M. G. Dastidar

Indian Institute of Technology Delhi, New Dilli, NCT, India

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Publications (46)68 Total impact

  • Satish Kumar, G.H.V.C. Chary, M. G. Dastidar
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    ABSTRACT: Coal-oil agglomeration has been a prominent fine coal processing technique, which involves agitation of coal-water slurries in presence of immiscible oil forming coal-oil agglomerates. The present study investigates this technique using Taguchi (L16) design of experiments (DoE) methodology. Further, the process parameters like oil dosage, agitation speed, agglomeration time, pH and temperature were optimized using Analysis of Mean (ANOM) statistical approach and the percentage contribution of each of these parameters towards organic matter recovery (OMR) was determined by Analysis of Variance (ANOVA) statistical approach. The optimum conditions for maximum OMR (91.38%) were identified as oil dosage of 30%, agitation speed of 2500 rpm, agglomeration time of 2 min, pH of 12 and temperature of 30 degrees C. The contribution of each of the above process parameters towards the OMR was found to be in the following order: pH (30.38%) > agitation speed (23.06%) > oil dosage (20.63%) > agglomeration time (13.72%) > temperature (10.61%). Multiple linear regression analysis carried out using SPSS 19.0 ascertained a similar order of influence on the OMR. The highest contribution of suspension pH further establishes the fact that oil agglomeration process is a surface property based technique, as pH affects the surface charge on coal/mineral matter/oil droplets. A mathematical model was also developed using SPSS 19.0 to predict the OMR by oil agglomeration under the given set of experimental conditions. The developed model could predict the OMR to a significant extent, which can be further improved by a DoE technique of higher order.
    Fuel 02/2015; 141. DOI:10.1016/j.fuel.2014.09.119 · 3.41 Impact Factor
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    ABSTRACT: The present study was undertaken to investigate the potential of enriched indigenous sulfur-and-iron-oxidizing microorganisms in the bioleaching of Cu, Ni, Zn and Fe from textile sludges by using elemental sulfur and ferrous sulfate (FS), respectively, as an energy source under batch conditions. The experiments were performed with three different textile sludges (S1, S2 and S3) at initial neutral pH of the sludges procured from different parts of the country i.e., UP, Haryana and Punjab. The three sludges used were not only procured from different parts of the country but also differ in physiochemical characteristics. The extent of heavy metals solubilization in each sludge was found to be different using sulfur- and iron-oxidizing microorganisms. The results of the study indicate that sulfur-oxidizing microorganisms were found more efficient in the bioleaching process, irrespective of any sludge. The use of sulfur-oxidizing microorganisms led to higher solubilization of heavy metals and after 7 days of bioleaching about 84–96% Cu, 64–78% Ni, 81–92% Zn and 74–88% Fe were removed compared to 62–73% Cu, 62–66% Ni, 74–78% Zn and 70–78% Fe using iron-oxidizing microorganisms. This study had shown the feasibility of applying the bioleaching process to textile sludge contaminated with heavy metals. The results of the present study indicate that the bioleached sludge would be safer for land application.
    Geomicrobiology 11/2014; 31(10). DOI:10.1080/01490451.2013.876467 · 1.80 Impact Factor
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    ABSTRACT: Biodiesel production from nonedible feedstocks is gaining attention in the recent years as they do not interfere with the global food economy. In this investigation, Spirulina platensis algae biomass was used as the feedstock for biodiesel production. Single stage extraction–transesterification was carried out with an aim to study the effect of reaction temperature, catalyst concentration, algae biomass to methanol ratio (wt:vol), stirring intensity and algae drying duration on the biodiesel yield. The optimum conditions for maximum biodiesel yield (75 ± 0.40%) were found to be 90 min duration for algae drying, 60% catalyst concentration, 1:4 algae biomass to methanol ratio, 450 rpm stirring intensity and 55 °C reaction temperature. The experimental data appeared to be a good fit with the first order reaction kinetics. For the reaction studied at different temperatures, values of rate constant and activation energy were found out to be 0.001 min−1 and 14518.51 J/mol respectively. The values of thermodynamic parameters such as Gibbs free energy (ΔG), enthalpy of activation (ΔH) and entropy of activation (ΔS) were also determined. The positive values of ΔG and ΔH and negative value of ΔS indicated the unspontaneous and endergonic nature of the reaction.
