PuraSAF wastewater treatment system

Overview

The PuraSAF® submerged aerated filter wastewater treatment system 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 process uses the media to provide superior oxygen transfer rates providing a very low operating cost solution.

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 head loss solution for BOD, and nitrification, and in an unaerated mode as an anoxic stage for denitrification or as a low-cost tertiary solids filter that approaches sand filter quality.

The process can be designed for a number of wastewater treatment applications including as a secondary wastewater treatment unit, for tertiary wastewater treatment reducing ammonia on existing works or lagoon effluent, as a temporary measure while an existing asset is being refurbished or replaced; as an emergency wastewater treatment stage on a failing works; to handle seasonal peak loads and in an unaerated mode as a low cost solids tertiary filter or as a denitrification filter.

PuraSAF is available as a mobile rental or lease unit. PuraSAF can be installed as a pre-engineered package system or designed in concrete tanks.

International Patent Application WO2007/042836 A1

How it works

1. Specially designed, recycled plastic media act as biomass carriers and provide a large surface area for bacteria to attach. 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.
2. The filter media will 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” and scouring of the media bed. Agitation dislodges unwanted particulate matter without unduly disturbing the active biomass.
3. Once the scour is switched off, the filter bed will reform and biological treatment recommences immediately. Excess solids in the form of sludge are drained from the base of the tank via an actuated desludge valve. The cleaning process is fully automated via the control panel and blower skid configuration.

Features & benefits

Brochures & documentation

Download our product overview, engineering and technical specifications:

• PuraSAF Overview and Technical Specifications