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http://dx.doi.org/10.12989/mwt.2019.10.5.321

Membrane distillation of power plant cooling tower blowdown water  

Ince, Elif (Gebze Technical University, Department of Environmental Engineering)
Uslu, Yasin Abdullah (Gebze Technical University, Department of Environmental Engineering)
Publication Information
Membrane and Water Treatment / v.10, no.5, 2019 , pp. 321-330 More about this Journal
Abstract
The objective of this study was to examine the recovery of the power plant cooling tower blowdown water (CTBD) by membrane distillation. The experiments were carried out using a flat plate poly vinylidene fluoride (PVDF) membrane with a pore diameter of $0.22{\mu}m$ by a direct contact membrane distillation unit (DCMD). The effects of operating parameters such as transmembrane temperature difference (${\Delta}T$), circulation rate and operating time on permeate flux and membrane fouling have been investigated. The results indicated that permeate flux increased with increasing ${\Delta}T$ and circulation rate. Whereas maximum permeate flux was determined as $47.4L/m^2{\cdot}h$ at ${\Delta}T$ of $50^{\circ}C$ for all short term experiments, minimum permeate flux was determined as $7.7L/m^2{\cdot}h$ at ${\Delta}T$ of $20^{\circ}C$. While $40^{\circ}C$ was determined as the optimum ${\Delta}T$ in long term experiments. Inorganic and non-volatile substances caused fouling in the membranes.
Keywords
power plant; cooling tower blowdown water; membrane distillation; flux; circulation rate; transmembrane temperature difference;
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