Long-term performance of anaerobic digestion for crop residues containing heavy metals and response of microbial communities

Lee, Jongkeun; Kim, Joonrae Roger; Jeong, Seulki; Cho, Jinwoo; Kim, Jae Young

doi:10.1016/j.wasman.2016.10.005

Cited by 55 publications

(18 citation statements)

References 44 publications

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“…The abundance of Bacteroidia and Clostridia in the AD process that was previously reported by Wang et al . and Lee et al ., agrees with the results obtained in this study. The contribution of Bacteroidetes might be associated with acetic acid production for syntrophic bacteria and utilization of organic matter .…”

Section: Discussionsupporting

confidence: 93%

Metagenomic insights into the microbial community and biogas production pattern during anaerobic digestion of cow dung and mixed food waste

Mukhuba

Roopnarain

Moeletsi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: The uncontrolled overproduction of fruit and vegetable waste causes serious environmental challenges such as emission of greenhouse gases. Anaerobic digestion (AD) is becoming a widely adopted technology for treatment of food waste with the concomitant production of biogas. This study investigated the link between microbial community structure and biogas production when using cow dung and mixed fruit and vegetable waste (MFVW) as substrates.RESULTS: Semi-continuous stir tank reactors were used for AD of cow dung and MFVW over a period of 40 days. The highest accumulative methane yield (112.9 L) was obtained from co-digestion, intermediate yield (59.5 L) was obtained from cow dung and lowest yield (6.1 L) from MFVW at the end of the digestion experiment. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) revealed higher bacterial and archaeal diversity indices in co-digestion in comparison to mono-digestion of cow dung and MFVW. High-throughput sequence analyses showed that operational taxonomic units (OTUs) belonging to the phyla Bacteroidetes, followed by Firmicutes, Actinobacteria and Proteobacteria were dominant in all treatments. CONCLUSION:The results of the study demonstrated that the enhanced methane production in co-digestion could be attributed to the neutral pH and partial shift of archaea from Methanosaeta to Methanosarcina rich communities.

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Section: Discussionsupporting

confidence: 93%

Metagenomic insights into the microbial community and biogas production pattern during anaerobic digestion of cow dung and mixed food waste

Mukhuba

Roopnarain

Moeletsi

et al. 2019

J of Chemical Tech & Biotech

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“… Xu et al (2017) reported that low concentrations of Cd (0.1 mg/g VSS) benefited hydrolysis and acidogenesis and increased the microbial diversity, the abundance of functional microbes, and the activities of key enzymes during the anaerobic fermentation of sludge, whereas higher concentrations of Cd (10 mg/g VSS) inhibited these factors. Lee et al (2017) used sunflowers harvested in a heavy metal-contaminated site (3.98 mg Cd) for anaerobic digestion and found that the continuously stirred-tank reactor remained stable for 20 days and that the microorganisms in the reactor did not suffer from extraneous toxic substances. Hence, substrates with exogenous and endogenous Cd can be used for sustainable biogas production.…”

Section: Discussionmentioning

confidence: 99%

The enhancement by arbuscular mycorrhizal fungi of the Cd remediation ability and bioenergy quality-related factors of five switchgrass cultivars in Cd-contaminated soil

