Seleem Gaber | National Water Research center (original) (raw)

Papers by Seleem Gaber

Klobex Academic Publishers for Bioscience Study Group, Nov 8, 2011

The removal of heavy metal from sludge before disposal or application to farmland is a necessary ... more The removal of heavy metal from sludge before disposal or application to farmland is a necessary step to achieve a more safe sludge usage or disposal. Chemical extraction using inorganic acids (nitric, hydrochloric) and organic acids (citric, oxalic) were tested for extraction of chromium, copper, nickel, lead and zinc from contaminated sewage sludge at different pH and reaction time. Results revealed that solubilization of metals using inorganic acids achieved its maximum extraction efficiency (Cr-88%, Cu-82%, Ni-86%, Pb-94%, Zn-89%) at pH value lower than 2 and acid contact times of 1hour. while in case of organic acids oxalic acid does not show good results comparing to citric acid that at pH 2.43 citric acid seemed to be highly effective in extracting Cu (86%), Zn(88%), mostly after 1 day of extraction time, Cr (90%), Ni (96%) at 5 days leaching time, while Pb(85%) removal at the same pH was at a longer leaching time 10 days. At pH 3, citric acid seemed to be also highly effective in extracting Cr (66%), Cu(48%), Pb (66%), Zn(69%) at 1 day, while higher removal was also attained for Ni(68%) at only 4 h leaching time. Finally the extraction efficiencies of citric acid for Cr, Cu, Ni, Pb, Zn, are high enough to reduce the heavy metal content in sludge to levels below the legal standards.

This paper presents the development and validation of a GC- FID method for the analysis of some o... more This paper presents the development and validation of a GC- FID method for the analysis of some organochlorine pesticides ( -BHC, -BHC, Heptachlor, Aldrin, Heptachlor epoxide, Dieldrin and Endrin). Validation was done through evaluation of method detection limits (MDL), linearity and recovery. The results show that, The average recoveries obtained for the studied pesticide ranged from 78.67 to 85.1% at fortification levels of 0.25, 1, 2.5 µg/ml, The calculated method detection limits (MDL) were typically in the range 0.089- 0.048 µg/ml, The correlation coefficients (r ) were higher than 0.999 with the linear ranging from 0.1 to 5 µg/ml. 2

The selection of appropriate bacterium species is critical in the successful application of biode... more The selection of appropriate bacterium species is critical in the successful application of biodegradation techniques. The present study is an attempt to isolate and identify new indigenous bacterial strains from a contaminated site in the river Nile water, and to assess their capability to degrade high concentrations of phenanthrene (PHE) as a model for polycyclic aromatic hydrocarbons (PAHs). In order to demonstrate the potential of the isolated bacterial strains in degrading high concentration of PHE, batch reactors were conducted using mineral salt base (MSB) and river Nile water as media, supplemented with 100 mgL -1 PHE as sole carbon and energy

Applied Clay Science, 2011

Arabian Journal of Chemistry, 2020

The degradation process of diazinon one of organophosphorus pesticides was investigated at differ... more The degradation process of diazinon one of organophosphorus pesticides was investigated at different concentrations and incubation periods by fungal species; Rhizopus nodosus (F1), Aspergillus fumigatus (F2) and Penciillium Citreonigum (F3) which were isolated from wastewater. Diazinon residues were quantified at consecutive intervals during incubation period of 21 days in liquid medium inoculated with each fungal species and with control samples. The pesticide and their metabolite were extracted from samples and subsequently the extracts were analyzed by GC/MS. The observed results indicated that F1, F2 and F3 had high ability to degrade diazinon with removal efficiencies 91.1, 76.4 and 72.2% respectively. The studied fungal species F1, F2 and F3were succeeded to reduce the diazinon RL to 7.7, 10.2 and 12.1 days respectively 50 comparing with control sample 87.8 days. 2-Isopropyl-4-methyl-6-hydroxypyrimidine (IMHP) was detected in incubated samples with the three studied fungal str...

Water Science, 2021

An unfortunate thing which is not desirable to happen in testing laboratories is that after worki... more An unfortunate thing which is not desirable to happen in testing laboratories is that after working for weeks on tests, it is discovered that one of the used equipment is not accurate. Therefore, i...

Activated Carbon(AC), produced from agricultural wastes (corncob), was utilized in the adsorption... more Activated Carbon(AC), produced from agricultural wastes (corncob), was utilized in the adsorption of (PAHs) compounds from wastewater. All lab experiments were applied at environmental conditions of atmospheric pressure and temperature of 24±2°C. The impact of adsorbent additive dose, initial PAHs concentration, contact time and pH were the main objectives of this work to know the adsorption efficiency. The obtained results showed that the impact of removal PAHs was achieved after two hours at pH seven with 0.5 g of AC / 500 ml. Increasing the concentration of the adsorbent leads to increase of the PAHs removal up to concentration of 0.5 g adsorbent/L and the adsorption became notably larger with increasing the contact time and initial PAHs concentrations. Another finding was that adsorption and equilibrium conditions well fitted by Freundlich adsorption isotherms (R2~0.9-0.99). The obtained data showed a big direct correlation between adsorption processes and the Freundlich model h...