    Fuel 11/2014; 135:228–234. DOI:10.1016/j.fuel.2014.06.063 · 3.41 Impact Factor
  • G. H. V. C. Chary, Ankush Gupta, M. G. Dastidar
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    ABSTRACT: Coal–oil agglomeration plays a vital role in addressing the ever increasing pollution due to coal utilization apart from minimizing coal-waste generation. Numerous studies were available on coal–oil agglomeration in batch mode; however, the process has been seldom investigated under continuous mode of operation. In the present study, an attempt has been made to examine the coal–oil agglomeration process under continuous mode of operation using high ash power grade coal procured from Jharkhand (India) with Karanja oil as agglomerant. The effectiveness of the process was estimated in terms of organic matter recovery (OMR) and ash rejection (AR). Preliminary experiments were performed under batch mode to optimize the process variables (oil dosage, agitation speed, agglomeration time, and coal particle size). Subsequently, the process was operated in continuous mode under these optimum conditions by varying the reactor residence time. In batch mode, a maximum OMR (78.09%) with significant AR (51.28%) was observed under the following optimized conditions: oil dosage (20% by wt of coal); agitation speed (1,500 rpm); agglomeration time (120 s); and coal particle size (+75–200 µm). However, operation under continuous mode resulted in lower OMR (maximum 47.51%) with higher AR (70.38%), which can be attributed to inadequate contact between coal fines and oil.
    Particulate Science And Technology 10/2014; 33(1):141217135346009. DOI:10.1080/02726351.2014.919549 · 0.48 Impact Factor
  • Kapil Kumar, M.G. Dastidar, T.R. Sreekrishnan
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    ABSTRACT: In search for a cheaper energy source, this study was undertaken to investigate the potential of mixed culture for the decolorization of Methylene blue (MB) and Remazol black B (RBB) using glucose, molasses, and cheese whey as an energy source for microbial growth in aerobic batch reactor. The experiments were performed with synthetic solutions of both the dyes ranging from 25 to 300 mg l−1. The results show that the decolorization and microbial growth was affected by the increase in concentration of dyes leading to the decreased decolorization of dyes. The presence of glucose was found to be more efficient as compared to molasses and cheese whey. After 36 h, mixed culture was able to decolorize MB up to 83, 59, and 54% and RBB up to 80, 58, and 52% in the presence of glucose, molasses, and cheese whey, respectively, at 300 mg l−1 initial dye concentration. The maximum specific uptake was 57, 51, and 52 mg g−1 in presence of glucose, molasses, and cheese whey, respectively, at 300 mg l−1 initial dye concentration of RBB. The maximum specific uptake was 58, 51, and 53 mg g−1 in the presence of glucose, molasses, and cheese whey, respectively, at 300 mg l−1 initial dye concentration of MB. The results of this study shall be useful to develop a suitable decolorization process for the treatment of dye-contaminated wastewater or wastewater contaminated with a variety of dyes.
