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Thabet WM, Moneer AA, Abdelwahab O, Ahdy HHH, Khedawy M, Shabaan NA. Ecological risk assessment of metal pollution in the surface sediments of delta region, Egypt. Environ Monit Assess 2024; 196:351. [PMID: 38462575 PMCID: PMC10925576 DOI: 10.1007/s10661-024-12481-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 02/17/2024] [Indexed: 03/12/2024]
Abstract
The surface sediments from eleven sectors perpendicular to the Egyptian Mediterranean Sea coast, along the delta region, have been assessed. These sectors cover areas of Eastern Harbour, Abu Qir Bay, Rosetta, Abo Khashaba, Burullus, Baltim, Damietta, and Manzala. The assessment process is based on determining the eight metals' (Fe, Cu, Zn, Mn, Ni, Co, Pb, and Cd) content, followed by applying different pollution and ecological risk indices such as enrichment factor (EF), geoaccumulation factor (Igeo), contamination factor (CF), Pollution Load Index (PLI), degree of contamination (Cdeg.), Nemerow Integrated Pollution Index (NIPI), and Potential Ecological Risk Index (PERI). The results indicate the average concentrations of metals (μg/g) were Fe (18,000), Mn (213), Zn (120), Ni (26), Co (13), Cu (12), Pb (10), and Cd (2). The single-pollution indices reveal that most metals were depleted to metal levels, the sediments were moderately polluted with Cd and unpolluted with other metals, and the CF values confirmed that the sediments were highly polluted with Cd and low contaminated with the rest of the metals. According to the integrated pollution indices, the Eastern Harbour, Damietta, Manzalah, and Bardawil (eastern Inlet) are the most polluted sectors relative to the rest, subjected to various point sources of pollution. Drainage management system is recommended to enhance water conservation and improve fish stocks.
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Affiliation(s)
- Walaa M Thabet
- Marine Pollution Lab, Marine Environment Division, National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt.
| | - Abeer A Moneer
- Marine Pollution Lab, Marine Environment Division, National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Ola Abdelwahab
- Marine Pollution Lab, Marine Environment Division, National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Hoda H H Ahdy
- Marine Pollution Lab, Marine Environment Division, National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Mohamed Khedawy
- Marine Pollution Lab, Marine Environment Division, National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Nashwa A Shabaan
- Oceanography Department, Faculty of Science, Alexandria University, Alexandria, Egypt
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Mandor H, Amin NK, Abdelwahab O, El-Ashtoukhy ESZ. Preparation and characterization of N-doped ZnO and N-doped TiO 2 beads for photocatalytic degradation of phenol and ammonia. Environ Sci Pollut Res Int 2022; 29:56845-56862. [PMID: 35347620 PMCID: PMC9374654 DOI: 10.1007/s11356-022-19421-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
N-doped ZnO beads (NZB) and N-doped TiO2 beads (NTB) were synthesized via a modified sol-gel technique utilizing chitosan (CS)/polyvinyl alcohol (PVA) hydrogel beads as basic support for photocatalyst. Urea was used as a source of nitrogen in the preparation of N-doped ZnO beads, while ammonium acetate, CH3COONH4, was used as a nitrogen source in the production of N-doped TiO2 beads. The characteristics of synthesized beads were identified by scanning electron microscope (SEM), X-ray photoelectron spectroscopy analysis (XPS), X-ray diffraction (XRD), N2 adsorption-desorption isotherms, BET surface area, Fourier transform infrared (FT-IR) measurements, and diffuse reflectance spectroscopy (DRS) studies. The use of the nitrogen doping method for photocatalyst was performed to adjust the bandgap and electrical properties of ZnO and TiO2 by establishing acceptor defects. NZB and NTB with the intrinsic donor defect of oxygen vacancy and the nitrogen-to-oxygen acceptor defect could be activated by a less-energy UV consumption for efficient pollutant degradation. The results indicated that the as-synthesized NZB achieved much higher degradation activity than NTB, commercial ZnO, and TiO2 in the decomposition of a binary mixture composed of ammonia and phenol under UV light irradiation.
