Analysis of membrane distillation crystallization system for high salinity brine treatment with zero discharge using Aspen flowsheet simulation
An environmentally friendly membrane distillation crystallization (MDC) system is proposed to treat high salinity reverse osmosis (RO) brine with zero discharge. The raw brine from RO desalination plants is concentrated in direct contact MD to produce pure water, and the concentrate is then crysta...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/100769 http://hdl.handle.net/10220/10041 |
| Summary: | An environmentally friendly membrane distillation crystallization (MDC) system is proposed to treat high salinity
reverse osmosis (RO) brine with zero discharge. The raw brine from RO desalination plants is concentrated in direct contact MD
to produce pure water, and the concentrate is then crystallized to produce solid salts without secondary disposal. A
comprehensive analysis on the MDC system has been performed by Aspen flowsheet simulation with a user customized MD
model, which was verified by our previous experiments. Simulation results reveal that the total energy consumption is negligibly
changed by integration of a crystallization unit into the system, as over 97.8% of the energy was consumed by the heater of the
MD subsystem. Higher inlet temperatures of both the feed and permeate streams in the MD module can improve the thermal
efficiency. The introduction of a heat recovery unit in the MDC system, to recover the heat in the permeate for feed preheating,
can increase the gain output ratio (GOR) by 28%. Moreover, it is shown that in a hollow fiber MD module, the permeate yield is
a linear function of the length-to-radius ratio of the membrane module, and a longer MD module can reduce the specific energy
consumption. A relatively high feed flow rate is preferred to avoid the potential problem of crystal blockage in the MD module. |
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