PuraSAF Submerged Aerated Filter SAF for Wastewater Treatment
Bord na Móna Environmental Products U.S. Inc. today announced the market introduction of its new PuraSAF® Submerged Aerated Filter wastewater treatment solution .
According to Shane Keaney, President of Bord na Móna Environmental Products U.S. Inc., PuraSAF provides a cost effective, low energy, pre-engineered wastewater treatment solution that is simple to operate and maintain. The filter media are produced from recycled plastic that provide an ideal medium for biological attached growth. The filter normally operates in an upflow packed bed configuration that is readily fluidized for cleaning and desludging. In aerobic mode, PuraSAF offers a small footprint, low headloss solution for BOD, and Nitrification. The PuraSAF can also be used in an unaerated mode as an anoxic stage for denitrification or as a low-cost tertiary filter approaching sand filter quality.
“PuraSAF is available as mobile rental or lease units. It can be installed as a pre-engineered package system that provides effluent to secondary treatment standards, for tertiary treatment reducing ammonia on existing works or lagoon effluent, as a temporary measure while an existing asset is being refurbished or replaced; it can be used as an emergency treatment stage to provide treatment on a failing works; it can be brought on site to handle seasonal peak loads and in an unaerated mode it is a low cost solids tertiary filter or can be used for denitrification,”
The PuraSAF tank is equipped with a rugged, coarse-bubble aeration system that utilizes the media to provide superior oxygen transfer rates, more efficient than fine bubble systems. This allows the PuraSAF to have a much smaller footprint and better oxygen transfer efficiency than traditional activated-sludge processes, saving capital and operating costs through lower process air requirements.
Specially designed, recycled plastic media act as biomass carriers and provide a large surface area for bacteria to attach. The filter media require periodic, typically daily cleaning to remove excess biomass and accumulated solids. Cleaning is achieved by increasing the air rate into the reactor using the scour grid, which results in a “fluidization”
The PuraSAF effluent can readily meet performance levels of up to: BOD 25mg/l, SS 35 mg/l for secondary treatment applications. In tertiary mode the PuraSAF can achieve discharge permit levels of
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