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Affiliation(s)
- Hagar Mandor
- Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt
| | - Nevine K Amin
- Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt
| | - Ola Abdelwahab
- National Institute of Oceanography and Fisheries, NIOF, Alexandria, Egypt.
| | - El-Sayed Z El-Ashtoukhy
- Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt
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Gaballah MS, Abdelwahab O, Barakat KM, Stefanakis AI. A pilot system integrating a settling technique and a horizontal subsurface flow constructed wetland for the treatment of polluted lake water. Chemosphere 2022; 295:133844. [PMID: 35120961 DOI: 10.1016/j.chemosphere.2022.133844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 01/18/2022] [Accepted: 01/31/2022] [Indexed: 06/14/2023]
Abstract
An integrated system was tested at pilot-scale for treating polluted water from the Marriot Lake in Egypt, comprising a settling technique followed by three parallel horizontal subsurface flow constructed wetland (HFCWs) units operating under a continuous flow mode; one HFCW unit was planted with Typha angustifolia and contained a perforated pipes network for enhanced passive aeration (CWA), one unit was planted without the perforated pipe network (CWR) and one served as a Control unit (unplanted and without perforated pipes). Changes in physicochemical parameters, BOD5, nutrients (nitrogen, phosphorus), microbial community, and trace metals at different hydraulic retention times (HRT; 0.5-6 h) and hydraulic loading rates (HLR; 750, 1000, 1250, and 2000 L/m2/d) were monitored. The CWA unit had an overall better performance than the CWR unit, while both planted units outperformed the Control unit. CWA showed the highest performance at HLR of 1000 L/m2/d and 4-6 h-HRT with 95.3% removal for turbidity, 83% for BOD5, 99.3% for ammonia nitrogen (NH4-N), 70.8% for Total Nitrogen (TN), and 66.7% for Total Phosphorus (TP), while higher NO3-N and NO2-N effluent concentrations were observed. Trace metals levels were significantly reduced and accumulated in plant tissues. Microbial communities' densities fluctuated in the CWA unit. The integrated system with the settling stage and the planted CWA unit was proved to achieve a high removal efficiency and reached the national discharge limits, thus representing a novel nature-based solution for the sustainable remediation of polluted lake water.
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Affiliation(s)
- Mohamed S Gaballah
- National Institute of Oceanography and Fisheries, NIOF, Egypt; College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, 100083, People's Republic of China.
| | - Ola Abdelwahab
- National Institute of Oceanography and Fisheries, NIOF, Egypt.
| | | | - Alexandros I Stefanakis
- Laboratory of Environmental Engineering and Management, School of Chemical and Environmental Engineering, Technical University of Crete, Chania, 73100, Greece.
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Hamad HA, Abd Elhafez S, Sorour M, Amin N, Abdelwahab O, El-Ashtoukhy E. Fabrication and Characterization of Functionalized Lignin-Based Adsorbent Prepared from Black Liquor in the Paper Industry for Superior Removal of Toxic Dye. SSRN Journal 2022. [DOI: 10.2139/ssrn.4028735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Yusuh M, Lau L, Abdelwahab O, Garba K, Sirikhansaeng P, Birch B, Lwaleed B. The potential use of medical grade Manuka honey in the treatment of interstitial cystitis/ bladder pain syndrome. EUR UROL SUPPL 2021. [DOI: 10.1016/s2666-1683(21)01204-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Hamad H, Elhafez SA, Sorour M, Amin N, Abdelwahab O, El-ashtoukhy E. Functionalized lignin-based-adsorbent derived from black liquor in the paper industry for superior adsorption characteristics.. [DOI: 10.21203/rs.3.rs-789780/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Abstract
Lignin's availability in large amounts from industrial black liquor as waste from the paper industry is still a problem. On the other hand, its utilization potentials as a green low-cost adsorbent for the effective removal of toxic organic dye from industrial wastewater has become a topic of great interest but remains quite challenging. In this sense, this work aimed to evaluate the feasibility of removing the reactive green dye (RGD) onto the functionalized lignin-based adsorbent (FLA) by the acidic method. The kinetic study suggested the adsorption process confirmed to a pseudo-second-order-kinetic and intra-particle diffusion models. Also, the isotherm results showed that the FLA exhibited multi-layer adsorption. Meanwhile, the results of FTIR and SEM showed that the RG-19 adsorption mechanisms were electrostatic interaction, hydrogen bonding, π-π stacking, and physical adsorption. Thermodynamic parameters were also evaluated and their values indicated that adsorption of RG-19 onto FLA is an exothermic process and spontaneous in nature. As a renewable, low-cost, and natural biomass material, FLA has the potential to be used as a promising sustainable and economic application of biomass and will inspire more scholars to investigate solutions to the problem of contaminated water resources.
