It can be concluded from the data presented herein, that in
desalination of brackish water, depending on its chemical
nature, antiscalants can enhance RO membrane biofouling in
several different ways at different stages of the biofilm growth.
Polyacrylate-based antiscalants were shown to enhance membrane
biofouling by altering the surface physico-chemical
properties of the membranes, which in turn promotes the
initial attachment and deposition of the bacterial cells.
Polyphosphonate-based antiscalants contribute to the membrane
biofouling by serving as sources of nutrients for the
bacterial cells. Comparing the two effects, the results in this
work showed that the former effect of the antiscalants causes more severe RO membrane
biofouling. It should be mentioned that a very severe membrane
biofouling might also result from coexistence of the two effects
with certain antiscalant or combination of two or more. Therefore,
even though antiscalants play significant roles in preventing
RO membrane scaling in brackish water desalination
processes, they can significantly contribute to the biofouling of
the RO membrane in several ways as illustrated in this study.
Hence, based on the findings of this work, we recommend that
antiscalants should be screened for their biofouling enhancement
potential in addition to their antiscaling activity, prior to
their use.
It can be concluded from the data presented herein, that indesalination of brackish water, depending on its chemicalnature, antiscalants can enhance RO membrane biofouling inseveral different ways at different stages of the biofilm growth.Polyacrylate-based antiscalants were shown to enhance membranebiofouling by altering the surface physico-chemicalproperties of the membranes, which in turn promotes theinitial attachment and deposition of the bacterial cells.Polyphosphonate-based antiscalants contribute to the membranebiofouling by serving as sources of nutrients for thebacterial cells. Comparing the two effects, the results in thiswork showed that the former effect of the antiscalants causes more severe RO membranebiofouling. It should be mentioned that a very severe membranebiofouling might also result from coexistence of the two effectswith certain antiscalant or combination of two or more. Therefore,even though antiscalants play significant roles in preventingRO membrane scaling in brackish water desalinationprocesses, they can significantly contribute to the biofouling ofthe RO membrane in several ways as illustrated in this study.Hence, based on the findings of this work, we recommend thatantiscalants should be screened for their biofouling enhancementpotential in addition to their antiscaling activity, prior totheir use.
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