    Desalination and water treatment 10/2014; 52(34-36). DOI:10.1080/19443994.2013.822333 · 0.99 Impact Factor
  • Arpita Ghosh, Manisha Ghosh Dastidar, T. R. Sreekrishnan
    Journal of Hazardous, Toxic, and Radioactive Waste 10/2014; 18(4):04014022. DOI:10.1061/(ASCE)HZ.2153-5515.0000230
  • Kapil Kumar, M. G. Dastidar, T. R. Sreekrishnan
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    ABSTRACT: The present study was undertaken to investigate the tolerance levels of indigenous sulfur-oxidizing micro-organisms to Methylene blue (MB), Remazol black B (RBB), and mixture of both the dyes (DM) during bioleaching of heavy metals from sewage sludge. The experiments were performed with anaerobically digested sewage sludge at initial neutral pH of the sludge containing 0–35,000 mg/l of the MB, RBB, and DM. The results show that the bioleaching process was affected by the increase in concentration of MB, which decreased the growth of indigenous sulfur-oxidizing micro-organisms leading to the slow rate of decrease in pH and hence decreased solubilization of metals. Similar effects were observed on the activity of indigenous sulfur-oxidizing micro-organisms using RBB and a mixture (DM) of MB and RBB. The presence of RBB and DM were found to be more toxic as compared to MB at the same initial concentration of the dyes. At initial concentration of 30,000 mg/l, a drastic reduction in pH drop was observed with decreased solubilization of metals, irrespective of any dye. The results of the present study shall be useful to develop a suitable bioleaching process for the sludges contaminated with a variety of dyes.
    Desalination and water treatment 09/2014; 52(31-33). DOI:10.1080/19443994.2013.817374 · 0.99 Impact Factor
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    ABSTRACT: This paper reports the role of indigenous iron-oxidizing microorganisms in bioleaching of heavy metals from anaerobically digested sewage sludge in presence of toxic dyes namely, methylene blue (MB), Remazol black B (RBB) and mixture of both the dyes (DM). To achieve this goal, different concentrations of dyes (0, 500, 10000, 15000 and 25000 mg/l) were added to the sewage sludge (initial pH ∼ 7) and subsequently, the solubilization of heavy metals (Cu, Ni, Zn and Cr) was measured at time intervals of 48 hours for 16 days. The results showed that an increase in dye concentration adversely affected the population of indigenous iron-oxidizing microorganisms, thereby decreased the bioleaching of metals. The metal solubilization from sludge is more adversely affected in presence of RBB and DM than MB. In majority of cases, the maximum metal solubilization was recorded at dye concentration of 5,000 mg/l. Two factor analyses (ANOVA) suggests the impact of both factors: dye concentration and dye type on metal leaching rate in sludge system.
    Geomicrobiology 05/2014; DOI:10.1080/01490451.2014.982836 · 1.80 Impact Factor
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    ABSTRACT: The feasibility of biodiesel production from microalgae as third generation biodiesel feedstock was studied in the present investigation. The studies were conducted to evaluate the growth patterns of the algae species i.e. Spirulina, Chlorella and pond water algae. The oil was extracted from the algae biomass and then transesterified. Simultaneous extraction and transesterification were also studied using different solvents. Maximum biodiesel yield was obtained using simultaneous extraction and transesterification using hexane as a solvent. The systematic characterization of algae biomass, algae oil and algae biodiesel was carried out to establish the potential of microalgae for biodiesel production.
    Fuel Processing Technology 04/2014; 120:79–88. DOI:10.1016/j.fuproc.2013.12.003 · 3.02 Impact Factor
  • C. H. Biradar, K.A. Subramanian, M. G. Dastidar
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    ABSTRACT: The work is aimed at conversion of non-edible jatropha curcas de-oiled seed cake (the residue left after extraction of oil from the seed) into bio-oil and bio-char through pyrolysis process. A fluidized bed pyrolysis system with maximum feed rate of 12 g/min was designed and fabricated. The particle size range, sweep gas flow rate and operating temperature were optimized as 0.5 mm–0.99 mm, 8 L/min and 450 °C respectively for obtaining maximum yield of bio-oil (48%) and bio-char (35.1%). The crude bio-oil has lower viscosity (1.98 cSt), higher moisture content (31%) and higher density (1040 kg/m3) as compared to commercial petro-diesel. The crude bio-oil was upgraded to make it suitable for engine application. The moisture content of the crude bio-oil was removed about 3% by weight using Na2SO4 as a reagent. The heavier fractions, tar, moisture and inorganic materials were removed from the crude oil by distillation in the temperature range of 40 °C–80 °C. The density, viscosity and moisture content of the upgraded bio-oil decreased to 1030 kg/m3, 1.77 cSt and 25% respectively.