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Affiliation(s)
- Hesham Hamad
- City of Scientific Research and Technological Applications (SRTA-City)
| | - Sara Abd Elhafez
- City of Scientific Research and Technological Applications (SRTA-City)
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Gaballah MS, Abdelwahab O, Barakat KM, Aboagye D. A novel horizontal subsurface flow constructed wetland planted with Typha angustifolia for treatment of polluted water. Environ Sci Pollut Res Int 2020; 27:28449-28462. [PMID: 32418087 DOI: 10.1007/s11356-020-08669-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
Rapid population growth and urbanization has put a lot of stress on existing water bodies in most developing countries such as the Marriott Lake of Egypt. Three constructed wetland configurations including Typha angustifolia planted with enhanced atmospheric aeration by using perforated pipes networks (CWA), planted without perforated pipe network (CWR), and a control non-planted and without perforated pipes wetland (Control) were used in the study. Changes in physicochemical properties and microbial community over four seasons and hydraulic loading rate (HLR) (50, 100, 200, 300, and 400 L day-1 m-1) were monitored using influent from Marriott Lake in Egypt. Overall, the removal performance followed the sequence CWA>CWR>control. Turbidity removal of 98.4%; biochemical oxygen demand (BOD5) removal of 83.3%; chemical oxygen demand (COD) removal of 95.8%; NH3-N removal of 99.9%; total nitrogen (TN) removal of 94.7%; NO3--N and NO2--N increased; total P (TP) removal of 99.7%, Vibrio sp. of 100%, Escherichia coli 100%; total bacterial count of 92.3%; and anaerobic bacteria reduction of 97.5% were achieved by using CWA. Seasonal variation and variation in HLRs had significant effect on performance. The modified planted CWA system enhances the removal of pollutants and could present a novel route for reducing the cost associated with integrating artificial aeration into wetlands.
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Affiliation(s)
- Mohamed S Gaballah
- Environmental Division, National Institute of Oceanography and Fisheries, Alexandria, 21544, Egypt
| | - Ola Abdelwahab
- Environmental Division, National Institute of Oceanography and Fisheries, Alexandria, 21544, Egypt.
| | - Khouloud M Barakat
- Environmental Division, National Institute of Oceanography and Fisheries, Alexandria, 21544, Egypt
| | - Dominic Aboagye
- College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing, 100083, People's Republic of China
- Department of Agricultural and Bio-systems Engineering, Makerere University, P. O. Box 7062, Kampala, Uganda
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Garba K, Lwaleed B, Abdelwahab O, Yusuh M, Avery M, Birch B. Real world use of treatments in interstitial cystitis/painful bladder syndrome: Outcome of an online survey. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)32902-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Habous M, Giona S, Abdelwahab O, Laban O, Binsaleh S, Bettocchi C, Mundy A. Investigating if glycated hemoglobin and duration of diabetes have an impact on uroflowmetry results in diabetic men. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)33354-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Habous M, Teloken P, Abdelwahab O, Binsaleh S, Bettocchi C, Ralph D, Kamil U, Mulhall J. PS-07-013 Larger rod diameters in malleable implant surgery are correlated with more complications and less patient satisfaction. J Sex Med 2019. [DOI: 10.1016/j.jsxm.2019.03.