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NORAM’s patented VERTAD™ system is a proprietary, auto-thermophilic aerobic sludge digestion process.

High on Environmental Friendliness
The low visual impact of VERTAD™, self-contained and largely hidden from view underground, gives it a significant advantage over the large surface tanks of a conventional plant. The subsurface and aerobic nature of the process provides a aesthetically pleasing and safe working environment with low maintenance requirements.

High on Land use Efficiency
VERTAD™ typically uses 10-20% of the total land required for conventional thermophilic digestion plants of equivalent capacity. This represents a considerable savings in capital cost while significantly reducing environmental impact.

High on Performance
The high oxygen transfer in VERTAD™ enables rapid digestion of mixed primary and secondary sludge. Class A Biosolids are produced in a substantially shorter time period than competing technologies.

The VERTAD™ process uses a submerged hyperbaric aeration system, which has been proven effective through more than 30 years of commercial operation in biological processes. The VERTAD™ patented design gives it the following advantages over conventional ATAD and anaerobic systems:

•  Class A Biosolids production in 4-days
   (40 CFR 503.32 Alternative.1)
•  Highly efficient oxygen transfer (> 50% OTE). With this
   low process air requirement, off-gas is minimized
•  Flotation thickening of VERTAD™ product to between
   8-12% using dissolved gases
•  Dewatering of thickened product to between 31- 34% with
   a low polymer requirement (14 lbs/ton)
•  Low operating cost due to low energy requirements
   (1.27 kW•hr/kg VS destroyed), low polymer demands
   (14 lbs/ton), and low trucking costs (> 30% TS cake)
•  Minimal footprint requirement – VERTAD™ is an ideal retrofit
   for current Class B Biosolids facilities