Powdered activated carbon treatment
Powdered Activated Carbon Treatment (PACT) is a wastewater technology in which powdered activated carbon is added to an anaerobic or aerobic treatment system. The carbon in the biological treatment process acts as a "buffer" against the effects of toxic organics in the wastewater.
In such a system, biological treatment and carbon adsorption are combined into a single, synergistic treatment step. The result is a system which offers significant cost reduction compared to activated sludge and granular carbon treatment options. The addition of the powdered activated carbon stabilizes biological systems against upsets and shock loading, controls color and odor, and may reduce disposal costs while removing soluble organics.
Commercial Applications
The system as it exists today was developed in the 1970s under a collaborative effort between DuPont and Zimpro. PACT systems can be used to treat industrial wastewater, landfill leachate and highly contaminated surface water or groundwater.
In an aerobic treatment system, influent first enters an aeration tank where the powdered carbon is added, making up a portion of mixed liquor suspended solids. Once the is completed, the treated wastewater and the carbon-biomass slurry are allowed to settle.
Following treatment, a portion of the carbon and biomass slurry is wasted to solids handling. These solids can be wasted and disposed of as a slurry, dewatered to a compact, stable cake, or pumped as a slurry to a wet air oxidation unit for further processing to regenerate the carbon and destroy the biological solids.
Powered Activated Carbon (PAC) is also used extensively in municipal culinary water treatment to remove tastes and odors. It is very effective at removing naturally occurring earthy taste and odors caused from algae, such as geosmin.
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- Sludge Reduction: Technologies Integrated in the Waste Handling Units
- Rotating Biological Contactor
- Anaerobic Digestion
- Anaerobic Granular Sludge
- Anaerobic Biotechnologies
- Anaerobic Granular Sludge Bed Reactor Technologies
- The Dynamic Nature of a UASB Reactor
- Anaerobic Biodegradability
- Anaerobic Toxicity
Resources
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