RO filtration of biologically treated textile and dyeing effluents using ozonation as a pre-treatment

Bench-scale experiments were conducted to investigate the application of ozonation pre-treatment for biologically treated textile and dyeing wastewater to improve performance of the RO process. Based on ozonation experiments, four specific ozone consumptions (SOC), 0, 0.3, 0.6, 4.0 mg O₃/mg DOC₀ wer...

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Bibliographic Details
Published in:Water science and technology 2010-01, Vol.62 (4), p.751-758
Main Authors: Wang, H Y, Guan, Y T, Mizuno, T, Tsuno, H
Format: Article
Language:English
Subjects:
Coloring Agents
Dyes
Effluents
Experiments
Filtration
Filtration - methods
Flow velocity
Fouling
Functional groups
Membrane processes
Membranes
Methods
Molecular weight
Organic Chemicals - isolation & purification
Organic matter
Ozonation
Ozone
Ozone - analysis
Ozone - isolation & purification
Pretreatment
Reverse osmosis
Textiles
Waste Disposal, Fluid - methods
Wastewater treatment
Water - standards
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
Water quality
X ray spectrometers
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Summary:Bench-scale experiments were conducted to investigate the application of ozonation pre-treatment for biologically treated textile and dyeing wastewater to improve performance of the RO process. Based on ozonation experiments, four specific ozone consumptions (SOC), 0, 0.3, 0.6, 4.0 mg O₃/mg DOC₀ were chosen for study of the effects of ozonation on the reverse osmosis (RO) process. Membrane flux was recorded. Also, the permeate water quality parameters such as TOC, conductivity were analyzed. In addition, fouled membrane cleaning was studied. The study further examined the nature and mechanisms of membrane fouling using scanning electron microscopy (SEM) and the energy dispersive X-ray spectrometer (EDS). The effect of ozonation on RO filtration was found to depend on SOC. The study revealed that significant improvement can be achieved in the efficiency of RO filtration by employing ozonation with 0.6 mg O₃/mg DOC₀ SOC. Although the product water purity slightly decreased, the ozonation pre-treatment showed advantages at 0.6 mg O₃/mg DOC₀ SOC for the following: (i) mitigation of flux decline due to membrane fouling; (ii) improvement in foulants cleanability. In addition, hypotheses were put forward to explain the reasons from the aspect of organic matter characteristics changed by ozonation, such as changing on functional groups and molecular weight of organic matter.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2010.126