Reclamation of ultra-fine coal with scenedesmus microalgae and comprehensive combustion property of the Coalgae® composite

Ejesieme, Vitus O.; Riaza, Juan; Vorster, Nicole; Dugmore, Gary; Zeelie, Ben

doi:10.17159/2413-3051/2020/v31i1a6430

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…The risk assessment model consists of three aspects: pollutant exposure calculation, pollutant toxicity calculation, and risk calculation. The first two calculations are based on the model recommended in the "Technical Guidelines for Risk Assessment of Polluted Sites" issued by the Ministry of Environmental Protection of China [34].…”

Section: Risk Assessment Methods For Microbial-plant Collaborative Re...mentioning

confidence: 99%

Microbial–Plant Collaborative Remediation of Cd-Contaminated Wastewater and Soil in the Surrounding Area of Nuclear Power Plants and Risk Assessment

Wei,

Song

2023

Sustainability

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The continuous development of China’s nuclear industry has caused an increasingly serious problem of heavy metal pollution in the ecological environment. A survey of the current situation shows that the quality of China’s groundwater bodies and their surrounding ecological environment has been severely affected. China has started to devote more attention to the issue of nuclear emissions and pollution. In view of this, this study takes an area contaminated by nuclear power plant emissions as the object of research and uses plant–microbe synergy to remediate the cadmium-contaminated environment. Cadmium-tolerant strains were isolated from the soil and identified as Serratia marcescens. The morphological characteristics of the cadmium-tolerant strains were observed with electron microscopy in the presence or absence of cadmium ions. The removal of Cd2+ from wastewater was analyzed in four experimental groups: Cd2+ removal from Cd2+-contaminated wastewater by combining a Cd-tolerant strain with Cd-flower, Cd-tolerant strain with Cd-flower, Cd-flower with alkali treatment, and Cd-tolerant strain with alkali treatment. This study innovatively treated Cd ion concentrations of 50 mg/L, 100 mg/L, 200 mg/L, and 300 mg/L. The results showed that the cadmium-tolerant strains were more densely concentrated in the treated Phyllostachys than in the untreated condition. This indicates that the Cd-tolerant strains were effectively enhanced by the alkali treatment of Phyllostachys spp. and that the adsorption of Cd ions to the Cd-tolerant strains was improved. In the presence of Cd2+ flowers only, the best removal of Cd2+ was achieved at a concentration of 50 mg/L, with a removal rate of 74.10%; the addition of Cd-tolerant strains resulted in a removal rate of 91.21%. When the alkali treatment was applied to the flat bamboo flowers, the removal rate was 84.36% when the concentration of Cd2+ was 100 mg/L. Then, when the cadmium-tolerant strain was added to the treated flat bamboo flower group, the maximum removal rate was 89.74% when the concentration of Cd2+ was 100 mg/L. The cadmium ion content of Cd2+ increased positively with increasing experimental time. In addition, the quasi-secondary correlation coefficients for cadmium ions in Lobelia were all greater than 0.9905, indicating that the adsorption kinetics were significantly correlated with the quasi-secondary kinetics. The analysis of heavy metal enrichment in Lobelia was divided into four groups, with Lobelia showing the best tolerance and cadmium adsorption capacity at a cadmium concentration of 20 mg/L. The results of super-enrichment coefficients showed that the enrichment coefficients of Lobelia ranged from 1.03 to 1.97, with values greater than 1. All these results indicate that the combination of cadmium-tolerant strains and plants can effectively remediate nuclear-contaminated soil and wastewater, thus improving soil availability and water regeneration, and improving the human living environment.

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Section: Risk Assessment Methods For Microbial-plant Collaborative Re...mentioning

confidence: 99%

Microbial–Plant Collaborative Remediation of Cd-Contaminated Wastewater and Soil in the Surrounding Area of Nuclear Power Plants and Risk Assessment

Wei,

Song

2023

Sustainability

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“…The effect of biochar and compost combined (B+C) and their different proportions on the adsorptiondesorption behavior of Heavy Metal contaminated soil is studied. The biochar mixture, compost, and biochar are applied to rural Heavy Metal contaminated soil in different proportions (w/w = remediation agent/soil) [33][34][35]. Biochar and compost are mixed evenly into the soil to be repaired at the weight ratios of 0:100, 10:90, 20:80, 40:60, 60:40, and 100:0, respectively.…”

Section: Preparation Of a Biocarbon-compost Remediation Agentmentioning

confidence: 99%

Innovative Practice of Heavy Metal Soil Remediation Technology under the Background of Rural Revitalization by Integrating Agriculture, Culture and Tourism

Wu,

Wan

2024

Pol. J. Environ. Stud.

