Effects of woody biochar on dry thermophilic anaerobic digestion of organic fraction of municipal solid waste

Bona, D.; Beggio, Giovanni; Weil, Tobias; Scholz, Matthias; Bertolini, Sara; Grandi, Luca; Baratieri, Marco; Schievano, Andrea; Silvestri, Silvia; Pivato, Alberto

doi:10.1016/j.jenvman.2020.110633

Cited by 29 publications

(16 citation statements)

References 60 publications

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“…For the 5% doses, the RSG values ranged between 70 and 95%, similar to those by Bona et al [44], who concluded that as diluted digestate doses decrease, germination increases. This is attributed to an increase in organic carbon availability as organic carbon exhibits a tendency to form compounds with potential contaminants, thus reducing the effects from any phytotoxic substances found in digestates.…”

Section: Digestate Maturitysupporting

confidence: 87%

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: Digestate Maturitysupporting

confidence: 87%

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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“…Remarkably, dose-response curves of treated eluates were not characterized by the typical bio-stimulation behavior characterizing digestates at the lower dilutions [29]. Besides possible aluminum direct phytotoxicity, also high level of TAN and salinity characterizing digested residues, could be the main cause of acute phytotoxicity (i.e., inhibition of seed germination and root elongation) [28,29,54,55]. In this context, because of the lower leachable (i.e., bioavailable) concentration of HMs, higher phytotoxicity of treated solid fractions seems to be more correlated with increased salinity of tested eluates, indirectly determined by the soluble Al and Cl − concentrations, resulting from the application of tested products.…”

Section: Fertilizing Potential Leachability Of Hms and Phytotoxicity Of Treated Solid Fractionsmentioning

confidence: 95%

“…At the end of incubation period, the shooting seedlings from each replicate were removed from the Petri dish and their length was measured to derive dilution specific Germination Index (GI). Median effect concentrations (EC50) were determined through logistic and linear-logistic regression: the best fitting model was used according to the standard deviation of the distances between fitted and measured data [28].…”

Section: Phytotoxicity Testingmentioning

confidence: 99%

“…Also, non-regulated chemical-physical properties and environmental behavior of treated solids (e.g., possible increased phytotoxicity due to residual byproducts of used chemicals) must be assessed to support scientifically sound decisions on sustainable agricultural reuse or safe disposal of fractions from CES. In this context, the integrated approach between leaching test and phytotoxicity testing was efficiently used to understand the overall environmental quality of treated digested residues [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Beggio

Peng

Lü

et al. 2021

Waste Biomass Valor

Self Cite

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Chemically enhanced solid–liquid separation (CES) of digestate can improve its membrane filterability but potentially influence the environmental features of the separated solid fraction, thus hindering its possible agricultural reuse. In this study, the effects were assessed of different dosages of polyaluminum chloride (PAC), epichlorohydrine-dimethylamine with ethylendiamine (DEED) and polyacrilamides (PAM) on CES of digestate from biowaste in terms of Total Suspended Solid (TSS) mitigation in the liquid fractions and resulting environmental quality of the solid fractions. Results from lab-scale trials showed that applied chemicals significantly increased the centrifugation efficiency with achieving minimum TSS concentration of 2347 ± 281 mgTSS/L (up to 90% improved TSS mitigation). Also, performed treatments led to almost complete removal of P and Heavy Metals (HMs) from the liquid fractions after centrifugation. Conditioned solid fractions showed higher Al (reaching 20 g kg−1 TS), organic carbon and nitrogen content (up to 324 mgTOC kg−1 TS and 44.1 mgTKN kg−1 TS, respectively) due to residual PAC, DEED and PAM. However, achieved concentrations of HMs guaranteed full consistency with EU regulation limits established for agricultural reuse of organic soil amendments. Further, leaching tests performed on the treated solid fractions indicate higher chlorides and soluble Al concentrations in the water extracts (up to 4.6 g L−1 and 2.3 g L−1, respectively), but lower HMs leachability from the digestates undergone CES. Nevertheless, water extracts from treated biosolids were characterized by higher phytotoxicity, likely related with direct Al toxicity and increased salinity due to chemicals addition. Accordingly, the effects on soil–plant system should be better investigated when agricultural reuse of CES-treated solid fraction of digestate is foreseen. Graphic abstract

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“…The addition of exogenous functional materials to AD systems has attracted much attention for further improving the efficiency of AD. − Adding activated carbon to the sludge AD system has been shown to increase methane production and promote the degradation of biomass . The addition of granular activated carbon (GAC) during AD can significantly improve the average chemical oxygen demand removal rate and methane production, thereby allowing for a reduced hydraulic retention time and increased organic loading rate .…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Performance and Stability of the Co-anaerobic Digestion of Municipal Sludge and Food Waste by Granular Activated Carbon Dosing

et al. 2020

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This study investigated the effects of granular activated carbon (GAC) dosing on the co-anaerobic digestion of municipal sludge and food waste. It was found that methane production increased in the GAC systems. The cumulative methane production in the 1 g·L–1 GAC system was 12.14% higher than the control. The 1 g·L–1 GAC system started very quickly at the initial stage of anaerobic digestion (AD) and reached the highest methane production per day on the 3rd day, while the control appeared on the 10th day. The maximum methane production per day of the 1 g·L–1 experimental group was 12.27% higher than that of the control. The pH of the 1 g·L–1 experimental group varied less during the entire AD cycle. The reduction in sCOD, TS, and VS of the 1 g·L–1 GAC system were 48.95, 23.26, and 10.20% higher than the control, respectively. The dominant bacteria in the GAC systems were Thermotogae, Firmicutes, and Bacteroidetes, and these bacteria play very important roles in the hydrolysis and acidification stages. The main methanogen genus in the control was Methanosarcina, and those in the experimental systems were Methanobacterium and Methanolinea (which are hydrogenotrophic methanogenic archaea). These results indicate that the addition of GAC can relieve the acidification, reduce the AD start-up time, and promote the activities and growth of microorganisms to improve methane production by enhancing direct interspecific electron transfer and interspecies hydrogen transfer.

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Effects of woody biochar on dry thermophilic anaerobic digestion of organic fraction of municipal solid waste

Cited by 29 publications

References 60 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

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Enhancing the Performance and Stability of the Co-anaerobic Digestion of Municipal Sludge and Food Waste by Granular Activated Carbon Dosing

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