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Register a new userModeling determination of kinetic and operational coefficients for a bioreactor used in olive mill wastewater treatment
تحديد الثوابت الحركية و التشغيلية بالنمذجة لمفاعل حيوي مستخدم في معالجة مياه صرف معاصر الزيتون
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بما أن التفاعل الحاصل في المفاعلات الحيوية المستخدمة في محطات معالجة المياه الملوثة ينضوي ضمن التفاعلات الإنزيمية الوسيطية فإنه يمكن استنباط الثوابت الحركية من نموذج Michaelis-Menten الرياضي. تم في هذا الدراسة إعداد برنامج حاسوبي مؤلف من جزأين بمساعدة برنامج إكسل.
Since the reaction in the WWPs bioreactors is included in enzymatic catalytic reactions type, then the kinetic coefficients can be determined due to Michaelis-Menten model. A tow-parts computational program was built by means of MS Excell.
References used
Henze, M., Harremoes, P., Jansen, J.L.C., Arvin, E. Wastewater Treatment Springer Verlag, Berlin 1995, p. 120-121
Richardson, J.F., Harker, J.H., Backhurst, J.R. Chemical engineering, ParticleTechnology and Separation processes 5th Edition, Vol 2, Butterworth-Heinemann, MA, USA, 2002
Viessman, W., Hammer, M.J. Water supply and pollution control 7th Edition, Pearson Education Inc., NJ, USA, 2005
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Pretreatment is one of the most important stage in olive mill
wastewater (OMWW) plants. Statistically, the cost of chemicals in
pretreatment will be not more than 0.02 €/m³OMWW for some kind of
chemical coagulants such as CaO.
Phenolic compounds are known to be present in high concentration
in various of agro industrial wastes such as olive mill wastewater. As
they are highly biorecalcitrant a possible treatment by Advanced
Oxidation Processes has to be investigated.
T
he photocatalytic degradation of the phenolic acids p-Hydroxybenzoic
acid, Dihydroxybenzoic acid, gallic acid, vanillic acid, syringic acid) in the
presence of TiO2 deposit on a glass plate has been reported. A comparison for
the adsorption properties and the kinetics of reaction have been studied. The
kinetics were found to be first order for all compounds and were compared
with the compounds’ structures. The reaction rate for the compounds was
found as the order Di-HBA < GA < p-HBA ≈ SA ≈ VA.
The influence on the photdegradation rate of various parameters as pH, and
substrate’s concentration was studied for p-Hydroxybenzoic acid only. It was
found that the reaction is pH and substrate’s concentration dependence.
A removal efficiency (50-70%) was determined after 5hr using UVlamp
(15W- λ=360nm) and it increased up to 95% when H2O2 was
added.
Paper mill wastewater is an environment contaminated wastewater , and refractory to biological treatment due to its high value of COD and low value of BOD_5.
This research studies the treatment of mentioned wastewater using Fenton Oxidation Fe^(2+)/
H_2 O_2. The effect of some key elements on this oxidation such as H_2 O_2 and Fe^(2+) doses, dosage strategy of H_2 O_2, with a pH value near 3 was studied. Fenton method showed high efficiency of COD removal reached 78.5 % with a total hydrogen peroxide dose of 2.2g/l applied in four doses and intervals of 15min.
Experiments also proved that intermittent dosage - four doses - are better than giving whole dose in one stroke. Results appeared evidently in two points: the efficiency of COD removal and the ratio of BOD5/COD; since we reached through intermittent dosages a value of BOD5/COD near 0.32 , which eventually allows effluent from Fenton oxidation process to be treated biologically.
The adsorption ability of those pollutants by the Anion exchanger
( A36MB ) have been studied. A good results have been obtained
after( 8 hour ) as a real time of this operation . The removal ratio
reach up to( 96.62%) , when the quantity of the s
olid ( Anion
exchanger) was about 10 gr and the wastewater about 150 gr
where the ratio of( sold/water) was about 6.666 % .
The aim of this research, is to use Liquid–liquid extraction to separate
phenolic compounds from olive mill wastewater resulted from three-phase
centerfuge extraction (OMWW). Four solvents were used: Methyl iso butyl
ketone (MIBK), Ethyl acetate (
EtOAc), Octanol-1 (C8H18O), and Noctanoylpyrrolidine
(OPOD) which was synthesized in our lab. The effects of
pH and Extraction stages on the efficiency of total phenolic compound
extracted from OMWW were determined by Folin - Ciocalteu
spectrophotometric method. Ferulic acid (FA) and Caffeic acid (CA) were
determined in extractants by HPLC. The COD value in water phase of the four
extracts was measured together with the reducing power and radicalscavenging
effects for the extracts. We compared the antioxidant activity of
MIBK, OPOD extracts, with ferulic acid (FA), caffeic acid (CA), ascorbic acid
standards and rosemary.
The results showed that MIBK had the highest extraction efficiency and
gave the maximum quantity of phenols from OMWW, than OPOD, C8H18O,
EtOAc. The COD value was decreased about %94.5 by MIBK, %83.7 by
OPOD,%81 by C8H18O, and%72 by EtOAc. The phenols extracted by MIBK
could be added to eatable oils as natural antioxidants, because they were
superiority on rosemary, and nearly to caffeic acid (CA) standard.
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