Custom-designed ultrafilter designed to treat 150 gpm of municipal sewage plant effluent for re-use |
Wastewater
Recycle / Reclaim
Tower
Extrusions, a large aluminum extrusion company located in the drought-stricken
city of Olney, Texas, was under extreme pressure to reduce water consumption.
The city was experiencing water shortages, with reservoir levels declining by
over 90%. Tower Extrusions is one of the city’s largest consumers of fresh
water. The owner of the company, a long-time Olney resident, wanted to do what
he could to help reduce his company’s water use.
WaterProfessionals®
learned that the environmentally-conscious owner had already attempted to reuse
effluent from the city’s sewage treatment plant, rather than drawing fresh
water from the limited water reservoir. Tower Exclusions had previously
installed a conventional media filtration system and attempted to filter the
wastewater themselves.
Unfortunately,
wastewater recycling efforts did not prove fruitful, as contaminants in the
city’s effluent water quickly fouled the filter media, leaving the water dirty
and unfit for use.
Tower Exclusions asked WaterProfessionals® to assist in the
development of a wastewater recycling system that would allow them to effectively
treat the city’s effluent water and reuse it as rinse water and makeup water.
WaterProfessionals®
consulted with the President of the company, offering ideas for wastewater
recycling and conservation. The company required two different qualities of
water for plant operation:
1) a low particulate water that was safe to use for
general cleaning and rinsing applications; and
2) water low in dissolved solids
for use as final rinse water and makeup water.
WaterProfessionals®
collected samples of treated water from the city’s sewage treatment plant
effluent and began designing and engineering a water treatment system that
would filter the municipal wastewater to meet the company’s needs.
A custom
water treatment solution was developed that utilizes ultrafiltration as
pretreatment to reverse osmosis technology. Combined, the systems are able to
remove particulate, bacteriological, virus, cyst and dissolved solid
contaminants from the sewage plant discharge.
Ultrafiltration
was used to filter the water for general use purposes followed by reverse
osmosis to treat water used for final rinsing and as makeup water. The
integrated, highly automated, PLC- controlled ultrafilter and reverse osmosis
systems were engineered, designed and constructed by WaterProfessionals®.
The
ultrafilter is capable of producing 125,000 gallons of filtered water per day.
The filtered water is stored in one of two 20,000 gallon storage tanks until
required for general plant use or pumped to the reverse osmosis machine for
further filtration. The reverse osmosis machine is capable of filtering 72,000
gallons of water per day, with a 95-98% reduction in dissolved solids.
To
prevent fouling, the ultrafiltration system utilizes a PLC-controlled backwash
cycle that incorporates air scour to remove foulants from membrane fibers. The
system also includes PLC-controlled, automated chemical maintenance cleanings,
as well as chemical recovery cleanings. The entire system is highly automated.
The
custom designed water treatment system by WaterProfessionals® will save up to
45-million gallons of water per year by recycling wastewater from the municipal
sewage plant, rather than pulling water from an already strained reservoir.
This system has removed the threat of the plant closing due to severe, sustained
drought.
http://www.waterprofessionals.com/case_studies/wastewater/wastewater-recycle-reclaim.html
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http://www.waterprofessionals.com/case_studies/wastewater/wastewater-recycle-reclaim.html
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