Mohamed El-Khateeb - Academia.edu (original) (raw)

Papers by Mohamed El-Khateeb

Sexual Development, 2013

Access to full text and tables of contents, including tentative ones for forthcoming issues: www.... more Access to full text and tables of contents, including tentative ones for forthcoming issues: www.karger.com/sxd_issues 216 Translocation t(X;11)(q22;q25) in a Woman with Premature Ovarian Failure

Annals of Microbiology

Background The upflow anaerobic sludge blanket (UASB) reactors rely on bacterial communities to b... more Background The upflow anaerobic sludge blanket (UASB) reactors rely on bacterial communities to break down pollutants in wastewater (municipal or industrial). Methods and results In this study, a novel combination of UASB followed by aerobic treatment has been proposed for the treatment of municipal wastewater focusing on bacterial communities using high-throughput sequencing and parasite removal in this novel combination of reactors. Moreover, economic estimation of the compact unit composed of two overlapping UASB reactors, followed by a downflow hanging non-woven fabric (DHNW) reactor, the anaerobic baffled reactor (ABR), and chlorine unit was investigated in this study based on community populations of 1000 and 10,000 inhabitants, with a municipal plant capacity of 54,000 and 540,000 m3/year. Cost estimation was conducted based on two scenarios, one considering the contingency cost and auxiliary facility, and the other excluding them. Non-metric multidimensional scaling (nMDS) r...

WIT Transactions on the Built Environment, Dec 1, 2014

Water Science and Technology, May 23, 2016

Liming/unhairing operation is among the important processes of leather industry. It generates lar... more Liming/unhairing operation is among the important processes of leather industry. It generates large amounts of effluent that are highly loaded with organic hazard wastes. Such effluent is considered one of the most obnoxious materials in the leather industry, which causes serious environmental pollution and health risks. The effluent is characterized by high concentration of the pollution parameters. Conventional chemical and/or biological treatment of such wastewater is inefficient to meet the required limits of standard specifications due to the presence of resisting and toxic compounds. The present investigation deals with an effective treatment approach for the lime/unhair effluent using the integration of Fenton reaction followed by membrane filtration. The experiment was extended to a laboratory pilot-scale in a continuous treatment study. In this study the raw wastewater was treated with the predetermined Fenton's optimum dose followed by membrane filtration. The wastewater was efficiently treated and the final effluent could cope with the characteristics of the unrestricted water reuse.

DESALINATION AND WATER TREATMENT, 2017

The present study aims at investigating the performance of hybrid constructed wetlands (CWs) for ... more The present study aims at investigating the performance of hybrid constructed wetlands (CWs) for blackwater treatment. A pilot study of real blackwater samples was conducted in this investigation. This research describes an integrated system consisting of the sedimentation process as primary treatment followed by hybrid horizontal-vertical flow wetland for the treatment of concentrated blackwater as a strong wastewater. The results showed that the sedimentation tank was able to remove about 56.8%, 64.8%, and 58.0% for TSS, BOD, and COD, respectively, for the raw blackwater. When the effluent of the sedimentation tank was further treated by the subsurface horizontal wetland, the removal efficiency of TSS, BOD, and COD increased to 82.9%, 88.0%, and 87.1%, respectively. For upgrading the treated effluent, it was further subjected to vertical wetland. The overall removal of the pollution parameters of the combined system reached 97.4%, 98.0%, and 98.5% for TSS, BOD, and COD, respectively. As a result, the final effluent complied with the National Regulatory Standards for unrestricted water reuse. The present investigation concluded that the hybrid CWs offer a low-cost alternative for wastewater treatment, according to the climate of Africa, Middle East, arid, and semiarid areas. Such hybrid system could be implemented easily if the land area is available.

Solid State Phenomena, May 25, 2023

⎯Iron nanopowders ranging in particle size from 20 to 100 nm have been synthesized by reducing a ... more ⎯Iron nanopowders ranging in particle size from 20 to 100 nm have been synthesized by reducing a 1-mm-thick iron(III) hydroxide layer in flowing hydrogen at 400°C and then passivated for 6-60 min in flowing argon containing 3% air. Our results demonstrate that the passivated iron nanopowders do not oxidize in air for six months. The iron nanoparticles have been characterized by X-ray diffraction (crystallite size evaluation), Auger electron spectroscopy, and polymolecular adsorption. The passivated iron nanoparticles have been shown to consist of a metallic core and oxide shell 2-4 nm in thickness.

