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Biological approach to improving the evaporation rates of mine wastewater desalination brine treated in evaporation pondsMoyo, Anesu Conrad January 2021 (has links)
Philosophiae Doctor - PhD / The disposal of brine effluent from inland wastewater desalination plants is a
growing global problem with adverse economic and environmental implications
because of the substantial cost associated with its disposal and the potential for
polluting groundwater resources. Currently, the best and most economical option
for brine disposal from inland desalination plants is the use of evaporation ponds,
which concentrate the liquid until getting a solid waste that can be valued or
directly managed by an authorized company. The effectiveness of these ponds is
therefore dependent on the evaporation rate, which has previously been improved
by the addition of dyes such as methylene blue. However, the addition of chemical
dyes to the evaporation ponds poses a threat to the environment, wildlife, and
humans.
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Improving Evaporation Rate of Mine WastewaterKhumalo, Londiwe Thandeka Precious January 2018 (has links)
Magister Scientiae - MSc (Biotechnology) / The treatment of mine water at the eMalahleni Water Reclamation Plant (EWRP) results in the
production of large volumes of brine. Different brine management methods have been applied
to dispose the brine but the evaporation pond method is regarded as the cheaper, most effective
and less laborious method for brine disposal. Brine wastewater is pumped into the pond where
it evaporates resulting in the mixture of salts. The rate at which evaporation occurs is influenced
by many factors such as temperature, salinity, humidity and wind. Due to high salinities in
brine the EWRP is currently experiencing a challenge with low evaporation rate. Here, a
comparative study was done to determine the efficiency of using a chemical and a biological
approach to enhance the evaporation rate of reject brine. The chemical approach involved the
addition of various concentrations of methylene blue dye (100 to 300 ppm with 50 ppm
increments) to 1L volumes of brine, and measuring the evaporation rate. On the other hand, the
biological approach involved the isolation of pigmented halophilic bacteria from eMalahleni
brine and Cerebos salt samples. Isolated bacterial strains were characterised based on their
morphology, biochemical and salt tolerance characteristics. Furthermore, the strains were
identified using 16S rRNA gene sequence analysis. Among the isolated halophilic bacterial
strains, EP-3, an Arthobacter agilis isolated from the eMalahleni brine produced a darker
pigment compared to the other strains. Therefore, EP-3 was evaluated for its effect on the
evaporation of brine using a culture inoculum or the addition pigment extracted from an EP-3
culture. The addition of MB above 100 ppm overcame the effect of salt precipitation and
resulted in higher evaporation (41%) rate. Addition of pigmented bacteria or bacterial extracted
pigment to the brine respectively resulted in 18% and 24% increase in the evaporation rate.
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Modeling of Evaporative Losses in Industrial PasteurizationCiccone, Brianne N. 26 June 2012 (has links)
No description available.
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