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Biogas Digestate in Vegetable Hydroponic Production: pH Dynamics and pH Management by Controlled Nitrification

Pelayo Lind, Olle and Hultberg, Malin and Bergstrand, Karl-Johan and Larsson Jönsson, Helene and Caspersen, Siri and Asp, Håkan (2021). Biogas Digestate in Vegetable Hydroponic Production: pH Dynamics and pH Management by Controlled Nitrification. Waste and Biomass Valorization. 12 , 123-133
[Research article]

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Abstract

Soilless cultivation of vegetables with digestate fertilizer from biogas production as a nutrient source is a promising method for integrating food production and organic waste management. In this study, bok choy (Brassica rapa var. chinensis) was cultivated in a hydroponic nutrient film technique system with biogas digestate as the only fertilizer source. Nitrification in moving bed biofilm reactors (external and/or integrated into the hydroponic cultivation system) was employed to lower the high ammonium concentration in the digestate prior to use. Treatments with differing nitrification and digestate input strategies were compared with respect to pH dynamics, crop growth, shoot water content, and shoot mineral content. The results showed that < 20% longer cultivation time (< 1 week) gave similar yield in biogas digestate-based hydroponics as in conventional hydroponics based on synthetic fertilizers. Automatic pH control through addition of digestate resulted in similar shoot dry weight as in the mineral fertilizer reference system. It can be concluded that biogas digestate is a suitable plant nutrient source for hydroponic production of bok choy, considering productivity and circularity aspects. The combined impact of digestate ammonium content, digestate pH, and the nitrification step needs to be considered when designing a hydroponic system with biogas digestate as the fertilizer source. Graphic

Authors/Creators:Pelayo Lind, Olle and Hultberg, Malin and Bergstrand, Karl-Johan and Larsson Jönsson, Helene and Caspersen, Siri and Asp, Håkan
Title:Biogas Digestate in Vegetable Hydroponic Production: pH Dynamics and pH Management by Controlled Nitrification
Series Name/Journal:Waste and Biomass Valorization
Year of publishing :2021
Volume:12
Page range:123-133
Number of Pages:11
Associated Programs and Other Stakeholders:Z - SLU - Libray > Odla mera
ISSN:1877-2641
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Horticulture
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Renewable Bioenergy Research
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:Anaerobic digestate, Biogas production, Biofertilizer, Circular economy, Organic hydroponics
URN:NBN:urn:nbn:se:slu:epsilon-p-104523
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-104523
Additional ID:
Type of IDID
DOI10.1007/s12649-020-00965-y
Web of Science (WoS)000520079300001
ID Code:22140
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Biosystems and Technology (from 130101)
Deposited By: SLUpub Connector
Deposited On:08 Feb 2021 09:23
Metadata Last Modified:09 Feb 2021 05:00

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