Rapid start-up and humification of kitchen waste composting by an innovative biodrying-enhanced process

Xin, Liqing; Qin, Yong; Lou, Tianru; Xu, Xingkun; Wang, Haoshu; Mei, Qingqing; Wu, Weixiang

doi:10.1016/j.cej.2022.139459

Cited by 40 publications

(8 citation statements)

References 42 publications

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“…Concerning BBF1, the lower productions of biomass and tomato fruits observed with respect to FC were probably ascribable also to the low biological stability of bio-dried materials which exercised phytotoxicity activity, as indicated by the presence of plant phytotoxicity symptoms registered above all at the early stage of the trial (i.e. yellowish leaves, reduced growth) 43 . This could be expected, since bio-dried materials do not undergo a complete stabilization process (i.e.…”

Section: Resultsmentioning

confidence: 99%

Effects of the application of microbiologically activated bio-based fertilizers derived from manures on tomato plants and their rhizospheric communities

Clagnan,

Cucina,

De Nisi

et al. 2023

Sci Rep

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Bio-based fertilizers (BBFs) recovered from animal manure are promising products to optimise resources recovery and generate high agricultural yields. However, their fertilization value may be limited and it is necessary to enrich BBFs with microbial consortia to enhance their fertilization value. Three specific microbial consortia were developed according to the characteristics of three different BBFs produced from manure (bio-dried solid fraction, solid fraction of digestate and biochar) to enhance plant growth and product quality. A greenhouse pot experiment was carried out with tomato plants grown with microbiologically activated BBFs applied either as N-organic fertilizers or as an organic amendment. A next generation sequencing analysis was used to characterise the development of each rhizospheric community. All the activated BBFs gave enhanced tomato yields (fresh and dry weight) compared with the non-activated treatments and similar to, or higher than, chemical fertilization. Concerning the tomato fruits’ organoleptic quality, lycopene and carotenoids concentrations were improved by biological activation. Metagenomic analysis points at Trichoderma as the main driver of the positive effects, with the effects of added bacteria being negligible or limited at the early stages after fertilization. In the context of the circular economy, the activated BBFs could be used to replace synthetic fertilisers, reducing costs and environmental burdens and increasing production.

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Section: Resultsmentioning

confidence: 99%

Effects of the application of microbiologically activated bio-based fertilizers derived from manures on tomato plants and their rhizospheric communities

Clagnan,

Cucina,

De Nisi

et al. 2023

Sci Rep

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“…30 In this study, the short GI increase at the beginning of composting was possibly due to the formation of humus precursors (e.g., aromatic amino acids and quinone) to enhance biostability. 31 However, the digestate used in this study contained polyaluminum chloride after solid−liquid separation, thereby resulting in the gradual release of aluminum ions from organic biodegradation to inhibit seed germination on day 7. Yu et al 32 reported that cell walls of soybean cultivars ruptured significantly at the aluminum concentration of above 60 mg L −1 and thus inhibited the growth of dicotyledonous plants.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon was different from that reported previously as composting could effectively reduce the phytotoxicity of organic wastes to continuously increase the GI . In this study, the short GI increase at the beginning of composting was possibly due to the formation of humus precursors (e.g., aromatic amino acids and quinone) to enhance biostability . However, the digestate used in this study contained polyaluminum chloride after solid–liquid separation, thereby resulting in the gradual release of aluminum ions from organic biodegradation to inhibit seed germination on day 7.…”

Section: Resultsmentioning

confidence: 99%

Role of Lignocellulosic Biomass Composition to Regulate Microbial Mutualism for Organic Mineralization and Humification during Digestate Composting

Gao,

Xu,

Shi

et al. 2024

ACS EST Eng.