DESALINATION AND WATER TREATMENT, 2022

Treatment and reuse of wastewater can overcome the shortage and pollution of water resources. The... more Treatment and reuse of wastewater can overcome the shortage and pollution of water resources. The separation of domestic wastewater into greywater and blackwater fractions can reduce the loads in a huge part of domestic wastewater. The goal of this study is to examine how activated carbon (CAB) made from chicken bones performs in the treatment of greywater. The physicochemical characteristics of raw and treated greywater were evaluated before and after treatment. The effect of ashing temperature (300°C and 550°C) of the carbon activated bone (CAB) was investigated. The ideal carbonization temperature was 550°C. The X-ray diffraction and scanning electron microscopy techniques are used to characterize the CAB particles. The batch adsorption process was done with different adsorbent doses and contact times. Different doses of chicken bone ash (CBA) were examined. The optimal CBA dosage at 60 min of contact time was 0.8 mg/L. The pseudo-second-order models were used to fit the kinetic experimental data. The removal rate obtained for chemical oxygen demand, PO 4 , total Kjeldahl nitrogen, and total suspended solids was 95%, 96%, 97%, and 97% respectively. Meanwhile, with an R 2 of 0.99, the CBA's influence on batch adsorption was effectively represented by the Langmuir isotherm model. The CAB appears to be a potential adsorbent for the elimination of contaminants, according to the findings.

African Journal of Microbiology Research, May 21, 2014

The growth of the olive oil production in Saudi Arabia particularly in Al Jouf region in recent y... more The growth of the olive oil production in Saudi Arabia particularly in Al Jouf region in recent years has been accompanied by an increase in the discharge of associated processing waste. Olive mill waste is produced through the extraction of oil from the olive fruit using the traditional mill and press process. Deterioration of the environment due to olive mill wastes disposal is a serious problem. When olive mill waste is disposed into the soil, it affects soil quality, soil micro flora and also toxic to plants. The aim of this work is to isolate microorganism (bacterial or fungal strains) from OMW capable of degrading phenols. Olive mill wastewater, olive mill waste and soil (beside oil production mill) contaminated with olive waste were used for isolation of phenol tolerant microorganisms. Four strains (two fungal and two bacterial) were isolated from olive mill waste. The isolated strains were Candida tropicalis and Phanerochaete chrysosporium (fungal strains) and Bacillus sp. and Rhodococcus sp. (bacterial strains). These strains were able to degrade phenols and could be used for bioremediation of olive mill waste.

Egyptian Journal of Chemistry

This investigation was carried out at Egyptian-Chinese Friendship Forest, Sadat city, Menoufia Go... more This investigation was carried out at Egyptian-Chinese Friendship Forest, Sadat city, Menoufia Governorate during the period from March 2010 to November 2011 (21 months). This work aimed to study the effect of sewage water irrigation on macro nutrient, heavy metals concentrations and frequency percentage of fungi in the soil cultivated with six woody tree species namely Eucalyptus camaldulensis, E. citriodora, Pinus halepensis, P. brutia, P. pinea and Cupressus sempervirens. The obtained results pertaining irrigation water analysis indicated that sewage water had elevated the concentrations of such metals compared to well water, the concentrations of these metals in these two sources of irrigation water were within the permissible limits for their use as irrigation water. Also, heavy metals such as lead, cobalt and cadmium concentration were low and far below the critical level in sewage water. On the other hand, data showed that macro elements N, P and K at 30 and 60 cm soil depths...

Desalination and Water Treatment, Jul 1, 2009

World Academy of Science, Engineering and Technology, International Journal of Civil and Environmental Engineering, Jan 26, 2015

Clean-soil Air Water, Sep 6, 2021

Water resource limitation is one of the crises facing many countries worldwide. The work aims to ... more Water resource limitation is one of the crises facing many countries worldwide. The work aims to apply a compact unit consisting of a vertical settler (VS) followed by a self‐aerated chamber (SAC) for wastewater treatment. The dimensions of the unit are 2 × 1 × 2.5 m for length, width, and height, respectively. The hydraulic retention time (HRT) is 5 h in the VS for performance study while for the kinetic study the HRT is 4, 6, 8, 10, to 12 h. The unit is packed with a non‐woven fabric material produced from waste plastic. The influent organic concentrations expressed by chemical and biological oxygen demand (CODtot and BOD) are 367.7 and 254.7 mg L−1, respectively. The concentrations of CODtot and BOD in the treated effluent are 78.8 and 80.5% to 36.7 and 16.6 mg L−1, respectively. The prevailed removal kinetic for COD and nitrogen (N) concentrations is the second‐order reaction kinetic. With the exception of fecal coliform (FC), the final treated effluent meet the National regulatory requirements. The disinfection step is essential to reuse the final treated effluent safely. The unit can serve 100 p.e. in rural and unserved areas in developing countries with area of 2–3 m2.

