1. Protect anion resin from biofouling
12.10.2006 | Rahman, S., Karnaphuli Fertilizer Co. Ltd., Chittagong, Bangladesh
Good treatment practices can prevent this serious problem
Keywords:
Ion exchange resin in water (H2O) treatment plants can experience resin fouling due to different contaminants
present in source H2O. Microbial nutrients that are available in resin beds, under favorable temperatures and idle
conditions, may allow microorganisms to grow. This can be eliminated with appropriate treatment and/or
prevention.
Biological fouling is less severe in cation resin than in anion. However, both resin types present the same
operational difficulties with regard to biofouling. As the bed's pressure drop increases, drastic flow reduction
occurs, making backwash operations difficult due to out-flowing debris. Bacteria proliferation to other ion
exchangers can also happen. During shutdown or standby operation modes, resin is kept in a regenerated
condition. Resin preservation procedures for long-term storage are available.1
Biologically fouled cation resin
debris may be washed with filtered H2O. Conversely, it is more difficult to clean debris from anion resin and, after
cleaning, bacterial activity may still be present in anion resins.
Control microbial growth in your cooling water
05.01.2004 | Rahman, S., Karnaphuli Fertilizer Co. Ltd., Chittagong, Bangladesh
Proper monitoring and chemical dosing can alleviate this challenge
Keywords:
The hydrocarbon processing industry (HPI) needs cooling water (CW) to operate efficiently and safely. Cooling
water may be in either a circulating or open tower. Circulating CW needs regular chemical dosing and monitoring
to maintain desired water conditions. System performance is dependent on several factors: the right chemical
type, sufficient dosing, makeup water quality, plant location and the beneficiary plant characteristics.
The CW system is subjected to severe stress due to plentiful nutrients for microbial growth and subsistence. This
is due to the facility being located in a tropical monsoon area. Apart from any other cooling tower, it is supplied
with very good water quality tapped from deep wells, thus ensuring stable inorganic water character and
eliminating water quality variance.
Prevent adsorber bed failure
09.01.2002 | Rahman, S., Karnaphuli Fertilizer Co. Ltd., Chittagong, Bangladesh
Improved operational integrity minimizes plant upsets and challenges
Keywords:
Many applications require water (H2O) and/or other chemical species to be at low to non-detectable (ND) levels in
a process gas stream. Moisture separation from several thousand parts per million (ppmV) to the quality desired
can be achieved by compressing, cooling and forcing the gas through a separation medium causing moisture or
other chemical components to separate from the gas flow. Each application is treated in a way that is suited to
the system's technical needs. Two commonly used mediums are molecular sieves (molsieves) and silica gel
(gel). Molsieves can be used to remove sulfur compounds, carbon dioxide (CO2), ammonia and H2O molecules.
Gel may be used to selectively adsorb H2O molecules, oxygen (O2), n-butane and other species.