Abstract
A mixed methanotrophic consortium (MMC) is generally considered to be a complex mixed culture system where methanotrophs predominate and coexist with other microorganisms. MMCs not only have the unique characteristics of methanotrophs like methane assimilation and broad substrate range but also can overcome the shortcomings in pure methanotrophic cultivation like slow growth rate, difficulty in growing high cell density, and poor MMO stability, indicating their promising prospects in environmental bioengineering and biocatalysis. This chapter focuses on the acquisition of MMCs, interactions among methanotrophs and their coexisting heterotrophs, and recent highlights on theoretical research and engineering trials. MMCs can be obtained through enrichment culture from methane-rich environments, mixing different methanotrophs together or stimulating the indigenous methane-oxidizing bacteria for in situ applications. Large-scale and rapid preparation and long-term preservation of MMCs with stable function and community structure are achievable by appropriate methods. Methanotrophs and the coexisting heterotrophs in MMCs can exchange metabolites and also interact with each other via more complex metabolisms and synergic effects, forming a huge, multi-role, and dynamic ecological network. In environmental bioengineering, applying MMCs in methane mitigation and co-metabolism of contaminants are more promising. Single cell protein is a useful bioproduct capable of being produced by MMCs, and biopolymer like PHB by MMCs also has bright prospect. Combined with other functional systems and exploration of biological dark matter of a consortium, MMCs can greatly expand the application fields. With the advances in multi-omic analysis of methanotrophs and the development of synthetic biology and ecoinformatics, more achievements for MMCs can be expected.
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Abbreviations
- 1,1-DCE:
-
1,1-dichloroethylene
- AME-D:
-
aerobic methane oxidation coupled to denitrification
- BTZ:
-
benzotriazole
- cDCE:
-
cis-l,2-dichloroethylene
- CSTR:
-
continuous stirred tank reactor
- DMSO:
-
dimethyl sulfoxide
- DO:
-
dissolved oxygen
- DW:
-
dry weight
- HCFCs:
-
hydrochlorofluorocarbons
- HFCs:
-
hydrofluorocarbons
- LAS:
-
alkylbenzene sulfonate
- MMC:
-
mixed methanotrophic consortium
- MMCs:
-
mixed methanotrophic consortia
- MMO:
-
methane monooxygenase
- MOB:
-
methane-oxidizing bacteria
- MOC:
-
methane oxidation capacity
- NMS:
-
nitrate mineral salt
- PFR:
-
plug flow reactor
- PHA:
-
polyhydroxyalkanoate
- PHB:
-
polyhydroxybutyrate
- pMMO:
-
particulate methane monooxygenase
- RuMP:
-
ribulose monophosphate
- SCP:
-
single cell protein
- sMMO:
-
soluble methane monooxygenase
- SMX:
-
sulfamethoxazole
- TCE:
-
trichloroethylene
- t-DCE:
-
trans-1,2-dichloroethylene
- TT:
-
trehalose and tryptic soy broth
- VC:
-
vinyl chloride
- VSS:
-
volatile suspended solids
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Jiang, H., Xing, XH. (2018). Mixed Methanotrophic Consortium for Applications in Environmental Bioengineering and Biocatalysis. In: Kalyuzhnaya, M., Xing, XH. (eds) Methane Biocatalysis: Paving the Way to Sustainability. Springer, Cham. https://doi.org/10.1007/978-3-319-74866-5_15
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