The goal of this case study was to investigate the behavior of real textile wastewater
in DCMD (Direct Contact Membrane Distillation) treatment and subsequently to
develop a simple and effective pretreatment for it. To this moment, this work is one of
the only studies to make an in-depth analysis of the treatment while considering the
complexity of this effluent, which is inherently composed of Volatile Organic
Compounds (VOCs) and surfactants. After the application of pretreatment, it became
clear that the main concern with textile wastewater treatment using MD is wetting, not
fouling. Sedimentation and filtration alone were effective in removing suspended
solids, but insufficient in stopping wetting. However, neutralization before
sedimentation and filtration was proven to be a fundamental step in reducing wetting
rates. This improved performance happens due to the change in pH of the wastewater
sample, which increases the rejection rates by the membrane. The best experiments,
neutralized to pHs 7.40 and 9.06, achieved up to 99.89% rejection by the membrane,
with up to 97% conductivity decrease when compared to an experiment without
neutralization, 97% removal of COD, and 98% TOC. Overall, the permeate obtained
in this work after pretreatment demonstrated excellent quality, and the recovered
effluent can possibly be reused in the textile industry, aiming for Zero Liquid
Discharge (ZLD) processes. Thus, scaling up this technology for real industrial use is
still necessary, tailoring the treatment to the effluent's characteristics to obtain the best
results.
| Identifer | oai:union.ndltd.org:kaust.edu.sa/oai:repository.kaust.edu.sa:10754/691716 |
| Date | 04 1900 |
| Creators | Rodrigues, Mariana |
| Contributors | Vrouwenvelder, Johannes S., Biological and Environmental Science and Engineering (BESE) Division, Jones, Burton, Fortunato, Luca, Farinha, Andreia S F |
| Source Sets | King Abdullah University of Science and Technology |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | 2024-05-16, At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis will become available to the public after the expiration of the embargo on 2024-05-16. |
| Relation | N/A |
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