    Fuel 03/2014; 119:81–89. DOI:10.1016/j.fuel.2013.11.035 · 3.41 Impact Factor
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    ABSTRACT: Adequate information is available on colour and organics removal in batch mode using pure microbial cultures from dye contaminated wastewater. There was a need to develop environment friendly and cost effective treatment technique for actual field conditions. Therefore, the present study was undertaken with an aim to evaluate the potential of acclimatized mixed microbial consortia for the removal of colour and organics from real textile wastewater. Experiments were performed in laboratory scale activated sludge process (ASP) unit under steady state condition varying mixed liquor volatile suspended solids (MLVSS) (2500, 3500 and 5000 mg/l) and hydraulic retention time (HRTs) (18, 24 and 36 h). The results showed that decolourization and chemical oxygen demand (COD) removal increased with increase in MLVSS and HRT. At 18 h HRT, decolourization was found to be 46%, 54% and 67%, which increased to 67, 75 and 90% (36 h HRT) at 2500, 3500 and 5000 mg/l MLVSS respectively. COD removal was found to be 62, 73 and 77% (at 18 h HRT) which increased to 77, 85 and 91% (36 h HRT) at 2000, 3500 and 5000 mg/L MLVSS respectively. On the basis of the results obtained in this study suitable treatment techniques can be developed for the treatment of wastewater contaminated with variety of dyes in continuous mode of operation. This shall have the advantage of treatment of larger quantity of wastewater in shorter duration.
    03/2014; 5. DOI:10.1016/j.wri.2014.01.001
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    ABSTRACT: Pitcher irrigation is particularly useful for horticulture in arid zones. It is of interest to see the correlation of water flow (WF) through the pitcher wall into air, water, and soil with the moisture deficit in air (MD). The pattern of WF into the three media was studied for four pitchers filled with water up to the neck, under natural atmospheric conditions and under hydraulic head (HH). WF without HH was in the order air>soil>water, the amount being negligible in water. WF under HH was also in the same order, but with a significant increase in WF. In all cases WF correlated linearly to level of dryness of the air. Hydraulic conductivity (K-s) for all the pitchers also varied in the order air>soil>water. K-s in water was independent of MD, whereas K-s in soil and air increased with MD. Thus total WF through capillary pores of the pot is due to pressure of hydraulic head only when WF is into the water medium. In air and soil there is an additional WF due to the MD in the medium. This is seen as a negative pressure or an equivalent negative hydraulic head. Copyright (c) 2013 John Wiley & Sons, Ltd.
    Irrigation and Drainage 02/2014; 63(1). DOI:10.1002/ird.1780 · 0.72 Impact Factor
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    ABSTRACT: A comparative study was undertaken using indigenous sulfur-oxidizing microorganisms and iron-oxidizing microorganisms in separate 12 litre continuous stirred tank reactors (CSTRs) for solubilization of heavy metals from anaerobically digested sewage sludge. The CSTRs were operated at hydraulic retention times (HRTs) ranging from 4 to 10 days using sewage sludge feed having near neutral pH. The pH, oxidation-reduction potential (ORP) and solubilization efficiency of metals were found to be highly dependent on HRT and an increase in HRT led to higher solubilization of metals in both the CSTRs. In both the CSTRs, the CSTR operated with sulfur-oxidizing microorganisms at an HRT of 8 days was found to be optimum in solubilizing 58% Cu, 52% Ni, 72% Zn and 43% Cu from the sludge. The nutrient value, nitrogen and phosphorus of bioleached sludge was also conserved (<20% loss) at 8 days HRT. The metals fractionation study conducted using BCR sequential extraction procedure suggested that most of the metals remaining in the bioleached sludge were in the more stable fractions (F3 and F4) and, therefore, can be safely apply as a fertilizer on land.
