A critical review on CO₂ sequestration using construction and demolition waste: Future scope and perspective

Shaniv Kumar Tiwari,Ki-Hyun Kim,Ram Sharan Singh,Jechan Lee,Taejin Kim,Jurgen Mahlknecht,Balendu Shekher Giri,Manish Kumar 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3

In recent years, the building industry has looked for technological ways to protect the environment and preserve natural resources. Since the COVID-19 epidemic, there has been a shortage of building materials, which has caused construction costs to go up. This has made it more important for sustainable development to be based on the principles of the circular economy. This gives an opportunity to utilise various reliable materials as substitutes, like construction and demolition (C&D) waste. (C&D) wastes are made up of a large chunk of all solid waste, which causes many environmental problems. The most important factor in the struggle against climate change is the reduction of CO₂ emissions from the construction sector. At the same time, globally, climate change caused in part by carbon dioxide (CO₂) emissions is an important problem that requires innovative carbon sequestration strategies. Because C&D waste is alkaline-rich (e.g., calcium hydroxide and calcium-silicate-hydrate (C-S-H)), it can be used to sequester CO₂ by converting it into thermodynamically stable carbonates. Temperature, partial pressure of CO₂, time, process route, humidity, and the water-to-solid ratio (w/s) can affect the CO₂ sequestration over the C&D wastes.

Progress in bioremediation of pesticide residues in the environment

Balendu Shekher Giri,Sachin Geed,Kumar Vikrant,이상수,김기현,Suresh Kumar Kailasa,Meththika Vithanage,Preeti Chaturvedi,Birendra Nath Rai,Ram Sharan Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6

The increasing use of various pesticides (e.g., organophosphate, organochlorine, carbamates, and pyrethroid) has helped to improve agricultural productivity by minimizing the potential crop losses associated with insect attacks. Owing to their highly recalcitrant nature, most pesticides and their residues often accumulate in the environment to exert deleterious effects on human health and various ecosystems. Among a variety of remediation options, biological approaches have attracted a widespread attention for the treatment of pesticide in soil/water systems due to their environmentally benign nature. In this regard, this review article was organized to highlight the recent advancements in the application of various bioremediation approaches for the degradation/removal of pesticides from soil/water matrixes along with the catabolic capacity of microorganisms. Our discussions were expanded further to emphasize identification of specific bacterial communities/strains, such as Bacillus sp. and Pseudomonas sp. This review is expected to provide an overview of the modern biotechnological methodologies along with the associated merits and hurdles for the effective abatement of pesticides.

Engineered/designer biochar for the removal of phosphate in water and wastewater

Vikrant, Kumar,Kim, Ki-Hyun,Ok, Yong Sik,Tsang, Daniel C.W.,Tsang, Yiu Fai,Giri, Balendu Shekhar,Singh, Ram Sharan Elsevier 2018 Science of the Total Environment Vol.616 No.-

<P><B>Abstract</B></P> <P>During the past decade, biochar has attracted immense scientific interest for agricultural and environmental applications. A broad range of biochars with advantageous properties (e.g., high surface area, flexible architecture, and high porosity) has been developed for pollution abatement. Nevertheless, biochar suffers from certain drawbacks (e.g., limited sorption capacity for anions and poor mechanical properties) that limit their practical applicability. This review focuses on recent advancements in biochar technology, especially with respect to its technical aspects, the variables associated with removing phosphates from water, and the challenges for such abatement. The attention paid to the specific remediation of phosphate from water using biochar is limited (n=1114 – Scopus) compared to the application of biochar to other common water pollutants (n=3998 – Scopus). The subject warrants immediate rigorous research because of the undesirable effects of excess phosphate in water bodies. This review will thus facilitate the construction of a roadmap for further developments and the expansion of this challenging area of research.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The control of excess aqueous phosphate is a crucial task in environmental management. </LI> <LI> Elevated levels of phosphate in water systems can increase the costs of water treatment. </LI> <LI> The easy fabrication and structural flexibility of biochars ensure the efficient removal of P. </LI> <LI> We propose various options to apply biochars in the area of phosphate sorption and separation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Recent advancements in bioremediation of dye: Current status and challenges

Vikrant, Kumar,Giri, Balendu Shekhar,Raza, Nadeem,Roy, Kangkan,Kim, Ki-Hyun,Rai, Birendra Nath,Singh, Ram Sharan Elsevier 2018 Bioresource technology Vol.253 No.-

<P><B>Abstract</B></P> <P>The rampant industrialization and unchecked growth of modern textile production facilities coupled with the lack of proper treatment facilities have proliferated the discharge of effluents enriched with toxic, baleful, and carcinogenic pollutants including dyes, heavy metals, volatile organic compounds, odorants, and other hazardous materials. Therefore, the development of cost-effective and efficient control measures against such pollution is imperative to safeguard ecosystems and natural resources. In this regard, recent advances in biotechnology and microbiology have propelled bioremediation as a prospective alternative to traditional treatment methods. This review was organized to address bioremediation as a practical option for the treatment of dyes by evaluating its performance and typical attributes. It further highlights the current hurdles and future prospects for the abatement of dyes <I>via</I> biotechnology-based remediation techniques.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Presence of dyes is linked with multitude of problems causing ecological imbalances. </LI> <LI> The effective treatment of dyes is a vital task in environmental pollution control. </LI> <LI> For this, cost-effectiveness, environmental benignity, and ease of operation is important. </LI> <LI> MFCs along with the generation of electricity can be the best alternatives for their abatement. </LI> </UL> </P>

