Recovery of nutrients from the liquid fraction of digestate: Use of enriched zeolite and biochar as nitrogen fertilizers

Nazlı Pelin Kocatürk-Schumacher, Kor Zwart, Sander Bruun, Lars Stoumann Jensen, Helle Sørensen, Lijbert Brussaard

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

The liquid fraction after liquid/solid separation of biogas digestate has a high potential as a fertilizer due to its high nutrient concentration. However, the direct application of digestate in agricultural fields results in practical problems due to its voluminous nature. One solution to this could be to concentrate nutrients onto sorbents such as biochar or zeolites, which can subsequently be used as a fertilizer. This study investigated the ability of biochar and zeolite ‘clinoptilolite' enriched with digestate nutrients to supply nitrogen (N) when used as a fertilizer. A pot experiment with ryegrass was conducted to test the effect of a nutrient-enriched biochar and clinoptilolite by determining plant biomass growth and N uptake. This included untreated biochar and clinoptilolite as controls and two levels of N application (15 and 45 mg N per pot) each at two initial loading ratios (low and high). Nutrient-enriched biochar and clinoptilolite increased plant biomass yield (up to 1.02 and 2.39 g per pot) and N uptake (up to 11.23 and 39.94 mg N per pot) compared to the untreated sorbents treatments. Initial loading ratio had a significant effect on plant biomass response and apparent N recovery (ANR) for enriched clinoptilolite, and lower initial loading ratio improved plant growth. In contrast to clinoptilolite, higher initial loading ratio resulted in higher ANR. In conclusion, our results reveal that N released from enriched clinoptilolite and biochar could be taken up by the plants, clinoptilolite performed more effectively than biochar, and initial loading ratio affected the performance of the sorbents when used as a fertilizer.

LanguageEnglish
Pages187-195
JournalJournal of Plant Nutrition and Soil Science
Volume182
Issue number2
Early online date21 Dec 2018
DOIs
Publication statusPublished - Apr 2019

Fingerprint

biochar
clinoptilolite
zeolite
nitrogen fertilizers
fertilizer
liquid
liquids
nutrient
nitrogen
nutrients
adsorbents
fertilizers
biomass
zeolites
uptake mechanisms
biogas
Lolium
nutrient content
concentrates
plant growth

Keywords

  • biogas digestate
  • clinoptilolite
  • double-pot technique
  • enriched sorbent
  • initial loading
  • slow release N fertilizer

Cite this

Kocatürk-Schumacher, Nazlı Pelin ; Zwart, Kor ; Bruun, Sander ; Jensen, Lars Stoumann ; Sørensen, Helle ; Brussaard, Lijbert. / Recovery of nutrients from the liquid fraction of digestate : Use of enriched zeolite and biochar as nitrogen fertilizers. In: Journal of Plant Nutrition and Soil Science. 2019 ; Vol. 182, No. 2. pp. 187-195.
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abstract = "The liquid fraction after liquid/solid separation of biogas digestate has a high potential as a fertilizer due to its high nutrient concentration. However, the direct application of digestate in agricultural fields results in practical problems due to its voluminous nature. One solution to this could be to concentrate nutrients onto sorbents such as biochar or zeolites, which can subsequently be used as a fertilizer. This study investigated the ability of biochar and zeolite ‘clinoptilolite' enriched with digestate nutrients to supply nitrogen (N) when used as a fertilizer. A pot experiment with ryegrass was conducted to test the effect of a nutrient-enriched biochar and clinoptilolite by determining plant biomass growth and N uptake. This included untreated biochar and clinoptilolite as controls and two levels of N application (15 and 45 mg N per pot) each at two initial loading ratios (low and high). Nutrient-enriched biochar and clinoptilolite increased plant biomass yield (up to 1.02 and 2.39 g per pot) and N uptake (up to 11.23 and 39.94 mg N per pot) compared to the untreated sorbents treatments. Initial loading ratio had a significant effect on plant biomass response and apparent N recovery (ANR) for enriched clinoptilolite, and lower initial loading ratio improved plant growth. In contrast to clinoptilolite, higher initial loading ratio resulted in higher ANR. In conclusion, our results reveal that N released from enriched clinoptilolite and biochar could be taken up by the plants, clinoptilolite performed more effectively than biochar, and initial loading ratio affected the performance of the sorbents when used as a fertilizer.",
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Recovery of nutrients from the liquid fraction of digestate : Use of enriched zeolite and biochar as nitrogen fertilizers. / Kocatürk-Schumacher, Nazlı Pelin; Zwart, Kor; Bruun, Sander; Jensen, Lars Stoumann; Sørensen, Helle; Brussaard, Lijbert.

In: Journal of Plant Nutrition and Soil Science, Vol. 182, No. 2, 04.2019, p. 187-195.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Recovery of nutrients from the liquid fraction of digestate

T2 - Journal of Plant Nutrition and Soil Science

AU - Kocatürk-Schumacher, Nazlı Pelin

AU - Zwart, Kor

AU - Bruun, Sander

AU - Jensen, Lars Stoumann

AU - Sørensen, Helle

AU - Brussaard, Lijbert

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KW - double-pot technique

KW - enriched sorbent

KW - initial loading

KW - slow release N fertilizer

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