The aim of this study was to assess and monitor the seasonal variations of physicochemical parame... more The aim of this study was to assess and monitor the seasonal variations of physicochemical parameters (temperature, EC, TS, TDS, TSS, pH, DO, BOD, COD, CO R 3 R , HCO R 3 R El-Menoufia Governorate, Egypt from summer 2012 to spring 2013. Physicochemical characteristics of water varied significantly season to season and the most parameters values were significantly higher during summer at station I. All physicochemical parameters were below the permissible limits except TDS, BOD, COD and NH3 were higher in summer season at all stations. In case of heavy metals, As, Cd, Co, Sb, Se, Sn and V were not detectable (below the detection limits with ICP -OES Cu>Al> Zn>Ni>Pb>Cr>Ba and the highest concentrations of heavy metals were recorded in summer at Station I. The water of El-Bahr El-Pharaony drain is partially polluted with heavy metals so, it is recommended that strict vigilance and constant monitoring are needed to maintain water quality of the drain, which considered ...

Sensing and Bio-Sensing Research

Research Journal of Applied Sciences, Engineering and Technology, 2014

DESALINATION AND WATER TREATMENT

Silver nanoparticles (AgNPs) were successfully fabricated by utilizing AgNO 3 as a metal precurso... more Silver nanoparticles (AgNPs) were successfully fabricated by utilizing AgNO 3 as a metal precursor and aqueous extract of Haplophyllum tuberculatum extract (HTE) as a source of bioreducing and capping agents through controllable microwave irradiation. Influence of different parameters including pH, HTE volume, silver nitrate concentration, incubation time, and temperature were also discussed. The morphological characteristics were investigated using high resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, while the functional groups of bioreducing agents and their efficacy for nanoparticles stabilization were determined using Fourier transform infrared spectroscopy and zeta potential, respectively. Electrochemical behavior of the nanoparticles was studied using cyclic voltammetry (CV) while the optical features were determined using ultraviolet-visible and fluorescence emission spectroscopy. The results indicated that the nanoparticles are semispherical with an average size of 40 nm. These particles have considerable stability confirmed by zeta potential value (-45 mV) and also electrochemically detected at 424 mV. On the other hand, the nanoparticles showed antibacterial activity against total and fecal coliform bacteria. Also, the antibacterial activity of biosynthesized AgNPs against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Klebsiella pneumoniae was evaluated. Overall, our biosynthesized AgNPs could be used in developing the treatment techniques of wastewater.

Klobex Academic Publishers for Bioscience Study Group, Nov 8, 2011

The removal of heavy metal from sludge before disposal or application to farmland is a necessary ... more The removal of heavy metal from sludge before disposal or application to farmland is a necessary step to achieve a more safe sludge usage or disposal. Chemical extraction using inorganic acids (nitric, hydrochloric) and organic acids (citric, oxalic) were tested for extraction of chromium, copper, nickel, lead and zinc from contaminated sewage sludge at different pH and reaction time. Results revealed that solubilization of metals using inorganic acids achieved its maximum extraction efficiency (Cr-88%, Cu-82%, Ni-86%, Pb-94%, Zn-89%) at pH value lower than 2 and acid contact times of 1hour. while in case of organic acids oxalic acid does not show good results comparing to citric acid that at pH 2.43 citric acid seemed to be highly effective in extracting Cu (86%), Zn(88%), mostly after 1 day of extraction time, Cr (90%), Ni (96%) at 5 days leaching time, while Pb(85%) removal at the same pH was at a longer leaching time 10 days. At pH 3, citric acid seemed to be also highly effective in extracting Cr (66%), Cu(48%), Pb (66%), Zn(69%) at 1 day, while higher removal was also attained for Ni(68%) at only 4 h leaching time. Finally the extraction efficiencies of citric acid for Cr, Cu, Ni, Pb, Zn, are high enough to reduce the heavy metal content in sludge to levels below the legal standards.

This paper presents the development and validation of a GC- FID method for the analysis of some o... more This paper presents the development and validation of a GC- FID method for the analysis of some organochlorine pesticides ( -BHC, -BHC, Heptachlor, Aldrin, Heptachlor epoxide, Dieldrin and Endrin). Validation was done through evaluation of method detection limits (MDL), linearity and recovery. The results show that, The average recoveries obtained for the studied pesticide ranged from 78.67 to 85.1% at fortification levels of 0.25, 1, 2.5 µg/ml, The calculated method detection limits (MDL) were typically in the range 0.089- 0.048 µg/ml, The correlation coefficients (r ) were higher than 0.999 with the linear ranging from 0.1 to 5 µg/ml. 2

The selection of appropriate bacterium species is critical in the successful application of biode... more The selection of appropriate bacterium species is critical in the successful application of biodegradation techniques. The present study is an attempt to isolate and identify new indigenous bacterial strains from a contaminated site in the river Nile water, and to assess their capability to degrade high concentrations of phenanthrene (PHE) as a model for polycyclic aromatic hydrocarbons (PAHs). In order to demonstrate the potential of the isolated bacterial strains in degrading high concentration of PHE, batch reactors were conducted using mineral salt base (MSB) and river Nile water as media, supplemented with 100 mgL -1 PHE as sole carbon and energy

