12 May R6 Pipe Laterals for GAC Contactors
R6 Pipe Laterals for Sloped-Floor GAC Contactors
The use of post-filtration contactors containing granular activated carbon (or GAC) has steadily increased in drinking water treatment for several decades.
These contactors remove a variety of undesirable contaminants, to include algal toxins, taste and odor compounds, disinfection byproduct precursors, PFCs, pesticides, pharmaceuticals, organic compounds, and radon.
GAC adsorbs these compounds until its capacity is spent and must be replaced. This could be as frequent as every 6 to 12 months. For high flowrate applications, instead of numerous pressure vessels, large gravity contactors may be utilized. So how do you remove the spent media out of the large gravity contactor cells? Using a vacuum truck is straight-forward, but laborious.
Some contactors are built with sloped-floor bottoms to sluice the GAC towards a central flume for easier media removal. Pipe lateral type underdrains are required as common types of underdrains will not work because the floor is not level. Orthos’ R6 pipe laterals offer significant value over expensive-to-manufacture stainless wedgewire laterals.
Type R6 screens with 0.2mm slots are injection-molded of glass-reinforced polypropylene and are mounted on standard 6”-diameter 316 stainless steel pipe.
Orthos precision-drills each lateral with specifically-sized holes to provide proper distribution during contact flow and backwash. Laterals are provided with mounting hardware and connection flange.
The economy of the Orthos Type R6 over wedgewire allows more laterals to be used per basin to provide improved flow characteristics and media contact. This results in improved GAC utilization and longer bed life as well as improved backwash distribution, which will better clean the media and further increase its utilization.
These advantages clearly make Orthos Type R6 laterals an effective choice for sloped-floor GAC contactors.
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