Removal of methyl violet dye from wastewater using combined solar photocatalysis-membrane separation technology

Dissertant

Hamzah, Nur Husayn

Thesis advisor

Abd al-Rahman, Amir A.
Abid, Muhammad F.

University

University of Technology

Faculty

-

Department

Department of Chemical Engineering

University Country

Iraq

Degree

Master

Degree Date

2013

English Abstract

Currently, the falling-film slurry photocatalytic degradation technique using TiO2 is becoming increasingly feasible for the removal of toxic and refractory organic compounds.

This is because the photocatalytic method makes it possible for the organic compounds to be easily degraded under mild conditions.

This work focuses on the degradation of toxic organic compounds a methyl violet dye (MV) in water, using a combined falling-film slurry photocatalysis/low pressure reverse osmosis (LPRO) system.

The performance of the hybrid system was investigated in terms of the removal efficiency of MV, COD and membrane separation of TiO2.

Another aim of the present study is to design solar reactor and analyze its performance for removal of MV from water with titanium dioxide as the photocatalyst.

Various operating parameters were studied to investigate the behavior of the designed reactor like initial dye concentration (10-50 ??/?), loading of catalyst (????2 200-800 ??/?), suspension flow rate (?? 0.3-2 ?/???), pH of suspension (5-10), and H2O2 concentration (??2?2 200-1000 ??/?).

The operating parameters were optimized to give higher efficiency to the reactor performance.

The optimum parameters were loading of catalyst (400??/?), suspension flow rate (0.5?/???), H2O2 concentrate (400 ??/?), and pH=5.The designed reactor has given a better degradation of MV up to 0.9527within one hour of operation time, while a conversion of 0.9995 was obtained in three hours.

The effluent from the photocatalytic reactor was feeding to LPRO separation system which produced a permeate of turbidity value of 0.09 NTU which is close to that of drinking water (i.e., 0.08 NTU).

The product water was analyzed using UV-spectrophotometer and FTIR.

The analysis results confirm that water from the Hybrid-System could be safely recycled and reused.

It was found that the kinetics of dye degradation is first order with respect to dye concentration and could be well described by Langmuir-Hinshelwood model with the following rate law, ?= 0.0165 ? 1+0.0209 ? A power-law based empirical correlation is developed for the photocatalysis system, related the dye degradation (R) with the studied operating conditions.

?=13.66 (????2)−0.07 (??2?2)−0.14 (??)−0.92 (??)−0.47 (???)−0.04 The correlation coefficient (CF) of Equation is 98.09%.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Water

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-418288