Solid State Phenomena

To investigate the efficiency of silver nanoparticles synthesized by the green method, and evalua... more To investigate the efficiency of silver nanoparticles synthesized by the green method, and evaluate their antibacterial activity. The green method was used to synthesize silver nanoparticles (Ag NPs) from silver nitrate salt, and pomegranate peel extract (P) as a reducing agent. The synthesized Ag NPs were characterized by UV–visible spectrophotometer (UV–Vis), X-ray diffraction pattern (XRD), Fourier transform infrared (FT-IR), and scanning electron microscopy (SEM). The UV–Vis spectra displayed a resonance peak at 386 nm, equivalent to P-Ag NPs, and the FT-IR spectra confirmed the association of biological molecules from the extract in the synthesis process. The SEM image data confirmed the round and circular nature of Ag NPs. The EDX data presented the elemental configuration with a solid peak at 65 KeV that matched the silver. The antibacterial study of the synthesized nanoparticles was investigated by the agar diffusion method. We examined the antibacterial activity of biologic...

DESALINATION AND WATER TREATMENT

The aircraft factory maintains and paints the exterior surfaces of the aircraft structures. This ... more The aircraft factory maintains and paints the exterior surfaces of the aircraft structures. This work aims to treat the industrial wastewater of the aircraft factory. The concentration of phenol and chemical oxygen demand (COD) in industrial wastewater reached 125 and 11,763 mg/L, respectively. While the allowed limits for discharge on sewerage systems are 1,100 and 0.05 mg/L for COD and, phenol respectively. Fenton oxidation reaction (FOR) in addition to sawdust and date stone was tested for treating the wastewater. The effluent of the FOR was complying with the National Regulatory Standards. Another approach is to apply the pollution prevention concepts to remove the paint with the paint remover layer with the dry leaching. The suggestions were extended to the modification of the liquid waste collection tank to separate the floating matter in wastewater. The concentrations of phenol and COD were reduced from 125 and 11,763 mg/L to 0.04, and 985 mg/L, respectively. While the final concentrations of the phenol and COD were 0 and 572 mg/L in wastewater mixed with industrial wastewater from all the factory's sections. Thus, the industrial wastewater from the aircraft factory has become conforming to the National Regulatory Standards for discharge to the sewerage network.

DESALINATION AND WATER TREATMENT, 2018

The present study introduces a new technique using a combined up-flow anaerobic sludge bed (UASB)... more The present study introduces a new technique using a combined up-flow anaerobic sludge bed (UASB) followed by innovative down-flow hanging non-woven fabric (DHNW) for the treatment of domestic wastewater. The aim of this work is to develop an innovative non-woven packing material that can be used to improve the performance of both UASB and DHNW and other similar techniques for the treatment of wastewater. The packing material could be produced from waste plastic bottles, thus considerable part of solid waste can be reduced, recycled and applied in wastewater treatment plant to produce treated reusable effluent. The primary treatment was carried out using packed and classical UASB reactor (in parallel manner). The quality of the packed UASB effluent was better than that of the classical UASB reactor. Consequently, the effluent of the packed UASB reactor was fed directly to the DHNW reactor. The source of wastewater was the domestic wastewater from Zeneen's wastewater treatment station. The hydraulic residence time (HRT) of the UASB reactors was 6 h. The performance of the combined packed UASB/DHNW showed reduction of COD, BOD and TSS from 349.6, 260.6 and 171.3 to 44, 24 and 27 mg/L, respectively. The fecal coliform (FC)count was reduced by 3 log units using the combined packed UASB/DHNW system. The results indicated that polyethylene terephthalate (PET) spun-bond non-woven fabric can offer a cost effective solution as well as durable and efficient packing material for wastewater treatment.

Abstract The scarcity of water resources and climatic changes are among the factors that facing m... more Abstract The scarcity of water resources and climatic changes are among the factors that facing many countries of the world. Also, conflicts between some countries over water resources are a new threat which could lead to a loss of large quantities that were received by these countries. Therefore, wastewater treatment and reuse provide an unconventional water resource. The treatment and reuse reduce pollution of drinking water resources as a result of discharging untreated wastewater, thereby reducing the spread of epidemic diseases. Decentralized low-cost technologies that do not consume a lot of energy are one of the important solutions that draw the attention of decision-makers in many countries. The integration of the upflow anaerobic sludge blanket reactor and different posttreatment systems such as constructed wetlands, downflow hanging sponge and downflow hanging nonwoven fabric reactor.

Wetlands: ecology, conservation and management, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY