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| Articles
by
Gholamreza Moussavi |
Total Records (
2 ) for
Gholamreza Moussavi |
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Abbas Rezaee
,
Mohammad Taghi Ghaneian
,
Sayed Jamalodin Hashemian
,
Gholamreza Moussavi
,
Ali Khavanin
and
Ghader Ghanizadeh
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Photo-oxidation of dyes is a new concern among researchers since it offers an attractive method for decoloration of dyes and breaks them into simple mineral forms. An advanced oxidation process, UV/H2O2, was investigated in a laboratory scale photoreactor for decolorization of the Reactive blue 19 (RB19) dye from synthetic textile wastewater. The effects of operating parameters such as hydrogen peroxide dosage, pH, initial dye concentration and UV dosage, on decolorization have been evaluated. The RB19 solution was completely decolorized under optimal hydrogen peroxide dosage of 2.5 mmol L-1 and low-pressure mercury UV-C lamps (55 w) in less than 30 min. The decolorization rate followed pseudo-first order kinetics with respect to the dye concentration. The rate increased linearly with volumetric UV dosage and nonlinearly with increasing initial hydrogen peroxide concentration. It has been found that the degradation rate increased until an optimum of hydrogen peroxide dosage, beyond which the reagent exerted an inhibitory effect. From the experimental results, the UV/H2O2 process was an effective technology for RB19 dye treatment in wastewater. |
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Gholamreza Moussavi
,
Kazem Naddafi
and
Alireza Mesdaghinia
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Development of an acclimatized SOB biofilm, startup
and performance of a fixed bed bioscrubber packed with corrugated tube
parts as a media having high specific surface area was investigated. Bioscrubber
was a cylindrical Plexiglas air-and water-tight column with 10 L in working
bed volume. Sludge from a tannery wastewater treatment plant was used
as a seed for SOB separation, acclimation and enrichment. Enriched acclimatized
SOB were applied as inoculum for biofilm development, which was carried
out by recirculating the prepared microbial suspension through the bed.
Thickness of the developed biofilm was 56 μm in which active acidophilic
autotrophic H2S oxidizing bacteria were completely predominated.
Activity measurements showed highest biodegradation rate of biofilm at
liquid pH around 3. Due to employing an efficient specialized biofilm,
startup period of the reactor was quite short and H2S removal
efficiency just 12 h after starting up reached above of 92% and increased
to 96% at day 3 of starting up while inlet H2S concentration
gradually was increased to around 30 ppm. At the end of start up pH of
the recycle liquid was modified to the optimal value of 3±0.5 in
which biofilm demonstrated the highest activity in terms of OUR after
which removal efficiency increased around 3% while other operating conditions
were consistent. Furthermore, performance of the bioscrubber was evaluated
at various inlet H2S concentrations ranging from 30 to 150
ppmv. It was indicated that the inlet H2S concentrations
in studied range did not affect the performance of the bioscrubber so
that the removal efficiency of H2S was greater than 99.4% at
all concentrations. These observations suggested that the development
of an efficient specialized SOB biofilm on a media with high specific
surface area will decrease the startup course and achieve high removal
efficiency in the bioscrubber treating H2S. In addition, operation
in acidic recycle liquid will overcome use of alkaline to adjust the pH,
which reduce the operation cost of the control system.
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