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Habous M, Giona S, Muir G, Binsaleh S, Abdelwahab O, Nassar M, Abdelrahman Z, Elserafy A, Mulhall J, Ralph D. 259 Penile prosthesis implantation preserves penile length. J Sex Med 2018. [DOI: 10.1016/j.jsxm.2018.04.224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Habous M, Nassar M, Mahmoud S, Abdelrahman Z, Elserafy A, Abdelwahab O, Mekawi Z, Binsaleh S, Ralph D, Christopher N. 628 Comparing the outcome and adverse events in malleable versus inflatable penile implants. J Sex Med 2018. [DOI: 10.1016/j.jsxm.2018.04.535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Habous M, Tal R, Abdelwahab O, Mekawi Z, Mahmoud S, Binsaleh S, Mulhall J. PS-05-003 A cut-off Hba1c value of 8.5% predicts increased risk of penile implant infection. J Sex Med 2017. [DOI: 10.1016/j.jsxm.2017.03.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Habous M, Tal R, Mahmoud S, Tealab A, Mekawi Z, Kamr H, Kamil U, Elkhouly M, Binsaleh S, Abdelwahab O, Laban O, Mulhall J. 338 Predicting High Satisfaction in Men Undergoing Penile Implant Surgery. J Sex Med 2017. [DOI: 10.1016/j.jsxm.2016.11.228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Habous M, Tal R, Nassar M, Mahmoud S, Tealab A, Elkhouly M, Kamil U, Kamr H, Mekawi Z, Remeah A, Abdelwahab O, Mulhall J. 163 Defining Predictors of Penile Implant Infection. J Sex Med 2017. [DOI: 10.1016/j.jsxm.2016.11.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Duquennoy-Martinot V, Depoortère C, Deveaux C, Capon A, Abdelwahab O, François C, Guerreschi P. Indications de l’expansion chez l’enfant. Expérience de 30ans d’activité et revue de la littérature. ANN CHIR PLAST ESTH 2016; 61:740-749. [DOI: 10.1016/j.anplas.2016.06.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 06/19/2016] [Indexed: 11/28/2022]
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Habous M, Mahmoud S, Abdelwahab O, Laban O, Remeah A, Williamson B, Mulhall J. PS-01-004 Clomiphene citrate and human chorionic gonadotropins are good alternative therapy for hypogonadal men in restoring serum testosterone and improving patient symptoms. J Sex Med 2016. [DOI: 10.1016/j.jsxm.2016.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Habous M, Mahmoud S, Tealab A, Abdelwahab O, Laban O, Williamson B, Mulhall J, Ralph D. HP-05-003 Malleable penile prosthesis is an effective therapeutic option in patients with Peyronie's disease and erectile dysfunction. J Sex Med 2016. [DOI: 10.1016/j.jsxm.2016.03.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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El Nemr A, El-Sikaily A, Khaled A, Abdelwahab O. Removal of toxic chromium from aqueous solution, wastewater and saline water by marine red alga Pterocladia capillacea and its activated carbon. ARAB J CHEM 2015. [DOI: 10.1016/j.arabjc.2011.01.016] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Amin NK, El-Ashtouky ESZ, Abdelwahab O. Removal of copper powder from aqueous solution by cementation using an agitated vessel. Environ Technol 2014; 35:1208-1218. [PMID: 24701917 DOI: 10.1080/09593330.2013.865062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The present study is concerned with the removal of copper powder from aqueous solution by cementation on a stationary disc placed inside an agitated vessel. The influence of several parameters on the rate of cementation, such as initial copper sulphate concentration, impeller rotational speed, presence of surfactant (Triton X-100), distance between the disc and the impeller, type of blade turbine and presence of baffles, has been investigated. The rate of cementation was found to increase with increasing impeller rotational speed and initial copper sulphate concentration. On the other hand, the rate decreases with increasing distance between the disc and the impeller. The rate of cementation was inhibited in solutions containing Triton X-100. Performance of a four-blade 90 degree turbine with regard to the rate of copper cementation was superior to the performance of a four-blade 45 degree pitched turbine. The present data can be correlated in terms of mass transfer coefficient of cementation as Sh = 0.905 Sc0.33 Re0.89 (d/l)0.41 (four-blade 90 degree turbine); Sh = 0.815 Sc0.33Re0.79 (d/l)0.47 (four-blade 45 degree pitched turbine), for the conditions 2035 < Sc < 2810 and 35,000 < Re < 179,000.
