Ackmez Mudhoo
University of Mauritius
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Publication
Featured researches published by Ackmez Mudhoo.
Water Research | 2013
Eveliina Repo; Jolanta Warchoł; Amit Bhatnagar; Ackmez Mudhoo; Mika Sillanpää
Due to the excellent chelating properties of aminopolycarboxylic acid (APCAs), they can be used for the removal of metals from contaminated waters. This paper reviews the research results obtained for both commercial and self-prepared adsorbents functionalized with four most common APCAs: iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), and diethylenetriaminepentaacetic acid (DTPA). The structural characteristics and unique metal binding properties of these chelating adsorbents are presented. The theory of the adsorption phenomena is discussed based on the kinetics of adsorption, equilibrium adsorption isotherm models, and thermodynamic models. The most important applications of APCA-functionalized adsorbents are also described. APCA-functionalized adsorbents are found to be highly promising materials for metal removal from contaminated waters.
Environmental Chemistry Letters | 2012
Ackmez Mudhoo; V.K. Garg; Shaobin Wang
Industrialization and urbanization have resulted in increased releases of toxic heavy metals into the natural environment comprising soils, lakes, rivers, groundwaters and oceans. Research on biosorption of heavy metals has led to the identification of a number of microbial biomass types that are extremely effective in bioconcentrating metals. Biosorption is the binding and concentration of adsorbate from aqueous solutions by certain types of inactive and dead microbial biomass. The novel types of biosorbents presently reviewed are grouped under fungal biomass, biomass of non-living, dried brown marine algae, agricultural wastes and residues, composite chitosan biosorbent prepared by coating chitosan, cellulose-based sorbents and bacterial strains. The reports discussed in this review collectively suggest the promise of biosorption as a novel and green bioremediation technique for heavy metal pollutants from contaminated natural waters and wastewaters.
Critical Reviews in Environmental Science and Technology | 2011
Ackmez Mudhoo; Sanjay K. Sharma; V.K. Garg; Chin-Hsiao Tseng
Arsenic is a toxic element and has been responsible for many accidental, occupational, deliberate, and therapeutic poisonings since its discovery in 1250. It occurs in natural waters as the arsenite (As3+) and arsenate (As5+) ions. The solubility of arsenite and arsenate compounds is relatively high so that these ions are readily transported through aqueous routes into the environment. Arsenic can be transferred from soils to crops and accumulates in various food crops and aquatic plants. The fascinating chemistry and toxicity potential make arsenic and its compounds of particular scientific interest and environmental concern. The conventional removal of heavy metals from wastewater, natural waters, and drinking water has only limited effects on arsenic removal. In this review, the main engineering and medical applications, salient health and environmental concerns, novel research on treatment for arsenic poisoning, and removal technologies for arsenic and their derivatives are discussed and enumerated with a view to pursue valuable applied research in order to protect the environment from arsenic toxicity.
Bioresource Technology | 2016
Gopalakrishnan Kumar; Ackmez Mudhoo; Periyasamy Sivagurunathan; Dillirani Nagarajan; Anish Ghimire; Chyi How Lay; Chiu-Yue Lin; Duu-Jong Lee; Jo Shu Chang
The contribution and insights of the immobilization technology in the recent years with regards to the generation of (bio)hydrogen via dark fermentation have been reviewed. The types of immobilization practices, such as entrapment, encapsulation and adsorption, are discussed. Materials and carriers used for cell immobilization are also comprehensively surveyed. New development of nano-based immobilization and nano-materials has been highlighted pertaining to the specific subject of this review. The microorganisms and the type of carbon sources applied in the dark hydrogen fermentation are also discussed and summarized. In addition, the essential components of process operation and reactor configuration using immobilized microbial cultures in the design of varieties of bioreactors (such as fixed bed reactor, CSTR and UASB) are spotlighted. Finally, suggestions and future directions of this field are provided to assist the development of efficient, economical and sustainable hydrogen production technologies.
Critical Reviews in Biotechnology | 2011
Ackmez Mudhoo; Tânia Forster-Carneiro; Antoni Sánchez
This paper provides an overview of the recent advances and trends in research in the biological production of hydrogen (biohydrogen). Hydrogen from both fossil and renewable biomass resources is a sustainable source of energy that is not limited and of different applications. The most commonly used techniques of biohydrogen production, including direct biophotolysis, indirect biophotolysis, photo-fermentation and dark-fermentation, conventional or “modern” techniques are examined in this review. The main limitations inherent to biochemical reactions for hydrogen production and design are the constraints in reactor configuration which influence biohydrogen production, and these have been identified. Thereafter, physical pretreatments, modifications in the design of reactors, and biochemical and genetic manipulation techniques that are being developed to enhance the overall rates and yields of biohydrogen generation are revisited.
