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Search Results: 1 - 10 of 461943 matches for " Suleyman A. Muyibi "
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Production of Natural Coagulant from Moringa Oleifera Seed for Application in Treatment of Low Turbidity Water  [PDF]
Eman N. Ali, Suleyman A. Muyibi, Hamzah M. Salleh, Md Zahangir Alam, Mohd Ramlan M. Salleh
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.23030
Abstract: This study focused on developing an efficient and cost effective processing technique for Moringa oleifera seeds to produce natural coagulant for use in drinking water treatment. The produced natural coagulant can be used as an alternative to aluminum sulphate and other coagulants and used worldwide for water treatment. This study investigates processing Moringa oleifera seeds to concentrate the bio-active constituents which have coagulation activity. Moringa oleifera seeds were processed for oil extraction using electro thermal soxhlet. Isolation and purification of bio-active constituents using chromatography technique were used to determine the molecular weight of the bio-active constituents. The molecular weight of bio-active constitu-ents found to be in a low molecular weight range of between 1000 – 6500 Dalton. The proposed method to isolate and purify the bio-active constituents was the cross flow filtration method, which produced the natu-ral coagulant with very simple technique (oil extraction; salt extraction; and microfiltration through 0.45 µm). The turbidity removal was up to 96.23 % using 0.4 mg/L of processed Moringa oleifera seeds to treat low initial turbidity river water between 34-36 Nephelometric Turbidity Units (NTU) without any additives. The microfiltration method is considered to be a practical method which needs no chemicals to be added com-pared to other researchers proposed methods. The natural coagulant produced was used with low dosages to get high turbidity removal which considered to be a breakthrough in this study and recommended to be scaled up for industry level. The product is commercially valuable at the same time it is minimizing the cost of water treatment.
Screening of Potential Strains and Co-substrate for Production of Cellulase Enzyme using Sewage Treatment Plant Sludge as Major Substrate
Afifah Drani,Md. Zahangir Alam,Suleyman A. Muyibi
Biotechnology , 2011,
Abstract: Potential fungal strains belonging to the genera of Penicillium, Trichoderma and Aspergillus were isolated from various waste sources and tested for their capability to produce cellulase enzyme using Sewage Treatment Plant (STP) sludge as a major substrate. The isolation technique was used in the Potato Dextrose Agar (PDA) media incorporated with the sewage sludge (0.5% Total Suspended Solids, TSS). In addition 1 mL of streptomycin was used to control the growth of bacteria. Colonies appeared in the plate were transferred to the fresh PDA plate for purification and identification. Out of 35 strains, five strains were identified as the potential strains to produce cellulase through Filter Paper Activity (FPA) assay. These five promising strains were TH(U), S-105A and P2-STP isolated from STP sludge, P1-EFB isolated from Empty Fruit Bunched (EFB) compost and O-102A isolated from rotten orange. Various carbon sources; wheat flour, cassava flour, commercial sugar and cellulose were evaluated as a co-substrate with and without EFB supplement using these five potential strains. The strain O-102A was identified as the most promising strain that able to produce cellulase enzyme using STP sludge as a major substrate, cellulose as a co-substrate with supplement of oil palm Empty Fruit Bunches (EFB).
Statistical optimization of adsorption processes for removal of 2,4-dichlorophenol by activated carbon derived from oil palm empty fruit bunches
Md Zahangir ALAM,Suleyman A MUYIBI,Juria TORAMAE,
Md. Zahangir ALAM
,Suleyman A. MUYIBI,Juria TORAMAE

环境科学学报(英文版) , 2007,
Abstract: The adsorption capacity of activated carbon produced from oil palm empty fruit bunches through removal of 2,4-dichlorophenol from aqueous solution was carried out in the laboratory. The activated carbon was produced by thermal activation at 800℃ with 30 min of activation time. The adsorption process conditions were determined with the statistical optimization followed by central composite design. A developed polynomial model for operating conditions of adsorption process indicated that the optimum conditions for maximum adsorption of phenolic compound were: agitation rate of 100 r/min, contact time of 8 h, initial adsorbate concentration of 250 mg/L and pH 4. Adsorption isotherms were conducted to evaluate biosorption process. Langmuir isotherm was more favorable (R2=0.93) for removal of 2,4-dichlorophenol by the activated carbon produced rather than the Freundlich isotherm (R2=0.88).
