Increased Capacity
The flexible, high-surface-area media, supported in structural frames, is submerged in the activated sludge tanks to provide extensive surface area for biomass growth. The attached biomass population can increase the effective MLSS concentration by over 2000 mg/l, increasing organic load capacity. This also reduces F/M ratios, improving process control and stability

Higher MLSS Without Higher Clarifier Solids Loading
Because a significant portion of the active biomass remains attached to the AccuWeb fabric rather than suspended in the mixed liquor, organic removal increases without overloading secondary clarifiers with higher solids loads. For activated sludge systems with clarifier solids loading problems, treatment performance can be maintained or even improved while reducing MLSS loading to the secondary clarifier.

Resistant to Organic and Hydraulic Shock Loads
An “Achilles Heel” of activated sludge technology is the potential for peak hydraulic surges to “wash out” the suspended biomass from the aeration basins. With AccuWeb, a significant amount of biomass is fixed in place and is available to treat the incoming organic load that accompanies hydraulic surges

Enhanced Nitrification
The biomass living on the AccuWeb media increases MCRT (Sludge Age), promoting nitrification. During cold weather and where lower compliance limits are imposed, the added biomass improves the performance of nitrifying plants, or even allows non-nitrifying plants to nitrify.

Active Media Surface
AccuWeb fabric has a tensile strength in excess of 1000 lbs. per lineal foot, yet is flexible enough to move like “reeds in a stream.” This movement creates localized turbulence that constantly renews surface areas and promotes oxygen transfer. Each loop fiber in the AccuWeb media is 1/16” in diameter and is made up of about 200 individual filaments, each thinner than a human hair.

The total surface area available for biomass attachment at startup is up to 800 sq. ft. per cubic foot of installed media module. However, dry surface area (fig. 1) does not tell the whole story. From those 800 sq. ft. of attachment points, the biomass grows underwater in 3 dimensions (fig. 3), creating flexible “branches” of non-blinding active surface area that can be measured in pounds per cubic foot, while still allowing for free flow of oxygenated wastewater through the media.

Economical
By improving wastewater treatment without adding aeration tankage or clarifiers, the AccuWeb Frame system is a low-cost solution to upgrading activated sludge plants.

Easy to Install
The entire AccuWeb Frame system can be installed without dewatering the aeration basin or modifying the aeration diffusers. The custom-sized/constructed AccuWeb Frame modules, made of polyester fabric attached to frames of stainless steel, aluminum, or fiberglass are lowered into the aeration basin with a crane and supported by the tank walls or on legs above the tank floor.

Durable and Long-Lasting
AccuWeb Frame is designed for durability and long life under the harsh conditions of an activated sludge aeration tank. The AccuWeb fabric uses high-strength polyester yarns in a proprietary lock-knit manufacturing process that fuses a knit backing and a high loop face. Even if a strand is cut or broken, the fabric will not fray or unravel.