Critical Reviews in Environmental Science and Technology | 2011
Ackmez Mudhoo; Sanjay K. Sharma
In pursuit of a green and sustainable world, wastewater remediation and sludge treatment have equally become a growing global environmental concern. Several innovative treatment processes have been designed throughout the last few decades for treating wastewaters and sludges but many of them are very costly and operate at low efficiencies. In view to find novel treatment processes, active research is being conducted globally. Microwave irradiation technology is gradually making a modest but promising mark of its own in enhancing to significant extents the ease, fastness, and efficiency of certain treatment processes involved in wastewater and sludge management. The authors focus on and appraise the budding use and application of microwave irradiation in chemical research undertaken for sludge and wastewater treatment. The related aspects of microwave-assisted heavy metal stabilization, pathogen inactivation, wastewater parameter analysis, and wastewater treatment polymers synthesis are also discussed.
Green Chemistry Letters and Reviews | 2010
Sanjay K. Sharma; Ackmez Mudhoo; Gargi Jain; Jyoti Sharma
Abstract The corrosion inhibition and adsorption properties of Neem (Azadirachta indica – AZI) mature leaves extract as a green inhibitor of mild steel (MS) corrosion in nitric acid (HNO3) solutions have been studied using a gravimetric technique for experiments conducted at 30 and 60°C. The results disclose that the different concentrations of the AZI extract inhibit MS corrosion and that inhibition efficiency of the extract varies with concentration and temperature. For extract concentrations studied and ranging from 9.09 to 28.57 mg/L, the maximum inhibition efficiency was 80.5 and 80.07% both at 28.57 mg/L AZI at 30 and 60°C, respectively, in 2.0 N HNO3. The adsorption of the inhibitor on the MS surface was exothermic and consistent with the physical adsorption mechanism, best described by the Frumkin adsorption isotherm.
International Journal of Environment and Waste Management | 2008
Romeela Mohee; Ackmez Mudhoo; Geeta Devi Unmar
The co-composting of shredded waste office paper with Broiler Litter (BL) in windrows was analysed in this study. Two compost mixes were monitored for five weeks; Mix 1 comprised 322kg BL, 117 kg shredded paper and 310L water and Mix 2 consisted of 112 kg BL, 265 kg shredded paper and 290 L water. The initial wet moisture content, initial porosity and initial wet bulk density for Mix 1 were 54.6%, 74.7% and 337kg/m?, respectively. The respective parameters for Mix 2 were 48.6%, 87.7% and 185 kg/m?. The initial C:N ratio was kept at 20.8 in both mixes. Peak temperatures recorded for Mix 1 and Mix 2 at day 5 were 71.4?C and 62.7?C, respectively. Temperatures remained above 60?C for more than 10 days in both windrows. The pH for both mixes varied between 7.2 and 8.8. An increase in wet bulk density of 47.6% for Mix 1 and 150% for Mix 2 was obtained. The net decrease in Volatile Solids (VS) was of 57.1% (Mix 1) and 56.3% (Mix 2) at the end of week 5. The respiration rate peaked at 33.7 mg CO2.C/day.gVS on day 3 for Mix 1 and decreased to 0.98 mg CO2.C/day.gVS on day 37. The concentrations of lead, cadmium, total chromium and zinc were 612 mg/kg, 60.8 mg/kg 103.2 mg/kg and 5760 mg/kg, respectively, in the final compost of Mix 1. NPK content of the final compost from Mix 1 was 5-5-10 (dry matter basis) with a level of phosphorous of 20,817 ppm.
Critical Reviews in Biotechnology | 2011
Sunil Kumar; Chart Chiemchaisri; Ackmez Mudhoo
In recent years, due to an advance in knowledge of landfill behaviour and decomposition processes of municipal solid waste, there has been a strong thrust to upgrade existing landfill technologies for optimizing these degradation processes and thereafter harness a maximum of the useful bioavailable matter in the form of higher landfill gas generation rates. Operating landfills as bioreactors for enhancing the stabilization of wastes is one such technology option that has been recently investigated and has already been in use in many countries. A few full-scale implementations of this novel technology are gaining momentum in landfill research and development activities. The publication of bioreactor landfill research has resulted in a wide pool of knowledge and useful engineering data. This review covers leachate recirculation and stabilization, nitrogen transformation and corresponding extensive laboratory- and pilot-scale research, the bioreactor landfill concept, the benefits to be derived from this bioreactor landfill technology, and the design and operational issues and research trends that form the basis of applied landfill research.
Chemosphere | 2017
Rijuta Ganesh Saratale; Chandrasekar Kuppam; Ackmez Mudhoo; Ganesh Dattatraya Saratale; Sivagurunathan Periyasamy; Guangyin Zhen; László Koók; Péter Bakonyi; Nándor Nemestóthy; Gopalakrishnan Kumar
Excess consumption of energy by humans is compounded by environmental pollution, the greenhouse effect and climate change impacts. Current developments in the use of algae for bioenergy production offer several advantages. Algal biomass is hence considered a new bio-material which holds the promise to fulfil the rising demand for energy. Microalgae are used in effluents treatment, bioenergy production, high value added products synthesis and CO2 capture. This review summarizes the potential applications of algae in bioelectrochemically mediated oxidation reactions in fully biotic microbial fuel cells for power generation and removal of unwanted nutrients. In addition, this review highlights the recent developments directed towards developing different types of microalgae MFCs. The different process factors affecting the performance of microalgae MFC system and some technological bottlenecks are also addressed.