Haris Nalakath

Haris Nalakath

PhD

About

32
Publications
8,737
Reads
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1,201
Citations
Citations since 2017
18 Research Items
1041 Citations
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2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Additional affiliations
October 2019 - November 2019
University of A Coruña
Position
  • Researcher
June 2018 - present
University of A Coruña
Position
  • PostDoc Position
August 2016 - June 2018
Ege University
Position
  • PostDoc Position
Education
June 2007 - June 2009
Karunya University
Field of study
  • Biotechnology
June 2002 - June 2006
University of Calicut
Field of study
  • Biotechnology

Publications

Publications (32)
Article
Full-text available
Microbial C1 gas conversion technologies have developed into a potentially promising technology for converting waste gases (CO2, CO) into chemicals, fuels, and other materials. However , the mass transfer constraint of these poorly soluble substrates to microorganisms is an important challenge to maximize the efficiencies of the processes. These te...
Article
Simultaneous pollutant removal and electricity production using microbial fuel cells is a promising environmental sustainable technology that contributes to the circular economy. Numerous studies have been conducted previously using exogenously adding easily degradable sugars for electricity generation in microbial fuel cells (MFCs). However, in re...
Article
Full-text available
The impetus to predicting future biomass consumption focuses on sustainable energy, which concerns the non-renewable nature of fossil fuels and the environmental challenges associated with fossil fuel burning. However, the production of rice residue in the form of rice husk (RH) and rice straw (RS) has brought an array of benefits, including its ut...
Article
Air pollution is a topic of important global concern because it has contributed significantly to an increase in the earth's global warming potential and contributed to severe health and environmental impacts. In this review, the different bioreactor configurations commonly used for waste gas treatment, namely the biofilters, the biotrickling filter...
Article
Microbial fuel Cells (MFCs) are an emerging technology for converting organic waste into electricity, thus providing potential solution to energy crises along with eco-friendly wastewater treatment. The electrode properties and biocatalysts are the major factors affecting electricity production in MFC. The electrons generated during microbial metab...
Article
Full-text available
Syngas fermentation via the Wood-Ljungdahl (WL) pathway is a promising approach for converting gaseous pollutants (CO and CO2) into high-value commodities. Because the WL involves several enzymes with trace metal components, it requires an adequate supply of micronutrients in the fermentation medium for targeted bioprocessing such as bioethanol pro...
Article
The ethanol production capability of Clostridium aceticum was investigated and optimized, in order to evaluate the ability of that organism to produce high concentrations of fuel-ethanol. The results showed that C. aceticum can produce significant amounts of ethanol when a natural pH drop occurs in the fermentation broth as a consequence of acetic...
Chapter
Gaseous substrates or waste gases can be either biodegraded into innocuous end products or they can otherwise be transformed into high added-value commercial products. In the case of waste gases, the former alternative is still the common choice at full-scale, although recent progress has been made in the development and optimization of (waste)gas...
Chapter
Production of biofuels and bioproducts from syngas or industrial waste gases, containing C1 compounds such as CO and CO2, is a promising alternative to the technologies used in conventional chemical industries and refineries. Various parameters and strategies that can improve the production process are addressed, focusing mainly on bioethanol. The...
Article
Full-text available
Fermentative hydrogen production from fruit and vegetable wastes (FVWs) through Dry Fermentation Technology (DFT) was studied through three independent experiments in order to find out the effect of particle size and autoclaving pretreatment on bio-hydrogen production from FVWs and as follows: (1) autoclaved FVWs with sizes < 5 cm (experiment I); (...
Chapter
Abstract This chapter focuses on biohydrogen production from solid wastes. In particular, the waste (organic fraction of municipal solid wastes, forestry wastes, agricultural wastes, industrial wastes, livestock, etc.) that can be used for biohydrogen production and the proper pre-treatment methods (physical methods such as mechanical, irradiation;...
Article
Organic solid wastes are the most abundant sources for biohydrogen production. Dry fermentation system has many advantages over continuously fed reactor systems for treatment of organic solid wastes. In this study the effect of percolation frequency on yield of biohydrogen production from fruit and vegetable wastes using dry fermentation system was...
Article
Dark fermentative hydrogen production from organic waste is an attractive technique that simultaneously treats waste along with generation of renewable fuel. In this study, a relative new technology named dark dry fermentation was tested in a 55-L reactor to treat fruit and vegetable waste (FVW) along with simultaneous generation of biohydrogen. To...
Article
Full-text available
Trace elements are one of the important parameters for dark fermentative H2 production because they work as co-factors in H2 formation biochemistry. Lack or excess of trace element and its concentrations could be an important reason for the low yield of H2 production. In this study, the effects of 11 different trace elements (Fe, Ni, Zn, Co, Cu, Mn...
Article
A two-stage continuous system with two stirred tank reactors in series was utilized to perform syngas fermentation using Clostridium carboxidivorans. The first bioreactor (bioreactor 1) was maintained at pH 6 to promote acidogenesis and the second one (bioreactor 2) at pH 5 to stimulate solventogenesis. Both reactors were operated in continuous mod...
Article
Syngas bioconversion is a promising method for bioethanol production, but some VFA remains at the end of fermentation. A two-stage process was set-up, including syngas fermentation as first stage under strict anaerobic conditions using C. autoethanogenum as inoculum, with syngas (CO/CO2/H2/N2, 30/10/20/40) as gaseous substrate. The second stage con...
Article
Full-text available
Bioprocesses in conventional second generation biorefineries are mainly based on the fermentation of sugars obtained from lignocellulosic biomass or agro-industrial wastes. An alternative to this process consists in gasifying those same feedstocks or even other carbon-containing materials to obtain syngas which can also be fermented by some anaerob...
Chapter
The emission of volatile pollutants to the atmosphere and air pollution have become a major concern. Volatile pollutants are emitted from either stationary sources or mobiles sources. Common air pollutants are particulate matter as well as volatile organic and inorganic compounds. Different technologies can be used for their removal, including biop...
Article
Ethanol production from C1 compounds, such as carbon monoxide, using acetogenic bacteria is an attractive alternative to produce renewable fuels. However, the process is generally associated with acetic acid accumulation, which is often produced in larger quantities than ethanol itself. This study shows the continuous production of ethanol and comp...
Article
Full-text available
Butanol production from carbon monoxide-rich waste gases or syngas is an attractive novel alternative to the conventional acetone-butanol-ethanol (ABE) fermentation. Solvent toxicity is a key factor reported in ABE fermentation with carbohydrates as substrates. However, in the gas-fermentation process, kinetic aspects and the inhibition effect of s...
Article
Full-text available
The fermentation of waste gases rich in carbon monoxide using acetogens is an efficient way to obtain valuable biofuels like ethanol and butanol. Different experiments were carried out with the bacterial species Clostridium carboxidivorans as biocatalyst. In batch assays with no pH regulation, after complete substrate exhaustion, acetic acid, butyr...
Article
Fermentation medium and fermentation pH are among the main parameters that control acidogenesis and solventogenesis in clostridia during CO bioconversion. The approach of cyclic pH shifts from high (pH 5.75) to low (pH 4.75) levels, in continuous gas-fed bioreactors, allowed Clostridium autoethanogenum to consume and convert CO and the produced ace...
Patent
Full-text available
La presente invención describe un bioproceso que permite la producción de bioetanol sin ninguna acumulación de ácido acético al final del proceso de bioconversión. El sustrato utilizado en la bioconversión contiene monóxido de carbono alimentado en continuo a un biorreactor. La conversión del sustrato en etanol, en ausencia de ácido acético al fina...
Article
The environmental problems associated to the use of fossil fuels as well as their expected scarcity in the near future requires to search for new alternative fuels produced from renewable sources. Bioethanol is a biofuel that can be obtained from biomass and waste as feedstocks through fermentation. Two major routes allow to convert the feedstocks...
Article
Fermentation of CO or syngas offers an attractive route to produce bioethanol. However, during the bioconversion, one of the challenges to overcome is to reduce the production of acetic acid in order to minimize recovery costs. Different experiments were done with Clostridium autoethanogenum. With the addition of 0.75 μM tungsten, ethanol productio...
Article
Full-text available
The effect of different sources of nitrogen as well as their concentrations on the bioconversion of carbon monoxide to metabolic products such as acetic acid and ethanol by Clostridium autoethanogenum was studied. In a first set of assays, under batch conditions, either NH4Cl, trypticase soy broth or yeast extract (YE) were used as sources of nitro...
Chapter
Production of bioethanol from cellulosic biomass plays an important role to support energy policies. To produce cellulosic ethanol via fermentation it is required to first break the lignocellulosic complex. Numerous technologies for such pretreatment are under development or in a pilot plant stage. Saccharomyces cerevisiae or other microorganisms a...
Chapter
Major air pollutants that can be degraded biologically include both volatile organic as wellas inorganic compounds. Bioprocesses are not suitable for the removal of particle matter. The biodegradation routes depend on the nature of the pollutants. End-products are generally water and carbon dioxide under aerobic conditions, but other products may a...
Chapter
Benzene is a well known industrial solvent, and a very important raw material for the manufacture of a large number of chemicals (fine and intermediates). Due to their high volatilization potential, benzene vapours can frequently enter into the ambient environment through improper disposal practices, refining activities, leakage during storage and...
Article
Bioconversion of syngas/waste gas components to produce ethanol appears to be a promising alternative compared to the existing chemical techniques. Recently, several laboratory-scale studies have demonstrated the use of acetogens that have the ability to convert various syngas components (CO, CO2, and H-2) to multicarbon compounds, such as acetate,...

