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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Piloting Study on Biofouling Control of Reverse Osmosis System in Steel Mill Wastewater Reuse
Author(s)
Cheng Yang1, Tina Arrowood2 and Jon Johnson2
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DOI:10.17265/2162-5298/2017.09.003
Affiliation(s)
1. Dow Water and Process Solutions, The Dow Chemical (China) Investment Co., Ltd., Shanghai 201203, China
2. Dow Water and Process Solutions, The Dow Chemical Company, Minneapolis 55439, USA
ABSTRACT
The biofouling of RO (Reverse Osmosis)
system is one of the most common problems in highly contaminated
demineralization and wastewater reuse system. The biological fouling occurs due
to the bacteria growth and proliferation under nutritive environment, resulting
in a dramatic increase of dP (differential
pressure) in the RO system, which requires frequent system shutdown for
cleaning. This paper discusses the effectiveness of low-dP RO element and
periodic flushing on the biofouling scheme of industrial steel mill wastewater
reuse system. The low-dP RO element is able to provide low RO system dP, which is expressed
to be lower biofouling starting point during the industrial system operation.
However, the periodic flushing utilizes fresh water to remove the biofilm
deposit along with feed channel. The long term operation performance
demonstrated strong caustic is effective in removing the biofilm and recovering
RO system performance. It is experimentally validated that, in the case of a
high biofouling environment, low-dP RO element and periodic flushing is able to
extend the cleaning cycles by 36.6% and 11.4%, respectively. Meanwhile, a joint
application of both methods is proven to improve the biofouling control and
extend the cleaning cycle by 62.5%, as compared to standard RO technology.
KEYWORDS
RO (Reverse Osmosis), biofouling, membrane, dP (Differential Pressure), wastewater reuse.
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