    Journal of Environmental Science and Health Part A Toxic/Hazardous Substances & Environmental Engineering 01/2014; 49(1):93-100. DOI:10.1080/10934529.2013.824737 · 1.14 Impact Factor
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    ABSTRACT: The present study investigated the changes in nutrient profile of sewage sludge during bioleaching in a batch mode of operation. The study identified the optimum bioleaching period at which maximum solubilisation of metals is achieved while maintaining the fertilising property of the bioleached sludge. The bioleaching experiments were performed using anaerobically digested sewage sludge by employing indigenous iron and sulphur oxidising microorganisms. The results showed that bioleaching using sulphur oxidising microorganisms is comparatively advantageous due to the higher solubilisation of heavy metals. However, despite its high potential in solubilisation of heavy metals from the sludge, the bioleaching process resulted in the undesirable dissolution/loss of sludge bound nutrients (nitrogen and phosphorus), thus making the sludge less attractive for land application as a fertiliser. After 16 days of bioleaching about 45% of the nitrogen and 34% of the phosphorus were leached from the sludge using indigenous iron oxidising microorganisms, whereas about 78% of the nitrogen and 56% of the phosphorus were leached using indigenous sulphur oxidising microorganisms. The findings indicated that the fertilising property of the sewage sludge can be maintained by conducting the process for a shorter duration of time (up to 10 days). The optimum bioleaching period was 10 days where about 85%Cu, 71%Ni, 91%Zn and 61%Cr were solubilised from the sludge while the loss of nitrogen and phosphorus was only 56 and 51% respectively, by using sulphur oxidising microorganisms. The heavy metals remaining in the bioleached sludge were mostly in the residual fraction ensuring the safe disposal of bioleached sludge for land application as a fertiliser.
    Canadian Metallurgical Quarterly 01/2014; 53(1):65-73. DOI:10.1179/1879139513Y.0000000092 · 0.50 Impact Factor
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    ABSTRACT: Experiments were designed to determine the effect of untreated wastewater (T1), phytoremediated wastewater (T2), and rainwater (T3) irrigation on Capsicum annuum and soil. Morphological parameters of plants and accumulation of metal and nutrients in crop and soil were studied. The biomass of C. annuum was greatest under T1 followed by T2 and T3. Root/shoot ratio decreased in the order T3 > T2 > T1 (P ≤ 0.05), indicating lengthening of roots under nutrient stress. There was a significant increase in the nutrient [nitrate (NO3−), phosphate (PO43−), potassium (K+), magnesium (Mg++), and calcium (Ca++)] content of the soil after harvest under T1 and T2. The metal accumulated by the plant in μg g−1 of dry weight was in the order zinc (Zn) > copper (Cu) > chromium (Cr). The percentage accumulations of metals by the plant out of total applied were only 1–5% for Cr and Cu and 14% for Zn, and the remaining was left in the soil. There was no metal accumulation in fruits.
    Communications in Soil Science and Plant Analysis 08/2013; 44(15):1-17. DOI:10.1080/00103624.2013.803565 · 0.42 Impact Factor
  • G.H.V.C. Chary, M. G. Dastidar
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    ABSTRACT: Spherical agglomeration is a size enlargement process in which the disperse medium is held together in aggregates by liquid bridges of an immiscible agglomerating agent in the dispersion medium in general, an aqueous environment. Extensive studies on the process have shown that the process is affected by a number of process parameters. In the present paper, a large number of process parameters such as agitation speed, oil dosage, agglomeration time, coal particle size, slurry pulp density, pH and temperature of the dispersion medium, oil type, surfactant (anionic) use, and sea water usage as pulping medium. affecting the oil agglomeration of Indian bituminous coal procured from North-Eastern region of the country were investigated. Initially, the process parameters were optimized for maximum coal recovery with significant ash rejections. Subsequent experiments to study the effect of surfactant, oil type and sea water usage as pulping medium were performed under the optimized conditions. All the experiments were performed under batch mode of operation. The coal–oil agglomerates were recovered by screening using a standard test sieve whose pore size was same as the maximum size of feed coal particle. The overall agglomeration performance was studied in terms of efficiency index which took into account both combustible recovery and ash rejection, the two important process estimates of the agglomeration process. The experimental results showed that the Indian bituminous coal used in the study was quite receptive to oil agglomeration process and significant recovery of coal fines with considerable ash rejections was possible through this clean coal technology.
