Review of Sustainable Methane Mitigation and Biopolymer Production

Karthikeyan, Obulisamy Parthiba; Chidambarampadmavathy, Karthigeyan; Cirés, Samuel; Heimann, Kirsten

doi:10.1080/10643389.2014.966422

Cited by 96 publications

(62 citation statements)

References 148 publications

(193 reference statements)

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“…However, some methanotrophic bacteria have been found to produce the poly-3-hydroxybutyrate (PHB) homopolymer from methane under nutrient limited condition. This ability has drawn researchers’ interest to use methane as an alternative source to produce value-added compounds (Karthikeyan et al, 2014; Strong et al, 2016). Up to 67% of PHB can be theoretically produced (Asenjo and Suk, 1986).…”

Section: Resource Recovery For a Circular Economymentioning

confidence: 99%

Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects

et al. 2017

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Limits in resource availability are driving a change in current societal production systems, changing the focus from residues treatment, such as wastewater treatment, toward resource recovery. Biotechnological processes offer an economic and versatile way to concentrate and transform resources from waste/wastewater into valuable products, which is a prerequisite for the technological development of a cradle-to-cradle bio-based economy. This review identifies emerging technologies that enable resource recovery across the wastewater treatment cycle. As such, bioenergy in the form of biohydrogen (by photo and dark fermentation processes) and biogas (during anaerobic digestion processes) have been classic targets, whereby, direct transformation of lipidic biomass into biodiesel also gained attention. This concept is similar to previous biofuel concepts, but more sustainable, as third generation biofuels and other resources can be produced from waste biomass. The production of high value biopolymers (e.g., for bioplastics manufacturing) from organic acids, hydrogen, and methane is another option for carbon recovery. The recovery of carbon and nutrients can be achieved by organic fertilizer production, or single cell protein generation (depending on the source) which may be utilized as feed, feed additives, next generation fertilizers, or even as probiotics. Additionlly, chemical oxidation-reduction and bioelectrochemical systems can recover inorganics or synthesize organic products beyond the natural microbial metabolism. Anticipating the next generation of wastewater treatment plants driven by biological recovery technologies, this review is focused on the generation and re-synthesis of energetic resources and key resources to be recycled as raw materials in a cradle-to-cradle economy concept.

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Section: Resource Recovery For a Circular Economymentioning

confidence: 99%

Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects

et al. 2017

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“…methanol); (ii) essential vitamins and growth supplements are supplied by the excretion of accompanying bacteria; (iii) consortia remain stable for long periods even in non‐sterile conditions, and (iv) higher PHB/PHA accumulations were achieved . However, there are number of unknowns and conflicting information exist in this budding research as detailed in our recent publication .…”

Section: Introductionmentioning

confidence: 95%

“…CH 4 is a prevailing greenhouse gas with global warming potential of 25 times higher than that of CO 2 ; contributing to 18% (i.e. 0.509 W⋅m −2 ) of the total atmospheric radiative forcing; and has an extended life span of 7–12 years in the atmosphere . According to a report by the Global Methane Initiative , anthropogenic CH 4 emissions were projected to reach 7904 MMT‐CO 2eq by 2020, which is 15% higher than recorded 2010 emissions (6875 MMT‐CO 2eq ).…”

Section: Introductionmentioning

confidence: 99%

Biopolymers made from methane in bioreactors

Chidambarampadmavathy

Karthikeyan

Heimann

2015

Engineering in Life Sciences

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Methane (CH4) is a potent greenhouse gas and mitigation is important to reduce global warming impacts. In this study, we aimed to convert CH4 to polyhydroxybutyrate (PHB; a biopolymer) by enrichment of methanotrophic consortia in bioreactors. Two different methanotrophic consortia were established form landfill top‐cover (landfill biomass [LB]) and compost soils (compost biomass [CB]), through cultivation under CH4:CO2:air (30:10:60) in batch systems. The established cultures were then used as inoculi (0.5 g LB or CB⋅L−1) in continuous stirred tank reactors (CSTRs) aerated with CH4:CO2:air at 0.25 L⋅min−1. Under stable CSTRs operating conditions, the effect of spiking with 1:1 copper:iron (final concentrations of 5μM) was tested. Methane oxidation capacity (MOC), biomass dry weight (DWbiomass), PHB, and fatty acid methyl esters (FAMEs) contents were used as effect parameters. A maximum MOC of 481.9 ± 8.9 and 279.6 ± 11.3 mg CH4⋅g−1 DWbiomass⋅h−1 was recorded in LB‐CSTR and CB‐CSTR, respectively, but PHB production was similar for both systems, that is 37.7 mg⋅g−1 DWbiomass. Treatment with copper and iron improved PHB production (22.5% of DWbiomass) in LB‐CSTR, but a reduction of 13.6% was observed in CB‐CSTR. The results indicated that CH4 to PHB conversion is feasible using LB‐CSTRs and addition of copper and iron is beneficial.

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“…Typically, PHAs are produced from various carbon sources, namely wheat bran, whey, molasses, cane starch, palm oil, cassava waste, ethanol, methanol, sucrose, glucose, vegetable waste, palm jaggery, waste oil, etc. . However, 30–50% of the PHA production costs are attributed to feed stocks, with the latter being considered as the bottleneck factor for these young industries .…”

Section: Introductionmentioning

confidence: 99%

“…However, 30–50% of the PHA production costs are attributed to feed stocks, with the latter being considered as the bottleneck factor for these young industries . In contrast, CH 4 is a much wasted carbon resource and could potentially be re‐routed for PHA production using CH 4 ‐oxidizing bacteria, that is methanotrophs .…”

Section: Introductionmentioning

confidence: 99%

Role of copper and iron in methane oxidation and bacterial biopolymer accumulation

Chidambarampadmavathy

Obulisamy

Heimann

2015

Engineering in Life Sciences

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The aim of this review was to elucidate the role of copper and iron in regulating methane (CH4) oxidation and subsequent biopolymer (i.e. polyhydroxyalkanoate [PHA]) accumulation in methanotrophic bacteria. Specifically, the review emphasizes the “copper switch mechanism” that alters CH4 oxidizing enzyme activities, that is soluble‐ and particulate methane monooxygenases, in type II methanotrophic bacteria. Both copper and iron are essential nutrients and reports demonstrate that addition of either can improve PHA accumulation. However, based on analyses of available data, a major knowledge gap regarding a clear understanding of the interactive effects in regulating methane monooxygenase enzyme activities/gene expressions was identified in this review.

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Review of Sustainable Methane Mitigation and Biopolymer Production

Cited by 96 publications

References 148 publications

Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects

Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects

Biopolymers made from methane in bioreactors

Role of copper and iron in methane oxidation and bacterial biopolymer accumulation

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