Use of digestate from a decentralized on-farm biogas plant as fertilizer in soils: An ecotoxicological study for future indicators in risk and life cycle assessment

Pivato, Alberto; Vanin, Stefano; Raga, Roberto; Lavagnolo, Maria Cristina; Barausse, Alberto; Rieple, Antonia; Laurent, Alexis; Cossu, Raffaello

doi:10.1016/j.wasman.2015.12.009

Cited by 110 publications

(56 citation statements)

References 41 publications

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“…Such results are in accordance with those reported by other authors ( Alburquerque et al, ; Pivato et al, ; Stefaniuk et al, ; Tigini et al, ), who also observed that as a general trend, the application of low concentrations of AD acted as a stimulant giving higher values of GI and stimulating seedling growth. Such an improvement in germination could be related not only to the nutrients provided by the digestate solutions, but also to a phytohormone‐like effect ( Emino and Warman , ; Moldes et al, ).…”

Section: Resultssupporting

confidence: 93%

“…Compared with other AD, which were also tested at a broad range of dilutions, the AD from FVW in the present work showed a high stimulant effect, as we observed GI values from 146% to 341% for AD‐m and from 155% to 409% for AD‐m‐ST (Tab. ), while Pivato et al () observed maximum GI values of nearly 140%, and Alburquerque et al () a maximum GI of 150% in the standardized tests of phytotoxicity. The AD from this work showed a low EC, a neutral pH, and a low

{N - NH}_{4}^{+}

(Tab.…”

Section: Resultsmentioning

confidence: 92%

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Innovative liquid formulation of digestates for producing a biofertilizer based on Bacillus siamensis: Field testing on sweet pepper

Pastor-Bueis

Mulas

Gómez

et al. 2017

J. Plant Nutr. Soil Sci.

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A biofertilizer (BF) based on the plant growth promoting rhizobacterium (PGPR) Bacillus siamensis was produced using anaerobic digestate (AD) as the main ingredient of the growth medium, alongside a carbon source from residual origin. The use of residues for the growth of PGPR reduces the production costs of biofertilizers, but makes an assessment of the possible toxicity of residues for the bacteria or plants necessary. Therefore, the growth medium of PGPR was first optimized using the response surface methodology (RSM), followed by phytotoxicity tests and a field trial of the BF in a sweet pepper (Capsicum annuum L.) crop at two different locations. AD at 50% dilution, supplemented with 2.3% sugar beet molasses, was the optimum growth medium for producing the BF, with a bacterial concentration of 109 cfu mL−1. In the field trial, the treatments inoculated with BF and fertilized with decreased mineral N (80%) produced significantly better yields per ha than the controls with decreased N (80%) and full N (100%) without BF. This indicates improved efficiency of N use by the crop, as a consequence of the use of BF.

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Section: Resultssupporting

confidence: 93%

{N - NH}_{4}^{+}

(Tab.…”

Section: Resultsmentioning

confidence: 92%

Innovative liquid formulation of digestates for producing a biofertilizer based on Bacillus siamensis: Field testing on sweet pepper

Pastor-Bueis

Mulas

Gómez

et al. 2017

J. Plant Nutr. Soil Sci.

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show abstract

“…Actually, some studies were performed in vivo (Różyło et al, 2015), other applied different exposition periods (Alvarenga et al, 2015) or other kinds of digestate (Massaccesi et al, 2013). In a most recent study, the use of proper concentrations of digestate as a biofertiliser is encouraged, since it causes biostimulation under 20% dose (Pivato et al, 2015).…”

Section: Fischerimentioning

confidence: 99%

Is digestate safe? A study on its ecotoxicity and environmental risk on a pig manure

Tigini

Franchino

Bona

et al. 2016

Science of The Total Environment

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Abstract. Digestate represents a precious by-product in particular in agriculture, however its impact on the environment and human health is still unexplored. In this work, the toxicity of a pig slurry digestate was assessed through 7 ecotoxicity tests and considering 10 different endpoints. Besides, a synthetic index was applied to the outputs of the battery of tests for the environmental risk assessment, in order to evaluate the opportunity to use directly this kind of digestate in agriculture or to introduce an additional treatment. All the organisms were sensitive to digestate toxicity (EC 50 ranged from 14.22% for Cucumis sativum to 0.77% for Raphidocelis subcapitata). The physical-chemical features at the base of this toxicity seem to be the high content of ammonium, salinity, COD, phosphate and colour. The synthetic index showed that the digestate was very toxic and associated to an extremely high environmental risk. Thus a pre-treatment is needed to reduce its toxicity and environmental impact, whatever could 2 be its exploitation.

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“…The fact, that there is only limited scientific literature on the ecotoxicity of digestate and, moreover, the fact, that available data represent predominantly only acute bioassays signalises the potential gaps of knowledge in this field. Currently probably the only chronic ecotoxicity data for digestate were published by Pivato et al (2016) from the experiments on the earthworm Eisenia foetida. In this recent study the matrix-based approach is used with conclusion, that the direct-contact bioassays bring more realistic results.…”

Section: : Effect Of Fugate and Digestate On Photosynthetic Activitymentioning

confidence: 99%

Digestate and Fugate - Fertilizers with Ecotoxicological Risks

Jančula¹,

Zezulka²,

Došek³

et al. 2017

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Increasing number of decentralised biogas plants increases not only the amount of biogas produced, but also the production of digestate. Digestate and fugate are believed to be good fertilizers. However, there is often a tradeoff between other environmental impacts linked to agricultural production like eutrophication or ecotoxicity. Only limited ecotoxicological information is known about the effects of digestate or fugate on terrestrial fauna and flora. This is the first study comparing the survival and reproduction of collembolans as the representative soil fauna and the root growth and photosynthetic activity of Sinapis alba and Panicum miliaceum plants when exposed to digestate and fugate. Comparison of ecotoxicological results with chemical analysis of both digestate and fugate has led to the conclusions that application of digestate and fugate was beneficial neither for tested plants, nor for zooedaphon. Under practically used dosing both digestate and fugate can represent potential ecotoxicological problems, which can affect zooedaphon diversity and reproduction resulting in degradation of soil structure, reduction of microbial activity or water retention capacity of treated soils. That is why we do recommend at least simplified ecotoxicological testing of digestate as presented in this study. Ecotoxicity testing can support decision of direct application on soil, or mixing the digestate with other materials (like compost, manure, pond sediments, or biochar), what will help to utilize nutrients and consequently can prevent degradation of soil fertility.

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Use of digestate from a decentralized on-farm biogas plant as fertilizer in soils: An ecotoxicological study for future indicators in risk and life cycle assessment

Cited by 110 publications

References 41 publications

Innovative liquid formulation of digestates for producing a biofertilizer based on Bacillus siamensis: Field testing on sweet pepper

Innovative liquid formulation of digestates for producing a biofertilizer based on Bacillus siamensis: Field testing on sweet pepper

Is digestate safe? A study on its ecotoxicity and environmental risk on a pig manure

Digestate and Fugate - Fertilizers with Ecotoxicological Risks

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