Effect of drying, composting and subsequent impurity removal by sieving on the properties of digestates from municipal organic waste

Knoop, Christine; Dornack, Christina; Raab, Thomas

doi:10.1016/j.wasman.2017.11.022

Cited by 26 publications

(9 citation statements)

References 39 publications

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“…D1 did not report an excess of Zn since the organic compounds produced in single-stage reactors generate low metal accumulation rates [37]. Nevertheless, although regulations regarding this metal are usually based on total concentrations, its ecotoxicity depends not only on total concentrations but also on its speciation.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical, microbiological characterization and phytotoxicity of digestates produced on single-stage and two-stage anaerobic digestion of food waste

Parra-Orobio

Rotavisky-Sinisterra

Pérez-Vidal

et al. 2021

Sustain Environ Res

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Organic amendments favor the development of sustainable agriculture by using less chemical fertilizers. In this way, the use of digestates from anaerobic digestion as soil conditioners in agriculture has been gaining interest due to their important N and P nutrient contents, among others. This study evaluated the potential use of digestates from anaerobic reactors treating food waste in single (D1) and two-stages (D2: hydrolytic/acidogenic and D3: acetogenic/methanogenic) configurations. Digestate characteristics and their potential application conditions (100, 50, 25, and 5%) were evaluated using Raphanus sativus as an indicator species. D3 reported the best performance in terms of: (i) better physicochemical, microbiological, and parasitological characteristics, being a class B material, without exceeding the established limits for heavy metals, fecal coliforms (FC < 1000 CFU 100 mL− 1), Salmonella spp. (0 CFU g− 1), and viable helminth eggs (0 HE g− 1); (ii) better stability indicators on D3, followed by D1 (volatile solids/total solids (VS/TS): 0.57 and 0.65, pH: 8.63 and 6.80, respectively), while D2 was the most unstable digestate (VS/TS > 0.87 and acidic pH); and (iii) greater potential for agricultural use, since a 5% dose produced a germination index > 120%, whose effect is associated with the presence of humic and fulvic acids and with N and P concentrations > 1%. In addition, the study reported that volatile fatty acids > 2500 mg L− 1 act as antimicrobial agents, reducing the required pathogen removal pretreatments.

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Section: Resultsmentioning

confidence: 99%

Physicochemical, microbiological characterization and phytotoxicity of digestates produced on single-stage and two-stage anaerobic digestion of food waste

Parra-Orobio

Rotavisky-Sinisterra

Pérez-Vidal

et al. 2021

Sustain Environ Res

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“…Results of the extraction with deionized water show that plant‐available nutrients and carbon are significantly higher from dried digestates (D2 air /D2 oven ) than from composted digestates (D1 comp /D2 comp ). The reason for this effect can be seen in the degradation rate of organic compounds contained in the digestate (Knoop et al, , ). Whereas drying conserves the digestate in its current state, composting results in further OM degradation and an increase of OM stability (Knoop et al, ).…”

Section: Discussionmentioning

confidence: 99%

Effect of the post treatments for biowaste‐based digestates on water solubility of nutrients and iron‐cyanide (Fe‐CN) complex mobility

2019

Self Cite

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With recent policy developments, an increase in organic waste utilization is expected. However, the use of organic amendments to reduce the mobility of iron‐cyanide (Fe‐CN) complexes and simultaneously promote vegetation growth has not been studied before. Therefore, we evaluated the effect of (a) drying, (b) composting, and (c) pelletizing on the ability of digestates (biowastes from an anaerobic treatment of municipal organic waste) to provide easily available nutrients and stabilize Fe‐CN complexes. Extraction with deionized water resulted in a considerably higher nutrient and carbon elution from air‐dried and oven‐dried digestates (50% dry matter [DM] of total K, 11% DM Mg, 7% DM Ca, and 6% DM C). Mixer‐pelletized digestates stand out among the composted samples (42% of total K, 3% DM C, 5% DM P, 1.5% DM Mg, and 1% DM Ca). The adsorption experiment showed the highest significant tot. CN conc. reduction using noncomposted, air‐dried (100%), and oven‐dried (82%) digestates. Significant correlations have been found for Mg, Ca, and dissolved organic carbon elution and slightly acidic pH as well as CN adsorption. The Fourier transform infrared analysis revealed Fe‐CN complexation on inorganic (K2Mn[FeII (CN)6] and NH4Fe[FeII (CN)6]) and organic constituents indicating formation of nitriles. Air‐ and oven‐dried digestates showed the most promising results in terms of nutrients' availability and ability to decrease Fe‐CN complex mobility.

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“…Ammonia will volatilize during drying, and some filters or stripping can be used to trap the nitrogen. It is usually believed that drying does little to change the plant availability of the nutrients, but there is little research on this [77].…”

Section: Treatment Options To Increase the Fraction Of Nutrients That Are Recycledmentioning

confidence: 99%

Nutrients Recovered from Organic Residues as Fertilizers: Challenges to Management and Research Methods

Foereid

2019

WJASS

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Organic waste as fertilizersMany organic waste streams have high nutrient content.Recent years have seen increasing restriction on release of such waste to the environment, due to risk of eutrophication and other environmental problems [1][2][3][4]. However, current management usually only considers this aspect, and not the recycling of nutrients as resources to replace mineral fertilizers. Production of mineral fertilizers is energy intensive, particularly fixation of nitrogen [5,6] and mine mineral resources in a way that is not sustainable in the long run. Particularly phosphorus that is estimated to run out in the next few centuries [7,8]. Potassium is also only mined in Europe and Canada, making it difficult for developing countries to get it at affordable prices [9]. It is therefore necessary to develop better systems to recycle nutrients in organic waste streams beck to agriculture to replace mineral fertilizers. There are a number of obstacles to this and needs for both research and societal changes [10,11].Fertilizers based on organic residues are known under many names, e.g. organic fertilizers, biofertilizers. The term "organic fertilizers can be misinterpreted to mean "fertilizers for organic agriculture", and although organic agriculture may be the most important user (see below) the goal has to be that fertilizers based on organic rest products should be used also outside organic agriculture. Further, current regulations prohibit the use of certain organic rest products (e.g. sewage) in organic agriculture. The term "organic" also excludes ash and precipitates, so "organically based" will be a better term, but maybe too long. However, in this paper I will use the term biofertilizer. It is meant to cover all fertilizers and products used as fertilizers and soil improver of organic origin. Types of BiofertilizersBiofertilizers can be categorized based on substrate/origin or treatment method or both. The main sources of biofertilizers are residues from agriculture, forestry, fishery/aquaculture and food processing, sewage and municipal waste. Treatment options

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Effect of drying, composting and subsequent impurity removal by sieving on the properties of digestates from municipal organic waste

Cited by 26 publications

References 39 publications

Physicochemical, microbiological characterization and phytotoxicity of digestates produced on single-stage and two-stage anaerobic digestion of food waste

Physicochemical, microbiological characterization and phytotoxicity of digestates produced on single-stage and two-stage anaerobic digestion of food waste

Effect of the post treatments for biowaste‐based digestates on water solubility of nutrients and iron‐cyanide (Fe‐CN) complex mobility

Nutrients Recovered from Organic Residues as Fertilizers: Challenges to Management and Research Methods

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