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Attalla BAI, Karrar ZA, Ibnouf G, Mohamed AO, Abdelwahab O, Nasir EM, El Seed MA. Outcome of cholelithiasis in Sudanese children with Sickle Cell Anaemia (SCA) after 13 years follow-up. Afr Health Sci 2013; 13:154-9. [PMID: 23658582 PMCID: PMC3645102 DOI: 10.4314/ahs.v13i1.21] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND SCA causes chronic haemolysis which is a risk factor for cholelithiasis. OBJECTIVE To determine the prevalence and outcome of children with SCA complicated with gallstones treated at the sickle cell clinic at the children emergency hospital Khartoum state. METHODS 261 patients age 4 months to 16 years were studied. AUS examination was carried out. The 30 patients in whom gall stones were detected followed prospectively from June 1996 to September 2009 when a second AUS examination was obtained. RESULTS Gall stones occurred in 30 patients of whom four were lost to follow up in the first year. The overall prevalence of cholelithiasis was 11.5% and it increased with age. The youngest patient with cholelithiasis was 2 1/2 years old. Haematological variables, bilirubin and sex did not identify a subgroup of patients at higher risk for gallstones. All the patients were asymptomatic at the time of diagnosis. One patient developed symptoms 3years after the diagnosis and he was submitted to surgery. The 25 remaining asymptomatic patients were followed up for 13 years and none of them presented complications related to cholelithiasis during this period. CONCLUSION The prevalence of cholelithiasis in Sudanese children and adolescents with SCA was significant. The large majority patients remained asymptomatic over a long period.
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Affiliation(s)
- B A I Attalla
- Department of Paediatrics, University of Bahri, Khartoum, Sudan.
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Wavreille O, François Fiquet C, Abdelwahab O, Laumonier E, Wolber A, Guerreschi P, Pellerin P. Surgical and prosthetic treatment for microphthalmia syndromes. Br J Oral Maxillofac Surg 2012; 51:e17-21. [PMID: 22464758 DOI: 10.1016/j.bjoms.2012.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Accepted: 02/29/2012] [Indexed: 11/29/2022]
Abstract
Our aim was to evaluate the long-term outcomes of prosthetic treatment and orbital expansion in the management of microphthalmia syndromes. We did a retrospective single-centre study of all cases of microphthalmia treated between 1989 and 2010. The patients were divided into three groups: isolated microphthalmia, microphthalmia associated with micro-orbitism, and complex microphthalmia syndrome. To evaluate the results a score was computed for each patient by assessing the length of the palpebral fissure, the depth of the conjunctival fornix, and local complications together with an evaluation of the satisfaction of patients and their families. Forty-four children were included (27 boys and 17 girls). Twenty-seven had unilateral microphthalmia (61%) and 17 bilateral microphthalmia (39%). Twelve patients were lost to follow up. The mean duration of follow-up was 12 years (range 4-21). Management involved an ocular conformer in only 31 patients (71%). The treatment was deemed satisfactory in all except 10 children. Surgical treatment with orbital expansion permitted good symmetry of the orbital cavities with a final mean difference of 9% (range 3-17) compared with the initial 16.8% (range 13.6-20.3). The prosthetic treatment gives satisfactory results. Despite limited indications and difficult follow-up, our experience emphasises the value of surgical treatment for severe micro-orbitism.
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Affiliation(s)
- O Wavreille
- Service d'Ophtalmologie de l'Hôpital Claude Huriez, rue Michel Polonowski 59037 Lille Cedex, France.
