ALAR Dissolved Air Flotation (DAF) Clarifier
Aug 02, 2016
The ALAR D.A.F. Clarifier is a wastewater clarification system that combines flotation and settling. This incorporates dissolved or inspirited air to aid in the flotation of fine solids, fats, oils, and grease. Its rectangular design uses less space, and the hopper shaped bottom facilities easy removal and high concentration of settleable solids. Sludge collectors, equally spaced on the traveling bridge, give complete coverage of the clarifier bottom. The bridge is also equipped with wiper blades that sweep the surface of the clarifier on each forward movement of the bridge. These wiper blades move the float to the incline plate and into the float discharge trough.
The Polymer Injection: (2 potential tanks)
Chemical separation is necessary (prior to the DAF) using a polymer. Polymer breaks apart the emulsified solids from the water and allows them to concentrate and float.
Flocculation or coagulation of solids is typically accomplished through the addition of cationic and/or anionic polymers; resulting easier solid flotation and less dissolved air usage. In many cases, the use of polymers promotes stronger floc formation, lower float volumes, and lower float moisture content.
In some cases additional polymer dosage is not necessary prior to a dewatering filter. Polymer enhances the filtration rates, provides higher quality effluent, and dryer solids. In the case of the Auto-Vac, it also conserves the use of diatomaceous earth (filter media).
The pH adjustment chemicals, coagulants, and polymers will impact the methods of disposal and/or utilization of the float generated by the DAF system. The moisture content and volume of material recovered by a DAF will vary and must be considered when sizing transfer pumps, storage tanks, and dewatering systems.
The tank size should be capable of holding 10% of the original gallons of sludge; and be agitated using a mixer (if going to dewatering filtration).
ALAR Auto-Vac Sludge Dewatering Filter:
The ALAR Auto-Vac is a rotary vacuum drum filter that effectively removes solid particles from the sludge, producing dewatered dry waste. Typically, this waste is disposed of at a local landfill without further drying. The Auto-Vac is self-cleaning with every revolution, which prevents blinding or clogging, and provides rapid filtration and extremely high filtrate clarity. The ALAR Aut0-Vac filtering system is skid mounted, pre-piped, pre-wired for easy installation. It is offered in both semi-automatic and automatic modes of operation. This design works incredibly well with DAF sludge applications.