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Articles by M. Verma
Total Records ( 6 ) for M. Verma
  A. E. Ghaly , H. A. Farag and M. Verma
  A hydroponic system was developed and used for purification of an anaerobically treated dairy manure and production of forage crops. The effect of light duration, seeding rate and wastewater application rate on the crop yield and pollution potential reduction were studied. The results indicated that a wheat forage crop can be produced in 21 days from germination to harvest in this system and removal efficiencies of up to 89.9, 94.6, and 86.7 % can be achieved for the total solids, chemical oxygen demand (COD) and ammonium nitrogen, respectively. Increasing the wastewater application rate increased the crop yield and decreased the pollutants removal efficiencies. A treatment combination of wastewater application rate of 900 mL/day, a seeding rate of 400 g and a light duration of 12 hours gave the best results for crop yield (3.65 kg of wheat/tray). A total possible yield of 3160 tonnes per hectare per year can be achieved with the system (with thirteen harvests per year). This is more than 98 times greater than the yield obtainable from a field grown conventional forage of 245 tonnes per hectare per year. At the optimum forage production, removal efficiencies of 75.7, 85.9 and 75.6% were achieved for the solids, COD, ammonium nitrogen, respectively. A nitrate nitrogen concentration of 6.7 mg/L was found in the effluent from the hydroponic system. This is below the Canadian Environmental and Health Guidelines of 10 mg/L.
  M. Verma and A.E. Ghaly
  Advanced oxidation processes involving TiO2/UV and H2O2/UV were evaluated for their potential use in decolorization of textile dye effluents. A coil photo reactor, consisting of UV radiation source and a spiral coil coated with TiO2, was used to treat synthetic effluent of Remazol Brilliant Blue dye. The TiO2 coating was performed using the sol-gel technique. The effects of UV radiation, TiO2 coatings and dye concentration were studied and the results were compared to dye treatment involving H2O2. The maximum dye removal efficiencies were 7.3, 12.2 and 12.5% for uncoated, single coat and dual coat of TiO2, respectively. The decolorization efficiency was inversely related to dye concentration of the effluent. The treatments with UV only, TiO2 only, UV+TiO2, H2O2 only and UV+H2O2 resulted in color reduction of 7.6, 2.3, 12.5, 4.1 and 99.9% respectively. The maximum decolorization occurred in ≤ 100 min in all cases. The temperature varied from 29.2-54.7°C for UV+TiO2 treatment and no change in reactor temperature was observed when UV was not used.
  C. Galbrand , I. G. Lemieux , A. E. Ghaly , R. Cote and M. Verma
  A surface flow constructed wetland was used for the treatment of landfill leachate and industrial park runoff. The wetland consisted of seven cells and was designed as a kidney shape to facilitate high retention time. The water quality was assessed for iron, manganese, phosphorus (orthophosphate), pH, dissolved oxygen (DO), nitrogen (ammonia, nitrate, nitrite and TKN), chemical oxygen demand (COD), total suspended solids (TSS) and total dissolved solids (TDS). The water quality parameters were measured at inlet, cell 1 (unvegetated area), cell 2, cell 3 and outlet to determine progress in treatment efficiency as water flow through the wetland. The reductions in iron, manganese, ammonia and TKN were 24.2 %, 6.7 %, 37 % and 5.9 %, respectively. The concentrations of nitrite, nitrate and DO were within the Canadian guidelines for the protection of aquatic animals. Increases in COD, TSS and TDS concentrations of 11.8 %, 5.2 % and 7.5 %, were observed at outlet mainly due to immature vegetation and underdeveloped biodiversity.