    Fuel 04/2013; 106:285–292. DOI:10.1016/j.fuel.2012.12.002 · 3.41 Impact Factor
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  • G.H.V.C. Chary, M. G. Dastidar
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    ABSTRACT: The present study was undertaken to optimize the oil agglomeration process parameters for maximum recovery of coal fines using analysis of mean (ANOM) statistical approach based on the Taguchi parameter design methodology. The various operational parameters considered during the current study were the type of coal, type of oil, coal particle size and pulp density. The study reported a maximum recovery of 91.03% under the following optimum conditions: low ash high sulphur coal, Karanja oil, coal particle size of +75–200 μm and pulp density of 3% (wt./vol.). The percentage contribution of each process parameter towards the agglomerate yield determined using Analysis of Variance (ANOVA) approach was found to be of the following order: coal particle size (55.35%) > type of coal (17.84%) > pulp density (16.50%) > type of oil (8.41%). The most influential process parameter appeared to be coal particle size which has been the primary criteria used for selection of particular process for coal washing. Linear regression analysis carried out using the SPSS 19.0 statistical software further supported the same. Further, a mathematical model was also developed to predict the agglomerate yield by oil agglomeration under the given set of boundary conditions. The experimentally obtained yields were in close agreement with the predicted yield of the model. The agglomerate yield (91.03%) obtained during the confirmation experiment carried out under optimum conditions was much higher than that observed in all the test runs and thereby, the authenticity of optimization was checked.
    Fuel 08/2012; 98:259–264. DOI:10.1016/j.fuel.2012.03.027 · 3.41 Impact Factor
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    ABSTRACT: Domestic wastewater is generated continuously and in large quantities. It can serve as an alternative water nutrient source for irrigation. In the present study Abelmoschus esculentus L. (Ladyfinger) was irrigated using untreated wastewater (T1), treated wastewater (T2) and rainwater (T3) in pot experiments. The effect was seen on nutrient fortication, growth and yield of the plant and the nutrient status of the soil. Additionally the build up of Cr, Cu and Zn from the irrigation water were anlayzed in different parts of the plant biomass and in the soil. The sapling survival rate was found to be 87% in T1 followed by T2 and T3. Root shoot ratio under different treatments was found in the order T3 (0.46) >T2 (0.35) >T1 (0.31). The chlorophyll a, b and carotene content in the leaves (mg g(-1)) was found to be 6.3, 0.5, 0.9 under T1, 4.8, 0.4, 0.8 under T2 and 3.2, 0.3, 0.5 under T3 respectively and all the three varied in the order T1>T2>T3. The same trend was found in case of total dry matter (g) T1 (6.3) >T2 (3.7) >T3 (2.3) at p < or = 0.05. There was a considerable increase in nutrients in the soil under T1 and T2 as compared to T3 after final harvest. The organic matter (%), NO3-N and PO4(3-) (mg kg(-1)) content post harvest soil was found to be 3.4, 71, 90 under T1 and 2.9, 52, 63 under T2 respectively. Also, there was an increase in cations Na, K, Ca and Mg in the soil irrigated with T1 and T2 after the final harvest. Thus irrigation with wastewater generally increased soil fertility. Only a small percentage of the heavy metal was bioaccumulated by the plant parts from the irrigation water. There was hardly any metal accumulation in fruits. Bulk of the metal ions remained in the soil.
    Journal of Environmental Biology 09/2011; 32(5):645-51. · 0.55 Impact Factor
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    Journal of Environmental Biology 01/2011; 32:645-651. · 0.55 Impact Factor