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This study investigated the performance of lignocellulosic wastes to regulate microbial interactions to improve the composting of digestate from the anaerobic digestion of food waste regarding organic mineralization and humification. Garden waste, rice husk, and cornstalks with diverse lignocellulosic biomass compositions and structures were representatively selected for comparison. High-throughput sequencing was integrated with a modular network analysis to decipher microbial community structures and their interactions. Results showed that mixing 15% of cornstalks and garden waste with digestate (wet weight) was more effective than rice husk to enrich functional microbes (e.g., Tepidimicrobium and Mortierella) to promote the microbial interkingdom for lignocellulosic degradation and humus formation. In particular, a stronger bacterial intrakingdom mutualism was observed with cornstalk addition to facilitate the progressive succession of bacteria in digestate from anaerobic to aerobic and thus inhibit the activities of anaerobic and denitrifying microbes to reduce the emissions of methane and nitrous oxide by 14.2−49.1%. Furthermore, garden waste with more lignin could effectively strengthen intrakingdom mutualism within fungi and their interkingdom interaction with bacteria to mitigate organic carbon mineralization and reduce carbon dioxide emission by 39.8−42.7%. By contrast, rice husk weakened microbial interkingdom mutualisms to retard organic biodegradation and humification during digestate composting. Results from this study provided fundamental understanding on selecting lignocellulosic wastes to regulate organic biotransformation and to improve humification and simultaneously mitigate gaseous emissions in digestate composting.

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“…The moisture content removal rate was highest for V600, followed by V300 of continuous aeration, suggesting that relatively higher aeration rate helped to bio-drying. When the aeration rate was greater than 900 L/h of continuous aeration, the moisture content removal rate was lower due to more heat loss ( Xin et al, 2023 ). As for intermittent aeration, the moisture content of K20T0 (V300), K15T5 (V400), K10T10 (V600), and K5T15 (V1200) decreased by 15.13, 10.16, 8.07, and 14.29%, respectively, after composting ( p < 0.01).…”

Section: Resultsmentioning

confidence: 99%

Effects of aeration modes and rates on nitrogen conversion and bacterial community in composting of dehydrated sludge and corn straw

Wang,

Xu,

Wang

et al. 2024

Front. Microbiol.

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Aeration is an important factor to regulate composting efficiency and nitrogen loss. This study is aimed to compare the effects of different aeration modes (continuous and intermittent) and aeration rate on nitrogen conversion and bacterial community in composting from dehydrated sludge and corn straw. Results showed that the intermittent aeration mode at same aeration volume was superior to the continuous aeration mode in terms of NH3 emission reduction, nitrogen conversion and germination index (GI) improvement. Intermittent aeration mode with 1200 L/h (aeration 5 min, stop 15 min) [K5T15 (V1200)] and 300 L/h of continuous aeration helped to the conservation of nitrogen fractions and accelerate the composting process. However, it was most advantageous to use 150 L/h of continuous aeration to reduce NH3 emission and ensure the effective composting process. The aeration mode K5T15 (V1200) showed the fastest temperature rise, the longer duration of thermophilic stage and the highest GI (95%) in composting. The cumulative NH3 emission of intermittent aeration mode was higher than continuous aeration mode. The cumulative NH3 emission of V300 was 23.1% lower than that of K5T15 (V1200). The dominant phyla in dehydrated sludge and corn straw composting were Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes. The dominant phylum in the thermophilic stage was Firmicutes (49.39%~63.13%), and the dominant genus was Thermobifida (18.62%~30.16%). The relative abundance of Firmicutes was greater in the intermittent aeration mode (63.13%) than that in the continuous aeration mode (57.62%), and Pseudomonas was dominant in composting with lower aeration rate and the lowest NH3 emission. This study suggested that adjustment to the aeration mode and rate could affect core bacteria to reduce the nitrogen loss and accelerate composting process.

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Rapid start-up and humification of kitchen waste composting by an innovative biodrying-enhanced process

Cited by 40 publications

References 42 publications

Effects of the application of microbiologically activated bio-based fertilizers derived from manures on tomato plants and their rhizospheric communities

Effects of the application of microbiologically activated bio-based fertilizers derived from manures on tomato plants and their rhizospheric communities

Role of Lignocellulosic Biomass Composition to Regulate Microbial Mutualism for Organic Mineralization and Humification during Digestate Composting

Effects of aeration modes and rates on nitrogen conversion and bacterial community in composting of dehydrated sludge and corn straw

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