Removal of phenol by activated carbons prepared from palm oil mill effluent sludge
Md Zahangir ALAM,Suleyman A MUYIBI,Mariatul FMANSOR,Radziah WAHID,
Md. Zahangir ALAM
,Suleyman A. MUYIBI,Mariatul F.MANSOR,Radziah WAHID

环境科学学报(英文版) , 2006,
Abstract: The study was attempted to produce activated carbons from palm oil mill effluent (POME) sludge. The adsorption capacity of the activated carbons produced was evaluated in aqueous solution of phenol. Two types of activation were followed, namely, thermal activation at 300, 500 and 800 degrees C, and physical activation at 15 degrees C (boiling treatment). A control (raw POME sludge) was used to compare the adsorption capacity of the activated carbons produced. The results indicated that the activation temperature of 800 degrees C showed maximum absorption capacity by the activated carbon (POME 800) in aqueous solution of phenol. Batch adsorption studies showed an equilibrium time of 6 h for the activated carbon of POME 800. It was observed that the adsorption capacity was higher at lower values of pH (2-3) and higher value of initial concentration of phenol (200-300 mg/L). The equilibrium data were fitted by the Langmuir and Freundlich adsorption isotherms. The adsorption of phenol onto the activated carbon POME 800 was studied in terms of pseudo- first and second order kinetics to predict the rate constant and equilibrium capacity with the effect of initial phenol concentrations. The rate of adsorption was found to be better correlation for the pseudo-second order kinetics compared to the first order kinetics.
Activated carbons derived from oil palm empty-fruit bunches: Application to environmental problems
Activated carbons derived from oil palm empty-fruit bunches: Application to environmental problems

Md Zahangir ALAM,Suleyman A MUYIBI,Mariatul F MANSOR,Radziah WAHID,
Md. Zahangir ALAM
,Suleyman A. MUYIBI,Mariatul F. MANSOR,Radziah WAHID

环境科学学报(英文版) , 2007,
Abstract: Activated carbons derived from oil palm empty fruit bunches (EFB) were investigated to find the suitability of its application for removal of phenol in aqueous solution through adsorption process. Two types of activation namely; thermal activation at 300, 500 and 800℃ and physical activation at 150℃ (boiling treatment) were used for the production of the activated carbons. A control (untreated EFB) was used to compare the adsorption capacity of the activated carbons produced from these processes. The results indicated that the activated carbon derived at the temperature of 800℃ showed maximum absorption capacity in the aqueous solution of phenol. Batch adsorption studies showed an equilibrium time of 6 h for the activated carbon at 800℃. It was observed that the adsorption capacity was higher at lower values of pH (2-3) and higher value of initial concentration of phenol (200-300 mg/L). The equilibrium data fitted better with the Freundlich adsorption isotherm compared to the Langmuir. Kinetic studies of phenol adsorption onto activated carbons were also studied to evaluate the adsorption rate. The estimated cost for production of activated carbon from EFB was shown in lower price (USD 0.50/kg of AC) compared the activated carbon from other sources and processes.
Persistence of invertibility on the Wiener space
A. Suleyman Ustunel
Mathematics , 2010,
Abstract: Let $(W,H,\mu)$ be the classical Wiener space, assume that $U=I_W+u$ is an adapted perturbation of identity where the perturbation $u$ is an equivalence class w.r.to the Wiener measure. We study several necessary and sufficient conditions for the almost sure invertibility of such maps. In particular the subclass of these maps who preserve the Wiener measure are characterized in terms of the corresponding innovation processes. We give the following application: let $U$ be invertible and let $\tau$ be stopping time. Define $U^\tau$ as $I_W+u^\tau$ where $u^\tau$ is given by $$ u^\tau(t,w)=\int_0^t 1_{[0,\tau(w)]}(s)\dot{u}_s(w)ds\,. $$ We prove that $U^\tau$ is also almost surely invertible. Note that this has immediate applications to stochastic differential equations.
Tertiary Treatment of Biologically Treated Palm Oil Mill Effluent (POME) Using UF Membrane System: Effect of MWCO and Transmembrane Pressure
Idrisa M. A.,Jami M. S.,Muyibi S. A.
