Accelerated Carbonation of Coal Combustion Fly Ash for Atmospheric Carbon dioxide Sequestration and Soil Amendment: An Overview

Nl, Ukwattage; Ranjith, P.G.

doi:10.4172/2375-4397.1000210

Cited by 5 publications

(1 citation statement)

References 60 publications

(169 reference statements)

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“…"Studies also indicated that the effectiveness of biochar in the immobilization of heavy metals strongly depends on the metal contaminant type, the biomass feed stocks used and the pyrolysis conditions" [13]. Microstructural level analysis are underway to investigate the mechanism of metal ion retention in Ultisol soils added with coal fly ash and avocado branch cut biochar [14].…”

Section: Discussionmentioning

confidence: 99%

Agro-Waste Biochar to Reduce the Leaching of Heavy Metals from Coal Fly Ash Amended Soil

Ukwattage N. L.,

Li Y.,

Lakmalie U. V.

et al. 2023

ASRJ

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The soils added with coal fly ash may contain heavy metals potentially up to the levels of toxicity. Biochars have been successfully used in the past to reduce the bioavailability and leaching of heavy metals in contaminated soils. Therefore, the co-application of biochar together with coal fly ash could positively change the bioavailability and leaching characteristics of heavy metals in sandy soils through various fixing mechanisms. In the present study, the authors investigated the effect of agro-waste biochar in modifying the leaching loss of heavy metals from coal fly ash contaminated soils. Column leaching tests with simulated rainfall conditions were conducted for sandy Ultisol soils mixed with coal fly ash and avocado branch cut biomass biochar at 5 tons/ha rate. The results showed the presence of heavy metals in the leachate of fly ash added soil. Application of biochar significantly reduced the leachability of all the tested heavy metals in the study. The reduction rates were up to 55% compared to non-amended samples. Therefore, the agro-waste biochar can effective be used in stabilizing the heavy metals in coal fly ash contaminated soils, to minimize the risk of environmental contamination.

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Section: Discussionmentioning

confidence: 99%

Agro-Waste Biochar to Reduce the Leaching of Heavy Metals from Coal Fly Ash Amended Soil

Ukwattage N. L.,

Li Y.,

Lakmalie U. V.

et al. 2023

ASRJ

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Mineral carbonation using alkaline waste and byproducts to reduce CO2 emissions in Taiwan

Iizuka²,

Lee³

et al. 2022

Environ Chem Lett

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A Review on CO2 Sequestration: The Indian Scenario

Pattanaik

Nayak

2023

Journal of the Geological Society of India

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To address the carbon dioxide (CO2) and other green-house gas (GHG) emission issues and combat climate change, various world summits have taken place starting with the United Nations Framework Convention on Climate Change (UNFCCC) at Rio in 1992 to the COP26 at Glasgow in 2021. Although the Paris Agreement of 2015, a legally binding international treaty intended to keep global average temperature rise below 2°C (preferably 1.5°C), it appears too tough a target considering the present day scenarios of insincerity by the advanced and rich nations. On the other hand, adaptation of CCS (carbon capture and storage) technologies in industrial scale have not yet been possible because of economic unviability. Although the western countries such as the USA and the EU have invested considerable amount of funds for R&D to make the CCS technologies successful, the developed technologies are only up to the pilot scale. More funding and focused R&D are needed to make the proven CCS technologies economic in industrial scales. The R&D efforts by other countries are still insignificant. India being the fourth largest emitter of GHGs in the world, is a signatory to most of the global treaties and is trying to adopt various CCS technologies. However, no significant progress has been made so far although some initiations have been observed after the recent pledge made by the Hon. Prime Minister of India in COP26 at Glasgow for a ‘net zero’ carbon by 2070. Industrial utilization of CO2 is negligible in the country except that Tata Steel Ltd. recently installed a demonstration carbon capture plant (5 TPD CO2) at its Jamshedpur works. There are no visible efforts from the power sectors who are one of the major contributors of CO2. Future availability of CCS technologies to Indian industries shall primarily be determined by the investments they make in R&D to develop the technologies on their own or in collaboration with research laboratories. Substituting carbon with green hydrogen and using renewable energy to run the steel plants would be desirable. Implementation of costly CCS technologies in India would need incentives from government as well as involvement and financial commitment from private industries which has been very low over the years. In this article we have taken a fresh stock of the situation with respect to the global targets set, efforts being made, technological interventions and their adaptability, R&D efforts required, funding opportunities, promises made, the gaps in available technologies, and target accomplishments. Indian status has been reviewed with respect to CCS: where does it stand, what are the challenges and what is the way forward for this fast-growing developing country to address the climate change keeping a balance with its fast growth rate.

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Accelerated Carbonation of Coal Combustion Fly Ash for Atmospheric Carbon dioxide Sequestration and Soil Amendment: An Overview

Cited by 5 publications

References 60 publications

Agro-Waste Biochar to Reduce the Leaching of Heavy Metals from Coal Fly Ash Amended Soil

Agro-Waste Biochar to Reduce the Leaching of Heavy Metals from Coal Fly Ash Amended Soil

Mineral carbonation using alkaline waste and byproducts to reduce CO2 emissions in Taiwan

A Review on CO2 Sequestration: The Indian Scenario

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