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Khaled A, El Nemr A, El-Sikaily A, Abdelwahab O. Removal of Direct N Blue-106 from artificial textile dye effluent using activated carbon from orange peel: adsorption isotherm and kinetic studies. J Hazard Mater 2009; 165:100-10. [PMID: 19013711 DOI: 10.1016/j.jhazmat.2008.09.122] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 06/09/2008] [Accepted: 09/23/2008] [Indexed: 05/16/2023]
Abstract
The purpose of this study is to suggest an efficient process, which does not require a huge investment for the removal of direct dye from wastewater. Activated carbon developed from agricultural waste material was characterized and utilized for the removal of Direct Navy Blue 106 (DNB-106) from wastewater. Systematic studies on DNB-106 adsorption equilibrium and kinetics by low-cost activated carbons were carried out. Adsorption studies were carried out at different initial concentrations of DNB-106 (50, 75, 100, 125 and 150 mg l(-1)), contact time (5-180 min), pH (2.0, 3.0, 4.7, 6.3, 7.2, 8.0, 10.3 and 12.7) and sorbent doses (2.0, 4.0 and 6.0 g l(-1)). Both Langmuir and Freundlich models fitted the adsorption data quite reasonably (R(2)>97). The maximum adsorption capacity was 107.53 mg g(-1) for 150 mg l(-1) of DNB-106 concentration and 2 g l(-1) carbon concentration. Various mechanisms were established for DNB-106 adsorption on developed adsorbents. The kinetic studies were conducted to delineate the effect of initial dye concentration, contact time and solid to liquid concentration. The developed carbon might be successfully used for the removal of DNB-106 from liquid industrial wastes.
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Affiliation(s)
- Azza Khaled
- Department of Pollution, Environmental Division, National Institute of Oceanography and Fisheries, El-Anfoushy, Kayet Bey, Alexandria, Egypt
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Abdelwahab O, Amin NK, El-Ashtoukhy ESZ. Electrochemical removal of phenol from oil refinery wastewater. J Hazard Mater 2009; 163:711-716. [PMID: 18755537 DOI: 10.1016/j.jhazmat.2008.07.016] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2008] [Revised: 05/12/2008] [Accepted: 07/04/2008] [Indexed: 05/26/2023]
Abstract
This study explores the possibility of using electrocoagulation to remove phenol from oil refinery waste effluent using a cell with horizontally oriented aluminum cathode and a horizontal aluminum screen anode. The removal of phenol was investigated in terms of various parameters namely: pH, operating time, current density, initial phenol concentration and addition of NaCl. Removal of phenol during electrocoagulation was due to combined effect of sweep coagulation and adsorption. The results showed that, at high current density and solution pH 7, remarkable removal of 97% of phenol after 2h can be achieved. The rate of electrocoagulation was observed to increase as the phenol concentration decreases; the maximum removal rate was attained at 30 mg L(-1) phenol concentration. For a given current density using an array of closely packed Al screens as anode was found to be more effective than single screen anode, the percentage phenol removal was found to increase with increasing the number of screens per array. After 2h of electrocoagulation, 94.5% of initial phenol concentration was removed from the petroleum refinery wastewater. Energy consumption and aluminum Electrode consumption were calculated per gram of phenol removed. The present study shows that, electrocoagulation of phenol using aluminum electrodes is a promising process.
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Affiliation(s)
- O Abdelwahab
- Environmental Division, National Institute of Oceanography and Fisheries, Kayet Bay, El-Anfushy, Alexandria, Egypt.
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Nemr AE, Abdelwahab O, El-Sikaily A, Khaled A. Removal of direct blue-86 from aqueous solution by new activated carbon developed from orange peel. J Hazard Mater 2009; 161:102-110. [PMID: 18455301 DOI: 10.1016/j.jhazmat.2008.03.060] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Revised: 11/09/2007] [Accepted: 03/13/2008] [Indexed: 05/26/2023]
Abstract
The use of low-cost, easy obtained, high efficiency and eco-friendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from wastewater. This study investigates the potential use of activated carbon prepared from orange peel for the removal of direct blue-86 (DB-86) (Direct Fast Turquoise Blue GL) dye from simulated wastewater. The effects of different system variables, adsorbent dosage, initial dye concentration, pH and contact time were studied. The results showed that as the amount of the adsorbent increased, the percentage of dye removal increased accordingly. Optimum pH value for dye adsorption was determined as approximately 2.0. Maximum dye was sequestered within 30min after the beginning for every experiment. The adsorption of direct blue-86 followed a pseudo-second-order rate equation and fit well Langmuir, Tempkin and Dubinin-Radushkevich (D-R) equations better than Freundlich and Redlich-Peterson equations. The maximum removal of direct blue-86 was obtained at pH 2 as 92% for adsorbent dose of 6gL(-1) and 100mgL(-1) initial dye concentration at room temperature. The maximum adsorption capacity obtained from Langmuir equation was 33.78mgg(-1). Furthermore, adsorption kinetics of DB-86 was studied and the rate of adsorption was found to conform to pseudo-second-order kinetics with a good correlation (R2>0.99) with intraparticle diffusion as one of the rate determining steps. Activated carbon developed from orange peel can be attractive options for dye removal from diluted industrial effluents since test reaction made on simulated dyeing wastewater show better removal percentage of DB-86.
