Thermophilic anaerobic biodegradation test and analysis of eubacteria involved in anaerobic biodegradation of four specified biodegradable polyesters

Yagi, Hisaaki; Ninomiya, Fumi; Funabashi, Masahiro; Kunioka, Masao

doi:10.1016/j.polymdegradstab.2013.03.010

Cited by 81 publications

(46 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The specific surface areas for PLAF and PLAB were calculated as ~54 and ~1.5 mm 2 g -1 respectively, indicating the much lower potential for microbial attack on PLAB. Yagi et al (2013Yagi et al ( , 2014 reported relatively high degradation rates in batch tests with PLA powder (125-250 μm), especially in thermophilic conditions.…”

Section: Discussionmentioning

confidence: 99%

Degradation of some EN13432 compliant plastics in simulated mesophilic anaerobic digestion of food waste

Zhang

Heaven

Banks

2018

Polymer Degradation and Stability

View full text Add to dashboard Cite

The research looked at the anaerobic biodegradation of 9 different bioplastics, all of which were commercially available and certified in Europe as compostable packaging material compliant with the biodegradation and other requirements of the EN13432 standard. A combination of testing strategies was used to assess the degree of degradation both under batch conditions, and in a simulation in which the plastics and food waste were fed daily to a digester for a period of 147 days. Two non-biodegradable plastics were used as controls, and verified the robustness of the sampling regime and the recovery of the plastic film, with errors of <1% in the final balance. The simulation allowed quantification of the weight loss of the plastics and determination of a decay coefficient for the different materials, which was then used to estimate long-term degradation. Use of a biochemical methane potential (BMP) batch test allowed estimation of the conversion of carbon into gaseous products. There was no evidence that any of the plastic films inhibited the anaerobic digestion process when continuously fed to digesters, although some inhibition occurred when the most readily degradable materials were tested at higher concentrations in batch mode. There were some interesting differences between results from the various measures of plastic degradation in the batch and simulation experiments, with batch testing in most cases suggesting a higher degree of degradation than was achieved in a semi-continuous system at a solids retention time of 50 days. The exceptions to this were two plastics that appeared to show rapid weight loss in the simulation experiment. BMP test results confirmed this was not through biological conversion of the bioplastic to gaseous carbon products, and was therefore probably due to physical disintegration. It was concluded that, of the 9 bioplastics tested, only 4 showed substantial biodegradability under anaerobic conditions. Further evidence to support the mechanism of biodegradation was obtained by microscopy, and photomicrographs using different techniques are included to illustrate the process. Even the most degradable materials would not break down sufficiently to meet the physical contaminant criteria of the UK PAS110 specification for anaerobically digested material, if fed to a digester at 0.5% of the input load on a volatile solids basis.

show abstract

Section: Discussionmentioning

confidence: 99%

Degradation of some EN13432 compliant plastics in simulated mesophilic anaerobic digestion of food waste

Zhang

Heaven

Banks

2018

Polymer Degradation and Stability

View full text Add to dashboard Cite

show abstract

“…Kolstad et al (2012) observed no biomethane evolution in mesophilic anaerobic digesters after 170 days, whereas others reported low conversion to biomethane from 12% at 77 days, 23% at 182 days, and up to 49% after 277 days (Yagi et al, 2009(Yagi et al, , 2014. In contrast, thermophilic anaerobic digestion of PLA was reported to yield higher rates of digestion with nearly 25% conversion to biomethane in 30 days and up to 75% in 75 days (Yagi et al, 2013). One study attempted pretreatment of PLA at 70 • C for 1 h with no pH control, but this resulted in less biomethane than untreated PLA (Endres and Siebert-Raths, 2011).…”

Section: Bioplastic Pretreatment and Bmp Assaysmentioning

confidence: 98%

“…Bioplastics were processed using methods similar to those reported by others (Witt et al, 2001;Yagi et al, 2013). Briefly, pelletized or thermoformed bioplastic samples were immersed in a liquid nitrogen bath for approximately 5 min to make them brittle and easier to grind, mechanically ground in a laboratory blender with a stainless steel canister (Waring 700G Commercial Blender), and sieved to less than 0.15 mm particle size.…”

Section: Bioplastic Processing and Pretreatmentmentioning

confidence: 99%

“…PHB was shown to anaerobically biodegrade over 90% in 10 days at mesophilic conditions, whereas polylactic acid (PLA) only biodegraded 7% in 90 days even though it is considered to be industrially compostable under aerobic thermophilic conditions (Yagi et al, 2014). Despite lesser biodegradability, PLA is more readily available on the market today due to more efficient production at full scale (Kolstad et al, 2012;Gómez and Michel, 2013;Yagi et al, 2013Yagi et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pretreatment and Anaerobic Co-digestion of Selected PHB and PLA Bioplastics

Benn

Zitomer

2018

Front. Environ. Sci.

105

View full text Add to dashboard Cite

Conventional petroleum-derived plastics are recalcitrant to biodegradation and can be problematic as they accumulate in the environment. In contrast, it may be possible to add novel, biodegradable bioplastics to anaerobic digesters at municipal water resource recovery facilities along with primary sludge to produce more biomethane. In this study, thermal and chemical bioplastic pretreatments were first investigated to increase the rate and extent of anaerobic digestion. Subsequently, replicate, bench-scale anaerobic co-digesters fed synthetic primary sludge with and without PHB bioplastic were maintained for over 170 days. Two polyhydroxybutyrate (PHB), one poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and one polylactic acid (PLA) bioplastic were investigated. Biochemical methane potential (BMP) assays were performed using both untreated bioplastic as well as bioplastic pretreated at elevated temperature (35-90 • C) under alkaline conditions (8

show abstract

“…The energy that comes after mineralization process is used by the microorganism and biomass [64]. Although biological energy comes to the oxidation process but in case of anaerobic organism, they use alternative electron acceptor like sulphate and nitrates to induce a change in the activity of microbial population [65]. Itavaara et al have studied the degradation rate of polylactic acid and poly-L-lactic acid in aquatic condition degraded by soil bacteria [66].…”

Section: Anaerobic Bio-degradation By Bacteriamentioning

confidence: 99%

Sustainability of bioplastics: Opportunities and challenges

Thakur

Chaudhary

Sharma

et al. 2018

Current Opinion in Green and Sustainable Chemistry

245

View full text Add to dashboard Cite

Recycling is groundwork of the worldwide efforts to diminish the amount of plastics in waste. Mostly around 7.8-8.2 million tons of poorly-used plastics enter the oceans every year. Nonbiodegradable plastics settlements in landfills are uncertain, which hinders the production of land resources. Non-biodegradable plastic solid wastes, carbon dioxide, greenhouse gases, various air pollutants, cancerous polycyclic aromatic hydrocarbons and dioxins, released to the environment cause severe damage and harmfulness to the inhabitants. Due to the bio-degradability and renewability of biopolymers, petroleum-based plastics can be replaced with bio-based polymers in order to minimize the environmental risks. In this review article, bio-degradability of polymers has been discussed. The mechanisms of bio-recycling have been particularly emphasized in the present article.

show abstract

Thermophilic anaerobic biodegradation test and analysis of eubacteria involved in anaerobic biodegradation of four specified biodegradable polyesters

Cited by 81 publications

References 19 publications

Degradation of some EN13432 compliant plastics in simulated mesophilic anaerobic digestion of food waste

Degradation of some EN13432 compliant plastics in simulated mesophilic anaerobic digestion of food waste

Pretreatment and Anaerobic Co-digestion of Selected PHB and PLA Bioplastics

Sustainability of bioplastics: Opportunities and challenges

Contact Info

Product

Resources

About