Biofiltration of hydrogen sulfide: Trends and challenges

Vikrant, Kumar,Kailasa, Suresh Kumar,Tsang, Daniel C.W.,Lee, Sang Soo,Kumar, Pawan,Giri, Balendu Shekhar,Singh, Ram Sharan,Kim, Ki-Hyun Elsevier 2018 JOURNAL OF CLEANER PRODUCTION Vol.187 No.-

<P><B>Abstract</B></P> <P>Expansion of modern industry coupled with a lack of effective treatment systems has resulted in excessive release of toxic and odorous pollutants such as hydrogen sulfide (H<SUB>2</SUB>S). Development of treatment measures is therefore necessary to protect ecosystems and human health. This paper explores recent advances in H<SUB>2</SUB>S treatment technologies. Particular focus is placed on innovative and recent advances in biofiltration, especially for wastewater treatment facilities and biogas generation (e.g., use of innovative packing media for better performance and reduced pressure drop, eliminating sulfate accumulation, and development of modeling techniques). The review also identifies current challenges and future prospects (e.g., fluctuations in methane and carbon dioxide concentrations during biogas upgradation, optimizing anoxic H<SUB>2</SUB>S biofiltration, and understanding the effects of operating conditions on biofilter performance) for improving biofiltration by highlighting research gaps in related fields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrogen sulfide (H<SUB>2</SUB>S) is a water-soluble gas with the characteristic malodor. </LI> <LI> In this review, we briefly discussed the physicochemical properties and sources of H<SUB>2</SUB>S. </LI> <LI> We dealt biological approaches for the removal of H<SUB>2</SUB>S. </LI> <LI> The challenges and prospects related to these treatment methods are also described. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Biodegradation of toluene vapor by evaporative cooler model based biofilter

Kumar Vikrant,Harshil Nagar,Raja Anand,Anjney Sharma,Sang-Hun Lee,Balendu Shekher Giri,Ki-Hyun Kim,Ram Sharan Singh 한국분석과학회 2018 분석과학 Vol.31 No.2

Biodegradation of toluene vapor by evaporative cooler model based biofilter

Vikrant, Kumar,Nagar, Harshil,Anand, Raja,Sharma, Anjney,Lee, Sang-Hun,Giri, Balendu Shekher,Kim, Ki-Hyun,Singh, Ram Sharan The Korean Society of Analytical Science 2018 분석과학 Vol.31 No.2

The biodegradation of toluene vapor was investigated using a new type of biofilter equipped with a laboratory-scale evaporative cooler model packed with wood wool fibers (area: $360cm^2$). For the purpose of this study, the biofilter system was inoculated with Pseudomonas sp. RSST (MG 279053). The performance of this biofilter, assessed in terms of toluene removal efficiency (and elimination capacity), was as high as 99 % at a loading rate of $6g/h{\cdot}m^2$. The toluene removal efficiency decreased in an exponential manner with the increase in the loading rate. The cooler model-based biofilter was able to remove more than 99 % of toluene using Pseudomonas sp. RSST (MG 279053) as an effective inoculum. This biofilter is designed to operate under batch conditions for the removal of toluene in confined environments (e.g., automotive plants, boiler rooms in manufacturing facilities, and offshore drilling platforms).

Progress in bioremediation of pesticide residues in the environment

Balendu Shekher Giri,Sachin Geed,Kumar Vikrant,Sang Soo Lee,Ki-Hyun Kim,Suresh Kumar Kailasa,Meththika Vithanage,Preeti Chaturvedi,Birendra Nath Rai,Ram Sharan Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6

The increasing use of various pesticides (e.g., organophosphate, organochlorine, carbamates, and pyrethroid) has helped to improve agricultural productivity by minimizing the potential crop losses associated with insect attacks. Owing to their highly recalcitrant nature, most pesticides and their residues often accumulate in the environment to exert deleterious effects on human health and various ecosystems. Among a variety of remediation options, biological approaches have attracted a widespread attention for the treatment of pesticide in soil/water systems due to their environmentally benign nature. In this regard, this review article was organized to highlight the recent advancements in the application of various bioremediation approaches for the degradation/removal of pesticides from soil/water matrixes along with the catabolic capacity of microorganisms. Our discussions were expanded further to emphasize identification of specific bacterial communities/strains, such as Bacillus sp. and Pseudomonas sp. This review is expected to provide an overview of the modern biotechnological methodologies along with the associated merits and hurdles for the effective abatement of pesticides.