A Comparative Study to Analyse Efficacy of O3, O3/UV, O3/UV/PS for the Degradation of Reactive Dyes in Wastewater
Sharma, Sandip
A Comparative Study to Analyse Efficacy of O3, O3/UV, O3/UV/PS for the Degradation of Reactive Dyes in Wastewater by Sandip Sharma - Ahmedabad Nirma Institute of Technology 2017 - 119p Ph. D. Thesis with Synopsis and CD
Guided by: Dr. J. P. Ruparelia With Synopsis and CD 10EXTPHDE47
ABSTRACT:
The aim of present work was to investigate the performance assessment of reactor
configurations for mineralization of synthetic wastewater by ozonation and ozone based
Advanced Oxidation Processes (AOPs), i.e., O3, O3/UV, O3/UV/PS. Preliminary studies
were carried out in Bubble column reactor with RB5 dye and efforts have been made to
determine effects of various operating parameters such as, ozone flowrate, pH, UV
intensity and TOC: PS ratio on selected processes i.e. O3, O3/UV and O3/UV/PS at
constant parameters such as, initial concentration of RB5 at 500 mg/L, 12 pH, 60 LPH
flow of O3, UV intensity 66 W (if applicable) and TOC:PS ratio 1:40 (if applicable). It
was observed that O3/UV/PS is more efficient in removal of TOC. Further, experiments
were conducted in the bubble column with recirculation and in Venturi reactor, the result
exhibited better performance of Venturi reactor in terms of %TOC removal. Further, the
design of experiments was planned with parameters such as types of dye, water
recirculation flow, pH, ozone flow, UV intensity, TOC:PS ratio and initial dye
concentration, for both the reactor configuration. The study revealed that in Bubble
column with recirculation reactor, water recirculation had a significant effect on overall
treatment performance, i.e. %TOC removal, whereas, for Venturi reactor dye had a
significant effect on overall treatment performance. In design of experiments excluding
dye as parameter and remaining set of parameters as it is, with three different dyes, i.e.,
RB5, RY145 and RR 120 for both the reactor configuration, confirmed superior
performance of Venturi reactor. The better performance of Venturi reactor may be
attributed to proper contact of ozone, persulfate, and pollutant. Based on design of
experiments best operating parameters were chosen to be 1.86 g hr-1 ozone flowrate, 12
pH, 66W UV intensity and 1:40 TOC:PS ratio. It was also investigated that %TOC removal of synthetic dye solution of selected reactive dyes follows pseudo first order
kinetics with respect to the dye. Compared to Bubble column with recirculation,
degradation rate was higher in Bubble column and Venturi reactor. In addition, kinetic
studies were conducted for O3/UV/PS process in three different reactor configurations.
The kinetic rate constants obtained were, 0.0122 min-1, 0.0115 min-1 and 0.0205 min-1
for Bubble column, Bubble column with recirculation and Venturi, respectively. Thus,
O3/UV/PS was found to be a most efficient process with Venturi reactor amongst the
above-mentioned processes. Further, studies were carried out with the optimized
parameters for O3/UV/PS in Venturi reactor for an individual dye to identify some
important parameters such as kinetic rate constant, EE/O and TOC/OCC. Studies
revealed TOC removal 86.34%, 82.14% and 59.47% for RB5, RR120, and RY145
respectively. In addition, the result of EE/O which is used to analyze the effectiveness of
selected AOPs on the basis of electrical energy consumption, was 125.35, 144.88 and
276.40 for RB5, RR120, and RY145 respectively, reflects higher energy consumption
per order reaction for RY145. Similarly, TOC/OCC results were 0.053, 0.043 and 0.039
for RB5, RR120, and RY145 respectively, reflects recalcitrant nature of RY145. Thus,
the research concluded that O3/UV/PS process provides efficient removal of TOC.
However, its performance depends on reactor configuration. Venturi reactor is more
efficient than bubble column reactor with recirculation.
TT000061 / SHA
A Comparative Study to Analyse Efficacy of O3, O3/UV, O3/UV/PS for the Degradation of Reactive Dyes in Wastewater by Sandip Sharma - Ahmedabad Nirma Institute of Technology 2017 - 119p Ph. D. Thesis with Synopsis and CD
Guided by: Dr. J. P. Ruparelia With Synopsis and CD 10EXTPHDE47
ABSTRACT:
The aim of present work was to investigate the performance assessment of reactor
configurations for mineralization of synthetic wastewater by ozonation and ozone based
Advanced Oxidation Processes (AOPs), i.e., O3, O3/UV, O3/UV/PS. Preliminary studies
were carried out in Bubble column reactor with RB5 dye and efforts have been made to
determine effects of various operating parameters such as, ozone flowrate, pH, UV
intensity and TOC: PS ratio on selected processes i.e. O3, O3/UV and O3/UV/PS at
constant parameters such as, initial concentration of RB5 at 500 mg/L, 12 pH, 60 LPH
flow of O3, UV intensity 66 W (if applicable) and TOC:PS ratio 1:40 (if applicable). It
was observed that O3/UV/PS is more efficient in removal of TOC. Further, experiments
were conducted in the bubble column with recirculation and in Venturi reactor, the result
exhibited better performance of Venturi reactor in terms of %TOC removal. Further, the
design of experiments was planned with parameters such as types of dye, water
recirculation flow, pH, ozone flow, UV intensity, TOC:PS ratio and initial dye
concentration, for both the reactor configuration. The study revealed that in Bubble
column with recirculation reactor, water recirculation had a significant effect on overall
treatment performance, i.e. %TOC removal, whereas, for Venturi reactor dye had a
significant effect on overall treatment performance. In design of experiments excluding
dye as parameter and remaining set of parameters as it is, with three different dyes, i.e.,
RB5, RY145 and RR 120 for both the reactor configuration, confirmed superior
performance of Venturi reactor. The better performance of Venturi reactor may be
attributed to proper contact of ozone, persulfate, and pollutant. Based on design of
experiments best operating parameters were chosen to be 1.86 g hr-1 ozone flowrate, 12
pH, 66W UV intensity and 1:40 TOC:PS ratio. It was also investigated that %TOC removal of synthetic dye solution of selected reactive dyes follows pseudo first order
kinetics with respect to the dye. Compared to Bubble column with recirculation,
degradation rate was higher in Bubble column and Venturi reactor. In addition, kinetic
studies were conducted for O3/UV/PS process in three different reactor configurations.
The kinetic rate constants obtained were, 0.0122 min-1, 0.0115 min-1 and 0.0205 min-1
for Bubble column, Bubble column with recirculation and Venturi, respectively. Thus,
O3/UV/PS was found to be a most efficient process with Venturi reactor amongst the
above-mentioned processes. Further, studies were carried out with the optimized
parameters for O3/UV/PS in Venturi reactor for an individual dye to identify some
important parameters such as kinetic rate constant, EE/O and TOC/OCC. Studies
revealed TOC removal 86.34%, 82.14% and 59.47% for RB5, RR120, and RY145
respectively. In addition, the result of EE/O which is used to analyze the effectiveness of
selected AOPs on the basis of electrical energy consumption, was 125.35, 144.88 and
276.40 for RB5, RR120, and RY145 respectively, reflects higher energy consumption
per order reaction for RY145. Similarly, TOC/OCC results were 0.053, 0.043 and 0.039
for RB5, RR120, and RY145 respectively, reflects recalcitrant nature of RY145. Thus,
the research concluded that O3/UV/PS process provides efficient removal of TOC.
However, its performance depends on reactor configuration. Venturi reactor is more
efficient than bubble column reactor with recirculation.
TT000061 / SHA