C) 2015 Elsevier B.V. All rights reserved.
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