Applied Clay Science, 2011

Arabian Journal of Chemistry, 2020

The degradation process of diazinon one of organophosphorus pesticides was investigated at differ... more The degradation process of diazinon one of organophosphorus pesticides was investigated at different concentrations and incubation periods by fungal species; Rhizopus nodosus (F1), Aspergillus fumigatus (F2) and Penciillium Citreonigum (F3) which were isolated from wastewater. Diazinon residues were quantified at consecutive intervals during incubation period of 21 days in liquid medium inoculated with each fungal species and with control samples. The pesticide and their metabolite were extracted from samples and subsequently the extracts were analyzed by GC/MS. The observed results indicated that F1, F2 and F3 had high ability to degrade diazinon with removal efficiencies 91.1, 76.4 and 72.2% respectively. The studied fungal species F1, F2 and F3were succeeded to reduce the diazinon RL to 7.7, 10.2 and 12.1 days respectively 50 comparing with control sample 87.8 days. 2-Isopropyl-4-methyl-6-hydroxypyrimidine (IMHP) was detected in incubated samples with the three studied fungal str...

Water Science, 2021

An unfortunate thing which is not desirable to happen in testing laboratories is that after worki... more An unfortunate thing which is not desirable to happen in testing laboratories is that after working for weeks on tests, it is discovered that one of the used equipment is not accurate. Therefore, i...

Activated Carbon(AC), produced from agricultural wastes (corncob), was utilized in the adsorption... more Activated Carbon(AC), produced from agricultural wastes (corncob), was utilized in the adsorption of (PAHs) compounds from wastewater. All lab experiments were applied at environmental conditions of atmospheric pressure and temperature of 24±2°C. The impact of adsorbent additive dose, initial PAHs concentration, contact time and pH were the main objectives of this work to know the adsorption efficiency. The obtained results showed that the impact of removal PAHs was achieved after two hours at pH seven with 0.5 g of AC / 500 ml. Increasing the concentration of the adsorbent leads to increase of the PAHs removal up to concentration of 0.5 g adsorbent/L and the adsorption became notably larger with increasing the contact time and initial PAHs concentrations. Another finding was that adsorption and equilibrium conditions well fitted by Freundlich adsorption isotherms (R2~0.9-0.99). The obtained data showed a big direct correlation between adsorption processes and the Freundlich model h...

The aim of this study was to assess and monitor the seasonal variations of physicochemical parame... more The aim of this study was to assess and monitor the seasonal variations of physicochemical parameters (temperature, EC, TS, TDS, TSS, pH, DO, BOD, COD, CO R 3 R , HCO R 3 R El-Menoufia Governorate, Egypt from summer 2012 to spring 2013. Physicochemical characteristics of water varied significantly season to season and the most parameters values were significantly higher during summer at station I. All physicochemical parameters were below the permissible limits except TDS, BOD, COD and NH3 were higher in summer season at all stations. In case of heavy metals, As, Cd, Co, Sb, Se, Sn and V were not detectable (below the detection limits with ICP -OES Cu>Al> Zn>Ni>Pb>Cr>Ba and the highest concentrations of heavy metals were recorded in summer at Station I. The water of El-Bahr El-Pharaony drain is partially polluted with heavy metals so, it is recommended that strict vigilance and constant monitoring are needed to maintain water quality of the drain, which considered ...

Sensing and Bio-Sensing Research

Research Journal of Applied Sciences, Engineering and Technology, 2014

DESALINATION AND WATER TREATMENT

Silver nanoparticles (AgNPs) were successfully fabricated by utilizing AgNO 3 as a metal precurso... more Silver nanoparticles (AgNPs) were successfully fabricated by utilizing AgNO 3 as a metal precursor and aqueous extract of Haplophyllum tuberculatum extract (HTE) as a source of bioreducing and capping agents through controllable microwave irradiation. Influence of different parameters including pH, HTE volume, silver nitrate concentration, incubation time, and temperature were also discussed. The morphological characteristics were investigated using high resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, while the functional groups of bioreducing agents and their efficacy for nanoparticles stabilization were determined using Fourier transform infrared spectroscopy and zeta potential, respectively. Electrochemical behavior of the nanoparticles was studied using cyclic voltammetry (CV) while the optical features were determined using ultraviolet-visible and fluorescence emission spectroscopy. The results indicated that the nanoparticles are semispherical with an average size of 40 nm. These particles have considerable stability confirmed by zeta potential value (-45 mV) and also electrochemically detected at 424 mV. On the other hand, the nanoparticles showed antibacterial activity against total and fecal coliform bacteria. Also, the antibacterial activity of biosynthesized AgNPs against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Klebsiella pneumoniae was evaluated. Overall, our biosynthesized AgNPs could be used in developing the treatment techniques of wastewater.