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Affiliation(s)
- Ahmed El Nemr
- Department of Pollution, Environmental Division, National Institute of Oceanography and Fisheries, El-Anfoushy, Kayet Bey, Alexandria, Egypt.
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El Nemr A, Khaled A, Abdelwahab O, El-Sikaily A. Treatment of wastewater containing toxic chromium using new activated carbon developed from date palm seed. J Hazard Mater 2008; 152:263-75. [PMID: 17693021 DOI: 10.1016/j.jhazmat.2007.06.091] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Revised: 05/26/2007] [Accepted: 06/27/2007] [Indexed: 05/16/2023]
Abstract
The use of a new activated carbon developed from date palm seed wastes, generated in the jam industry, for removing toxic chromium from aqueous solution has been investigated. The activated carbon has been achieved from date palm seed by dehydrating methods using concentrated sulfuric acid. The batch experiments were conducted to determine the adsorption capacity of the biomass. The effect of initial metal concentration (25-125mgl(-1)), pH, contact time, and concentration of date palm seed carbon have been studied at room temperature. A strong dependence of the adsorption capacity on pH was observed, the capacity increase as pH value decrease and the optimum pH value is pH 1.0. Kinetics and adsorption equilibrium were studied at different sorbent doses. The adsorption process was fast and the equilibrium was reached within 180min. The maximum removal was 100% for 75mgl(-1) of Cr(+ concentration on 4gl(-1) carbon concentration and the maximum adsorption capacity was 120.48mgg(-1). The kinetic data were analyzed using various kinetic models - pseudo-first order equation, pseudo-second order equation, Elovich equation and intraparticle diffusion equation - and the equilibrium data were tested using several isotherm models, Langmuir, Freundlich, Koble-Corrigan, Redlich-Peterson, Tempkin, Dubinin-Radushkevich and Generalized isotherm equations. The Elovich equation and pseudo-second order equation provide the greatest accuracy for the kinetic data and Koble-Corrigan and Langmuir models the closest fit for the equilibrium data. Activation energy of sorption has also been evaluated as 0.115 and 0.229kJmol(-1).
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Affiliation(s)
- Ahmed El Nemr
- Department of Pollution, Environmental Division, National Institute of Oceanography and Fisheries, El-Anfoushy, Kayet Bey, Alexandria, Egypt
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Abstract
The role of Chlamydia pneumoniae in 110 Sudanese children with signs of acute lower respiratory tract infections (ALRI) was investigated. Four (3.6%) had evidence of C. pneumoniae infection, of whom 3 were culture-positive, while 1 had an antibody response suggesting a recent infection. IgG antibodies at a titer of > or = 1:32 to C. pneumoniae, Chlamydia psittaci and Chlamydia trachomatis were detected in 27 (24.5%), 27 (24.5%) and 7 (6.4%) of the 110 ALRI cases, respectively. C. pneumoniae, C. trachomatis or C. psittaci were not detected in nasopharyngeal secretions from any of 110 patients when fluorescence-labeled specific monoclonal antibodies were used. In a seroepidemiological survey, 318 healthy Sudanese persons aged between 1 month and 67 years were studied for C. pneumoniae antibodies.
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Affiliation(s)
- B Herrmann
- Institute of Clinical Bacteriology, University of Uppsala, Sweden
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