International Journal of Chemical and Environmental Engineering , 2010,
Abstract: This study evaluate the performance of ultrafiltration UF membrane system in the treatment of biologically treated palm oil mill effluent(POME) by varying the effects of transmembrane pressure and using different molecular weight cut-off (MWCO). Flat sheetpolyethersulfone (PES) ultrafiltration membrane of molecular weight cut-off (MWCO) 1 kDa and 5 kDa were used in this study.Biologically treated POME was subjected to physical pretreatment processes, consisting of coagulation and adsorption to remove totalsuspended solids. Transmembrane pressure was varied between 0.5 bar to 1.5 bar and the performance of these membrane systems wereassessed in terms of reduction of chemical oxygen demand (COD), color and turbidity in POME. Pretreatment processes which consist ofcoagulation and adsorption showed remarkable results in reducing COD, color and turbidity up to 92.8 %, 99.3 % and 99.9 % respectively.At transmembrane pressure 0.5 bar, more reduction in COD, colour and turbidity were observed. The smallest MWCO of the membrane attransmembrane pressure 0.5 bar gave a better reduction of pollutants from the pretreated POME. The increasing transmembrane pressureleads to a corresponding increase in permeate flux which starts to level off at higher transmembrane pressures. The application ofmembrane separation technology to treat biologically treated POME has improved the quality of the final effluent discharged. The UFmembrane plays very important role in reducing pollutants present in biologically treated POME.
Localization, Smoothness, and Convergence to Equilibrium for a Thin Film Equation
Eric A. Carlen,Suleyman Ulusoy
Mathematics , 2010,
Abstract: We investigate the long-time behavior of weak solutions to the thin-film type equation $$v_t =(xv - vv_{xxx})_x\ ,$$ which arises in the Hele-Shaw problem. We estimate the rate of convergence of solutions to the Smyth-Hill equilibrium solution, which has the form $\frac{1}{24}(C^2-x^2)^2_+$, in the norm $$|\!|\!| f |\!|\!|_{m,1}^2 = \int_{\R}(1+ |x|^{2m})|f(x)|^2\dd x + \int_{\R}|f_x(x)|^2\dd x\ .$$ We obtain exponential convergence in the $|\!|\!| \cdot |\!|\!|_{m,1}$ norm for all $m$ with $1\leq m< 2$, thus obtaining rates of convergence in norms measuring both smoothness and localization. The localization is the main novelty, and in fact, we show that there is a close connection between the localization bounds and the smoothness bounds: Convergence of second moments implies convergence in the $H^1$ Sobolev norm. We then use methods of optimal mass transportation to obtain the convergence of the required moments. We also use such methods to construct an appropriate class of weak solutions for which all of the estimates on which our convergence analysis depends may be rigorously derived. Though our main results on convergence can be stated without reference to optimal mass transportation, essential use of this theory is made throughout our analysis.
Log-concave measures
Denis Feyel,A. Suleyman Ustunel
Mathematics , 2010,
Abstract: We study the log-concave measures, their characterization via the Pr\'ekopa-Leindler property and also define a subset of it whose elements are called super log-concave measures which have the property of satisfying a logarithmic Sobolev inequality. We give some results about their stability. Certain relations with measure transportation of Monge-Kantorovitch and the Monge-Amp\'ere equation are also indicated with applications.
Statistical optimization of process parameters for the production of citric acid from oil palm empty fruit bunches
N Bari, Z Alam, SA Muyibi, P Jamal, A Al-Mamun
African Journal of Biotechnology , 2010,
Abstract: In this study, optimization of process parameters such as moisture content, incubation temperature and initial pH (fixed) for the improvement of citric acid production from oil palm empty fruit bunches through solid state bioconversion was carried out using traditional one-factor-at-a-time (OFAT) method and response surface methodology (RSM). The possible optimum level of moisture content, incubation temperature, and initial pH were found from the OFAT study to be 70%, 30 - 32oC and 5.5 - 8, respectively. The optimum moisture content of 70.3% (v/w) and incubation temperature of 33.1°C with initial pH of 6.5 gave the maximum production of citric acid (369.16 g/kg of dry EFB). The analysis of variance (ANOVA) of the statistical optimization using central composite design showed that moisture content (p<0.001) and incubation temperature (p<0.0001) as well as the interaction of these two parameters were highly significant for the citric acid production.
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