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With the development and modernization of rural economies, the integration of agriculture, cultural tourism, and other fields has gradually become a new driving force for promoting rural revitalization. However, in recent years, the development of mines and the utilization of resources have led to severe heavy metal pollution of farmland soil, causing significant food safety risks and economic losses, which pose serious challenges to the integration of agriculture, culture, and tourism. Therefore, China has invested a lot of attention in addressing the issue of soil remediation in abandoned rural mining areas. The study focuses on an abandoned mining area polluted by heavy metals such as Cd, Zn, and Cu in a certain area. Two materials, biochar and compost, were added to the soil in the polluted area, and the weight ratios of biochar and compost were set to 0:100, 10:90, 20:80, 40:60, 60:40, and 100:0. A new type of biochar was prepared by mixing two materials at high temperatures, and its effects on the pH and organic carbon content of soil in heavy metal polluted rural abandoned mining areas were explored. The effective removal and adsorption of heavy metals in the soil were also investigated, as was the promotion of crop growth in the soil area. This indicates that the use of biochar and compost can significantly repair heavy metal contaminated soil in mining areas and improve soil availability. Meanwhile, research has found that the integration of agriculture, culture, and tourism provides a unique perspective on soil remediation technology, which may involve maintaining rural cultural traditions, enhancing the attractiveness of rural tourism, and ensuring food safety and agricultural sustainability. Therefore, the selection and implementation of repair technologies need to consider multiple factors to ensure the triple benefits to the economy, society, and environment.

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“…Moreover, this microalgae strain has been observed to offer higher values, i.e., 77.5 wt.% of volatile matter, 21.4 wt.% of calorific value, and low ash content (7.3 wt.%) [ 246 ]. Scenedesmus biomass blended with discarded ultra-fine coal has shown a prominent synergistic effect, upgrading the ignition temperature and the rate of combustion [ 247 ].…”

Section: Coal Microalgae Hold Great Biotechnological Potential In Coa...mentioning

confidence: 99%

Biotechnology of Microorganisms from Coal Environments: From Environmental Remediation to Energy Production

Akimbekov

Digel

Tastambek

et al. 2022

Biology

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It was generally believed that coal sources are not favorable as live-in habitats for microorganisms due to their recalcitrant chemical nature and negligible decomposition. However, accumulating evidence has revealed the presence of diverse microbial groups in coal environments and their significant metabolic role in coal biogeochemical dynamics and ecosystem functioning. The high oxygen content, organic fractions, and lignin-like structures of lower-rank coals may provide effective means for microbial attack, still representing a greatly unexplored frontier in microbiology. Coal degradation/conversion technology by native bacterial and fungal species has great potential in agricultural development, chemical industry production, and environmental rehabilitation. Furthermore, native microalgal species can offer a sustainable energy source and an excellent bioremediation strategy applicable to coal spill/seam waters. Additionally, the measures of the fate of the microbial community would serve as an indicator of restoration progress on post-coal-mining sites. This review puts forward a comprehensive vision of coal biodegradation and bioprocessing by microorganisms native to coal environments for determining their biotechnological potential and possible applications.

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Reclamation of ultra-fine coal with scenedesmus microalgae and comprehensive combustion property of the Coalgae® composite

Cited by 8 publications

References 29 publications

Microbial–Plant Collaborative Remediation of Cd-Contaminated Wastewater and Soil in the Surrounding Area of Nuclear Power Plants and Risk Assessment

Microbial–Plant Collaborative Remediation of Cd-Contaminated Wastewater and Soil in the Surrounding Area of Nuclear Power Plants and Risk Assessment

Innovative Practice of Heavy Metal Soil Remediation Technology under the Background of Rural Revitalization by Integrating Agriculture, Culture and Tourism

Biotechnology of Microorganisms from Coal Environments: From Environmental Remediation to Energy Production

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