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Sand Filter Activated Carbon (GAC)
FOR THE DESIGNERS
Filtration system suitable to break down the particles contained in wastewater and also for those smaller than 50μm in size.
The Biotec finishing system with granular activated carbon filters (GAC) consists of a column filter in PE-VTR with granular activated carbon (GAC) bed; it is controlled by a programmable electronic valve that lets you manage the backwash time and / or volume. Backwashing is made for the settlement of the filter bed to prevent the formation of "preferential" steps; filters GAC (Granular Activated Carbon) are usable to the point of exhaustion, so they need periodic replacement of the filtering material. Complete system of tank recovery (power) with submersible pump for constant feeding of the wastewater into the filter.
The Biotec GAC filters are particularly suitable for the removal of pollutants present in the water to be treated above.
The choice of the GAC filter is made according to the flow to be treated and the quantity of substances to be adsorbed, which will determine the duration of the activated carbon bed prior to the first replacement or regeneration. When used as a tertiary treatment at the exit of the purifier, for their sizing one can also use the theoretical users’ number column. The granular activated carbon filters should be used after an appropriate pre-treatment by sand filter or cartridge filters. Downstream of the Biotec finishing system with quartz sand one can foresee a storage tank with capacity as per table (accumulation). In case of rainwater also being collected, the storage volume can be chosen of greater capacity.
Applications and product selection
The remarkable ability of granular activated carbon (GAC) to absorb organic and inorganic compounds makes this type of equipment ideal to remove from wastewater the most common liquid and gaseous polluting compounds, such as:
• volatile organic compounds (VOCs) • halogenated compounds • chlorine • polychlorinated • pesticides • dioxins • asbestos • inorganic compounds
For the removal action of the compounds to be effective and efficient it is necessary that the wastewater input undergoes the abatement process of suspended solids, oils and greases. This can be achieved by use of degreasers, hydrocarbons separators, sand filters or cartridge filters. The retention capacity of hydrocarbons, oils and greases is indicatively 100 g / lt GAC, while the absorption of surfactants can reach values of up to 60 g / lt GAC.