  A.E. Ghaly and M. Verma
  A flushing process followed by a zeolite based ion-exchange process were developed for the treatment of saline sludges from oil and gas exploration sites. The particle size distribution of sludge sample indicated the presence of very fine sand and clay. The electrical conductivity of the sludge was 42.2 dS m-1 indicating very saline sludge and the Cation Exchange Capacity (CEC) was 40 cmoL kg-1 which was very suitable for ion-exchange process. A 500 g sample of saline sludge (containing CaCl2:MgCl2:NaCl ratio as 1:1.16:36.61) was washed using demineralized water in a mixed reactor and the sludge was allowed to settle for 36 h. The optimal number of washes was determined to be two washes with an overall salt removal efficiency of 94.47%. The treated sludge contained 515 mg salt kg-1 sludge (or 0.05% w w-1) and was suitable for agricultural application. The washwater was passed through a Mountain Stronach zeolite (chabazite) based ion-exchange column for salt reduction. The sodium salt removal efficiency was 75.34%. This was increased to 99.79% when using two ion-exchange columns. The Ca and Mg ions were under regulatory limits and required no further treatment. The final salt concentration in the wash water was 314.0 mg L-1 which was below the limits established by the Canadian Guidelines. For complete removal of total salts, a series of ion-exchange columns with different zeolites (for removal of NaCl, MgCl2 and CaCl2) will be required.
  P. Mishra , M. Verma , V. Mishra , S. Mishra and G.K. Rai
  Amla fruit can range upto 950 mg/100 g which is said to be highest among all fruits next only to Barbados cherry. Being very astringent in taste it can not be consumed as raw by the consumer hence processing became essential. Present study was an effort to develop commercially acceptable ready to eat green Amla chutney. To optimize the quantity of pulps and salts to be added, Response Surface Methodology (RSM) was used. Statistical software Stat-Ease was used for statistical and graphical analysis of the experimental data. To consider all the responses simultaneously for optimization the RSM was used to compromise optimum conditions and it was found that the sensory scores were 7.35, 7.8 and 7.75 for color, flavor and overall acceptability corresponding to optimum conditions. Chutney having composition Amla pulp-65.59%, salt -8%, green chilli-3.31%, garlic paste-2.11% and coriander leave paste 18.89% was found optimum. Triplicates samples were prepared using the optimum conditions and were evaluated for all the responses, corresponding values for color flavor and overall acceptability were 7.91, 8.08 and 8.08 which were comparatively higher than the predicted value. Therefore, the said formulations were recommended for ready to eat chutney. For the preservation of Amla chutney, salt concentration was varied from 8 to 12% while Brix were varied from 20 to 50°B. REC having 25°B had only 10 days of shelf life while chutney of 35°B could be stored upto twenty days at refrigeration temperature. Chutney having 50°B could be stored up to two months without any significant change in the quality attributes of the chutney.
  M.G. Vashist , S. Deswal , M. Verma and S. Kharb
  Deep Vein Thrombosis (DVT) affects a significant proportion of population and if untreated timely leads to high mortality due to pulmonary embolism. Though color Doppler ultrasonography is the gold standard for diagnosis but non availability of experienced radiologist especially at night has led to alternative investigation for diagnosis of DVT. Plasma D-dimer levels which measure the degradation products of cross linked fibrin, are a valuable diagnostic test for the exclusion of deep venous thrombosis. D-dimer levels were analyzed in fifty patients suspected of deep vein thrombosis clinically and compared the results with color Doppler ultrasonography. A value of 250 ng mL-1 was chosen as cut off. For the purposes of analysis, results were expressed as either negative (<250 ng mL-1) or positive (≥250 ng mL-1). Patients were classified as low, moderate or high pretest probability for DVT as per Well ’s scoring system. D-dimer assay had a sensitivity of 97.3% (CI 85.8-99.9%), a specificity of 38.5% (CI 13.9-68.4%), a positive predictive value of 81.8% (CI 67.3-91.8%) and a negative predictive value of 83.3% (CI 35.9-99.6%). In patients with a low or moderate pretest probability of DVT, the negative predictive value of this assay was 100% and this test can safely exclude the DVT in these patients. Thus in patients having low and moderate pretest probability automated latex D-dimer test can safely exclude DVT.
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