Sun

Xie

Zheng

et al. 2018

PeerJ

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A greenhouse experiment was carried out to investigate the effects of arbuscular mycorrhizal fungi (AMF) on the growth, P and Cd concentrations and bioenergy quality-related factors of five cultivars of switchgrass, including three lowland cultivars (Alamo (Ala), Kanlow (Kan), Performer (Per)) and two highland cultivars (Blackwell (Bw), Summer (Sum)), with 0, 1 and 10 mg/kg Cd addition levels. The results showed that AMF inoculation notably increased the biomass and P concentrations of all the cultivars. The Cd concentrations in the roots were higher than those in the shoots of all cultivars irrespective of inoculation, but the AMF had different effects on Cd accumulation in highland and lowland cultivars. AMF inoculation decreased the shoot and root concentrations in Ala and Kan, increased the shoot and root concentrations of Cd in Bw and Sum, and increased shoot Cd concentrations and decreased root Cd concentrations in Per. The highest Cd concentrations were detected in the roots of Bw and in the shoots of Sum with AMF symbiosis. Bw contained the highest total extracted Cd which was primarily in the roots. Ala had the second highest extracted Cd in the shoots, reaching 32% with 1 mg/kg of added Cd, whereas Sum had the lowest extracted Cd. AMF symbiosis had varied effects on bioenergy quality-related factors: for example, AMF decreased the ash lignin content in Ala and the C/N in Sum, increased the nitrogen, gross calorie values, and maintained the hemicellulose and cellulose contents in all cultivars with all tested concentrations of Cd. A principal component analysis (PCA) showed that AMF inoculation could enhance, weaken or transform (positive-negative, PC1-PC2) the correlations of these factors with the principle components under Cd stress. Therefore, AMF symbiosis enhanced the growth of different cultivars of switchgrass, increased/decreased Cd accumulation, promoted Cd extraction, and regulated the bioenergy quality-related factors in Cd-polluted areas. Bw is a suitable cultivar for phytostabilization due to high root Cd stabilization, whereas Ala is an appropriate cultivar for phytoremediation of less polluted areas because of its high Cd extraction and excellent bioenergy quality.

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“…Among other species, Helianthus annuus has been extensively used to remove metals from soils. For instance, Lee et al [146] investigated the long-term stability performance of the anaerobic digestion process of a continuous-stirred-tank reactor (CSTR) operated for 1100 days with sunflower harvested in a potential toxic-metal-contaminated site (all parts of the sunflower were used, such as stem, leaf, and flower). It was found that soluble metal concentrations were lower than the reported inhibitory level and the reactor performance remained stable up to an organic loading rate (OLR) of 2.0 g volatile solids (VS)/L/day at a hydraulic retention time (HRT) of 20 days.…”

Section: Gaseous Bioenergymentioning

confidence: 99%

Coupling Plant Biomass Derived from Phytoremediation of Potential Toxic-Metal-Polluted Soils to Bioenergy Production and High-Value by-Products—A Review

et al. 2021

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Phytoremediation is an attractive strategy for cleaning soils polluted with a wide spectrum of organic and inorganic toxic compounds. Among these pollutants, heavy metals have attracted global attention due to their negative effects on human health and terrestrial ecosystems. As a result of this, numerous studies have been carried out to elucidate the mechanisms involved in removal processes. These studies have employed many plant species that might be used for phytoremediation and the obtention of end bioproducts such as biofuels and biogas useful in combustion and heating. Phytotechnologies represent an attractive segment that is increasingly gaining attention worldwide due to their versatility, economic profitability, and environmental co-benefits such as erosion control and soil quality and functionality improvement. In this review, the process of valorizing biomass from phytoremediation is described; in addition, relevant experiments where polluted biomass is used as feedstock or bioenergy is produced via thermo- and biochemical conversion are analyzed. Besides, pretreatments of biomass to increase yields and treatments to control the transfer of metals to the environment are also mentioned. Finally, aspects related to the feasibility, benefits, risks, and gaps of converting toxic-metal-polluted biomass are discussed.

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Long-term performance of anaerobic digestion for crop residues containing heavy metals and response of microbial communities

Cited by 55 publications

References 44 publications

Metagenomic insights into the microbial community and biogas production pattern during anaerobic digestion of cow dung and mixed food waste

Metagenomic insights into the microbial community and biogas production pattern during anaerobic digestion of cow dung and mixed food waste

The enhancement by arbuscular mycorrhizal fungi of the Cd remediation ability and bioenergy quality-related factors of five switchgrass cultivars in Cd-contaminated soil

Coupling Plant Biomass Derived from Phytoremediation of Potential Toxic-Metal-Polluted Soils to Bioenergy Production and High-Value by-Products—A Review

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