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Projects

Projects (4)
Project
Gas fermentation is a microbial process that contributes to the fullfilement of the sustainable development goals (SDGs) of the United Nations. The process converts waste and greenhouse gases into commodity chemicals and fuels. Thus, world’s climate is positively affected. This project aims to collect the essays by stakeholders from science, business and society and to make them available to the community. If you want to collobarate on this project don't hesitate to contacted us and we add you to the list of collobarators.
Project
The 8th International Conference on Biotechniques for Air Pollution Control and Bioenergy(Biotechniques-2019) will be held at the National University of Ireland, on August 28 – 30, 2019. Biotechniques-2019 covers a wide range of topics related to the application of environmental biotechnology for air pollution control, greenhouse gas mitigation, gas fermentation in bioreactors and clean (bio)fuels production and upgrading, among others. The conference opens new doors to academic and industrial partners in order to facilitate research cooperation between academia and industry, potentially allowing commercialization of innovative bioprocesses. For more information: http://bioengingroup.es/biotechniques-2019/
Project
this project will optimize syngas fermentation conditions and compare two new immobilized reactor configurations in terms of ethanol production performance. The conversion of CO-containing components causing air pollution into bioethanol using biological processes will contribute to the elimination of an element that negatively affects the environment and human health. The improvement of our national economy will bring a new beneficial approach with this new clean biofuel.